阅读说明：本技术 防松件、防松机构、固定装置、紧固构造以及产业机械
(Anti-loosening member, anti-loosening mechanism, fixing device, fastening structure, and industrial machine
) 是由 王宏猷
中村江児
增田智彦
赤尾正贵 于 2019-08-08 设计创作，主要内容包括：本发明提供一种防松件、防松机构、固定装置、紧固构造以及产业机械。防松件(70)具有环状的接触部(71),该环状的接触部(71)以与螺栓(B)的头部(HP)以及凹部(RP)的壁部(WP)接触的方式配置于用于收纳螺栓(B)的头部(HP)的凹部(RP)内。(The invention provides a locking member, a locking mechanism, a fixing device, a fastening structure and an industrial machine. The anti-loosening element (70) has an annular contact portion (71), and the annular contact portion (71) is disposed in the Recess (RP) for receiving the Head (HP) of the bolt (B) so as to be in contact with the Head (HP) of the bolt (B) and the Wall (WP) of the Recess (RP).)
1. An anti-loosening element, wherein,
the lock includes an annular contact portion disposed in contact with a head portion of a bolt and a wall portion of a housing portion for housing the head portion.
2. The anti-release member according to claim 1,
the check member has a top portion connected to the contact portion,
the top portion has a protrusion disposed in a prism hole provided in the head portion.
3. The check member according to claim 2,
the anti-loosening piece is provided with a threaded hole penetrating through the convex part.
4. The anti-release member according to claim 1,
the anti-loosening member is provided with a top portion connected with the contact portion and provided with a threaded hole.
5. The anti-release member according to any one of claims 1 to 4,
the check member restricts rotation of the bolt by friction between the head portion of the bolt and the contact portion.
6. A locking mechanism, wherein,
the anti-loosening mechanism comprises:
a 1 st member having a through hole connected to a recess for receiving a head of a bolt and through which the bolt passes; and
and an anti-loosening member having an annular contact portion disposed in the recess so as to contact the head portion of the bolt and a wall portion of the recess.
7. A fastening structure, wherein,
the fastening structure includes:
a bolt;
a 1 st member having a through hole connected to a recess for receiving a head of the bolt and through which the bolt passes;
a 2 nd member having a screw hole engaged with the bolt passed through the through hole; and
and an anti-loosening member having an annular contact portion disposed in the recess so as to contact the head portion of the bolt and a wall portion of the recess.
8. The fastening construction according to claim 7,
the anti-loosening member has a top portion connected to the contact portion and provided with a threaded hole,
the fastening structure is provided with a screw member engaged with the screw hole of the top portion.
9. The fastening construction according to claim 7,
the locking piece is arranged inside the concave part.
10. The fastening construction according to claim 7,
the head of the bolt has a cylindrical shape.
11. An anti-loosening element, wherein,
the check member has a 2 nd screw thread engaged with a 1 st screw thread provided in a recess for receiving a head of the bolt.
12. The check member of claim 11,
the retainer has the 2 nd screw on an outer peripheral surface thereof and a ridge hole at a position that is a center of the outer peripheral surface.
13. A locking mechanism, wherein,
the anti-loosening mechanism comprises:
a 1 st member having a through hole connected to a recess for receiving a head of a bolt and through which the bolt passes; and
and an anti-loosening member having a 2 nd thread engaged with the 1 st thread provided in the recess.
14. A fastening structure, wherein,
the fastening structure includes:
a bolt;
a 1 st member having a through hole connected to a recess for receiving a head of the bolt and through which the bolt passes;
a 2 nd member having a screw hole engaged with the bolt passed through the through hole; and
and an anti-loosening member having a 2 nd thread engaged with the 1 st thread provided in the recess.
15. The fastening construction according to claim 14,
the anti-loosening element and the bolt are in opposite threaded relation.
16. The fastening construction according to claim 14,
the pitch of the 2 nd thread of the looseness prevention member is shorter than the pitch of the bolt.
17. The fastening construction according to claim 14,
the locking piece is arranged inside the concave part.
18. An anti-loosening element, wherein,
the loosening prevention member is attached to the 1 st bolt and the 2 nd bolt so as to restrict relative rotation with the 1 st bolt and the 2 nd bolt.
19. A fixing device, wherein,
the fixing device is provided with:
the 1 st bolt and the 2 nd bolt; and
and a loosening prevention member attached to each of the 1 st bolt and the 2 nd bolt so as to restrict relative rotation between the loosening prevention member and the 1 st bolt and the 2 nd bolt.
20. A fastening structure, wherein,
the fastening structure includes:
the 1 st bolt and the 2 nd bolt;
a 1 st member having a through hole through which the 1 st bolt and the 2 nd bolt pass;
a 2 nd member having a 1 st threaded hole engaged with the 1 st bolt and a 2 nd threaded hole engaged with the 2 nd bolt; and
and a loosening prevention member attached to each of the 1 st bolt and the 2 nd bolt so as to restrict relative rotation between the loosening prevention member and the 1 st bolt and the 2 nd bolt.
21. The fastening construction according to claim 20,
a notch portion is provided at a head portion of the 1 st bolt and a head portion of the 2 nd bolt, and the loosening prevention member is disposed at the notch portion.
22. The fastening construction according to claim 20,
the anti-loosening member has: a base; a 1 st projection projecting from the base and disposed in a rib hole provided in a head of the 1 st bolt; and a 2 nd projection projecting from the base and disposed in a ridge hole provided in a head of the 2 nd bolt.
23. The fastening construction according to claim 20,
the 1 st member is provided with a single recess for receiving the head of the 1 st bolt and the head of the 2 nd bolt,
the locking piece is arranged inside the concave part.
24. The fastening structure according to any one of claims 7 to 10, 14 to 17, and 20 to 23,
one of the 1 st member and the 2 nd member is a speed reducer.
25. The fastening structure according to any one of claims 7 to 10, 14 to 17, and 20 to 23,
the 1 st member is the 1 st portion of the carrier of the reducer,
the 2 nd member is the 2 nd portion of the carrier of the speed reducer.
26. An industrial machine, wherein,
the industrial machine includes the fastening structure according to any one of claims 7 to 10, 14 to 17, and 20 to 23.
Technical Field
The present invention relates to a loosening prevention tool for preventing loosening of a bolt, a loosening prevention mechanism, a fixing device for fixing two members, a fastening structure, and an industrial machine.
Background
A method of fastening two members using a bolt is widely implemented in various fields. As an example, a reduction gear of an eccentric oscillation type or the like (JP2017-65301A) is fastened with a member that outputs rotation from the reduction gear using a bolt. The output of the reduction gear continues to increase due to the demand for high-speed driving, and the force applied to each bolt increases accordingly. If the force applied to the bolt is increased, the bolt is likely to loosen.
Disclosure of Invention
The present invention has been made in view of the above points, and an object thereof is to provide a loosening prevention tool for preventing loosening of a bolt, a loosening prevention mechanism including the loosening prevention tool, a fixing device, a fastening structure, and an industrial machine.
The first lock of the present invention includes an annular contact portion disposed in contact with a head portion of a bolt and a wall portion of a receiving portion for receiving the head portion.
In the 1 st anti-loosening element according to the present invention, the contact portion may have a static friction coefficient larger than that of the head portion and larger than that of the wall portion.
In the 1 st anti-release member of the present invention, it is also possible,
the 1 st locking member has a top portion connected to the contact portion,
the top portion has a protrusion disposed in a prism hole provided in the head portion.
In the 1 st locking element according to the present invention, the 1 st locking element may be provided with a screw hole penetrating the projection.
In the 1 st loosening prevention element according to the present invention, the convex portion may be press-fitted into the ridge hole of the bolt.
The 1 st locking member of the present invention may be provided with a top portion connected to the contact portion and provided with a screw hole.
In the 1 st loosening prevention element according to the present invention, a surface of the contact portion that contacts the head may be a cylindrical inner circumferential surface.
The 1 st locking member of the present invention may be configured to restrict rotation of the bolt by friction between the head portion of the bolt and the contact portion.
The 1 st locking mechanism of the present invention comprises:
a 1 st member having a through hole connected to a recess for receiving a head of a bolt and through which the bolt passes;
and a lock having an annular contact portion disposed in the recess so as to contact the head of the bolt and a wall of the recess.
The 1 st fastening structure of the present invention includes:
a bolt;
a 1 st member having a through hole connected to a recess for receiving a head of the bolt and through which the bolt passes;
a 2 nd member having a screw hole engaged with the bolt passed through the through hole; and
and an anti-loosening member having an annular contact portion disposed in the recess so as to contact the head portion of the bolt and a wall portion of the recess.
In the 1 st fastening structure of the present invention, the loosening prevention member may have a tip portion connected to the contact portion and provided with a screw hole,
the 1 st fastening structure of the present invention includes a screw member engaged with the screw hole of the crest portion.
In the 1 st fastening structure of the present invention, the screw member may be capable of contacting the head of the bolt by engaging with the threaded hole of the head.
In the 1 st fastening structure of the present invention, the stopper may be disposed inside the recess.
In the 1 st fastening structure of the present invention, the head portion of the bolt may have a cylindrical outer shape.
The 2 nd check member of the present invention has a 2 nd screw thread engaged with a 1 st screw thread provided in a recess for receiving a head of a bolt.
The 3 rd loosening prevention member of the present invention is fixed to a recess for receiving a head of a bolt and contacts the head, thereby restricting rotation of the bolt.
In the 2 nd or 3 rd locking member of the present invention, the locking member may be pressed into the recess.
In the 2 nd loosening prevention element or the 3 rd loosening prevention element according to the present invention, the thread may be provided on an outer circumferential surface, and a ridge hole may be provided at a position that becomes a center of the outer circumferential surface.
The 2 nd loosening prevention mechanism of the present invention includes:
a 1 st member having a through hole connected to a recess for receiving a head of a bolt and through which the bolt passes;
and a locking member having a 2 nd thread engaged with the 1 st thread provided in the recess.
The 3 rd loosening prevention mechanism of the present invention comprises:
a 1 st member having a through hole connected to a recess for receiving a head of a bolt and through which the bolt passes;
and a check member fixed to the recess and contacting the head to restrict rotation of the bolt.
The 2 nd fastening structure of the present invention includes:
a bolt;
a 1 st member having a through hole connected to a recess for receiving a head of the bolt and through which the bolt passes;
a 2 nd member having a screw hole engaged with the bolt passed through the through hole; and
and an anti-loosening member having a 2 nd thread engaged with the 1 st thread provided in the recess.
The 3 rd fastening structure of the present invention includes:
a bolt;
a 1 st member having a through hole connected to a recess for receiving a head of the bolt and through which the bolt passes;
a 2 nd member having a screw hole engaged with the bolt passed through the through hole; and
an anti-loosening member fixed to the recess and contacting the head to restrict rotation of the bolt.
In the 2 nd fastening structure or the 3 rd fastening structure of the present invention, the loosening prevention member and the bolt may have a reverse thread direction relationship.
In the 2 nd fastening structure or the 3 rd fastening structure of the present invention, a pitch of the 2 nd thread of the loosening prevention member may be shorter than a pitch of the bolt.
In the 2 nd fastening structure or the 3 rd fastening structure of the present invention, the stopper may be disposed inside the recess.
The 4 th loosening prevention member of the present invention is attached to the 1 st bolt and the 2 nd bolt so as to restrict relative rotation with the 1 st bolt and the 2 nd bolt.
The 1 st fixing device of the present invention includes:
the 1 st bolt and the 2 nd bolt; and
and a loosening prevention member attached to each of the 1 st bolt and the 2 nd bolt so as to restrict relative rotation between the loosening prevention member and the 1 st bolt and the 2 nd bolt.
The 4 th fastening structure of the present invention includes:
the 1 st bolt and the 2 nd bolt;
a 1 st member having a through hole through which the 1 st bolt and the 2 nd bolt pass;
a 2 nd member having a 1 st threaded hole engaged with the 1 st bolt and a 2 nd threaded hole engaged with the 2 nd bolt; and
and a loosening prevention member attached to each of the 1 st bolt and the 2 nd bolt so as to restrict relative rotation between the loosening prevention member and the 1 st bolt and the 2 nd bolt.
In the 4 th fastening structure of the present invention, a cutout portion may be provided in a head portion of the 1 st bolt and a head portion of the 2 nd bolt, and the loosening prevention member may be disposed in the cutout portion.
In the 4 th fastening structure of the present invention, the anti-loosening element may be press-fitted into the notch portion.
In the 4 th fastening structure of the present invention, the loosening prevention member may include: a base; a 1 st projection projecting from the base and disposed in a rib hole provided in a head of the 1 st bolt; and a 2 nd projection projecting from the base and disposed in a ridge hole provided in a head of the 2 nd bolt.
In the 4 th fastening structure according to the present invention, the 1 st projection may be press-fitted into the ridge hole of the 1 st bolt, and the 2 nd projection may be press-fitted into the ridge hole of the 2 nd bolt.
In the 4 th fastening structure of the present invention, the fastener may be,
the 1 st member is provided with a single recess for receiving the head of the 1 st bolt and the head of the 2 nd bolt,
the locking piece is arranged inside the concave part.
In the 1 st to 4 th fastening structures according to the present invention, one of the 1 st and 2 nd members may be a reduction gear.
In the 1 st to 4 th fastening structures of the present invention, it is also possible that,
the 1 st member is the 1 st portion of the carrier of the reducer,
the 2 nd member is the 2 nd portion of the carrier of the speed reducer.
The industrial machine of the present invention includes any one of the 1 st to 4 th fastening structures of the present invention described above.
According to the present invention, loosening of the bolt can be effectively prevented.
Drawings
Fig. 1 is a diagram for explaining an embodiment, and is a vertical cross-sectional view showing a reduction gear as an example of an application target of a fastening structure.
Fig. 2 is a sectional view taken along line II-II of fig. 1.
Fig. 3 is a perspective view showing an industrial machine including a fastening structure.
Fig. 4 is a cross-sectional view showing a fastening structure in the 1 st embodiment.
Fig. 5 is a cross-sectional view showing a fastening structure according to the 2 nd embodiment.
Fig. 6 is a plan view showing an example of the 3 rd aspect of the fastening structure.
Fig. 7 is a sectional view taken along line VII-VII of fig. 6.
Fig. 8 is a plan view showing another mode of the fastening structure of the 3 rd mode.
Fig. 9 is a sectional view along the IX-IX line of fig. 8.
Detailed Description
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Fig. 1 to 9 are diagrams for explaining an embodiment of the present invention. Hereinafter, an example in which the present embodiment is applied to a speed reducer, particularly an eccentric oscillating type speed reducer, will be described as an example. However, the present invention is not limited to the examples described below, and can be applied to various fastening products and the like fastened using bolts.
First, the overall structure of the eccentric rocking type reduction gear 10 will be described with reference to fig. 1 and 2. The speed reducer 10 includes: the housing 20, the carrier 30, the crankshaft 40, and the two external gears 50a, 50 b. The housing 20 has internal teeth 25. The crankshaft 40 is supported by the carrier 30 and drives the two external gears 50a and 50 b. In the reduction gear 10, the carrier 30 rotates relative to the case 20 about the rotation axis line RA by meshing the external teeth 55 of the external gears 50a, 50b with the internal teeth 25. Hereinafter, a direction parallel to the rotation axis RA is referred to as an axial direction DA, and a direction perpendicular to the rotation axis RA is referred to as a radial direction DR. The axial direction DA and the radial direction DR are orthogonal to the circumferential direction DC centered on the rotation axis RA.
The housing 20 has: a substantially cylindrical case main body 21; and an internal tooth pin 24 held to the inner surface of the housing main body 21. The housing main body 21 is formed with pin grooves arranged along the circumferential direction DC, extending in the axial direction DA, and receives and holds the internal gear pins 24 having a cylindrical shape. The internal tooth pins 24 extend in the axial direction DA, forming internal teeth 25.
The carrier 30 is held by the housing 20 so as to be rotatable about the rotation axis line RA via a pair of bearings 12. The carrier 30 has a carrier base portion (also referred to as "part 1") 31 and a plate portion (also referred to as "part 2") 32 that are fixed to each other by bolts 36. The central axis of the bolt 36 is parallel to the axial direction DA. The carrier base part 31 includes a disk-shaped base plate part 31a and a plurality of column parts 31b projecting from the base plate part 31 a. In the illustrated example, the base plate portion 31a and the plurality of pillar portions 31b are integrally formed. As shown in fig. 2, the plurality of pillar portions 31b are provided at equal intervals in the circumferential direction DC about the rotation axis RA. In the illustrated example, three column portions 31b are provided. The column portion 31b is formed with a screw hole 37 to be engaged with the bolt 36. The screw hole 37 opens at the distal end surface of the pillar portion 31 b. Further, the plate portion 32 is formed with a through hole 38 that penetrates so as not to engage with the bolt 36. A gap is left between the bolt 36 and the through hole 38.
The carrier base portion 31 and the plate portion 32 of the carrier 30 are respectively formed with a central hole 34 located on the rotation axis RA. The carrier 30 is formed with a through hole 35 that penetrates the carrier base part 31 and the plate part 32. The plurality of through holes 35 are provided in the carrier base portion 31 and the plate portion 32 at equal intervals in a circumferential direction DC about the rotation axis RA. In the illustrated example, three through holes 35 are provided in the carrier base part 31 and the plate part 32.
The bearings 13a and 13b are provided in the through hole 35 formed in the carrier base part 31 and the plate part 32. The crankshaft 40 is held rotatably with respect to the carrier 30 by a pair of bearings 13a and 13b provided in the axial direction. Furthermore, rotational axis RAC of crankshaft 40 is parallel to axial direction DA. The crankshaft 40 has an input gear 42 and two eccentric bodies 41a, 41b arranged in the axial direction DA. Each of the eccentric bodies 41a, 41b has a disc-like or cylindrical outer shape. Central axes CAa, Cab of both eccentric bodies 41a, 41b are eccentric symmetrically about rotation axis RAC of crankshaft 40.
The two external gears 50a, 50b are disposed in a space formed between the plate portion 31a and the plate portion 32 of the carrier base portion 31 of the carrier 30. The two external gears 50a, 50b are aligned along the axial direction DA. As shown in fig. 2, a central hole 51 is formed in each of the external gears 50a and 50 b. The external gears 50a and 50b have external teeth 55 aligned along the outer peripheral edge centered on the central hole 51. The number of teeth of the external teeth 55 is smaller (by way of example, only one) than the number of teeth of the internal teeth 25 of the housing 20. Further, the outer diameters of the external gears 50a, 50b are slightly smaller than the inner diameter of the housing 20.
Further, the external gears 50a and 50b are formed with eccentric body through holes 52a and 52b provided at equal intervals in the circumferential direction around the central hole 51. Bearings 13c and 13d are disposed in the eccentric body through holes 52a and 52b, respectively. The eccentric bodies 41a, 41b of the crankshaft 40 are held by the bearings 13c, 13 d.
Further, the external gears 50a and 50b are formed with column portion through holes 53a and 53b provided at equal intervals in the circumferential direction DC around the central hole 51. The post portion through holes 53a and 53b and the eccentric body through holes 52a and 52b are alternately arranged in the circumferential direction around the center hole 51 for each of the external gears 50a and 50 b. Each column portion 31b of the carrier base portion 31 passes through the corresponding column portion through hole 53a, 53b of the external gear 50a, 50 b.
In the reduction gear 10 having the above-described configuration, torque from the driving device 60 such as a motor is transmitted to the input gear 42. In the illustrated example, the input shaft 61 of the drive device 60 is engaged with the input gear 42 through the central hole 34 of the carrier 30 and the central holes 51 of the external gears 50a and 50 b. The input shaft 61 rotates about the rotation axis RA. When rotation is transmitted from drive device 60 to input gear 42, crankshaft 40 rotates about rotation axis RAC. At this time, the 1 st eccentric body 41a and the 2 nd eccentric body 41b eccentrically rotate. Further, the respective external gears 50a and 50b oscillate according to the eccentric rotation of the 1 st eccentric body 41a and the 2 nd eccentric body 41 b. More strictly speaking, the external gears 50a and 50b perform translational motion on a circular path around the rotation axis RA with respect to the carrier 30. When the external gears 50a and 50b oscillate, the external teeth 55 of the external gears 50a and 50b mesh with the internal teeth 25 of the housing 20. Since the number of teeth of the external teeth 55 is smaller than that of the internal teeth 25, the external gears 50a and 50b rotate in a wobbling manner with respect to the housing 20. That is, the external gears 50a and 50b further rotate about their central axes while revolving around the rotation axis RA. As a result, the carrier 30 supporting the external gears 50a and 50b via the crankshaft 40 also rotates about the rotation axis RA with respect to the housing 20. In this way, the rotation input from the input shaft 61 of the drive device 60 is decelerated and output as relative rotation between the casing 20 and the carrier 30.
The speed reducer 10 described above is incorporated into, for example, an industrial machine IM and used. More specifically, the reducer 10 can be used together with the drive device in a revolving unit such as a revolving body and a wrist joint of the robot 6, a revolving unit of various machine tools, and the like. As a specific example shown in fig. 3, by fixing the housing 20 to the base 6X of the robot 6 and connecting the carrier 30 to the revolving unit 6Y of the robot 6, the revolving unit 6Y can be rotated with high torque with respect to the base 6X, and the rotation of the revolving unit 6Y can be controlled with high accuracy.
As an example, the base 6X of the robot 6 has a screw hole that engages with a bolt inserted through the through hole 26 provided to the flange portion 22 of the housing main body 21. That is, the base 6X of the robot 6 and the case 20 of the reducer 10 can be fastened using bolts. The flange portion 22 protrudes from the housing main body 21 in the radial direction DR, and is formed in an annular shape as shown in fig. 2. The flange portion 22 is provided with a plurality of through holes 26 at equal intervals in the circumferential direction DC. The bolt is screwed into a screw hole formed in the base 6X by rotating about an axis parallel to the axial direction DA.
Further, a through hole through which, for example, a bolt is inserted is provided in revolving unit 6Y of robot 6. The carrier base 31 of the carrier 30 has screw holes 39 for engaging with bolts inserted through the through holes of the rotator 6Y. That is, the revolving unit 6Y of the robot 6 and the carrier 30 of the reduction gear 10 can be fastened using bolts. A plurality of screw holes 39, not shown, are provided in the base plate portion 31a of the carrier base 31, and the reduction gear 10 and the rotator 6Y are fixed by a plurality of bolts. Each bolt is screwed into a screw hole 39 formed in the carrier base 31 while rotating about an axis parallel to the axial direction DA.
However, as mentioned in the background section, the reduction gear 10 is required to have a high output, for example, for high-speed driving. In the case where the output from the speed reducer 10 is large, loosening is liable to occur in the bolt for fixing the speed reducer 10 and the robot 6, the bolt for assembling the speed reducer 10. If the bolt becomes loose, not only is there a problem in the power transmission by the speed reducer 10, but also damage occurs to the speed reducer 10 and the robot 6.
On the other hand, in the present embodiment, the stopper 70 for preventing loosening of the bolt B is incorporated into the fastening structure FS. Here, the fastening structure FS includes: a bolt B; a 1 st member M1 having a through hole TH through which a bolt B passes; a 2 nd member M2 having a screw hole SH to be engaged with the bolt B passed through the through hole TH; and a loosening prevention member 70 for preventing loosening of the bolt B. That is, in this fastening configuration FS, the 1 st member M1 and the 2 nd member M2 are fastened by the bolt B, and loosening of the bolt B is effectively prevented by the check 70.
As a specific 1 st application example, the fastening structure FS can be configured such that the speed reducer 10, particularly the housing 20 (flange portion 22), is the 1 st member M1, and the base 6X of the robot 6 is the 2 nd member M2. In addition, as a 2 nd application example, the fastening structure FS can be configured such that the plate portion (2 nd portion) 32 of the carrier 30 is the 1 st member M1, and the carrier base portion (1 st portion) 31 of the carrier 30, in particular, the column portion 31b of the carrier base portion 31 is the 2 nd member M2. In addition, as a 3 rd application example, the fastening structure FS can be configured such that the revolving unit 6Y of the robot 6 is the 1 st member M1, and the reduction gear 10, in particular, the carrier 30 of the reduction gear 10 (more specifically, the base plate portion 31a of the carrier base portion 31) is the 2 nd member M2.
Next, specific examples of the loosening prevention member will be described with reference to fig. 4 to 9. Fig. 4 to 9 show the periphery of the bolt of the fastening structure FS in an enlarged manner. In the following description, corresponding components, members, portions, and the like are denoted by the same reference numerals, and redundant description thereof is omitted.
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First, the 1 st aspect of the present embodiment will be described mainly with reference to fig. 4. In the 1 st aspect shown in fig. 4, the fastening structure FS includes: 1 st member M1, 2 nd member M2, bolt B, and anti-loosening element 70.
The 1 st member M1 has a through hole TH through which the bolt B passes. Further, the 1 st member M1 has a recess RP (receiving portion) for receiving the head HP of the bolt B. The recess RP is formed as a counterbore. The recess RP is defined by the wall portion WP and the bottom portion BP. The wall portion WP shown in fig. 4 can have, for example, a shape corresponding to the head HP of the bolt B, a shape complementary to the head HP of the bolt B. The wall portion WP can have a shape having a cylindrical outer peripheral surface, for example. The through-holes TH are continuous with the recessed portion RP. More specifically, one end of the through hole TH opens at the bottom BP of the recess RP. A gap is formed between the wall surface of the through hole TH and the bolt B inserted through the through hole.
The 2 nd member M2 has a threaded hole SH that engages the bolt B. The screw hole SH is formed as a bottomed hole in the illustrated example, but may be formed as a through hole.
The bolt B may be a square head bolt having a prismatic head HP, for example, a hexagonal bolt having a hexagonal head HP. In the illustrated example, the bolt B is an inner-angle bolt having a head HP provided with a hole BH. The inner angle bolt is rotated using a wrench inserted into the angular hole BH to engage with the threaded hole SH of the 2 nd member M2. As a typical example, the bolt B may be a hexagon socket bolt having a hexagonal prism-shaped hole BH in the head HP.
Next, the loosening prevention member 70 in the 1 st embodiment will be described. In the 1 st embodiment, the stopper 70 is disposed in the recess RP of the 1 st member M1. The anti-loosening element 70 has a contact portion 71 disposed in the recess RP. As shown in fig. 4, the contact portion 71 of the loosening prevention member 70 is in contact with the wall portion WP of the recess RP and the head portion HP of the bolt B in the state of being disposed in the recess RP. The relative rotation of the looseness prevention member 70 with respect to the 1 st member M1 is restricted by friction between the contact portion 71 of the looseness prevention member 70 and the wall portion WP of the recessed portion RP. In addition, the relative rotation of the loosening prevention member 70 and the bolt B is restricted by the friction between the contact portion 71 of the loosening prevention member 70 and the head HP of the bolt B. As a result, by restricting the relative rotation of the bolt B with respect to the 1 st member M1 by using the loosening prevention piece 70, the bolt B can be effectively prevented from loosening.
In the illustrated example, the contact portion 71 is formed in a ring shape so as to surround the head HP of the bolt B. Thus, the frictional force between the contact portion 71 of the looseness prevention member 70 and the head HP of the bolt B can be increased. The contact portion 71 of the loosening prevention member 70 can be in contact with the wall portion WP of the recess RP over the entire circumference thereof. Therefore, the frictional force between the contact portion 71 of the looseness prevention member 70 and the wall portion WP of the recess RP can be increased. Thus, the retainer 70 having the annular contact portion 71 can provide excellent retaining function for the bolt B.
As shown in the illustrated example, even when the head HP of the bolt B has a cylindrical outer shape, a sufficient contact area can be ensured by forming the surface of the contact portion 71 of the loosening prevention member 70, which contacts the bolt B, into a cylindrical inner circumferential surface. Further, the bolt B can be effectively prevented from loosening by a sufficient frictional force due to a sufficient contact area. Similarly, when the wall portion WP of the recess RP has a cylindrical inner peripheral surface shape, a surface of the contact portion 71 of the loosening prevention tool 70 that contacts the wall portion WP is formed in a cylindrical outer peripheral surface shape, whereby a sufficient contact area can be secured. Further, a sufficient frictional force can be exerted due to a sufficient contact area. That is, even when the bolt head HP not including the angular portion, which has been considered difficult to stop rotation, is used, the locking of the bolt B can be effectively achieved.
In order to make the loosening prevention function of the loosening prevention member 70 more effective, it is preferable that the static friction coefficient at the contact portion 71 of the loosening prevention member 70 is made larger than the static friction coefficient at the head HP of the bolt B and is also made larger than the static friction coefficient at the wall portion WP of the recess RP. Here, the static friction coefficient is a value measured according to JIS K7125.
In order to make the loosening prevention function of the loosening prevention member 70 more effective, the contact portion 71 is preferably press-fitted between the head HP of the bolt B and the wall portion WP of the recess RP. That is, the contact portion 71 is preferably press-fitted between the head HP of the bolt B and the wall WP of the recess RP, so that the loosening prevention member 70 is attached to the recess RP by interference fit. It is also preferable in that the installation of the retainer 70 by press-fitting is easy. The pressed contact portion 71 is compressed between the head HP of the bolt B and the wall portion WP of the recess RP. Therefore, the contact portion 71 can generate a large frictional force between the head portion HP of the bolt B and the wall portion WP of the recess RP. This makes it possible to further improve the loosening prevention of the bolt B by the loosening prevention member 70.
In the example shown in fig. 4, the check member 70 also has a top portion 72 connected to the contact portion 71. The top portion 72 is disposed at a position covering the bolt B located in the recess RP. In the illustrated example, the top portion 72 has a projection 73 located in the ridge hole BH of the bolt B. The projection 73 projects from the top 72 toward the bolt B. By providing the lock 70 with the convex portion 73, the lock 70 can be positioned with high accuracy with respect to the 1 st member M1 and the bolt B, and thus loosening of the bolt B can be prevented more effectively. Further, the contact between the convex portion 73 of the loosening prevention member 70 and the wall portion in the ridge hole BH can increase the frictional force between the head BH of the bolt B and the contact portion 71 of the loosening prevention member 70, and thus the loosening prevention of the bolt B can be made more effective.
In order to further enhance the locking function of the locking element 70, it is preferable that the convex portion 73 of the locking element 70 is press-fitted into the ridge hole BH of the bolt B. That is, it is preferable that the protruding portion 73 of the locking element 70 is press-fitted into the hole BH of the bolt B, so that the locking element 70 is attached to the hole BH by interference fit. The loosening prevention tool 70 can be easily and stably attached to the recessed portion RP of the 1 st member M1 by a single simple operation, and the friction force between the loosening prevention tool 70 and the bolt B can be increased to improve the loosening prevention function.
In the illustrated example, a screw hole 74 is provided in the top portion 72 of the stopper 70. As shown by the two-dot chain line in fig. 4, the screw member 100 can be attached to the anti-loosening element 70 by using the screw hole 74 of the anti-loosening element 70. By rotating the screw member 100 relative to the release prevention member 70, the screw member 100 can be moved relative to the release prevention member 70. As shown by the two-dot chain line in fig. 4, the screw member 100 is further rotated from the state in which the screw member 100 is in contact with the bolt B and the 1 st member M1, and the check ring 70 is moved relative to the bolt B and the 1 st member M1, whereby the check ring 70 can be easily detached from the 1 st member M1. The use of the threaded member 100 is convenient when the retainer 70 press-fitted into the recess RP of the 1 st member M1 is removed from the recess RP.
In the illustrated example, the rotation axis of the screw member 100, the rotation axis AX of the bolt B, and the relative movement direction of the screw member 100 with respect to the loosening prevention member 70 are parallel to each other. In the illustrated example, the screw member 100 is engaged with the screw hole 74 of the retainer 70, and can be brought into contact with the bottom of the ridge hole BH provided in the head HP of the bolt B. The screw member 100 can be stably contacted with the bolt B in the axial direction of the bolt B. This enables the release preventing member 70 to be more stably and easily detached from the 1 st member M1.
In addition, a screw hole 74 is provided in the projection 73 at the top 72 of the retainer 70. In other words, the convex portion 73 is formed in a cylindrical shape, and has a screw thread formed on an inner peripheral surface thereof. With such a configuration, the engagement length of the screw member 100 with the screw hole 74 of the loosening prevention tool 70 can be sufficiently secured, the operation of the screw member 100 can be stably performed, and the relative movement of the screw member 100 with respect to the loosening prevention tool 70 can be stabilized.
In the illustrated example, the entire anti-loosening element 70 is disposed inside the recessed portion RP of the 1 st member M1. According to this example, in addition to the bolt B, the looseness prevention member 70 can be effectively prevented from being exposed to the outside and coming into contact with the outside, and the like. Thereby, loosening of the bolt B can be prevented more effectively using the loosening prevention member 70.
In the 1 st embodiment described above, the retainer 70 has the annular contact portion 71, and the annular contact portion 71 is disposed in the recess RP for receiving the head HP of the bolt B so as to contact the head HP of the bolt B and the wall portion WP of the recess RP. The rotation of the looseness prevention piece 70 with respect to the 1 st member M1 can be effectively restricted by friction between the wall portion WP of the recess RP and the contact portion 71 of the looseness prevention piece 70. In addition, the rotation of the bolt B with respect to the loosening prevention member 70 can be effectively restricted by the friction between the head HP of the bolt B and the contact portion 71 of the loosening prevention member 70. In particular, since the contact portion 71 of the loosening prevention member 70 is annular and can contact the bolt head HP in an annular region, the rotation of the bolt B with respect to the loosening prevention member 70 can be more effectively restricted. By using such a loosening prevention member 70, loosening of the bolt B can be effectively prevented.
The retainer 70 of the 1 st embodiment constitutes a retainer mechanism LM together with the 1 st member M1, and can effectively prevent loosening of the bolt B inserted through the through hole TH and engaged with the threaded hole SH of the 2 nd member M2, and the 1 st member M1 includes: a recess RP for receiving the head HP of the bolt B; and a through hole TH connected to the recess RP and through which the bolt B passes.
The retainer 70 of the 1 st embodiment constitutes a fastening structure FS together with: a bolt B; a 1 st member M1, having: a recess RP for receiving the head HP of the bolt B and a through hole TH connected to the recess RP and through which the bolt B passes; and a 2 nd member M2 having a screw hole SH to be engaged with the bolt B passed through the through hole TH. In this fastening structure FS, loosening of the bolt B is effectively suppressed, and therefore, a state in which the 1 st member M1 and the 2 nd member M2 are stably fastened can be maintained.
< form 2 >
Next, the 2 nd embodiment will be described mainly with reference to fig. 5. The fastening structure FS of the 2 nd embodiment shown in fig. 5 includes the 1 st member M1, the 2 nd member M2, the bolt B, and the loosening prevention member 70, as in the 1 st embodiment. In the fastening structure FS of the 2 nd embodiment, since the 1 st member M1, the 2 nd member M2, and the bolt B can be configured in the same manner as in the 1 st embodiment, redundant detailed description is omitted and different configurations are described in more detail.
In the 2 nd aspect, the retainer 70 has a thread (male thread, 2 nd thread) OS that engages with a thread (female thread, 1 st thread) IS provided in a recess RP for receiving the head HP of the bolt B. In the 2 nd aspect, the stopper 70 is fixed to the recess RP for receiving the head HP of the bolt B and contacts the head HP to restrict rotation of the bolt B. As a result, the relative rotation of the bolt B with respect to the 1 st member M1 is restricted by using the loosening prevention element 70, and the loosening of the bolt B can be effectively prevented.
In the illustrated example, a screw (female screw) IS provided in the recess RP of the 1 st member M1. On the other hand, the check member 70 has a thread (male thread) OS that meshes with the thread IS of the recess RP. The looseness prevention member 70 IS fixed to the recessed portion RP of the 1 st member M1 by engaging with the thread IS of the recessed portion RP. As shown in fig. 5, the check member 70 IS brought into contact with the bolt B by tightening the thread OS of the check member 70 to the thread IS of the recess RP. By further rotating the loosening prevention member 70, the bolt B is pressed in the axial direction of the bolt B, in other words, the rotation axis AX of the bolt B. That is, the retainer 70 functions as a locking screw member to prevent the bolt B from being loosened. The rotation axis of the looseness prevention member 70 is located on the rotation axis AX of the bolt B.
As shown in fig. 5, the anti-release member 70 has a cylindrical shape with a low height. The anti-loosening element 70 is formed with a thread OS on the outer circumferential surface thereof. On the other hand, the retainer 70 has a ridge hole 77 at a center of its outer peripheral surface, i.e., at the central axis AX. The prism hole 77 forms a prismatic space, for example, a hexagonal prism-like space. By rotating an internal angle wrench (for example, an internal hexagonal wrench) inserted into the ridge hole 77, the loosening prevention tool 70 functioning as a stopper screw member can be moved in the recessed portion RP and fastened to a position in contact with the head HP of the bolt B.
A gap IS formed between the head HP of the bolt B and the wall WP of the recess RP so that the head HP of the bolt B does not contact the thread IS in the recess RP. Thus, the diameter DH of the head HP of the bolt B is smaller than the nominal diameter DL of the check 70.
In addition, in order not to excessively increase the depth of the recessed portion RP of the 1 st member M1, it is preferable to design the height HH of the head HP of the bolt B to be small within a strength allowable range. On the other hand, the height HL of the looseness prevention member 70 IS designed to ensure the engagement length of the thread OS of the looseness prevention member 70 and the thread IS of the recess RP to some extent. For example, the height HL of the loosening prevention member 70 can be determined so that the thread OS having three thread lengths of the loosening prevention member 70 can be engaged with the thread IS of the recess RP. In the illustrated example, the height HL of the looseness prevention member 70 is higher than the height HH of the head HP of the bolt B.
In addition, from the viewpoint of reducing the size and weight by reducing the height HL of the loosening prevention member 70 while securing the engagement length of the loosening prevention member 70 to a certain extent, the thread OS of the loosening prevention member 70 is preferably a fine thread. For example, the pitch of the looseness prevention member 70 may be shorter than the pitch of the bolt B. According to this example, the locking member 70 and the recess RP can be miniaturized while ensuring sufficient engagement of the thread OS of the locking member 70 and the thread IS of the recess RP.
Further, it is preferable that the loosening prevention member 70 has a reverse threaded relationship with the bolt B. In other words, it is preferable that one of the check member 70 and the bolt B uses a reverse thread (left-hand thread) and the other of the check member 70 and the bolt B uses an orthodontic thread (right-hand thread). According to this example, the rotation direction of the bolt B for loosening the bolt B and the rotation direction of the loosening prevention member 70 for loosening the loosening prevention member 70 become opposite. Therefore, when the bolt B is loosened by the rotation of the bolt B for some reason, a tightening force is applied to the check member 70 in contact with the bolt B because the bolt B is rotated. Thereby, loosening of the bolt B can be prevented more effectively using the loosening prevention member 70.
In the illustrated example, the entire anti-loosening element 70 is disposed inside the recessed portion RP of the 1 st member M1. According to this example, in addition to the bolt B, the looseness prevention member 70 can be effectively prevented from being exposed to the outside and coming into contact with the outside, and the like. Thereby, loosening of the bolt B can be prevented more effectively using the loosening prevention member 70.
In the above-described embodiment 2, the retainer 70 has the thread OS that engages with the thread IS provided in the recess RP for receiving the head HP of the bolt B. The loosening prevention member 70 is fixed to the recess RP for receiving the head HP of the bolt B and contacts the head HP, thereby restricting the rotation of the bolt B. By using such a loosening prevention member 70, loosening of the bolt B can be effectively prevented.
The retainer 70 of the 2 nd embodiment constitutes a retainer LM together with the 1 st member M1, and can effectively prevent loosening of the bolt B inserted through the through hole TH and engaged with the threaded hole SH of the 2 nd member M2, and the 1 st member M1 includes: a recess RP for receiving the head HP of the bolt B; and a through hole TH connected to the recess RP and through which the bolt B is inserted.
The retainer 70 of the 2 nd embodiment constitutes a fastening structure FS together with: a bolt B; a 1 st member M1 having a recess RP for receiving the head HP of the bolt B and a through hole TH connected to the recess RP and through which the bolt B passes; and a 2 nd member M2 having a screw hole SH to be engaged with the bolt B passed through the through hole TH. In this fastening structure FS, loosening of the bolt B is effectively suppressed, and therefore, a state in which the 1 st member M1 and the 2 nd member M2 are stably fastened can be maintained.
In the above description, the example in which the loosening prevention member 70 IS fixed to the recessed portion RP by the engagement of the thread OS of the loosening prevention member 70 and the thread IS of the recessed portion RP IS described. However, the embodiment 2 is not limited to this example, and the rotation of the bolt B may be restricted by fixing the loosening prevention member 70 to the recess RP by another method and contacting the head HP. For example, the anti-loosening element 70 may be press-fitted into the recess RP and fixed to the recess RP by interference fit. According to this example, the retainer 70 can be fixed to the recessed portion RP of the 1 st member M1 by a simple operation.
< form 3 >
Next, the 3 rd embodiment will be described mainly with reference to fig. 6 to 9. The fastening structure FS of the 3 rd embodiment shown in fig. 6 to 9 has the 1 st member M1, the 2 nd member M2, the bolt B, and the loosening prevention tool 70, as in the 1 st and 2 nd embodiments. In the fastening structure FS of the 3 rd embodiment, since the 1 st member M1, the 2 nd member M2, and the bolts B can be configured in the same manner as in the 1 st embodiment, redundant detailed description is omitted and different configurations are described in more detail.
In the 3 rd embodiment, the locking tool 70 is attached to the 1 st bolt B1 so as to restrict relative rotation with the 1 st bolt B1, and is attached to the 2 nd bolt B2 so as to restrict relative rotation with the 2 nd bolt B2. The rotational axis (central axis of the 1 st bolt B1) AX1 of the 1 st bolt B1 and the rotational axis (central axis of the 2 nd bolt B1) AX2 of the 2 nd bolt B2 are arranged offset without being located on a straight line. Thus, in the 3 rd aspect, by restricting the relative rotation of the 1 st bolt B1 and the check member 70 and restricting the relative rotation of the 2 nd bolt B2 and the check member 70, both loosening of the 1 st bolt B1 and loosening of the 2 nd bolt B2 can be effectively prevented.
In example 3, fixing device FD is composed of 1 st bolt B1, 2 nd bolt B2, and check tool 70 is attached to 1 st bolt B1 and 2 nd bolt B2 so as to restrict relative rotation with 1 st bolt B1 and 2 nd bolt B2, respectively. The fixing device FD is used to fix the 1 st member M1 and the 2 nd member M2 by fastening.
Fig. 6 and 7, and fig. 8 and 9 show specific examples of the stopper 70 different from each other. In either example, the 2 nd member M2 is independently provided with the 1 st screw hole SH1 engaged with the 1 st bolt B1 and the 2 nd screw hole SH2 engaged with the 2 nd bolt B2. In addition, the 1 st member M1 is provided with a through hole TH through which the 1 st bolt B1 is inserted and a through hole TH through which the 2 nd bolt B2 is inserted, independently. However, the present invention is not limited to this example, and the 1 st member M1 may be provided with a single through hole TH through which both the 1 st bolt B1 and the 2 nd bolt B2 are inserted.
In addition, for either of the two examples shown, only one recessed portion RP as a counterbore is formed in the 1 st member M1. In the single recess RP, both the head HP of the 1 st bolt B1 and the head HP of the 2 nd bolt B2 are disposed. However, the present invention is not limited to this example, and the head HP of the 1 st bolt B1 and the head HP of the 2 nd bolt B2 may be respectively housed in the separately provided recess RP. As another example, at least either one of the head HP of the 1 st bolt B1 and the head HP of the 2 nd bolt B2 may be exposed or protruded without providing the recess RP.
In both of the two examples shown in the drawings, the entire retainer 70 is disposed inside the recess RP provided to the 1 st member M1. According to this example, in addition to the 1 st bolt B1 and the 2 nd bolt B2, the looseness prevention member 70 can be effectively prevented from being exposed to the outside to be in contact with the outside, or the like. Thereby, both loosening of the 1 st bolt B1 and loosening of the 2 nd bolt B2 can be more effectively prevented using the loosening prevention piece 70.
First, the loosening prevention member 70 shown in fig. 6 and 7 will be explained. In the specific example shown in fig. 6 and 7, the notch CP is provided in the head HP of the 1 st bolt B1 and the head HP of the 2 nd bolt B2. The loosening prevention member 70 is disposed in the notch CP of the 1 st bolt B1. The loosening prevention member 70 is also disposed in the notch CP of the 2 nd bolt B2. In this example, the stopper 70 connected to the 2 nd bolt B2 functions as a key with respect to the 1 st bolt B1 to stop the rotation of the 1 st bolt B1. The retainer 70 connected to the 1 st bolt B1 functions as a key for the 2 nd bolt B2 to stop rotation of the 2 nd bolt B2. As a result, the rotation of both the 1 st bolt B1 and the 2 nd bolt B2 is restricted.
According to the example shown in fig. 6 and 7, the structure of the locking member 70 and the fixing device FD can be simplified and miniaturized. In addition, the attachment of the looseness prevention member 70 to the 1 st bolt B1 and the 2 nd bolt B2 can be easily performed. In particular, the looseness prevention member 70 can be attached to both of the 1 st bolt B1 and the 2 nd bolt B2 by a simple action.
In the example shown in fig. 6 and 7, the locking member 70 may be press-fitted into the notch CP. The looseness prevention member 70 can be stably installed to both of the 1 st bolt B1 and the 2 nd bolt B2 by a simple action. The anti-release member 70 is stably fixed to the notch portion CP by interference fit.
In the example of fig. 6 and 7, the loosening prevention member 70 functioning as a key extends in a direction inclined, particularly perpendicular, to the rotation axis (center axis of the 1 st bolt B1) AX1 of the 1 st bolt B1. Thus, the loosening prevention member 70 can effectively restrict the rotation of the 1 st bolt B1. Similarly, the looseness prevention piece 70 functioning as a key extends in a direction inclined, particularly perpendicular, to the rotation axis (central axis of the 2 nd bolt B2) AX2 of the 2 nd bolt B2. Thus, the looseness prevention member 70 can effectively restrict the rotation of the 2 nd bolt B2.
The cutout CP may be formed in advance in the bolts B1 and B2. However, after the 1 st member M1 and the 2 nd member M2 are fastened by tightening the bolts B1 and B2, the notched portions CP may be formed on the bolts B1 and B2 by spot facing. According to this example, after the bolts B1 and B2 are reliably screwed, the stopper 70 can be attached to the notch CP disposed at an appropriate position. Thereby, the 1 st member M1 and the 2 nd member M2 can be stably fastened.
In the example shown in fig. 6 and 7, bolts B1 and B2 are inner angle bolts (hexagon socket bolts) each having a hole BH (hexagonal hole) formed in a head HP. Therefore, by inserting an inner angle wrench (for example, an inner hexagonal wrench corresponding to a hexagonal hole) into the angular hole BH and rotating the inner angle wrench, the bolts B1 and B2 can be rotated. Further, the head HP of the bolts B1 and B2 is not connected to the ridge hole BH at the notch CP. That is, the notch CP is separated from the prism hole BH. Such a structure is excellent in strength.
Next, the stopper 70 shown in fig. 8 and 9 will be described. In the specific example shown in fig. 8 and 9, the head HP of the 1 st bolt B1 and the head HP of the 2 nd bolt B2 are formed with the prism hole BH, respectively. By inserting an inner angle wrench into the ridge hole BH and rotating the inner angle wrench, bolts B1 and B2 can be rotated. The stopper 70 shown in fig. 8 and 9 includes: a 1 st projection 81 disposed in a ridge hole BH provided in the head HP of the 1 st bolt B1; a 2 nd projection 82 disposed in a ridge hole BH provided in the head HP of the 2 nd bolt B2; and a base portion 80 that holds the 1 st projection 81 and the 2 nd projection 82. The 1 st projection 81 and the 2 nd projection 82 are fixed to the base 80 and project from the base 80. The 1 st and 2 nd protrusions 81 and 82 may also be formed integrally with the base portion 80 and protrude from the base portion 80.
The 1 st projection 81 includes a prismatic (hexagonal prism) portion corresponding to the prism hole BH (for example, hexagonal hole) of the 1 st bolt B1. Therefore, when the 1 st projection 81 is disposed in the prism hole BH of the 1 st bolt B1, the rotation of the 1 st bolt B1 about the rotation axis (center axis) AX1 of the 1 st bolt B1 is restricted. Likewise, the 2 nd protrusion 82 includes a prism-shaped (hexagonal prism-shaped) portion corresponding to the prism hole BH (for example, hexagonal hole) of the 2 nd bolt B2. When the 2 nd projection 82 is disposed in the ridge hole BH of the 2 nd bolt B2, rotation about the rotation axis (center axis) AX2 of the 2 nd bolt B2 with respect to the 2 nd bolt B2 is restricted.
According to the example shown in fig. 8 and 9, the structure of the locking member 70 and the fixing device FD can be simplified and miniaturized. In addition, the attachment of the looseness prevention member 70 to the 1 st bolt B1 and the 2 nd bolt B2 can be easily performed. In particular, the looseness prevention member 70 can be attached to both of the 1 st bolt B1 and the 2 nd bolt B2 by a simple action.
In the example shown in fig. 8 and 9, the 1 st projection 81 and the 2 nd projection 82 of the retainer 70 may be press-fitted into the ridge holes BH of the 1 st bolt B1 and the 2 nd bolt B2, respectively. The looseness prevention member 70 can be stably installed to both of the 1 st bolt B1 and the 2 nd bolt B2 by a simple action. Further, the looseness prevention member 70 is stably fixed to the ridge hole BH by interference fit.
In the example of fig. 8 and 9, the base 80 of the looseness prevention member 70 extends in a direction inclined, in particular, perpendicular, with respect to the rotation axis (the center axis of the 1 st bolt B1) AX1 of the 1 st bolt B1. Thus, the loosening prevention member 70 can effectively restrict the rotation of the 1 st bolt B1. Likewise, the base portion 80 of the looseness prevention member 70 extends in a direction inclined, in particular, perpendicular, with respect to the rotation axis (the center axis of the 2 nd bolt B2) AX2 of the 2 nd bolt B2. Thus, the looseness prevention member 70 can effectively restrict the rotation of the 2 nd bolt B2.
In the example shown in fig. 8, a gap is formed between the wall portion WP of the recess RP and the outer edge of the base portion 80, but the gap between the wall portion WP of the recess RP and the outer edge of the base portion 80 may be filled by press-fitting the base portion 80 into the recess RP and interference-fitting the base portion 80 into the recess RP.
In the 3 rd embodiment described above, the retainers 70 are attached to the 1 st bolt B1 and the 2 nd bolt B2 so as to restrict relative rotation with the 1 st bolt B1 and the 2 nd bolt B2, respectively. That is, by restricting the relative rotation of the 1 st bolt B1 and the check member 70 and restricting the relative rotation of the 2 nd bolt B2 and the check member 70, both loosening of the 1 st bolt B1 and loosening of the 2 nd bolt B2 can be effectively prevented.
The retainer 70 of the 3 rd embodiment constitutes a fixing device FD together with the 1 st bolt B1 and the 2 nd bolt B2. According to this fixing device FD, since both loosening of the 1 st bolt B1 and loosening of the 2 nd bolt B2 are effectively prevented, it is possible to maintain the state in which the 1 st member M1 and the 2 nd member M2 are stably fastened tightly.
The loosening prevention member 70 according to embodiment 3 constitutes a fastening structure FS together with: 1 st bolt B1 and 2 nd bolt B2; a 1 st member M1 having a through hole TH through which the 1 st bolt B1 and the 2 nd bolt B2 pass; and a 2 nd member M2 having SH1 engaged with the 1 st bolt B1 and a 2 nd threaded hole SH2 engaged with the 2 nd bolt. In this fastening structure FS, since both loosening of the 1 st bolt B1 and loosening of the 2 nd bolt B2 are effectively prevented, it is possible to maintain a state in which the 1 st member M1 and the 2 nd member M2 are stably fastened.
As described above, according to the present embodiment, the loosening of the bolt B for fastening the 1 st member M1 and the 2 nd member M2 can be effectively prevented by using the loosening prevention member 70. This can maintain the 1 st member M1 and the 2 nd member M2 stably fixed tightly.
In the above-described embodiment, one of the 1 st member M1 and the 2 nd member M2 is provided as the speed reducer 10, and particularly, the housing 20 or the carrier 30 of the speed reducer 10. Therefore, the speed reducer 10 and the 1 st member M1 or the 2 nd member M2 can be maintained in a stably fastened state using the bolt B. This can increase the output of the reduction gear 10.
As a specific example of the above-described embodiment, one of the 1 st member M1 and the 2 nd member M2 is defined as the 1 st portion (carrier base portion) 31 of the carrier 30 of the transmission 10, and the other of the 1 st member M1 and the 2 nd member M2 is defined as the 2 nd portion (plate portion) 32 of the carrier 30 of the transmission 10. The 1 st and 2 nd portions 31 and 32 of the carrier 30 can be maintained in a stably fastened state using bolts. Therefore, the output of the small reduction gear 10 can be increased to output a high torque.
While one embodiment has been described with reference to a plurality of specific examples, the specific examples are not intended to limit the embodiment. The above-described embodiment can be implemented in various other specific examples, and various omissions, substitutions, changes, and additions can be made without departing from the spirit thereof.
For example, in the above-described specific example, the 2 nd member M2 having the screw hole is shown as a component of the speed reducer 10 or the robot 6, but the present invention is not limited to this example, and the 2 nd member M2 may be a nut. The screw hole to which the bolt is engaged may be a bottomed hole as in the illustrated example, or may be a through hole.
In addition, although an example in which the fastening structure FS is applied to an eccentric oscillating type reduction gear is shown, the present invention is not limited thereto. The fastening structure FS may be applied to a swirler type speed reducer or a planetary gear type speed reducer. The application target of the fastening structure FS is not limited to the reduction gear, and can be applied to various gear transmission devices and the like.
