阅读说明：本技术 反向输入切断离合器 (Reverse input disconnect clutch ) 是由 土肥永生 大黑优也 于 2020-11-27 设计创作，主要内容包括：本发明实现能够抑制输出部件的晃动的反向输入切断离合器。具备：被按压部件,其在内周面具有被按压面(20)；输入部件,其具有配置于被按压面(20)的径向内侧的输入侧卡合部(8),且与被按压面(20)同轴配置；输出部件,其具有在被按压面(20)的径向内侧相比输入侧卡合部(8)配置在径向内侧的输出侧卡合部(11),且与被按压面(20)同轴配置；卡合件(5),其以能够在相对于被按压面(20)远离或接近的方向即第一方向移动的方式配置于被按压面(20)的径向内侧；以及弹性部件(56),其配置于在第一方向上与输出侧卡合部(11)重叠的位置,且弹性地撑在输出侧卡合部(11)与卡合件(5)之间。(The invention provides a reverse input disconnect clutch capable of suppressing shaking of an output member. The disclosed device is provided with: a pressed member having a pressed surface (20) on an inner peripheral surface thereof; an input member having an input-side engagement portion (8) disposed radially inward of a pressed surface (20), and disposed coaxially with the pressed surface (20); an output member having an output-side engagement portion (11) disposed radially inward of the input-side engagement portion (8) relative to the radially inward side of the pressed surface (20), and disposed coaxially with the pressed surface (20); an engaging piece (5) which is disposed radially inward of the pressed surface (20) so as to be movable in a first direction, which is a direction in which the engaging piece is separated from or approaches the pressed surface (20); and an elastic member (56) which is disposed at a position overlapping the output-side engaging portion (11) in the first direction and elastically supported between the output-side engaging portion (11) and the engaging piece (5).)

1. A reverse input disconnect clutch is characterized by comprising:

a pressed member having a pressed surface on an inner peripheral surface thereof;

an input member having an input-side engagement portion disposed radially inward of the pressed surface and disposed coaxially with the pressed surface;

an output member having an output-side engagement portion disposed radially inward of the input-side engagement portion with respect to the radially inward side of the pressed surface, and disposed coaxially with the pressed surface;

an engaging piece having at least one pressing surface facing the pressed surface, an input-side engaged portion engageable with the input-side engaging portion, and an output-side engaged portion engageable with the output-side engaging portion, the engaging piece being disposed radially inward of the pressed surface so as to be movable in a first direction, which is a direction away from or closer to the pressed surface; and

an elastic member disposed at a position overlapping the output side engaging portion in the first direction and elastically supported between the output side engaging portion and the engaging piece,

the engaging piece is configured to be displaced so as to be away from the pressed surface based on engagement between the input-side engaging portion and the input-side engaged portion when a torque is input to the input member, to elastically deform the elastic member so as to engage the output-side engaged portion with the output-side engaging portion, to transmit the torque input to the input member to the output member, and to be displaced so as to approach the pressed surface when a torque is input to the output member in a reverse direction, to elastically deform the elastic member so as to engage the output-side engaging portion with the output-side engaged portion, to press the pressed surface against the pressed surface, and to frictionally engage the pressed surface with the pressed surface.

2. The reverse input disconnect clutch of claim 1,

the elastic member is not fixed to any one of the output member and the engaging piece, but is elastically sandwiched between the output-side engaging portion and the engaging piece.

3. The reverse input disconnect clutch of claim 2,

the elastic member is configured to be restricted from moving in the axial direction of the pressed surface by engagement with the engaging piece.

4. The reverse input disconnect clutch of claim 2 or 3,

the elastic member is restricted from displacement in a second direction orthogonal to both the first direction and the axial direction of the pressed surface by engagement with the engaging piece.

5. The reverse input disconnect clutch according to any one of claims 1 to 4,

when torque is input to the input member and when torque is input in a reverse direction to the output member, the output side engaging portion and the output side engaged portion are not directly engaged with each other by the elastic member.

6. The reverse input disconnect clutch according to any one of claims 1 to 5,

the elastic member is exposed from the engaging piece only at a portion between the output side engaging portion and the output side engaged portion when viewed in the axial direction of the pressed surface.

7. The reverse input disconnect clutch according to any one of claims 1 to 6,

the elastic member has the following functions: in a neutral state in which no torque is input to the input member and the output member, the pressing surface is pressed against the pressed surface by an elastic force applied to the engaging piece.

8. The reverse input disconnect clutch according to any one of claims 1 to 7,

the elastic member is formed of a plate spring.

9. The reverse input disconnect clutch of claim 8,

the output side engaged portion is formed of a concave portion provided on a side surface of the engaging piece on a side farther from the pressed surface in the first direction,

the elastic member is disposed so as to straddle the output-side engaged portion when viewed in the axial direction of the pressed surface.

10. The reverse input disconnect clutch according to any one of claims 1 to 9,

the engaging piece is formed of a single member.

11. The reverse input disconnect clutch according to any one of claims 1 to 9,

the engaging piece is composed of a plurality of members including an engaging piece main body and a link member,

the engaging piece main body has the pressing surface, the output side engaged portion, and a swing support portion located closer to the pressed surface than the input side engaging portion in the first direction,

the link member has a first end portion connected to the swing support portion in a swingable manner, and a second end portion including the input-side engaged portion and connected to the input-side engaging portion in a swingable manner,

when a torque is input to the input member, the input-side engagement portion pulls the swing support portion via the link member, and the engagement piece is displaced so as to be away from the pressed surface.

12. The reverse input disconnect clutch of claim 11,

the engaging piece body includes a pair of body plates disposed to overlap each other in the axial direction of the pressed surface and coupled to each other, and a swing support shaft supported by the pair of body plates at both axial side portions thereof,

each of the pair of main body plates has the pressing surface and the output-side engaged portion,

the swing support portion is constituted by the swing support shaft,

the link member is disposed between the pair of main body plates.

13. The reverse input disconnect clutch of claim 12,

the engaging piece body has a pair of intermediate plates sandwiched between the pair of main body plates,

the pair of intermediate plates are disposed on both sides in a second direction orthogonal to both the first direction and an axial direction of the pressed surface in a portion between the pair of main body plates,

the swing support shaft is supported by the intermediate portions of the pair of main body plates in the second direction,

the link member is disposed swingably at an intermediate portion in the second direction in a portion between the pair of main body plates.

14. The reverse input disconnect clutch according to any one of claims 1 to 13,

the input-side engaging portion, the engaging piece, and the elastic member are each composed of a pair of input-side engaging portions, a pair of engaging pieces, and a pair of elastic members arranged so as to sandwich the output-side engaging portion from both sides in the radial direction.

15. The reverse input disconnect clutch of claim 14,

the pressing device includes a biasing member that is disposed at a position offset from the output-side engaging portion in a second direction orthogonal to both the first direction and the axial direction of the pressed surface, and that is elastically supported between the pair of engaging pieces.

Technical Field

The present invention relates to a reverse input disconnect clutch having the following functions: the torque input to the input member is transmitted to the output member, while the torque reversely input to the output member is completely cut off and not transmitted to the input member, or only a part thereof is transmitted to the input member and the remaining part is cut off.

Background

Fig. 24 to 29 show an example of a conventional structure of a reverse input disconnect clutch described in international publication No. 2019/026794.

The reverse input disconnection clutch 101 includes an input member 102, an output member 103, a pressed member 104, and a pair of engaging pieces 105.

The input member 102 is connected to an input-side mechanism such as an electric motor, and receives input of torque. The input member 102 includes an input shaft portion 106 and a pair of input-side engagement portions 107. The base end of the input shaft 106 is connected to the output portion of the input-side mechanism. The pair of input-side engagement portions 107 are formed by protruding portions extending in the axial direction from two positions on the diametrically opposite side of the distal end surface of the input shaft portion 106.

The output member 103 is connected to an output-side mechanism such as a speed reduction mechanism and outputs torque. The output member 103 is disposed coaxially with the input member 102, and has an output shaft 108 and an output side engagement portion 109. The base end of the output shaft 108 is connected to the input portion of the output-side mechanism. The output-side engagement portion 109 is substantially in the shape of an elongated circular column and extends in the axial direction from the center of the distal end surface of the output shaft portion 108. The output side engagement portion 109 is disposed in a portion between the pair of input side engagement portions 107.

The pressed member 104 is annular, fixed to another member not shown such as a housing, and is restricted from rotating. The pressed member 104 is disposed coaxially with the input member 102 and the output member 103, and is disposed radially outward of the pair of input-side engagement portions 107 and output-side engagement portions 109. The pressed member 104 has a pressed surface 110 formed of a cylindrical concave surface on its inner circumferential surface.

Each of the engaging pieces 105 of the pair of engaging pieces 105 has a substantially semicircular plate shape and is disposed radially inward of the pressed member 104. The engaging piece 105 has a pressing surface 111 formed of a partially cylindrical convex surface on a radially outer surface facing the pressed surface 110, and has a bottom surface 112 formed of a flat surface on a radially inner surface in addition to a portion provided in an output-side engaged portion 114 described below. The radius of curvature of the pressing surface 111 is equal to or smaller than the radius of curvature of the pressed surface 110. The radial direction of the engaging piece 105 is a direction perpendicular to the bottom surface 112 as indicated by an arrow a in fig. 24, and the width direction of the engaging piece 105 is a direction parallel to the bottom surface 112 as indicated by an arrow B in fig. 24.

In a state where the pair of engaging pieces 105 are arranged radially inward of the pressed member 104, the inner diameter of the pressed member 104 and the radial dimension of the engaging pieces 105 are regulated so that a gap is present in at least one of a portion between the pressed surface 110 and the pressing surface 111 and a portion between the bottom surfaces 112.

The engaging piece 105 has an input-side engaged portion 113 and an output-side engaged portion 114. The input-side engaged portion 113 is formed of a hole that penetrates a radially intermediate portion of the engaging piece 105 in the axial direction, and has a size that allows the input-side engaging portion 107 to be loosely inserted. Therefore, the input-side engaging portion 107 can be displaced in the rotational direction of the input member 102 relative to the engaging piece 105, and the engaging piece 105 can be displaced in the radial direction of the engaging piece 105 relative to the input-side engaging portion 107. The output-side engaged portion 114 is formed of a substantially rectangular concave portion that is recessed radially outward from the widthwise central portion of the bottom surface 112 of the engaging piece 105, and has a size of a front half portion in the minor axis direction in which the output-side engaging portion 109 can be disposed.

In the assembled state of the reverse input disconnection clutch 101, the pair of input side engagement portions 107 of the input member 102 are axially inserted into the input side engaged portions 113 of the pair of engagement pieces 105, and the output side engagement portion 109 of the output member 103 is axially inserted between the pair of output side engaged portions 114. That is, the pair of engaging pieces 105 are arranged to sandwich the output side engaging portion 109 from the radial outside.

When torque is input to the input member 102 from the input-side mechanism, as shown in fig. 28, the input-side engaging portion 107 rotates in the rotational direction of the input member 102 inside the input-side engaged portion 113. Then, the radially inner surface of the input-side engaging portion 107 presses the inner surface of the input-side engaged portion 113 radially inward, and each of the pair of engaging pieces 105 moves in a direction away from the pressed surface 110. Thereby, the pair of output-side engaged portions 114 sandwich the output-side engaging portion 109 of the output member 103 from both sides in the radial direction, and the output-side engaging portion 109 and the pair of output-side engaged portions 114 are engaged without rattling. As a result, the torque input to the input member 102 is transmitted to the output member 103 via the pair of engaging pieces 105, and is output from the output member 103.

On the other hand, when torque is reversely input from the output-side mechanism to the output member 103, the output-side engaging portion 109 rotates in the rotational direction of the output member 103 inside the pair of output-side engaged portions 114 as shown in fig. 29. Then, the corner portion of the output-side engaging portion 109 presses the bottom surface of the output-side engaged portion 114 radially outward, and each of the pair of engaging pieces 105 moves in a direction approaching the pressed surface 110. Thereby, the pressing surfaces 111 of the pair of engaging pieces 105 are pressed against the pressed surface 110 of the pressed member 104. As a result, the torque reversely input to the output member 103 is transmitted to the pressed member 104 fixed to another member not shown, and is completely cut off and not transmitted to the input member 102, or only a part of the torque reversely input to the output member 103 is transmitted to the input member 102 and the rest is cut off.

In order to completely block torque reversely input to the output member 103 without being transmitted to the input member 102, the pair of engaging pieces 105 are held between the output side engaging portion 109 and the pressed member 104 so that the pressing surface 111 does not slide with respect to the pressed surface 110, and the output member 103 is locked. In order to transmit only a part of the torque reversely input to the output member 103 to the input member 102 and cut the remaining part, the output member 103 is half-locked by holding the pair of engaging pieces 105 between the output side engaging portion 109 and the pressed member 104 so that the pressing surface 111 slides with respect to the pressed surface 110.

Documents of the prior art

Patent document

Patent document 1: international publication No. 2019/026794

Disclosure of Invention

Problems to be solved by the invention

When the reverse input disconnection clutch 101 is assembled, the output side engagement portion 109 of the output member 103 is inserted between the output side engaged portions 114 of the pair of engagement pieces 105. From the viewpoint of ensuring workability of the assembly work, it is preferable to limit the size of each part so that the output side engaging portion 109 can be inserted between the output side engaged portions 114 with some play. In this case, in a neutral state in which no torque is input to the input member 102 and the output member 103, a gap is formed between the output side engaging portion 109 and the output side engaged portion 114. Therefore, it is inevitable that the output member 103 rattles due to a gap between the output side engagement portion 109 and the output side engaged portion 114.

The backlash generated in the output member 103 may not be a problem depending on the application of the reverse input disconnecting clutch 101. However, in a case where the output member 103 is coupled to the screw shaft of the ball screw device, the input member 102 is coupled to the electric motor, and the reverse input/disconnection clutch 101 is applied to applications such as position adjustment of a stage fixed to a nut, steering angle adjustment of a tire, and the like, when torque is reversely input from the stage and the tire to the output member 103 via the nut, there is a possibility that the position of the stage and the steering angle of the tire are deviated from the adjusted positions due to the play of the output member 103, and abnormal noise or the like is generated.

The present invention aims to provide a reverse input/disconnection clutch capable of suppressing such rattling of an output member.

Means for solving the problems

The reverse input disconnect clutch according to one aspect of the present invention includes a pressed member, an input member, an output member, an engaging piece, and an elastic member.

The pressed member has a pressed surface on an inner peripheral surface.

The input member is disposed coaxially with the pressed surface and has an input-side engagement portion disposed radially inward of the pressed surface.

The output member is disposed coaxially with the pressed surface, and has an output-side engagement portion disposed radially inward of the input-side engagement portion on a radially inward side of the pressed surface.

The engaging piece is disposed radially inward of the pressed surface so as to be movable in a first direction, which is a direction in which the engaging piece is separated from or moves relative to the pressed surface, and includes at least one pressing surface facing the pressed surface, an input-side engaged portion engageable with the input-side engaging portion, and an output-side engaged portion engageable with the output-side engaging portion.

The elastic member is disposed at a position overlapping the output-side engaging portion in the first direction, and elastically supported (elastically deformed) between the output-side engaging portion and the engaging piece.

The engaging piece is configured to be displaced so as to be away from the pressed surface based on engagement between the input-side engaging portion and the input-side engaged portion when a torque is input to the input member, to elastically deform the elastic member so as to engage the output-side engaged portion with the output-side engaging portion, to transmit the torque input to the input member to the output member, and to be displaced so as to approach the pressed surface when a torque is input to the output member in a reverse direction, to elastically deform the elastic member so as to engage the output-side engaging portion with the output-side engaged portion, to press the pressed surface against the pressed surface, and to frictionally engage the pressed surface with the pressed surface.

In one aspect of the present invention, the elastic member may not be fixed to either one of the output member and the engaging piece, but may be elastically sandwiched between the output-side engaging portion and the engaging piece.

In one aspect of the present invention, the elastic member may be fixed to the engaging piece or the output member.

In one aspect of the present invention, displacement of the elastic member in the axial direction of the pressed surface may be restricted based on engagement of the elastic member with the engaging piece.

In one aspect of the present invention, displacement of the elastic member in a second direction orthogonal to both the first direction and the axial direction of the pressed surface can be restricted based on engagement of the elastic member with the engaging piece.

In one aspect of the present invention, the output side engaging portion and the output side engaged portion can be directly engaged (contacted) without using the elastic member when torque is input to the input member and when torque is reversely input to the output member.

In one aspect of the present invention, the output-side engaging portion and the output-side engaged portion may be engaged with each other via the elastic member.

In one aspect of the present invention, the elastic member may be exposed from the engaging piece only at a portion between the output-side engaging portion and the output-side engaged portion when viewed in the axial direction of the pressed surface.

In other words, the elastic member can be disposed, for example, inside the engaging piece except for a portion exposed at a portion between the output side engaging portion and the output side engaged portion.

In one aspect of the present invention, the elastic member may have functions of: in a neutral state in which no torque is input to the input member and the output member, the pressing surface is pressed against the pressed surface by an elastic force applied to the engaging piece.

In one embodiment of the present invention, the elastic member may be formed of a plate spring.

In this case, the output side engaged portion may be constituted by a recess provided in a side surface of the engaging piece on a side farther from the pressed surface in the first direction, and the elastic member may be disposed so as to straddle the output side engaged portion when viewed in an axial direction of the pressed surface.

In one embodiment of the present invention, the elastic member may be formed of a coil spring or a disc spring, or may be formed of rubber containing silicone rubber or the like.

In one aspect of the present invention, the engaging piece may be formed of a single member.

In one aspect of the present invention, the engaging piece may be configured by a plurality of members including an engaging piece main body and a link member.

In this case, the engaging piece main body may have the pressing surface, the output-side engaged portion, and a swing support portion located closer to the pressed surface than the input-side engaging portion in the first direction, and the link member may have a first end portion and a second end portion, the first end portion being swingably coupled to the swing support portion, and the second end portion having the input-side engaged portion and being swingably coupled to the input-side engaging portion. In such a configuration, when a torque is input to the input member, the input-side engagement portion pulls the swing support portion via the link member, and the engagement piece can be displaced so as to be away from the pressed surface.

In one aspect of the present invention, the engaging piece body may include a pair of body plates and a swing support shaft, the pair of body plates may be arranged to overlap and be coupled to each other in an axial direction of the pressed surface, and both axial side portions of the swing support shaft may be supported by the pair of body plates.

Each of the pair of main body plates may have the pressing surface and the output-side engaged portion, the swing support portion may be formed by the swing support shaft, and the link member may be disposed between the pair of main body plates.

In one aspect of the present invention, the engaging piece body may include a pair of intermediate plates sandwiched between the pair of body plates.

The pair of intermediate plates may be disposed on both sides in a second direction orthogonal to both the first direction and the axial direction of the pressed surface in a portion between the pair of main body plates.

The link member may be disposed swingably at an intermediate portion in the second direction in a portion between the pair of main body plates.

In one aspect of the present invention, the input-side engaging portion, the engaging piece, and the elastic member may be configured by a pair of input-side engaging portions, a pair of engaging pieces, and a pair of elastic members arranged so as to sandwich the output-side engaging portion from both sides in the radial direction.

In this case, the pressing member may include a biasing member that is disposed at a position offset from the output-side engaging portion in a second direction orthogonal to both the first direction and the axial direction of the pressed surface, and that is elastically supported (elastically sandwiched) between the pair of engaging pieces.

The effects of the invention are as follows.

According to the present invention, a reverse input disconnect clutch capable of suppressing rattling of an output member is provided.

Drawings

Fig. 1 is a perspective view of a reverse input disconnect clutch according to a first example of the embodiment of the present invention.

Fig. 2 is a view of the reverse input disconnect clutch of the first example viewed from the right in fig. 1 in the axial direction.

Fig. 3 is a sectional view a-a of fig. 2.

Fig. 4 is an exploded perspective view of the reverse input disconnect clutch of the first example.

Fig. 5 is a diagram of the reverse input/disconnection clutch of the first example in a neutral state in which the input member, the input side housing element, and the input side bearing are removed and no torque is reversely input to the output member, as viewed from the right side of fig. 3.

Fig. 6 is a view similar to fig. 5 showing the reverse input disconnect clutch of the first example in a state after torque is input to the input member.

Fig. 7 is a view similar to fig. 5 showing the reverse input/disconnection clutch of the first example in a state after torque is reversely input to the output member.

Fig. 8 is a perspective view of a pair of engaging elements incorporating an elastic member constituting the reverse input disconnect clutch of the first example.

Fig. 9 is a view of a pair of engaging pieces incorporating an elastic member constituting the reverse input/disconnect clutch of the first example viewed from the input member side in the axial direction.

FIG. 10 is a cross-sectional view of B1-O-B2 of FIG. 9.

Fig. 11 is a view of the pair of engaging pieces shown in fig. 9, with one main body plate omitted and viewed from the output member side in the axial direction.

Fig. 12 is an enlarged view of the left-right direction center portion of the upper half portion of fig. 11.

Fig. 13 is a plan view of the pair of engaging pieces shown in fig. 11 as viewed from the radially outer side.

Fig. 14 is an exploded perspective view of a pair of engaging pieces constituting the reverse input disconnect clutch of the first example.

Fig. 15 (a) is a plan view of an elastic member constituting the reverse input disconnection clutch of the first example, fig. 15 (B) is a front view of the elastic member, and fig. 15 (C) is a perspective view of the elastic member.

Fig. 16 is a perspective view of the intermediate plate and the elastic member of the pair of engaging pieces constituting the reverse input disconnect clutch of the first example.

Fig. 17 is a view of the pair of engaging pieces and the output member, in which the elastic member is incorporated, constituting the reverse input/disconnection clutch of the first example, viewed from the input member side in the axial direction.

Fig. 18 is a perspective view of a pair of engaging pieces and an output member incorporating an elastic member constituting the reverse input/disconnection clutch of the first example.

Fig. 19 (a) is a diagram showing the engagement portion between the engagement piece and the input-side engagement portion shown in a state before torque is input to the input member with respect to the reverse input disconnection clutch of the first example, fig. 19 (a) (B) is a diagram showing a state after torque is input to the input member from the state shown in fig. 19 (a), fig. 19 (B) (a) is a diagram showing the engagement portion between the engagement piece and the input-side engagement portion shown in a state before torque is input to the input member with respect to the reverse input disconnection clutch of the structure of the comparative example, and fig. 19 (B) is a diagram showing a state after torque is input to the input member from the state shown in fig. 19 (B) (a).

Fig. 20 (a) is a diagram showing a state before the output side engaging portion and the output side engaged portion are engaged with each other with respect to the reverse input disconnect clutch of the first example, and fig. 20 (B) is a diagram showing a state after the output side engaging portion and the output side engaged portion are engaged with each other with respect to the reverse input disconnect clutch of the first example.

Fig. 21 is a view corresponding to fig. 5 showing a second example of the embodiment of the present invention.

Fig. 22 is a view corresponding to fig. 5, showing a third example of the embodiment of the present invention.

Fig. 23 is a view corresponding to fig. 5, showing a fourth example of the embodiment of the present invention.

Fig. 24 is a diagram showing a conventional reverse input disconnect clutch.

Fig. 25 is a perspective view of a conventional reverse input disconnect clutch.

Fig. 26 is a perspective view showing a part of an input member constituting a conventional reverse input disconnection clutch.

Fig. 27 is a perspective view showing a part of an output member constituting a conventional reverse input/disconnection clutch.

Fig. 28 is a diagram showing a state after torque is input to an input member of a conventional reverse input/disconnection clutch.

Fig. 29 is a diagram showing a state after torque is reversely input to an output member of a conventional reverse input/disconnection clutch.

Detailed Description

[ first example ]

A first example of an embodiment of the present invention will be described with reference to fig. 1 to 20.

In the following description, the axial direction, the radial direction, and the circumferential direction refer to the axial direction, the radial direction, and the circumferential direction of the reverse input disconnection clutch 1, unless otherwise specified. In this example, the axial direction, the radial direction, and the circumferential direction of the reverse input disconnection clutch 1 coincide with the axial direction, the radial direction, and the circumferential direction of the input member 2, and coincide with the axial direction, the radial direction, and the circumferential direction of the output member 3. The reverse input disconnection clutch 1 has one axial side on the right side of fig. 1, 3, 4, 8, 10, 14, and 16, and the other axial side on the left side of fig. 1, 3, 4, 8, 10, 14, and 16.

[ description of the construction of the reverse input disconnect clutch ]

The reverse input disconnect clutch 1 of the present example includes an input member 2, an output member 3, a housing 4 as a pressed member, a pair of engaging pieces 5 as engaging pieces, and a pair of elastic members 56 as elastic members. The reverse input cutoff clutch 1 has a reverse input cutoff function: the torque input to the input member 2 is transmitted to the output member 3, while the torque input in the reverse direction to the output member 3 is completely cut off and not transmitted to the input member 2, or only a part thereof is transmitted to the input member 2 and the remaining part is cut off.

[ input means ]

The input member 2 is connected to an input-side mechanism such as an electric motor, and receives input of torque. As shown in fig. 3 and 4, the input member 2 of the present example includes an input shaft portion 6, a pair of input arm portions 7, and a pair of input-side engagement portions 8 as input-side engagement portions. The input shaft portion 6 has a cylindrical shape, and one axial end thereof is connected to the output portion of the input-side mechanism. The pair of input arm portions 7 extend from the other end portion of the input shaft portion 6 in the axial direction toward the opposite side in the radial direction. Each of the pair of input arm portions 7 has a support hole 9 as an axial through hole at a radially intermediate portion. Each input-side engagement portion 8 of the pair of input-side engagement portions 8 is formed by a cylindrical pin. One axial end of the input-side engagement portion 8 is press-fitted into and fixed to a support hole 9 of the input arm portion 7. In this state, the pair of input-side engagement portions 8 extend from the pair of input arm portions 7 toward one axial side. The input member may be integrally formed (as one member).

[ output Member ]

The output member 3 is connected to an output-side mechanism such as a speed reduction mechanism and outputs torque. The output member 3 is arranged coaxially with the input member 2. As shown in fig. 3 and 4, the output member 3 of the present example includes an output shaft portion 10 and an output-side engagement portion 11. The output shaft 10 has a cylindrical shape, and the other end in the axial direction thereof is connected to the input portion of the output-side mechanism. The output-side engagement portion 11 is substantially in the shape of an elongated circular column and extends from the center of one axial end surface of the output shaft portion 10 to one axial side. As shown in fig. 5, 6, 17, 20 a and 20B, the outer peripheral surface of the output side engagement portion 11 has a pair of guide surfaces 13, which are side surfaces 12 on both sides in the short axis direction (the vertical direction in fig. 5, 6, 17, 20 a and 20B) and side surfaces on both sides in the long axis direction (the horizontal direction in fig. 5, 6, 17, 20 a and 20B).

Each of the pair of side surfaces 12 is formed of a flat surface orthogonal to the short axis direction of the output side engagement portion 11. The pair of guide surfaces 13 are each formed by a convex curved surface. Specifically, each of the pair of guide surfaces 13 is formed by a partially cylindrical convex surface centered on the central axis of the output-side engagement portion 11 (the central axis of the output member 3). Therefore, the output member 3 can use, for example, the outer peripheral surface of the round bar material as the pair of guide surfaces 13, and accordingly, the processing cost can be suppressed. However, in the case of carrying out the present invention, the pair of guide surfaces may be each formed by a partially cylindrical convex surface centered on an axis parallel to the central axis of the output member 3, or a non-cylindrical convex surface such as a partially elliptical cylindrical convex surface. In this example, the output shaft 10 and the output-side engaging portion 11 are integrally formed, but in the case of implementing the present invention, the output member 3 may be formed by joining and fixing the output shaft and the output-side engaging portion, which are manufactured separately from each other, to each other. The output-side engagement portion 11 is disposed radially inward of the pair of input-side engagement portions 8, specifically, at a portion between the pair of input-side engagement portions 8.

[ outer cover ]

As shown in fig. 1 to 4, the housing 4 is a hollow disk-shaped member fixed to another member not shown, and its rotation is restricted. The housing 4 is disposed coaxially with the input member 2 and the output member 3, and accommodates a pair of input-side engaging portions 8, an output-side engaging portion 11, a pair of engaging pieces 5, a pair of elastic members 56, and the like therein. The housing 4 is configured by coupling an output-side housing element (housing main body) 14 disposed on the other axial side and an input-side housing element (housing cover) 15 disposed on one axial side with a plurality of bolts 16.

The output side housing element 14 includes a cylindrical outer diameter side tube portion 17, a cylindrical inner diameter side tube portion 18, and an annular plate-shaped side plate portion 19. The inner diameter side cylindrical portion 18 is disposed coaxially with the outer diameter side cylindrical portion 17 on the other axial side of the outer diameter side cylindrical portion 17. The radially outer end of the side plate 19 is coupled to the axially other end of the outer diameter side tube 17, and the radially inner end of the side plate 19 is coupled to the axially one end of the inner diameter side tube 18.

The outer diameter side tube portion 17 has a pressed surface 20 on the inner peripheral surface. The pressed surface 20 is a cylindrical surface centered on the central axis of the output side housing element 14. The outer peripheral surface of the outer diameter side cylindrical portion 17 at one end in the axial direction has an output side recessed fitting surface 21 having an outer diameter larger than that of a portion adjacent to the other end in the axial direction. The output side recess fitting surface 21 is formed of a cylindrical surface centered on the central axis of the output side case element 14. The outer diameter side cylindrical portion 17 has screw holes 22 opened in a side surface on one axial side at a plurality of positions (eight positions in the illustrated example) equally spaced in the circumferential direction at one axial end portion. The inner diameter side tube portion 18 has an output side bearing fitting surface 23 in a portion from an end portion on one axial side to an intermediate portion of the inner peripheral surface. The output side bearing fitting surface 23 is formed of a cylindrical surface centered on the central axis of the output side housing element 14. That is, the pressed surface 20, the output side recess fitting surface 21, and the output side bearing fitting surface 23 are arranged coaxially with each other.

The input-side housing element 15 includes a cylindrical outer diameter side tube portion 24, a cylindrical inner diameter side tube portion 25, and an annular plate-shaped side plate portion 26. The inner diameter side cylindrical portion 25 is disposed coaxially with the outer diameter side cylindrical portion 24 on one axial side of the outer diameter side cylindrical portion 24. The radially outer end of the side plate 26 is coupled to the axially one end of the outer diameter side tube 24, and the radially inner end of the side plate 26 is coupled to the axially other end of the inner diameter side tube 25.

The outer diameter side tube portion 24 has an input side pocket fitting surface 27 on the inner peripheral surface. The input-side pocket fitting surface 27 is formed of a cylindrical surface centered on the central axis of the input-side housing element 15. The input-side recess fitting surface 27 has an inner diameter dimension that allows fitting without rattling with respect to the output-side recess fitting surface 21 of the output-side housing element 14. The side plate 26 has through holes 28 at a plurality of locations at equal intervals in the circumferential direction of the radially outer end portion that match the screw holes 22 of the output side case element 14. The inner diameter side tube portion 25 has an input side bearing fitting surface 29 in a portion from the end portion on the other axial side to the intermediate portion of the inner peripheral surface. The input-side bearing fitting surface 29 is formed of a cylindrical surface centered on the central axis of the input-side housing element 15. That is, the input-side pocket fitting surface 27 and the input-side bearing fitting surface 29 are arranged coaxially with each other.

The housing 4 is assembled by fitting the input-side recess fitting surface 27 of the input-side housing element 15 to the output-side recess fitting surface 21 of the output-side housing element 14 without rattling, and by screwing and further fastening the bolts 16 inserted through the through holes 28 of the input-side housing element 15 to the screw holes 22 of the output-side housing element 14, the output-side housing element 14 and the input-side housing element 15 are fixed to each other. In this example, the output-side pocket fitting surface 21 and the output-side bearing fitting surface 23 of the output-side housing element 14 are arranged coaxially with each other, and the input-side pocket fitting surface 27 and the input-side bearing fitting surface 29 of the input-side housing element 15 are arranged coaxially with each other. Therefore, in the assembled state of the housing 4 in which the output-side pocket fitting surface 21 and the input-side pocket fitting surface 27 are fitted without rattling, the input-side bearing fitting surface 29 and the output-side bearing fitting surface 23 are arranged coaxially with each other.

In a state where the housing 4 is assembled, the input shaft portion 6 of the input member 2 is supported by the input-side bearing 57 so as to be rotatable with respect to the input-side bearing fitting surface 29 of the input-side housing element 15. The output shaft 10 of the output member 3 is supported by the output bearing 58 so as to be rotatable with respect to the output bearing fitting surface 23 of the output housing member 14. Thereby, the input member 2 and the output member 3 are arranged coaxially with each other and with respect to the pressed surface 20 of the housing 4. In this state, the pair of input-side engaging portions 8 and the output-side engaging portion 11 are disposed radially inward of the pressed surface 20 of the housing 4. In addition, in the reverse input disconnection clutch 1, when it is desired to set the performance (lock release performance) of switching the locked or half-locked state to the unlocked state described below to a high level, it is necessary to strictly manage the coaxiality and inclination of the input member 2 and the output member 3. In this case, a general bearing utilization method, that is, a method of changing the input-side bearing 57 and the output-side bearing 58 from the illustrated single-row rolling bearing to a multiple-row rolling bearing, or the like, can be applied.

[ engaging member ]

The pair of engaging pieces 5 are disposed radially inward of the pressed surface 20. Each of the engaging pieces 5 of the pair of engaging pieces 5 is constituted by a plurality of members including an engaging piece main body 30 and a link member 31 swingably coupled to the engaging piece main body 30.

Clamping piece main body

As shown in fig. 8 to 11, 13, and 14, the engaging piece body 30 is configured by combining a plurality of members. Hereinafter, the structure of each member constituting the engaging piece body 30 will be described after the structure of the assembled engaging piece body 30 will be described.

The engaging piece body 30 is substantially semicircular plate-shaped, and includes a pair of pressing surfaces 32 facing the pressed surface 20, a swing support shaft 33 as a swing support portion, and an output side engaged portion 34 engaged with the output side engaging portion 11.

In this example, the outer peripheral surface of the engaging piece body 30 is constituted by a convex arc-shaped radial outer side surface corresponding to the arc of the engaging piece body 30 and a crank-shaped radial inner side surface corresponding to the chord of the engaging piece body 30. The radial direction of the engaging piece body 30 is a direction indicated by an arrow a in fig. 5 perpendicular to a chord of the engaging piece body 30. The width direction of the engaging piece body 30 is a direction indicated by an arrow B in fig. 5, which is parallel to a chord of the engaging piece body 30. In this example, the radial direction of the engaging piece body 30 is a direction in which the engaging piece body 30 (the engaging piece 5) moves away from or approaches the pressed surface 20, and corresponds to the first direction. The width direction of the engaging piece body 30 corresponds to a second direction orthogonal to the first direction and the axial direction of the pressed surface 20.

In this example, the pair of engaging pieces 5 are disposed radially inward of the pressed surface 20 with the radially outer side surfaces of the engaging piece bodies 30 facing away from each other and the radially inner side surfaces of the engaging piece bodies 30 facing each other. The inner diameter dimension of the pressed surface 20 and the radial dimension of the engaging piece main body 30 are regulated so that, in a state where the pair of engaging pieces 5 are arranged radially inward of the pressed surface 20, a gap that allows the engaging piece main body 30 to move in the radial direction exists in at least one of a portion between the pressed surface 20 and the radially outer surface of the engaging piece main body 30 and a portion between the radially inner surfaces of the engaging piece main body 30.

In this example, the engaging piece body 30 has a pair of pressing surfaces 32 on the radial outer side surface. The pair of pressing surfaces 32 are portions that are pressed against the pressed surfaces 20 in the locked state or the half-locked state of the output member 3, and are circumferentially spaced apart from each other on both circumferential sides of the radially outer surface of the engaging piece body 30. Each of the pair of pressing surfaces 32 protrudes toward the pressed surface 20 from a portion of the radially outer surface of the engaging piece body 30 that is offset from the pressing surface 32 in the circumferential direction. The pressing surface 32 is formed of a partially cylindrical convex surface having a smaller radius of curvature than the radius of curvature of the pressed surface 20. A portion of the radially outer surface of the engaging piece body 30 that is circumferentially offset from the pair of pressing surfaces 32 (a portion circumferentially located between the pair of pressing surfaces 32) is a non-contact surface that does not contact the pressed surface 20.

The engaging piece body 30 has an internal space 35 in a thickness direction (axial direction) center portion of a width direction center portion. The end portions of the inner space 35 on both sides in the radial direction are open on the outer surface and the inner surface of the engaging piece body 30 in the radial direction, respectively. The engaging piece body 30 has a swing support shaft 33 disposed in the axial direction, and an axial intermediate portion of the swing support shaft 33 is disposed at a radially outer portion of a widthwise central portion of the internal space 35. The swing support shaft 33 is formed of a cylindrical pin, and its end portions on both axial sides are supported by portions of the engaging piece body 30 that sandwich the internal space 35 from both axial sides.

The engaging piece body 30 has an output-side engaged portion 34 at a widthwise central portion of a radially inner side surface. The output-side engaged portion 34 is formed of a substantially rectangular recess that is recessed radially outward from a widthwise central portion of a radially inner surface (a side surface on a side farther from the pressed surface 20) of the engaging piece body 30.

As shown in fig. 5, 6, 20 (a), and 20 (B), the output-side engaged portion 34 has a size such that the first half in the short-axis direction of the output-side engaging portion 11 can be disposed inside thereof. In particular, in this example, as shown in fig. 6 and 20 (B), the output side engaged portion 34 has an inner surface shape conforming to the outer peripheral surface of the front half portion in the short axis direction of the output side engaging portion 11.

The inner surface of the output-side engaged portion 34 has a bottom surface 36 and a pair of guided surfaces 37. The bottom surface 36 is a flat surface perpendicular to the radial direction of the engaging piece body 30. The pair of guided surfaces 37 are located at both ends of the inner surface of the output-side engaged portion 34 in the width direction of the engaging piece main body 30, and face each other in the width direction. The pair of guided surfaces 37 is formed by a pair of concave curved surfaces that are inclined in a direction in which the distance between the concave curved surfaces increases as they extend radially inward of the engaging piece body 30, that is, as they extend radially away from the pressed surface 20 of the engaging piece body 30.

Each of the guided surfaces 37 of the pair of guided surfaces 37 is capable of contacting the guide surface 13 of the output-side engagement portion 11, and is formed of a partially cylindrical concave surface having the same radius of curvature as the guide surface 13 or a radius of curvature slightly larger than the guide surface 13. In this example, as shown in fig. 6 and 20 (B), the output side engaged portion 34 has an inner surface shape conforming to the outer peripheral surface of the front half portion in the short axis direction of the output side engaging portion 11. Therefore, the bottom surface 36 of the output-side engaged portion 34 can be brought into surface contact with the side surface 12 of the output-side engaging portion 11, and the pair of guided surfaces 37 of the output-side engaged portion 34 can be brought into surface contact with the first half portion in the short-axis direction of the pair of guide surfaces 13 of the output-side engaging portion 11. In the case of carrying out the present invention, the guided surface may be a non-cylindrical concave surface such as a concave surface having a partially elliptical cylindrical shape.

In this example, at the time of assembling the reverse input disconnection clutch 1, in order to allow the output side engagement portion 11 to be inserted with some play between the bottom surfaces 36 of the pair of output side engaged portions 34 that are opposed in the radial direction, the dimensions of the respective portions are limited so that the interval between the pair of bottom surfaces 36 is larger than the thickness dimension in the short axis direction of the output side engagement portion 11 (the interval between the side surfaces 12) in the state after the reverse input disconnection clutch 1 is assembled.

The engaging piece body 30 has an insertion hole 38 at a radially inner portion of the widthwise central portion. The insertion hole 38 is formed by an arc-shaped long hole that axially penetrates through a radially inner portion of the widthwise central portion of the engaging piece body 30 and extends in the circumferential direction. The insertion hole 38 has a size that allows the input-side engagement portion 8 to be loosely inserted. Specifically, when the input-side engaging portion 8 is inserted into the insertion hole 38, a gap in the circumferential direction and a gap in the radial direction of the engaging piece main body 30 exist between the input-side engaging portion 8 and the inner surface of the insertion hole 38. Therefore, the input-side engaging portion 8 can be displaced in the rotational direction of the input member 2 relative to the engaging piece main body 30 due to the presence of the gap in the circumferential direction, and the engaging piece main body 30 can be displaced in the radial direction of the engaging piece main body 30 relative to the input-side engaging portion 8 due to the presence of the gap in the radial direction of the engaging piece main body 30. In other words, the size of the insertion hole 38 is limited so that the inner peripheral edge of the insertion hole 38 does not interfere with the input-side engagement portion 8 and hinder the operation of the reverse input/disconnection clutch 1 described below.

The engaging piece body 30 is formed by combining a plurality of members. Specifically, the engaging piece body 30 includes a pair of body plates 40, a pair of intermediate plates 41, a swing support shaft 33, a plurality of bolts 42 as coupling members, and a plurality of nuts 43.

The pair of main body plates 40 are members constituting both side portions in the thickness direction of the engaging piece main body 30, and are arranged to overlap in the axial direction. Each of the pair of main body plates 40 is a press-formed product produced by punching a metal plate such as a steel plate by a press process, and has a substantially semicircular plate shape. The main body plate 40 has convex surfaces 44 constituting the pressing surface 32 in a state where the engaging piece main body 30 is assembled, at two positions separated in the circumferential direction in the radial outer surface. The main body plate 40 has a circular support hole 45 at a widthwise central portion of a radially outer portion. The main body plate 40 has a recess 46 constituting the output side engaged portion 34 in a state where the engaging piece main body 30 is assembled, at a widthwise central portion of the radially inner side surface. Therefore, in this example, the pair of recesses 46 arranged so as to be separated in the axial direction constitute the output-side engaged portion 34. The main plate 40 has a through hole 47 that constitutes the insertion hole 38 in a state where the engaging piece main body 30 is assembled, at a widthwise central portion of the radially inner portion. The main body plate 40 has a plurality of (three in the illustrated example) through holes 48 on both sides in the width direction. The main body plate 40 has positioning holes 49 at both sides in the width direction and at positions offset from the plurality of through holes 48.

The pair of intermediate plates 41 constitute intermediate portions in the thickness direction of the engaging piece body 30. Each of the intermediate plates 41 of the pair of intermediate plates 41 is a press-formed product produced by punching a metal plate such as a steel plate by a press working, and has a substantially fan-plate shape. The pair of intermediate plates 41 are sandwiched between the pair of main body plates 40 at both widthwise sides. The pair of intermediate plates 41 are positioned radially inward of the pair of main body plates 40, and do not contact the pressed surface 20. The pair of intermediate plates 41 have, in the widthwise central half of the radially inner surface, a housing recess 39 slightly recessed radially outward from the widthwise outer half. The widthwise outer half portions of the radially inner surfaces of the pair of intermediate plates 41 are flush with the widthwise both side portions of the radially inner surfaces of the pair of main plates 40. The pair of intermediate plates 41 have through holes 50 at a plurality of locations that match the through holes 48 of the pair of main body plates 40, respectively. The pair of intermediate plates 41 have positioning holes 51 at positions matching the positioning holes 49 of the pair of main body plates 40.

The pair of main body plates 40 and the pair of intermediate plates 41 are coupled and fixed to each other by screwing nuts 43 to tip portions of a plurality of bolts 42 inserted through holes 48 of the pair of main body plates 40 and through holes 50 of the pair of intermediate plates 41 that match each other, and further fastening them. In the structure of this example, when performing such a coupling and fixing operation, the positioning rods for operation are inserted into the positioning holes 49 of the pair of main body plates 40 and the positioning holes 51 of the pair of intermediate plates 41 that are aligned with each other, so that the operation of aligning the through holes 48 of the pair of main body plates 40 and the through holes 50 of the pair of intermediate plates 41 can be easily performed. In the configuration of this example, the internal space 35 is formed between the pair of main body plates 40 and between the pair of intermediate plates 41 in the width direction in a state where the pair of main body plates 40 and the pair of intermediate plates 41 are fixed in combination.

The swing support shaft 33 is constituted by a cylindrical pin. The end portions of the swing support shaft 33 on both axial sides are press-fitted into and fixed to the support holes 45 of the pair of body plates 40. The axially intermediate portion of the swing support shaft 33 is disposed in the internal space 35.

Connecting rod parts

The link member 31 is a press-formed product produced by punching a metal plate such as a steel plate by press working, has a substantially rectangular plate shape or a substantially oblong circular plate shape, and is disposed in the internal space 35 (between the pair of main body plates 40) of the engaging piece main body 30.

The thickness dimension of the link member 31 is smaller than the axial width dimension of the internal space 35 (i.e., the distance between the side surfaces of the pair of main body plates 40 facing each other, i.e., the thickness dimension of the intermediate plate 41). The link member 31 has a first hole 53 at a first end 52, which is one end in the longitudinal direction, and a second hole 55 corresponding to an input-side engaged portion at a second end 54, which is the other end in the longitudinal direction.

The swing support shaft 33 is inserted through the first hole 53. Thereby, the first end portion 52 is swingably coupled to the swing support shaft 33. The input-side engagement portion 8 is inserted through the second hole 55. Thereby, the second end portion 54 is swingably coupled to the input-side engagement portion 8.

The first hole 53 has an inner diameter larger than the outer diameter of the swing support shaft 33, and the second hole 55 has an inner diameter larger than the outer diameter of the input-side engagement portion 8. In this example, as shown in fig. 5, in a state where the pair of pressing surfaces 32 of the engaging piece 5 are in contact with the pressed surfaces 20 and the input-side engaging portion 8 is located at the widthwise central portion of the engaging piece body 30, as shown in fig. 12, the interval Wa between the end edges on the sides away from each other of the swing support shaft 33 and the input-side engaging portion 8 is set to be equal to or less than the interval Wb between the end edges on the sides away from each other of the first hole 53 and the second hole 55 (Wa ≦ Wb). The difference Wb-Wa between the intervals Wa and Wb is preferably as large as possible from the viewpoint of facilitating assembly of the reverse input/disconnect clutch 1, but is preferably as small as possible from the viewpoint of enabling the engaging piece 5 to move radially inward immediately after torque is input to the input member 2 to achieve the unlocked state as will be described later.

Elastic Member

As shown in fig. 5 to 7 and 17, the pair of elastic members 56 are disposed at positions overlapping the output side engagement portion 11 in the radial direction of the engaging piece main body 30 corresponding to the first direction. In other words, the pair of elastic members 56 are disposed on both sides of the output side engagement portion 11 in the short axis direction of the output side engagement portion 11. In a neutral state in which no torque is applied to each of the input member 2 and the output member 3, each of the pair of elastic members 56 elastically stays between the output side engaging portion 11 and the engaging piece 5 (elastically deforms), and presses the output side engaging portion 11 radially inward and presses the engaging piece 5 radially outward.

In this example, the pair of elastic members 56 have a function of pressing the pressing surfaces 32 of the pair of engaging pieces 5 against the pressed surface 20 by an elastic force applied to the pair of engaging pieces 5 in the neutral state. In the neutral state, the pressing surfaces 32 of the pair of engaging pieces 5 are pressed against the pressed surface 20 (are brought into contact with the pressed surface 20 in advance) in advance in order to achieve the locked state immediately after torque is reversely input to the output member 3.

Each of the pair of elastic members 56 is elastically sandwiched between the output-side engaging portion 11 and the engaging piece 5 without being fixed to any one of the output member 3 and the engaging piece 5. However, in the case of implementing the present invention, the elastic member 56 can be fixed to both the engaging piece and the output member. When the elastic member 56 is fixed to the engaging piece or the output member, various conventionally known fixing methods such as screwing, caulking, and bonding can be employed.

In this example, as shown in fig. 11 and 14 to 16, the elastic member 56 is formed of a crank-shaped plate spring. Specifically, the elastic member 56 has substantially the same shape as the outline shape of the radially inner surface of the engaging piece 5 (the engaging piece body 30). That is, the elastic member 56 has linear portions on both longitudinal side portions and a substantially U-shaped convex portion in a longitudinal middle portion. The elastic member 56 is symmetrical with respect to the longitudinal direction. The elastic member 56 is manufactured by, for example, pressing a metal plate such as a spring steel plate or a stainless steel plate. The width dimension (plate width) W of the elastic member 56 is the same as the thickness dimension of the intermediate plate 41 or slightly smaller than the thickness dimension of the intermediate plate 41. The thickness dimension (plate thickness) T of the elastic member 56 is the same as the depth dimension of the housing recess 39 provided on the radially inner surface of the intermediate plate 41, or is smaller than the depth dimension of the housing recess 39.

The elastic member 56 includes a pair of support plate portions 59, a pressing plate portion 60, and a pair of connecting plate portions 61. Each of the pair of support plate sections 59 is formed in a long plate shape and is disposed on both longitudinal side portions of the elastic member 56. The pressing plate portion 60 is formed in a long plate shape, is substantially parallel to the pair of support plate portions 59, and is disposed at a longitudinal center portion of the elastic member 56. Each of the connecting plates 61 of the pair of connecting plate portions 61 is bent substantially in an S-shape, extends in the plate thickness direction of the pair of support plate portions 59 and the pressing plate portion 60, and is disposed between the pair of support plate portions 59 and the pressing plate portion 60. The pair of connecting plate portions 61 are disposed in non-parallel with each other, and are inclined in a direction in which the distance between the pair of support plate portions 59 increases as the distance from the pressing plate portion 60 increases in the plate thickness direction. The interval between the pair of connecting plate portions 61 is slightly larger than the interval between the pair of guided surfaces 37 constituting the inner surface of the output-side engaged portion 34.

As shown in fig. 11 and 16, the elastic member 56 is disposed in a portion bridging the pair of intermediate plates 41 constituting the engaging piece body 30 in the width direction and between the pair of main body plates 40. Therefore, as shown in fig. 5 and 9, when viewed in the axial direction, most of the elastic member 56 (the pair of support plate portions 59 and the pair of connecting plate portions 61) are covered with the main body plate 40, and only the pressing plate portion 60 is exposed from the engaging piece main body 30 inside the output-side engaged portion 34 (the recessed portion 46). Therefore, most of the elastic member 56 is disposed inside (inside) the engaging piece body 30. The axial direction view is a state viewed from the axial direction (axial direction) of the input member 2 and the output member 3, and fig. 5 and 9 are states viewed from the front-back direction of the paper surface. The axial directions of the input member 2 and the output member 3 coincide with the axial direction of the pressed surface 20.

The pair of support plate portions 59 are in surface contact with the bottom surfaces of the receiving recesses 39 of the pair of intermediate plates 41, and are axially engaged with the radially inner ends of the pair of main body plates 40. Thereby, the elastic member 56 is restricted from displacement in the axial direction by the engagement of the pair of support plate portions 59 with the pair of main body plates 40. Further, the elastic member 56 is restricted from being displaced radially outward by the engagement between the pair of support plate portions 59 and the pair of intermediate plates 41.

The pair of connecting plate portions 61 are engaged with the radially inner end portions of the width direction center side portions of the pair of intermediate plates 41 in the width direction (second direction) of the engaging piece body 30. Thereby, the elastic member 56 is restricted from displacement in the width direction (second direction) of the engaging piece body 30 by the engagement of the pair of connecting plate portions 61 and the pair of intermediate plates 41.

The pressing plate portion 60 is disposed between the pair of intermediate plates 41 in the width direction, and is displaceable (elastically deformable) in the radial direction. As shown in fig. 9, in the free state of the elastic member 56, the pressing plate portion 60 is positioned slightly radially inward of the bottom surface 36 of the output-side engaged portion 34 (the bottom surface of the recess 46 provided in the main body plate 40), and is disposed substantially parallel to the bottom surface 36 of the output-side engaged portion 34.

As shown in fig. 5, 17, and 20 (a), in a neutral state in which the elastic member 56 is disposed between the output side engaging portion 11 and the engaging piece 5 and no torque is applied to the input member 2 and the output member 3, the pressing plate portion 60 is in surface contact with the side surface 12 of the output side engaging portion 11 and slightly deforms by flexing radially outward. Therefore, the elastic member 56 elastically supports (elastically deforms) between the output-side engaging portion 11 and the engaging piece 5. Thereby, the pair of support plate portions 59 elastically press the bottom surfaces of the housing recesses 39 of the pair of intermediate plates 41 toward the radial outside, and the pressing plate portion 60 elastically presses the side surface 12 of the output-side engaging portion 11 toward the radial inside. In this state, only the pressing plate portion 60 of the elastic member 56 is exposed between the output-side engaging portion 11 and the output-side engaged portion 34.

As described below, when a torque is input to the input member 2 (see fig. 6 and 20B) and when a torque is reversely input to the output member 3 (see fig. 7), the elastic member 56 is elastically deformed so as to displace the pressing plate portion 60 radially outward, and allows the output side engaging portion 11 to be directly engaged (contacted) with the output side engaged portion 34. That is, the pressing plate portion 60 retreats radially outward (the internal space 35), whereby the output-side engaging portion 11 and the output-side engaged portion 34 are directly engaged without passing through the pressing plate portion 60.

In the assembled state of the reverse input cutoff clutch 1 of the present example, the pair of input-side engaging portions 8 of the input member 2 disposed on one axial side are inserted in the axial direction into the insertion holes 38 (the through holes 47 of the pair of main body plates 40) and the second holes 55 of the pair of engaging elements 5, and the output-side engaging portion 11 of the output member 3 disposed on the other axial side is inserted in the axial direction between the output-side engaged portions 34 of the pair of engaging elements 5. That is, the pair of engaging pieces 5 are arranged with the output side engaging portion 11 sandwiched from the radial outside by the output side engaged portions 34.

[ description of operation of reverse input disconnect Clutch ]

When torque is input to the input member 2 from the input-side mechanism, as shown in fig. 6, the input-side engagement portion 8 rotates in the rotational direction of the input member 2 (clockwise in the example of fig. 6) inside the insertion hole 38 of the engagement piece body 30. Then, the link member 31 swings about the swing support shaft 33, and the input-side engagement portion 8 pulls the swing support shaft 33 via the link member 31, thereby moving each of the pair of engagement pieces 5 in a direction (radially inward) away from the pressed surface 20. Thereby, the pressing surfaces 32 of the pair of engaging pieces 5 are separated from the pressed surfaces 20, and the pair of elastic members 56 are elastically deformed so as to displace the entire pressing plate portion 60 outward in the radial direction. In other words, the pair of elastic members 56 are elastically deformed so as to displace the pair of support plate portions 59 radially inward. The pair of output-side engaged portions 34 sandwich the output-side engaging portion 11 of the output member 3 from both sides in the radial direction, and the output-side engaging portion 11 is engaged with the pair of output-side engaged portions 34 without rattling. As a result, the torque input to the input member 2 is transmitted to the output member 3 via the pair of engaging pieces 5, and is output from the output member 3.

In particular, in the structure of this example, when the pair of engaging pieces 5 move in the direction (radially inward) away from the pressed surface 20 as described above, as shown in fig. 5 to 6 and fig. 20 (a) to 20 (B), the pair of guided surfaces 37 provided in the output-side engaged portion 34 are guided by the pair of guide surfaces 13 provided in the output-side engaging portion 11, whereby the movement of the engaging pieces 5 in the width direction is restricted. As shown in fig. 6 and 20 (B), the bottom surface 36 of the output-side engaged portion 34 is in surface contact with the side surface 12 of the output-side engaging portion 11, and the pair of guided surfaces 37 of the output-side engaged portion 34 is in surface contact with the pair of guide surfaces 13 of the output-side engaging portion 11. Therefore, in the structure of this example, after the locked or unlocked state is released, the engaging piece 5 can be effectively prevented from moving away in the width direction and coming into contact with the pressed surface 20. In the structure of this example, since the above-described guide for the movement of the engaging piece 5 to the radially inner side can be performed using the output-side engaging portion 11, the number of components can be reduced as compared with a structure in which other components for performing the guide are assembled.

In the structure of this example, the pair of guided surfaces 37 of the output-side engaged portion 34 is formed of a pair of concave curved surfaces that are inclined in a direction in which the distance therebetween increases toward the radially inner side, and the pair of guide surfaces 13 of the output-side engaging portion 11 is formed of a pair of convex curved surfaces that match the pair of concave curved surfaces. Therefore, as shown in fig. 20 a, in a state where the engaging piece 5 is spaced radially outward from the output-side engaging portion 11, a gap is formed between the pair of guided surfaces 37 and the pair of guide surfaces 13, and the size (width-direction dimension) of the gap increases as it goes radially outward. Therefore, in the structure of this example, in a state where the engaging piece 5 is spaced radially outward from the output-side engaging portion 11, the movement of the engaging piece 5 in the width direction and the rotation direction can be appropriately permitted, and it is possible to effectively prevent an unreasonable force from being applied to the engaging piece 5.

On the other hand, when torque is reversely input from the output-side mechanism to the output member 3, the output-side engaging portion 11 rotates in the rotational direction of the output member 3 (clockwise direction in the example of fig. 7) inside the pair of output-side engaged portions 34 as shown in fig. 7. Then, the pair of elastic members 56 are elastically deformed so as to displace a part of the pressing plate portion 60 radially outward, and the bottom surface 36 of the output-side engaged portion 34 is directly pressed radially outward, at the corner portion, which is the connecting portion between the side surface 12 of the output-side engaging portion 11 and the guide surface 13. Thereby, the pair of engaging pieces 5 are moved in the direction approaching the pressed surface 20 (radially outward), and the pressing surfaces 32 of the pair of engaging pieces 5 are pressed against the pressed surface 20, whereby the pressing surfaces 32 are frictionally engaged with the pressed surface 20. As a result, the torque reversely input to the output member 3 is transmitted to the housing 4 fixed to another member and not rotating, and is completely cut off and not transmitted to the input member 2, or only a part of the torque reversely input to the output member 3 is transmitted to the input member 2 and the remaining part is cut off.

In order to completely block torque reversely input to the output member 3 without being transmitted to the input member 2, the pair of engaging pieces 5 are supported (held) between the output-side engaging portion 11 and the pressed surface 20 so that the pressing surface 32 does not slide (relatively rotate) with respect to the pressed surface 20, and the output member 3 is locked. On the other hand, in order to transmit only a part of the torque reversely input to the output member 3 to the input member 2 and cut off the remaining part, the pair of engaging pieces 5 are held (sandwiched) between the output side engaging portion 11 and the pressed surface 20 so that the pressing surface 32 slides with respect to the pressed surface 20, thereby half-locking the output member 3. When torque is further reversely input to the output member 3 in a state where the output member 3 is half-locked, the pair of engaging pieces 5 rotate about the rotation center of the output member 3 while sliding the pressing surface 32 with respect to the pressed surface 20 based on the engagement between the output-side engaging portion 11 and the output-side engaged portion 34. When the pair of engaging pieces 5 rotate, the input-side engaging portion 8 is pulled by the swing support shaft 33 via the link member 31, and a part of the torque is transmitted to the input member 2.

In this example, since each of the pair of engaging pieces 5 has the pressing surface 32 at two locations separated in the circumferential direction on the outer surface in the radial direction of the engaging piece body 30, the frictional engagement force between the pressed surface 20 and the pressing surface 32 can be increased by the wedge effect after the torque is reversely input to the output member 3. However, in the case of implementing the present invention, a structure having a pressing surface only at one circumferential position on the radially outer surface of the engaging piece body may be employed.

According to the reverse input/disconnection clutch 1 of the present embodiment, rattling of the output member 3 can be suppressed. That is, in this example, the pair of elastic members 56 are disposed at positions overlapping the output side engaging portion 11 in the radial direction of the engaging piece main body 30 corresponding to the first direction, and elastically supported between the output side engaging portion 11 and the pair of engaging pieces 5 (elastically deformed). Therefore, the output-side engagement portion 11 can be elastically sandwiched from both sides in the radial direction by the pair of elastic members 56. Therefore, as in this example, in consideration of the workability of assembling the reverse input disconnection clutch 1, even when the interval between the pair of bottom surfaces 36 in the state after assembling the reverse input disconnection clutch 1 is somewhat larger than the thickness dimension (the interval between the side surfaces 12) in the short axis direction of the output side engagement portion 11, the output side engagement portion 11 can be prevented from rotating with a light force regardless of the gap existing between the output side engagement portion 11 and the output side engaged portion 34, and the rattling of the output member 3a can be suppressed. Accordingly, when the reverse input/disconnection clutch 1 of the present example, which is used for applications such as position adjustment of a stage fixed to a nut, steering angle adjustment of a tire, and the like, in which an output member 3 is coupled to a screw shaft of a ball screw device and an input member 2 is coupled to an electric motor, is applied to the output member 3, even if torque is reversely input from the stage or the tire to the output member 3 via the nut, the position of the stage or the steering angle of the tire can be prevented from being drastically displaced from the adjusted position (the displacement can be made slow), and noise can be prevented from being generated.

In this example, each of the pair of elastic members 56 is not fixed to any one of the output member 3 (output-side engaging portion 11) and the engaging piece 5, but is elastically sandwiched between the output-side engaging portion 11 and the engaging piece 5. Therefore, the work for fixing the elastic member 56 can be omitted, and the members for fixing can be reduced. As a result, the manufacturing cost of the reverse input disconnection clutch 1 can be reduced. Further, since the installation space of the elastic member 56 can be kept small, the reverse input/disconnection clutch 1 can be downsized.

By engaging the elastic member 56 with the engaging piece 5 (the main body plate 40 and the intermediate plate 41), the elastic member 56 can be restricted from being displaced in the axial direction, the width direction, and the radial direction. Therefore, even if the elastic member 56 is not fixed to either the output member 3 or the engaging piece 5, it is possible to suppress the deviation of the installation position of the elastic member 56 or the falling of the elastic member 56 from between the output side engaging portion 11 and the engaging piece 5. Therefore, the elastic member 56 can apply an elastic force of a desired magnitude and direction to the engaging member 5 and the output-side engaging portion 11.

The elastic member 56 is formed of a plate spring, and is formed in a crank shape having substantially the same contour shape as the radially inner surface of the engaging piece 5 (the engaging piece body 30). Therefore, the installation space of the elastic member 56 can be sufficiently reduced. Further, since the portions (the pair of support plate portions 59 and the pair of connecting plate portions 61) of the elastic member 56 other than the pressing plate portion 60 that applies the elastic force to the output-side engaging portion 11 are disposed inside the engaging piece main body 30, the installation space of the elastic member 56 can be reduced from this point of view as well. Further, by providing the elastic member 56, the reverse input/disconnection clutch 1 can be prevented from being increased in size.

The elastic member 56 has a function of pressing the pressing surface 32 of the engaging piece 5 against the pressed surface 20 in the neutral state. Therefore, it is not necessary to provide a dedicated member (biasing means such as a spring) for pressing the pressing surface 32 of the engaging piece 5 against the pressed surface 20 in advance in the neutral state. Therefore, the number of components can be reduced, and the reverse input disconnect clutch 1 can be downsized.

According to the reverse input disconnect clutch 1 of the present embodiment, when torque is input to the input member 2, switching from the locked or half-locked state to the unlocked state can be smoothly performed. This point will be described with reference to fig. 19 (a) and 19 (B).

Fig. 19 (a) and 19 (a) (b) show the structure of the present example, and show the positional relationship between a part of the input member 2 and a part of the engaging piece 5. More specifically, (a) of fig. 19 shows the above positional relationship in the following state: in the locked or unlocked state shown in fig. 7, the input-side engagement portion 8 is located at the widthwise central portion of the engagement piece 5, and the link member 31 is located closest to the radially inner side. Fig. 19 (a) (b) shows the above positional relationship in the following state: when a torque T is input to the input member 2 from the state shown in fig. 19 (a) and (a), the input-side engagement portion 8 rotates in the rotational direction of the input member 2 (clockwise direction in the illustrated example), and a translational load F starts to act on the swing support shaft 33 from the input-side engagement portion 8 via the link member 31.

On the other hand, (B) (a) of fig. 19 and (B) of fig. 19 are structures relating to a comparative example, that is, structures having the same structure as the above-described conventional structure except that the input-side engaging portion 107z of the input member 102z has a cylindrical shape, and show a positional relationship between a part of the input member 102z and a part of the engaging piece 105. More specifically, (B) (a) of fig. 19 shows the above positional relationship in the following state: in the locked or unlocked state, the input-side engagement portion 107z is located at the widthwise central portion of the engagement piece 105. Fig. 19 (B) shows the above positional relationship in the following state: when a torque T is input to the input member 102z from the state shown in fig. 19 (B) and (a), the input-side engaging portion 107z rotates in the rotational direction of the input member 102z (clockwise in the illustrated example), the input-side engaging portion 107z abuts against the input-side engaged portion 113 of the engaging piece 105, and a translational load Ft due to the torque T starts to act on the abutting portion X between the input-side engaging portion 107z and the input-side engaged portion 113.

In the structure of the comparative example, as shown in fig. 19 (B) and (B), the direction of the translational load Ft, that is, the direction of the load acting on the engaging piece 105 from the input member 102z is greatly inclined with respect to the direction in which the engaging piece 105 should move when switching from the locked or semi-locked state to the unlocked state, that is, the radial direction of the engaging piece 105 (the direction in which the engaging piece 105 moves away from or approaches the pressed surface).

In contrast, in the structure of this example, as shown in fig. 19 (a) and (b), the direction of the translational load F, that is, the direction of the load acting on the engaging piece 5 from the input member 2 is a direction substantially parallel to the direction in which the engaging piece 5 should move when switching from the locked state or the semi-locked state to the unlocked state, that is, the radial direction of the engaging piece 5 (the direction in which the engaging piece 5 moves away from or approaches the pressed surface 20). In other words, the angle formed by the direction of the translational load F and the direction in which the engaging piece 5 should move is smaller than the angle formed by the direction of the translational load Ft and the direction in which the engaging piece 105 should move in the structure of the comparative example. That is, in the structure of this example, the torque T input to the input member 2 can be efficiently converted into the load for moving the engaging piece 5 radially inward. Therefore, according to the structure of this example, when torque is input to the input member 2, switching from the locked or half-locked state to the unlocked state can be smoothly performed.

The size of the gap G (the difference Wb-Wa described above) between the radially inner surface of the input-side engaging portion 8 and the inner peripheral surface of the second hole 55 of the link member 31 in the state shown in fig. 19 a (a) in the structure of this example and the size of the gap Gz between the radially inner surface of the input-side engaging portion 107z and the input-side engaged portion 113 in the state shown in fig. 19B (a) in the structure of the comparative example are preferably as large as possible from the viewpoint of facilitating the assembly of the reverse input disconnection clutch, but are preferably as small as possible from the viewpoint of enabling the engaging pieces 5, 105 to be moved radially inward to achieve the unlocked state immediately when torque is input to the input members 2, 102 z. Therefore, in order to manufacture the reverse input disconnect clutch, it is necessary to adjust the size of the gap G, Gz to an appropriate size in consideration of the above-described situation.

In the structure of the comparative example, in order to adjust the size of the gap Gz, it is sometimes necessary to finish the portion of the input-side engaged portion 113 that is in contact with the radially inner surface of the input-side engaging portion 107z by cutting with high accuracy. In contrast, in the structure of this example, the size of the gap G can be adjusted by simply managing the distance between the centers of the first hole 53 and the second hole 55 of the link member 31, and the link member 31 is manufactured by inexpensive press working, so that cost can be easily suppressed.

[ second example ]

A second example of the embodiment of the present invention will be described with reference to fig. 21. This example is a modification of the first example. In this example, the pair of biasing members 62 are disposed at positions offset from the output-side engaging portion 11 in the width direction of the engaging piece main body 30 corresponding to the second direction, that is, between the two width-direction side portions of the inner surfaces in the radial direction of the pair of engaging piece main bodies 30. The pair of biasing members 62 are elastically supported (elastically sandwiched) between the pair of engaging pieces 5, and elastically bias each of the pair of engaging pieces 5 in a direction toward the radially outer side, that is, in a direction approaching the pressed surface 20. Thus, in the neutral state in which no torque is applied to the input member 2 and the output member 3, the pressing surfaces 32 of the pair of engaging pieces 5 are in contact with the pressed surface 20.

The urging member 62 is constituted by a coil spring. The urging member 62 has a projection 63 inserted into the radially inner surface of the intermediate plate 41 constituting the engaging piece body 30 on the inner side of both axial side portions. This prevents the biasing member 62 from coming off between the radially inner surfaces of the pair of engaging piece bodies 30.

In this example, after torque is reversely input to the output member 3, the locked state can be more reliably achieved. As the elastic member 56, a member having a low elastic modulus can be used. Therefore, when torque is reversely input to the output member 3, the magnitude of torque required for directly engaging the output side engaging portion 11 with the output side engaged portion 34 can be reduced. Other structures and effects are the same as those of the first example.

[ third example ]

A third example of the embodiment of the present invention will be described with reference to fig. 22. The reverse input disconnect clutch 1a of the present example is different from the structures of the first and second examples, and each of the pair of engaging pieces 5a is not formed of a plurality of members but formed of a single member, as in the conventional structure described above.

Each of the engaging pieces 5a of the pair of engaging pieces 5a has a substantially semicircular plate shape, and is disposed radially inward of the pressed surface 20 provided on the inner peripheral surface of the housing 4a with the radially outer side surface facing the opposite side and the radially inner side surface facing each other. The engaging piece 5a has a pressing surface 32a, which is a partially cylindrical convex surface, on the outer surface in the radial direction. The engaging piece 5a has an output-side engaged portion 34a at a widthwise central portion of the radially inner side surface. The output-side engaged portion 34a is formed of a substantially rectangular recess that is recessed radially outward from a widthwise central portion of a radially inner surface (a side surface on a side farther from the pressed surface 20) of the engaging piece 5 a. In this example, the output-side engaged portion 34a has an inner surface shape slightly larger than an outer surface shape of a front half portion in the short axis direction of the output-side engaging portion 11a provided in the output member 3 a. The engaging piece 5a has an input-side engaged portion 64 formed of a hole penetrating in the axial direction at a radially intermediate portion. The input-side engaged portion 64 has a size that allows the input-side engaging portion 8a provided in the input member 2a to be loosely inserted. However, the input-side engaged portion may be formed of a recess (notch) formed in a circumferential central portion of a radially outer surface of the engaging piece so as to be recessed radially inward.

In this example, the elastic member 56a formed of a plate spring is disposed at a position overlapping the output-side engaging portion 11a of the output member 3a in a radial direction of the engaging piece 5a corresponding to the first direction, and the elastic member 56a is elastically supported (elastically deformed) between the engaging piece 5a and the output-side engaging portion 11 a.

The elastic member 56a is not fixed to either the output member 3a or the engaging piece 5a, but is elastically sandwiched between the output-side engaging portion 11a and the engaging piece 5 a. The elastic member 56a includes a pair of support plate portions 59a, a pressing plate portion 60a, and a pair of connecting plate portions 61 a. The elastic member 56a is provided so as to extend along the radially inner surface of the engaging piece 5 a. Specifically, the pair of support plate portions 59a are in surface contact with flat bottom surfaces 66 provided on both widthwise side portions of the radially inner side surface of the engaging piece 5a, and the pressing plate portion 60a and the pair of connecting plate portions 61a are disposed inside the output-side engaged portion 34 a. Therefore, in this example, the entire elastic member 56a is exposed from the engaging piece 5a when viewed in the axial direction.

In a neutral state in which the elastic member 56a is disposed between the output-side engaging portion 11a and the engaging piece 5a and no torque is applied to the input member 2a and the output member 3a, the pressing plate portion 60a is in surface contact with the output-side engaging portion 11a and slightly deforms radially outward. Therefore, the elastic member 56a is elastically supported (elastically deformed) between the output-side engaging portion 11a and the engaging piece 5 a. Thereby, the pair of support plate portions 59a elastically press both width-direction side portions of the radial inner side surface of the engaging piece 5a toward the radial outer side, and the pressing plate portion 60a elastically presses the output-side engaging portion 11a toward the radial inner side, respectively.

In this example, when torque is input to the input member 2a and when torque is input in the reverse direction to the output member 3a, the elastic members 56a of the pair of elastic members 56a are elastically deformed so as to displace all or a part of the pressing plate portion 60a radially outward, and the output-side engaging portion 11a and the output-side engaged portion 34a are engaged with each other via the pressing plate portion 60 a. That is, the pressing plate portion 60a is compressed and sandwiched between the output-side engaging portion 11a and the output-side engaged portion 34 a.

In this example, the output-side engaging portion 11a can be elastically sandwiched from both sides in the radial direction by the pair of elastic members 56 a. Therefore, regardless of the gap existing between the output-side engaging portion 11a and the output-side engaged portion 34a, the output-side engaging portion 11a can be prevented from rotating with a light force, and rattling of the output member 3a can be suppressed. Other structures and effects are the same as those of the first example and the conventional structure.

[ fourth example ]

A fourth example of the embodiment of the present invention will be described with reference to fig. 23. This example is a modification of the third example. In this example, a housing groove 65 is provided in an axially intermediate portion of the radially inner surface of the engaging piece 5a, and the housing groove 65 extends in the width direction so as to straddle the output-side engaged portion 34a when viewed in the axial direction. Most of the elastic member 56a except the pressing plate portion 60a is disposed inside the housing recess 65.

In a neutral state in which the elastic member 56a is disposed between the output-side engaging portion 11a and the engaging piece 5a and no torque is applied to the input member 2a and the output member 3a, only the pressing plate portion 60a constituting the elastic member 56a is exposed from the engaging piece 5a between the output-side engaging portion 11a and the output-side engaged portion 34 a. On the other hand, when a torque is input to the input member 2a and when a torque is reversely input to the output member 3a, the elastic members 56a of the pair of elastic members 56a are elastically deformed so as to displace all or a part of the pressing plate portion 60a radially outward. Further, all or a part of the pressing plate portion 60a is also moved to the inside of the housing recess 65. This allows the output-side engaging portion 11a to be directly engaged (contacted) with the output-side engaged portion 34a without passing through the pressing plate portion 60 a.

In this example, since most of the elastic member 56a can be disposed inside the engaging piece 5a, the reverse input/disconnection clutch 1a can be further downsized compared to the structure of the third example. Further, by the engagement of the elastic member 56a with the engaging piece 5a, the displacement of the elastic member 56a in the axial direction of the pressed surface 20 and in the width direction of the engaging piece 5a can be regulated. The other structures and effects are the same as those of the first and third examples.

In carrying out the present invention, the structures of the respective examples of the above-described embodiments can be appropriately combined and implemented within a range that does not contradict each other.

In the case of carrying out the present invention, the structure and shape of the elastic member are not limited to those described in the respective examples of the embodiment, and can be appropriately changed as long as the elastic member can exhibit the function of elastically supporting (elastically deforming) between the output-side engagement portion and the engagement piece.

In the structure of each example of the above-described embodiments, the input-side engaging portion, the engaging piece, and the elastic member of the input member are configured by a pair of input-side engaging portions, a pair of engaging pieces, and a pair of elastic members arranged so as to sandwich the output-side engaging portion from both sides in the radial direction. That is, the number of the input-side engaging portions, the engaging pieces, and the elastic members is two. However, in the case of implementing the present invention, the number of the input-side engaging portions, the engaging pieces, and the elastic members is not limited to two, and for example, one of the two input-side engaging portions, the two engaging pieces, and the two elastic members constituting the pair of input-side engaging portions, the pair of engaging pieces, and the pair of elastic members may be omitted, and each of the two input-side engaging portions, the two engaging pieces, and the two elastic members may be constituted by one input-side engaging portion, one engaging piece, and one elastic member. Alternatively, three or more input-side engaging portions, engaging pieces, and elastic members may be combined.

Description of the symbols

1. 1 a-a reverse input cutoff clutch, 2 a-an input member, 3 a-an output member, 4 a-a housing, 5 a-an engaging member, 6-an input shaft portion, 7-an input arm portion, 8 a-an input side engaging portion, 9-a support hole, 10-an output shaft portion, 11 a-an output side engaging portion, 12-a side surface, 13-a guide surface, 14-an output side housing element, 15-an input side housing element, 16-a bolt, 17-an outer diameter side cylindrical portion, 18-an inner diameter side cylindrical portion, 19-a side plate portion, 20-a pressed surface, 21-an output side recess engaging surface, 22-a threaded hole, 23-an output side bearing engaging surface, 24-an outer diameter side cylindrical portion, 25-an inner diameter side cylindrical portion, 26-a side plate portion, 27-an input side recess engaging surface, 28-a through hole, 29-an input side bearing surface, 30-an engaging member body, 31-a connecting rod member, 32. 32 a-a pressing surface, 33-a swing support shaft, 34 a-an output side engaged portion, 35-an internal space, 36-a bottom surface, 37-a guided surface, 38-an insertion hole, 39-a housing concave portion, 40-a main body plate, 41-an intermediate plate, 42-a bolt, 43-a nut, 44-a convex surface, 45-a support hole, 46-a concave portion, 47-a through hole, 48-a through hole, 49-a positioning hole, 50-a through hole, 51-a positioning hole, 52-a first end portion, 53-a first hole, 54-a second end portion, 55-a second hole (an input side engaged portion), 56-an elastic member, 57-an input side bearing, 58-an output side bearing, 59 a-a support plate portion, 60a pressing plate portion, 61 a-a connecting plate portion, 62-an urging member, 63-a convex portion, 64-an input side engaged portion, 65-a housing groove, 66-a bottom surface, 101-a reverse input cutoff clutch, 102. 102z — an input member, 103-an output member, 104-a pressed member, 105-an engaging member, 106-an input shaft portion, 107 z-an input side engaging portion, 108-an output shaft portion, 109-an output side engaging portion, 110-a pressed surface, 111-a pressed surface, 112-a bottom surface, 113-an input side engaged portion, 114-an output side engaged portion.