阅读说明：本技术 旋转传递装置 (Rotation transmission device ) 是由 佐藤光司 石川慎太朗 藤川雅道 于 2018-12-27 设计创作，主要内容包括：本发明涉及旋转传递装置,其具备在壳体(3)内对第一轴(1)与第二轴(2)进行卡合以及卡合解除的双向离合器(10)和电磁离合器(50)。旋转传递装置具备：滚动轴承(60),配置于壳体(3)的轴向一端部并支承第二轴(2)与壳体(3)；锁止单元(74、76、71、77),将第二轴(2)与滚动轴承(60)及滚动轴承(60)与壳体(3)固定为不在轴向上移动；以及移动限制单元(84),配置于壳体(3)的轴向另一端部并限制电磁离合器(50)向轴向另一端侧的移动。(The present invention relates to a rotation transmission device, which is provided with a bidirectional clutch (10) and an electromagnetic clutch (50) that engage and disengage a first shaft (1) and a second shaft (2) in a housing (3). The rotation transmission device is provided with: a rolling bearing (60) which is disposed at one axial end of the housing (3) and supports the second shaft (2) and the housing (3); locking units (74, 76, 71, 77) that fix the second shaft (2) and the rolling bearing (60) and the housing (3) so as not to move in the axial direction; and a movement restriction means (84) which is disposed at the other end in the axial direction of the housing (3) and which restricts the movement of the electromagnetic clutch (50) to the other end in the axial direction.)

1. A rotation transmission device is provided with: a bidirectional clutch (10) that engages and disengages a first shaft (1) and a second shaft (2) that are coaxially arranged within a housing (3); and an electromagnetic clutch (50) for controlling the engagement and disengagement of the bidirectional clutch (10),

the bidirectional clutch (10) is provided with:

an inner member (13) provided on one of the first shaft (1) and the second shaft (2);

an outer member (11) provided on the other of the first shaft (1) and the second shaft (2);

an engaging piece (15) which is inserted between the inner member (13) and the outer member (11); and

a holder (16) for holding the engaging piece (15),

the electromagnetic clutch (50) controls engagement and disengagement of the bidirectional clutch (10) by energizing and de-energizing an electromagnet (53) provided in the electromagnetic clutch (50),

the rotation transmission device includes:

a rolling bearing (60) disposed at one axial end of the housing (3) and rotatably supporting the second shaft (2) and the housing (3);

locking units (74, 76, 71, 77) that respectively fix the second shaft (2) and the rolling bearing (60), and the rolling bearing (60) and the housing (3) so as not to move in the axial direction; and

and a movement restriction means (84) which is disposed at the other end in the axial direction of the housing (3) and which restricts the movement of the electromagnetic clutch (50) to the other end in the axial direction.

2. The rotation transfer device according to claim 1,

the housing (3) is provided with:

a cylindrical portion (5) that houses the bidirectional clutch (10) and the electromagnetic clutch (50); and

a bearing sleeve (4) which is provided on one axial end side of the cylindrical section (5) and has a smaller diameter than the cylindrical section (5),

the rolling bearing (60) is arranged in the bearing cylinder (4),

the locking means (74, 76) is a first retainer ring (74) provided on the inner periphery of the bearing cylinder (4) and a second retainer ring (76) provided on the outer periphery of the second shaft (2) in order to hold one end side in the axial direction of the rolling bearing (60).

3. The rotation transfer device according to claim 2,

the locking means (71, 77) is a protruding portion (71) provided on the inner periphery of the bearing cylinder (4) and a stepped portion (77) provided on the outer periphery of the second shaft (2) in order to hold the other end side in the axial direction of the rolling bearing (60).

4. The rotation transmission device according to any one of claims 1 to 3,

the movement limiting means (84) is provided with a movement limiting collar (83) provided on the inner periphery of the other end portion in the axial direction of the housing (3).

5. The rotation transmission device according to any one of claims 1 to 3,

the movement limiting means (84) is provided with a movement limiting elastic member (82), and the movement limiting elastic member (82) is locked to the inner periphery of the other end portion in the axial direction of the housing (3) and biases the electromagnetic clutch (50) to one end side in the axial direction.

6. The rotation transmission device according to any one of claims 1 to 3,

the movement restriction means (84) is provided with:

a movement-restricting retainer ring (83) provided on the inner periphery of the other end portion in the axial direction of the housing (3); and

and a movement-restricting elastic member (82) that is provided between the movement-restricting retainer ring (83) and the electromagnetic clutch (50) and that biases the electromagnetic clutch (50) toward one axial end side.

Technical Field

The present invention relates to a rotation transmission device capable of switching between transmission and disconnection of rotation.

Background

As a rotation transmission device that transmits and disconnects rotation from a drive shaft to a driven shaft, a rotation transmission device that includes a bidirectional clutch and controls engagement and disengagement of the bidirectional clutch by an electromagnetic clutch has been known.

For example, in a rotation transmission device described in patent document 1, a control cage and a rotary cage are incorporated between an outer ring and an inner ring incorporated inside the outer ring such that column portions formed in the cages are alternately arranged in a circumferential direction. A pair of opposing rollers are fitted into pockets formed between circumferentially adjacent pillar portions of the control cage and the rotary cage. The pair of rollers facing each other are urged in a direction of separation by an elastic member interposed between the facing portions so as to stand by at positions engaged with a cylindrical surface formed on the inner periphery of the outer ring and a cam surface formed on the outer periphery of the inner ring, and rotation of the inner ring in one direction causes one of the rollers to be engaged with the cylindrical surface and the cam surface, thereby transmitting rotation of the inner ring to the outer ring.

The flange provided to the control holder and the flange provided to the rotary holder are supported to be slidable in the axial direction along a slide guide surface formed on the outer periphery of the input shaft. Further, the thrust bearing is incorporated between the flange of the rotary holder and the support ring fitted to the input shaft. The torque cam is disposed between the flange of the control holder and the flange of the rotary holder. The torque cam is configured such that balls are fitted into cam grooves formed between facing surfaces of a flange of the control holder and a flange of the rotary holder. The cam groove is formed to be deep in the center portion in the circumferential direction and gradually becomes shallow as going toward both ends.

The electromagnetic clutch is disposed on an input shaft connected to the inner ring. The control holder is integrally connected to an armature disposed opposite to a rotor of the electromagnetic clutch.

When the electromagnetic coil of the electromagnetic clutch is energized in the engaged state of the bidirectional clutch, attraction force acts on the armature disposed opposite to the rotor of the electromagnetic clutch, and the armature moves in the axial direction and is attracted to the rotor. At this time, the control holder moves in a direction in which the flange approaches the flange of the rotary holder as the armature moves in the axial direction. Thus, the torque cam moves the ball to the deepest position of the groove depth of the cam groove, and the control cage and the rotary cage rotate relative to each other in a direction in which the circumferential width of the pocket decreases. Thus, the pair of opposed rollers are pressed by the column portion of the control holder and the column portion of the rotary holder and moved toward the neutral position, and therefore, the rollers are in a disengaged state with respect to the cylindrical surface and the cam surface, and are in a state in which the transmission of rotation from the inner ring to the outer ring is interrupted, that is, a so-called free rotation state.

When the energization of the electromagnetic coil is released in a freely rotatable state of the inner ring, the attraction of the armature is released to be rotatable. By this adsorption release, the control retainer and the rotary retainer are relatively rotated in the direction in which the circumferential width of the pocket is increased by the pressing of the elastic member. Thus, the pair of opposed rollers are in a standby state of being engaged with the cylindrical surface and the cam surface, respectively, and can transmit rotation from the inner ring to the outer ring via one of the pair of opposed rollers.

Patent document 1: japanese patent laid-open No. 2014-40912

In the rotation transmission device described in patent document 1, an elastic member (for example, a wave spring) is incorporated into a bearing sleeve provided at one end of a housing so as not to cause a built-in member constituting a bidirectional clutch or an electromagnetic clutch to shake in an axial direction within the housing. The built-in member is urged toward a retainer ring provided on an inner periphery of the other end portion of the housing by the elastic member. This eliminates the need for adjustment of backlash by assembling a spacer, which has been conventionally required, and thus makes it possible to simplify assembly of the rotation transmission device and reduce cost.

However, the axial dimension (spring installation height) of the elastic member for preventing the rattling of the built-in member at the time of normal installation is defined by the axial dimension of the housing (axial dimension between the locking portion of the retainer ring and the locking portion of the elastic member), the axial thickness of the retainer ring, and the axial dimension of the built-in member (subassembly dimension, that is, the axial dimension between the contact surface with the retainer ring and the contact surface with the elastic member). Therefore, considering the respective tolerances, there is a problem that the variation in the dimension of the spring mounting height is large and the variation in the spring load during mounting is also large.

Further, in order to prevent the internal components other than the housing and the retainer from moving relative to the housing and the retainer due to vibration, it is necessary to set the minimum load of the elastic member (the load acting on the elastic member when attached) to a predetermined value or more.

However, if the minimum load of the elastic member is increased, the upper limit of the load that can act on the elastic member during vibration or the like is increased, which is not preferable because an unnecessary radial load is input to the support bearing that supports the input shaft and the output shaft. The input of unnecessary radial loads to the support bearing may reduce the life of the bearing. Further, when a force in a direction of pulling the outer ring from the outside of the housing is input (for example, when the rotation transmission device is used in a steering device, a reaction force acting from the tire side to the rotation transmission device), the elastic member may be deformed by being pressed.

Disclosure of Invention

Therefore, an object of the present invention is to prevent a built-in component constituting a bidirectional clutch or an electromagnetic clutch from axially wobbling in a housing regardless of a load condition.

In order to solve the above problem, the present invention employs a rotation transmission device comprising: the rotation transmission device includes: a bidirectional clutch which engages and disengages a first shaft and a second shaft which are coaxially arranged in a housing; and an electromagnetic clutch that controls engagement and disengagement of the bidirectional clutch, the bidirectional clutch including: an inner member provided on one of the first shaft and the second shaft; an outer member provided on the other side; an engaging piece which is fitted between the inner member and the outer member; and a retainer that retains the engaging piece, wherein the electromagnetic clutch controls engagement and disengagement of the bidirectional clutch by energizing and de-energizing an electromagnet provided in the electromagnetic clutch, and the rotation transmission device includes: a rolling bearing disposed at one axial end of the housing and rotatably supporting the second shaft and the housing; a locking unit that fixes the second shaft and the rolling bearing, and the rolling bearing and the housing, respectively, so as not to move in the axial direction; and a movement restricting unit that is disposed at the other end portion in the axial direction of the housing and restricts movement of the electromagnetic clutch to the other end side in the axial direction.

Here, the following structure can be adopted: the housing includes: a cylindrical portion that accommodates the bidirectional clutch and the electromagnetic clutch; and a bearing cylinder which is provided on one axial end side of the cylindrical portion and has a smaller diameter than the cylindrical portion, wherein the rolling bearing is disposed in the bearing cylinder, and the locking means is a first bearing ring provided on an inner periphery of the bearing cylinder and a second bearing ring provided on an outer periphery of the second shaft for holding the one axial end side of the rolling bearing.

The following structure can be adopted: the locking means is a protruding portion provided on an inner periphery of the bearing cylinder and a stepped portion provided on an outer periphery of the second shaft for holding the other end side in the axial direction of the rolling bearing.

In each of the above embodiments, the following configuration may be adopted: the movement restricting means includes a movement restricting collar provided on an inner periphery of the other end portion in the axial direction of the housing.

In the above-described embodiments, the following configuration may be adopted: the movement restricting unit includes a movement restricting elastic member that engages with an inner periphery of the other end portion in the axial direction of the housing and biases the electromagnetic clutch toward one end side in the axial direction.

Further, in each of the above-described embodiments, a configuration may be adopted in which: the movement restriction means includes: a movement restriction stopper provided on an inner periphery of the other end portion in the axial direction of the housing; and a movement restricting elastic member that is provided between the movement restricting collar and the electromagnetic clutch and that biases the electromagnetic clutch toward one axial end side.

The present invention is provided with: a rolling bearing disposed at one axial end of the housing and rotatably supporting the second shaft and the housing; a locking unit that fixes the second shaft and the rolling bearing, and the rolling bearing and the housing, respectively, so as not to move in the axial direction; and a movement restricting unit that is disposed at the other end portion in the axial direction of the housing and restricts movement of the electromagnetic clutch to the other end side in the axial direction, so that the built-in components constituting the bidirectional clutch and the electromagnetic clutch can be prevented from wobbling in the axial direction in the housing regardless of a load condition.

Drawings

Fig. 1 is a vertical cross-sectional view showing an embodiment of a rotation transmission device according to the present invention.

Fig. 2 is a sectional view taken along line II-II of fig. 1.

Fig. 3 is an enlarged view of a main part of fig. 2.

Fig. 4 is a sectional view taken along line IV-IV of fig. 1.

Fig. 5 is a sectional view taken along line V-V of fig. 4.

Fig. 6 is a sectional view taken along line VI-VI of fig. 1.

Fig. 7A is a sectional view taken along line VII-VII of fig. 6.

Fig. 7B is a sectional view taken along line VII-VII of fig. 6.

Fig. 8 is an enlarged view of a main portion in the vicinity of one end in the axial direction of fig. 1.

Fig. 9 is an enlarged view of a main portion in the vicinity of the other end in the axial direction of fig. 1.

Fig. 10 is an enlarged view of a main part showing a modification of fig. 9.

Detailed Description

Hereinafter, embodiments of the present invention will be described with reference to the drawings. Fig. 1 shows an embodiment of a rotation transmission device according to the present invention. The rotation transmission device is provided with: a first shaft 1; a second shaft 2 disposed coaxially with the first shaft 1; a housing 3 covering shaft ends of the first shaft 1 and the second shaft 2; a bidirectional clutch 10 that is incorporated in the housing 3 and transmits and disconnects rotation between the first shaft 1 and the second shaft 2; and an electromagnetic clutch 50 for controlling engagement and disengagement of the bidirectional clutch 10.

The housing 3 includes: a cylindrical portion 5 that houses the bidirectional clutch 10 and the electromagnetic clutch 50; and a bearing sleeve 4 which is provided on one end side in the axial direction of the cylindrical portion 5 and has a diameter smaller than that of the cylindrical portion 5. A rolling bearing 60 with a seal is disposed in the bearing cartridge 4, and the second shaft 2 is rotatably supported by the bearing cartridge 4 via the rolling bearing 60.

The bidirectional clutch 10 includes: an inner member 13 provided to the first shaft 1; an outer member 11 provided to the second shaft 2; a roller 15 interposed between the inner member 13 and the outer member 11; and a holder 16 that holds the roller 15.

The outer member 11 is an annular member provided at the axial end of the second shaft 2 and having a cylindrical surface 12 on the inner periphery thereof. The inner member 13 is a shaft-like member or an annular member that is provided at the shaft end of the first shaft 1 and has a plurality of cam surfaces 14 formed on the outer periphery thereof in the circumferential direction. A pair of rollers 15 as engaging members and an elastic member 20 disposed between the opposing rollers 15 are incorporated between each of the plurality of cam surfaces 14 and the cylindrical surface 12, and the opposing pair of rollers 15 are held by a holder 16.

When the inner member 13 rotates in one direction around the shaft, one of the pair of rollers 15 is engaged with the cylindrical surface 12 and the cam surface 14, and the rotation of the inner member 13 is transmitted to the outer member 11, and when the inner member 11 rotates in the other direction, the other roller 15 is engaged with the cylindrical surface 12 and the cam surface 14, and the rotation of the inner member 13 is transmitted to the outer member 11.

Here, a small-diameter recess 17 is formed on the inner surface side of the closed end portion, i.e., one axial end portion of the outer member 11, and the shaft end portion of the first shaft 1 is rotatably supported by a bearing 18 fitted into the recess 17.

In this embodiment, the inner member 13 is formed integrally with the first shaft 1. As shown in fig. 2, the cam surface 14 formed on the outer periphery of the inner member 13 is formed by a pair of inclined surfaces 14a and 14b inclined in opposite directions, and a wedge-shaped space having narrow circumferential ends is formed between the cam surface and the cylindrical surface 12 of the outer member 11. A flat elastic member support surface 19 is provided between the pair of inclined surfaces 14a and 14b, and faces in a tangential direction of a circle around the axial center of the inner member 13. The elastic member 20 is supported by the elastic member supporting surface 19.

In this embodiment, the elastic member 20 is constituted by a coil spring. As shown in fig. 2 and 3, the elastic member 20 is inserted so as to be pressed between the pair of rollers 15. The pair of rollers 15 are biased in a direction of separating by the elastic member 20, and the pair of rollers 15 are disposed at a standby position where they engage with the cylindrical surface 12 and the cam surface 14.

The holder 16 is constituted by a control holder 16A and a rotary holder 16B. The control holder 16A includes the same number of column portions 22 as the cam surface 14 at the circumferential direction at equal intervals on the outer peripheral portion on one side of the annular flange 21. The control holder 16A has an arc-shaped elongated hole 23 formed between circumferentially adjacent column portions 22, and a cylindrical portion 24 provided on the outer periphery thereof in a direction opposite to the column portions 22. The rotary holder 16B includes the same number of column portions 26 as the cam surface 14 at equal intervals in the circumferential direction on the outer periphery of the annular flange 25.

The control holder 16A and the rotary holder 16B are a combination in which column portions 26 of the rotary holder 16B are inserted into the long holes 23 of the control holder 16A, and the column portions 22 and 26 are alternately arranged in the circumferential direction. Further, in this assembled state, the front end portions of the column portions 22 and 26 are disposed between the outer member 11 and the inner member 13, and the flange 21 of the control holder 16A and the flange 25 of the rotating holder 16B are assembled so as to be positioned between the support ring 28 fitted to the outer periphery of the first shaft 1 and the outer member 11.

By fitting the control cage 16A and the rotary cage 16B, as shown in fig. 2 and 3, a pocket 27 is formed between the pillar portion 22 of the control cage 16A and the pillar portion 26 of the rotary cage 16B. The pockets 27 are opposed to the cam surfaces 14 of the inner member 13 in the radial direction, and a pair of rollers 15 and the elastic member 20 are assembled in each pocket 27.

As shown in fig. 1, the flange 21 of the control holder 16A and the flange 25 of the rotary holder 16B are supported slidably along a slide guide surface 29 formed on the outer periphery of the first shaft 1. A thrust bearing 30 is incorporated between the flange 25 of the rotary holder 16B and a support ring 28 fitted to the first shaft 1. The thrust bearing 30 supports the rotary holder 16B to be rotatable with respect to the first shaft 1 in a state where the rotary holder 16B is prevented from moving toward the electromagnetic clutch 50.

Between the flange 21 of the control holder 16A and the flange 25 of the rotary holder 16B, a torque cam 40 is provided. As shown in fig. 6, 7A, and 7B, the torque cam 40 includes a pair of opposing cam grooves 41 and 42 that are deeper at the circumferential center portion and gradually shallower as they reach the circumferential ends, on the facing surfaces of the flange 21 of the control holder 16A and the flange 25 of the rotary holder 16B. Further, a ball 43 is incorporated between one end of one cam groove 41 and the other end of the other cam groove 42.

When the control holder 16A moves in the axial direction in the direction in which the flange 21 of the control holder 16A approaches the flange 25 of the rotary holder 16B, the torque cam 40 moves the balls 43 in a rolling manner toward the positions where the groove depths of the cam grooves 41 and 42 are deepest, and rotates the control holder 16A and the rotary holder 16B relative to each other in the direction in which the circumferential width of the pocket 27 is reduced, as shown in fig. 7A.

A cylindrical holder fitting surface 32 having a larger diameter than the slide guide surface 29 is formed at the intersection of the slide guide surface 29 and the end surface of the inner member 13 on the other end side in the axial direction. A spring holder 33 is fitted to the holder fitting surface 32. The spring holder 33 is held between a retainer ring 35 attached to the holder fitting surface 32 and one end surface in the axial direction of the inner member 13 so as to be prevented from rotating relative to the first shaft 1 and is supported so as not to move (immovable) in the axial direction.

A positioning piece 36 is provided on the outer periphery of the spring holder 33, and the positioning piece 36 is disposed inside each of the pockets 27 provided in the retainer 16. The positioning piece 36 receives the column portion 22 of the control holder 16A and the column portion 26 of the rotation holder 16B at both circumferential edges, thereby holding the pair of rollers 15 at a neutral position and preventing the rollers 15 from moving toward the other axial end side of the inner member 13. As shown in fig. 5, the positioning piece 36 is provided with a spring support piece 37, and the spring support piece 37 prevents the elastic member 20 from moving radially outward.

A washer 45 is fitted to an end portion of the first shaft 1 on one axial end side. The spacer 45 is held in contact with the bearing 18 at the shaft end of the first shaft 1 at the end face of the stepped portion at the one end side in the axial direction of the inner member 13, and prevents the roller 15 from moving toward the one end side in the axial direction of the inner member 13.

The electromagnetic clutch 50 includes: an armature 51 axially opposed to an end surface of the cylindrical portion 24 formed in the control holder 16A; a rotor 52 axially opposed to the armature 51; and an electromagnet 53 axially opposed to the rotor 52.

The armature 51 is fitted into the cylindrical outer diameter surface 54 of the support ring 28, is rotatably supported, and is slidable in the axial direction. The cylindrical portion 24 of the control holder 16A is press-fitted into an inner diameter surface of a coupling cylinder 55 provided on an outer peripheral portion of the armature 51, and the control holder 16A and the armature 51 are coupled and integrated. By this connection, the armature 51 is supported slidably in the axial direction at two positions in the axial direction, namely, the cylindrical outer diameter surface 54 of the support ring 28 and the slide guide surface 29 on the outer periphery of the first shaft 1.

Here, the support ring 28 is positioned in the axial direction by a stepped portion 38 formed at the other end in the axial direction of the slide guide surface 29 of the first shaft 1. Alternatively, the rotor 52 may be positioned in the axial direction by inserting a spacer between the support ring 28 and the rotor 52. The support ring 28 is formed of a non-magnetic body. The nonmagnetic material may be a nonmagnetic metal or a resin.

The electromagnetic clutch 50 includes an electromagnet 53. The electromagnet 53 is energized and de-energized to rotate the control holder 16A and the rotation holder 16B relative to each other, thereby controlling engagement and disengagement of the bidirectional clutch 10.

The electromagnet 53 includes an electromagnetic coil 53a and an iron core 53b supporting the electromagnetic coil 53 a. The core 53b is fitted in the other end opening 6 of the housing 3, and is prevented from falling off by the movement restricting means 84 provided in the other end opening 6 of the housing 3, and is restricted from moving toward the other end side in the axial direction. That is, the movement restricting means 84 is disposed at the other end portion in the axial direction of the housing 3, and functions to restrict the movement of the electromagnetic clutch 50 to the other end side in the axial direction. The core 53b is rotatably provided relative to the first shaft 1 via a bearing 80 fitted to the first shaft 1. The bearing 80 is retained in the housing 3 by a retainer 81.

The seal member 7 is fitted into the bearing cartridge 4 at one end in the axial direction of the rolling bearing 60, thereby sealing a gap with the outer periphery of the second shaft 2. Further, the bearing cartridge 4 includes locking units 74, 76, 71, and 77 that fix the second shaft 2 and the rolling bearing 60, and the rolling bearing 60 and the housing 3, respectively, so as not to move in the axial direction. The second shaft 2, the rolling bearing 60, and the housing 3 are supported by the locking units 74, 76, 71, and 77 so as not to move (immovable) in the axial direction.

In this embodiment, as the rolling bearing 60, as shown in fig. 8, a deep groove ball bearing in which balls 63 are arranged as rolling elements between an outer ring 61 and an inner ring 62 is used. The bearing space between the outer race 61 and the inner race 62 is sealed on both axial sides by seals 64, 65.

The locking units 74 and 76 provided on one axial end side with the rolling bearing 60 interposed therebetween are configured by a first retainer ring 74 provided on the inner periphery of the bearing cartridge 4 and a second retainer ring 76 provided on the outer periphery of the second shaft 2 in order to hold the outer ring 61 and the inner ring 62 of the rolling bearing 60 on one axial end side.

The locking units 71 and 77 provided on the other axial end side with the rolling bearing 60 interposed therebetween are configured by a protruding portion 71 provided on the inner periphery of the bearing cylinder 4 and a stepped portion 77 provided on the outer periphery of the second shaft 2 in order to hold the outer ring 61 and the inner ring 62 of the rolling bearing 60 on the other axial end side.

The rotation transmitting device shown in this embodiment is constituted by the above-described configuration. Hereinafter, the operation of the rotation transmission device will be described. Here, the first shaft 1 is set as an input side of rotation, and the second shaft 2 is set as an output side of rotation.

In the off state in which the electromagnetic coil 53a of the electromagnetic clutch 50 is energized, the roller 15 of the bidirectional clutch 10 is engaged with the cylindrical surface 12 of the outer member 11 and the cam surface 14 of the inner member 13. Therefore, when the first shaft 1 rotates in one direction around the shaft, the rotation is transmitted from the inner member 13 to the outer member 11 through one of the pair of rollers 15, and the second shaft 2 rotates in the same direction as the first shaft 1. When the first shaft 1 rotates in the opposite direction around the shaft, the rotation is transmitted in the same direction to the second shaft 2 via the other roller 15.

When the electromagnetic coil 53a of the electromagnetic clutch 50 is energized in this engaged state of the bidirectional clutch 10, an attractive force acts on the armature 51, and the armature 51 moves in the axial direction and is attracted to the rotor 52. Fig. 1 shows this adsorption state. At this time, the armature 51 and the control holder 16A are coupled and integrated by fitting the coupling cylinder 55 and the cylindrical portion 24, and therefore, the control holder 16A moves in a direction in which the flange 21 approaches the flange 25 of the rotary holder 16B as the armature 51 moves in the axial direction.

By the relative movement of the control holder 16A and the rotary holder 16B, as shown in fig. 7A, the balls 43 of the torque cam 40 are rollingly moved toward the deepest positions of the groove depths of the cam grooves 41, 42, and the control holder 16A and the rotary holder 16B are relatively rotated in a direction in which the circumferential width of the pocket 27 is reduced. By the relative rotation of the control holder 16A and the rotary holder 16B, the pair of rollers 15 are pressed by the column portions 22 and 26 of the control holder 16A and the rotary holder 16B to move toward the neutral position. Fig. 2 shows a neutral state.

As described above, when the pair of rollers 15 are disengaged from the cylindrical surface 12 and the wheel surface 14 and the control retainer 16A and the rotary retainer 16B are relatively rotated from the disengaged state in a direction in which the circumferential width of the pocket 27 is further reduced, the column portions 22 and 26 of the retainers 16A and 16B come into contact with both side edges of the positioning piece 36 of the spring holder 33 shown in fig. 4. By this contact, the control holder 16A and the rotary holder 16B are in a stopped state, and the pair of rollers 15 are held in an engagement released state. Therefore, even if the first shaft 1 rotates, the rotation is not transmitted to the second shaft 2, and the first shaft 1 freely rotates.

In this freely rotating state, when the energization of the electromagnetic coil 53a is released, the attraction of the armature 51 is released and the rotation becomes freely. By this adsorption release, the control retainer 16A and the rotary retainer 16B are relatively rotated in the direction in which the circumferential width of the pocket 27 is increased by the pressing of the elastic member 20. By this relative rotation, the pair of rollers 15 are in a standby state of engaging with the cylindrical surface 12 and the cam surface 14, respectively, and a state of transmitting a rotational torque in one direction between the inner member 13 and the outer member 11 via one of the pair of rollers 15 is achieved. Here, when the rotation of the first shaft 1 is stopped and the rotation direction of the first shaft 1 is switched, the rotation of the inner member 13 is transmitted to the outer member 11 via the other roller 15. At this time, when the control cage 16A and the rotary cage 16B are relatively rotated in the direction in which the circumferential width of the pocket 27 is increased, the balls 43 of the torque cam 40 roll toward the shallow groove portions of the pair of cam grooves 41, 42, and the state shown in fig. 7B is achieved.

In the present invention, the second shaft 2, the rolling bearing 60, and the housing 3 are supported in a state of not moving (immovable) in the axial direction by the locking means 74, 76, 71, and 77 at one end portion in the axial direction of the housing 3, and the movement of the electromagnetic clutch 50 to the other end side in the axial direction is restricted by the movement restricting means 84 at the other end portion in the axial direction of the housing 3. Therefore, when the built-in components in the housing 3, that is, the structural components such as the bidirectional clutch 10 and the electromagnetic clutch 50 vibrate with respect to the housing 3, the load of the supporting load acting on the housing 3 due to the vibration is reduced. Therefore, the support structure of the structural members such as the bidirectional clutch 10 and the electromagnetic clutch 50 can be simplified.

Further, even if a reaction force from the second shaft 2 side (an external force in a direction of pulling the second shaft 2 out of the housing 3) acts on the outer member 11, the outer member 11 is fixed via the rolling bearing 60 and the movement restricting means 84 so as not to move in the axial direction with respect to the housing 3, and therefore, no load acts on other members, and the reliability of the apparatus can be improved.

In this embodiment, as the locking means 74, 76 provided on one end side in the axial direction with the rolling bearing 60 interposed therebetween, as shown in fig. 8, a first retainer ring 74 provided on the inner periphery of the bearing sleeve 4 and a second retainer ring 76 provided on the outer periphery of the second shaft 2 are used. Further, as the locking units 71, 77 provided on the other end side in the axial direction via the rolling bearing 60, a protruding portion 71 provided on the inner periphery of the bearing cylinder 4 and a stepped portion 77 provided on the outer periphery of the second shaft 2 are employed.

On the inner side of the bearing sleeve 4, the projection 71 integral with the member of the housing 3 and the step 77 integral with the second shaft 2 are used as means for restricting the movement of the rolling bearing 60 to the other end side in the axial direction, and therefore there is an advantage that the locking means 71, 77 can be molded at the same time when the housing 3 and the second shaft 2 are molded. Further, since the space inside the bearing cylinder 4 is small, the lock units 71 and 77 are integrally molded with the housing 3 and the second shaft 2, and the assembling work is easier than the case where the lock units 71 and 77 are formed by attaching other members such as a retainer ring to the inner periphery of the housing 3 and the outer periphery of the second shaft 2.

Here, in the present embodiment, the projecting portion 71 is a flange portion extending over the entire inner circumference of the bearing sleeve 4, and the stepped portion 77 is a shoulder portion provided on the entire outer circumference of the second shaft 2, but may be a projecting portion 71, a stepped portion 77, or the like arranged intermittently in the circumferential direction. Although the assembly is complicated as described above, other members such as a retainer ring may be attached to the inner periphery of the housing 3 and the outer periphery of the second shaft 2 to form the lock units 71 and 77.

Further, since the first retainer ring 74 provided on the inner periphery of the bearing sleeve 4 and the second retainer ring 76 provided on the outer periphery of the second shaft 2 are used as means for restricting the movement of the rolling bearing 60 to one end side in the axial direction on the opening side in the bearing sleeve 4, the rolling bearing 60 can be easily locked near the opening in the bearing sleeve 4 which can be reached by hand.

These locking units 74, 76, 71, and 77 can prevent the relative movement of the rolling bearing 60 in the axial direction with respect to the housing 3 and the relative movement of the second shaft 2 in the axial direction with respect to the rolling bearing 60.

In this embodiment, as shown in fig. 8, as the first and second bearing rings 74 and 76, tapered rings 74a and 76a are used. The retaining ring is a C-shaped member in which one portion of the annular member is cut off, but the inclined surface type retaining rings 74a and 76a are provided with a tapered portion inclined in the axial direction toward either one of the radial directions on the axial side surfaces thereof. The tapered portions are denoted by reference numerals 74b, 76b in fig. 8. The tapered portion 74b of the first retainer ring 74 on the radially outer side is gradually inclined toward the other end side in the axial direction as it goes to the radially outer side, and the tapered portion 76b of the second retainer ring 76 on the radially inner side is gradually inclined toward the other end side in the axial direction as it goes to the radially inner side.

The tapered portions 74b and 76b are in sliding contact with the inclined surface 72a of the groove 72 provided on the inner periphery of the bearing sleeve 4 and the inclined surface 73a of the groove 73 provided on the outer periphery of the second shaft 2, and the first and second bearing rings 74 and 76 are expanded or reduced in diameter within the radial gaps W1 and W2. Therefore, the end surfaces of the outer ring 61 and the inner ring 62 of the rolling bearing 60 can be constantly pressed toward the one axial end side, and the housing 3 and the rolling bearing 60, and the rolling bearing 60 and the second shaft 2 can be more reliably locked.

In the present embodiment, as shown in fig. 1 and 9, the movement restricting unit 84 includes a movement restricting collar 83 provided on the inner periphery of the other end portion in the axial direction of the housing 3, and a movement restricting elastic member 82 provided between the movement restricting collar 83 and the electromagnetic clutch 50 and urging the electromagnetic clutch 50 toward one end side in the axial direction. As the movement restricting elastic member 82, various spring members such as a wave spring, a disc spring, and a coil spring can be used.

Here, the movement restricting elastic member 82 may be omitted, and the movement restricting means 84 may be constituted by only the movement restricting collar 83 provided on the inner periphery of the other end portion in the axial direction of the housing 3. The movement restricting collar 83 is pressed against the iron core 53b of the electromagnetic clutch 50, and thereby can restrict the movement of the electromagnetic clutch 50 to the other axial end side.

As another example, as shown in fig. 10, the movement restricting means 84 may be constituted by a movement restricting elastic member 82 that is locked to the inner periphery of the other end portion in the axial direction of the housing 3 and biases the electromagnetic clutch 50 toward one end in the axial direction. According to this example, the labor for fixing other members such as the retainer ring to the housing 3 can be omitted. The movement restricting elastic member 82 may be locked to a groove 83a formed in the inner periphery of the housing 3, or may be locked to a projection formed integrally with the inner periphery of the housing 3.

Here, as described above, the axial dimensional tolerance of the rolling bearing 60 is not included in the variation in the mounting height of the movement restricting elastic member 82, and therefore, the variation in the load of the movement restricting elastic member 82 can be suppressed.

In this embodiment, the present invention has been described with the first shaft 1 being the input side of rotation and the second shaft 2 being the output side of rotation, but the second shaft 2 may be the input side of rotation and the first shaft 1 may be the output side of rotation.

In the rotation transmission device according to this embodiment, a roller type is shown in which the control holder 16A and the rotation holder 16B are relatively rotated by energizing and releasing the electromagnet 53 and moving the control holder 16A in the axial direction as the bidirectional clutch 10, and the roller 15 as the engaging member is engaged with the inner periphery of the outer member 11 and the outer periphery of the inner member 13, but the bidirectional clutch is not limited to this. For example, the stopper type may be one in which a pair of retainers having different diameters are arranged inside and outside, an outer retainer having a larger diameter is formed of a control retainer and a rotary retainer, an electromagnet of an electromagnetic clutch is energized and released, a pair of stoppers as engaging pieces are engaged with an inner circumferential cylindrical surface of the outer member and an outer circumferential cylindrical surface of the inner member by an elastic member interposed between the opposing portions, and the electromagnet is energized to rotate the control retainer and the rotary retainer relative to each other, thereby releasing the engagement of the pair of stoppers.

Description of the reference numerals

1 … first shaft; 2 … second shaft; 3 … a housing; 4 … bearing cartridge; 5 … cylindrical part; 6 … shell opening; 10 … two-way clutch; 11 … outer part; 13 … inner part; 15 … roller (snap); 16 … a retainer; 16a … control holder; 16B … rotary holder; 50 … electromagnetic clutch; 53 … electromagnet; 60 … rolling bearing; 74. 76, 71, 77 … lock unit; 84 … move the restraining element.