TWI730249B - Braking device - Google Patents

Abstract

The present invention provides a braking device that can be used universally. The brake device includes: a bracket that can be mounted on the bicycle frame; a brake drum rotatably provided on the bracket; a friction member that can be provided in contact with the brake drum; and the friction member is in contact with the brake drum The brake action mechanism is constituted; the brake drum includes: a brake member that can be in contact with the friction member; a connecting member connected to the hub provided on the bicycle frame; and the brake drum is generated between the brake member and the connecting member The relative rotational force of, allows the relative rotation of the braking member and the connecting member, a clutch mechanism that connects the braking member and the connecting member.

Description

Braking device

The present invention relates to a braking device.

For example, a brake device used for a bicycle is known from Patent Document 1. The brake device is connected to the hub via a clutch mechanism. The clutch mechanism includes a first part provided in the braking device and a second part provided in the hub. The brake device and the wheel hub are connected through the first part and the second part in a manner of relative rotation according to the relative rotational force generated between the brake device and the wheel hub.

[Prior Technical Literature]

[Patent Literature]

[Patent Document 1] JP 2007-62718 A

In the above braking device, the clutch mechanism can only be applied to a dedicated hub that can accommodate the clutch mechanism.

The object of the present invention is to provide a brake device that can be used universally.

The brake device of the first aspect of the present invention includes: a bracket that can be mounted on the bicycle frame; a brake drum that is rotatably provided on the bracket; and a friction member that can be contacted with the brake drum And a brake action mechanism, which is constructed in such a way that the friction member is in contact with the brake drum; the brake drum includes: a brake member, which can be in contact with the friction member; a connecting member, which is set in the aforementioned A wheel hub connection on a bicycle frame; and a clutch mechanism that connects the brake member and the brake member in a manner that allows the relative rotation of the brake member and the connection member in accordance with the relative rotational force generated between the brake member and the connecting member The aforementioned connecting member.

When the brake device of the aforementioned first form is adopted, since the clutch mechanism is provided in the brake device, it can be applied to a general-purpose wheel hub. In addition, because the size of the clutch mechanism is not limited by the size of the hub, a clutch mechanism with a desired capacity can be realized.

The second form is the brake device of the aforementioned first form, wherein the clutch mechanism includes: a first member, which is non-rotatably provided on the aforementioned braking member; a second member, which is non-rotatably provided on the aforementioned connecting member; And a force applying member, which forces the first member and the second member to face each other.

When the brake device of the second form described above is used, the force acting between the first member and the second member can be controlled by the urging member, and the clutch mechanism of the desired capacity can be easily realized.

The third aspect is the same as the braking device of the second aspect, wherein the first member is provided on the inner periphery of the braking member.

When the brake device of the aforementioned third form is used, the internal space of the brake member can be effectively used.

The fourth aspect is the brake device of the foregoing third aspect, which further includes a support member, which is provided on the inner periphery of the braking member, and the outer periphery of the support member and the inner periphery of the braking member are splined. Closely, the inner peripheral portion of the support member is spline-fitted with the first member.

When the brake device of the aforementioned fourth form is adopted, an assembly of the first member and the supporting member is formed by spline fitting, and by installing the assembly on the brake member, the first member can be installed It is simply installed on the inner periphery of the braking member.

The fifth aspect is the braking device of any one of the foregoing second to fourth aspects, wherein the second member is provided on the outer periphery of the connecting member.

When the brake device of the aforementioned fifth form is used, the second member can be easily attached to the connecting member.

The sixth form is the same as the brake device of the fifth form, in which the inner peripheral portion of the second member and the outer peripheral portion of the connecting member are spline-fitted.

When the brake device of the aforementioned sixth form is adopted, the second member can be reliably and stably attached to the connecting member by spline fitting.

The seventh aspect is the brake device of any one of the foregoing second to sixth aspects, wherein the clutch mechanism includes a plurality of the foregoing first members and a plurality of the foregoing second members.

When the aforementioned seventh form of braking device is adopted, the capacity of the clutch mechanism can be increased by increasing the number of the first member and the number of the second member by the clutch mechanism.

The eighth aspect is the braking device of any of the foregoing second to seventh aspects, wherein at least one of the first member and the second member faces the other of the first member and the second member The surface has at least one recess.

When the brake device of the aforementioned eighth form is adopted, the lubricating oil can be retained in the recessed portion.

The ninth aspect is the same as the aforementioned eighth aspect of the braking device, wherein the aforementioned recess is a through hole.

When the aforementioned ninth form of braking device is used, the volume of the recess can be increased.

The tenth aspect is the same as the aforementioned eighth or ninth aspect of the braking device, wherein the aforementioned recessed portion is formed in the aforementioned first member.

When the aforementioned tenth form of the brake device is used, the weight can be reduced to form the first member.

The eleventh aspect is the braking device of any one of the second to tenth aspects, wherein the urging member is arranged in the direction of the rotation axis of the brake drum in relation to the first member and the second member. The opposite side of the hub.

When the brake device of the aforementioned eleventh form is used, the urging member can be suppressed in the direction of the rotation axis of the brake drum and the clutch mechanism can be exposed on the side of the hub.

The twelfth aspect is the brake device of any of the foregoing second to eleventh aspects, wherein at least one of the brake member and the connecting member has a receiving portion, which is passed through the first member and the second member Withstand the applied force of the aforementioned force applying member.

When the brake device of the aforementioned twelfth form is adopted, the force can be appropriately applied between the first member and the second member by the receiving portion.

The thirteenth aspect is the same as the aforementioned twelfth aspect of the braking device, wherein the receiving portion is provided on the connecting member.

When the aforementioned thirteenth form of braking device is used, the structure of the braking member can be simplified.

The fourteenth aspect is the brake device of any one of the foregoing second to thirteenth aspects, and further includes an adjustment mechanism that adjusts the force applied by the force applying member to the first member and the second member.

When the aforementioned fourteenth form of braking device is used, since the force acting between the first member and the second member can be adjusted, the capacity of the clutch mechanism can be adjusted arbitrarily.

The fifteenth aspect is the same as the fourteenth aspect of the brake device, wherein the adjustment mechanism has a second threaded portion that is screwed into the first threaded portion provided on at least one of the brake member and the connecting member, and The adjusting mechanism adjusts the applied force of the force applying member by the screwing amount of the second threaded part to the first threaded part.

When the aforementioned fifteenth form of the brake device is used, the application force of the urging member can be easily adjusted by the first threaded portion and the second threaded portion, and the capacity of the clutch mechanism can be easily adjusted.

The sixteenth aspect is the brake device of any one of the first to fifteenth aspects, and further includes a sealing member for preventing foreign matter from entering the clutch mechanism.

When the aforementioned sixteenth aspect of the brake device is used, the sealing member can appropriately suppress the intrusion of foreign matter into the clutch mechanism.

The seventeenth aspect is the same as the aforementioned sixteenth aspect of the braking device, wherein the sealing member is arranged between the braking member and the connecting member.

When the aforementioned seventeenth aspect of the brake device is used, it is possible to suppress the entry of foreign matter from the gap between the brake member and the connecting member.

The eighteenth aspect is the brake device of any one of the foregoing first to seventeenth aspects, wherein the connecting member is spline-fitted with the hub.

In the case of the aforementioned eighteenth aspect of the brake device, by the spline fitting, the connecting member and the hub can be reliably and stably rotated integrally.

The nineteenth aspect is the braking device of any one of the first to eighteenth aspects, wherein the braking member has a friction surface on the inner periphery, and the friction member is arranged in contact with the friction surface of the braking member .

When the brake device of the aforementioned nineteenth form is adopted, since the friction member can be arranged inside the brake member, the internal space of the brake member can be effectively used.

The twentieth form is the same as the brake device of any one of the first to nineteenth forms, wherein the bicycle frame is provided with a front fork, and the bracket can be mounted on the front fork.

When using the aforementioned twentieth form of the brake device, it can be universally installed in the hub of the front fork.

The braking device of the present invention can be used universally.

10‧‧‧Brake device

12‧‧‧Bracket

14‧‧‧Brake drum

16‧‧‧Friction member

18‧‧‧Brake action mechanism

20‧‧‧Supporting member

22‧‧‧Adjustment mechanism

22A‧‧‧Second thread

23‧‧‧Nut

24‧‧‧Sealing components

26‧‧‧Brake component

26A‧‧‧Friction surface

26B‧‧‧Inner periphery

28‧‧‧Connecting member

28A‧‧‧Flange

28B‧‧‧Spline

28C‧‧‧ditch

29‧‧‧Sealing components

30‧‧‧Clutch mechanism

32‧‧‧Cooling plate

34‧‧‧Cover

36‧‧‧Rotating body

38‧‧‧Cam member

38A‧‧‧Recess

38B‧‧‧Cam surface

40‧‧‧rotating body

42‧‧‧Retainer

44‧‧‧First member

46‧‧‧Second member

48‧‧‧Forcing member

50‧‧‧Concave

52‧‧‧Receiving Department

54‧‧‧First thread

C‧‧‧Mechanical control cable

C1‧‧‧Internal cable

C2‧‧‧External cable

D‧‧‧radial direction

F‧‧‧Bicycle Frame

FA‧‧‧Fork

H‧‧‧wheel

H1‧‧‧Wheel Hub Shaft

H2‧‧‧Hub tube

S‧‧‧week direction

X‧‧‧Rotation axis direction

The first figure is a front view of the front fork and the wheel hub with the brake device of the embodiment installed.

The second figure is a perspective view of the brake device of the first figure viewed from the outside of the hub.

The third figure is a perspective view of the brake device of the first figure viewed from the side of the wheel hub.

The fourth figure is a cross-sectional view along the line IV-IV of the second figure.

The fifth figure is a cross-sectional view along the line V-V of the fourth figure.

The sixth figure is an exploded perspective view of the clutch mechanism and the vicinity of the clutch mechanism in the fourth figure.

The seventh figure is a perspective view of the braking member viewed from the side opposite to that of the sixth figure.

The eighth figure is a perspective view of the connecting member viewed from the side opposite to that of the sixth figure.

(Implementation form)

The brake device 10 provided on the bicycle frame F will be described with reference to the first figure. The brake device 10 is mounted on the bicycle frame F and the wheel hub H of the bicycle. The brake device 10 is a so-called roller brake device. The bicycle frame F has a front fork FA. The hub H is provided on the bicycle frame F. And the hub H is provided on the front fork FA. The hub H includes a hub shaft H1 and a hub tube H2 that is rotatably supported by the hub shaft H1 with respect to the hub shaft H1. The front fork FA is attached to both ends of the hub H in the axial direction.

As shown in the second figure, the brake device 10 includes a bracket 12, a brake drum 14, a friction member 16 (refer to the fourth figure), and a brake operation mechanism 18 (refer to the fourth figure). In addition, as shown in FIG. 4, the brake device 10 further includes a support member 20, an adjustment mechanism 22, and a sealing member 24.

As shown in the first figure, the bracket 12 can be mounted on the bicycle frame F. The bracket 12 is configured to be attachable to the front fork FA. The bracket 12 is provided with a guide portion 12A that guides the mechanical control cable C for operating the brake device 10. The mechanical control cable C includes: an inner cable C1 and an outer cable C2. The end of the outer cable C2 is installed in the guide 12A.

As shown in the third and fourth figures, the brake drum 14 is rotatably installed on the bracket 12. As shown in the fourth figure, the brake drum 14 includes a brake member 26 that can be in contact with the friction member 16, a connecting member 28 connected to the hub H, and a clutch mechanism 30. The brake drum 14 further includes a cooling disc 32 provided on the outer periphery of the brake member 26. The cooling disc 32 is configured to rotate integrally with the braking member 26 by press-fitting, caulking, spline fitting, and a combination of these. The brake drum 14 is installed on the cover 34 of the bracket 12 to partially cover the end on the opposite side to the hub H in the direction X of the rotation axis of the brake drum 14. The rotation axis direction X of the brake drum 14 is the direction of the rotation axis of the hub H.

The braking member 26 has a cylindrical shape. The connecting member 28 has a cylindrical shape. At least a part of the connecting member 28 is arranged inside the braking member 26. The connecting member 28 has a flange portion 28A at the end of the hub H in the rotation axis direction X. The connecting member 28 and the hub H are spline-fitted. Specifically, a spline portion 28B is provided in the inner peripheral portion of the connecting member 28. The spline portion 28B is spline-fitted with a plurality of convex portions provided on the outer peripheral portion of the hub tube H2, whereby the connecting member 28 and the hub H are connected rotatably as a unit. In addition, as long as the hub H and the connecting member 28 are connected so as to be integrally rotatable, a structure other than spline fitting may be adopted. In the inner peripheral portion of the connecting member 28, a groove 28C is formed at a portion closer to the hub H in the rotation axis direction X than the spline portion 28B. A sealing member 29 is provided in the groove 28C. The sealing member 29 is provided in a groove 28C contactable with the outer periphery of the hub tube H2.

At least a part of the brake operating mechanism 18 is inside the brake member 26 and is arranged on the opposite side of the connecting member 28 to the hub H in the rotation axis direction X. The brake member 26 has a friction surface 26A on the inner periphery. The friction surface 26A is formed in the inner peripheral portion of the brake member 26 that faces the brake operating mechanism 18. As shown in FIG. 7, a plurality of grooves extending in the circumferential direction S of the brake drum 14 are formed on the friction surface 26A. Thereby, the friction member 16 and the friction surface 26A can be brought into linear contact at a plurality of places.

As shown in the fourth and fifth figures, the brake operation mechanism 18 is configured to make the friction member 16 contact the brake drum 14. This is the so-called roller brake action mechanism. The brake operation mechanism 18 includes a rotating body 36, a cam member 38, a plurality of rotating bodies (rollers) 40, and a holder 42. The rotating body 36 is rotatably mounted on the bracket 12 to the bracket 12. The rotating body 36 is provided with a cable fixing portion 36A (refer to the second figure) for fixing the end of the inner cable C1.

The cam member 38 is connected to the rotating body 36 so as to be rotatable integrally with the rotating body 36. As shown in the fifth figure, the cam member 38 has a disc shape. The cam member 38 includes a plurality of recesses 38A provided in the outer peripheral portion, and a cam surface 38B provided between two adjacent recesses 38A. The cam surface 38B is provided to expand outward in the radial direction D of the brake drum 14 as it moves to one of the circumferential direction S of the brake drum 14 (clockwise in the fifth figure). In the non-braking state, the rotating bodies 40 are respectively arranged on the outer circumference of the rotating body 36 at positions corresponding to the recesses 38A. The holder 42 rotatably holds a plurality of rotating bodies 40, respectively. In addition, the holder 42 holds a plurality of rotating bodies 40 movably in the radial direction D, respectively. A plurality of friction members 16 are arranged in the radial direction D and outside the plurality of rotating bodies 40. In this embodiment, the brake operation mechanism 18 includes three friction members 16 and six rotating bodies 40. In addition, in this embodiment, one friction member 16 is arranged for two rotating bodies 40. Therefore, the friction member 16 can be provided in contact with a plurality of (two in this case) rotating bodies 40.

The friction member 16 is a brake shoe (Brake-shoe), and the friction member 16 is arranged to be in contact with the brake drum 14. The friction member 16 is arranged so as to be in contact with the friction surface 26A of the brake member 26. Specifically, the friction surface 26A of the brake drum 14 is arranged on the outer side of the plurality of friction members 16 in the radial direction D. In accordance with the operation of the operating device (brake lever) not shown, the rotating body 36 is rotated by pulling the inner cable C1, and the cam member 38 is rotated. With the cam member 38 moving the rotating body 40 in the other side of the circumferential direction S (counterclockwise in the fifth figure), the cam surface 38B of the cam member 38 pushes the rotating body 40 upward in the radial direction D and outward, and rotates The body 40 presses the friction member 16 against the friction surface 26A of the brake member 26. The heat generated between the friction member 16 and the friction surface 26A is released to the outside of the brake device 10 by the cooling disc 32.

As shown in the fourth and sixth figures, the clutch mechanism 30 connects the brake member 26 and the connecting member in a manner that allows the brake member 26 and the connecting member 28 to rotate relative to each other according to the relative rotational force generated between the brake member 26 and the connecting member 28 Component 28. The clutch mechanism 30 is provided between the inner peripheral portion of the braking member 26 and the outer peripheral portion of the connecting member 28. The clutch mechanism 30 is arranged in the rotation axis direction X, and is closer to one side of the hub H than the brake operating mechanism 18.

The clutch mechanism 30 includes: a first member 44 that is non-rotatably provided on the braking member 26; a second member 46 that is non-rotatably provided on the connecting member 28; and a device for urging the first member 44 and the second member 46 to oppose each other施力机构48。 Force member 48. The clutch mechanism 30 includes a plurality of first members 44 and a plurality of second members 46. In this embodiment, the clutch mechanism 30 includes three first members 44 and three second members 46. The number of the first members 44 and the number of the second members 46 are preferably equal. The first member 44 has a disc shape. The second member 46 has a disc shape. The first member 44 and the second member 46 overlap alternately.

The first member 44 is provided on the inner periphery of the braking member 26. Specifically, the first member 44 is provided on the inner peripheral portion of the brake member 26 via the support member 20 provided on the inner peripheral portion 26B of the brake member 26. The outer peripheral portion of the support member 20 and the inner peripheral portion 26B of the brake member 26 are spline-fitted. The inner peripheral portion of the support member 20 and the first member 44 are spline-fitted.

The second member 46 is provided on the outer periphery of the connecting member 28. The inner peripheral portion of the second member 46 and the outer peripheral portion of the connecting member 28 are spline-fitted.

At least one of the first member 44 and the second member 46 has at least one recess 50 on the surface facing the other of the first member 44 and the second member 46. The recess 50 is formed in the first member 44. The recess 50 is a through hole. In one first member 44, a plurality of recesses 50 are provided around the circumferential direction S. The plurality of first members 44 are supported by the support member 20 such that the phases of the plurality of recesses 50 of each first member 44 coincide around the circumferential direction S. In other words, the plurality of first members 44 are supported by the support member 20 such that the plurality of recesses 50 are aligned in the rotation axis direction X. Lubricating oil is retained in the recess 50. The lubricating oil moves inside the recess 50 and between the first member 44 and the second member 46.

The urging member 48 is arranged on the opposite side of the hub H to the first member 44 and the second member 46 in the rotation axis direction X. The urging member 48 is, for example, a disc spring. At least one of the braking member 26 and the connecting member 28 has a receiving portion 52 that receives the urging force of the urging member 48 via the first member 44 and the second member 46. As shown in the eighth figure, the receiving portion 52 is provided on the connecting member 28. As shown in the fourth figure, the receiving portion 52 is provided on the flange portion 28A of the connecting member 28. The plurality of first members 44 and the plurality of second members 46 are sandwiched between the urging member 48 and the receiving portion 52.

The adjustment mechanism 22 adjusts the force applied by the urging member 48 to the first member 44 and the second member 46. The adjustment mechanism 22 has a second threaded portion 22A screwed into a first threaded portion 54 provided on at least one of the braking member 26 and the connecting member 28. As shown in the eighth figure, the first screw portion 54 is provided at the end portion of the connecting member 28 on the opposite side of the receiving portion 52 in the rotation axis direction X. The second screw portion 22A is provided on a nut 23 different from the connecting member 28. The adjustment mechanism 22 adjusts the urging force of the urging member 48 by the screwing amount of the second threaded portion 22A to the first threaded portion 54. Because the larger the screwing amount of the second threaded portion 22A into the first threaded portion 54 is, the greater the frictional force between the first member 44 and the second member 46 is, so the relative movement of the first member 44 and the second member 46 is difficult. That is, the capacity of the clutch mechanism 30 becomes larger. The clutch mechanism 30 switches between the relative rotational force generated between the braking member 26 and the connecting member 28 and the frictional force between the first member 44 and the second member 46 to switch between allowing the braking member 26 and the connecting member 28 to rotate relative to each other. The first state, and the second state that allows relative rotation. The greater the frictional force between the first member 44 and the second member 46, the less likely it is for the clutch mechanism 30 to switch from the first state to the second state.

As shown in the fourth figure, a sealing member 24 is provided in order to suppress the intrusion of foreign matter into the clutch mechanism 30. The sealing member 24 is arranged between the braking member 26 and the connecting member 28. One example is that the sealing member 24 is an O-ring. The sealing member 24 is arranged between the outer peripheral portion of the flange portion 28A in the connecting member 28 and the inner peripheral portion of the braking member 26.

The combination method of the braking device 10 is explained.

The first step is to insert the first member 44 and the second member 46 alternately on the outer periphery of the connecting member 28 from the side of the first threaded portion 54 toward the receiving portion 52. The inner peripheral portion of the second member 46 and the outer peripheral portion of the connecting member 28 are spline-fitted. In the second step, the support member 20 is fitted on the outer periphery of the first member 44, and the outer periphery of the first member 44 and the inner periphery of the support member 20 are spline-fitted. The third step is to insert the urging member 48 from the side of the first threaded portion 54 on the outer periphery of the connecting member 28, and then screw the second threaded portion 22A of the nut 23 into the first threaded portion 54 of the connecting member 28. The first assembly.

In the fourth step, the first assembly formed by the first to third steps is inserted into the inner peripheral portion of the brake member 26. At this time, the sealing member 24 is arranged on the inner periphery of the braking member 26 or the outer periphery of the connecting member 28. By inserting the first assembly into the inner circumference of the brake member 26, the outer circumference of the support member 20 and the inner circumference of the brake member 26 are spline-fitted.

The fifth step is to arrange the friction member 16 and the brake action mechanism 18 inside the brake member 26. The sixth step is to install the cooling disc 32 on the outer periphery of the brake member 26. The seventh step is to attach the bracket 12 and the protective cover 34 to the brake operating mechanism 18. The sixth step can also be performed earlier than the fifth step.

(Modification)

Regarding the description of the above-mentioned embodiment, the form of the brake device according to the present invention is used as an example, and the form is not limited. According to the braking device of the present invention, it is possible to adopt, for example, the following modifications of the above-mentioned embodiment, and combinations of at least two modifications that are not inconsistent with each other. In the following modification examples, the same reference numerals as in the embodiment are given to the parts that are common to the embodiment, and the description thereof is omitted.

‧The braking member 26 may also have a receiving portion 52. At this time, the brake member 26 has a convex portion protruding toward the inside in the radial direction, and the receiving portion 52 is provided in the convex portion.

‧The first threaded part 54 can also be provided on the braking member 26. For example, a first threaded portion 54 is provided on the inner periphery of the brake member 26. At this time, a second threaded portion 22A is provided on the outer periphery of the adjustment mechanism 22.

‧The urging member 48 can also be arranged in the direction X of the rotation axis of the brake drum 14, and the clutch mechanism 30 can be arranged on the side of the hub H. At this time, the receiving portion 52 is preferably arranged on the side opposite to the hub H for the clutch mechanism 30 in the direction X of the rotation axis of the brake drum 14.

‧The invention can also be applied to braking devices other than roller braking devices. For example, the present invention can also be applied to drum-type band break devices and drum-type shoe brake devices.

10‧‧‧Brake device

12‧‧‧Bracket

14‧‧‧Brake drum

16‧‧‧Friction member

18‧‧‧Brake action mechanism

20‧‧‧Supporting member

22‧‧‧Adjustment mechanism

22A‧‧‧Second thread

23‧‧‧Nut

24‧‧‧Sealing components

26‧‧‧Brake component

26A‧‧‧Friction surface

26B‧‧‧Inner periphery

28‧‧‧Connecting member

28A‧‧‧Flange

28B‧‧‧Spline

28C‧‧‧ditch

29‧‧‧Sealing components

30‧‧‧Clutch mechanism

32‧‧‧Cooling plate

34‧‧‧Cover

36‧‧‧Rotating body

38‧‧‧Cam member

38A‧‧‧Recess

40‧‧‧rotating body

42‧‧‧Retainer

44‧‧‧First member

46‧‧‧Second member

48‧‧‧Forcing member

52‧‧‧Receiving Department

54‧‧‧First thread

D‧‧‧radial direction

H‧‧‧wheel

H2‧‧‧Hub tube

X‧‧‧Rotation axis direction

Claims (20)

A brake device is provided with: a bracket which can be installed on the bicycle frame; a brake drum which is rotatably arranged on the bracket; and a friction member which can be arranged in contact with the brake drum; and The brake action mechanism is constructed in such a way that the friction member is in contact with the brake drum; the brake drum includes: a brake member that can be in contact with the friction member; a connecting member that is attached to the bicycle frame One of the outer peripheral portions of the hub is connected; and a clutch mechanism, which is based on the relative rotational force generated between the brake member and the connecting member to allow the brake member and the connecting member to rotate relative to each other, connecting the brake member and The aforementioned connecting member. A brake device is provided with: a bracket which can be installed on the bicycle frame; a brake drum which is rotatably arranged on the bracket; and a friction member which can be arranged in contact with the brake drum; and The brake action mechanism is constructed in such a way that the friction member is in contact with the brake drum; the brake drum includes: a brake member that can be in contact with the friction member; a connecting member that is attached to the bicycle frame The hub connection; and the clutch mechanism, which is based on the relative rotational force generated between the braking member and the connecting member, in a manner that allows the braking member and the connecting member to rotate relative to each other, connecting the braking member and the connecting member; The aforementioned clutch mechanism includes: a first member, which is non-rotatably provided on the aforementioned braking member; a second member, which is non-rotatably provided on the aforementioned connecting member; and a force applying member which connects the first member and the second member. The members oppose each other and exert force. Such as the braking device of the second item of the scope of patent application, wherein the first member is provided on the inner periphery of the braking member. For example, the brake device of the third item of the scope of patent application further includes a support member, which is provided on the inner periphery of the brake member, the outer periphery of the support member is spline-fitted with the inner periphery of the brake member, and the support The inner peripheral part of the member is spline-fitted with the aforementioned first member. For example, the braking device of any one of items 2 to 4 of the scope of patent application, wherein the second member is provided on the outer periphery of the connecting member. Such as the brake device of the fifth item of the scope of patent application, wherein the inner peripheral part of the second member is spline-fitted with the outer peripheral part of the connecting member. Such as the brake device of the second item of the scope of patent application, wherein the aforementioned clutch mechanism includes a plurality of the aforementioned first members and a plurality of the aforementioned second members. As for the brake device of claim 2, wherein at least one of the first member and the second member has at least one recess on the surface facing the other of the first member and the second member. Such as the braking device of item 8 of the scope of patent application, wherein the aforementioned recess is a through hole. For example, the braking device of item 8 or item 9 of the scope of patent application, wherein the aforementioned recessed portion is formed in the aforementioned first member. For the brake device of the second item of the scope of patent application, the force applying member is arranged in the direction of the rotation axis of the brake drum, and the clutch mechanism is arranged on the side opposite to the hub. As for the brake device of claim 2, wherein at least one of the brake member and the connecting member has a receiving portion that receives the force of the urging member through the first member and the second member. Such as the braking device of the 12th item of the scope of patent application, wherein the aforementioned receiving part is provided on the aforementioned connecting member. For example, the brake device of the second item of the scope of patent application further includes an adjustment mechanism for adjusting the force applied by the force applying member to the first member and the second member. For example, the brake device of claim 14, wherein the adjustment mechanism has a second threaded portion, which is screwed into the first threaded portion provided on at least one of the brake member and the connecting member, and is driven by the second thread The screwing amount of the part to the first threaded part is used to adjust the force of the force applying member. For example, the brake device according to any one of items 1 to 4 of the scope of the patent application further includes a sealing member for preventing foreign matter from intruding into the aforementioned clutch mechanism. Such as the braking device of the 16th patent application, wherein the sealing member is arranged between the braking member and the connecting member. For example, the brake device of any one of items 1 to 4 of the scope of patent application, wherein the aforementioned connecting member is fitted with the spline of the aforementioned wheel hub. For example, in the braking device of any one of items 1 to 4 in the scope of the patent application, the braking member has a friction surface on the inner periphery, and the friction member is arranged in contact with the friction surface of the braking member. For example, the brake device of any one of items 1 to 4 of the scope of patent application, wherein the bicycle frame is provided with a front fork, and the bracket can be mounted on the front fork.

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