WO2021090857A1

WO2021090857A1 - Brake device

Info

Publication number: WO2021090857A1
Application number: PCT/JP2020/041280
Authority: WO
Inventors: 香取孝宜
Original assignee: テイ・エステック株式会社
Priority date: 2019-11-08
Filing date: 2020-11-05
Publication date: 2021-05-14

Abstract

In a brake device (1), each of a plurality of brake shoes (20) disposed on the radially inner side of an outer wheel (11) includes a first projecting portion (25A) and a second projecting portion (25B). Pairs of movable pieces (first rollers 81) are disposed between the first projecting portions (25A) and the second projecting portions (25B). An input side rotating member (40) includes, for each brake shoe (20), a first engaging portion (42A) disposed between the pair of movable pieces and the first projecting portion (25A), and a second engaging portion (42B) disposed between the pair of movable pieces and the second projecting portion (25B). When the input side rotating member (40) rotates in a first direction of rotation, the second engaging portions (42B) push the second projecting portions (25B), causing the brake shoes (20) to rotate in the first direction of rotation. When the input side rotating member (40) rotates in a second direction of rotation, the first engaging portions (42A) push the first projecting portions (25A), causing the brake shoes (20) to rotate in the second direction of rotation.

Description

Brake device

This disclosure relates to a braking device used for a height adjusting mechanism of a vehicle seat or the like.

In the height adjustment mechanism of the vehicle seat, the output shaft rotates by operating the lever that swings up and down provided on the input side, but the force that the seat tries to lower is applied to the output shaft due to the weight of the seat and the occupant. However, a braking device configured so that the output shaft does not rotate is used.

Generally, the brake device includes an outer ring and an output side rotating member (output shaft) arranged inside the outer ring, and when a rotational torque is input to the output side rotating member from the outside, the output side rotating member directly or The braking force is generated by pressing the brake shoe against the outer ring via the movable piece. For example, the brake device disclosed in

Patent Documents

1 and 2 includes an input-side rotating member, and the input-side rotating member has a protrusion that projects axially toward the brake shoe in order to rotate the brake shoe. There is. The protrusions of the input-side rotating member are provided so as to enter between adjacent brake shoes or to be adjacent to a portion of the brake shoes that protrudes outward in the radial direction.

Further, in the brake device disclosed in

Patent Documents

2 and 3, the movement of the output side rotating member is restricted in the axial direction only in the vicinity of one of the two bearings in the housing.

Japanese Unexamined Patent Publication No. 2013-253661 Japanese Unexamined Patent Publication No. 2016-124526 Special Table 2002-511305

Since the brake device is mounted on a vehicle such as a vehicle, it is required to be smaller and lighter. Further, if the axial position of the output side rotating member is regulated at only one place, vibration of the vehicle may be applied for a long period of time, and durability is required.

In view of the above background, it is desired to provide a brake device capable of miniaturization and weight reduction, and a brake device capable of ensuring high durability.
Further, it is desired that the output side rotating member is pivotally supported at an accurate position with respect to the housing. Further, it is desired that the brake device is operated stably, the rigidity of the brake device is increased, and the brake device can be easily manufactured.

In one aspect, we propose a brake device including an outer ring, a brake shoe, an output side rotating member, an input side rotating member, a pair of movable pieces, and a first spring. The outer ring has a cylindrical inner peripheral surface. A plurality of brake shoes are arranged side by side in the radial direction of the outer ring, and have a pair of brake surfaces facing the inner peripheral surface and contacting the inner peripheral surface, and an inner surface facing the inner peripheral surface in the radial direction. The output side rotating member is arranged inside each brake shoe in the radial direction. The output-side rotating member has an acting portion having a facing surface facing the inner side surface. The input-side rotating member can contact the brake shoe or the output-side rotating member to rotate the output-side rotating member. The movable piece is arranged between each of the inner side surfaces and the facing surface, and is sandwiched between the inner side surface and the facing surface to generate a braking force of the brake shoe. The first spring is arranged between the pair of movable pieces and urges the pair of movable pieces so as to separate them from each other.
Each of the brake shoes has a first protruding portion arranged at one end in the circumferential direction and protruding inward in the radial direction, and a second protruding portion arranged at the other end in the circumferential direction and protruding inward in the radial direction. It has a protrusion.
The pair of movable pieces are arranged between the first protrusion and the second protrusion.
The input-side rotating member includes a first engaging portion arranged between the pair of movable pieces and the first protruding portion that protrudes in the axial direction of the output-side rotating member, and a pair of movable pieces that protrude in the axial direction. A second engaging portion arranged between the second protruding portions is provided corresponding to each brake shoe.
When the input side rotating member rotates in the first rotation direction, the second engaging portion pushes the second protruding portion to rotate the brake shoe in the first rotation direction. On the other hand, when the input-side rotating member rotates in the second rotation direction opposite to the first rotation direction, the first engaging portion pushes the first protruding portion to rotate the brake shoe in the second rotation direction.

According to such a configuration, the first engaging portion of the input side rotating member is arranged between the first protruding portion of the brake shoe protruding inward in the radial direction and the pair of movable pieces, and the brake shoe has a first engaging portion. By arranging the second engaging portion of the input side rotating member between the second protruding portion protruding inward in the radial direction and the pair of movable pieces, the diameter of the input side rotating member can be reduced. Further, the brake shoe has a recess provided on the inner side surface by having a first protrusion and a second protrusion, and the first engagement portion and the second engagement portion are arranged in the space of the recess. Therefore, the space between the outer ring and the output side rotating member can be effectively used. As a result, the brake shoes can be made smaller and lighter.

In the brake device described above, when the input-side rotating member rotates in the first rotation direction, the first engaging portion pushes one of the pair of movable pieces to release the braking force, and the input-side rotating member makes a second rotation. When rotating in the direction, the second engaging portion may be configured to push the other of the pair of movable pieces to release the braking force.

According to such a configuration, the first engaging portion and the second engaging portion not only have a function of pushing the brake shoe in the rotational direction to rotate the brake shoe, but also push the movable piece in the rotational direction to release the braking force. It also has the function of That is, since the first engaging portion and the second engaging portion have two functions, the brake device can be made smaller and lighter.

The input-side rotating member can have a contact convex portion that faces the facing surface, projects inward in the radial direction, and can come into contact with the working portion.
In this case, it is desirable that the first engaging portion, the second engaging portion, and the contact convex portion are arranged on one circumference centered on the rotation axis of the output side rotating member.

In this way, by arranging the first engaging portion, the second engaging portion, and the contact convex portion on one circumference centered on the rotation axis of the output side rotating member, the outer ring and the output side rotating member can be formed. The space between them can be effectively used to reduce the size and weight of the braking device.

The first engaging portion, the second engaging portion, and the contact convex portion may be arranged along the inner circumference of the input side rotating member.

The input side rotating member may have a groove between the first engaging portion and the contact convex portion and between the second engaging portion and the contact convex portion.

By providing the groove in this way, the weight of the input side rotating member can be reduced and the weight of the brake device can be reduced.

The size of the first engaging portion and the second engaging portion in the circumferential direction may be smaller than the size of the contact convex portion in the circumferential direction.

It is desirable that the working portion is arranged so as to intersect the straight line connecting the tip of the first protruding portion and the tip of the second protruding portion of each brake shoe.

When the working portion is formed in this way, the working portion is arranged in the recess between the first protruding portion and the second protruding portion of the brake shoe. That is, the brake device can be made smaller and lighter by effectively utilizing the space between the first protruding portion and the second protruding portion.

It is desirable that the output-side rotating member has a recess on the rotation axis that accommodates a screw for attaching a lever for rotating the input-side rotating member.

According to such a configuration, the weight of the output side rotating member can be reduced and the weight of the brake device can be reduced.

The brake device described above may further include an operating member for rotating the input-side rotating member and a lever that rotates integrally with the operating member.
The operating member may have an axially projecting portion that projects in the axial direction of the output-side rotating member in a part of the outer peripheral portion, and the lever may have a notch that engages with the axially projecting portion.

Further, the following configuration will be disclosed focusing on the output side rotating member of the brake device including the input side rotating member and the output side rotating member. The output-side rotating member has an output gear, and does not rotate when a torque for rotating the output-side rotating member is input from the output gear, and does not rotate when a torque for rotating the input-side rotating member is input. Rotate. The output-side rotating member has a recess on the rotation axis that accommodates a screw for attaching a lever for rotating the input-side rotating member.

According to such a configuration, the weight of the output side rotating member can be reduced and the weight of the brake device can be reduced.
Disclosed is an aspect of a brake device including an outer ring, a brake shoe, an output side rotating member, an input side rotating member, and a housing. The outer ring has a cylindrical inner peripheral surface. A plurality of brake shoes are arranged side by side in the radial direction of the outer ring, and have a pair of brake surfaces facing the inner peripheral surface and contacting the inner peripheral surface, and an inner surface facing the inner peripheral surface in the radial direction. The output side rotating member is arranged inside each brake shoe in the radial direction. The output-side rotating member has an action portion having a facing surface facing the inner surface, and when a torque for rotating the output-side rotating member is input from the outside, the facing surface directly or indirectly faces the inner surface. By pushing, the brake shoe is pressed against the inner peripheral surface. The input-side rotating member can contact the brake shoe or the output-side rotating member to rotate the output-side rotating member. The housing houses the brake shoes, the working part and the input side rotating member.
The housing is a first bearing portion that pivotally supports the output-side rotating member and a second bearing portion that is located away from the first bearing portion in the axial direction of the output-side rotating member, and supports the output-side rotating member. It has a second bearing portion and a second bearing portion.
The first bearing portion abuts on the output side rotating member in the axial direction to regulate the movement of the output side rotating member to one side in the axial direction.
The second bearing portion abuts on the output side rotating member in the axial direction to regulate the movement of the output side rotating member to the other side in the axial direction.

According to such a configuration, the first bearing portion of the housing restricts the movement of the output side rotating member to one side in the axial direction, and the second bearing portion restricts the movement of the output side rotating member to the other side in the axial direction. Regulate movement. Therefore, the durability of the brake device can be increased.

The housing has an outer ring, a side wall portion extending radially inward from the outer ring and restricting the movement of the brake shoe to one side in the axial direction, and an outer ring portion integrally having a first bearing portion formed on the side wall portion. A first cover member having a member, an outer ring fitting portion that fits on the outer peripheral surface of the outer ring, and a first cover portion that regulates the movement of the brake shoe to the other side in the axial direction, and a first cover portion. It may be configured to include a second cover member which is fixed to and has a second bearing portion.

According to such a configuration, the first cover portion that regulates the movement of the brake shoe to the other side in the axial direction is the second cover member that regulates the movement of the output side rotating member to the other side in the axial direction. Since it is provided separately from the (second bearing portion), the durability of the braking device can be further increased.

The inner peripheral surface of the outer ring fitting portion may be welded to the outer peripheral surface of the outer ring.

According to such a configuration, these are fixed on the surface where the outer ring and the outer ring fitting portion are fitted, which has a wide contact surface. Therefore, the first cover member is firmly fixed to the outer ring member to be a brake device. The rigidity of the can be increased.

The second cover member has a cover fitting portion that fits on the outer peripheral surface of the outer ring fitting portion, and the inner peripheral surface of the cover fitting portion may be welded to the outer peripheral surface of the outer ring fitting portion.

According to such a configuration, since the contact surface is wide and the outer ring fitting portion and the cover fitting portion are fixed on the mating surface, the second cover member is firmly fixed to the first cover member. , The rigidity of the braking device can be increased. Further, the outer ring fitting portion is fitted to the outer peripheral surface of the outer ring, and the cover fitting portion is further fitted to the outer ring fitting portion, so that the first bearing portion of the outer ring member and the second cover member have the second cover fitting portion. The axis of the bearing can be aligned accurately. That is, the output-side rotating member can be pivotally supported at an accurate position with respect to the housing.

The first cover member may further have a mounting flange extending radially outward from the outer ring fitting portion for mounting the brake device on another member.

The brake device described above is a pair of first movable pieces arranged between each of the inner side surfaces and the facing surface, and is sandwiched between the inner side surface and the facing surface to reduce the braking force of the brake shoe. It may further include a first movable piece to be generated and a first spring which is arranged between the pair of first movable pieces and urges the pair of first movable pieces to separate from each other.
In this case, each of the brake shoes is arranged at one end in the circumferential direction and protrudes inward in the radial direction, and is arranged at the other end in the circumferential direction and protrudes inward in the radial direction. A pair of first movable pieces are arranged between the first protruding portion and the second protruding portion, and the input side rotating member protrudes in the axial direction. A first engaging portion arranged between the piece and the first protruding portion, and a second engaging portion arranged between the pair of first movable pieces and the second protruding portion protruding in the axial direction, It is good to have it corresponding to each brake shoe. Then, when the input-side rotating member rotates in the first rotation direction, the first engaging portion pushes one of the pair of first movable pieces to release the braking force, and the second engaging portion protrudes second. When the brake shoe is rotated in the first rotation direction by pushing the portion and the input side rotating member rotates in the second rotation direction opposite to the first rotation direction, the second engaging portion is a pair of first movable pieces. It is desirable that the other of the brakes is pushed to release the braking force and the first engaging portion pushes the first protruding portion to rotate the brake shoe in the second rotation direction.

According to such a configuration, the first engaging portion and the second engaging portion can have both a function of rotating the brake shoe and a function of releasing the braking force by pushing the first movable piece. it can. As a result, the size of the brake device can be reduced.

The brake device described above is a second movable piece arranged between an operation ring arranged radially outside the input side rotating member and an inner peripheral surface of the operation ring and an outer peripheral surface of the input side rotating member. , A plurality of second movable pieces that are sandwiched between the inner peripheral surface of the operation ring and the outer peripheral surface of the input side rotating member to make the input side rotating member follow the rotating operation of the operation ring, and the adjacent second movable piece. (2) A second spring that urges the movable pieces so as to keep them away from each other can be further provided.
In this case, the first cover portion regulates the movement of the second movable piece to one side in the axial direction, and the second cover member regulates the movement of the second movable piece to the other side in the axial direction. It can have a second cover portion.

According to such a configuration, the first cover portion that regulates the movement of the second movable piece to one side in the axial direction is a side wall that regulates the movement of the output side rotating member to one side in the axial direction. Since it is provided separately from the part, the durability of the braking device can be further improved.

The second movable piece is a roller or a sphere, the first cover member projects axially and has a regulating protrusion arranged between the plurality of second movable pieces, and the regulating protrusion is a regulating protrusion of the second movable piece. It is desirable that the output side rotating member comes into contact with the second movable piece at a position smaller than the center from the rotation axis.

According to such a configuration, when the second movable piece is urged by the second spring, it hits the regulating protrusion and is urged outward in the radial direction, so that the position of the second movable piece is positioned. Stabilize. As a result, the brake device can be operated stably.

The first cover portion may be configured to regulate the movement of the second spring to one side in the axial direction.

The brake device may further include an operating member arranged on the other side in the axial direction with respect to the second cover member.
In this case, the operation ring has an operation protrusion that protrudes outward in the radial direction, and the operation member has a notch that engages with the operation protrusion, and the notch engages with the operation protrusion. The operation member and the operation ring may be configured to rotate integrally.

According to such a configuration, it is possible to easily manufacture a structure for integrally rotating the operation member and the operation ring.

It is a side view of the vehicle seat to which the brake device which concerns on 1st Embodiment is applied. It is an exploded perspective view of the brake device which concerns on 1st Embodiment. It is a cross-sectional view of a brake part. FIG. 3 is a sectional view taken along line IV-IV of FIG. FIG. 3 is a sectional view taken along line VV of FIG. It is a perspective view which looked at the brake device from the input side. It is the figure which looked at the input side rotating member from the input side along the axial direction. It is a cross-sectional view of a ratchet part. It is the figure which looked at the brake device from the input side along the axial direction. It is a figure explaining the operation of a ratchet part, and shows the case where the operation ring is rotated clockwise from a neutral position. It is a figure explaining the operation of the ratchet part, and shows the case where the operation ring is returned counterclockwise from the state of FIG. It is a figure explaining the operation of the brake part, and shows the case where the rotation torque of a counterclockwise direction is applied to the output side rotating member. It is a figure explaining the operation of the brake part, and shows the case where the input side rotating member is rotated clockwise from the state of FIG. It is a figure explaining the operation of the brake part, and shows the case where the input side rotating member is rotated counterclockwise from the state of FIG. It is a side view of the vehicle seat to which the brake device which concerns on 2nd Embodiment is applied. It is an exploded perspective view of the brake device which concerns on 2nd Embodiment. It is a cross-sectional view of a brake part. FIG. 17 is a cross-sectional view taken along line XX of FIG. It is a perspective view which looked at the brake device from the input side. It is the figure which looked at the input side rotating member from the output side along the axial direction. It is a cross-sectional view of a ratchet part. It is a figure explaining the state of the return spring when the operating member is rotated clockwise. It is a figure explaining the operation of a ratchet part, and shows the state which the operation ring was rotated clockwise from a neutral position. It is a figure explaining the operation of the ratchet part, and shows the state which returned the operation ring counterclockwise from the state of FIG. It is a figure explaining the operation of the brake part, and shows the state which applied the counterclockwise rotation torque to the output side rotating member. It is a figure explaining the operation of the brake part, and shows the state which the input side rotating member is rotated clockwise from the state of FIG. It is a figure explaining the operation of the brake part, and shows the state which the input side rotating member is rotated counterclockwise from the state of FIG.

Next, the brake device 1 according to the first embodiment will be described in detail with reference to the drawings as appropriate.
As shown in FIG. 1, the brake device 1 is applied to a height adjusting mechanism for adjusting the height of the seat cushion S1 of the vehicle seat S as an example of the vehicle seat. In the brake device 1, the lever 75 is attached to the operating member 110 of the brake device 1. Then, by operating the lever 75, the height of the seat cushion S1 can be adjusted by rotating the output side rotating member 30, which will be described later, to drive the height adjustment mechanism. Specifically, when the lever 75 is raised from the neutral position N, the seat cushion S1 is raised by a predetermined amount, and when the lever 75 is lowered from the neutral position N, the seat cushion S1 is lowered by a predetermined amount. When the lever 75 is returned from the upper or lower position to the neutral position N, the output side rotating member 30 does not rotate.

As shown in FIG. 2, the brake device 1 is configured such that each member is housed in a housing 100. The housing 100 is composed of a combination of the outer ring member 10 and the cover member 60. Further, in the following description, the left side of FIG. 2 in which the operating member 110 is arranged is referred to as an “input side”, and the right side of FIG. 2 in which the output gear 35 of the output side rotating member 30 is arranged is referred to as an “output side”. ..

The brake device 1 is provided on the input side and is provided on the ratchet portion 2 for transmitting and shutting off the input torque due to the rotational operation of the operating member 110, and on the output side, the input torque from the ratchet portion 2 is transmitted to the output side rotating member 30. It is provided with a brake unit 3 that transmits the torque to the output gear 35 and cuts off the reverse input torque from the output gear 35.

Explaining the outline of the components of the ratchet part 2 and the brake part 3, the ratchet part 2 includes an operation member 110, an operation ring 150, a second roller 82 as a second movable piece, a second spring 87, and a return. It includes a spring 85, an input side rotating member 40, and a regulating member 71. Further, the brake unit 3 includes an outer ring member 10, a brake shoe 20, an output side rotating member 30, an input side rotating member 40, a first roller 81, a first spring 86, and a friction member 90. Become. The input-side rotating member 40 is an output member of the ratchet section 2 and an input member of the brake section 3, and can be said to be any component of the ratchet section 2 and the brake section 3.

Next, the details of the configuration of the brake portion 3 and the ratchet portion 2 will be described.
First, the configuration of the brake unit 3 will be described.
The outer ring member 10 includes an outer ring 11, a side wall portion 12, and a first bearing portion 13.
The outer ring 11 is made of a ring having a predetermined thickness, and has a cylindrical inner peripheral surface 14, a cylindrical outer peripheral surface 15, and a side surface 16 connecting the inner peripheral surface 14 and the outer peripheral surface 15 on the input side. ..
The side wall portion 12 extends radially inward from the output side end portion of the outer ring 11. The side wall portion 12 regulates the movement of the brake shoe 20 to one side (output side) in the axial direction of the output side rotating member 30. In this specification, the axial direction of the output side rotating member 30 is simply referred to as "axial direction".
A circular shaft support hole 12A coaxial with the inner peripheral surface 14 is formed in the side wall portion 12. The first bearing portion 13 is a circular flange extending from the edge of the shaft support hole 12A to the output side. The first bearing portion 13 pivotally supports the output side rotating member 30. That is, in the outer ring member 10, the first bearing portion 13 is integrally formed with the side wall portion 12.

A plurality of holes 12H are provided in the side wall portion 12. The plurality of holes 12H support the brake shoe 20 from below when the outer ring member 10 is placed with the output side facing down and the brake shoe 20 is placed in the outer ring 11 when the brake device 1 is assembled. It is a hole for passing a pin as a tool. By supporting the brake shoe 20 with such a pin, the brake shoe 20 is arranged at a predetermined height (position in the axial direction) regardless of the accuracy of the side wall portion 12, and the first roller 81 or the like is used. Parts can be assembled.

The outer ring member 10 can be formed by forging or press molding. When the first bearing portion 13 is formed by burring by forging or press forming, the inner peripheral surface 14 of the outer ring 11 is formed with the same mold as the mold for forming the inner peripheral surface of the first bearing portion 13, or the inner peripheral surface 14 is formed. By using a mold that fits with the peripheral surface 14, the center of the inner peripheral surface 14 and the center of the first bearing portion 13 can be accurately aligned.

The brake shoes 20 are members that generate a braking force with the outer ring 11, and three brake shoes 20 are arranged inside the outer ring 11 in the radial direction so as to be arranged at equal intervals in the circumferential direction. The brake shoe 20 has a main body portion 20A extending in the circumferential direction, an outer protruding portion 20B and a central protrusion 20C protruding radially outward on the outer circumference of the main body portion 20A, and a diameter at each end portion in the circumferential direction of the inner circumference of the main body portion 20A. It is configured to have a first protruding portion 25A and a second protruding portion 25B protruding inward in the direction. In this specification, the radial direction and the circumferential direction are based on the inner peripheral surface 14 of the outer ring 11.

One outer protrusion 20B is provided on each brake shoe 20 at both ends in the circumferential direction of the outer circumference of the main body 20A, that is, a pair. Each outer protrusion 20B has a brake surface 21 at the tip on the outer side in the radial direction, which faces the inner peripheral surface 14 of the outer ring 11 and can come into contact with the inner peripheral surface 14. The brake surface 21 has substantially the same curvature as the inner peripheral surface 14 of the outer ring 11, and as shown in FIG. 3, the outer side of the brake surface 21 in the circumferential direction (the outer side in the circumferential direction with respect to each brake shoe 20). Is arranged so as to come into contact with the inner peripheral surface 14 of the outer ring 11. As a result, when the brake shoe 20 is urged outward in the radial direction, the peripheral end region of the brake surface 21 in the circumferential direction is pressed against the inner peripheral surface 14 of the outer ring 11.

As shown in FIG. 2, the central protrusion 20C is provided at the central portion in the circumferential direction of the outer periphery of the main body portion 20A. A support surface 26 capable of contacting the inner peripheral surface 14 of the outer ring 11 is provided at the radial outer tip of the central protrusion 20C. In other words, the support surface 26 is provided at the center between the pair of brake surfaces 21. The support surface 26 has substantially the same curvature as the inner peripheral surface 14 of the outer ring 11, and has a cylindrical surface shape along the inner peripheral surface 14 of the outer ring 11. The support surface 26 is separated from the inner peripheral surface 14 of the outer ring 11 in a state where the brake shoe 20 and the output side rotating member 30 are not loaded.

The brake shoe 20 has a cylindrical outer peripheral surface having a diameter smaller than that of the brake surface 21 between one of the pair of brake surfaces 21 and the support surface 26 and between the other of the pair of brake surfaces 21 and the support surface 26. Has 22. Further, the brake shoe 20 has an inner side surface 23 facing inward in the radial direction between the first protruding portion 25A and the second protruding portion 25B.

As shown in FIG. 3, each of the inner side surfaces 23 has a first contact surface 23A that inclines toward the facing surface 36 (lower side in the figure) of the output side rotating member 30 as it goes outward in the circumferential direction. doing. The first contact surface 23A is in contact with the first roller 81.

The first protruding portion 25A is arranged at one end of the inner side surface 23 in the circumferential direction (in the present embodiment, the end in the counterclockwise direction when viewed from the input side to the output side) and is directed inward in the radial direction. It is protruding.
The second protruding portion 25B is arranged at the other end of the inner side surface 23 in the circumferential direction and protrudes inward in the radial direction.

The output side rotating member 30 is arranged inside the brake shoe 20 in the radial direction. As shown in FIG. 2, the output side rotating member 30 includes a shaft-shaped working portion 31, a first shaft portion 32, an intermediate shaft portion 33A, a second shaft portion 33B, an output gear 35, and a recess 37. It is configured with.

As shown in FIG. 3, the acting portion 31 is a recess on the inner peripheral side of the brake shoe 20 at the tip of the first protruding portion 25A and the tip of the second protruding portion 25B of each brake shoe 20 (the portion closest to the rotation axis X1). It is arranged so as to intersect with the straight line L1 connecting the portions that are both ends of the above. In other words, the acting portion 31 is formed in the recess between the first protruding portion 25A and the second protruding portion 25B formed by the first protruding portion 25A and the second protruding portion 25B protruding from the inner surface 23 of the brake shoe 20. Is intruded.

As shown in FIG. 2, the first shaft portion 32 is arranged on the output side of the working portion 31.
The intermediate shaft portion 33A protrudes from the working portion 31 toward the input side and is coaxial with the first shaft portion 32.
The second shaft portion 33B protrudes from the intermediate shaft portion 33A to the input side and is coaxial with the first shaft portion 32. The second shaft portion 33B is slightly thinner than the intermediate shaft portion 33A.
The output gear 35 is arranged on the output side of the first shaft portion 32, and projects to the output side through the shaft support hole 12A of the side wall portion 12 (see FIG. 4).
The recess 37 is formed at the end of the output gear 35 on the input side. The recess 37 is arranged on the rotation axis X1 of the output side rotation member 30. As shown in FIG. 4, the recess 37 accommodates a part of the shaft portion 77A of the screw 77 for attaching the lever 75 for rotating the input side rotating member 40.

As shown in FIG. 3, the working portion 31 has an facing surface 36 facing the inner side surface 23 of the brake shoe 20 and a connecting surface 38 on the outer periphery thereof. Three facing surfaces 36 are provided on the outer periphery of the working portion 31 corresponding to the inner surface 23 of each brake shoe 20. A pair of first rollers 81 are arranged between each inner side surface 23 and each facing surface 36. Further, the connecting surface 38 is a portion that connects each of the facing surfaces 36 in the circumferential direction, and is provided between a pair of facing surfaces 36 adjacent to each other in the circumferential direction of the outer periphery of the working portion 31, for a total of three. There is. The connecting surface 38 is formed as a curved surface having an arc shape in cross section centered on the rotation axis X1 of the output side rotating member 30.

The facing surface 36 has a second contact surface 36A capable of contacting the first roller 81 at both ends on the outer side of the facing surface 36 in the circumferential direction. The second contact surface 36A is inclined so as to approach the inner side surface 23 as it goes outward in the circumferential direction.

A total of three pairs of first rollers 81 are arranged between the inner side surface 23 of each brake shoe 20 and the corresponding facing surfaces 36 of the output side rotating member 30. The pair of first rollers 81 is an example of a pair of movable pieces. The first roller 81 is arranged between the first protruding portion 25A and the second protruding portion 25B of the brake shoe 20 in the circumferential direction. Here, of the pair of first rollers 81 arranged between the inner side surfaces 23 and the corresponding facing surfaces 36, the one arranged on the counterclockwise side in FIG. 3 is referred to as the first roller 81A, and the clockwise side. The one arranged in is referred to as the first roller 81B. The first roller 81 is sandwiched between the inner side surface 23 and the facing surface 36 in a state where the brake shoe 20 and the output side rotating member 30 are not loaded.
When a torque for rotating the output side rotating member 30 is input from the outside, the facing surface 36 indirectly pushes the inner surface 23 of the brake shoe 20 via the first roller 81, and the brake shoe 20 is the brake surface. 21 is pressed against the inner peripheral surface 14 of the outer ring 11. The first roller 81 is sandwiched between the inner side surface 23 and the facing surface 36 to generate a braking force of the brake shoe 20.

The first spring 86 is a compression coil spring, and is provided one by one between the pair of

first rollers

81A and 81B. The first spring 86 urges the pair of

first rollers

81A and 81B so as to be separated from each other in the circumferential direction. As a result, the pair of

first rollers

81A and 81B are urged on the narrow side of the space formed between the inner side surface 23 and the facing surface 36.

When rotational torque is applied to the brake shoes 20 by the input side rotating member 40, the inner side surface 23 and the facing surface 36 push the facing surface 36 via the first roller 81 to rotate the output side rotating member 30. Even if a rotational torque is applied to the output side rotating member 30, the opposing surface 36 pushes the inner side surface 23 via the first roller 81 and the brake surface 21 is pressed against the inner peripheral surface 14 of the outer ring 11, so that the brake shoe 20 rotates. It is configured not to. That is, the inclination angle and the position of the second contact surface 36A with respect to the first contact surface 23A are adjusted so as to function as such.

As shown in FIG. 2, the input-side rotating member 40 is rotatable around the rotation axis X1. The input-side rotating member 40 is a member capable of outputting the rotation of the ratchet portion 2 and contacting the brake shoe 20 of the brake portion 3 in the circumferential direction to apply rotational torque to the brake shoe 20. The input side rotating member 40 includes a cylindrical pressure receiving ring portion 41, a side wall portion 43 extending radially inward from the output side end portion of the pressure receiving ring portion 41, a plurality of engaging portions 42, and a guide convex portion 44. It has a plurality of contact protrusions 46 and a plurality of grooves 48.

The pressure receiving ring portion 41 has an outer peripheral surface 41A and an inner peripheral surface 41B.
Both the outer peripheral surface 41A and the inner peripheral surface 41B are cylindrical surfaces having no unevenness.
The side wall portion 43 has a hole 43A. An engaging portion 42, a guide convex portion 44, a contact convex portion 46, and a groove 48 are provided along the inner circumference of the side wall portion 43 in the radial direction.
The engaging portion 42 projects from the inner peripheral edge of the side wall portion 43 toward the output side in the axial direction.

As shown in FIGS. 3 and 7, a total of 6 engaging portions 42 are provided, two for each brake shoe 20. The two engaging portions 42 corresponding to the brake shoes 20 are the first engaging portion 42A arranged between the first roller 81A and the first protruding portion 25A, and the first roller 81B and the second protruding portion 25B. It includes a second engaging portion 42B arranged between them. The size of the first engaging portion 42A and the second engaging portion 42B in the circumferential direction is smaller than the size of the contact convex portion 46 in the circumferential direction.

As shown in FIG. 7, the acting portion 31 of the output side rotating member 30 is arranged inside the hole 43A of the side wall portion 43. The radial inner surface of the engaging portion 42 has a cylindrical surface along the connecting surface 38, and by fitting with the connecting surface 38 of the working portion 31, the input side rotating member 40 becomes the output side rotating member. Alignment with the working portion 31 of 30 is made.

The first engaging portion 42A and the second engaging portion 42B have a function of releasing the braking force by the brake shoe 20 and rotating the brake shoe 20.
As shown in FIG. 13, when the input side rotating member 40 rotates in the first rotation direction (clockwise in FIG. 13), the first engaging portion 42A is one of a pair of movable pieces, and the first roller 81A To release the braking force, the second engaging portion 42B pushes the second protruding portion 25B to rotate the brake shoe 20 in the first rotation direction.
On the other hand, as shown in FIG. 14, when the input side rotating member 40 rotates in the second rotation direction (counterclockwise in FIG. 14) opposite to the first rotation direction, the second engaging portion 42B is paired. The first roller 81B, which is the other side of the movable piece, is pushed to release the braking force, and the first engaging portion 42A pushes the first protruding portion 25A to rotate the brake shoe 20 in the second rotation direction.

As shown in FIG. 7, the guide convex portion 44 is provided so as to project inward in the radial direction on the inner peripheral edge of the side wall portion 43. The guide convex portion 44 is arranged so as to face the connecting surface 38 of the acting portion 31. The guide convex portion 44 has a cylindrical surface along the connecting surface 38, and by fitting with the connecting surface 38, the input side rotating member 40 is aligned with the acting portion 31 of the output side rotating member 30. To.

The contact convex portion 46 faces the facing surface 36, projects inward in the radial direction, and can come into contact with the acting portion 31.
The contact convex portion 46 has a convex surface portion 47 projecting inward in the radial direction.

Each convex surface portion 47 faces the facing surface 36. Each convex surface portion 47 has a top portion 47A projecting inward in the most radial direction, a release surface 47B adjacent to the clockwise side of FIG. 7 with respect to the top portion 47A, and a flank surface 47C adjacent to the counterclockwise side of FIG. Has.

On the release surface 47B, the rotation torque in the counterclockwise direction of FIG. 7 due to the weight of the occupant sitting on the vehicle seat S is input to the output side rotation member 30, and the input side rotation member 40 is referred to as the rotation torque. It is abbreviated as the time when the second engaging portion 42B abuts on the second protruding portion 25B of the brake shoe 20 in the circumferential direction when rotated in the opposite rotation direction (clockwise direction in FIG. 7) (see FIG. 13). At the same time, it has a shape capable of transmitting rotational torque to the output side rotating member 30 by contacting the facing surface 36 (the portion of the release surface 47B close to the top 47A). That is, the input-side rotating member 40 can come into contact with the output-side rotating member 30 to rotate the output-side rotating member 30.

The flank 47C is when the input side rotating member 40 is rotated in the counterclockwise direction of FIG. 3 and the first engaging portion 42A comes into contact with the first protruding portion 25A of the brake shoe 20 in the circumferential direction (FIG. 14). (See), the shape is such that it does not abut on the facing surface 36. However, the flank 47C may have a shape that exerts the same function as the release surface 47B. In other words, a release surface may be provided corresponding to each rotation direction.

The groove 48 is formed between the first engaging portion 42A and the contact convex portion 46, between the second engaging portion 42B and the contact convex portion 46, between the first engaging portion 42A and the guide convex portion 44, and the second. It is provided between the engaging portion 42B and the guide convex portion 44, respectively.

The first engaging portion 42A, the second engaging portion 42B, the guide convex portion 44, the contact convex portion 46, and the groove 48 are arranged on one circumference C1 centered on the rotation axis X1 of the output side rotating member 30. ing. The first engaging portion 42A, the second engaging portion 42B, the guide convex portion 44, and the contact convex portion 46 are arranged in different phases on the same circumference C1 to reduce the size of the input side rotating member 40. Can be done.

As shown in FIG. 2, the friction member 90 is a member that generates an auxiliary braking force for suppressing the sudden start of operation of the output side rotating member 30 at the moment when the braking force of the braking portion 3 is cut off. .. The friction member 90 is arranged between the brake shoe 20 and the side wall portion 12 of the outer ring member 10. The friction member 90 has a plate-shaped main body portion 91 and three spacing holding portions 92 protruding from the main body portion 91 toward the input side.
The main body 91 has a fitting hole 93 at the center that matches the outer peripheral shape of the working portion 31. Further, the main body 91 has a plurality of friction protrusions 94 protruding outward in the radial direction on the outer periphery. Further, the main body 91 has a plurality of through holes 95 for weight reduction. Since the through hole 95 overlaps with the hole 12H of the outer ring member 10 when viewed from the axial direction (not shown), the phase of the friction member 90 can be determined by inserting the pin described above at the time of assembly.
When the fitting hole 93 is fitted with the acting portion 31, the friction member 90 rotates integrally with the output side rotating member 30.
The friction protrusion 94 has a dimension of pressure contact with the inner peripheral surface 14 of the outer ring 11, and when the friction protrusion 94 presses against the inner peripheral surface 14, appropriate friction between the friction protrusion 94 and the inner peripheral surface 14 Force is generated.

As shown in FIG. 3, the interval holding portion 92 is a portion arranged between the brake shoes 20 in the circumferential direction to hold the interval in the rotation direction of the brake shoes 20. A plurality of interval holding portions 92 are provided according to the number of brake shoes 20, and here, three are provided. Each interval holding portion 92 is arranged in a substantially triangular space surrounded by two brake shoes 20 adjacent to each other in the circumferential direction and a connecting surface 38 of the output side rotating member 30. That is, since the space holding portion 92 is arranged by effectively utilizing the space between the two brake shoes 20 and the output side rotating member 30, it is possible to suppress the increase in size of the brake portion 3.

The material constituting the friction member 90 is not particularly limited, but the friction member 90 is made of, for example, resin. If the friction member 90 is made of resin, a complicated shape can be easily made, and since noise is less likely to be generated when sliding with the inner peripheral surface 14, the noise during operation of the brake portion 3 should be quiet. Can be done.

Next, the configuration of the housing 100 will be described.
As shown in FIGS. 2 to 4, the housing 100 includes an outer ring member 10 and a cover member 60, and the housing 100 includes a brake shoe 20, an acting portion 31 of the output side rotating member 30, and input side rotation. It houses a member 40, an operation ring 150, a regulation member 71, a first roller 81, a second roller 82, a first spring 86, a second spring 87, and a friction member 90. As shown in FIG. 4, the housing 100 includes a first bearing portion 13 that pivotally supports the output side rotating member 30, and a second bearing portion 67 that is located away from the first bearing portion 13 in the axial direction. It has a second bearing portion 67 that pivotally supports the output side rotating member 30. The second bearing portion 67 is provided on the cover member 60.

The cover member 60 is made of a metal plate, and has a cover portion 61, a ratchet accommodating portion 62, a diameter-expanded portion 63, an outer ring fitting portion 64, a mounting flange 65, and a spring engaging portion 66.

The cover portion 61 is made of a plate having a circular contour. The cover portion 61 is arranged on the input side of the input side rotating member 40, the second roller 82, and the second spring 87 in the axial direction. As a result, the cover portion 61 regulates the input side rotating member 40, the second roller 82, and the second spring 87 from moving toward the input side in the axial direction.
The cover portion 61 has a circular through hole 61B into which the second shaft portion 33B of the output side rotating member 30 fits. The ring-shaped portion around the through hole 61B is the second bearing portion 67.

Further, the cover portion 61 has three arc holes 61D arranged at equal intervals in the circumferential direction and fitting holes 61C located radially outside the arc holes 61D and arranged at three equal intervals in the circumferential direction. And a funnel-shaped recess 61P formed around the through hole 61B.
The arc hole 61D is provided corresponding to the operation engaging portion 152 of the operation ring 150, and is formed in an arc shape longer in the circumferential direction than the operation engagement portion 152. As a result, the arc hole 61D accepts the operation engaging portion 152, and the operation engaging portion 152 can move in the arc hole 61D within a predetermined angle range.

The fitting holes 61C are three through holes provided corresponding to the three regulation portions 71B of the regulation member 71 (see also FIG. 2) so that the regulation member 71 does not rotate relative to the cover member 60. It is fitted with the cover member 60. The regulating portion 71B is press-fitted into the fitting hole 61C. By fitting the regulating member 71 and the cover member 60 at a plurality of locations, it is possible to firmly regulate the rotation of the regulating member 71.

The recess 61P is a funnel-shaped portion that is recessed on the output side in the axial direction. Since the recess 61P is recessed on the output side in the axial direction, the second bearing portion 67 is located on the output side by that amount, and the axial length of the output side rotating member 30 can be shortened. As a result, the weight of the output side rotating member 30 can be reduced.

The ratchet accommodating portion 62 is a cylindrical plate extending from the radial outer end of the cover portion 61 to the output side in the axial direction. The ratchet accommodating portion 62 accommodates the parts of the ratchet accommodating portion 2.

The diameter-expanded portion 63 is a ring-shaped plate extending radially outward from the output-side end of the ratchet accommodating portion 62.

The outer ring fitting portion 64 has a cylindrical shape extending from the radial outer end of the enlarged diameter portion 63 to the output side in the axial direction. As shown in FIG. 4, the outer ring fitting portion 64 fits on the outer peripheral surface 15 of the outer ring 11. Then, the inner peripheral surface 64G of the outer ring fitting portion 64 is welded to the outer peripheral surface 15 of the outer ring 11 by irradiating the laser beam of laser welding from the radial outside of the outer ring fitting portion 64 (FIG. 4). , Refer to the welded portion W1 shown in phase shift).

As shown in FIG. 2, the mounting flange 65 extends radially outward from the outer ring fitting portion 64. The mounting flange 65 is a portion for mounting the brake device 1 on another member, and has a plurality of mounting holes 65A for passing bolts and rivets (not shown).
The spring engaging portion 66 is a plate-shaped portion extending from the lower end of the outer ring fitting portion 64 to the input side in the axial direction. The spring engaging portion 66 engages with the return spring 85. The spring engaging portion 66 has a detachment prevention portion 66B extending on both sides in the circumferential direction at an end portion on the input side.

As shown in FIG. 4, in the output side rotating member 30, the first shaft portion 32 is pivotally supported by the first bearing portion 13 of the outer ring member 10. Then, the input-side end of the first bearing portion 13 comes into contact with the output-side side surface of the action portion 31 of the output-side rotating member 30 in the axial direction, so that the output-side rotating member 30 is on one side in the axial direction ( Restrict movement to the output side).
Further, in the output side rotating member 30, the second shaft portion 33B is pivotally supported by the second bearing portion 67 of the cover member 60. Then, the output side surface of the second bearing portion 67 abuts on the input side side surface of the intermediate shaft portion 33A of the output side rotating member 30 in the axial direction, so that the output side rotating member 30 is on the other side in the axial direction ( Restrict movement to the input side).

Next, the configuration of the ratchet section 2 will be described.
As shown in FIGS. 2 and 5, the operation ring 150 can be rotated in a predetermined angle range from the neutral position N (see FIG. 1) together with the operation member 110 by engaging with the operation member 110. As described above, the lever 75 (see FIGS. 1 and 4) is fixed to the operating member 110. The operation ring 150 is a member that transmits the rotational torque from the lever 75 to the input side rotating member 40 via the second roller 82 by moving integrally with the input side rotating member 40 via the second roller 82. is there. Therefore, the operation ring 150 has a ring portion 151 and an operation engagement portion 152.

The ring portion 151 has a ring-shaped side wall portion 151A and an outer peripheral portion 151B extending from the radial outer end portion of the side wall portion 151A to the input side.
The operation engaging portion 152 is provided so as to project from the ring portion 151 toward the input side in the axial direction. Three operation engaging portions 152 are arranged at equal intervals in the circumferential direction.
The side wall portion 151A has a circular through hole 151C, and the through hole 151C has an inner diameter slightly larger than the outer diameter of the intermediate shaft portion 33A of the output side rotating member 30. By fitting the through hole 151C with the intermediate shaft portion 33A, the operation ring 150 can rotate around the output side rotating member 30.

As shown in FIG. 8, the ring portion 151 has three arcuate small diameter portions 153 on the outer peripheral surface and a working surface that extends continuously in the circumferential direction from the small diameter portion 153 and gradually becomes larger in diameter than the small diameter portion 153. It has 155 and. The ring portion 151 has three protruding portions 154 that protrude from the working surface 155 so as to approach the inner peripheral surface 41B of the pressure receiving ring portion 41 that is the load input surface. The small diameter portion 153 and the protruding portion 154 are alternately arranged in the circumferential direction, and a total of six working surfaces 155 are arranged between the protruding portion 154 and the small diameter portion 153 that are adjacent to each other in the circumferential direction.

The working surface 155 is radially opposed to the inner peripheral surface 41B. Further, the working surface 155 is not parallel to the inner peripheral surface 41B, and is formed so that the distance from the inner peripheral surface 41B becomes narrower as it approaches the protruding portion 154.

A second roller 82 is arranged between each working surface 155 and the inner peripheral surface 41B of the pressure receiving ring portion 41, respectively. As will be understood in the operation description described later, the second roller 82 engages and disengages the operation ring 150 and the input side rotating member 40 to transmit and disconnect the input torque. A total of six second rollers 82 are arranged corresponding to each working surface 155.

Here, returning to FIG. 2, the regulation member 71 will be described. The regulating member 71 is a member that regulates the position of the second roller 82, and is a side wall portion 71A arranged on the output side of the plurality of second rollers 82 and the operation ring 150, and from the outer peripheral edge of the side wall portion 71A to the input side. It is configured with three regulatory units 71B extending toward it. The regulating portion 71B is longer than the axial length of the second roller 82, and its tip is press-fitted into the fitting hole 61C of the cover member 60 (see also FIG. 5). Further, the regulation member 71 has a hole 71C in which the intermediate shaft portion 33A of the output side rotating member 30 is arranged at the center.

As shown in FIG. 8, the regulating portion 71B is arranged at the same rotational position on the radial outer side of the protruding portion 154 when the lever 75 is not operated, and is located between the working surface 155 and the pressure receiving ring portion 41. The movement of the second roller 82 in the circumferential direction is restricted. A second spring 87 made of a compression coil spring is arranged between the two second rollers 82 arranged between the adjacent regulation portions 71B with an initial load applied to each of them. Therefore, when the second roller 82 is not operating in FIG. 8, each second roller 82 is in contact with the regulating portion 71B. Here, the regulating portion 71B is arranged so as to include a portion where the center of the second roller 82 is located in the radial direction, and is in contact with the portion of the second roller 82 that protrudes most in the circumferential direction. As a result, the regulating unit 71B can stably support the second roller 82. In FIG. 8, the second roller 82 is shown in contact with the regulating portion 71B, but the second roller 82 is sandwiched between the working surface 155 and the inner peripheral surface 41B, so that the regulating portion 71B is held. It may be slightly away from.

The second roller 82 is a member that is sandwiched between the working surface 155 and the inner peripheral surface 41B of the input side rotating member 40 so that the input side rotating member 40 follows the rotating operation of the operation ring 150.
A plurality of second rollers 82 are arranged between the inner peripheral surface 41B of the input side rotating member 40 and the working surface 155. Specifically, a total of six second rollers 82 are provided at positions corresponding to the respective working surfaces 155 of the operation ring 150.
The second spring 87 urges the two second rollers 82 arranged between the adjacent regulating portions 71B so as to keep the two second rollers 82 away from each other, whereby each of the second rollers 82 of the input side rotating member 40 It is urged toward the narrower gap between the inner peripheral surface 41B and the working surface 155.

As shown in FIGS. 6 and 9, the operating member 110 is a member to which the lever 75 is attached. The operation member 110 is a member that rotates around the rotation axis X1 together with the lever 75, thereby rotating and operating the input side rotation member 40. The operation member 110 is arranged on the input side in the axial direction with respect to the cover member 60.
The operating member 110 has a mounting surface portion 111, a first extending portion 113 extending upward and downward from the mounting surface portion 111, and a second extending portion 114 extending laterally from the mounting surface portion 111.

The mounting surface portion 111 has a disk shape orthogonal to the rotation axis X1. The mounting surface portion 111 has an engaging hole 112, a first positioning convex portion 115, a second positioning convex portion 116, and a mounting hole 118 centered on the rotation axis X1.

The engaging holes 112 are through holes extending in an arc shape in the circumferential direction, and three engaging holes 112 are provided at equal intervals in the circumferential direction. The edge of the engaging hole 112 is welded to the operating engaging portion 152 by laser welding at the welded portion W3 in a state where the operating engaging portion 152 is engaged (see also FIG. 5).

The first positioning convex portion 115 is a portion that protrudes toward the output side in the axial direction, and is provided with three portions at equal intervals in the circumferential direction. Each first positioning convex portion 115 extends in an arc shape centered on the rotation axis X1 and is orthogonal to the rotation axis X1 of the operating member 110 with respect to the cover member 60 by engaging with the tapered concave portion 61P. Approximate positioning in the direction of rotation is performed (see FIG. 4).

The second positioning convex portion 116 is a portion protruding toward the output side in the axial direction, and three of the second positioning convex portions 116 are provided at equal intervals in the circumferential direction. The second positioning convex portion 116 is formed in a dot shape when viewed from the axial direction. As shown in FIG. 4, the second positioning convex portion 116 is brought into contact with the cover portion 61 of the cover member 60 so that the operation member 110 is positioned in the axial direction with respect to the cover member 60.

The mounting hole 118 is a hole into which the shaft portion 77A of the screw 77 for fixing the lever 75 to the operating member 110 is screwed.

As shown in FIGS. 6 and 9, the first extending portion 113 is provided on a part of the outer peripheral portion of the operating member 110, here, on the upper portion and the lower portion. Each first extending portion 113 has an axially protruding portion 113A that projects toward the input side in the axial direction by being bent. Further, each of the first extending portions 113 has a spring engaging portion 113B extending from the axially protruding portion 113A to the output side in the axial direction and a disengagement extending from the end of the spring engaging portion 113B on the input side to both sides in the circumferential direction. It has a prevention unit 113C.

The second extending portion 114 is provided in a part of the outer peripheral portion of the operating member 110, in this case, in front of the vehicle seat S. The second extending portion 114 has an axially protruding portion 114A that protrudes toward the input side in the axial direction by being bent.

As shown in FIG. 2, the return spring 85 is an arc-shaped leaf spring, and has return engaging portions 85A extending radially outward at both ends. The return spring 85 constantly urges the operating member 110 and the operating ring 150 toward the neutral position N.
Specifically, as shown in FIG. 8, in the return spring 85, the return engaging portion 85A is placed below the spring engaging portion 66 of the cover member 60 and one spring engaging portion 113B of the operating member 110. It is engaged with the spring engaging portion 113B located.

As shown in FIG. 9, the lever 75 is a lever that rotates integrally with the operating member 110. The lever 75 has a notch 75A, an engagement hole 75B, a guide hole 75C, and a mounting hole 75D.
The notch 75A is a notch formed in the upper and lower edges of the lever 75. Each notch 75A engages with the axial protrusion 113A to position the lever 75 in the rotational direction with respect to the operating member 110.
The engagement hole 75B is a hole located in front of the vehicle seat S with respect to the rotation axis X1. The engaging hole 75B engages with the axially projecting portion 113A to position the lever 75 in the rotational direction with respect to the operating member 110.
Three guide holes 75C are provided at positions and shapes corresponding to the three operation engaging portions 152. The guide hole 75C guides the approximate direction of the lever 75 with respect to the operating member 110 when the lever 75 is assembled to the operating member 110.
The mounting hole 75D is a through hole through which the shaft portion 77A of the screw 77 passes when the lever 75 is mounted on the operating member 110.

When fixing the lever 75 to the operating member 110, as shown in FIGS. 4 and 9, the notch 75A is engaged with the axially protruding portion 113A, and as shown in FIGS. 5 and 9. , The engaging hole 75B is engaged with the axially protruding portion 114A, the screw 77 is passed through the washer 76 and the mounting hole 75D, and the screw 77 is screwed into the mounting hole 118 of the operating member 110. As a result, the lever 75 is fixed to the operating member 110, and the operating member 110 rotates integrally with the lever 75.

Next, the operation of the brake device 1 configured as described above will be described.
First, the operation of the ratchet unit 2 will be described.
As shown in FIG. 10, when the lever 75 (not shown in FIG. 10) is pulled up from the neutral position N, the operating member 110 rotates clockwise. At this time, of the return engaging portion 85A of the return spring 85, the return engaging portion 85A on the left side of the drawing is pushed to the left by the spring engaging portion 113B on the lower side of the drawing. On the other hand, the return engaging portion 85A on the right side does not move while being engaged with the spring engaging portion 66 of the cover member 60. As a result, the return spring 85 is elastically deformed so that the two return engaging portions 85A are separated from each other. Due to the restoring force of this elastic deformation, the return spring 85 is urged to return the lever 75 to the neutral position N (rotate it counterclockwise). This operation is the same even when the lever 75 is pushed down, only in the opposite direction of rotation, and the return spring 85 tries to return the lever 75 to the neutral position N (rotates clockwise). To urge.

By pulling up the lever 75, when the operation ring 150 rotates clockwise from the state shown in FIG. 8 to the state shown in FIG. 10, the working surface 155 adjacent to the clockwise side of the protrusion 154 and the input side The second roller 82 is sandwiched between the rotating member 40 and the inner peripheral surface 41B. On the other hand, the working surface 155 adjacent to the counterclockwise side of the protruding portion 154 moves away from the facing second roller 82. Therefore, due to the frictional force between the second roller 82 and the input side rotating member 40 and the frictional force between the second roller 82 and the operation ring 150, the operation ring 150, the three second rollers 82, and the input side rotating member 40 are integrated. And rotate clockwise.

When the lever 75 is returned to the neutral position N from the state shown in FIG. 10, the working surface 155 adjacent to the clockwise side of the protrusion 154 escapes counterclockwise from the second roller 82 in contact. Therefore, as shown in FIG. 11, the second roller 82 is not sandwiched between the working surface 155 and the outer peripheral surface 41A, and only the operation ring 150 of the operation ring 150 and the input side rotating member 40 is counterclockwise. The input side rotating member 40 does not rotate. The second roller 82 adjacent to the clockwise side of the protrusion 154 moves counterclockwise following the escaping working surface 155.

When the lever 75 is moved up or down from the neutral position N in this way, the input side rotating member 40 rotates following the operation ring 150, but when the lever 75 is returned to the neutral position N, , Only the operation ring 150 rotates, and the input side rotating member 40 does not rotate.

Next, the operation of the brake unit 3 will be described.
As shown in FIG. 12, when the output side rotating member 30 is given a counterclockwise rotation torque (rotation torque in the normal use range) by the weight of the occupant sitting on the vehicle seat S, the output side is output. The rotating member 30 rotates slightly counterclockwise, and the first roller 81B adjacent to the clockwise side of the first spring 86 in FIG. 12 is sandwiched between the facing surface 36 and the inner surface 23.

At this time, the facing surface 36 pushes the first roller 81B with the force F1, and the first roller 81B pushes the inner side surface 23 with the force F2. As a result, in the brake shoe 20, the pair of brake surfaces 21 are pressed against the inner peripheral surface 14 of the outer ring 11 by the force F3. As a result, a frictional force is generated between the brake surface 21 and the inner peripheral surface 14, so that the output side rotating member 30 does not rotate. That is, a braking force is generated to prevent the vehicle seat S from lowering. Then, in such a state where the output side rotating member 30 is subjected to the rotational torque in the normal use range, the support surface 26 is separated from the inner peripheral surface 14 of the outer ring 11.

At this time, the first roller 81A is separated from the adjacent first engaging portion 42A in the counterclockwise direction. Therefore, not only the first roller 81B is sandwiched between the facing surface 36 and the inner side surface 23, but also the first roller 81A is maintained in a state of being sandwiched between the facing surface 36 and the inner side surface 23 by the urging force of the first spring 86. can do.

Further, when the lever 75 is operated to rotate the input side rotating member 40 clockwise from the braking state of FIG. 12 in order to raise the height of the vehicle seat S, the first engagement is performed as shown in FIG. When the portion 42A pushes the first roller 81A, the first roller 81A is not sandwiched between the facing surface 36 and the inner side surface 23. As a result, the balance of the force pressing the brake shoe 20 against the inner peripheral surface 14 of the outer ring 11 is lost, and the braking force is released. Then, when the input side rotating member 40 is further rotated clockwise, the second engaging portion 42B hits the second protruding portion 25B and pushes the brake shoe 20 in the circumferential direction. At about the same time, when the convex surface portion 47 (see FIG. 7) hits the facing surface 36, the output side rotating member 30 rotates clockwise, and the first roller 81B is strongly sandwiched between the inner side surface 23 and the facing surface 36. Release the state that was set. As a result, when the first roller 81B is strongly sandwiched between the inner side surface 23 and the facing surface 36, it is possible to suppress the feeling of being caught when the input side rotating member 40 is rotated to start lifting the vehicle seat S. ..
The convex surface portion 47 is more likely to hit the facing surface 36 when the load applied to the seat is particularly large, such as when the weight of the occupant or the like is large.

When the brake shoe 20 is rotated clockwise, the inner surface of the brake shoe 20 pushes the first roller 81B with the force F12, and the first roller 81B pushes the facing surface 36 with the force F13. This force F13 causes the output side rotating member 30 to rotate clockwise.

Further, when the lever 75 is operated to rotate the input side rotating member 40 counterclockwise in order to lower the height of the vehicle seat S from the braking state of FIG. 12, as shown in FIG. 14, the second engagement is performed. When the joint portion 42B pushes the first roller 81B, the first roller 81B is not sandwiched between the facing surface 36 and the inner side surface 23. As a result, the balance of the force pressing the brake shoe 20 against the inner peripheral surface 14 of the outer ring 11 is lost, and the braking force is released. Then, when the input side rotating member 40 is further rotated counterclockwise, the first engaging portion 42A hits the first protruding portion 25A and pushes the brake shoe 20 in the circumferential direction.

When the brake shoe 20 is rotated counterclockwise, the inner surface of the brake shoe 20 pushes the first roller 81A with the force F12, and the first roller 81A pushes the facing surface 36 with the force F13. This force F13 causes the output side rotating member 30 to rotate counterclockwise.

In the above operation of the brake unit 3, when the braking force is released, the friction member 90 gives resistance to the rotation of the output side rotating member 30 with respect to the outer ring 11, so that the output side rotating member 30 may rotate rapidly. It is suppressed.

When a large impact load is applied on the vehicle seat S, or when an excessive counterclockwise rotational torque is input and the output side rotating member 30 rotates significantly counterclockwise, the output side rotating member 30 rotates significantly counterclockwise. The brake shoe 20 bends, and the support surface 26 hits the inner peripheral surface 14 (not shown). As a result, further bending of the brake shoe 20 is suppressed, and it is possible to prevent a large load from being applied to the brake shoe 20.

According to the brake unit 3 applied to the brake device 1 of the present embodiment described above, the following effects can be obtained.
In the braking device 1, the first bearing portion 13 of the housing 100 regulates the movement of the output side rotating member 30 to one side in the axial direction, and the second bearing portion 67 regulates the movement of the output side rotating member 30 to one side in the axial direction. Regulate movement to. Therefore, the durability of the brake device 1 can be increased.

Further, the first engaging portion 42A of the input side rotating member 40 is arranged between the first protruding portion 25A and the pair of first rollers 81, and the first engaging portion 42A of the input side rotating member 40 is arranged between the second protruding portion 25B and the pair of first rollers 81. By arranging the second engaging portion 42B of the input side rotating member 40, the diameter of the input side rotating member 40 can be reduced. Further, the brake shoe 20 has a recess provided on the inner side surface 23 by having the first protruding portion 25A and the second protruding portion 25B, and the first engaging portion 42A and the second engaging portion 42B have a recess. Since it is arranged in this recessed space, the space between the outer ring 11 and the output side rotating member 30 can be effectively used. As a result, the brake shoe 20 can be made smaller and lighter.

Further, the first engaging portion 42A and the second engaging portion 42B not only have a function of pushing the brake shoe 20 in the rotational direction to rotate the brake shoe 20, but also push the first roller 81 in the rotational direction to release the braking force. It also has the function of That is, since the first engaging portion 42A and the second engaging portion 42B have two functions, the brake device 1 can be made smaller and lighter.

Further, by arranging the first engaging portion 42A, the second engaging portion 42B, and the contact convex portion 46 on one circumference C1 centered on the rotation axis X1 of the output side rotating member 30, the outer ring 11 and the outer ring 11 are arranged. The brake device 1 can be made smaller and lighter by effectively utilizing the space between the output side rotating members 30.

Further, by providing the groove 48 in the input side rotating member 40, the weight of the input side rotating member 40 can be reduced and the weight of the brake device 1 can be reduced.

Further, the brake shoe 20 is arranged so that the acting portion 31 is inserted into the recess between the first protruding portion 25A and the second protruding portion 25B, so that the space between the first protruding portion 25A and the second protruding portion 25B is formed. The brake device 1 can be made smaller and lighter by effectively utilizing the above.

Further, the output-side rotating member 30 has a recess 37 on the rotation axis X1 for accommodating a screw 77 for attaching a lever 75 for rotating the input-side rotating member 40, thereby making the output-side rotating member 30 lightweight. The weight of the brake device 1 can be reduced.

Next, the brake device 1A according to the second embodiment will be described in detail with reference to the drawings as appropriate.
As shown in FIG. 15, the brake device 1A is applied to a height adjusting mechanism for adjusting the height of the seat cushion S1 of the vehicle seat S as an example of the vehicle seat. In the brake device 1A, the lever 59 is attached to the operating member 55 of the brake device 1A. Then, by operating the lever 59, the height of the seat cushion S1 can be adjusted by rotating the output side rotating member 30, which will be described later, to drive the height adjustment mechanism. Specifically, when the lever 59 is raised from the neutral position N, the seat cushion S1 is raised by a predetermined amount, and when the lever 59 is lowered from the neutral position N, the seat cushion S1 is lowered by a predetermined amount. When the lever 59 is returned from the upper or lower position to the neutral position N, the output side rotating member 30 does not rotate.

As shown in FIG. 16, the brake device 1A is configured such that each member is housed in a housing 100. The housing 100 is composed of a combination of an outer ring member 10, a first cover member 160, and a second cover member 170. Further, in the following description, the left side of FIG. 16 in which the operating member 55 is arranged is referred to as an “input side”, and the right side of FIG. 16 in which the output gear 35 of the output side rotating member 30 is arranged is referred to as an “output side”. ..

The brake device 1A is provided on the input side and is provided on the ratchet portion 2 for transmitting and shutting off the input torque due to the rotational operation of the operating member 55, and is provided on the output side and is provided on the output side to transmit the input torque from the ratchet portion 2 to the output side rotating member 30. It is provided with a brake unit 3 that transmits the torque to the output gear 35 and cuts off the reverse input torque from the output gear 35.

Explaining the outline of the components of the ratchet portion 2 and the brake portion 3, the ratchet portion 2 includes an operation member 55, an operation ring 51, a second roller 82 as an example of the second movable piece, and a second spring 87. , The return spring 85 and the input side rotating member 40 are provided. Further, the brake unit 3 includes an outer ring member 10, a brake shoe 20, an output side rotating member 30, an input side rotating member 40, a first roller 81, a first spring 86, and a friction member 90. Become. The input-side rotating member 40 is an output member of the ratchet section 2 and an input member of the brake section 3, and can be said to be any component of the ratchet section 2 and the brake section 3.

A plurality of holes 12H are provided in the side wall portion 12. The plurality of holes 12H support the brake shoe 20 from below when the outer ring member 10 is placed with the output side facing down and the brake shoe 20 is placed in the outer ring 11 when the brake device 1A is assembled. It is a hole for passing a pin as a tool. By supporting the brake shoe 20 with such a pin, the brake shoe 20 is arranged at a predetermined height (position in the axial direction) regardless of the accuracy of the side wall portion 12, and the first roller 81 or the like is used. Parts can be assembled.

One outer protrusion 20B is provided on each brake shoe 20 at both ends in the circumferential direction of the outer circumference of the main body 20A, that is, a pair. Each outer protrusion 20B has a brake surface 21 at the tip on the outer side in the radial direction, which faces the inner peripheral surface 14 of the outer ring 11 and can come into contact with the inner peripheral surface 14. The brake surface 21 has substantially the same curvature as the inner peripheral surface 14 of the outer ring 11, and as shown in FIG. 17, the outer side of the brake surface 21 in the circumferential direction (the outer side in the circumferential direction with respect to each brake shoe 20). Is arranged so as to come into contact with the inner peripheral surface 14 of the outer ring 11. As a result, when the brake shoe 20 is urged outward in the radial direction, the peripheral end region of the brake surface 21 in the circumferential direction is pressed against the inner peripheral surface 14 of the outer ring 11.

As shown in FIG. 16, the central protrusion 20C is provided at the central portion in the circumferential direction of the outer periphery of the main body portion 20A. A support surface 26 capable of contacting the inner peripheral surface 14 of the outer ring 11 is provided at the radial outer tip of the central protrusion 20C. In other words, the support surface 26 is provided at the center between the pair of brake surfaces 21. The support surface 26 has substantially the same curvature as the inner peripheral surface 14 of the outer ring 11, and has a cylindrical surface shape along the inner peripheral surface 14 of the outer ring 11. The support surface 26 is separated from the inner peripheral surface 14 of the outer ring 11 in a state where the brake shoe 20 and the output side rotating member 30 are not loaded.

As shown in FIG. 17, each of the inner side surfaces 23 has a first contact surface 23A that inclines toward the facing surface 36 (lower side in the figure) of the output side rotating member 30 as it goes outward in the circumferential direction. doing. The first contact surface 23A is in contact with the first roller 81.

The output side rotating member 30 is arranged inside the brake shoe 20 in the radial direction. As shown in FIG. 16, the output-side rotating member 30 protrudes from the shaft-shaped acting portion 31, the first shaft portion 32 formed on the output side of the acting portion 31, and the acting portion 31 to the input side, and has a second position. It is configured to include a second shaft portion 33 coaxial with the first shaft portion 32, and an output gear 35 formed so as to project toward the output side of the first shaft portion 32. The output gear 35 projects to the output side through the shaft support hole 12A of the side wall portion 12 (see FIG. 18).

As shown in FIG. 19, the working portion 31 has an facing surface 36 facing the inner side surface 23 of the brake shoe 20 and a connecting surface 38 on the outer periphery thereof. Three facing surfaces 36 are provided on the outer periphery of the working portion 31 corresponding to the inner surface 23 of each brake shoe 20. A pair of first rollers 81 are arranged between each inner side surface 23 and each facing surface 36. Further, the connecting surface 38 is a portion that connects each of the facing surfaces 36 in the circumferential direction, and is provided between a pair of facing surfaces 36 adjacent to each other in the circumferential direction of the outer periphery of the working portion 31, for a total of three. There is. The connecting surface 38 is formed as a curved surface having an arc shape in cross section centered on the rotation axis X1 of the output side rotating member 30.

A total of three pairs of first rollers 81 are arranged between the inner side surface 23 of each brake shoe 20 and the corresponding facing surfaces 36 of the output side rotating member 30. The pair of first rollers 81 is an example of a pair of first movable pieces. The first roller 81 is arranged between the first protruding portion 25A and the second protruding portion 25B of the brake shoe 20 in the circumferential direction. Here, of the pair of first rollers 81 arranged between the inner side surfaces 23 and the corresponding facing surfaces 36, the one arranged on the counterclockwise side in FIG. 19 is referred to as the first roller 81A, and the clockwise side. The one arranged in is referred to as the first roller 81B. The first roller 81 is sandwiched between the inner side surface 23 and the facing surface 36 in a state where the brake shoe 20 and the output side rotating member 30 are not loaded.
When a torque for rotating the output side rotating member 30 is input from the outside, the facing surface 36 indirectly pushes the inner surface 23 of the brake shoe 20 via the first roller 81, and the brake shoe 20 is the brake surface. 21 is pressed against the inner peripheral surface 14 of the outer ring 11. The first roller 81 is sandwiched between the inner side surface 23 and the facing surface 36 to generate a braking force of the brake shoe 20.

first rollers

81A and 81B. The first spring 86 urges the pair of

first rollers

As shown in FIG. 16, the input-side rotating member 40 is rotatable around the rotation axis X1 of the output-side rotating member 30. The input-side rotating member 40 is a member capable of outputting the rotation of the ratchet portion 2 and contacting the brake shoe 20 of the brake portion 3 in the circumferential direction to apply rotational torque to the brake shoe 20. The input side rotating member 40 has a cylindrical pressure receiving ring portion 41 and a plurality of engaging portions 42 protruding from the output side end portion of the pressure receiving ring portion 41 toward the output side in the axial direction.

The pressure receiving ring portion 41 has an outer peripheral surface 41A and an inner peripheral surface 41B.
The outer peripheral surface 41A is a cylindrical surface having no unevenness.
The inner peripheral surface 41B has a convex surface portion 47 projecting inward in the radial direction as a part of the cylindrical surface.

As shown in FIGS. 17 and 20, a total of six engaging portions 42 are provided, two for each brake shoe 20. The two engaging portions 42 corresponding to the brake shoes 20 are the first engaging portion 42A arranged between the first roller 81A and the first protruding portion 25A, and the first roller 81B and the second protruding portion 25B. It includes a second engaging portion 42B arranged between them.

The first engaging portion 42A and the second engaging portion 42B have a function of releasing the braking force by the brake shoe 20 and rotating the brake shoe 20.
As shown in FIG. 26, when the input side rotating member 40 rotates in the first rotation direction (clockwise in FIG. 26), the first engaging portion 42A is one of the pair of first movable pieces. The roller 81A is pushed to release the braking force, and the second engaging portion 42B pushes the second protruding portion 25B to rotate the brake shoe 20 in the first rotation direction.
On the other hand, as shown in FIG. 27, when the input side rotating member 40 rotates in the second rotation direction (counterclockwise in FIG. 27) opposite to the first rotation direction, the second engaging portion 42B is paired. The first roller 81B, which is the other end of the first movable piece, is pushed to release the braking force, and the first engaging portion 42A pushes the first protruding portion 25A to rotate the brake shoe 20 in the second rotation direction.

As shown in FIG. 21, each convex surface portion 47 has a top portion 47A protruding most radially inward and a release surface 47B adjacent to the top portion 47A on the clockwise side (counterclockwise side in FIG. 20) of FIG. And a flank 47C adjacent to the counterclockwise side of FIG. 21 (clockwise side in FIG. 20).

Inside the pressure receiving ring portion 41, the acting portion 31 of the output side rotating member 30 is arranged. Of the inner peripheral surface 41B of the input-side rotating member 40, the cylindrical portion is fitted with the connecting surface 38 of the working portion 31, and the convex surface portion 47 faces the facing surface 36.

On the release surface 47B, the rotation torque in the counterclockwise direction of FIG. 21 due to the weight of the occupant sitting on the vehicle seat S is input to the output side rotation member 30, and the input side rotation member 40 is referred to as the rotation torque. It is abbreviated as the time when the second engaging portion 42B abuts on the second protruding portion 25B of the brake shoe 20 in the circumferential direction when rotated in the opposite rotation direction (clockwise direction in FIG. 21) (see FIG. 26). At the same time, it has a shape capable of transmitting rotational torque to the output side rotating member 30 by contacting the facing surface 36 (the portion of the release surface 47B close to the top 47A). That is, the input-side rotating member 40 can come into contact with the output-side rotating member 30 to rotate the output-side rotating member 30.

The flank 47C is when the input side rotating member 40 is rotated in the counterclockwise direction of FIG. 17 and the first engaging portion 42A comes into contact with the first protruding portion 25A of the brake shoe 20 in the circumferential direction (FIG. 27). (See), the shape is such that it does not abut on the facing surface 36. However, the flank 47C may have a shape that exerts the same function as the release surface 47B. In other words, a release surface may be provided corresponding to each rotation direction.

As shown in FIG. 16, the friction member 90 is a member that generates an auxiliary braking force for suppressing the sudden start of operation of the output side rotating member 30 at the moment when the braking force of the braking portion 3 is cut off. .. The friction member 90 is arranged between the brake shoe 20 and the side wall portion 12 of the outer ring member 10. The friction member 90 has a plate-shaped main body portion 91 and three spacing holding portions 92 protruding from the main body portion 91 toward the input side.
The main body 91 has a fitting hole 93 at the center that matches the outer peripheral shape of the working portion 31. Further, the main body 91 has a plurality of friction protrusions 94 protruding outward in the radial direction on the outer periphery. Further, the main body 91 has a plurality of through holes 95 for reducing the weight and for determining the phase of the friction member 90 by inserting the pin described above at the time of assembly. The through hole 95 overlaps with the hole 12H of the outer ring member 10 when viewed from the axial direction (not shown).
When the fitting hole 93 is fitted with the acting portion 31, the friction member 90 rotates integrally with the output side rotating member 30.
The friction protrusion 94 has a dimension of pressure contact with the inner peripheral surface 14 of the outer ring 11, and when the friction protrusion 94 presses against the inner peripheral surface 14, appropriate friction between the friction protrusion 94 and the inner peripheral surface 14 Force is generated.

As shown in FIG. 17, the interval holding portion 92 is a portion arranged between the brake shoes 20 in the circumferential direction to hold the interval in the rotation direction of the brake shoes 20. A plurality of interval holding portions 92 are provided according to the number of brake shoes 20, and here, three are provided. Each interval holding portion 92 is arranged in a substantially triangular space surrounded by two brake shoes 20 adjacent to each other in the circumferential direction and a connecting surface 38 of the output side rotating member 30. That is, since the space holding portion 92 is arranged by effectively utilizing the space between the two brake shoes 20 and the output side rotating member 30, it is possible to suppress the increase in size of the brake portion 3.

Next, the configuration of the housing 100 will be described.
As shown in FIGS. 16 to 18, the housing 100 includes an outer ring member 10, a first cover member 160, and a second cover member 170, and the housing 100 includes a brake shoe 20 and an output-side rotating member. The action unit 31, the input side rotating member 40, the operation ring 51, the first roller 81, the second roller 82, the first spring 86, the second spring 87, and the friction member 90 are housed. As shown in FIG. 18, the housing 100 includes a first bearing portion 13 that pivotally supports the output side rotating member 30, and a second bearing portion 175 that is located away from the first bearing portion 13 in the axial direction. It has a second bearing portion 175 that pivotally supports the output side rotating member 30. The second bearing portion 175 is provided on the second cover member 170.

The first cover member 160 is made of a metal plate, and has a first cover portion 161, an outer ring fitting portion 162, a mounting flange 163, and a regulation protrusion 164.

The first cover portion 161 is made of a plate having a circular contour. The first cover portion 161 is arranged on the input side of the brake shoe 20, the first roller 81, and the first spring 86 in the axial direction. The second roller 82 described above is arranged on the input side of the first cover portion 161. As a result, the first cover portion 161 regulates the movement of the brake shoe 20, the first roller 81, and the first spring 86 to the other side (input side) in the axial direction. Further, the first cover portion 161 regulates the movement of the second roller 82 to one side (output side) in the axial direction. The first cover portion 161 has a hole 161A into which the input side rotating member 40 can be inserted. Have. The input-side rotating member 40 can rotate inside the hole 161A.

The outer ring fitting portion 162 has a cylindrical shape extending from the radial end of the first cover member 160 to the output side in the axial direction. As shown in FIG. 18, the outer ring fitting portion 162 is fitted to the outer peripheral surface 15 of the outer ring 11. Then, the inner peripheral surface 162G of the outer ring fitting portion 162 is welded to the outer peripheral surface 15 of the outer ring 11 by irradiating the laser beam of laser welding from the radial outside of the outer ring fitting portion 162 (FIG. 18). , Refer to the welded portion W1 shown in phase shift).

As shown in FIG. 16, the mounting flange 163 extends radially outward from the outer ring fitting portion 162. The mounting flange 163 is a portion for mounting the brake device 1A to another member, and has a plurality of mounting holes 163A for passing bolts and rivets (not shown).

The regulation protrusion 164 protrudes from the first cover portion 161 toward the input side in the axial direction. As shown in FIG. 21, the regulation protrusion 164 is arranged between the plurality of second rollers 82. The regulation protrusion 164 comes into contact with the second roller 82 at a position where the distance from the rotation axis X1 of the output side rotating member 30 is smaller than the center of the second roller 82. Therefore, the second roller 82 is urged outward in the radial direction by the reaction force received from the regulation protrusion 164. That is, the second roller 82 is pressed against the inner peripheral surface 52 of the operation ring 51 in a state of being in contact with the regulation protrusion 164.

As shown in FIG. 16, the second cover member 170 is made of a metal plate, and has a second cover portion 171, a guide portion 172, a positioning portion 173, a cover fitting portion 174, and a second bearing portion 175 (FIG. 16). 18) and.

The second cover portion 171 is made of a plate having a circular contour. The second cover portion 171 is arranged on the input side of the operation ring 51, the input side rotating member 40, the second roller 82, and the second spring 87 in the axial direction. As a result, the second cover portion 171 regulates the movement of the operation ring 51, the input side rotating member 40, the second roller 82, and the second spring 87 to the other side (input side) in the axial direction. The second cover portion 171 has a through hole 171B in the center in which the second shaft portion 33 of the output side rotating member 30 is arranged. The portion around the through hole 171B of the second cover portion 171 is the second bearing portion 175.
Further, the second cover portion 171 has three holes 171C extending in an arc shape along the circumferential direction. The hole 171C defines the orientation of the second cover member 170 with respect to the first cover member 160 by engaging the regulation protrusion 164. The regulation protrusion 164 engaged with the hole 171C protrudes from the second cover portion 171 toward the input side (see FIG. 19).

The guide portion 172 is a plate extending from the radial end of the second cover portion 171 to the output side in the axial direction. The guide portion 172 extends in an arc shape along the outer side of the outer peripheral surface 53A of the operation ring 51. Two guide portions 172 are provided so as to be separated from each other in the circumferential direction. The guide unit 172 guides the rotational operation of the operation ring 51 from the outside.

The positioning portion 173 is a portion extending radially outward from the output side end of the guide portion 172. The positioning unit 173 determines the position of the second cover member 170 in the axial direction by contacting the first cover unit 161 from the input side (see FIG. 18).

The cover fitting portion 174 is a plate extending from the radial outer end of the positioning portion 173 to the output side in the axial direction. The cover fitting portion 174 extends in an arc shape along the outside of the outer ring fitting portion 162 of the first cover member 160. As shown in FIG. 18, the cover fitting portion 174 is fitted to the outer peripheral surface 162F of the outer ring fitting portion 162. Then, the inner peripheral surface 174F of the cover fitting portion 174 is welded to the outer peripheral surface 162F of the outer ring fitting portion 162 by irradiating the laser beam of laser welding from the radial outside of the cover fitting portion 174. See welded part W2).

In the output side rotating member 30, the first shaft portion 32 is pivotally supported by the first bearing portion 13 of the outer ring member 10. Then, the input-side end of the first bearing portion 13 comes into contact with the output-side side surface of the action portion 31 of the output-side rotating member 30 in the axial direction, so that the output-side rotating member 30 is on one side in the axial direction ( Restrict movement to the output side).
Further, in the output side rotating member 30, the second shaft portion 33 is pivotally supported by the second bearing portion 175 of the second cover member 170. Then, the output-side surface of the second bearing portion 175 abuts on the input-side side surface of the action portion 31 of the output-side rotating member 30 in the axial direction, so that the output-side rotating member 30 is on the other side (input) in the axial direction. Regulate moving to the side).

Next, the configuration of the ratchet section 2 will be described.
As shown in FIG. 16, the operation ring 51 engages with the operation member 55 and can be rotated together with the operation member 55 within a predetermined angle range from the neutral position N. As described above, the lever 59 (see FIG. 15) is fixed to the operating member 55. The operation ring 51 is a member that transmits the rotational torque from the lever 59 to the input side rotating member 40 via the second roller 82 by moving integrally with the input side rotating member 40 via the second roller 82. is there. Therefore, the operation ring 51 has a ring portion 53 and an operation protrusion 51B protruding radially outward from the ring portion 53.

As shown in FIG. 21, the operation ring 51 has an inner peripheral surface 52. The inner peripheral surface 52 has a substantially circular shape, but has an inclined surface 52A whose radius gradually decreases. The inclined surface 52A is provided at equal intervals in the circumferential direction and is inclined so that the radius gradually decreases from the periphery of the small diameter portion 52B toward the small diameter portion 52B toward the small diameter portion 52B having the smallest radius. .. Since there are three small diameter portions 52B, a total of six inclined surfaces 52A are provided. When the operation ring 51 is in the neutral position N, the position of the small diameter portion 52B in the circumferential direction coincides with the position of the regulation protrusion 164.

A total of four operation protrusions 51B are arranged on the right side and the left side in FIG. 21, one pair at the top and bottom.

The outer peripheral surface 53A of the operation ring 51 has a cylindrical shape. The portion of the outer peripheral surface 53A between the pair of operating protrusions 51B has a slightly larger diameter than the other portions.

The second roller 82 is sandwiched between the inner peripheral surface 52 of the operation ring 51 and the outer peripheral surface 41A of the input side rotating member 40, so that the input side rotating member 40 follows the rotating operation of the operation ring 51. It is a member.
A plurality of second rollers 82 are arranged between the outer peripheral surface 41A of the input side rotating member 40 and the inner peripheral surface 52 of the operation ring 51. Specifically, a total of six second rollers 82 are provided, one on each inclined surface 52A of the operation ring 51.
The second spring 87 urges the adjacent second rollers 82 to move away from each other, whereby each of the second rollers 82 has a gap between the outer peripheral surface 41A and the inclined surface 52A of the input side rotating member 40. It is urged to the narrow side of.

As shown in FIG. 16, the return spring 85 is an arc-shaped leaf spring, and has hooks 85B extending inward in the radial direction at both ends. The return spring 85 constantly urges the operating member 55 and the operating ring 51 toward the neutral position N.

The operation member 55 is a member to which the lever 59 is attached and rotates about the rotation axis X1. The operation member 55 is arranged on the other side (input side) in the axial direction with respect to the second cover member 170.
The operating member 55 has a mounting surface portion 56, an outer peripheral portion 57, and a spring engaging portion 58.
The mounting surface portion 56 has a disk shape orthogonal to the rotation axis X1. The mounting surface portion 56 has a mounting hole 56B into which a bolt or the like (not shown) for mounting the lever 59 is inserted, and a hole 56C centered on the rotation axis X1.
The outer peripheral portion 57 extends axially from the radial outer end of the mounting surface portion 56 toward the output side. The outer peripheral portion 57 has a plurality of notched portions 57A that engage with each operating protrusion 51B. A total of four notches 57A are provided (only two are shown in the figure) corresponding to the operation protrusion 51B. By engaging the notch 57A with the operating protrusion 51B, the operating member 55 and the operating ring 51 can rotate integrally.
Further, the outer peripheral portion 57 has a flange 57B extending vertically in FIG. 16. The outer peripheral portion 57 is fitted to the outer peripheral surface 53A of the operation ring 51, and the laser beam of laser welding is applied from the outer side in the radial direction, so that the inner peripheral surface 57F (see FIG. 22) of the outer peripheral portion 57 is the operation ring 51. It is welded to the outer peripheral surface 53A of the above (see the welded portion W3 in FIG. 19). Specifically, the outer peripheral portion 57 is welded at a portion between the pair of operating protrusions 51B.

The spring engaging portion 58 is formed by cutting up a part of the mounting surface portion 56 toward the output side in the axial direction. Two spring engaging portions 58 are provided corresponding to the two 85A of the return spring 85.

The return spring 85 is arranged between the second cover portion 171 and the mounting surface portion 56 in the axial direction. As a result, the return spring 85 is restricted from moving to the output side in the axial direction by the second cover portion 171 and is restricted from moving to the input side in the axial direction by the mounting surface portion 56.
In the return spring 85, when the operating member 55 is in the neutral position N, the hooks 85B at both ends engage with the spring engaging portion 58, and the three regulating protrusions 164 projecting from the second cover portion 171 to the input side. Engage with two of them.

Next, the operation of the brake device 1A configured as described above will be described.
First, the operation of the ratchet unit 2 will be described.
As shown in FIG. 22, when the lever 59 (not shown in FIG. 22) is pushed down from the neutral position N, the operating member 55 rotates counterclockwise. At this time, since the lower spring engaging portion 58 of the operating member 55 is hooked on the hook 85B of the return spring 85, the lower spring engaging portion 58 pulls up the lower hook 85B. On the other hand, the upper spring engaging portion 58 is separated from the upper hook 85B, but the upper hook 85B does not move because the position is restricted by engaging with the upper regulating protrusion 164. As a result, when the lever 59 is pushed down, the return spring 85 is bent so that the radius becomes smaller, and the return spring 85 tries to return the lever 59 to the neutral position N (rotates clockwise). To urge. This operation is the same even when the lever 59 is pulled up, only upside down, and the return spring 85 tries to return the lever 59 to the neutral position N (rotates it counterclockwise). ) To be urged.

By pulling up the lever 59, when the operation ring 51 rotates clockwise as shown in FIG. 23 from the state shown in FIG. 21, the inclined surface 52A and the input side adjacent to the clockwise side of the small diameter portion 52B The second roller 82 is sandwiched between the rotating member 40 and the outer peripheral surface 41A. On the other hand, the inclined surface 52A adjacent to the counterclockwise side of the small diameter portion 52B moves away from the second roller 82 that was in contact with the small diameter portion 52B. Therefore, due to the frictional force between the second roller 82 and the input side rotating member 40 and the frictional force between the second roller 82 and the operation ring 51, the operation ring 51, the second roller 82, and the input side rotating member 40 are integrated into the clock. Rotate around.

When the lever 59 is returned to the neutral position N from the state shown in FIG. 23, the inclined surface 52A adjacent to the clockwise side of the small diameter portion 52B escapes counterclockwise from the contacting second roller 82. Therefore, as shown in FIG. 24, the second roller 82 is not sandwiched between the inclined surface 52A and the outer peripheral surface 41A, and only the operation ring 51 of the operation ring 51 and the input side rotating member 40 is counterclockwise. The input side rotating member 40 does not rotate. The second roller 82 adjacent to the clockwise side of the small diameter portion 52B moves counterclockwise following the escaping inclined surface 52A.

When the lever 59 is moved up or down from the neutral position N in this way, the input side rotating member 40 rotates following the operation ring 51, but when the lever 59 is returned to the neutral position N, , Only the operation ring 51 rotates, and the input side rotating member 40 does not rotate.

Next, the operation of the brake unit 3 will be described.
As shown in FIG. 25, when the rotation torque in the counterclockwise direction in the figure (rotation torque in the normal use range) is given to the output side rotation member 30 by the weight of the occupant sitting on the vehicle seat S, the output side is output. The rotating member 30 rotates slightly counterclockwise, and the first roller 81B adjacent to the clockwise side of the first spring 86 in FIG. 25 is sandwiched between the facing surface 36 and the inner surface 23.

Further, when the lever 59 is operated to rotate the input side rotating member 40 clockwise from the braking state of FIG. 25 in order to raise the height of the vehicle seat S, the first engagement is performed as shown in FIG. When the portion 42A pushes the first roller 81A, the first roller 81A is not sandwiched between the facing surface 36 and the inner side surface 23. As a result, the balance of the force pressing the brake shoe 20 against the inner peripheral surface 14 of the outer ring 11 is lost, and the braking force is released. Then, when the input side rotating member 40 is further rotated clockwise, the second engaging portion 42B hits the second protruding portion 25B and pushes the brake shoe 20 in the circumferential direction. Further, substantially at the same time, when the convex surface portion 47 (see FIG. 23) hits the facing surface 36, the output side rotating member 30 rotates in the clockwise direction, and the first roller 81B is strongly sandwiched between the inner side surface 23 and the facing surface 36. Release the state that was set. As a result, when the first roller 81B is strongly sandwiched between the inner side surface 23 and the facing surface 36, it is possible to suppress the feeling of being caught when the input side rotating member 40 is rotated to start lifting the vehicle seat S. ..
The convex surface portion 47 is more likely to hit the facing surface 36 when the load applied to the seat is particularly large, such as when the weight of the occupant or the like is large.

Further, when the lever 59 is operated to rotate the input side rotating member 40 counterclockwise in order to lower the height of the vehicle seat S from the braking state of FIG. 25, as shown in FIG. 27, the second engagement When the joint portion 42B pushes the first roller 81B, the first roller 81B is not sandwiched between the facing surface 36 and the inner side surface 23. As a result, the balance of the force pressing the brake shoe 20 against the inner peripheral surface 14 of the outer ring 11 is lost, and the braking force is released. Then, when the input side rotating member 40 is further rotated counterclockwise, the first engaging portion 42A hits the first protruding portion 25A and pushes the brake shoe 20 in the circumferential direction.

According to the brake unit 3 applied to the brake device 1A of the present embodiment described above, the following effects can be obtained.
In the braking device 1A, the first bearing portion 13 of the housing 100 regulates the movement of the output side rotating member 30 to one side in the axial direction, and the second bearing portion 175 regulates the movement of the output side rotating member 30 to one side in the axial direction. Regulate movement to. Therefore, the durability of the brake device 1A can be increased.

Further, the first cover portion 161 that regulates the movement of the brake shoe 20 to the other side in the axial direction is a second cover member 170 (the second cover member 170) that regulates the movement of the output side rotating member 30 to the other side in the axial direction. Since it is provided separately from the two bearing portions 175), the durability of the brake device 1A can be further increased.

Further, since the outer ring member 10 and the first cover member 160 are fixed on the surface where the outer ring 11 and the outer ring fitting portion 162 are fitted with a wide contact surface, the first cover member 160 is firmly attached to the outer ring member 10. It can be fixed to the brake device 1A to increase the rigidity of the brake device 1A.

Further, since the first cover member 160 and the second cover member 170 are fixed by the surface on which the outer ring fitting portion 162 and the cover fitting portion 174 are fitted, which has a wide contact surface, the second cover member 170 can be used. It can be firmly fixed to the first cover member 160 to increase the rigidity of the brake device 1A. Further, the outer ring fitting portion 162 is fitted to the outer peripheral surface 15 of the outer ring 11, and the cover fitting portion 174 is fitted to the outer ring fitting portion 162, whereby the first bearing portion 13 and the first bearing portion 13 of the outer ring member 10 are fitted. 2 The axis of the second bearing portion 175 of the cover member 170 can be accurately aligned. That is, the output-side rotating member 30 can be pivotally supported at an accurate position with respect to the housing 100.

Further, the first engaging portion 42A and the second engaging portion 42B of the input side rotating member 40 have a function for rotating the brake shoe 20 and a braking force by pushing the first roller 81A or the first roller 81B. It can also serve as a release function. As a result, the size of the brake device 1A can be reduced.

Further, the first cover portion 161 that regulates the movement of the second roller 82 to one side in the axial direction is provided separately from the side wall portion 12 that regulates the movement of the output side rotating member 30 to one side in the axial direction. Therefore, the durability of the brake device 1A can be further increased.

Further, when the second roller 82 is urged by the second spring 87, the second roller 82 is urged outward in the radial direction by hitting the regulation protrusion 164, and the position of the second roller 82 is stabilized. As a result, the brake device 1A can be operated stably.

Further, the operation ring 51 has an operation protrusion 51B protruding outward in the radial direction, the operation member 55 has a notch 57A that engages with the operation protrusion 51B, and the notch 57A has an operation protrusion 51B. By engaging, a structure for integrally rotating the operation member 55 and the operation ring 51 can be easily manufactured.

The

brake devices

1 and 1A according to the first and second embodiments described above can be appropriately modified and implemented.

In the first and second embodiments, both the inner side surface 23 and the facing surface 36 are inclined so as to approach each other at both ends in the circumferential direction, but only one of them is inclined. May be good.

In the first and second embodiments, the cover member 60 and the first cover member 160 are fixed to the outer ring 11 by laser welding, but they may be fixed by caulking.

In the first and second embodiments, the rollers are exemplified as the movable piece, the first movable piece and the second movable piece, but the movable piece may be a sphere, a polygonal prism, or a columnar having an elliptical cross section. Further, the first movable piece may be omitted. For example, the corner portion of the facing surface may be configured to hit the inner side surface, or the facing surface may be provided with a protrusion that hits the inner side surface.

In the first and second embodiments, three brake shoes 20 are provided, but the number of brake shoes may be two or four or more.

In the first and second embodiments, the brake shoe 20 has a support surface 26 between the pair of brake surfaces 21, but the brake shoe includes a support surface and a protrusion on which the support surface is provided. It does not matter if there is no configuration.

In the first and second embodiments, the input side rotating member 40 is arranged on the radial outside of the operation rings 150 and 51, but the input side rotating member 40 is reversed and the input is on the radial inside of the operation rings 150 and 51. The side rotating member 40 may be arranged.

Further, the brake unit 3, the ratchet unit 2, and the

brake devices

1, 1A are not only used for the height adjustment mechanism of the vehicle seat S, but can also be arbitrarily applied to other devices.

In addition, each element described in the above-described embodiment and modification may be arbitrarily combined and implemented.

Claims

An outer ring with a cylindrical inner peripheral surface,
A brake shoe having a pair of brake surfaces facing the inner peripheral surface and being in contact with the inner peripheral surface and an inner surface facing the inner peripheral surface in the radial direction, which are arranged side by side in the radial direction of the outer ring. When,
An output-side rotating member arranged inside the brake shoe in the radial direction and having an action portion having an opposing surface facing the inner side surface, and an output-side rotating member.
An input-side rotating member capable of rotating the output-side rotating member in contact with the brake shoe or the output-side rotating member.
A pair of movable pieces arranged between each of the inner side surfaces and the facing surface, and by being sandwiched between the inner side surface and the facing surface, a movable piece that generates a braking force of the brake shoe is generated. One piece,
It is provided with a first spring which is arranged between the pair of movable pieces and urges the pair of movable pieces so as to separate them from each other.
Each of the brake shoes has a first protruding portion arranged at one end in the circumferential direction and protruding inward in the radial direction, and a first protruding portion arranged at the other end in the circumferential direction and protruding inward in the radial direction. Has 2 protrusions
The pair of movable pieces are arranged between the first protrusion and the second protrusion.
The input-side rotating member projects in the axial direction with a first engaging portion arranged between the pair of movable pieces and the first protruding portion, which protrudes in the axial direction of the output-side rotating member. A second engaging portion arranged between the pair of movable pieces and the second protruding portion is provided corresponding to each brake shoe.
When the input-side rotating member rotates in the first rotation direction, the second engaging portion pushes the second protruding portion to rotate the brake shoe in the first rotation direction.
When the input-side rotating member rotates in the second rotation direction opposite to the first rotation direction, the first engaging portion pushes the first protruding portion to rotate the brake shoe in the second rotation direction. A braking device characterized by being made to rotate.
When the input-side rotating member rotates in the first rotation direction, the first engaging portion pushes one of the pair of movable pieces to release the braking force.
The first aspect of claim 1, wherein when the input-side rotating member rotates in the second rotation direction, the second engaging portion pushes the other of the pair of movable pieces to release the braking force. Brake device.
The input-side rotating member has a contact convex portion that faces the facing surface, projects inward in the radial direction, and can come into contact with the acting portion.
Claim 1 is characterized in that the first engaging portion, the second engaging portion, and the contact convex portion are arranged on one circumference centered on the rotation axis of the output side rotating member. Alternatively, the braking device according to claim 2.
The brake device according to claim 3, wherein the first engaging portion, the second engaging portion, and the contact convex portion are arranged along the inner circumference of the input-side rotating member.
3. The third or claim, wherein the input-side rotating member has a groove between the first engaging portion and the contact convex portion, and between the second engaging portion and the contact convex portion. Item 4. The braking device according to item 4.
According to any one of claims 3 to 5, the size of the first engaging portion and the second engaging portion in the circumferential direction is smaller than the size of the contact convex portion in the circumferential direction. The brake device described.
Claims 1 to 6 are characterized in that the working portion is arranged so as to intersect a straight line connecting the tip of the first protruding portion of each brake shoe and the tip of the second protruding portion. The brake device according to any one of the above.
Any one of claims 1 to 7, wherein the output-side rotating member has a recess on the rotation axis for accommodating a screw for attaching a lever for rotating the input-side rotating member. The braking device described in the section.
An operating member for rotating the input side rotating member and
A lever that rotates integrally with the operating member is further provided.
The operating member has an axially projecting portion that projects in the axial direction of the output side rotating member in a part of the outer peripheral portion.
The brake device according to any one of claims 1 to 7, wherein the lever has a notch that engages with the axial protrusion.
Input side rotating member and
An output-side rotating member having an output gear, which does not rotate when a torque for rotating the output-side rotating member is input from the output gear, and does not rotate when a torque for rotating the input-side rotating member is input. Is a braking device including an output-side rotating member that rotates.
The output-side rotating member is a braking device having a recess on the rotation axis for accommodating a screw for attaching a lever for rotating the input-side rotating member.
The brake shoe, the action unit, and the housing for accommodating the input side rotating member are provided.
The housing is a first bearing portion that pivotally supports the output side rotating member, and a second bearing portion that is located away from the first bearing portion in the axial direction of the output side rotating member, and is the output side. It has a second bearing that supports the rotating member, and
The first bearing portion abuts on the output side rotating member in the axial direction to regulate the movement of the output side rotating member to one side in the axial direction.
The first aspect of the present invention is characterized in that the second bearing portion abuts on the output side rotating member in the axial direction to prevent the output side rotating member from moving to the other side in the axial direction. The described braking device.
The housing is
The outer ring, a side wall portion extending radially inward from the outer ring and restricting the movement of the brake shoe to one side in the axial direction, and the first bearing portion formed on the side wall portion are integrally integrated. With the outer ring member
A first cover member having an outer ring fitting portion that fits on the outer peripheral surface of the outer ring and having a first cover portion that regulates the movement of the brake shoe to the other side in the axial direction.
The brake device according to claim 11, further comprising a second cover member fixed to the first cover portion and having the second bearing portion.
The brake device according to claim 12, wherein the inner peripheral surface of the outer ring fitting portion is welded to the outer peripheral surface of the outer ring.
The second cover member has a cover fitting portion that fits on the outer peripheral surface of the outer ring fitting portion.
The brake device according to claim 13, wherein the inner peripheral surface of the cover fitting portion is welded to the outer peripheral surface of the outer ring fitting portion.
Any of claims 12 to 14, wherein the first cover member further has a mounting flange extending radially outward from the outer ring fitting portion for mounting the brake device on another member. The brake device according to item 1.
A pair of first movable pieces arranged between each of the inner side surfaces and the facing surface, and by being sandwiched between the inner side surface and the facing surface, a braking force of the brake shoe is generated. The first movable piece to be made to
A first spring, which is arranged between the pair of first movable pieces and urges the pair of first movable pieces to separate from each other, is further provided.
Each of the brake shoes has a first protruding portion arranged at one end in the circumferential direction and protruding inward in the radial direction, and a first protruding portion arranged at the other end in the circumferential direction and protruding inward in the radial direction. Has 2 protrusions
The pair of first movable pieces are arranged between the first protrusion and the second protrusion.
The input-side rotating member has a first engaging portion arranged between the pair of first movable pieces and the first protruding portion, which protrudes in the axial direction, and the pair of protruding members in the axial direction. A second engaging portion arranged between the first movable piece and the second protruding portion is provided corresponding to each brake shoe.
When the input-side rotating member rotates in the first rotation direction, the first engaging portion pushes one of the pair of first movable pieces to release the braking force, and the second engaging portion releases the braking force. The second protruding portion is pushed to rotate the brake shoe in the first rotation direction.
When the input-side rotating member rotates in the second rotation direction opposite to the first rotation direction, the second engaging portion pushes the other of the pair of first movable pieces to release the braking force. The brake device according to any one of claims 12 to 15, wherein the first engaging portion pushes the first protruding portion to rotate the brake shoe in the second rotation direction.
An operation ring arranged on the outer side in the radial direction of the input side rotating member,
A second movable piece arranged between the inner peripheral surface of the operation ring and the outer peripheral surface of the input-side rotating member, and between the inner peripheral surface of the operating ring and the outer peripheral surface of the input-side rotating member. A plurality of second movable pieces that cause the input-side rotating member to follow the rotating operation of the operating ring by being sandwiched between the two.
A second spring that urges the adjacent second movable pieces to move away from each other is further provided.
The first cover portion regulates the movement of the second movable piece to the one side in the axial direction.
The second cover member according to any one of claims 12 to 16, wherein the second cover member has a second cover portion that restricts the movement of the second movable piece to the other side in the axial direction. The brake device described.
The second movable piece is a roller or a sphere.
The first cover member has a regulating protrusion that protrudes in the axial direction and is arranged between the plurality of second movable pieces.
The brake according to claim 17, wherein the regulating protrusion contacts the second movable piece at a position where the distance from the rotation axis of the output side rotating member is smaller than the center of the second movable piece. apparatus.
The brake device according to claim 17, wherein the first cover portion regulates the movement of the second spring to the one side in the axial direction.
The second cover member is further provided with an operating member arranged on the other side in the axial direction.
The operation ring has an operation protrusion that projects outward in the radial direction.
The operating member has a notch that engages with the operating protrusion.
The brake device according to any one of claims 17 to 19, wherein the operating member and the operating ring rotate integrally when the notch portion engages with the operating protrusion. ..