JP2014080987A - Brake device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a brake device which efficiently generates a braking force, can be downsized, and be lightweight.SOLUTION: A brake device 1 is provided with: an outer ring 10; a brake surface 23 which can contact an inner peripheral surface 11A opposite the inner peripheral surface 11A of the outer ring 10 and brake cams 20 having inner side surfaces facing inside in a radial direction; and output side rotary members 30 placed inside the respective brake cams 20. The inner side surfaces have cam surfaces 24A, 24B, and the output side rotary members 30 have projection parts 33 which project outside in the radial direction and can be in contact with the cam surfaces 24A, 24B. The projection part 33, the cam surfaces 24A, 24B, and the brake surface 23 are placed side by side in the radial direction.

Description

  The present invention relates to a brake device used for a vehicle seat height adjustment mechanism and the like.

  In the height adjustment mechanism for a vehicle seat, the output shaft rotates by operating a lever provided on the input side that swings up and down. However, the weight of the seat and the occupant applies a force to the seat to lower the seat. However, the brake device comprised so that an output shaft may not rotate is used (patent document 1).

  Such a brake device includes an outer ring having a cylindrical inner peripheral surface, a plurality of brake cams (clamping members) opposed to the inner peripheral surface, and an output side rotating member (wing) disposed inside the brake cam. And a bolt). The rotation operation input to the brake cam is transmitted from the brake cam to the operation of the output side rotation member. However, even if the output side rotation member is rotated, the output side rotation member contacts the brake cam and the brake cam is rotated. The force exerted on the brake acts mainly as a force pressing the brake cam against the outer ring, and the rotational force applied to the brake cam by the output side rotating member cannot exceed the frictional force that can be generated between the brake cam and the outer ring. The cam cannot be rotated.

  And in the brake cam of patent document 1, the brake force is generate | occur | produced because the two brake surfaces in the both ends of the circumferential direction contact | connect the inner peripheral surface of an outer ring | wheel (brake housing).

Japanese translation of PCT publication No. 2002-511035

By the way, if the brake surface of the brake cam is at both ends in the circumferential direction, the brake cam is supported at both ends like the support beams at both ends, and a force is input near the center. Therefore, when a large rotational force is applied to the output side rotation member to generate a large braking force, the output side rotation member is bent in the vicinity of the center portion to cause bending.
And the conventional brake cam had the problem that it had to enlarge the magnitude | size of a radial direction from the necessity to suppress bending, and had to be heavy and enlarged. In addition, when the radial size of the brake cam is large, the position where the output-side rotating member pushes the brake cam becomes a position relatively close to the rotation center axis of the output-side rotating member, and a large braking force is applied. It was disadvantageous for this.
Further, when the brake surfaces are at both ends in the circumferential direction of the brake cam, only four brake surfaces can be arranged in the circumferential direction for convenience of layout for generating a braking force. For this reason, there is a problem that the outer ring is easily deformed and the weight of the outer ring is increased in order to increase the rigidity of the outer ring.

  The present invention has been made in view of the above background, and an object of the present invention is to provide a brake device that can efficiently generate a braking force and can be reduced in size and weight.

  In order to achieve the above-mentioned object, the present invention includes an outer ring having a cylindrical inner peripheral surface and at least two brake cams arranged inside the outer ring, the inner peripheral surface facing the inner peripheral surface. A brake cam having a brake surface that can come into contact with the surface and an inner side surface facing radially inward, and an output-side rotating member disposed on the inner side of each brake cam, the inner side surface of the output-side rotating member The output side rotating member has a protruding portion that protrudes radially outward and can come into contact with the cam surface, and is input to the brake cam. The rotation in the first rotation direction in which the cam surface abuts on the protrusion is transmitted to the output-side rotation member, while in the second rotation direction opposite to the first rotation direction input to the output-side rotation member. The rotation is such that the brake surface Is configured not transmitted to the brake cam by being pressed against the surface, to said protrusion, said cam surface, and the braking surface is characterized in that it is arranged in the radial direction.

  According to such a configuration, since the projecting portion, the cam surface, and the brake surface are arranged side by side in the radial direction, the projecting portion causes the cam surface to have a diameter when the output-side rotating member is rotated in the second rotational direction. The force pushing outward in the direction is transmitted to the brake surface located on the radially outer side of the cam surface. Then, the braking force is generated by pressing the brake surface against the inner peripheral surface.

  At this time, since the brake cam is not supported at both ends like the support beams at both ends, the force by which the protruding portion of the output side rotating member pushes the cam surface of the brake cam does not bend and bend the brake cam. It works as a force to compress the brake cam. Therefore, high bending rigidity is not necessary for the brake cam, and the size in the radial direction can be made smaller than in the conventional case. As a result, the position where the output side rotating member abuts on the brake cam can be set far from the rotation center axis, so that the braking force can be generated efficiently.

  Furthermore, since the brake surface of the brake cam is not arranged separately at both ends in the circumferential direction, but arranged side by side on the radial direction of the cam surface, the size of the brake cam in the circumferential direction can be reduced. it can. Therefore, a large number of brake cams can be dispersed in the circumferential direction. Therefore, local deformation (bending deformation) of the outer ring is suppressed, and the force with which the outer ring is pressed radially outward from the brake surface can be evenly distributed in the circumferential direction, so that the outer ring wall thickness (diameter size) Can be suppressed, and the weight can be reduced. In addition, since the brake surface area can be increased by providing a large number of brake cams, the braking force can be generated efficiently.

  Thus, according to the brake device of the present invention, it is possible to reduce the size and weight by efficiently generating the braking force.

  In the brake device described above, the brake cam includes a first engagement portion, and the output-side rotation member is configured to cause the first engagement when a rotational force larger than a predetermined value is input in the second rotation direction. A second engagement portion that engages in the circumferential direction in the joint portion, and a predetermined amount of gap is set between the first engagement portion and the second engagement portion during non-operation; When the rotational force below the predetermined value is applied to the output-side rotating member, the rotation of the output-side rotating member is not transmitted to the brake cam, and a rotational force larger than the predetermined value is applied to the output-side rotating member. If given, the output-side rotating member and the brake cam can be configured to rotate integrally by the second engaging portion engaging the first engaging portion.

  According to such a configuration, when a rotational force larger than a predetermined value is input to the output side rotating member, it is possible to suppress deformation of the component due to a large load applied to each component.

  In the brake device described above, it is preferable that the plurality of brake cams are connected by a connecting portion.

  In this way, the brake cam is connected by the connecting portion, so that the brake cam can be attached to the outer ring at once, and the gap between the brake cams is constant, so that the brake cam is attached to the output side rotating member Will also be easier.

  When the brake cam has a connecting portion, it is desirable that the connecting portion has flexibility.

  Since the connecting portion is soft enough to have flexibility, the connecting portion does not restrain the movement of the brake cam and can efficiently generate a braking force.

  According to the configuration of the first aspect, the brake device can be reduced in size and weight by efficiently generating the braking force.

  According to the structure of Claim 2, the deformation | transformation of the components by applying a big load to each component can be suppressed.

  According to the structure of Claim 3, the assembly | attachment of a brake cam and an output side rotation member becomes easy.

  According to the structure of Claim 4, even when it has a connection part, a connection part does not restrain the motion of a brake cam, but can generate | occur | produce a braking force efficiently.

It is a disassembled perspective view of the brake device concerning one embodiment. It is sectional drawing of the brake device which concerns on one Embodiment. It is a figure explaining operation | movement of a brake device, and shows the case where a clockwise rotational force is given to the input side rotation member. It is a figure explaining operation | movement of a brake device, and shows the case where a counterclockwise rotational force is given to the output side rotation member. It is a figure explaining operation | movement when the big counterclockwise rotational force is input into the output side rotation member. It is sectional drawing of the brake device which concerns on a 1st modification. It is sectional drawing of the brake device which concerns on a 2nd modification.

  Next, embodiments of the present invention will be described in detail with reference to the drawings as appropriate. As shown in FIG. 1, the brake device 1 according to an embodiment includes an outer ring 10, a brake cam 20, an output side rotating member 30, and an input side rotating member 40.

  The outer ring 10 includes a ring portion 11 having a predetermined thickness and a side wall 12 provided on one side surface of the ring portion 11. The ring portion 11 has a cylindrical (circular cross section) inner peripheral surface 11A. A through hole 12A is formed in the side wall 12 corresponding to the central axis of the inner peripheral surface 11A.

  The brake cams 20 are members that generate a braking force between the outer ring 10 and six brake cams 20 are arranged inside the outer ring 10 at equal intervals in the circumferential direction. The brake cam 20 includes a main body portion 21 extending in a circumferential direction (in the present specification, the radial direction and the circumferential direction are based on the inner peripheral surface 11A of the outer ring 10), and both end portions of the main body portion 21. It has a first inner extending portion 22A and a second inner extending portion 22B as an example of a first engaging portion extending inward in the radial direction, and has a U-shape that is open radially inward as a whole. .

  On the side (outer peripheral side) facing the inner peripheral surface 11 </ b> A of the main body portion 21, the brake surface 23 is disposed in the central portion. The brake surface 23 is formed of a cylindrical surface having the same radius as the inner peripheral surface 11A, and comes into close contact with the inner peripheral surface 11A of the outer ring 10 when the brake cam 20 is urged radially outward. Further, on both sides of the brake surface 23 in the circumferential direction, flank surfaces 27 that are retracted radially inward with respect to the brake surface 23 and inclined with respect to the brake surface 23 are arranged.

  As shown in FIG. 2, cam surfaces 24 </ b> A and 24 </ b> B in which the distance from the rotation center 56 of the output-side rotating member 30 gradually changes are formed on the inner surface facing the radially inner side of the main body 21. . Specifically, both the cam surfaces 24A and 24B are inclined with respect to the circumferential direction so that the distance from the rotation center 56 of the output-side rotating member 30 becomes smaller as going from the center in the circumferential direction to the outside. . The outer surfaces in the circumferential direction of the first inner extending portion 22A and the second inner extending portion 22B are rotational input surfaces 25 to which rotational force is input from the input-side rotating member 40. Moreover, 22 A of 1st inner side extension parts and 22 A of 2nd inner side extension parts have the extension part inner surface 26 which faces the circumferential direction inner side. The six brake cams 20 have the same configuration.

As shown in FIG. 1, the output-side rotating member 30 is disposed inside the six brake cams 20 and includes a shaft portion 31 and an action portion 32 provided at an end portion of the shaft portion 31. ing.
The shaft portion 31 extends toward the side wall 12 of the outer ring 10, is exposed to the outside from the above-described through hole 12A, and engages with other parts. For example, a gear is provided at the distal end portion of the shaft portion 31 and is engaged with a driving force input gear of a vehicle seat height adjustment mechanism.

The action part 32 has a substantially disk shape, and as shown in FIG. 2, a projecting part 33 projecting radially outward is provided on the outer periphery thereof. The protrusion 33 is provided toward the inner surface of each brake cam 20. The protrusion 33 receives a rotational force that is counterclockwise (in this specification, “clockwise” and “counterclockwise” are based on FIG. 2) in the output-side rotating member 30 in FIG. Sometimes it can come into contact with the cam surface 24A, and can come into contact with the cam surface 24B when a clockwise rotational force is inputted.
And the protrusion part 33, 24 A of cam surfaces, and the brake surface 23 are arrange | positioned along with the radial direction. That is, they are aligned on a straight line. Similarly for the cam surface 24B, the protruding portion 33, the cam surface 24B, and the brake surface 23 are arranged side by side in the radial direction.

  As shown in FIG. 1, the input side rotation member 40 includes a disk-shaped main body 41 and six pins 42 that protrude from the main body 41 toward the side wall 12 of the outer ring 10. The pins 42 are provided at positions and thicknesses that match the gaps between the six brake cams 20, that is, the gaps between the rotation input surfaces 25 of the adjacent brake cams 20 (see FIG. 2). That is, the pins 42 are arranged around the rotation center 56 every 30 °.

  The extending portion inner side surface 26 of the brake cam 20 is sufficiently separated from the protruding portion 33 of the output side rotating member 30 in the circumferential direction. For this reason, even if a large counterclockwise or clockwise rotational force is input to the output side rotation member 30, it does not come into contact with the protrusion 33.

The operation of the brake device 1 configured as described above will be described.
As shown in FIG. 3, when a rotational force in the clockwise direction (first rotational direction in which the cam surface 24 </ b> A abuts against the protruding portion 33) is applied to the input side rotating member 40, the three pins 42 are adjacent in the clockwise direction. The rotation input surface 25 of the brake cam 20 to be urged is urged to give a rotational force to each brake cam 20. In each brake cam 20, the cam surface 24 </ b> A on each inner surface comes into contact with the protruding portion 33 of the output-side rotating member 30 to apply a clockwise rotational force to the output-side rotating member 30 (see arrows). Thereby, when the input side rotation member 40 is rotated clockwise, the input side rotation member 40, the brake cam 20, and the output side rotation member 30 are rotated together in a clockwise direction.

  As shown in FIG. 4, when the rotational force in the counterclockwise direction in the drawing (second rotation direction opposite to the first rotation direction) is given to the output side rotation member 30, each of the six protrusions 33 corresponds to each other. It abuts on the cam surface 24A of the brake cam 20 and pushes the cam surface 24A radially outward. In accordance with the force F1 pushing the cam surface 24A, the frictional force F2 acting at the contact point acts to slightly rotate the brake cam 20 counterclockwise.

  Further, the force F <b> 1 generates a force F <b> 3 that presses the brake cam 20 against the inner peripheral surface 11 </ b> A of the outer ring 10 at the brake surface 23. Then, in accordance with this force F3, a frictional force F4 that resists the force to rotate the brake cam 20 counterclockwise acts between the inner peripheral surface 11A and the brake surface 23. In the brake device 1 of the present embodiment, the force for rotating the brake cam 20 by the frictional force F2 counterclockwise cannot exceed the frictional force F4. Therefore, the output-side rotating member 30, the brake cam 20, and The input side rotation member 40 cannot rotate with respect to the outer ring 10. That is, the counterclockwise rotation input to the output side rotation member 30 is not transmitted to the brake cam 20 because the brake surface 23 is pressed against the inner peripheral surface 11A. In this way, the brake device 1 can generate a braking force.

  In the present embodiment, the cam surface 24B is also arranged so as to be able to contact the protruding portion 33. Therefore, when the input-side rotating member 40 is rotated counterclockwise, the force application direction and the rotation direction are determined. Inverted, the input side rotating member 40, the brake cam 20 and the output side rotating member 30 are integrally rotated counterclockwise. In this case, the counterclockwise direction is the first rotation direction in which the cam surface 24B comes into contact with the protrusion 33. On the other hand, when trying to rotate the output side rotating member 30 clockwise, the method of applying force is reversed and acts in the same manner as in the clockwise direction, and the output side rotating member 30, the brake cam 20 and the input side are operated. The rotating member 40 cannot rotate with respect to the outer ring 10. That is, the brake device 1 can generate a braking force. In this case, the clockwise direction is the second rotation direction opposite to the first rotation direction.

When a rotational force greater than a predetermined value counterclockwise is applied to the output side rotation member 30, the contact pressure between the brake surface 23 and the inner peripheral surface 11A is not uniform as shown in FIG. The pressure is biased to Thus, if the contact pressure between the brake surface 23 and the inner peripheral surface 11A is not uniform, the adhesion between the brake surface 23 and the inner peripheral surface 11A deteriorates, and the frictional force F4 cannot be generated efficiently. When the rotational force input from the rotating member 30 to the brake cam 20 exceeds the frictional force F4, the brake cam 20 rotates. Similarly, when a rotational force greater than a predetermined value in the clockwise direction is applied to the output side rotation member 30, the brake cam 20 rotates in the clockwise direction.
As described above, when a rotational force larger than a predetermined value is input to the output-side rotating member 30, the output-side rotating member 30, the brake cam 20, and the input-side rotating member 40 rotate as a unit. Deformation of parts can be suppressed.

  The magnitude of the rotational force at which the brake cam 20 starts to rotate by inputting a large rotational force to the output-side rotating member 30 can be adjusted by the magnitude of the brake surface 23 in the circumferential direction. Briefly, the larger the circumferential size of the brake surface 23 is, the larger the rotational force at which the brake cam 20 starts to rotate, and the smaller the circumferential size is, the smaller the rotational force at which the brake cam 20 starts to rotate. Specifically, as shown in FIG. 5, when the output side rotation member 30 is to be rotated counterclockwise, if the brake surface 23 extends long in the counterclockwise direction, the brake surface 23 and the inner periphery Since the contact pressure on the surface 11A is less likely to be biased, the rotational force at which the brake cam 20 starts to rotate can be increased. Conversely, when the brake surface 23 extends only slightly in the counterclockwise direction, the brake surface 23 and the inner peripheral surface 11A can be simply rotated by turning the output side rotation member 30 counterclockwise with a small rotational force. The brake cam 20 rotates with the contact pressure biased. That is, the rotational force at which the brake cam 20 starts to rotate can be reduced.

  As described above, according to the brake device 1 of the present embodiment, when the input side rotation member 40 is to be rotated clockwise or counterclockwise, the cam surface 24A or the cam surface 24B of the brake cam 20 is rotated on the output side. The protrusion 33 of the member 30 can be pushed to rotate the output side rotation member 30. On the other hand, when the output side rotation member 30 is to be rotated clockwise or counterclockwise, the brake surface 23 is pressed against the inner peripheral surface 11A of the outer ring 10 by the protrusion 33 pressing the cam surface 24A or the cam surface 24B. Therefore, brake force is generated and the brake cam 20 cannot rotate.

  And since the protrusion part 33, cam surface 24A, 24B, and the brake surface 23 are arrange | positioned along with radial direction, the force which the protrusion part 33 presses the brake cam 20 when generating a braking force is the brake cam 20 Is merely compressed between the brake surface 23 and the cam surfaces 24A and 24B and does not work to bend, so that it is not necessary to increase the bending rigidity of the brake cam 20. Therefore, since the size of the brake cam 20 in the radial direction (the thickness in the radial direction of the main body portion 21) can be reduced, the size and weight of the brake cam 20 can be reduced.

  Also, by reducing the size of the brake cam 20 in the radial direction, the distance from the rotation center 56 of the portion where the projecting portion 33 contacts the cam surfaces 24A and 24B (referred to as the working radius D1, see FIG. 3). Can be increased. When the brake cam 20 attempts to keep the surface pressure received from the protrusions 33 on the cam surfaces 24A and 24B within a predetermined upper limit value, the brake force for stopping the output-side rotating member 30 has an action radius D1. The larger it is, the larger it can be. Therefore, the brake device 1 according to the present embodiment can efficiently generate the braking force while suppressing the surface pressure of the cam surfaces 24A and 24B and increasing the durability of the brake cam 20.

  Furthermore, in the brake device 1 of the present embodiment, the brake surfaces 23 are not arranged at both ends in the circumferential direction of the brake cam 20 but are arranged side by side radially outward with respect to the cam surfaces 24A and 24B. The size of the brake cam 20 in the circumferential direction can be reduced. For this reason, conventionally, only two brake cams are arranged side by side in the circumferential direction, but in the brake device 1, six brake cams can be arranged in the circumferential direction. That is, since the total area of the brake surface 23 can be increased by increasing the number of brake cams 20, the braking force can be efficiently generated in this respect.

  Further, increasing the number of the brake surfaces 23 arranged in the circumferential direction is also advantageous for the outer ring 10. Conventionally, two brake cams are arranged in the circumferential direction and four brake surfaces are arranged, but in this embodiment, six brake surfaces 23 are arranged in the circumferential direction. When there are few places where the brake surface comes into contact with the outer ring, the outer ring 10 is subjected to a large force locally at the contact place. Try to get closer to. However, when the brake surface 23 comes into contact with the outer ring 10 at six locations as in the present embodiment, the force applied to each contact location is reduced and the force is dispersed, and the outer ring 10 is less deformed from a circle. Therefore, it is not necessary to increase the bending rigidity of the outer ring 10. That is, the bending force does not act much on the outer ring 10 and it is mainly pulled in the circumferential direction, so that the size (thickness) in the radial direction of the outer ring 10 is reduced and the brake device 1 is downsized. It is possible to reduce the weight.

  Although one embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment. About a concrete structure, it can change suitably in the range which does not deviate from the meaning of this invention.

  For example, in the above embodiment, the braking force is generated regardless of whether the output side rotating member 30 is rotated clockwise or counterclockwise. However, the braking force is generated only in one rotating direction. It can also be configured to generate. In addition, another configuration may be adopted as a configuration that allows the brake cam 20 to rotate when a rotational force larger than a predetermined value is input to the output side rotation member 30.

  The brake device 100 of FIG. 6 shows an example of this modified example. By changing the positions of the extension inner surfaces 126A and 126B, the first inner extension 122A and the second extension can be changed. The size of the inner extension 122B in the circumferential direction is changed. Of the extending portion inner surfaces 126A and 126B, the extending portion inner side surface 126B on the clockwise side is disposed at a position where the protruding portion 33 can be contacted at any time, and the extending portion inner side surface 126A on the counterclockwise direction is disposed on the output side rotating member 30. Only when a rotational force greater than a predetermined value in the counterclockwise direction (second rotational direction) is applied, the protrusion 33 is disposed at a position where it can come into contact. That is, when a rotational force equal to or smaller than a predetermined value is applied to the output-side rotating member 30, the rotation of the output-side rotating member 30 is not transmitted to the brake cam 120, and a rotational force larger than the predetermined value is output. In this case, the output side rotating member 30 and the brake cam are integrated with each other by engaging the protrusion 33 (second engaging portion) with the first inner extending portion 122A (first engaging portion). A predetermined amount of gap D2 between the first inner extending portion 122A and the protruding portion 33 is set so as to rotate in the non-operating state. The inner side surface 124B is parallel to the brake surface 23.

According to such a configuration, when a clockwise rotational force is applied to the output-side rotating member 30, the projecting portion 33 is engaged with the extending portion inner surface 126B on the clockwise direction side in the circumferential direction and pressed. The brake cam 120 is rotated clockwise.
On the other hand, when a rotational force in the counterclockwise direction is applied to the output-side rotation member 30, if the rotational force is equal to or less than a predetermined value, the protruding portion 33 does not come into contact with the extension portion inner surface 126A on the counterclockwise side. As in the above-described embodiment, the brake cam 120 does not rotate. However, when the rotational force applied to the output-side rotating member 30 is greater than a predetermined value, the gap D2 is clogged, and the projecting portion 33 comes into contact with the extending portion inner surface 126A, whereby the brake cam 120 rotates. Thereby, even if a large rotational force is input to the output-side rotating member 30, deformation of each component can be suppressed.

In the above embodiment, six brake cams 20 are provided side by side in the circumferential direction, but a larger number of brake cams 20 can be provided as in the brake device 200 shown in FIG. The brake device 200 eliminates the flank 27, the first inner extending portion 22A, and the second inner extending portion 22B in the above-described embodiment, and makes one brake cam 220A smaller in the circumferential direction. Twelve are arranged in the direction. Each brake cam 220A is provided with cam surfaces 224A and 224B similar to the cam surfaces 24A and 24B of the above embodiment. The output-side rotating member 230 is formed with a protrusion 233 corresponding to each brake cam 220A, and each protrusion 233 can come into contact with the cam surfaces 224A and 224B inside each brake cam 220A. Has been placed.
Thus, the braking force can be efficiently generated by increasing the number of brake cams 220A and increasing the total area of the brake surface 223.

  If the number of the brake cams 220A is large, the combination of the outer ring 10, the output-side rotating member 230, and the input-side rotating member 240 becomes complicated, so the adjacent brake cams 220A are connected to each other by the connecting portion 220B. A brake cam set 220 is configured. Here, as an example, the connecting portion 220B is formed integrally with the brake cam 220A. However, the connecting portion 220B may be formed separately from the brake cam 220A and combined with the brake cam 220A. . By connecting the brake cam 220A by the connecting portion 220B, the gap between the brake cams 220A is kept constant, and it becomes easy to combine the output-side rotating member 230 and the input-side rotating member 240 with the brake cam 220A.

  Here, it is desirable that the connecting portion 220B has flexibility. Since the connecting portion 220B is soft enough to have flexibility, the connecting portion 220B does not restrain the movement of each brake cam 220A and can efficiently generate a braking force.

  Each brake cam 220 </ b> A has a groove 225 formed on an end face in the circumferential direction. On the other hand, the input side rotation member 240 is formed of a sheet metal and has an engaging portion 242 disposed between the brake cams 220A. The engaging portion 242 is engaged with the groove 225 of the brake cam 220A. As described above, the brake cam 220A has the groove 225, and the engaging portion 242 enters the groove 225, thereby increasing the size of the brake surface 223 and reducing the surface pressure applied to the brake surface 223. it can.

Hereinafter, another modification of the present invention will be described.
In the embodiment, six brake cams 20 are provided side by side in the circumferential direction, but at least two brake cams 20 may be provided in the circumferential direction.

  In the above embodiment, the output side rotation member 30 has the shaft portion 31 and the action portion 32 formed integrally, but these may be divided into a plurality of parts.

  In the embodiment and each modification, the brake cams are arranged at regular intervals in the circumferential direction. However, the brake cams are not necessarily arranged at regular intervals. However, the brake cams are arranged at equal intervals in the circumferential direction, so that the position of the output side rotation member can be stabilized.

DESCRIPTION OF SYMBOLS 1 Brake apparatus 10 Outer ring 11 Ring part 11A Inner peripheral surface 20 Brake cam 21 Main body part 22A 1st inner side extension part 22B 2nd inner side extension part 23 Brake surface 24A, 24B Cam surface 25 Rotation input surface 26 Extension part inner side surface 30 Output side rotating member 33 Protruding part 40 Input side rotating member 41 Main body part 42 Pin 56 Center of rotation

Claims (4)

An outer ring having a cylindrical inner peripheral surface;
And at least two brake cams arranged on the inner side of the outer ring, the brake cam having a brake surface that can be in contact with the inner peripheral surface and facing the inner peripheral surface, and an inner surface that faces radially inward,
An output side rotation member disposed inside each brake cam,
The inner side surface has a cam surface whose distance from the rotation center of the output side rotation member gradually changes,
The output-side rotating member has a protruding portion that protrudes radially outward and can come into contact with the cam surface,
The rotation in the first rotation direction in which the cam surface input to the brake cam abuts on the protrusion is transmitted to the output-side rotation member, while the first rotation direction input to the output-side rotation member The rotation in the reverse second rotation direction is configured not to be transmitted to the brake cam by the brake surface being pressed against the inner peripheral surface,
The brake device, wherein the protrusion, the cam surface, and the brake surface are arranged side by side in a radial direction. The brake cam has a first engagement portion,
The output-side rotation member has a second engagement portion that engages with the first engagement portion in the circumferential direction when a rotational force larger than a predetermined value is input in the second rotation direction,
When a predetermined amount of gap is set between the first engaging portion and the second engaging portion during non-operation, a rotational force equal to or less than the predetermined value is applied to the output-side rotating member. In this case, the rotation of the output-side rotating member is not transmitted to the brake cam, and when the rotational force larger than the predetermined value is applied to the output-side rotating member, the second engaging portion is the first engaging member. 2. The brake device according to claim 1, wherein the output side rotation member and the brake cam rotate integrally by engaging with a joint portion.   The brake device according to claim 1, wherein the plurality of brake cams are connected by a connecting portion.   The brake device according to claim 3, wherein the connecting portion has flexibility.

Images