TWM593485U - Replaceable drum brake device gap automatic compensation device - Google Patents

Abstract

A replaceable drum brake clearance automatic compensation device is used to solve the problem that the components of the conventional brake automatic adjustment device cannot be replaced. The system includes: a swing arm, one end of which has a pivoting portion, and the other end of which has a set of connecting portions and a side plate to jointly support a rotating shaft positioning pivot, the side plate has a protruding pressing column, and the rotating shaft has a The screw hole is for screwing the first end of a screw; and a compensation group, an internal thread of an adjusting cylinder is screwed to the first end of the screw, and one end surface of the adjusting cylinder abuts the rotating shaft. It is placed in a shaft hole of a bearing sleeve. A one-way bearing is provided between the adjusting cylinder and the bearing sleeve. The outer peripheral wall of the bearing sleeve has a linkage plate and a linkage wheel. The linkage plate has a guide hole. The guide hole The pressing column for the side plate is extended, and the linking plate and the linking wheel are combined to rotate synchronously by a fixed member.

Description

Interchangeable drum brake clearance automatic compensation device

This creative department provides a replaceable drum brake gap automatic compensation device, especially a problem that the components of the drum brake gap automatic compensation device can be disassembled and replaced.

The conventional drum brake has a good self-braking effect, and under the condition of generating the same braking torque, the diameter of the brake drum of the drum brake can be much smaller than the diameter of the brake disk of the disc brake, plus the drum brake has parts Many advantages such as low cost and convenient maintenance make drum brakes widely used in the brake systems of automobiles, locomotives, bicycles or other various vehicles. It is worth noting that drum brakes are prone to wear out the brake shoes of the brake shoes as the number of brakes increases, which causes the distance between the brake shoes and the brake drum to expand, resulting in the brake wire used to drive the brake shoes must be Pulling a longer distance can make the brake shoe contact the friction brake drum. In other words, the user must extend the stroke of the brake lever or step on the brake pedal to obtain the same as the brake shoe before the wear. The braking force.

Referring to FIG. 1, it is a conventional drum brake device 9. The drum brake device 9 is fixed to a directional handle 92 of a vehicle by a brake handle 91. When the brake handle 91 is pressed, it passes through a The brake wire 93 is linked to a screw 94, and one end of a swing arm 95 is screwed to the screw 94, so that the swing arm 95 can pivot according to a shaft 96 of the drum brake device 9, which can drive the brake shoe when the shaft 96 pivots The disc (not shown) spreads outward to press against the brake drum mounted on the rim of the vehicle, thereby generating braking force.

As the use time increases, the brake shoe blades gradually wear out, so that the distance between the brake shoe blades and the brake drum expands, causing the user to pull the brake handle 91. The stroke must be extended. It can make the brake shoes come into contact with the brake drum to produce a braking effect. According to this, the conventional drum brake device 9 relies on the manual rotation of a nut 97 screwed on the screw 94 to force the swing arm 95 to move in the direction of the brake wire 93 to slightly spread the brake shoes outward In order to maintain the braking effect of the conventional drum brake device 9, the distance between the brake shoe brake pad and the brake drum is formed at the same level as before the brake pad has not been worn.

In order to solve the above-mentioned problems, please refer to FIG. 2, which is a conventional automatic brake adjusting device 8. The conventional automatic brake adjusting device 8 is connected with a brake handle (same as above, not shown in the figure), which can pull a brake wire 81 to interlock A screw 82, one end of the screw 82 is screwed to a rotating shaft 831 and a one-way bearing 84 at the first end 83a of a swing arm 83, and a cam 85 is sleeved at the extended end of the screw 82, and a screw The cap 821 is screwed to the screw 82, the cam 85 has a driving portion 851 and extends into a slot 832 of a swing arm 83, the second end 83b of the swing arm 83 is coupled to the drum by a shaft hole 833 The pivot of a shaft of the type brake device (same as above, not shown), the brake shoe (not shown) can be driven out when the shaft pivots, so that the brake can be installed against the pressure The brake drum of the vehicle rim, which in turn produces the braking force.

In the conventional automatic brake adjusting device 8 described above, since the screw 82 forms an inclined angle with the brake wire 81 forming a linear movement, and because the driving portion 851 of the cam 85 extends into the slot 832 of the swing arm 83 Therefore, when the user pulls the brake handle, the screw 82 will rotate in a direction at a small angle according to the center C1 of the shaft hole 833 (for example, clockwise), and the swing arm 83 will also follow this The center C2 of the rotating shaft 831 rotates in one direction at a small angle (for example, clockwise), so that the swing arm 83 will force the cam 85 and the one-way bearing 84 to rotate in a small amount in one direction relative to the screw 82 ( (For example, counterclockwise), when the brake shoe wear causes the distance between the brake shoe and the brake drum to increase, the axial displacement of the one-way bearing 84 relative to the screw 82 can force the first position of the swing arm 83 One end 83a moves in the direction of the brake line 81 to slightly extend the brake shoe outwards, so that the distance between the brake shoe and the brake drum is formed at the same level as before the brake shoe has been worn, to automatically Adjust the braking effect of the conventional automatic brake adjustment device 8.

The conventional automatic brake adjusting device 8, when the conventional automatic brake adjusting device 8 has been used for a long time, the one-way bearing 84 can no longer be axially displaced relative to the screw 82, resulting in the brake shoe and the brake drum When the distance between the two cannot be adjusted to the same level as before the blade has not been worn, the rotating shaft 831 cannot be disassembled from the swing arm 83, and the cam 85 is fitted into the slot 832 of the swing arm 83 And the one-way bearing 84 cannot be adjusted in reverse rotation. Therefore, the conventional automatic brake adjustment device 8 needs to be replaced with the brake wire 81, the screw 82, the brake shoe and the brake shoe, so that it will cause a waste of resources, and Cause consumers' burden.

In view of this, the conventional automatic brake adjusting device still needs to be improved.

In order to solve the above problems, the purpose of this creation is to provide a replaceable drum brake clearance automatic compensation device, which can automatically adjust the distance between the brake shoe and the brake drum by pressing the brake handle to automatically adjust the brake shoe To compensate for the wear of the brake shoe.

The second objective of this work is to provide a replaceable automatic brake gap compensation device. When the distance between the brake shoe and the brake drum cannot be adjusted to the same level as before the brake shoe has not been worn, It is possible to adjust the drum brake gap automatic compensation device only by replacing the brake shoes to avoid wasting resources and reducing the burden on consumers.

The directionality or its approximate terms in the full text of this creation, such as "front", "back", "left", "right", "upper (top)", "lower (bottom)", "inner", "outer" , "Side", etc., mainly refer to the directions of the attached drawings, and each directivity or its approximate terms are only used to help explain and understand the embodiments of the creation, not to limit the creation.

The use of the quantifier "a" or "one" in the elements and components described in the full text of this creation is only for convenience and provides the usual meaning of the scope of this creation; in this creation, it should be interpreted as including one or at least one, and single The concept of also includes the plural case unless it clearly means something else.

Similar terms such as "combination", "combination", or "assembly" described in the full text of this creation mainly include the types that can be separated without damaging the components after connection, or the components cannot be separated after connection, which is common knowledge in the field It can be selected according to the material or assembly requirements of the components to be connected.

The interchangeable drum brake gap automatic compensation device of the present invention includes: a swing arm, one end of which has a pivoting portion, and the other end of which has a set of connecting portions and a side plate to jointly support a pivot shaft positioning pivot, the side plate is It has a protruding pressure column, the rotating shaft has a screw hole for screwing the first end of a screw; and a compensation group, the internal thread of an adjusting cylinder is screwed to the first end of the screw, the adjusting cylinder One end face of the bearing abuts on the rotating shaft, the adjusting cylinder is accommodated in a shaft hole of a bearing sleeve, and there is a one-way bearing between the adjusting cylinder and the bearing sleeve, and the outer peripheral wall of the bearing sleeve has a linkage plate and a linkage For the wheel, the linking plate has a guide hole for the pressure column of the side plate to extend in, and the linking plate and the linking wheel are combined to rotate synchronously by a fixed member.

According to this, the interchangeable drum brake gap automatic compensation device of the present invention can make the distance between the blade and the brake drum at a predetermined level by pressing the brake handle, so that the vehicle can Maintain the best braking effect. In addition, when the brake shoe has serious wear on the brake pad, and the distance between the brake pad and the brake drum can no longer be adjusted to the same level as before the brake pad has not been worn, it can be removed by the fixing member, The linkage plate and the linkage wheel cannot be linked, that is, the adjustment cylinder can be directly rotated and reset to an initial position, and only the order piece needs to be replaced, which can avoid waste of resources and reduce consumer burden Effect.

Wherein, the side plate extends from the swing arm. In this way, the side plate and the assembly part can jointly support the pivoting effect of the rotating shaft.

Wherein, the outer peripheral wall of the bearing sleeve utilizes the difference in size and diameter to form a stop portion, and the interlocking plate is rotatably sleeved on the smaller diameter portion and abuts on the stop portion from one side. In this way, the interlocking wheel train has the effect of restricting the interlocking plate from coming out of the outer peripheral wall of the bearing sleeve.

Wherein, the interlocking wheel system is coupled to the outer peripheral wall of the bearing sleeve by a hole with a tight fit. In this way, the linked gear train can be firmly fixed to the outer peripheral wall of the bearing sleeve, and has the effect of synchronous rotation with the bearing sleeve.

Wherein, the linkage plate has a screw hole, the linkage wheel has a through hole, and the fixing member is a screw member, so that the fixing member passes through the through hole to be screwed into the screw hole, so that the linkage board and the linkage The wheels form a synchronous rotation. In this way, the fixing member can be easily disassembled so that the interlocking wheel can be separated from the interlocking plate for rotating the interlocking wheel and the bearing sleeve, which can be used to adjust the rotation effect of the adjusting cylinder.

The replaceable drum brake gap automatic compensation device of the present invention may further include a contacting member, the contacting member has a contacting end to match the outer peripheral surface of the rotating shaft, and the other end of the contacting member has a contacting Part, the end surface of the adjusting cylinder abuts the abutting part. In this way, the abutting member can be abutted on the rotating shaft by the abutting end, so that the end surface of the adjusting cylinder can stably abut on the effect of the abutting portion.

Wherein, the outer peripheral surface of the adjusting cylinder has a ring groove, the abutment piece has a ring groove, and a ring body is interposed between the ring groove and the ring groove. In this way, the side plate and the assembly part can jointly support the pivoting effect of the rotating shaft.

Wherein, the outer peripheral surface of the abutment has a shell tube, the shell tube has a flange protruding in the inner diameter direction, the outer peripheral wall of the bearing sleeve has an insertion groove, and the flange is fitted into the insertion groove. In this way, with the arrangement of the shell tube, the compensation system has better waterproof and anti-fouling effects.

The replaceable drum brake gap automatic compensation device of this invention may also include a brake wire, one end of the brake wire is coupled to the second end of the screw. In this way, the swing arm can be pivoted by the brake wire to drive the brake shoes of the drum brake device, which can be used to reduce the rotation speed of the vehicle wheel body or stop the rotation of the vehicle wheel body, and The distance between the brake pad and the brake drum can be formed at a predetermined level, so that the vehicle can maintain the effect of the best braking effect.

In order to make the above-mentioned and other purposes, features and advantages of this creation more obvious and understandable, the preferred embodiments of this creation are specifically described below, and in conjunction with the attached drawings, detailed descriptions are as follows:

Please refer to Figures 3, 4, and 7, which is a preferred embodiment of the original replaceable drum brake gap automatic compensation device, which includes a swing arm 1 and a compensation group 2, the swing arm 1 One end of can be combined with a shaft column of a conventional drum brake device, and the compensation group 2 is combined with the other end of the swing arm 1 to form an automatic compensation adjustment of the drum brake gap.

One end of the swing arm 1 has a pivoting portion 11 which can be combined with a shaft post (not shown) of a conventional drum brake device of a vehicle to press a brake handle of the vehicle When pressing, the pivoting of the swing arm 1 can be pulled through a brake wire W, and the pivoting of the swing arm 1 can drive the brake shoes of the drum brake device to provide lowering of the wheel body of the vehicle. The rotation speed may stop the rotation of the wheel body of the vehicle, and when the pressing of the brake handle of the vehicle is stopped, the axle of the drum brake device may be reset to rotate, and the swing arm 1 may be reset to a standard The position is such that the distance between the brake disc of the drum brake device and the brake drum is formed at a predetermined level. This is the basic operation principle of the drum brake device of the vehicle, and its structure will not be described in detail.

The other end of the swing arm 1 has a set of connecting portions 12 that can support a pivot shaft 14 to pivot with the side plate 13. The side plate 13 can extend from the swing arm 1 and the side plate The 13 series has a protruding pin 131. The rotating shaft 14 has a screw hole 141 for the first end 15a of a screw 15 to be screwed together, and the second end 15b of the screw 15 can be combined with one end of the brake wire W.

The compensation group 2 has an adjustment barrel 21 with an internal thread 211 that can be screwed to the first end 15a of the screw 15, and an end surface 21a of the adjustment barrel 21 can abut the rotating shaft 14 or a An abutting portion 262 (to be described in detail later) of the abutting member 26, the adjusting cylinder 21 is accommodated in a shaft hole 221 of a bearing sleeve 22, and a one-way bearing is provided between the adjusting cylinder 21 and the bearing sleeve 22 222, the bearing sleeve 22 can only rotate in one direction relative to the adjusting cylinder 21. For example, the outer wall of the outer ring of the one-way bearing 222 is combined with the shaft hole 221 of the bearing sleeve 22, and the inner wall of the inner ring of the one-way bearing 222 is combined with the outer tube wall of the adjustment barrel 21, and the combination may be By means of tight fitting and the like, the bearing sleeve 22 can only rotate in one direction with respect to the adjusting cylinder 21.

The outer peripheral wall of the bearing sleeve 22 preferably utilizes the difference in size and diameter to form a stop portion 223. The smaller diameter portion can be used to sequentially nest a linking plate 23 and a linking wheel 24. The linking plate 23 can be formed by a The perforation 231 is sleeved on the smaller diameter portion of the bearing sleeve 22, the side of the interlocking plate 23 can abut on the stop portion 223, the interlocking wheel 24 is coupled to the outer peripheral wall of the bearing sleeve 22 by a hole 241 , So that the interlocking plate 23 is restricted between the stopper 223 and the interlocking wheel 24 and can rotate relative to the bearing sleeve 22, the hole 241 of the interlocking wheel 24 and the bearing sleeve 22 can use tight fit, etc. In combination, the interlocking wheel 24 and the bearing sleeve 22 rotate synchronously. The linking plate 23 further has a guide hole 232 for the pressing post 131 of the side plate 13 to extend, so that the pivoting of the swing arm 1 can force the linking plate 23 to pivot through the pressing post 131 . The interlocking plate 23 and the interlocking wheel 24 can be combined via a fixing member 25, so that the interlocking plate 23 and the interlocking wheel 24 can form a synchronous rotation. In this embodiment, the interlocking plate 23 has a screw hole 233, the The linking wheel 24 has a through hole 242, and the fixing member 25 can be a screw member, so that the fixing member 25 can pass through the through hole 242 to be screwed into the screw hole 233, so that the linking plate 23 and the linking wheel 24 Synchronous rotation can be formed, and by the disassembly of the fixing member 25, the interlocking wheel 24 can be separated from the interlocking plate 23, and can be used to rotate the interlocking wheel 24 and the bearing sleeve 22, which can be used to adjust The adjustment cylinder 21 rotates (to be described in detail later).

In order to have a more stable effect between the end surface 21a of the adjusting cylinder 21 and the rotating shaft 14, in this embodiment, a contact member 26 is further included. One end of the contact member 26 has a contact end 261, which The abutting end 261 can cooperate with the outer circumferential surface of the rotating shaft 14, so that the abutting member 26 can be stably abutted on the rotating shaft 14 by the abutting end 261, the other end of the abutting member 26 has a abutting portion 262, The end surface 21 a of the adjustment tube 21 can be in contact with the contact portion 262. Preferably, the outer peripheral surface of the adjusting barrel 21 may further have a ring groove 212, from which an elastically deformable ring body 263 can be provided, and the abutment 26 can also have a ring groove 264, so that The ring body 263 can be interposed between the ring groove 212 and the ring groove 264, so that the abutment member 26 and the adjusting cylinder 21 have a better combination effect. In addition, the outer peripheral surface of the contact member 26 may further have a shell tube 27, and the shell tube 27 may have a flange 271 protruding in an inner diameter direction, and the flange 271 may be fitted into the outer wall of the bearing sleeve 22 An embedded groove 224 is provided with the shell tube 27 to make the compensation group 2 have better waterproof and anti-fouling effects.

Please refer to Figures 4 and 5 for an example of the use of the original replaceable drum brake gap automatic compensation device. The swing arm 1 is combined with the pivoting portion 11 of a conventional vehicle drum brake device. An axle column (not shown), one end of a brake wire W is connected to the second end 15b of the screw 15, and the other end of the brake wire W is connected to a brake handle of the vehicle. When the brake handle is pressed, the brake wire W pulls the swing arm 1. Since the brake wire W and the screw 15 form an angle with a non-linear angle, the brake wire W pulls the swing arm At 1 o'clock, the screw 15 will rotate at a small angle (approximately 7°) according to the center C2 of the rotating shaft 14 so that the screw 15 is substantially in line with the brake wire W; and the swing arm 1 will be combined with the vehicle drum The center C1 of the axle column of the type brake device rotates counterclockwise (according to the figure).

As shown in FIGS. 5 and 6, when the screw 15 rotates at a small angle according to the center C2 of the rotating shaft 14, the pressing column 131 presses the linking plate 23, so that the linking plate 23 is centered on the pivoting hole 231 C3 pivots in a clockwise direction (as shown in Figure 6), because the linking plate 23 and the linking wheel 24 are combined with the fixing member 25, so that the linking wheel 24 can form a synchronous rotation, and the linking wheel 24 is combined On the outer peripheral wall of the bearing sleeve 22, and since the outer ring of the one-way bearing 222 cannot rotate relative to the inner ring, the interlocking wheel 24 can drive the adjusting cylinder 21 to rotate synchronously through the one-way bearing 222, thereby screwing The adjusting barrel 21 on the screw 15 can move axially with respect to the screw 15 in the direction of the brake line W, so that a predetermined distance can be formed between the brake shoe and the brake drum, so that The drum brake device maintains the best braking effect.

When the brake handle is pressed, the drum brake device of the vehicle will cause the swing arm 1 to rotate and reset in a clockwise direction according to the center of the axle column C1, and the brake wire W is reset to the state before it is not pulled, so that the The brake wire W and the screw 15 are non-linear at an angle. When the swing arm 1 is reset and rotated in a clockwise direction according to the center of the shaft column C1, the pressing column 131 presses the interlocking plate 23 to reset, so that the interlocking plate 23 The center C3 of the perforated hole 231 pivots in a counterclockwise direction. Since the one-way bearing 222 can only rotate in one direction, the one-way bearing 222 can only rotate idly, which cannot drive the adjusting cylinder 21 to rotate synchronously, so as to screw The adjusting barrel 21 on the screw 15 is positioned relative to the screw 15 and cannot be moved axially.

Please refer to Fig. 8, when after a long period of use, the adjustment barrel 21 moves to the end of the screw 15 and can no longer move axially in the direction of the brake line W, at this time, the worker can The fixing member 25 is disassembled so that the interlocking plate 23 and the interlocking wheel 24 are not interlocked. In this way, the adjusting cylinder 21 can be directly rotated back to an initial position, and only the drum brake device needs to be replaced That is, when the replacement work is completed, the worker can reuse the fixing member 25 to combine the linking plate 23 and the linking wheel 24, so that the linking plate 23 and the linking wheel 24 can be linked, that is, the replacement of the drum type can be achieved The brake pad of the brake device works so that the distance between the brake pad of the drum brake device and the brake drum is formed at a predetermined level.

In summary, the interchangeable drum brake gap automatic compensation device of the present invention can make the distance between the blade and the brake drum at a predetermined level by pressing the brake handle, so that the The vehicle can maintain the best braking effect. In addition, when the brake shoe has serious wear on the brake pad, and the distance between the brake pad and the brake drum can no longer be adjusted to the same level as before the brake pad has not been worn, it can be removed by the fixing member, The linkage plate and the linkage wheel cannot be linked, that is, the adjustment cylinder can be directly rotated and reset to an initial position, and only the order piece needs to be replaced, which can avoid waste of resources and reduce consumer burden Effect.

Although this creation has been disclosed using the above preferred embodiments, it is not intended to limit this creation. Anyone who is familiar with this art will still make changes and modifications to the above embodiments without departing from the spirit and scope of this creation. The scope of technology protected by the creation, so the scope of protection of this creation shall be deemed as defined by the scope of the attached patent application.

﹝This creation﹞ 1: swing arm 11: pivot joint 12: Assembling Department 13: Side panel 131: Column 14: shaft 141: screw hole 15: screw 15a: the first end 15b: the second end 2: compensation group 21: Adjustment cylinder 21a: end face 211: internal thread 212: Ring groove 22: bearing sleeve 221: Shaft hole 222: one-way bearing 223: Stop 224: Slotted 23: linkage board 231: Piercing 232: pilot hole 233: screw hole 24: Interlocking wheel 241: Hole 242: through hole 25: fixings 26: abutment 261: abutting end 262: Abutment 263: Torus 264: Ring groove 27: Shell tube 271: flange W: brake line ﹝Practice﹞ 8: Automatic brake adjustment device 81: brake line 82: screw 821: Nut 83: Swing arm 83a: the first end 83b: the second end 831: hinge 832: Slot 833: Shaft hole 84: one-way bearing 85: cam 851: Driving Department 9: Drum brake 91: Brake handle 92: direction handle 93: brake line 94: screw 95: Swing arm 96: axis 97: nut C1: Center C2: Center C3: Center

[Picture 1] Diagram of a conventional drum brake device. [Picture 2] Diagram of conventional brake automatic adjustment device. [Figure 3] An exploded perspective view of the first preferred embodiment of this creation. [Figure 4] A combined perspective view of the first preferred embodiment of this creation. [Figure 5] A combined front view of the first preferred embodiment of this creation. [Figure 6] The left side view as shown in Figure 5. [Figure 7] A cross-sectional view along line A-A in Figure 6. [Figure 8] The adjustment situation shown in Figure 7.

1: swing arm

11: pivot joint

12: Assembling Department

13: Side panel

131: Column

14: shaft

15: screw

2: compensation group

21: Adjustment cylinder

23: linkage board

232: pilot hole

233: screw hole

24: Interlocking wheel

25: fixings

27: Shell tube

271: flange

W: brake line

Claims (9)

A replaceable drum brake clearance automatic compensation device includes: A swing arm, one end has a pivoting portion, and the other end has a set of connecting portions and a side plate to support a rotating shaft positioning pivot, the side plate has a protruding pressure column, the rotating shaft has a screw hole for The first end of a screw is screwed; and A compensation group, an internal thread of an adjusting cylinder is screwed to the first end of the screw, an end surface of the adjusting cylinder abuts against the rotating shaft, the adjusting cylinder is accommodated in a shaft hole of a bearing sleeve, and the adjusting cylinder There is a one-way bearing between the bearing sleeve and the outer peripheral wall of the bearing sleeve has an interlocking plate and an interlocking wheel, the interlocking plate has a guide hole, the guide hole is for the pressing column of the side plate to extend into, the interlocking plate A fixed piece is combined with the interlocking wheel to rotate synchronously. The replaceable drum brake gap automatic compensation device as described in item 1 of the patent application scope, wherein the side plate extends from the swing arm. The replaceable drum brake gap automatic compensation device as described in item 1 of the patent application scope, wherein the outer circumferential wall of the bearing sleeve utilizes a difference in size and diameter to form a stopper portion, and the linking plate is placed in a rotatable sleeve on the The smaller diameter portion is in contact with the stop portion from one side. The replaceable drum brake clearance automatic compensation device as described in item 1 of the patent application scope, wherein the interlocking wheel system is coupled to the outer peripheral wall of the bearing sleeve by a hole in a tight fit manner. The replaceable drum brake gap automatic compensation device as described in item 1 of the patent application scope, wherein the linkage plate has a screw hole, the linkage wheel has a through hole, and the fixing member is a screw member, so that the fixing member can pass through The screw hole is screwed into the screw hole through the through hole, so that the linkage plate and the linkage wheel form a synchronous rotation. The replaceable drum brake gap automatic compensation device as described in item 1 of the scope of the patent application, further includes an abutment piece, the abutment piece has an abutment end to cooperate with the outer peripheral surface of the rotating shaft, and the abutment piece One end has an abutting portion, and the end surface of the adjusting cylinder abuts the abutting portion. The replaceable drum brake gap automatic compensation device as described in item 6 of the patent application scope, wherein the outer peripheral surface of the adjusting cylinder has a ring groove, the abutment has a ring groove, and a ring body is interposed between the ring groove and the ring In the ditch. The replaceable drum brake gap automatic compensation device as described in item 6 of the patent application scope, wherein the outer peripheral surface of the abutment has a shell tube, the shell tube has a flange protruding in the inner diameter direction, and the bearing The outer peripheral wall of the sleeve is provided with an insertion groove, and the flange is fitted into the insertion groove. The replaceable drum brake clearance automatic compensation device as described in item 1 of the patent application scope also includes a brake wire, one end of the brake wire is coupled to the second end of the screw.

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