TW201914840A - Brake device including a bracket, a brake drum, a friction member and a brake operating mechanism - Google Patents

Abstract

The present invention provides a brake device that can be used universally. The brake device includes a bracket mountable on a bicycle frame; a brake drum rotatably provided on the bracket; a friction member configured to contact with the brake drum; and a brake operating mechanism configured to bring the friction member into contact with the brake drum. The brake drum includes a brake member configured to contact with the friction member; a connecting member connected to a hub provided on the bicycle frame; and a clutch mechanism that allows the brake member and the connecting member to be connected in such a manner that the brake member and the connecting member are rotatable relative to each other by a relative rotational force generated between the brake member and the connecting member.

Description

 Braking device  

The present invention relates to a brake device.

A brake device for a bicycle is known, for example, from Patent Document 1. The brake device is coupled to the hub via a clutch mechanism. The clutch mechanism includes a first portion disposed on the brake device and a second portion disposed on the hub. The brake device and the hub are coupled via the first portion and the second portion in such a manner as to rotate relative to each other by a relative rotational force generated between the brake device and the hub.

[Previous Technical Literature]

[Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2007-62718

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

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

A brake device according to a first aspect of the present invention includes: a bracket that is attachable to a bicycle frame; a brake drum that is rotatably provided on the bracket; and a friction member that is in contact with the brake drum And a brake actuating mechanism configured to contact the friction member with the brake drum; the brake drum includes: a brake member that is in contact with the friction member; and a coupling member that is disposed in the foregoing a hub coupling on the bicycle frame; and a clutch mechanism that connects the brake member and the first rotation member to allow relative rotation between the brake member and the coupling member The aforementioned connecting member.

According to the brake device of the first aspect described above, since the clutch mechanism is provided in the brake device, it can be applied to a general-purpose hub. In addition, since the size of the clutch mechanism is not limited by the size of the hub, a clutch mechanism of a desired capacity can be realized.

The brake device of the first aspect, wherein the clutch mechanism includes: a first member that is non-rotatably provided to the brake member; and a second member that is non-rotatably provided to the coupling member; And a force applying member that urges the first member and the second member opposite to each other.

According to the brake device of the second aspect described above, the clutch mechanism of the desired capacity can be easily realized by the force applying member controlling the force acting between the first member and the second member.

According to a third aspect of the present invention, in the brake device of the second aspect, the first member is provided on an inner peripheral portion of the brake member.

When the brake device of the third aspect described above is used, the internal space of the brake member can be effectively utilized.

According to a fourth aspect of the present invention, in the brake device of the third aspect, the support member is further provided on an inner peripheral portion of the brake member, and the outer peripheral portion of the support member and the inner peripheral portion of the brake member are spline-embedded. The inner peripheral portion of the support member is spline-fitted to the first member.

When the brake device of the fourth aspect is used, the first member can be formed by spline fitting to form an assembly of the first member and the support member, and by attaching the assembly to the brake member. Simply mounted to the inner circumference of the brake member.

A brake device according to any one of the second to fourth aspect, wherein the second member is provided on an outer peripheral portion of the coupling member.

When the brake device of the fifth aspect described above is used, the second member can be simply attached to the joint member.

According to a sixth aspect of the invention, in the brake device of the fifth aspect, the inner peripheral portion of the second member and the outer peripheral portion of the connecting member are spline-fitted.

According to the brake device of the sixth aspect described above, the second member can be reliably and stably attached to the coupling member by spline fitting.

A brake device according to any one of the second to sixth aspect, wherein the clutch mechanism includes: a plurality of the first members and a plurality of the second members.

When the brake device of the seventh aspect is used, the capacity of the clutch mechanism can be increased by increasing the number of the first members and the number of the second members by the clutch mechanism.

The brake device of any one of the above-mentioned second to seventh aspect, 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 eighth aspect described above is used, the lubricating oil can be held in the recess.

A ninth aspect is the brake device of the eighth aspect, wherein the recess is a through hole.

When the brake device of the ninth aspect is used, the volume of the recess can be increased.

A brake device according to the eighth or ninth aspect, wherein the recess is formed in the first member.

According to the brake device of the tenth aspect, the weight can be reduced to constitute the first member.

The brake device according to any one of the preceding aspects, wherein the urging member is disposed in the rotation axis direction of the brake drum, and the first member and the second member are disposed in the foregoing The opposite side of the hub.

According to the brake device of the eleventh aspect, the biasing member and the clutch mechanism can be prevented from being exposed to the hub side in the direction of the rotation axis of the brake drum.

A brake device according to any one of the preceding claims, wherein at least one of the brake member and the connecting member has a receiving portion via the first member and the second member The force applied by the aforementioned force applying member is received.

According to the brake device of the twelfth aspect, the force can be appropriately applied between the first member and the second member by the receiving portion.

A brake device according to the twelfth aspect, wherein the receiving portion is coupled to the connecting member.

When the brake device of the thirteenth aspect is used, the structure of the brake member can be simplified.

A brake device according to any one of the second to thirteenth aspects, further comprising an adjustment mechanism that adjusts an urging force of the urging member to the first member and the second member.

According to the brake device of the fourteenth aspect, since the force acting between the first member and the second member can be adjusted, the capacity of the clutch mechanism can be arbitrarily adjusted.

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

According to the brake device of the fifteenth aspect, the biasing force of the biasing member can be easily adjusted by the first thread portion and the second thread portion, and the capacity of the clutch mechanism can be easily adjusted.

A brake device according to any one of the first to fifteenth aspects, further comprising a sealing member for suppressing entry of foreign matter into the clutch mechanism.

According to the braking device of the sixteenth aspect, the foreign matter can be appropriately prevented from entering the clutch mechanism by the sealing member.

According to a seventeenth aspect, the brake device of the sixteenth aspect, wherein the sealing member is disposed between the brake member and the coupling member.

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

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

According to the eighteenth aspect of the brake device described above, the coupling member and the hub can be integrally and stably rotated integrally by the spline fitting.

The brake device of any one of the above-mentioned first to eighteenth aspect, wherein the brake member has a friction surface on an inner peripheral portion, and the friction member is disposed in contact with a friction surface of the brake member .

According to the brake device of the nineteenth aspect, since the friction member can be disposed inside the brake member, the internal space of the brake member can be effectively utilized.

A brake device according to any one of the first to nineteenth aspect, wherein the bicycle frame includes a front fork, and the bracket is attachable to the front fork.

When the brake device of the twentieth aspect described above is used, versatility can be achieved in the hub mounted to the front fork.

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

10‧‧‧ brakes

12‧‧‧ bracket

14‧‧‧ brake drum

16‧‧‧ friction components

18‧‧‧Brake action mechanism

20‧‧‧Support members

22‧‧‧Adjustment agency

22A‧‧‧Second thread

23‧‧‧ Nuts

24‧‧‧ Sealing members

26‧‧‧Brake components

26A‧‧‧ Friction surface

26B‧‧‧ Inner Week

28‧‧‧Connected components

28A‧‧‧Flange

28B‧‧‧ Spline Department

28C‧‧‧Ditch

29‧‧‧ Sealing member

30‧‧‧Clutch mechanism

32‧‧‧cooling disc

34‧‧‧ Cover

36‧‧‧Rotating body

38‧‧‧Cam components

38A‧‧‧ recess

38B‧‧‧ cam surface

40‧‧‧Rotating body

42‧‧‧keeper

44‧‧‧ first component

46‧‧‧Second component

48‧‧‧ force components

50‧‧‧ recess

52‧‧‧Acceptance Department

54‧‧‧First threaded part

C‧‧‧Mechanical control cable

C1‧‧‧ inner cable

C2‧‧‧Outer cable

D‧‧‧Direction

F‧‧‧Bicycle frame

FA‧‧‧ front fork

H‧‧ Wheels

H1‧‧·Wheel axle

H2‧‧‧ hub

S‧‧‧ week direction

X‧‧‧Rotation axis direction

The first figure is a front view of the front fork and the hub in the state in which the brake device of the embodiment is mounted.

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 hub side.

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

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

Fig. 6 is an exploded perspective view of the clutch mechanism and the clutch mechanism in the fourth diagram.

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

The eighth diagram is a perspective view of the joint member viewed from the side opposite to the sixth diagram.

(embodiment)

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 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 disposed on the front fork FA. The hub H includes a hub shaft H1 and a hub H2 that is rotatably supported by the hub axle H1 on the hub axle H1. The front fork FA is attached to both end portions 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 (see the fourth drawing), and a brake operating mechanism 18 (see the fourth drawing). Further, as shown in the fourth figure, 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 to the bicycle frame F. The bracket 12 is configured to be mountable to the front fork FA. A guide portion 12A that guides the mechanical control cable C that operates the brake device 10 is provided in the bracket 12. The mechanical control cable C has an inner cable C1 and an outer cable C2. The end of the outer cable C2 is attached to the guide portion 12A.

As shown in the third and fourth figures, the brake drum 14 is rotatably disposed 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 coupling member 28 that is coupled to the hub H, and a clutch mechanism 30. The brake drum 14 further includes a cooling disc 32 provided on the outer peripheral portion of the brake member 26. The cooling disc 32 is configured to be integrally rotated with the brake member 26 by press-fitting, caulking, spline fitting, or the like. The brake drum 14 is partially attached to the end portion on the side opposite to the hub H in the rotation axis direction X of the brake drum 14 by being attached to the cover 34 of the bracket 12. The direction of the rotation axis of the brake drum 14 is the direction in which the hub H rotates the axis.

The brake member 26 has a cylindrical shape. The joint member 28 has a cylindrical shape. At least a portion of the coupling member 28 is disposed inside the brake member 26. The coupling member 28 has a flange portion 28A at the end portion of the hub H in the rotation axis direction X. The joint member 28 and the hub H are spline-fitted. Specifically, the spline portion 28B is provided on the inner peripheral portion of the coupling member 28. The spline portion 28B is spline-fitted with a plurality of convex portions provided on the outer peripheral portion of the hub cylinder H2, whereby the coupling member 28 and the hub H are integrally rotatably coupled. In addition, as long as the structure in which the hub H and the connecting member 28 are integrally rotatably coupled, a configuration other than spline fitting may be employed. In the inner peripheral portion of the coupling member 28, a groove 28C is formed in a portion closer to the hub H than the spline portion 28B in the rotation axis direction X. A sealing member 29 is provided in the groove 28C. The sealing member 29 is provided in a groove 28C which is in contact with the outer peripheral portion of the hub cylinder H2.

At least a part of the brake operating mechanism 18 is inside the brake member 26, and is disposed on the opposite side of the coupling member 28 from the hub H in the rotation axis direction X. The brake member 26 has a friction surface 26A at the inner peripheral portion. The friction surface 26A is formed in a portion of the inner peripheral portion of the brake member 26 that faces the brake action mechanism 18. As shown in the seventh figure, the friction surface 26A is formed with a plurality of grooves extending in the circumferential direction S of the brake drum 14. Thereby, the friction member 16 and the rubbing surface 26A can be brought into line contact at a plurality of points.

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

The cam member 38 is coupled 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 disk shape. The cam member 38 includes a plurality of recesses 38A provided on the outer peripheral portion, and a cam surface 38B provided between the adjacent two recessed portions 38A. The cam surface 38B is provided so as to move to one of the circumferential directions S of the brake drum 14 (clockwise direction in the fifth drawing), and expands outward in the radial direction D of the brake drum 14. In the non-braking state, the rotors 40 are respectively disposed at the outer peripheral portion of the rotating body 36 and at a position corresponding to the recess 38A. The holder 42 rotatably holds a plurality of rotating bodies 40, respectively. Further, the retainers 42 respectively hold the plurality of rotating bodies 40 in the radial direction D. A plurality of friction members 16 are disposed in the radial direction D and outside the plurality of rotors 40. In the present embodiment, the brake operating mechanism 18 includes three friction members 16 and six rotors 40. Further, in the present embodiment, one friction member 16 is disposed on the two rotors 40. Therefore, the friction member 16 can be disposed in contact with a plurality of (here, two) rotating bodies 40.

The friction member 16 is a brake block (Brake-shoe) that is disposed in contact with the brake drum 14. The friction member 16 is disposed in contact with the friction surface 26A of the brake member 26. Specifically, the friction surface 26A of the brake drum 14 is disposed on the outer side of the plurality of friction members 16 in the radial direction D. With the operation of the operation device (brake lever) not shown, the rotary body 36 is rotated by pulling the inner cable C1, and the cam member 38 is rotated. The cam member 38 moves the other side of the rotor 40 in the circumferential direction S (the counterclockwise direction in the fifth figure), and the cam surface 38B of the cam member 38 pushes the rotor 40 in the radial direction D and outward. 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 rubbing 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 link in such a manner that the brake member 26 and the joint member 28 are relatively rotated in accordance with the relative rotational force generated between the brake member 26 and the joint member 28. Member 28. The clutch mechanism 30 is provided between the inner peripheral portion of the brake member 26 and the outer peripheral portion of the coupling member 28. The clutch mechanism 30 is disposed in the rotation axis direction X and is closer to one side of the hub H than the brake operation mechanism 18.

The clutch mechanism 30 includes a first member 44 that is non-rotatably provided to the brake member 26, a second member 46 that is non-rotatably provided to the coupling member 28, and a first member 44 and the second member 46 that are opposed to each other. The force member 48 is applied. The clutch mechanism 30 includes a plurality of first members 44 and a plurality of second members 46. In the present embodiment, the clutch mechanism 30 includes three first members 44 and three second members 46. The number of first members 44 and the number of second members 46 are preferably equal. The first member 44 has a disk shape. The second member 46 has a disk shape. The first member 44 and the second member 46 alternately overlap.

The first member 44 is provided at an inner peripheral portion of the brake 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 is spline-fitted with the first member 44.

The second member 46 is provided on the outer peripheral portion of the joint member 28. The inner peripheral portion of the second member 46 and the outer peripheral portion of the coupling 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 other surface facing 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 the respective first members 44 are aligned 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. The lubricating oil is held 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 disposed on the opposite side of the hub H with respect 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 brake member 26 and the coupling member 28 has a receiving portion 52 that receives an 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 in the coupling member 28. As shown in the fourth figure, the receiving portion 52 is provided on the flange portion 28A of the coupling member 28. A plurality of first members 44 and a 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 screw portion 22A that is screwed into the first screw portion 54 provided on at least one of the brake member 26 and the coupling member 28. As shown in FIG. 8 , the first screw portion 54 is provided at an end portion of the coupling member 28 opposite to the receiving portion 52 in the rotation axis direction X. The second screw portion 22A is provided in a nut 23 different from the coupling member 28. The adjustment mechanism 22 adjusts the biasing force of the biasing member 48 by the amount of screwing of the first threaded portion 54 by the second threaded portion 22A. Since the larger the amount of screwing of the second threaded portion 22A to the first threaded portion 54, the greater the frictional force between the first member 44 and the second member 46, 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 large. The clutch mechanism 30 switches between the relative rotational force generated between the brake member 26 and the coupling member 28 and the frictional force between the first member 44 and the second member 46, and the relative rotation of the brake member 26 and the coupling member 28 is not permitted. The first state, and the second state that allows relative rotation. The greater the friction between the first member 44 and the second member 46, the less likely the clutch mechanism 30 is to switch from the first state to the second state.

As shown in the fourth figure, the sealing member 24 is provided in order to suppress foreign matter from entering the clutch mechanism 30. The seal member 24 is disposed between the brake member 26 and the joint member 28. One example is the sealing member 24 being an O-ring. The seal member 24 is disposed between the outer peripheral portion of the flange portion 28A of the joint member 28 and the inner peripheral portion of the brake member 26 .

A method of combining the brake devices 10 will be described.

In the first step, the first member 44 and the second member 46 are alternately inserted from the first screw portion 54 side toward the receiving portion 52 at the outer peripheral portion of the coupling member 28. The inner peripheral portion of the second member 46 and the outer peripheral portion of the coupling member 28 are spline-fitted. In the second step, the support member 20 is fitted to the outer peripheral portion of the first member 44, and the outer peripheral portion of the first member 44 and the inner peripheral portion of the support member 20 are spline-fitted. In the third step, the urging member 48 is inserted from the first screw portion 54 side in the outer peripheral portion of the coupling member 28, and the second screw portion 22A of the nut 23 is screwed into the first screw portion 54 of the coupling member 28 to form a third screw portion 54. 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 disposed on the inner peripheral portion of the brake member 26 or the outer peripheral portion of the coupling member 28 . By inserting the first assembly into the inner peripheral portion of the brake member 26, the outer peripheral portion of the support member 20 is spline-fitted with the inner peripheral portion of the brake member 26.

In the fifth step, the friction member 16 and the brake operating mechanism 18 are disposed inside the brake member 26. In the sixth step, the cooling disc 32 is attached to the outer periphery of the brake member 26. In the seventh step, the bracket 12 and the cover 34 are attached to the brake operating mechanism 18. The sixth step can also be carried out earlier than the fifth step.

(Modification)

The description of the above embodiment is exemplified by the form of the brake device according to the present invention, and is not limited to the form. According to the brake device of the present invention, for example, a modification of the above-described embodiment shown below and a combination of at least two modifications which do not contradict each other can be employed. In the following, the same components as those in the embodiment are denoted by the same reference numerals as in the embodiment, and the description thereof will be omitted.

The brake member 26 may also have a receiving portion 52. At this time, the brake member 26 is provided with a convex portion that protrudes toward the inside in the radial direction, and the receiving portion 52 is provided in the convex portion.

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

‧ The biasing member 48 may be disposed on the hub H side of the clutch mechanism 30 in the rotation axis direction X of the brake drum 14. At this time, in the rotation axis direction X of the brake drum 14, the receiving portion 52 should be disposed on the opposite side of the hub H from the clutch mechanism 30.

‧ The present invention is also applicable to brake devices other than roller brake devices. For example, the present invention can also be applied to a drum band break device and a drum brake device.

Claims (20)

 A brake device comprising: a bracket that can be mounted on a bicycle frame; a brake drum rotatably disposed on the bracket; and a friction member that is disposed in contact with the brake drum; and a brake actuating mechanism configured to contact the friction member with the brake drum; the brake drum includes: a brake member that is in contact with the friction member; and a coupling member that is disposed on the bicycle frame And a clutch mechanism that connects the brake member and the connecting member so as to allow relative rotation between the brake member and the connecting member in accordance with a relative rotational force generated between the brake member and the connecting member.    The brake device of claim 1, wherein the clutch mechanism includes: a first member that is non-rotatably disposed on the brake member; and a second member that is non-rotatably disposed on the coupling member; The urging member urges the first member and the second member to face each other.    The brake device of claim 2, wherein the first member is attached to an inner peripheral portion of the brake member.    The brake device according to claim 3, further comprising: a support member attached to an inner peripheral portion of the brake member, wherein the outer peripheral portion of the support member and the inner peripheral portion of the brake member are spline-fitted The inner peripheral portion of the support member is spline-fitted to the first member.    The brake device according to any one of claims 2 to 4, wherein the second member is provided on an outer peripheral portion of the coupling member.    The brake device according to claim 5, wherein the inner peripheral portion of the second member is spline-fitted to the outer peripheral portion of the connecting member.    The brake device according to any one of claims 2 to 4, wherein the clutch mechanism includes a plurality of the first members and a plurality of the second members.    The brake device according to any one of claims 2 to 4, 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 of one side has at least one recess.    The brake device of claim 8, wherein the recess is a through hole.    The brake device of claim 8, wherein the recess is formed in the first member.    The brake device according to any one of claims 2 to 4, wherein the urging member is disposed in the direction of a rotation axis of the brake drum, and the first member and the second member are disposed in the foregoing The opposite side of the hub.    The brake device according to any one of claims 2 to 4, wherein at least one of the brake member and the connecting member has a receiving portion that is received by the first member and the second member The force applied by the aforementioned force applying member.    The brake device according to claim 12, wherein the receiving portion is attached to the connecting member.    The brake device according to any one of claims 2 to 4, further comprising an adjustment mechanism that adjusts an urging force of the urging member to the first member and the second member.    The brake device according to claim 14, wherein the adjustment mechanism has a second threaded portion that is screwed into a first threaded portion provided on at least one of the brake member and the coupling member, and the adjustment mechanism is The biasing force of the biasing member is adjusted by the amount of screwing of the second threaded portion to the first threaded portion.    The brake device according to any one of claims 1 to 4, further comprising a sealing member for suppressing entry of foreign matter into the clutch mechanism.    The brake device according to claim 16, wherein the sealing member is disposed between the brake member and the coupling member.    The brake device according to any one of claims 1 to 4, wherein the connecting member is spline-fitted to the hub.    The brake device according to any one of claims 1 to 4, wherein the brake member has a friction surface on an inner peripheral portion, and the friction member is disposed in contact with a friction surface of the brake member.    The brake device according to any one of claims 1 to 4, wherein the bicycle frame includes a front fork, and the bracket is attachable to the front fork.