Replacement-free wear alarm and brake

Abstract

The utility model relates to a replacement-free wear alarm and a brake. Comprising a shell, a telescopic assembly, a feedback module and an output assembly, the feedback module feeds back the abrasion degree according to the telescopic amount of the telescopic assembly, the output assembly is used for outputting an output signal of the feedback module to the outside, and the telescopic assembly comprises a guide rod and an elastic piece; the guide rod is provided with a detection end arranged in the shell and an abutting end extending out of the shell to abut against a friction plate, the elastic piece is arranged at the abutting end, the feedback module comprises a PCB and an electric brush which are arranged in the shell, the electric brush is arranged at the detection end of the guide rod, a resistance layer is arranged on the PCB, and the resistance layer is arranged on the detection end of the guide rod. The electric brush is in sliding contact with the resistance layer, and the sliding direction is parallel to the telescopic direction of the guide rod. The abrasion alarm can be repeatedly used, the use cost is reduced, the guide rod drives the electric brush to be in sliding contact with the resistance layer of the PCB, and the abrasion degree of the friction plate can be monitored in real time according to the magnitude of an output voltage signal.

Description

Technical Field

[0001] The utility model relates to the technical field of brakes, in particular to a replacement-free wear alarm and a brake. Background Art

[0002] The braking system of a car is crucial to its safe driving. The braking system used in a car generally includes drum brakes and disc brakes. The brakes use friction braking. The friction pads will wear during use and increase the braking clearance between the friction pads and the brake discs. The increase in braking clearance will extend the braking preparation time, and the friction pads need to be replaced after they are worn to a certain extent. Brakes are generally equipped with friction pad wear alarm devices.

[0003] The wear alarms used in existing hydraulic disc brakes are all of the wear-off type. The installation and positioning of the wear alarm require the addition of installation holes or slots on the friction plate. Such installation holes or slots will destroy the structural strength of the friction plate itself and increase costs. There is another problem with installing the wear alarm on the friction plate. The friction plate is in contact with the brake disc, and the brake disc is at high temperature. The wear alarm needs to be made of high-temperature resistant materials, which places high demands on the wear alarm. In addition, the wear alarm will only send out an alarm signal when the friction plate is worn to the limit position, reminding you to replace the friction plate. The wear state of the friction plate cannot be continuously monitored, which poses certain safety hazards to vehicle driving. Therefore, there is an urgent need for a wear alarm and brake that does not require replacement to solve the above problems. Utility Model Content

[0004] In order to solve the above problems, on the one hand, the utility model provides a replacement-free wear alarm, including a shell, a telescopic component, a feedback module for feeding back the degree of wear according to the telescopic amount of the telescopic component, and an output component for outputting the output signal of the feedback module to the outside, the telescopic component including a guide rod and an elastic member, the guide rod having a detection end disposed in the shell and an abutting end extending out of the shell to abut against a friction plate, the elastic member being arranged at the abutting end, the feedback module including a PCB board and a brush disposed in the shell, the brush being arranged at the detection end of the guide rod, a resistance layer being arranged on the PCB board, the brush being in sliding contact with the resistance layer and the sliding direction being parallel to the telescopic direction of the guide rod.

[0005] Furthermore, the shell includes a detachably connected base and a guide seat, the base is provided with a mounting seat for mounting on the brake, the guide seat is provided with a chamber for accommodating the feedback module, the chamber is provided with a slide groove, and the detection end of the guide rod is movably connected to the slide groove.

[0006] Furthermore, the mounting seat is V-shaped, the V-shape is provided with an arc groove adapted to the oil inlet hole of the brake caliper body of the brake, and mounting holes are provided on two end legs of the V-shape.

[0007] Furthermore, the mounting surface of the mounting seat is perpendicular to the guide rod.

[0008] Furthermore, it also includes a bushing, which is arranged on the shell, and the guide rod passes through the bushing. The bushing is also provided with a dust cover, and the dust cover is connected to the shell.

[0009] Furthermore, an O-ring groove is provided on the outer side of the bushing, and a sealing ring can be provided in the O-ring groove.

[0010] Furthermore, the elastic member is sleeved on the guide rod, one end of the elastic member abuts against the limiting assembly of the guide rod, and the other end abuts against the shell.

[0011] Furthermore, the output assembly includes a cable electrically connected to the PCB board and a connector connected to an end of the cable, and the connector is provided with a first buckle and a second buckle for connecting to an external customer terminal.

[0012] On the other hand, the utility model also provides a brake, including a brake bracket, a brake caliper body, a friction plate and a wear alarm, wherein the brake caliper body and the friction plate are arranged on the brake bracket, and the wear alarm is the wear alarm described above, wherein the wear alarm is arranged on the brake caliper body and its guide rod is in contact with the friction plate.

[0013] Furthermore, a receiving groove is provided on the brake caliper body, the housing of the wear alarm is installed at the oil inlet end of the brake caliper body, the friction plate is arranged on the side away from the oil inlet end, and the guide rod passes through the receiving groove and presses on the friction plate.

[0014] Due to the adoption of the above technical solution, the utility model has the following beneficial effects compared with the prior art:

[0015] 1) The utility model provides a replacement-free wear alarm. The guide rod is directly against the steel back of the friction plate. The friction plate does not need additional processing. The guide rod is made of metal and is far away from high temperature sources. There is no need to worry about the high temperature resistance of the wear alarm. It can be reused to reduce the cost of use. The guide rod drives the brush to slide in contact with the resistance layer of the PCB board. The PCB board can output a corresponding voltage signal according to the position of the brush. The voltage signal can gradually increase or decrease as the brush moves on the resistance layer of the PCB board. The degree of wear of the friction plate can be monitored in real time according to the size of the voltage signal.

[0016] 2) The replacement-free wear alarm provided by the present invention has a first buckle and a second buckle provided on the connector of the output assembly, which can improve the connection reliability between the connector and the outside and improve the user experience of the wear alarm.

[0017] 3) In the brake provided by the utility model, the wear alarm is installed on the brake caliper body, and the guide rod directly presses on the friction plate. The friction plate can be abutted against the guide rod without processing, and the installation is convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 Schematic diagram of the structure of the replacement-free wear alarm provided in Example 1 Figure 1 ;

[0020] Figure 2 Schematic diagram of the structure of the replacement-free wear alarm provided in Example 1 Figure 2 ;

[0021] Figure 3 A cross-sectional view of the replacement-free wear alarm provided in Example 1;

[0022] Figure 4 Schematic diagram of the structure of the brake provided in Example 2 Figure 1 ;

[0023] Figure 5 Schematic diagram of the structure of the brake provided in Example 2 Figure 2 ;

[0024] Figure 6 This is a cross-sectional view of the brake provided in Example 2.

[0025] 1-guide rod; 2-feedback module; 21-PCB board; 22-brush; 23-drag piece; 24-guide block; 3-output assembly; 31-cable; 32-connector plug; 33-first buckle; 34-second buckle; 35-annular boss; 36-connector slot; 4-housing; 41-mounting seat; 411-mounting hole; 412-arc groove; 42-slide groove; 43-base; 44-guide seat; 5-bushing; 51-O-ring groove; 6-dust cover; 7-elastic part; 8-limiting assembly; 9-brake bracket; 10-brake caliper body; 101-oil inlet hole; 102-piston; 11-friction plate. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. In the drawings, the size and relative size of some parts may be enlarged for clarity.

[0027] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connection" and "connected" should be interpreted in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] In the description of the present invention, terms such as "upper", "lower", "left", "right", "front", "back", "center", "horizontal", "vertical", "top", "bottom", "inside" and "outside" and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of description and simplification of operation, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0029] In addition, in the description of the present invention, the terms "first" and "second" are only used to distinguish in the description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0030] Example 1

[0031] As the instruction manual Figure 1-3As shown, the utility model provides a replacement-free wear alarm, including a shell 4, a telescopic component, a feedback module 2 for feeding back the degree of wear according to the telescopic amount of the telescopic component, and an output component 3 for outputting the output signal of the feedback module 2 to the outside, the telescopic component includes a guide rod 1 and an elastic member 7, the guide rod 1 has a detection end disposed in the shell 4 and an abutment end extending out of the shell 4 to abut against a friction plate 11, the elastic member 7 is arranged at the abutment end, the feedback module 2 includes a PCB board 21 and a brush 22 arranged in the shell 4, the brush 22 is arranged at the detection end of the guide rod 1, a resistance layer is arranged on the PCB board 21, the brush 22 is in sliding contact with the resistance layer and the sliding direction is parallel to the telescopic direction of the guide rod 1.

[0032] Specifically, the wear alarm of the present application is mainly suitable for passenger cars. Through the cooperation of the retractable guide rod 1, the feedback module 2 and the output component 3, the wear alarm can be replaced without replacement. One end of the guide rod 1 is abutted against the friction plate 11. As the friction plate 11 wears, the elastic member 7 can drive the guide rod 1 to move in the direction close to the friction plate 11, and then drive the brush 22 to slide on the resistance layer of the PCB board 21. The brush 22 will output corresponding voltage signals at different positions on the resistance layer. When the brush 22 slides on the resistance layer, the output voltage signal gradually increases or decreases. The moving distance of the brush 22 is the same as the moving distance of the guide rod 1, that is, it is proportional to the degree of wear of the friction plate 11. The output voltage signal is linearly related to the degree of wear. The degree of wear of the friction plate 11 can be obtained by the obtained voltage signal, and then the degree of wear of the friction plate 11 can be monitored in real time. It is convenient to remind the owner to replace the friction plate 11 in time according to the degree of wear of the friction plate 11 to ensure driving safety.

[0033] Optimize the implementation method, as shown in the attached manual Figure 3As shown, the brush 22 is arranged at the detection end of the guide rod 1, the brush 22 is in sliding contact with the resistance layer on the PCB board 21, and the sliding direction is parallel to the extension and contraction direction of the guide rod 1, the output component 3 is electrically connected to the PCB board 21, the brush 22 is in sliding contact with the resistance layer on the PCB board 21 and is electrically connected, the brush 22, the PCB board 21 and the output component 3 form a loop; the PCB board 21 outputs a voltage signal during the sliding process of the brush 22, and the output voltage signal gradually increases or decreases with the sliding of the brush 22, the moving distance of the brush 22 is linearly related to the voltage signal, and the brush 22 moves with the extension and contraction of the guide rod 1, and the extension and contraction amount of the guide rod 1 is equivalent to the wear degree of the friction plate 11, that is, the wear degree of the friction plate 11 can be obtained through the output voltage signal, the wear degree of the friction plate 11 can be continuously monitored, the wear degree can be monitored in real time, and continuous alarm can be given. To ensure driving safety, the limit wear degree of the friction plate 11 and the voltage value corresponding to the limit wear degree are set. Under this set voltage value, the position of the brush 22 on the PCB board 21 is the limit position. When the measured voltage value reaches the set voltage value, the wear alarm will sound an alarm to remind the owner to replace the friction plate 11 in time. And the wear degree of the friction plate 11 can be obtained instantly according to the measured voltage value, which is convenient for timely replacement of the friction plate 11 under special needs.

[0034] As one of the specific implementations, carbon oil is printed on the PCB board 21 as a resistance layer, and when the brush 21 contacts the carbon oil, there is a corresponding resistance value. When the friction plate 11 is worn, the guide rod 1 is displaced along with the friction plate 11, and the PCB board converts the detected linear displacement change into a resistance value change. The linear displacement motion is converted into an electrical signal that is continuously monitored in real time. The voltage signal generated by the linear motion is directly proportional to the axial motion of the guide rod 1. Once the wear reaches the limit, the output voltage signal jumps. The voltage jump will trigger the relevant alarm device of the vehicle, reminding the driver that the total wear has reached the limit and the friction plate 11 must be replaced in time.

[0035] In an optimized implementation mode, the feedback module 2 also includes a drag piece 23, which is arranged on the guide rod 1, and the brush 22 is installed on the drag piece 23; specifically, the drag piece 23 is injection molded on the guide rod 1, the brush 22 is welded on the drag piece 23, and the brush 22 is electrically connected to the carbon oil on the PCB board 21.

[0036] Specifically, the working principle of the feedback module 2 is as follows: in the initial position, the brush 22 is on one side of the PCB board 21. When the guide rod 1 is gradually extended, it drives the brush 22 to slide to the other side on the PCB board 21. During the sliding process, a voltage signal is output. When the brush 22 slides to the extreme position of the PCB board 21, the output voltage signal jumps. The voltage jump will trigger the relevant alarm device of the vehicle to alarm, reminding the owner to replace the friction plate 11.

[0037] In an optimized implementation mode, the shell 4 includes a detachably connected base 43 and a guide seat 44, the base 43 is provided with a mounting seat 41 for mounting on the brake, the guide seat 44 is provided with a chamber for accommodating the feedback module 2, the chamber is provided with a slide groove 42, and the detection end of the guide rod 1 is movably connected to the slide groove 42.

[0038] Specifically, the shell 4 includes a base 43 and a guide seat 44, the guide seat 44 is installed on the base 43, the bottom of the guide seat 44 is inserted into the base 43, the mounting seat 41 is arranged on the base 43, the mounting seat 41 is V-shaped, the V-shape is provided with an arc groove 412 for matching with the oil inlet hole of the brake caliper body of the brake, and the end foot of the V-shape is provided with a mounting hole 411; preferably, the guide seat 44 is threaded or welded to the base 43.

[0039] As one of the specific implementations, the slide groove 42 is arranged in the guide seat 44, and the setting direction of the slide groove 42 is parallel to the extension direction of the guide rod 1. The guide rod 1 slides on the slide groove 42 through the guide block 24 so that the guide rod 1 can move smoothly in the shell 4.

[0040] In an optimized implementation, the mounting surface of the mounting seat 43 is perpendicular to the guide rod 1, and the base is in a 7-shape, with one end of the 7-shape connected to the guide seat and the other end connected to the output assembly. The mounting surface of the mounting seat 43 is perpendicular to the guide rod 1, which can effectively save the installation space of the wear alarm on the brake and reduce the volume of the brake.

[0041] The optimized implementation mode also includes a bushing 5, which is preferably a copper bushing. The bushing 5 is arranged at the opening of the shell 4, that is, the bushing 5 is arranged on the guide seat 44, and the guide rod 1 passes through the bushing 5. The bushing 5 is also provided with a dust cover 6, and the dust cover 6 is connected to the guide seat 44. One end of the guide rod 1 is used to abut against the friction plate 11 and extends out of the guide seat 44. The dust cover 6 is provided to prevent dust from entering the shell 1.

[0042] In an optimized implementation manner, the elastic member 7 is preferably a spring, which is sleeved on one end of the guide rod 1 extending out of the guide seat 44 , one end of the spring abuts against the limit assembly 8 of the guide rod 1 , and the other end abuts against the shell 4 .

[0043] In an optimized implementation mode, the limiting assembly 8 includes a retaining ring, a retaining ring groove is provided on the guide rod 1, and the retaining ring is positioned in the retaining ring groove; preferably, a gasket may also be provided on the side of the retaining ring facing the spring.

[0044] As one of the specific implementations, a bushing 5 is positioned on the guide seat 44 by injection molding, and the assembly process is reduced by injection molding. Of course, this process can also be completed by interference fit or bonding. An O-ring groove 51 is provided on the outside of the bushing 5, and an O-ring can be provided in the O-ring groove 51. The O-ring is pressed between the guide seat 44 and the bushing 5 to fill the gap between the bushing 5 and the guide seat 44, so that the bushing 5 and the guide seat 44 are sealed to protect the inside of the housing 1 from water. The bushing 5 is the main load-bearing member of the guide rod 1. One end of the spring abuts against the surface of the dust cover 6, and the other end presses on the gasket. The retaining ring is positioned in the retaining ring groove of the guide rod 1 to prevent the gasket 1 from falling. In this way, the spring extends outward against the guide rod 1.

[0045] In an optimized implementation manner, the output component 3 includes a cable 31 electrically connected to the feedback module 2 and a connector 32 connected to an end of the cable 31 , and a fastening component is provided on the connector 32 .

[0046] In an optimized implementation manner, the connector 32 is used to connect to an external device such as a display device or an alarm device, and the fastening assembly includes a first buckle 33 and a second buckle 34 for external fastening, and the first buckle 33 and the second buckle 34 are respectively arranged on the two side walls of the connector 32, and the first buckle 33 and the second buckle 34 can be engaged with the external device to improve the connection reliability between the connector 32 and the external device; preferably, there are two second buckles 34, and the second buckles 34 are arranged along the insertion direction of the connector 32, and can also play a guiding role.

[0047] In an optimized implementation manner, the connector end of the connector 32 is provided with an annular boss 35 , a connector slot 36 is provided on the annular boss 35 , and the first buckle 33 and the second buckle 34 are provided on the outer wall of the annular boss 35 .

[0048] Preferably, one end of the connector 32 away from the connector socket 36 is a tapered structure, and the connector 32 is integrally injection molded and has good strength.

[0049] In the initial position, the guide rod 1 abuts against the friction plate 11, and the guide rod 1 is pushed to the bottom under the compression of the friction plate 11. At this time, the spring is in a compressed state, and the brush 22 is electrically connected to the PCB board 21. When the friction plate 11 is worn, the guide rod 1 will move toward the friction plate 11 under the elastic action of the spring, thereby driving the brush 22 to slide on the PCB board 21 and outputting a corresponding voltage signal. When the friction plate 11 is worn to the bottom, the voltage signal jumps and an alarm is sounded to remind you to replace the friction plate 11. After the friction plate 11 is replaced, the guide rod 1 can be pushed to the initial position.

[0050] Example 2

[0051] As the instruction manual Figure 4-6 As shown, the utility model also provides a brake, including a brake bracket 9, a brake caliper body 10, a friction plate 11 and a wear alarm, wherein the brake caliper body 10 and the friction plate 11 are arranged on the brake bracket 9, and the wear alarm is the wear alarm described in Example 1, wherein the wear alarm is arranged on the brake caliper body 10 and its guide rod 1 abuts against the friction plate 11, and the guide rod 1 directly abuts against the friction plate 11, and there is no need to perform hole processing on the friction plate 11, thereby reducing damage to the friction plate, and increasing the contact area between the guide rod and the friction plate, thereby improving the accuracy of the wear alarm.

[0052] The brake in this embodiment is a hydraulic brake. The brake caliper body 10 is provided with an oil inlet hole 101. The wear alarm is installed on the side of the oil inlet hole 101 through the mounting seat 41. The oil inlet hole 101 protrudes out of the brake caliper body 10. The arc groove 412 is adapted to the oil inlet hole 101. The wall surface of the arc groove 412 is in contact with the oil inlet hole 101. The oil inlet hole 101 can be used to position the mounting seat 41, thereby improving the installation efficiency and accuracy of the wear alarm on the brake caliper body 10, and improving the connection reliability between the mounting seat 41 and the brake caliper body 10. The guide rod 1 of the wear alarm is against the friction plate 11. The guide rod 1 is pushed to the bottom (i.e., the initial position) under the compression of the friction plate 11. The brush 22 of the wear alarm is in electrical contact with the carbon oil of the PCB board 21, and the wear alarm is in a conducting state.

[0053] In an optimized implementation manner, a receiving groove is provided on the brake caliper body 10, and the wear alarm is installed on the oil inlet end of the brake caliper body 10 through a mounting seat 41. The mounting surface of the mounting seat 41 is in surface contact with the brake caliper body 10, which can improve the connection strength between the wear alarm and the brake caliper body 10. The friction plate 11 is arranged on the side away from the oil inlet end, and the guide rod 1 passes through the receiving groove and is pressed against the friction plate 11.

[0054] When the brake friction pad is worn, the piston 102 of the brake caliper body 10 moves the friction pad 11 on the brake bracket 9 forward. Under the return elastic force of the spring, the guide rod 1 follows the guide rod 1 to move outward.

[0055] When the brake friction pad is continuously worn, the piston 102 continues to push the friction pad 11 forward under the push of the brake fluid. During the pushing process, the brush 22 slides on the PCB board 21 along with the guide rod and outputs a voltage signal. When the friction pad 11 is worn to the design value, the guide rod 1 is pulled to the top under the return force of the spring, and the owner is reminded to replace the friction pad according to the output jump voltage signal; or, the guide rod 1 is pulled to the top, the brush 22 on the guide rod 1 is separated from the PCB board 21, forming a short circuit, and the alarm light in the cab is lit, prompting the driver to replace the friction pad 11.

[0056] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0057] Those skilled in the art will appreciate that the present invention can be implemented in many other specific forms without departing from the spirit and scope of the present invention. Although the embodiments of the present invention have been described, it should be understood that the present invention should not be limited to this embodiment, and those skilled in the art can make changes and modifications within the spirit and scope of the present invention as defined by the attached claims.

Claims

1. A replacement-free wear alarm, comprising a housing, a telescopic component, a feedback module for feeding back the degree of wear according to the telescopic amount of the telescopic component, and an output component for outputting an output signal of the feedback module to the outside, It is characterized in that The telescopic assembly includes a guide rod and an elastic member, the guide rod has a detection end placed in the shell and an abutment end extending out of the shell to abut against the friction plate, the elastic member is arranged at the abutment end, the feedback module includes a PCB board and a brush arranged in the shell, the brush is arranged at the detection end of the guide rod, a resistance layer is arranged on the PCB board, the brush is in sliding contact with the resistance layer and the sliding direction is parallel to the telescopic direction of the guide rod.

2. The replacement-free wear alarm according to claim 1, It is characterized in that The shell includes a detachably connected base and a guide seat, the base is provided with a mounting seat for mounting on the brake, the guide seat is provided with a chamber for accommodating the feedback module, the chamber is provided with a slide groove, and the detection end of the guide rod is movably connected to the slide groove.

3. The replacement-free wear alarm according to claim 2, It is characterized in that The mounting seat is V-shaped, and the V-shape is provided with an arc groove adapted to the oil inlet hole of the brake caliper body of the brake, and mounting holes are provided on two end legs of the V-shape.

4. The replacement-free wear alarm according to claim 3, It is characterized in that The mounting surface of the mounting seat is perpendicular to the guide rod.

5. The replacement-free wear alarm according to claim 1, It is characterized in that It also includes a bushing, which is arranged on the shell, and the guide rod passes through the bushing. The bushing is also provided with a dust cover, and the dust cover is connected to the shell.

6. The replacement-free wear alarm according to claim 5, It is characterized in that An O-ring groove is arranged on the outer side of the bushing, and a sealing ring can be arranged in the O-ring groove.

7. The replacement-free wear alarm according to claim 1, It is characterized in that The elastic member is sleeved on the guide rod, one end of the elastic member abuts against the limiting assembly of the guide rod, and the other end abuts against the shell.

8. The replacement-free wear alarm according to claim 1, It is characterized in that The output assembly includes a cable electrically connected to the PCB board and a connector connected to the end of the cable, and the connector is provided with a first buckle and a second buckle for connecting to an external customer terminal.

9. A brake, comprising a brake bracket, a brake caliper body, a friction pad and a wear alarm, wherein the brake caliper body and the friction pad are arranged on the brake bracket, It is characterized in that The wear alarm is the wear alarm according to any one of claims 1 to 8, and the wear alarm is arranged on the brake caliper body and its guide rod is in contact with the friction plate.

10. The brake according to claim 9, It is characterized in that The brake caliper body is provided with a receiving groove, the housing of the wear alarm is installed at the oil inlet end of the brake caliper body, the friction plate is arranged on a side away from the oil inlet end, and the guide rod passes through the receiving groove and presses on the friction plate.

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