阅读说明：本技术 全向轮 (Omnidirectional wheel ) 是由 杉本俊太郎 坂东一夫 中川智之 于 2020-10-23 设计创作，主要内容包括：全向轮(1)具备：旋转部(30),外周面由多个辊(40、50)形成,围绕旋转轴线旋转；多个支承部(60),沿着旋转部(30)的周向排列且分别安装于旋转部(30),将辊(40、50)支承于旋转部(30)。辊(40、50)包括多个第一辊(40)和多个第二辊(50),第一辊(40)与第二辊(50)沿着周向交替排列,各支承部(60)具有：第一臂(70),支承多个第一辊(40)中的对应的对应第一辊(40)的轴向一端侧；第二臂(80),支承对应第一辊(40)的轴向另一端侧。由沿着周向相邻的两个支承部(60)中的一方的第一臂(70)和另一方的第二臂(80)支承多个第二辊(50)中的对应的对应第二辊(50)。(An omnidirectional wheel (1) is provided with: a rotating section (30) having an outer peripheral surface formed by a plurality of rollers (40, 50) and rotating around a rotation axis; and a plurality of support sections (60) which are arranged along the circumferential direction of the rotating section (30), are attached to the rotating section (30), and support the rollers (40, 50) on the rotating section (30). The rollers (40, 50) include a plurality of first rollers (40) and a plurality of second rollers (50), the first rollers (40) and the second rollers (50) are alternately arranged along the circumferential direction, and each support portion (60) has: a first arm (70) that supports one axial end side of a corresponding first roller (40) of the plurality of first rollers (40); and a second arm (80) which supports the other end side in the axial direction of the corresponding first roller (40). A corresponding second roller (50) of the plurality of second rollers (50) is supported by one first arm (70) and the other second arm (80) of two support portions (60) adjacent to each other in the circumferential direction.)

1. An omni wheel whose outer peripheral surface is formed of a plurality of rollers and which is rotatable about an axle rotation axis, wherein,

the omni wheel includes:

a rotating portion that rotates about the axle rotation axis; and

a plurality of support portions arranged along a circumferential direction of the rotating portion, each of the support portions being attached to the rotating portion and supporting the plurality of rollers on the rotating portion,

the plurality of rollers includes a plurality of first rollers and a plurality of second rollers having an outer diameter different from an outer diameter of the first rollers,

the first rollers and the second rollers are alternately arranged along the circumferential direction,

each of the support portions has a first arm member that supports one end side in an axial direction of a corresponding one of the plurality of first rollers, and a second arm member that supports the other end side in the axial direction of the corresponding first roller,

the first arm member of one of the two support portions adjacent in the circumferential direction and the second arm member of the other support portion support a corresponding second roller of the plurality of second rollers.

2. The omni wheel of claim 1,

one end side of the first arm member in the axial direction of the first roller is supported by one end side of the first arm member, and the other end side of the first arm member is attached to the rotating portion,

the second arm member has one end side supporting the other end side of the corresponding first roller in the axial direction, and the other end side of the second arm member is attached to the rotating portion.

3. Omnidirectional wheel according to claim 1 or 2,

one end side in the axial direction and the other end side in the axial direction of the corresponding first roller are fixed to the first arm member and the second arm member by one fastening member extending in the axial direction of the corresponding first roller.

4. Omnidirectional wheel according to any of claims 1 to 3,

the second corresponding roller is fixed to the first arm member and the second arm member by one fastening member extending in an axial direction of the second corresponding roller.

5. Omnidirectional wheel according to any of claims 1 to 4,

the first roll is a small-diameter roll, and the second roll is a large-diameter roll having an outer diameter larger than that of the first roll.

6. The omni wheel of claim 5,

in the first arm member, a large-diameter roller support portion that supports the corresponding second roller is disposed further toward a radial direction inner side of the rotating portion than a small-diameter roller support portion that supports one end side of the first roller in the axial direction,

the first arm member has a connecting portion that connects the large-diameter roller support portion and the small-diameter roller support portion,

the connecting portion extends mainly in a direction in which the rotational axis of the corresponding second roller extends, as viewed from a direction in which the axle rotational axis extends.

7. The omni wheel of claim 6,

in the second arm member, a large-diameter roller support portion that supports the corresponding second roller is disposed further inward in the radial direction than a small-diameter roller support portion that supports the other end side in the axial direction of the first roller,

the second arm member has a connecting portion that connects the large-diameter roller support portion and the small-diameter roller support portion,

the connecting portion of the second arm member extends mainly in a direction in which the rotational axis of the corresponding second roller extends, as viewed from a direction in which the axle rotational axis extends.

8. The omni wheel of claim 6,

the direction in which the connecting portion of the first arm member extends and the direction in which the rotation axis of the corresponding second roller extends form an angle of 20 ° or less.

9. The omni wheel of claim 2,

the other end side of the first arm member and the other end side of the second arm member overlap in a predetermined direction along the axle rotation axis.

10. The omni wheel of claim 9,

a first attached portion to be attached to the rotating portion is formed on the other end side of the first arm member,

a second attached portion to be attached to the rotating portion is formed on the other end side of the second arm member,

the first attached portion is formed at a position shifted in one of the predetermined directions with respect to a center of the first arm member in a direction along the axle rotation axis,

the second attached portion is formed at a position offset to the other side in the predetermined direction with respect to a center of the second arm member in the direction along the axle rotation axis.

11. Omnidirectional wheel according to any of claims 1 to 10,

at least one of the plurality of rollers is formed with a hole extending from an outer circumferential surface to an inner circumferential surface of the roller.

12. The omni wheel of claim 11,

the hole is closed by a plug member for closing the hole.

13. Omnidirectional wheel according to claim 11 or 12, wherein,

the at least one roller is the corresponding first roller,

one end side in the axial direction and the other end side in the axial direction of the corresponding first roller are attached to the support portion by one bolt extending in the axial direction of the corresponding first roller,

an engaging portion is formed at an axial position of the outer peripheral surface of the bolt corresponding to the hole.

14. The omni wheel of claim 13,

in the outer peripheral surface of the bolt, a first flat surface portion, a second flat surface portion, and a curved surface portion that connects the first flat surface portion and the second flat surface portion are formed as the engagement portion, the second flat surface portion and the first flat surface portion being different in position in the circumferential direction of the outer peripheral surface of the bolt.

15. Omnidirectional wheel according to claim 11 or 12, wherein,

the at least one roller is the corresponding first roller,

one end side in the axial direction and the other end side in the axial direction of the corresponding first roller are attached to the support portion by one bolt extending in the axial direction of the corresponding first roller,

the hole is a hole to which a screw member can be screwed,

an engagement portion that engages with the screw member is formed at an axial position of the bolt corresponding to the hole.

16. Omnidirectional wheel according to any of claims 5 to 10,

a part of one end side of the corresponding first roller in the axial direction is disposed in a recess formed in an end portion of the corresponding second roller in the axial direction.

17. An omni wheel whose outer peripheral surface is formed of a plurality of rollers and rotates about an axle rotation axis, wherein,

the omni wheel includes:

a rotating portion that rotates about the axle rotation axis; and

a plurality of support portions arranged along a circumferential direction of the rotating portion, each of the support portions being attached to the rotating portion and supporting the plurality of rollers on the rotating portion,

the plurality of rolls include a plurality of small-diameter rolls and a plurality of large-diameter rolls, the outer diameter of the large-diameter rolls is larger than the outer diameter of the small-diameter rolls,

the small-diameter rollers and the large-diameter rollers are alternately arranged along the circumferential direction,

each of the support portions has a first arm that supports one end side in an axial direction of a corresponding one of the small-diameter rollers, and a second arm that supports the other end side in the axial direction of the corresponding small-diameter roller,

wherein the first arm of one of the two support portions adjacent in the circumferential direction and the second arm of the other support portion support a corresponding large-diameter roller of the plurality of large-diameter rollers,

in the first arm, a large-diameter roller support portion that supports the corresponding large-diameter roller is disposed further toward the inside in the radial direction of the rotating portion than a small-diameter roller support portion that supports one end side in the axial direction of the small-diameter roller,

the first arm has a connecting portion that connects the large-diameter roller support portion and the small-diameter roller support portion,

the connecting portion extends mainly in a direction in which the rotation axis of the corresponding large-diameter roller extends, as viewed from a direction in which the axle rotation axis extends.

18. The omni wheel of claim 17,

in the second arm, a large-diameter roller support portion that supports the corresponding large-diameter roller is disposed further inward in the radial direction than a small-diameter roller support portion that supports the other end side of the small-diameter roller in the axial direction,

the second arm has a connecting portion connecting the large-diameter roller support portion and the small-diameter roller support portion,

the connecting portion of the second arm extends mainly in a direction in which the rotation axis of the corresponding large-diameter roller extends, as viewed from a direction in which the axle rotation axis extends.

19. An omni wheel whose outer peripheral surface is formed of a plurality of rollers and rotates about an axle rotation axis, wherein,

the omni wheel includes:

a rotating portion that rotates about the axle rotation axis; and

a plurality of support portions arranged along a circumferential direction of the rotating portion, each of the support portions being attached to the rotating portion and supporting the plurality of rollers on the rotating portion,

the plurality of rolls include a plurality of small-diameter rolls and a plurality of large-diameter rolls, the outer diameter of the large-diameter rolls is larger than the outer diameter of the small-diameter rolls,

the small-diameter rollers and the large-diameter rollers are alternately arranged along the circumferential direction,

each of the support portions has a first arm that supports one end side in an axial direction of a corresponding one of the small-diameter rollers, and a second arm that supports the other end side in the axial direction of the corresponding small-diameter roller,

wherein the first arm of one of the two support portions adjacent in the circumferential direction and the second arm of the other support portion support a corresponding large-diameter roller of the plurality of large-diameter rollers,

in the first arm, a large-diameter roller support portion that supports the corresponding large-diameter roller is disposed further toward a radial direction inside the rotating portion than a small-diameter roller support portion that supports one end side of the corresponding small-diameter roller in the axial direction,

the first arm has a base end side portion that extends mainly in the axial direction of the corresponding small-diameter roller,

the base end side portion connects an attached portion attached to the rotating portion and the large-diameter roller supporting portion,

a part of the inner surface of the base end side portion in the radial direction faces the inner circumferential surface of the corresponding large-diameter roller,

a central portion in a wheel width direction of the portion of the inner side surface bulges inward in the radial direction,

the distance between the part of the inner surface and the inner circumferential surface of the corresponding large-diameter roller is 2mm or less.

20. The omni wheel of claim 19,

the large diameter roller support portion side of the base end portion is disposed in a recess formed in an end portion of the corresponding large diameter roller,

the weakest portion of the base end portion is disposed in the recess.

Technical Field

The invention relates to an omni wheel.

Background

As such an omni wheel, there is known an omni wheel including: a drive shaft; a disk-shaped member rotatably supported by the drive shaft; a plurality of support members attached to an outer peripheral portion of the disc-shaped member at intervals in a circumferential direction; small-diameter rollers rotatably supported by the plurality of support members; and a plurality of large-diameter rollers supported by two support members adjacent to each other in the circumferential direction. For example, patent document 1 discloses such an omni wheel.

Patent document 1: japanese patent No. 3421290

The outer circumferential surface of the omni wheel is formed of a plurality of rollers. Therefore, it is difficult to achieve both firm support of each roller and weight reduction of the omni wheel at a high level. For example, when an omni wheel is used in an electric mobile device on which one person sits and rides, each roller may receive a force of 300N or more, and each roller may receive a force of 500N or more. In addition, such motorized mobile devices are used for long periods of time daily. Therefore, if the support member is weak as shown in patent document 1, the support position of each roller changes, and each support member is deformed or broken, so that the performance of the omni wheel is significantly reduced.

Disclosure of Invention

In view of the above, an omni wheel capable of simultaneously achieving an increase in the force received by each roller and a reduction in weight at a high level is desired.

According to a first aspect of the present invention, there is provided an omni wheel having an outer circumferential surface formed of a plurality of rollers and rotatable about an axle rotation axis, the omni wheel comprising: a rotating portion that rotates about the axle rotation axis; and a plurality of support portions that are arranged along a circumferential direction of the rotating portion, are attached to the rotating portion, respectively, and support the plurality of rollers on the rotating portion, wherein the plurality of rollers include a plurality of first rollers and a plurality of second rollers, the second rollers have outer diameters different from the outer diameters of the first rollers, the first rollers and the second rollers are alternately arranged along the circumferential direction, each of the support portions includes a first arm member that supports one end side in an axial direction of a corresponding first roller of the plurality of first rollers, and a second arm member that supports the other end side in the axial direction of the corresponding first roller, and the corresponding second roller of the plurality of second rollers is supported by the first arm member of one of the two support portions adjacent to each other in the circumferential direction and the second arm member of the other support portion.

According to a second aspect of the present invention, there is provided an omni wheel having an outer peripheral surface formed by a plurality of rollers and rotating around an axle rotation axis, comprising: a rotating portion that rotates about the axle rotation axis; and a plurality of support portions that are arranged along a circumferential direction of the rotating portion, are attached to the rotating portion, respectively, and support the plurality of rollers on the rotating portion, wherein the plurality of rollers include a plurality of small-diameter rollers and a plurality of large-diameter rollers, an outer diameter of the large-diameter roller is larger than an outer diameter of the small-diameter roller, the small-diameter rollers and the large-diameter rollers are alternately arranged along the circumferential direction, each of the support portions has a first arm that supports one end side in an axial direction of a corresponding small-diameter roller among the plurality of small-diameter rollers, and a second arm that supports the other end side in the axial direction of the corresponding small-diameter roller, the first arm supports the corresponding large-diameter roller among the plurality of large-diameter rollers by the first arm of one of the two support portions adjacent in the circumferential direction and the second arm of the other of the two support portions, and the large-diameter roller support portion that supports the corresponding large-diameter roller is further from the small-diameter roller that supports the one end side in the axial direction of the roller among the first arm The first arm has a connecting portion that connects the large-diameter roller support portion and the small-diameter roller support portion, and the connecting portion extends mainly in a direction in which the rotation axis of the corresponding large-diameter roller extends when viewed from a direction in which the rotation axis of the axle extends.

According to a third aspect of the present invention, there is provided an omni wheel having an outer peripheral surface formed by a plurality of rollers and rotating around an axle rotation axis, comprising: a rotating portion that rotates about the axle rotation axis; and a plurality of support portions that are arranged along a circumferential direction of the rotating portion, are attached to the rotating portion, respectively, and support the plurality of rollers on the rotating portion, wherein the plurality of rollers include a plurality of small-diameter rollers and a plurality of large-diameter rollers, an outer diameter of the large-diameter rollers is larger than an outer diameter of the small-diameter rollers, the small-diameter rollers and the large-diameter rollers are alternately arranged along the circumferential direction, each of the support portions has a first arm that supports one axial end side of a corresponding small-diameter roller of the plurality of small-diameter rollers, and a second arm that supports the other axial end side of the corresponding small-diameter roller, and supports the corresponding large-diameter roller of the plurality of large-diameter rollers by the first arm of one of the two support portions adjacent in the circumferential direction and the second arm of the other of the two support portions, and a large-diameter roller support portion that supports the corresponding large-diameter roller of the first arm is located closer to the small-diameter roller support portion that supports the one axial end side of the corresponding small-diameter roller The first arm has a base end side portion extending mainly in the axial direction of the corresponding small-diameter roller, the base end side portion connects a mounted portion mounted to the rotating portion and the large-diameter roller support portion, a portion of the radial inner side surface of the base end side portion faces an inner peripheral surface of the corresponding large-diameter roller, a central portion in a wheel width direction of the portion of the inner side surface bulges out to the radial inner side, and a distance between the portion of the inner side surface and the inner peripheral surface of the corresponding large-diameter roller is 2mm or less.

Drawings

Fig. 1 is a sectional view of an omni wheel according to a first embodiment of the present invention.

Fig. 2 is a perspective view of the omni wheel of the first embodiment.

Fig. 3 is a perspective view of the omni wheel according to the first embodiment in a state in which a part of the rollers are removed.

Fig. 4 is a partially sectional perspective view of the omni wheel of the first embodiment.

Fig. 5 is a perspective view of the electromotive mobile device using the omni wheels of the first embodiment.

Fig. 6 is a schematic view of the bottom surface of the electromotive mobile device using the omni-wheel of the first embodiment.

Fig. 7 is a perspective view of a support portion used in the omni wheel of the first embodiment.

Fig. 8 is a perspective view of a first arm member used in the omni wheel of the first embodiment.

Fig. 9 is a front view of a first arm member and a second arm member used in the omni wheel of the first embodiment.

Fig. 10 is a top view of a first arm member and a second arm member used in the omni wheel of the first embodiment.

Fig. 11 is a cross-sectional view of the omni wheel of the first embodiment.

Fig. 12 is a sectional view taken along line XII-XII in fig. 1.

Fig. 13 is a sectional view of an omni wheel according to a first modification of the first embodiment.

Fig. 14 is a sectional view of an omni wheel according to a second modification of the first embodiment.

Fig. 15 is a sectional view of an omni wheel according to a third modification of the first embodiment.

Fig. 16 is a sectional view of an omni wheel according to a fourth modification of the first embodiment.

Fig. 17 is a sectional view of an omni wheel according to a second embodiment of the present invention.

Fig. 18 is a sectional view showing a first modification of the above embodiment.

Fig. 19 is a partially sectional perspective view showing a second modification of the above embodiment.

Fig. 20 is a perspective view showing a third modification of the above embodiment.

Fig. 21 is a perspective view of a first arm member and a second arm member according to a third modification of the embodiment.

Fig. 22 is a sectional view taken along line XXII-XXII in fig. 1.

Detailed Description

An omni wheel 1 according to a first embodiment of the present invention will be described with reference to the accompanying drawings.

As shown in fig. 4 and 6, the omni wheel 1 includes a pair of hub members 20 and 30 supported on an axle 10 via a pair of bearings 10a in the width direction. Therefore, the hub members 20 and 30 function as rotating portions that rotate around the rotation axis RL.

As shown in fig. 1, 2, 4, and the like, the outer peripheral surface of the omni wheel 1 is formed by a plurality of small-diameter rollers (first rollers) 40 and a plurality of large-diameter rollers (second rollers) 50, and the plurality of rollers 40 and 50 are supported by a plurality of support portions 60. The large-diameter rollers 50 have an outer diameter larger than that of the small-diameter rollers 40, and the large-diameter rollers 50 and the small-diameter rollers 40 are alternately arranged in the circumferential direction of the hub members 20 and 30. The support portions 60 are attached to the hub members 20 and 30 by bolts (fastening members) B, respectively.

In the present embodiment, the boss members 20 and 30 are formed by punching a metal plate-like member. Instead of the hub members 20 and 30, a disk-shaped block made of aluminum or the like may be used. In this case, the block functions as a rotating portion that rotates about the rotation axis RL, and the plurality of support portions 60 are attached to the outer peripheral side of the block by bolts (fastening members) B, respectively. Instead of the bolts, rivets (fastening members) may be used, shafts (fastening members) fixed to the hub members 20 and 30 by welding may be used, and other known fastening members may be used.

As shown in fig. 1, each small-diameter roller 40 includes a substantially cylindrical core member 41, an outer peripheral member 42 bonded to an outer peripheral surface of the core member 41, and a shaft 43 disposed in a hole 41a formed in the core member 41. The hole 41a extends in the axial direction of the small-diameter roller 40. The core member 41 may be made of metal such as aluminum or iron, or may be made of plastic. In the present embodiment, the outer peripheral member 42 is formed of a material having rubber-like elasticity such as rubber or silicon, and is bonded to the outer peripheral surface of the core member 41 by vulcanization in one example.

The shaft 43 is made of metal such as iron or aluminum. Since core member 41 is supported by shaft 43 via bearing 44, core member 41 can rotate about rotation axis RL with respect to shaft 43. A step against which the bearing 44 abuts is formed on the inner peripheral surface of the hole 41a of the core member 41, and a step against which the bearing 44 abuts is also formed on the outer peripheral surface of the shaft 43. A sleeve may be disposed on the outer peripheral surface of the shaft 43, and the bearing 44 may be in contact with the sleeve.

As shown in fig. 1, each large-diameter roller 50 includes: a core member 51 having a substantially cylindrical outer peripheral portion 51 b; an outer peripheral member 52 bonded to the outer peripheral surface of the outer peripheral portion 51 b; and a shaft 53 disposed in a hole 51a formed in the core member 51. The holes 51a extend in the axial direction of the large-diameter roller 50. The core member 41 may be made of metal such as aluminum or iron, or may be made of plastic. In the present embodiment, the outer peripheral member 52 is formed of a material having rubber-like elasticity such as rubber or silicon, and is bonded to the outer peripheral surface of the outer peripheral portion 51b of the core member 51 by vulcanization in one example.

In the present embodiment, the core member 51 has an outer peripheral portion 51b, an inner peripheral portion 51c disposed radially inward of the outer peripheral portion 51b, and an intermediate portion 51d connecting the outer peripheral portion 51b and the inner peripheral portion 51 c. The intermediate portion 51d extends in the radial direction of the large-diameter roller 50. Further, a plurality of ribs (not shown) are provided on the inner peripheral surface of the outer peripheral portion 51b, and each rib is connected to the intermediate portion 51d and/or the inner peripheral portion 51 c. The hole 51a is formed in the inner peripheral portion 51 c.

The shaft 53 is made of metal such as iron and aluminum. Since core member 51 is supported by shaft 53 via bearing 54, core member 51 can rotate about rotation axis RL2 with respect to shaft 53. A step against which the bearing 54 abuts is formed on the inner peripheral surface of the hole 51a of the core member 51, and a step against which the bearing 54 abuts is also formed on the outer peripheral surface of the shaft 53. A sleeve may be disposed on the outer peripheral surface of the shaft 53, and the bearing 54 may be in contact with the sleeve.

As shown in fig. 1 and the like, each support portion 60 includes: a first arm member 70 that supports one end side in the axial direction of a corresponding one of the small-diameter rollers 40; and a second arm member 80 that supports the other end side in the axial direction of the corresponding small-diameter roller 40. In the present embodiment, the first arm member 70 supports one end side in the axial direction of the shaft 43 corresponding to the small-diameter roller (corresponding to the first roller) 40, and the second arm member 80 supports the other end side in the axial direction of the shaft 43 corresponding to the small-diameter roller 40.

As shown in fig. 1 and the like, the first arm member 70 of one of the two support portions 60 adjacent to each other in the circumferential direction of the boss members 20 and 30 and the second arm member 80 of the other support portion support the corresponding large-diameter roller (corresponding second roller) 50 of the plurality of large-diameter rollers 50. In the present embodiment, the second arm member 80 supports one end side in the axial direction of the shaft 53 corresponding to the large-diameter roller 50, and the first arm member 70 supports the other end side in the axial direction of the shaft 53 corresponding to the large-diameter roller 50.

In some cases, the shaft 43 is not provided in the small-diameter roller 40. In this case, the bearing 44 corresponding to one end side in the axial direction of the small-diameter roller 40 is supported by the first arm member 70, and the bearing 44 corresponding to the other end side in the axial direction of the small-diameter roller 40 is supported by the second arm member 80.

In addition, in some cases, the shaft 53 is not provided to the large-diameter roller 50. In this case, the bearing 54 corresponding to one end side in the axial direction of the large diameter roller 50 is supported by the second arm member 80, and the bearing 54 corresponding to the other end side in the axial direction of the large diameter roller 50 is supported by the first arm member 70.

The arm members 70 and 80 are made of metal such as aluminum and formed by casting. The arm members 70, 80 may also be formed by sintering metal powder. The arm members 70 and 80 may be formed of a metal plate such as iron and formed by press forming. The arm members 70, 80 may also be formed of metal, plastic, or plastic and metal. The arm members 70 and 80 may be formed of a metal such as aluminum or iron, and formed by forging.

As shown in fig. 9, a small-diameter roller support portion 71 that supports one end of the corresponding small-diameter roller 40 is provided on one end side of the first arm member 70, and a first attached portion 72 that is attached to the boss members 20 and 30 is provided on the other end side of the first arm member 70.

As shown in fig. 7 to 10, the first arm member 70 further includes: a base end side portion 73 extending from the first attached portion 72 mainly in the axial direction of the corresponding small-diameter roller 40; a large-diameter roller support portion 74 for supporting the large-diameter roller 50; and a connecting portion 75 connecting the large-diameter roller support portion 74 and the small-diameter roller support portion 71.

The small-diameter roller support portion 71 is provided with a hole 71a into which a small-diameter roller bolt (fastening member) B1 described later is screwed, and the large-diameter roller support portion 74 is provided with a hole 74a into which a large-diameter roller bolt (fastening member) B2 described later is inserted.

In the present embodiment, a plane CL including the center line of the hole 71a and the center line of the hole 74a is the center of the first arm member 70 in the predetermined direction along the rotation axis RL. The first attached portion 72 is not arranged at the center with respect to the center, but is arranged at a position shifted in the predetermined direction with respect to the center (see fig. 10). In the present embodiment, the position of the end portion in the predetermined direction in the first attached portion 72 coincides with the position of the surface CL.

The center of the base end side portion 73 in the width direction may be the center of the first arm member 70 in a predetermined direction along the rotation axis RL.

In the present embodiment, the base end side portion 73 is substantially plate-shaped, and the position of the center of the base end side portion 73 in the predetermined direction also coincides with the position of the center line CL. In the present embodiment, at least one of the thickness dimension and the width dimension of the base end side portion 73 gradually decreases toward the one end side of the first arm member 70.

The distal end portion of the base end side portion 73 is curved in a direction along the rotation axis RL2 of the corresponding large-diameter roller 50, and a large-diameter roller support portion 74 is provided at the distal end of the base end side portion 73. In the present embodiment, the large-diameter roller support portion 74 includes: a base portion 74b extending radially outward from the distal end of the base end side portion 73 of the hub members 20, 30; and a cylindrical portion 74c extending from the base portion 74b or the vicinity of the base portion 74b in a direction along the rotation axis RL2 of the corresponding large-diameter roller 50. The cylindrical portion 74c protrudes from the base portion 74b in a direction away from the first attached portion 72. In the present embodiment, the radial direction of the hub members 20, 30 coincides with the radial direction of the omni wheel 1.

The inner diameter of the cylindrical portion 74c is slightly larger than the outer diameter of the other end side of the shaft 53 of the large-diameter roller 50 in the axial direction. Alternatively, the inner diameter of the cylindrical portion 74c is equal to the outer diameter of the other end side of the shaft 53 in the axial direction.

If the other end side of the shaft 53 corresponding to the large-diameter roller 50 in the axial direction is inserted into the cylindrical portion 74c, the distal end face of the cylindrical portion 74c is pressed against the inner ring of the bearing 54, whereby the inner ring of the bearing 54 is pressed against the step corresponding to the other end side of the shaft 53 of the large-diameter roller 50.

In some cases, the cylindrical portion 74c is not formed in the large-diameter roller support portion 74. In this case, a counterbore is provided in the base portion 74b, and the end of the shaft 53 is fitted into the counterbore. In some cases, the large-diameter roller support portion 74 has another structure capable of supporting the other end side of the corresponding large-diameter roller 50.

Further, the inner peripheral surface of the shaft 53 of the large-diameter roller 50 may be fitted to the outer peripheral surface of the cylindrical portion 74c of the large-diameter roller support portion 74. In this case, the inner ring of the bearing 54 is fitted to the outer peripheral surface of the cylindrical portion 74 c. Or the inner ring of the bearing 54 is fitted to the outer peripheral surface of the shaft 53. At this time, the end face of the shaft 53 is pressed against the inner ring of the bearing 54 in the axial direction, and the outer ring of the bearing 54 is fitted to the inner circumferential surface of the inner circumferential portion 51c, or the outer ring of the bearing 54 may be fitted to the inner circumferential surface of the inner circumferential portion 51c without providing the shaft 53.

The inner circumferential surface of the inner circumferential portion 51c of the large-diameter roller 50 may be formed to be small, and the shaft 53 of the large-diameter roller 50 may be fixed to the inner circumferential portion 51c by fitting or the like. In such a configuration, the shaft 53 may be omitted and the inner peripheral portion 51c may be formed in a shape in which the shaft 53 is integrated.

In this configuration, the outer ring of the bearing 54 may be fitted to the inner peripheral surface of the cylindrical portion 74c of the large-diameter roller support portion 74, and the inner ring of the bearing 54 may be fitted to the outer peripheral surface of the shaft 53 or the outer peripheral surface of the inner peripheral portion 51 c. In this case, too, the large-diameter roller 50 is rotatably supported by the large-diameter roller support portion 74.

In the present embodiment, the small-diameter roller support portion 71 includes a base portion 71b extending radially outward of the boss members 20 and 30, and a cylindrical portion 71c extending from the vicinity of the base portion 71b or the base portion 71b in a direction along the rotation axis RL1 of the small-diameter roller 40. The cylindrical portion 71c protrudes from the base portion 71b toward the first attached portion 72.

The inner diameter of the cylindrical portion 71c is slightly larger than the outer diameter of the small-diameter roller 40 on the one axial end side of the shaft 43. Alternatively, the inner diameter of the cylindrical portion 71c is equal to the outer diameter of the shaft 43 at one end in the axial direction.

If the cylindrical portion 71c is inserted into the one end side of the shaft 43 corresponding to the small-diameter roller 40 in the axial direction, the distal end surface of the cylindrical portion 71c is pressed against the inner ring of the bearing 44, whereby the inner ring of the bearing 44 is pressed against the step corresponding to the one end side of the shaft 43 of the small-diameter roller 40.

In some cases, the cylindrical portion 71c is not formed in the small-diameter roller support portion 71. In this case, a counterbore is provided in the base portion 71b, and the end portion of the shaft 43 is fitted into the counterbore. In some cases, the small-diameter roller support portion 71 has another structure capable of supporting the other end side of the corresponding small-diameter roller 40.

Further, the inner peripheral surface of the shaft 43 of the small-diameter roller 40 may be fitted to the outer peripheral surface of the cylindrical portion 71c of the small-diameter roller support portion 71. In this case, the inner ring of the bearing 44 is fitted to the outer peripheral surface of the cylindrical portion 71 c. Or the inner race of the bearing 44 is fitted to the outer peripheral surface of the shaft 43. At this time, the end face of the shaft 43 is pressed against the inner ring of the bearing 44 in the axial direction, and the outer ring of the bearing 44 is fitted to the inner circumferential surface of the core member 41, or the outer ring of the bearing 44 may be fitted to the inner circumferential surface of the core member 41 without providing the shaft 43.

Further, the inner peripheral surface of the core member 41 of the small-diameter roller 40 may be formed small, and the shaft 43 of the small-diameter roller 40 may be fixed to the core member 41 by fitting or the like. In such a configuration, the shaft 43 may be omitted and the core member 41 may be formed in a shape in which the shaft 43 is integrated.

In this configuration, the outer ring of the bearing 44 may be fitted to the inner peripheral surface of the cylindrical portion 71c of the small-diameter roller support portion 71, and the inner ring of the bearing 44 may be fitted to the outer peripheral surface of the shaft 43 or the outer peripheral surface of the core member 41. In these cases, too, the small-diameter roller 40 is rotatably supported by the small-diameter roller support portion 71.

The connecting portion 75 connects the large-diameter roller support portion 74 and the small-diameter roller support portion 71. In the present embodiment, the connecting portion 75 connects the base portion 74b of the large-diameter roller support portion 74 and the base portion 71b of the small-diameter roller support portion 71. The connection portion 75 may connect another portion of the large-diameter roller support portion 74 to another portion of the small-diameter roller support portion 71.

When viewed from the direction in which the rotation axis RL extends, that is, when the first arm member 70 is viewed as in fig. 1 or 9, the connecting portion 75 mainly extends along the direction in which the rotation axis RL2 of the corresponding large-diameter roller 50 extends. In the present embodiment, when the first arm member 70 is viewed as in fig. 9, the direction in which the connecting portion 75 extends is a direction in which a straight line connecting a center point P1 on the small-diameter roller supporting portion 71 side of the connecting portion 75 and a center point P2 on the large-diameter roller supporting portion 74 side of the connecting portion 75 extends.

When the angle formed by the direction in which the connection portion 75 extends and the direction in which the rotation axis RL2 extends is 30 ° or less as viewed from the direction in which the rotation axis RL extends, it can be said that the connection portion 75 extends mainly along the direction in which the rotation axis RL2 extends. Preferably, when the angle formed by the direction in which the connection portion 75 extends and the direction in which the rotation axis RL2 extends is 20 ° or less, it can be said that the connection portion 75 extends mainly along the direction in which the rotation axis RL2 extends. More preferably, when the angle formed by the direction in which the connection portion 75 extends and the direction in which the rotation axis RL2 extends is 15 ° or less, it can be said that the connection portion 75 extends mainly along the direction in which the rotation axis RL2 extends.

As shown in fig. 9, a small-diameter roller support portion 81 that supports the other end of the corresponding small-diameter roller 40 is provided on one end side of the second arm member 80, and a second attached portion 82 that is attached to the boss members 20 and 30 is provided on the other end side of the second arm member 80.

As shown in fig. 7 to 10, the second arm member 80 further includes: a base end side portion 83 extending from the second attached portion 82 mainly in the axial direction of the corresponding small-diameter roller 40; a large-diameter roller support portion 84 for supporting the large-diameter roller 50; and a connecting portion 85 connecting the large-diameter roller support portion 84 and the small-diameter roller support portion 81.

The small-diameter roller support 81 is provided with a hole 81a through which a small-diameter roller bolt B1 described later is inserted, and the large-diameter roller support 84 is provided with a hole 84a through which a large-diameter roller bolt B2 described later is screwed.

In the present embodiment, a plane CL including the center line of the hole 81a and the center line of the hole 84a is the center of the second arm member 80 in the predetermined direction along the rotation axis RL. The second attached portion 82 is not disposed at the center with respect to the center, but is disposed at a position offset in the predetermined direction with respect to the center (see fig. 10). In the present embodiment, the position of the end portion in the predetermined direction in the second attached portion 82 coincides with the position of the surface CL. The first attached portion 72 and the second attached portion 82 are aligned in the predetermined direction, and the first attached portion 72 and the second attached portion 82 are disposed on the opposite side of the center from each other.

The center of the base end side portion 83 in the width direction may be the center of the second arm member 80 in a predetermined direction along the rotation axis RL.

In the present embodiment, the base end side portion 83 has a substantially plate shape, and the position of the center of the base end side portion 83 in the predetermined direction also coincides with the position of the center line CL. In the present embodiment, at least one of the thickness dimension and the width dimension of the base end side portion 83 gradually decreases toward the one end side of the second arm member 80.

The distal end portion of the base end side portion 83 is curved in a direction along the rotation axis RL2 of the corresponding large-diameter roller 50, and a large-diameter roller support portion 84 is provided at the distal end of the base end side portion 83. In the present embodiment, the large-diameter roller support portion 84 includes: a base portion 84b extending radially outward from the distal end of the base end side portion 83 toward the hub members 20, 30; and a cylindrical portion 84c extending from the base portion 84b or the vicinity of the base portion 84b in a direction along the rotation axis RL2 of the corresponding large-diameter roller 50. The cylindrical portion 84c protrudes from the base portion 84b toward a direction separating from the second mounted portion 82.

The inner diameter of the cylindrical portion 84c is slightly larger than the outer diameter of the large-diameter roller 50 at one end side in the axial direction of the shaft 53. Alternatively, the inner diameter of the cylindrical portion 84c is equal to the outer diameter of the shaft 53 at one end in the axial direction.

If one end side in the axial direction of the shaft 53 corresponding to the large-diameter roller 50 is inserted into the cylindrical portion 84c, the distal end face of the cylindrical portion 84c is pressed against the inner ring of the bearing 54, whereby the inner ring of the bearing 54 is pressed against the step on the one end side of the shaft 53 corresponding to the large-diameter roller 50.

In some cases, the cylindrical portion 84c is not formed in the large-diameter roller support portion 84. In this case, a counterbore is provided in the base portion 84b, and the end portion of the shaft 53 is fitted into the counterbore. In some cases, the large-diameter roller support portion 84 has another structure capable of supporting the other end side of the corresponding large-diameter roller 50.

In the present embodiment, the small-diameter roller support portion 81 includes: a base portion 81b extending radially outward of the hub members 20, 30; and a cylindrical portion 81c extending from the base portion 81b or the vicinity of the base portion 81b in a direction along the rotation axis RL1 of the corresponding small-diameter roller 40. The cylindrical portion 81c protrudes from the base portion 81b in a direction approaching the second attached portion 82.

The inner diameter of the cylindrical portion 81c is slightly larger than the outer diameter of the other end side of the shaft 43 of the small-diameter roller 40 in the axial direction. Alternatively, the inner diameter of the cylindrical portion 81c is equal to the outer diameter of the other end side in the axial direction of the shaft 43.

If the cylindrical portion 81c is inserted into the other end side of the shaft 43 corresponding to the small-diameter roller 40 in the axial direction, the distal end surface of the cylindrical portion 81c is pressed against the inner ring of the bearing 44, whereby the inner ring of the bearing 44 is pressed against the step corresponding to the other end side of the shaft 43 of the small-diameter roller 40.

In some cases, the cylindrical portion 81c is not formed in the small-diameter roller support portion 81. In this case, a counterbore is provided in the base 81b, and the end of the shaft 43 is fitted into the counterbore. In some cases, the small-diameter roller support portion 81 has another structure capable of supporting the other end side of the corresponding small-diameter roller 40.

The connecting portion 85 connects the large-diameter roller support portion 84 and the small-diameter roller support portion 81. In the present embodiment, the connecting portion 85 connects the base portion 84b of the large-diameter roller support portion 84 and the base portion 81b of the small-diameter roller support portion 81. The connecting portion 85 may connect another portion of the large-diameter roller support portion 84 to another portion of the small-diameter roller support portion 81.

When viewed from the direction in which the rotation axis RL extends, that is, when the second arm member 80 is viewed as in fig. 1 or 9, the connecting portion 85 extends mainly along the direction in which the rotation axis RL2 of the corresponding large-diameter roller 50 extends. The definition of the direction in which the connecting portion 85 extends is the same as that of the direction in which the connecting portion 75 of the first arm member 70 extends.

As shown in fig. 1 and 3, a large-diameter roller bolt B2 passes through the hole 74a of the first arm member 70 and the shaft 53 of the large-diameter roller 50, and is screwed into the hole 84a of the second arm member 80. Thereby, the corresponding large-diameter roller 50 is supported by the pair of adjacent supporting portions 60. In the case where the hole 84a is not a female screw hole, a nut is provided in the vicinity of the hole 84 a.

The small-diameter roller bolt B1 is inserted through the hole 81a of the second arm member 80 and the shaft 43 of the small-diameter roller 40, and is screwed into the hole 71a of the first arm member 70. Thereby, the corresponding small-diameter roller 40 is supported by the support portion 60. In the case where the hole 71a is not a female screw hole, a nut is provided in the vicinity of the hole 71 a. If the nut is made of a material having a higher strength than aluminum, such as iron, the small-diameter roll 40 can be reliably fixed by the small-diameter roll bolt B1. The nut may be fitted into a hole provided in the first arm member 70.

The first mounted portion 72 is provided with a hole 72a penetrating in a direction along the rotation axis RL, and the second mounted portion 82 is also provided with a hole 82a penetrating in a direction along the rotation axis RL.

As shown in fig. 4, holes 21 and 31 are formed in the hub members 20 and 30 at positions corresponding to the small-diameter roller 40. The bolt B is inserted through the hole 21 of the hub member 20, the hole 72a of the first mounting part 72, the hole 82a of the second mounting part 82, and the hole 31 of the hub member 30, and is screwed into the female screw hole of the nut N. Thereby, the plurality of support portions 60 are attached to the hub members 20 and 30, respectively. Female threaded bores may also be formed in the hub member 30. Fig. 3 shows a state in which the shafts 43 and 53 are fixed to the support portion 60.

In addition, the positions of the first mounted portion 72 and the second mounted portion 82 are aligned with the center position of the corresponding small-diameter roller 40 in the direction along the rotation axis RL1 of the corresponding small-diameter roller 40.

In the present embodiment, of the base ends of the base end side portions 83 of the second arm members 80 fixed as described above, the portion where the second attached portion 82 is not provided comes into contact with the first attached portion 72 or the base end side portion 73 of the first arm member 70, or comes close to the first attached portion 72 or the base end side portion 73 (see fig. 7 and 9). Therefore, when a large force in the wheel radial direction, the wheel width direction, or the like is applied to the second arm member 80, the deformation of the base end side portion 83 of the second arm member 80 is suppressed by the first attached portion 72 or the base end side portion 73.

Further, of the base ends of the base end side portions 73 of the first arm members 70 fixed as described above, the portion not provided with the first attached portion 72 is in contact with the second attached portion 82 or the base end side portion 83 of the second arm member 80, or is close to the second attached portion 82 or the base end side portion 83. Therefore, when a large force in the wheel radial direction, the wheel width direction, or the like is applied to the first arm member 70, the deformation of the base end side portion 73 of the first arm member 70 is suppressed by the second attached portion 82 or the base end side portion 83.

In the present embodiment, the first arm member 70 is different from the second arm member 80 in that the hole 71a is a female screw hole and the hole 81a is a through hole, and the hole 74a is a through hole and the hole 84a is a female screw hole, and other configurations are the same. That is, the first arm member 70 has the same shape as the second arm member 80 at least except for the holes 71a, 74a, 81a, and 84a, and the shape of the second arm member 80 is obtained if the first arm member 70 is turned upside down. This structure is advantageous in reducing the manufacturing cost.

When producing the omni wheel 1, the large-diameter roller 50 is supported between the pair of support portions 60 by the large-diameter roller bolt B2, the small-diameter roller 40 is supported by one of the pair of support portions 60 by the small-diameter roller bolt B1, and then the large-diameter roller 50 is similarly supported. By repeating such an operation, the plurality of rollers 40 and 50 are coupled in the circumferential direction of the omni wheel 1.

As shown in fig. 1, recesses 55 into which parts of both ends of the small-diameter roller 40 in the axial direction enter are formed at both ends of the large-diameter roller 50 in the axial direction. By disposing a part of each of the axial ends of the small-diameter roller 40 in the concave portion 55 of the large-diameter roller 50, the distance between the small-diameter roller 40 and the large-diameter roller 50 in the circumferential direction is reduced.

As described above, when the plurality of rollers 40 and 50 are coupled in the circumferential direction, the head of the small-diameter roller bolt B1 cannot be turned with a tool when the last roller 40 of the plurality of rollers 40 is attached to the support portion 60 with the small-diameter roller bolt B1. This is apparent from fig. 1 and the like.

To solve this problem, for example, as shown in fig. 11, a first roll group G1 and a second roll group G2 each having at least one small-diameter roll 40 and at least one large-diameter roll 50 are manufactured. In each of the roller groups G1 and G2, the large-diameter roller 50 and the small-diameter roller 40 are supported by the support 60 by bolts B1 and B2. Three or more roller groups can be produced.

As shown in fig. 1 and 11, in order to connect the plurality of roller groups G1, G2 to each other, the small-diameter roller 40 at the end of each of the roller groups G1, G2 is formed with a hole 40a extending from the outer circumferential surface of the small-diameter roller 40 to the inner circumferential surface of the shaft 43 of the small-diameter roller 40. Further, a chamfer (engagement portion) 90 is formed on the outer peripheral surface of the small-diameter roller bolt B1 for the small-diameter roller 40 at a position corresponding to the hole 40 a.

As shown in fig. 1 and 12, the chamfer 90 has a first flat portion 91, a second flat portion 92, and a curved surface portion 93, the second flat portion 92 being located at a position different from the first flat portion 91 in the circumferential direction of the outer peripheral surface of the small-diameter roller bolt B1, the curved surface portion 93 connecting the first flat portion 91 and the second flat portion 92.

The hole 40a penetrates the outer peripheral member 42 of the small-diameter roller 40, the core member 41, and the shaft 43. In the hole 40a, for example, a female thread is formed at a portion provided to the core member 41 or the shaft 43.

The screw member 94 is screwed into the female screw, and the screw turning tool is engaged with a groove formed in an end surface of the screw member 94, whereby the screw member 94 is screwed into the small-diameter roller bolt B1. Thereby, the screw member 94 engages with the chamfer 90. In this state, the small-diameter roller 40 is turned in a predetermined direction by a tool, a hand, or the like, so that the small-diameter roller bolt B1 rotates together with the small-diameter roller 40, and the small-diameter roller bolt B1 is screwed into the hole 71a of the first arm member 70. Thus, the shaft 43 of the small-diameter roller 40 is fixed to the first arm member 70 and the second arm member 80 by the small-diameter roller bolt B1. This operation may be performed in a state where a part of the support portion 60 is attached to the boss members 20 and 30, or the support portion 60 may be attached to the boss members 20 and 30 after the coupling of the rollers 40 and 50 is completed.

Next, the screw member 94 is moved radially outward of the small-diameter roller 40 by the screw turning tool. Thereby, the small-diameter roller 40 is rotatable. In some cases, the threaded member 94 functions as a plug member for plugging the hole 40 a. On the other hand, after the screw member 94 is removed from the hole 40a, the plug member 95 may be attached to the hole 40a as shown in fig. 1 (fig. 12).

On the other hand, the plurality of small-diameter rollers 40 and the plurality of large-diameter rollers 50 may be sequentially connected by the plurality of first arm members 70, the plurality of second arm members 80, the plurality of small-diameter roller bolts B1, and the plurality of large-diameter roller bolts B2, and the small-diameter roller bolt B1 of the last small-diameter roller 40 may be screwed to the first arm member 70.

When the small-diameter roller bolt B1 is screwed into the hole 71a of the first arm member 70, the small-diameter roller 40 and the screw member 94 rotate in the direction of arrow a in fig. 12, and the screw member 94 engages with the first flat surface portion 91. Here, the second flat surface portion 92 and the curved surface portion 93 are formed on the chamfer 90. Therefore, if the small-diameter roller 40 is rotated in the direction opposite to the arrow a, the screw member 94 moves from the first flat portion 91 to the second flat portion 92 via the curved portion 93.

In some cases, the hole 40a is disposed on the side of the support portion 60 when the small-diameter roller 40 is completely screwed by rotating the small-diameter roller 40 in the direction of the arrow a with the small-diameter roller bolt B1 being screwed in. In this state, the screw member 94 cannot be separated from the small-diameter roller bolt B1, and the small-diameter roller 40 cannot rotate. If the second flat surface portion 92 and the curved surface portion 93 are provided, the small-diameter roller 40 can be moved in the direction opposite to the arrow a after the small-diameter roller bolt B1 is completely screwed in. Therefore, the hole 40a can be moved to a position not corresponding to the support portion 60, and the screw member 94 can be separated from the small-diameter roller bolt B1.

As shown in fig. 13, a hole 96 may be provided in the small-diameter roller bolt B1 instead of the chamfer 90. In this case, the hole 40a may penetrate the small-diameter roller 40 in the radial direction. The threaded member 94 passes through the hole 96 and the hole 40a and is screwed to a female thread provided in the hole 40a, for example, to the core member 41 or the shaft 43. In this state, the small-diameter roller 40 is rotated, whereby the small-diameter roller bolt B1 can be screwed into the first arm member 70. Preferably, a groove for engaging with a screw turning tool is formed at each end of the screw member 94.

As shown in fig. 14, a hole 50a extending from the outer peripheral surface of the large-diameter roller 50 to the recess 55 of the large-diameter roller 50 may be formed in the large-diameter roller 50 near the head of the small-diameter roller bolt B1 that is finally screwed in. In this case, the bolt turning tool can be used to screw the small-diameter roller 40 into the hole 71a of the first arm member 70 through the hole 50 a. The hole 50a may also be blocked by a plug member 50 b.

As shown in fig. 15, the one end side of the shaft 43 of the small-diameter roller 40 finally attached to the first arm member 70 may be fixed to the first arm member 70 by a fixing member 97. In this case, a hole penetrating the shaft 43 in the radial direction is provided on one end side of the shaft 43, and a hole is also provided in the first arm member 70 at a position corresponding to the hole of the shaft 43. The fixing member 97 is fixed to the first arm member 70 in a state where the fixing member 97 penetrates the hole of the first arm member 70 and the hole of the shaft 43. Thereby, one end side of the shaft 43 of the small-diameter roller 40 is fixed to the first arm member 70.

In this case, as shown in fig. 15, the other end side of the shaft 43 of the small-diameter roller 40 is fixed to the second arm member 80 by a short small-diameter roller bolt B1.

The fixing member 97 is a metal pin, bolt, screw member, rivet, or the like.

As shown in fig. 16, one end side of the shaft 43 of the small-diameter roller 40 finally attached to the first arm member 70 may be fixed to the first arm member 70 with an adhesive.

In each of the above embodiments, a part or all of the shaft 43 in the longitudinal direction may be solid as shown in fig. 15, or all of the shaft 43 in the longitudinal direction may be hollow.

The omni wheel 1 configured as described above is used as, for example, a front wheel of an electric mobile device 100 (see fig. 5) on which a person sits. The omni-wheel 1 may also be used as a rear wheel or other wheel of the motorized mobile device 100. In addition, in some cases, the omni wheel 1 is used as a wheel of other equipment such as a robot or as a wheel of other vehicles.

For example, as shown in fig. 5 and 6, the electric mobile device 100 includes a mobile device main body 110, and the mobile device main body 110 includes omni wheels 1 as front wheels, rear wheels 120, and a body 130 supported by the omni wheels 1 and the rear wheels 120. In addition, the electric mobile device includes: a seat unit (seat) 140 detachably attached to the mobile device main body 110; and a driving device 150 such as a motor, which is attached to the mobile device main body 110 and drives at least one of the omni wheel 1 and the rear wheel 120.

In the case where the omni wheel 1 is used in such a power-driven traveling apparatus, the rollers 40 and 50 of the omni wheel 1 receive a large force. The weight of a motorized mobile device is often above 50kg, even approaching 100 kg. In addition, the weight of the driver riding the electric mobile device is also different. Further, the electric mobile device may need to go over a step, and may need to travel on a rough road surface. Therefore, the rollers 40 and 50 are often subjected to a force of 300N or more, and may be subjected to a force exceeding 500N. In addition, such powered mobile devices are used for long periods of time each day. Therefore, the omni wheel 1 is required to have a high level of strength and durability.

In the present embodiment, the corresponding small-diameter roller 40 is supported by each support portion 60, one end side in the axial direction of the corresponding small-diameter roller 40 is supported by the first arm member 70, and the other end side in the axial direction of the corresponding small-diameter roller 40 is supported by the second arm member 80. Further, the first arm member 70 and the second arm member 80 of one and the other of the two support portions 60 adjacent to each other in the circumferential direction support the corresponding large-diameter roller 50. In this way, the small-diameter roller 40 is supported not by a single member but by the first arm member 70 and the second arm member 80. The large-diameter roller 50 is also supported by the second arm member 80 on one end side and the first arm member 70 on the other end side.

Therefore, as compared with the case where the small-diameter roller 40 is supported by a single member, the adjacent components are connected to each other tightly, and the force received by the small-diameter roller 40 due to contact with the road surface can be transmitted to the adjacent large-diameter roller 50 relatively easily. Further, the force received by the large-diameter roller 50 can be more easily transmitted to the adjacent small-diameter roller 40. Further, the force received by the large-diameter roller 50 due to contact with the road surface can be transmitted to the adjacent small-diameter roller 40 relatively easily. With this structure, not only can the wall thickness of the first arm member 70 and the second arm member 80 be reduced, but also the force received by each of the rollers 40, 50 can be effectively prevented by the adjacent rollers 40, 50 and arm members 70, 80.

Further, compared to the case where the small-diameter roller 40 is supported by a single member, when the rollers 40 and 50 and the support portions 60 are attached to the boss members 20 and 30, the one end side of the small-diameter roller 40 is easily disposed at an appropriate position with respect to the first arm member 70. Further, the other end side of the small-diameter roller 40 can be easily disposed at an appropriate position with respect to the second arm member 80. This configuration facilitates the effective resistance of the forces experienced by each roller 40, 50 by the abutting rollers 40, 50 and arm members 70, 80. This can achieve both an increase in the force received by each of the rollers 40 and 50 and a reduction in weight at a high level.

In the present embodiment, one end side of the first arm member 70 in the axial direction of the corresponding small-diameter roller 40 is supported by one end side thereof, and the other end side of the first arm member 70 is attached to the boss members 20 and 30. The other end side in the axial direction of the corresponding small-diameter roller 40 is supported by one end side of the second arm member 80, and the other end side of the second arm member 80 is attached to the rollers 40 and 50. In this way, in the first arm member 70, since the portion supporting the corresponding small-diameter roller 40 is separated from the portion attached to the boss members 20 and 30, the force received by the small-diameter roller 40 is easily transmitted to the adjacent large-diameter roller 50, and the force received by the large-diameter roller 50 is also easily transmitted to the adjacent small-diameter roller 40.

Further, in the first arm member 70, since the portion supporting the corresponding small-diameter roller 40 is separated from the portion attached to the boss members 20 and 30, when the rollers 40 and 50 and the support portions 60 are attached to the boss members 20 and 30, the one end side of the first arm member 70 is easily disposed at an appropriate position with respect to the one end side of the corresponding small-diameter roller 40, and the one end side of the second arm member 80 is easily disposed at an appropriate position with respect to the other end side of the corresponding small-diameter roller 40.

In the present embodiment, each support portion 60 supports the corresponding small-diameter roller 40, and one small-diameter roller bolt (fastening member) B1 extending in the axial direction of the corresponding small-diameter roller 40 is fixed to the first arm member 70 and the second arm member 80 on one axial end side and the other axial end side of the corresponding small-diameter roller 40. With this configuration, the force received by the small-diameter roller 40 or the large-diameter roller 50 is easily transmitted to the adjacent small-diameter rollers 40 and large-diameter rollers 50 in sequence.

In the present embodiment, the pair of support portions 60 support the corresponding large-diameter roller 50, and the corresponding large-diameter roller 50 is fixed to the first arm member 70 and the second arm member 80 by one large-diameter roller bolt B2 (fastening member) extending in the axial direction of the corresponding large-diameter roller 50. With this configuration, the force received by the small-diameter roller 40 or the large-diameter roller 50 is more easily transmitted to the adjacent small-diameter roller 40 and large-diameter roller 50.

In the present embodiment, the connecting portion 75 of the first arm member 70 that connects the small-diameter roller support portion 71 and the large-diameter roller support portion 74 extends mainly in a direction corresponding to the direction in which the rotation axis RL2 of the large-diameter roller 50 extends, as viewed from the direction in which the rotation axis RL extends. With this configuration, the force received by the small-diameter roller 40 or the large-diameter roller 50 is more easily transmitted to the adjacent small-diameter roller 40 and large-diameter roller 50. In addition, this structure is advantageous in thinning the wall thickness of the connection portion 75. In the present embodiment, the connecting portion 85 of the second arm member 80 has the same configuration, and the same effects can be achieved.

In the present embodiment, the other end side of the first arm member 70 and the other end side of the second arm member 80 overlap in a predetermined direction along the rotation axis RL. In the present embodiment, the first attached portion 72 on the other end side of the first arm member 70 and the second attached portion 82 on the other end side of the second arm member 80 overlap each other in a predetermined direction along the rotation axis RL, and the first attached portion 72 and the second attached portion 82 are attached to the boss members 20 and 30. Further, as described above, the force received by the small-diameter roller 40 or the large-diameter roller 50 is more easily transmitted to the adjacent small-diameter roller 40 and large-diameter roller 50. Therefore, the omni wheel 1 of the present embodiment can receive the force received by the small-diameter roller 40 and the large-diameter roller 50 while reducing the number of components.

In the present embodiment, the single first attached portion 72 and the single second attached portion 82 overlap each other in a predetermined direction along the rotation axis RL. Therefore, the first to-be-mounted portion 72 and the second to-be-mounted portion 82 can be reliably mounted to the hub members 20 and 30 without machining the end surface of the first to-be-mounted portion 72 in the predetermined direction and the end surface of the second arm member 80 in the predetermined direction. This results in a reduction in the manufacturing cost of each arm member 70, 80.

Further, a plurality of first attached portions 72 may be provided in the first arm member 70, a plurality of second attached portions 82 may be provided in the second arm member 80, and the plurality of first attached portions 72 and the plurality of second attached portions 82 may be alternately arranged in a predetermined direction.

In the present embodiment, the first attached portion 72 is formed at a position shifted in one of the predetermined directions with respect to the center of the first arm member 70 in the direction along the rotation axis RL. The second attached portion 82 is formed at a position shifted in the other direction of the predetermined direction with respect to the center of the second arm member 80 in the direction along the rotation axis RL. With this structure, not only can the size of the omni wheel 1 in the direction along the rotation axis RL be reduced, but also the strength of the first arm member 70 and the second arm member 80 attached to the hub members 20, 30 can be ensured.

In the present embodiment, at least one of the plurality of rollers 40, 50 is formed with holes 40a, 50a extending from the outer circumferential surface to the inner circumferential surface. In the present embodiment, the plurality of rollers 40 and 50 are connected in a loop shape by the holes 40a and 50 a.

The holes 40a, 50a may also be closed by plug members 95, 50b for closing off the holes 40a, 50 a.

In the present embodiment, the at least one roll is a small-diameter roll 40, one end side and the other end side in the axial direction of the small-diameter roll 40 are attached to the support portion 60 by one small-diameter roll bolt B1 extending in the axial direction of the small-diameter roll, and a chamfer (engagement portion) 90 or a hole (engagement portion) 96 is formed at an axial position corresponding to the hole 40a in the outer peripheral surface of the small-diameter roll bolt B1. Therefore, if the screw member 94 is inserted into the hole 40a and the screw member 94 is engaged with the chamfer 90 or the hole 96, the first roller 40 is rotated to screw the first roller bolt B1 into the first arm member 70.

An omni wheel 1 according to a second embodiment of the present invention will be described with reference to the accompanying drawings.

As shown in fig. 17, the omni wheel 1 of the second embodiment has the first arm member 70 and the second arm member 80 of the support portion 60 in the first embodiment integrated. The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

In the omni wheel 1 according to the first embodiment, the support portion 60 includes two components, i.e., the first arm member 70 and the second arm member 80. Instead, in the omni wheel 1 of the second embodiment, the support portion 60 is a single component, and the support portion 60 includes the first arm 70 and the second arm 80. The first arm member 70 and the first arm 70 are different only in the shape of the base end side and the shape of a part of the tip end side, and are therefore denoted by the same reference numeral. The second arm member 80 and the second arm 80 are different only in the shape on the base end side and in the shape of a part of the tip end side, and are denoted by the same reference numerals.

The support portion 60 is formed of a metal such as aluminum, and is formed by casting. The support portion 60 may be formed by sintering metal powder. The support portion 60 may be formed of a metal plate such as iron, and may be formed by press forming. The support portion 60 may also be formed of metal, plastic, or plastic and metal. The support portion 60 may be formed of a metal such as aluminum or iron, and may be formed by forging.

As shown in fig. 17, a small-diameter roller support portion 71 having a hole 71a and a base portion 71b similar to those of the first embodiment is provided to support one end side of the corresponding small-diameter roller 40 at one end side of the first arm 70. The other end of the first arm 70 is provided with a mounting portion 61 to be mounted on the boss members 20 and 30.

The first arm 70 further has: a base end side portion 73 extending from the attached portion 61 mainly in the axial direction of the corresponding small-diameter roller 40; a large-diameter roller support portion 74 for supporting the large-diameter roller 50; and a connecting portion 75 connecting the large-diameter roller support portion 74 and the small-diameter roller support portion 71.

The small-diameter roller bolt B1 is screwed into the hole 71a provided in the small-diameter roller support portion 71, and the large-diameter roller support portion 74 is provided with a hole 74a through which the large-diameter roller bolt B2 is inserted.

In the present embodiment, a plane including the center line of the hole 71a and the center line of the hole 74a passes through the center in the predetermined direction along the rotation axis RL in the first arm member 70. The attached portion 61 is arranged at a central position with respect to the center. The center of the base end side portion 73 in the width direction may be the center of the first arm member 70 in a predetermined direction along the rotation axis RL.

The distal end portion of the base end side portion 73 is bent mainly in a direction along the rotation axis RL2 of the corresponding large-diameter roller 50, and a large-diameter roller support portion 74 is provided at the distal end of the base end side portion 73. In the present embodiment, the large-diameter roller support portion 74 includes: a base portion 74b extending radially outward from the distal end of the base end side portion 73 of the hub members 20, 30; and a cylindrical portion 74c extending from the base portion 74b or the vicinity of the base portion 74b in a direction along the rotation axis RL2 of the corresponding large-diameter roller 50. The cylindrical portion 74c protrudes from the base portion 74b in a direction away from the attached portion 61. In the present embodiment, the radial direction of the hub members 20, 30 coincides with the radial direction of the omni wheel 1.

The inner diameter of the cylindrical portion 74c is slightly larger than the outer diameter of the other end side of the shaft 53 of the large-diameter roller 50 in the axial direction. Alternatively, the inner diameter of the cylindrical portion 74c is equal to the outer diameter of the other end side of the shaft 53 in the axial direction.

If the other end side of the shaft 53 corresponding to the large-diameter roller 50 in the axial direction is inserted into the cylindrical portion 74c, the distal end face of the cylindrical portion 74c is pressed against the inner ring of the bearing 54, whereby the inner ring of the bearing 54 is pressed against the step corresponding to the other end side of the shaft 53 of the large-diameter roller 50.

In some cases, the cylindrical portion 74c is not formed in the large-diameter roller support portion 74. In this case, a counterbore is provided in the base portion 74b, and the end portion of the shaft 53 is fitted into the counterbore. In some cases, the large-diameter roller support portion 74 has another structure capable of supporting the other end side of the corresponding large-diameter roller 50.

In the second embodiment, the small-diameter roller support portion 71 includes: a base portion 71b extending radially outward of the hub members 20, 30; and a semi-cylindrical portion 71d extending from the base portion 71b or the vicinity of the base portion 71b in a direction along the rotation axis RL1 of the corresponding small-diameter roller 40. The semi-cylindrical portion 71d protrudes from the base portion 71b in a direction approaching the attached portion 61. In the second embodiment, a semi-cylindrical portion 71d is provided instead of the cylindrical portion 71c of the first embodiment.

The inner diameter of the semi-cylindrical portion 71d is slightly larger than the outer diameter of the small-diameter roller 40 on one axial end side of the shaft 43. Alternatively, the inner diameter of the semi-cylindrical portion 71d is equal to the outer diameter of the shaft 43 at one end in the axial direction.

If the semi-cylindrical portion 71d is inserted into the one end side of the shaft 43 corresponding to the small-diameter roller 40 in the axial direction, the tip end surface of the semi-cylindrical portion 71d is pressed against the inner ring of the bearing 44, whereby the inner ring of the bearing 44 is pressed against the step corresponding to the one end side of the shaft 43 of the small-diameter roller 40.

In some cases, the small-diameter roller support portion 71 does not have the semi-cylindrical portion 71 d. In this case, a counterbore is provided in the base portion 71b, and the end portion of the shaft 43 is fitted into the counterbore. In some cases, the small-diameter roller support portion 71 has another structure capable of supporting the other end side of the corresponding small-diameter roller 40.

The connecting portion 75 connects the large-diameter roller support portion 74 and the small-diameter roller support portion 71. In the present embodiment, the connecting portion 75 connects the base portion 74b of the large-diameter roller support portion 74 and the base portion 71b of the small-diameter roller support portion 71. The connection portion 75 may connect another portion of the large-diameter roller support portion 74 to another portion of the small-diameter roller support portion 71.

When viewed from the direction in which the rotation axis RL extends, that is, when the first arm 70 is viewed as in fig. 17, the connection portion 75 mainly extends in the direction in which the rotation axis RL2 of the corresponding large-diameter roller 50 extends. The definition of the direction in which the connecting portion 75 extends is the same as that of the first embodiment.

When the angle formed by the direction in which the connection portion 75 extends and the direction in which the rotation axis RL2 extends is 30 ° or less as viewed from the direction in which the rotation axis RL extends, it can be said that the connection portion 75 extends mainly along the direction in which the rotation axis RL2 extends. Preferably, when the angle formed by the direction in which the connection portion 75 extends and the direction in which the rotation axis RL2 extends is 20 ° or less, it can be said that the connection portion 75 extends mainly along the direction in which the rotation axis RL2 extends. More preferably, when the angle formed by the direction in which the connection portion 75 extends and the direction in which the rotation axis RL2 extends is 15 ° or less, it can be said that the connection portion 75 extends mainly along the direction in which the rotation axis RL2 extends.

As shown in fig. 17, a small-diameter roller support portion 81 that supports one end of the corresponding small-diameter roller 40 is provided on one end side of the second arm 80, and a mounted portion 61 that is common to the first arm 70 is provided on the other end side of the second arm 80.

The second arm 80 further has: a base end side portion 83 extending from the attached portion 61 mainly in the axial direction of the corresponding small-diameter roller 40; a large-diameter roller support portion 84 for supporting the large-diameter roller 50; and a connecting portion 85 connecting the large-diameter roller support portion 84 and the small-diameter roller support portion 81.

The small-diameter roller support 81 is provided with a hole 81a through which a small-diameter roller bolt B1 described later is inserted, and the large-diameter roller support 84 is provided with a hole 84a through which a large-diameter roller bolt B2 described later is screwed. In the case where the hole 84a is not a female screw hole, a nut is provided in the vicinity of the hole 84 a. If the nut is made of a material having a higher strength than aluminum, such as iron, the large-diameter roll 50 can be reliably fixed by the large-diameter roll bolt B2. The nut may be fitted into a hole provided in the second arm member 80.

In the present embodiment, a plane including the center line of the hole 81a and the center line of the hole 84a passes through the center in the predetermined direction along the rotation axis RL in the second arm member 80. The attached portion 61 is arranged at a central position with respect to the center. The center of the base end side portion 83 in the width direction may be the center of the second arm member 80 in a predetermined direction along the rotation axis RL.

The distal end portion of the base end side portion 83 is mainly curved in a direction along the rotation axis RL2 of the corresponding large-diameter roller 50, and a large-diameter roller support portion 84 is provided at the distal end of the base end side portion 83. In the present embodiment, the large-diameter roller support portion 84 includes: a base portion 84b extending radially outward from the distal end of the base end side portion 83 toward the hub members 20, 30; and a cylindrical portion 84c extending from the base portion 84b or the vicinity of the base portion 84b in a direction along the rotation axis RL2 of the corresponding large-diameter roller 50. The cylindrical portion 84c protrudes from the base portion 84b in a direction away from the attached portion 61.

The inner diameter of the cylindrical portion 84c is slightly larger than the outer diameter of the large-diameter roller 50 at one end side in the axial direction of the shaft 53. Alternatively, the inner diameter of the cylindrical portion 84c is equal to the outer diameter of the shaft 53 at one end in the axial direction.

If one end side in the axial direction of the shaft 53 corresponding to the large-diameter roller 50 is inserted into the cylindrical portion 84c, the distal end face of the cylindrical portion 84c is pressed against the inner ring of the bearing 54, whereby the inner ring of the bearing 54 is pressed against the step on the one end side of the shaft 53 corresponding to the large-diameter roller 50.

In some cases, the cylindrical portion 84c is not formed in the large-diameter roller support portion 84. In this case, a counterbore is provided in the base portion 84b, and the end portion of the shaft 53 is fitted into the counterbore. In some cases, the large-diameter roller support portion 84 has another structure capable of supporting the other end side of the corresponding large-diameter roller 50.

In the second embodiment, the small-diameter roller support portion 81 includes: a base portion 81b extending radially outward of the hub members 20, 30; the semi-cylindrical portion 81d extends from the base portion 81b or the vicinity of the base portion 81b in a direction along the rotation axis RL1 of the corresponding small-diameter roller 40. The semi-cylindrical portion 81d protrudes from the base portion 81b in a direction approaching the attached portion 61. In the second embodiment, a semi-cylindrical portion 81d is provided instead of the cylindrical portion 81c of the first embodiment.

The inner diameter of the semi-cylindrical portion 81d is slightly larger than the outer diameter of the other end side in the axial direction of the shaft 43 of the small-diameter roller 40. Alternatively, the inner diameter of the semi-cylindrical portion 81d is equal to the outer diameter of the other end side in the axial direction of the shaft 43.

If the semi-cylindrical portion 81d is inserted into the other end side of the shaft 43 corresponding to the small-diameter roller 40 in the axial direction, the distal end surface of the semi-cylindrical portion 81d is pressed against the inner ring of the bearing 44, whereby the inner ring of the bearing 44 is pressed against the step on the other end side of the shaft 43 corresponding to the small-diameter roller 40.

In some cases, the small-diameter roller support 81 does not have the semi-cylindrical portion 81 d.

The connecting portion 85 connects the large-diameter roller support portion 84 and the small-diameter roller support portion 81. In the present embodiment, the connecting portion 85 connects the base portion 84b of the large-diameter roller support portion 84 and the base portion 81b of the small-diameter roller support portion 81. The connecting portion 85 may connect another portion of the large-diameter roller support portion 84 to another portion of the small-diameter roller support portion 81.

When viewed from the direction in which the rotation axis RL extends, that is, when the second arm 80 is viewed as in fig. 17, the connection portion 85 extends mainly along the direction in which the rotation axis RL2 of the corresponding large-diameter roller 50 extends. The definition of the direction in which the connection portion 85 extends is the same as that of the direction in which the connection portion 75 of the first arm 70 extends.

In the second embodiment, the connecting portion 75 of the first arm member 70, which connects the small-diameter roller support portion 71 and the large-diameter roller support portion 74, extends mainly in a direction corresponding to the rotation axis RL2 of the large-diameter roller 50 when viewed from the direction in which the rotation axis RL extends. With this configuration, the force received by the small-diameter roller 40 or the large-diameter roller 50 is more easily transmitted to the adjacent small-diameter roller 40 and large-diameter roller 50. In addition, this structure is advantageous in thinning the wall thickness of the connection portion 75. In the present embodiment, the coupling portion 85 of the second arm member 80 has the same configuration, and the same effects can be achieved.

In the first embodiment, as shown in fig. 18, the first attached portion 72 of the first arm member 70 and the second attached portion 82 of the second arm member 80 may not overlap in the direction along the rotation axis RL. In this case, the first to-be-mounted portion 72 and the second to-be-mounted portion 82 are mounted to the hub members 20 and 30 with bolts B, respectively.

In the first embodiment, as shown in fig. 19, one hub member H may be used instead of the two hub members 20 and 30. In this case, the first attached portion 72 of the first arm member 70 is disposed on one side in the thickness direction of the hub member H, and the second attached portion 82 of the second arm member 80 is disposed on the other side in the thickness direction of the hub member H. The first mounting portion 72 and the second mounting portion 82 are mounted to the hub member H with bolts B. The first attached portion 72 of the first arm member 70 and the second attached portion 82 of the second arm member 80 may be disposed on one side in the thickness direction of the boss member H. In this case, the first mounting portion 72 and the second mounting portion 82 are also mounted to the hub member H with the bolts B.

In the first embodiment, each support portion 60 supports one small-diameter roller 40. Alternatively, as shown in fig. 20 and 21, the first arm member 70 and the second arm member 80 may be configured such that the support portions 60 support the small-diameter roller 50. In this case, the first arm member 70 supports one end side in the axial direction of the shaft 53 corresponding to the large-diameter roller 50, and the second arm member 80 supports the other end side in the axial direction of the shaft 53 corresponding to the large-diameter roller 50.

Further, the corresponding small-diameter roller 40 of the plurality of small-diameter rollers 40 is supported by one first arm member 70 and the other second arm member 80 of the two support portions 60 adjacent in the circumferential direction. For example, the first arm member 70 supports one end side in the axial direction of the shaft 43 corresponding to the small-diameter roller 40, and the second arm member 80 supports the other end side in the axial direction of the shaft 43 corresponding to the small-diameter roller 40.

As shown in fig. 21, in this modification, the first attached portion 72 on the other end side of the first arm member 70 is long, and the other structure of the first arm member 70 is the same as that of the first embodiment. That is, the first attached portion 72 is provided with the hole 72a, the base end side portion 73 extends from the first attached portion 72 in the axial direction of the small-diameter roller 40, the large-diameter roller support portion 74 is provided at the tip end of the base end side portion 73, the small-diameter roller support portion 71 is provided at one end side of the first arm member 70, and the connecting portion 75 that connects the large-diameter roller support portion 74 and the small-diameter roller support portion 71 is formed. In addition, the connecting portion 75 extends mainly in the direction in which the rotation axis RL2 of the corresponding large-diameter roller 50 extends, as viewed from the direction in which the rotation axis RL extends, in the same manner as in the first embodiment.

The second attached portion 82 on the other end side of the second arm member 80 is long, and other structures of the second arm member 80 are the same as those of the first embodiment. That is, the second attached portion 82 is provided with the hole 82a, the base end side portion 83 extends from the second attached portion 82 in the axial direction of the small-diameter roller 40, the large-diameter roller support portion 84 is provided at the tip end of the base end side portion 83, the small-diameter roller support portion 81 is provided at one end side of the second arm member 80, and the connecting portion 85 that connects the large-diameter roller support portion 84 and the small-diameter roller support portion 81 is formed. In addition, the connecting portion 85 extends mainly in the direction in which the rotation axis RL2 of the corresponding large-diameter roller 50 extends, as viewed from the direction in which the rotation axis RL extends, in the same manner as in the first embodiment.

Further, as in the first embodiment, the small-diameter roller support portion 71 is formed with a hole 71a into which the small-diameter roller bolt B1 is screwed, and the large-diameter roller support portion 74 is formed with a hole 74a into which the large-diameter roller bolt B2 is inserted. Further, as in the first embodiment, the small-diameter roller support portion 81 is provided with a hole 81a through which the small-diameter roller bolt B1 is inserted, and the large-diameter roller support portion 84 is provided with a hole 84a through which the large-diameter roller bolt B2 is screwed.

In this modification, the large-diameter roller 50 is supported by the support portion 60 as a first roller, and the small-diameter roller 40 is supported by the support portion 60 as a second roller.

In this modification, too, the large-diameter roller 50 is not supported by a single member but is supported by the first arm member 70 and the second arm member 80. The small-diameter roller 40 is also supported by the second arm member 80 on one end side and the first arm member 70 on the other end side.

Therefore, compared to the case where the small-diameter roller 40 and the large-diameter roller 50 are supported by a single member, the force received by the small-diameter roller 40 due to contact with the road surface can be easily transmitted to the adjacent large-diameter roller 50, and the force received by the large-diameter roller 50 can be easily transmitted to the adjacent small-diameter roller 40. In addition, this modification can also achieve other effects of the first embodiment.

In the first embodiment, as shown in fig. 1 and 13, a part 76 of one end of the first arm member 70 is disposed between the axial end face 41b of the core member 41 of the small-diameter roller 40 and the axial end face 51e of the outer peripheral portion 51b of the core member 51 of the large-diameter roller 50.

In some cases, there are power cables, cables such as LAN cables, and umbilical members similar to these cables on the ground of offices, indoor corridors, and the like. These cables or umbilical members are present especially under desks and the like.

The electric mobile equipment 100 shown in fig. 5 is highly likely to travel on a ground surface where the cable and the umbilical member are present as described above. Particularly, when a rider works on a desk, if the omni wheel 1, which is a front wheel or a rear wheel, is caused to travel, the omni wheel 1 sometimes presses a cable or an umbilical member.

At this time, since the part 76 of the first arm member 70 is disposed between the end surface 41b of the core member 41 of the small diameter roller 40 and the end surface 51e of the core member 51 of the large diameter roller 50, it is not easy to sandwich the cable or the umbilical member between the small diameter roller 40 and the large diameter roller 50. If the sandwiching occurs, the wire or the filament body is wound around the small-diameter roll 40 or the large-diameter roll 50. The above structure is advantageous in preventing or reducing the malfunction.

As shown in fig. 13, a part 86 of one end of the second arm member 80 is also disposed between the end surface 41b of the core member 41 of the small-diameter roller 40 and the end surface 51e of the outer peripheral portion 51b of the core member 51 of the large-diameter roller 50.

In each of the above embodiments, as shown in fig. 22, the center portion 83a in the wheel width direction of the inner side surface in the wheel radial direction of the base end side portion 83 of the second arm member 80 bulges inward in the wheel radial direction. In the present embodiment, the wheel radial direction coincides with the radial direction of the hub members 20, 30. In the present embodiment, the entire inner side surface bulges inward in the wheel radial direction. In the present embodiment, as shown in fig. 9, the central portion 83a bulges in the entire longitudinal direction of the base end side portion 83 as described above.

A part of the inner side surface faces the inner circumferential surface of the outer circumferential portion 51b of the large-diameter roller 50. Further, of the inner side surfaces, the distance between the center portion 83a in the wheel width direction and the inner circumferential surface of the outer circumferential portion 51b of the large-diameter roller 50, and the distance between the end portion 83b in the wheel width direction and the inner circumferential surface of the outer circumferential portion 51b are 1mm or less. The center portion 73a of the base end side portion 73 of the first arm member 70 also bulges in the same manner as the center portion 83a of the base end side portion 83 of the second arm member 80, and the distance between the inner side surface of the base end side portion 73 and the inner peripheral surface of the outer peripheral portion 51b of the large-diameter roller 50 is also the same.

Therefore, even if the base end side portions 73 and 83 break at the cross-sectional position shown in fig. 22 or at a position closer to the large-diameter roller support portions 74 and 84 than this position, the inner peripheral surface of the outer peripheral portion 51b of the large-diameter roller 50 comes into contact with the inner side surfaces of the base end side portions 73 and 83, and the movement of the large-diameter roller 50 in the wheel radial direction and the wheel circumferential direction with respect to the first arm member 70 and the second arm member 80 is restricted. For example, even after the base end side portions 73 and 83 are ruptured by an unexpected load, the rupturing surfaces face each other. This can restrict the movement of the large-diameter roller 50 in the wheel circumferential direction with respect to the first arm member 70 and the second arm member 80. This effect can be expected if the distance between the center portion 83a in the wheel width direction and the inner circumferential surface of the outer circumferential portion 51b of the large-diameter roller 50 is 2mm or less, but the distance is preferably 1.5mm or less.

Further, the large-diameter roller support portions 74 and 84 of the base end side portions 73 and 83 are disposed in the concave portion 55 of the large-diameter roller 50. Therefore, the large-diameter roller 50 is hooked on the base end side portions 73 and 83, and the large-diameter roller 50 can be prevented from falling off from the omni wheel. In this case, even if the base end side portions 73 and 83 are broken by an unexpected load, the omnidirectional wheel can be used to travel.

Further, disposing a part of the large-diameter roller 50 between the boss members 20, 30 as in the present embodiment also contributes to preventing the large-diameter roller 50 from falling off from the omni wheel.

Further, the large-diameter roller support portions 74 and 84 of the base end portions 73 and 83 are disposed in the concave portion 55 of the large-diameter roller 50, and the weakest portion of the base end portions 73 and 83 is disposed in the concave portion 55. In the present embodiment, the weakest portion is a portion of the base end side portions 73 and 83 having the smallest cross-sectional area. With this configuration, in the case where the base end side portions 73, 83 are broken by an unexpected load, it is advantageous to prevent the large-diameter roller 50 from falling off from the omni wheel.

Description of the reference numerals

1 Omnidirectional wheel

10 axle

20. 30 hub parts (rotating part)

40 minor diameter roller (first roller)

40a hole

41 core member

43 shaft

50 big diameter roller (second roller)

50b bolt component

51 core component

53 shaft

60 support part

61 mounted part

70 first arm member, first arm

71 minor-diameter roll support

72 first mounted part

73 base end side part

73a central part

73b end portion

74 major diameter roller support

75 connecting part

80 second arm member, second arm

81 minor-diameter roll support part

82 second mounted part

83 base end side part

83a central part

83b end portion

84 major diameter roller support

85 connecting part

90 chamfer (fastening part)

91 first plane part

92 second plane part

93 curved surface part

94 screw thread part

95 bolt part

96 wells

97 fixing part

RL, RL1, RL2 axis of rotation.