Friction plate wear detection device and brake caliper assembly

Abstract

The application relates to the brake technology field and provides a friction plate wear detection device and a brake caliper assembly. The friction plate wear detection device comprises a plurality of detectors which are distributed at the circumferential periphery of a pair of friction plates of a brake caliper at intervals, each of the detectors comprises a connecting piece and a probe, two ends of the connecting piece are connected with back plates of the pair of friction plates respectively, and the probe is connected with the body of the connecting piece; a plurality of alarms are arranged correspondingly with the plurality of detectors, the probe is suspended and inserted into the alarm from the opening end of the alarm; wherein, with the movement of any end of the connecting piece, the body of the connecting piece drives the probe to move, the probe contacts the inner wall of the alarm, and the alarm alarms. Through the cooperation of the detector and the alarm, the detection of the overwear, uneven wear and other wear conditions of the friction plate can be realized simply and effectively.

Description

Technical Field

[0001] This invention relates to the field of braking technology, and more specifically, to a friction pad wear detection device and a brake caliper assembly. Background Technology

[0002] Brake calipers are critical components of automotive braking systems. They work by using pistons to push a pair of friction pads against the brake disc, generating braking force. Over time, these friction pads wear down and require inspection to ensure braking reliability.

[0003] Currently, the wear condition of friction plates is usually determined by measuring the thickness of the friction plate and comparing it with the initial thickness. However, this method is difficult to implement and has complex logic, making it impossible to easily and effectively detect the wear of friction plates.

[0004] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of the present invention, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0005] In view of this, the present invention provides a friction pad wear detection device and a brake caliper assembly, which can easily and effectively detect wear conditions such as over-wear and uneven wear of friction pads through the cooperation of a detector and an alarm.

[0006] According to one aspect of the present invention, a friction pad wear detection device is provided, comprising: a plurality of detectors spaced apart around a pair of friction pads of a brake caliper, each detector including a connector and a probe, the two ends of the connector being respectively connected to the back plates of the pair of friction pads, and the probe being connected to the body of the connector; a plurality of alarms corresponding to the plurality of detectors, the probe extending into the alarm from its open end; wherein, as any end of the connector moves, the body of the connector drives the probe to move, and the alarm sounds when the probe contacts the inner wall of the alarm.

[0007] The aforementioned friction pad wear detection device utilizes multiple detectors and multiple alarms spaced around the circumference of a pair of friction pads on a brake caliper to achieve multi-point detection of the friction pads, enabling timely detection of wear. Each detector includes a connector whose two ends are respectively connected to the back plates of a pair of friction pads, and a probe connected to the body of the connector. Movement at any end of the connector can move the probe, thus transmitting changes in the position of any friction pad. The probe extends into the alarm; when it contacts the inner wall of the alarm, it indicates that the wear of the corresponding friction pad has reached a set limit value (this could be uniform wear of a pair of friction pads, wear on one side of any friction pad, or the difference in wear between the two sides reaching a limit value). The alarm then sounds, reporting the wear status of the friction pads.

[0008] Therefore, the aforementioned friction plate wear detection device, through the cooperation of the detector and the alarm, can easily and effectively detect wear conditions such as over-wear and uneven wear of the friction plate.

[0009] In some embodiments, the probe and the inner wall of the alarm are made of conductive material, and the probe and the inner wall of the alarm are electrically connected by wires.

[0010] Thus, when the probe contacts the inner wall of the alarm, a conductive path is formed between the probe and the alarm, triggering the alarm and enabling a simple and effective detection of wear conditions such as over-wear and uneven wear on the friction plate.

[0011] In some embodiments, the open end of the alarm is provided with an insulating sealing ring, through which the probe passes and is movably supported by the insulating sealing ring.

[0012] The insulating sealing ring serves two purposes: it provides insulation and isolation, and it supports the probe, ensuring that the probe does not contact the inner wall of the alarm if the friction plate is not worn or if the wear has not reached its limit.

[0013] In some embodiments, the outer wall of the alarm is provided with an insulating outer shell.

[0014] An insulated casing is used to prevent the alarm from interfering with other devices.

[0015] In some embodiments, the connector is a torsion spring, with its two ends respectively connected to the back plates of the pair of friction plates, and the probe connected to the body of the torsion spring; wherein the torsion spring is compressed when the friction plates are pushed against the brake disc and when the friction plates wear.

[0016] By utilizing the structure of a torsion spring, with its two ends connected to the back plates of a pair of friction pads and the body connected to a probe, when the friction pads wear, the torsion spring is compressed and deformed, causing the probe to move and transmitting the positional change of the friction pads due to wear. In this minimalist structure of torsion spring compression + probe movement, the wear conditions of the friction pads, such as over-wear and uneven wear, can be detected. In addition, by utilizing the elasticity of the torsion spring, when the friction pads are pushed against the brake disc, the torsion spring is compressed, so that when the brake is released, the torsion spring can drive the friction pads to return to their original position. This integrates the functions of friction pad return and wear detection, simplifying the structural design of the brake caliper assembly.

[0017] In some embodiments, the probe is movably riveted to the body of the torsion spring.

[0018] The movable riveting allows the probe to swing around the riveting point. When the friction plate wears on one side, the torsion spring causes the probe to deflect, thus detecting uneven wear of the friction plate. Of course, when a pair of friction plates wears evenly, the torsion spring will cause the probe to contact the bottom wall of the alarm, thus achieving wear detection.

[0019] In some embodiments, the probe is integrally formed with the body of the torsion spring.

[0020] By using a one-piece molding process, the structural design of the detector is simplified. When the friction plate experiences unilateral or uniform wear, the torsion spring drives the probe to contact the side or bottom wall of the alarm, thereby detecting over-wearing, uneven wear, and other wear conditions of the friction plate.

[0021] In some embodiments, in the initial state, the distance between the probe and the bottom wall of the alarm is determined based on the symmetrical wear limit value of the pair of friction plates.

[0022] The distance between the probe and the bottom wall of the alarm is determined based on the symmetrical wear limit value of a pair of friction plates in the initial state. When the pair of friction plates wear evenly to the limit value, the probe contacts the bottom wall of the alarm as the position of the pair of friction plates changes due to wear, thus triggering the alarm.

[0023] In some embodiments, in the initial state, the distance between the probe and the sidewall of the alarm is determined based on the single-sided wear limit value and / or the wear difference limit value of the pair of friction plates.

[0024] During operation, brake calipers may experience uneven wear on one side of the friction pad due to various reasons. The initial distance between the probe and the sidewall of the alarm is determined based on the wear limit value of a pair of friction pads on one side. This ensures that when the wear of one side of the friction pad reaches its limit, the probe, following the positional change of the corresponding friction pad due to wear, contacts the sidewall of the alarm, triggering the alarm. Furthermore, besides determining whether to replace the friction pad by detecting whether one side has reached its wear limit, the need for replacement can also be determined by detecting whether the wear difference between the two sides of the friction pads has reached its limit (i.e., detecting asymmetrical wear). (In the initial state, the distance between the probe and the sidewall of the alarm is determined based on the wear difference limit value between the two sides of the pair of friction pads). This avoids irreversible damage to the brake disc and caliper caused by asymmetrical wear, reduces the significant waste of vehicle energy caused by asymmetrical wear, and saves on vehicle maintenance costs because only one side of the friction pad needs to be replaced. Alternatively, the distance between the probe and the sidewall of the alarm can be determined by simultaneously comparing the single-sided wear limit value and the wear difference limit value of a pair of friction plates; thus, the advantages of both single-sided wear limit value and wear difference limit value alarm mechanisms can be combined.

[0025] According to another aspect of the present invention, a brake caliper assembly is provided, the brake caliper assembly being provided with the above-described friction pad wear detection device.

[0026] The brake caliper assembly is equipped with the aforementioned friction pad wear detection device, which, through the cooperation of the detector and the alarm, can easily and effectively detect wear conditions such as over-wear and uneven wear of the friction pads.

[0027] The beneficial effects of this invention compared to the prior art include at least the following:

[0028] The friction pad wear detection device of the present invention achieves multi-point detection of the friction pads by means of multiple detectors and multiple alarms distributed at intervals around a pair of friction pads of a brake caliper, so as to detect the wear of the friction pads in a timely manner. The detector includes a connector that is connected to the back plate of a pair of friction pads at both ends, and a probe that is connected to the body of the connector. The movement of any end of the connector can drive the movement of the probe, so as to transmit the positional change of any friction pad caused by wear through the movement of the probe. The probe is suspended and extends into the alarm. When the probe contacts the inner wall of the alarm, it indicates that the wear of the corresponding friction pad has reached a set limit value (which may be uniform wear of a pair of friction pads reaching the limit value, wear of any friction pad on one side reaching the limit value, or wear difference between the two sides reaching the limit value). Then the alarm sounds to report the wear of the friction pads.

[0029] Therefore, the friction plate wear detection device of the present invention, through the cooperation of the detector and the alarm, can easily and effectively detect the wear conditions of friction plates such as over-wear and uneven wear.

[0030] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit the invention. Attached Figure Description

[0031] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention. It is obvious that the drawings described below are merely some embodiments of the invention, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0032] Figure 1 This diagram illustrates the structure of the friction pad wear detection device and the brake caliper in an embodiment of the present invention.

[0033] Figure 2 This diagram illustrates a pair of friction plates reaching their limit value under uniform wear in an embodiment of the present invention.

[0034] Figure 3 This diagram illustrates the limit value reached by the wear difference between the two sides of the friction plate in an embodiment of the present invention. Detailed Implementation

[0035] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to fully and completely convey the concept of the exemplary embodiments to those skilled in the art.

[0036] The accompanying drawings are merely illustrative of the invention and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and therefore repeated descriptions of them will be omitted. Some block diagrams shown in the drawings are functional entities and do not necessarily correspond to physically or logically independent entities. These functional entities can be implemented in software, in one or more hardware modules or integrated circuits, or in different network and / or processor devices and / or microcontroller devices.

[0037] Furthermore, in the description of this invention, the terms "upper," "lower," "left," "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0038] It should be noted that, unless otherwise specified, the embodiments of the present invention and the features in different embodiments can be combined with each other.

[0039] Figure 1 This illustrates the structure of the friction pad wear detection device in conjunction with the brake caliper. Figure 2 This shows the state where a pair of friction plates have worn down to their limit. Figure 3 This shows the state where the wear difference between the two sides reaches its limit; combined with Figures 1 to 3 As shown, the friction pad wear detection device provided in this embodiment of the invention includes:

[0040] Multiple detectors 22 are spaced apart around a pair of friction pads 11 of the brake caliper 10. Each detector 22 includes a connector 221 and a probe 222. The two ends of the connector 221 are respectively connected to the back plate 110 of the pair of friction pads 11, and the probe 222 is connected to the body of the connector 221.

[0041] Multiple alarms 24 are set up corresponding to multiple detectors 22, and probes 222 extend into the alarms 24 from the open end of the alarms 24.

[0042] As any end of the connector 221 moves, the body of the connector 221 drives the probe 222 to move, and when the probe 222 contacts the inner wall of the alarm 24, the alarm 24 sounds.

[0043] The friction pad wear detection device of this embodiment uses multiple detectors 22 and multiple alarms 24 spaced around the circumferential periphery of a pair of friction pads 11 of the brake caliper 10 to achieve multi-point detection of the friction pads 11, so as to detect the wear of the friction pads 11 in a timely manner. The detector 22 includes a connector 221 connected to the back plate 110 of a pair of friction pads 11 at both ends, and a probe 222 connected to the body of the connector 221. The movement of any end of the connector 221 can drive the probe 222 to move, so as to transmit the position change of any friction pad 11 through the movement of the probe 222. The probe 222 extends into the alarm 24. When the probe 222 contacts the inner wall of the alarm 24, it indicates that the wear of the corresponding friction pad 11 has reached the set limit value (it may be that the wear of a pair of friction pads 11 is uniform and reaches the limit value, it may be that the wear of any one friction pad 11 on one side reaches the limit value, or it may be that the wear difference between the two friction pads 11 reaches the limit value). Then the alarm 24 sounds an alarm to report the wear of the friction pad 11.

[0044] Therefore, the friction plate wear detection device of this embodiment, through the cooperation of the detector 22 and the alarm 24, can easily and effectively detect the wear conditions of the friction plate 11, such as over-wear and uneven wear.

[0045] In some embodiments, the inner walls of the probe 222 and the alarm 24 are made of conductive material, and the probe 222 is electrically connected to the inner wall of the alarm 24 via a wire 25.

[0046] The inner walls of probe 222 and alarm 24 can be made of metal or other suitable conductive materials. Through the conductive design of the inner walls of probe 222 and alarm 24, when probe 222 contacts the inner wall of alarm 24, a conductive path is formed between probe 222 and alarm 24, triggering alarm 24. This enables simple and effective detection of wear conditions such as over-wear and uneven wear on the friction plate 11.

[0047] The alarm 24 can be activated by transmitting an electrical signal to the vehicle controller, so that the vehicle controller can adjust the braking strategy according to the wear condition of the friction pad 11. The alarm 24 can also be activated by emitting audible and visual alarm information to remind the driver to check and replace the friction pad 11 in time.

[0048] In some embodiments, a contact-type detection device such as a pressure sensor may also be provided on the inner wall of the alarm 24. When the probe 222 contacts the inner wall of the alarm 24, the detection device detects the relevant signal, thereby triggering the alarm 24 to sound an alarm.

[0049] In some embodiments, the open end of the alarm 24 is provided with an insulating sealing ring 26, through which the probe 222 passes and is movably supported by the insulating sealing ring 26.

[0050] The insulating sealing ring 26 serves two purposes: firstly, it provides insulation and isolation; secondly, it supports the probe 222, ensuring that the probe 222 does not contact the inner wall of the alarm 24 unless the friction plate 11 is worn or the wear reaches its limit. The insulating sealing ring 26 is preferably made of rubber to provide a certain degree of deformation, allowing for... Figure 3 When the friction plate 11 is worn on one side (asymmetrical wear on both sides), the probe 222 swings and presses the insulating sealing ring 26 until the probe 222 contacts the side wall of the alarm 24.

[0051] In some embodiments, the outer wall of the alarm 24 is provided with an insulating housing 240.

[0052] The alarm 24 is mounted to the brake caliper 10 body through an insulating housing 240. The insulating housing 240 prevents the alarm 24 from interfering with other devices.

[0053] In some embodiments, the connector 221 is a torsion spring, with its two ends connected to the back plates 110 of a pair of friction plates 11, and the probe 222 connected to the body of the torsion spring; wherein, when the friction plates 11 are pushed against the brake disc 12 and when the friction plates 11 are worn, the torsion spring is compressed.

[0054] By utilizing the structure of a torsion spring, its two ends are respectively connected to the back plate 110 of a pair of friction plates 11 and the body is connected to the probe 222. When the friction plates 11 are worn, the torsion spring is compressed and deformed, which drives the probe 222 to move and transmit the positional change of the friction plates 11 caused by wear. In this way, the wear condition of the friction plates 11, such as over-wear and uneven wear, can be detected through the extremely simple structure of torsion spring compression and probe 222 movement.

[0055] For details, please refer to Figure 2 and Figure 3 As shown. When the pair of friction plates 11 wear evenly to their limit, the two ends 221a and 221b of the torsion spring are evenly compressed to squeeze the body of the torsion spring, causing the body of the torsion spring to move downward, thereby driving the probe 222 downward to contact the bottom wall of the alarm 24, triggering the alarm. The wear difference between the two friction plates 11 ( Figure 3 When the wear on the right side of a pair of friction plates 11 is greater than that on the left side, reaching the limit value, the right end 221b of the torsion spring is compressed, causing the connection point between the probe 222 and the torsion spring to be squeezed to the left. In this embodiment, the probe 222 can swing around the connection point with the torsion spring, thereby causing the probe 222 to swing to the right until it contacts the right wall of the alarm 24, triggering the alarm.

[0056] Furthermore, the return of the friction pad 11 plays a crucial role in reducing the drag force of the brake caliper 10, increasing the lifespan of the friction pad 11 and brake disc 12, and also helps improve vehicle fuel economy. Combined with... Figure 1 As shown, by utilizing the elasticity of the torsion spring, the friction pads 11 are pushed towards the brake disc 12 by the piston 13 during braking, at which time the two ends of the torsion spring are symmetrically compressed; when the brake is released, the pair of friction pads 11 return to their original position under the elastic force of the torsion spring, disengaging from the brake disc 12, thus reducing brake drag.

[0057] Thus, by using a torsion spring, the return and wear detection functions of the friction plate 11 can be integrated, simplifying the structural design of the brake caliper assembly.

[0058] In other embodiments, the connector 221 may also be formed as other components, as long as it can move the probe 222 as the position of any friction piece 11 changes, and preferably has deformation recovery capability to integrate the functions of returning the friction piece 11 to its original position and detecting wear.

[0059] In some embodiments, the probe 222 is movably riveted to the body of the torsion spring.

[0060] The probe 222 can swing around the rivet point through the movable riveting. When the friction plate 11 experiences unilateral wear (asymmetrical wear), the torsion spring drives the probe 222 to swing, thereby detecting the uneven wear of the friction plate 11. Of course, when a pair of friction plates 11 experience uniform wear, the torsion spring will drive the probe 222 to contact the bottom wall of the alarm, thereby achieving wear detection.

[0061] In some embodiments, the probe 222 is integrally formed with the body of the torsion spring.

[0062] By using one-piece molding, the structural design of the detector 22 is simplified. When the friction plate 11 experiences unilateral wear (asymmetric wear) or uniform wear, the torsion spring drives the probe 222 to contact the side wall / bottom wall of the alarm, thereby detecting the wear conditions of the friction plate 11, such as over-wear and eccentric wear.

[0063] In some embodiments, in the initial state, the distance between the probe 222 and the bottom wall of the alarm 24 is determined based on the symmetrical wear limit value of a pair of friction plates 11.

[0064] Combination Figure 1 and Figure 2 As shown, the distance between the probe 222 and the bottom wall of the alarm 24 in the initial state is determined according to the symmetrical wear limit value of a pair of friction plates 11 (i.e., the maximum allowable wear value under the condition that a pair of friction plates 11 wears uniformly). This enables the probe 222 to contact the bottom wall of the alarm 24 as the position of the pair of friction plates 11 changes due to wear when the wear of a pair of friction plates 11 reaches the limit value, thus triggering the alarm 24.

[0065] In some embodiments, in the initial state, the distance between the probe 222 and the sidewall of the alarm 24 is determined based on the single-sided wear limit value and / or the wear difference limit value of a pair of friction plates 11.

[0066] During operation, the brake caliper 10 may experience uneven wear on one side of the friction pad 11 due to various reasons. The initial distance between the probe 222 and the sidewall of the alarm 24 is determined based on the unilateral wear limit value of a pair of friction pads 11 (i.e., the maximum allowable wear value when one side of the friction pad 11 is worn). This ensures that when the wear of one side of the friction pad 11 reaches its limit, the probe 222 contacts the sidewall of the alarm 24 as the position of the corresponding friction pad 11 changes due to wear, triggering the alarm 24. In this embodiment, the unilateral wear limit value is preferably 1mm to 5mm, more preferably 2mm to 3mm.

[0067] In addition to the method mentioned above of determining whether the friction plate 11 needs to be replaced by detecting whether the friction plate 11 on one side is worn to its limit, such as... Figure 3As shown, in some embodiments, the need to replace the friction pads 11 can be determined by detecting whether the wear difference between the two friction pads 11 has reached its limit (i.e., detecting asymmetric wear). (That is, in the initial state, the distance between the probe 222 and the side wall of the alarm 24 is determined based on the limit value of the wear difference between the two sides of a pair of friction pads 11). This avoids irreversible damage to the brake disc 12 and brake caliper 10 caused by unilateral wear (asymmetric wear), reduces the significant waste of vehicle energy consumption caused by asymmetric wear, and saves vehicle maintenance costs because only one side of the friction pad 11 can be replaced. In this embodiment, the limit value of the wear difference between the two sides is preferably 1mm to 5mm, more preferably 2mm to 3mm. For example, if the limit value of the wear difference between the two sides is 2mm, and the thickness of the pair of friction pads 11 in the initial state is 10mm, then when one side of the friction pad 11 wears to 9mm and the other side of the friction pad 11 wears to 5mm, since 9mm-5mm=4mm>2mm, the alarm 24 is triggered.

[0068] In other embodiments, the distance between the probe 222 and the sidewall of the alarm 24 can be determined by simultaneously comparing the single-sided wear limit value and the wear difference limit value of a pair of friction plates 11 (for example, if one of them is reached first, the first alarm of the alarm 24 is triggered (e.g., a yellow light is turned on), and if both are reached, the second alarm of the alarm 24 is triggered (e.g., a red light is turned on)). Thus, the advantages of the single-sided wear limit value and the wear difference limit value alarm mechanism described above can be combined.

[0069] This invention also provides a brake caliper assembly, which is equipped with the friction pad wear detection device described in any of the above embodiments.

[0070] The brake caliper assembly is equipped with the aforementioned friction pad wear detection device. This device enables multi-point detection of the friction pads 11 via multiple detectors 22 and multiple alarms 24 spaced around the circumference of a pair of friction pads 11 on the brake caliper 10. This allows for timely detection of wear on the friction pads 11. Each detector 22 includes a connector 221 connected at both ends to the backplate 110 of a pair of friction pads 11, and a probe 222 connected to the body of the connector 221. Movement at any end of the connector 221 can move the probe 222, transmitting any positional change of the friction pad 11 due to wear. The probe 222 extends into the alarm 24. When the probe 222 contacts the inner wall of the alarm 24, it indicates that the wear of the corresponding friction pad 11 has reached a set limit value (this could be uniform wear of a pair of friction pads 11, wear on one side of any friction pad 11, or wear difference between the two sides of a pair of friction pads 11 reaching a limit value). The alarm 24 then sounds, reporting the wear status of the friction pad 11.

[0071] Therefore, by combining the detector 22 and the alarm 24, it is possible to easily and effectively detect wear conditions such as over-wear and uneven wear of the friction plate 11.

[0072] Furthermore, when a torsion spring is used as the connecting member 221, the elastic action of the torsion spring can drive the friction pad 11 back to its original position when the brake is released, thereby integrating the return and wear detection functions of the friction pad 11 and simplifying the structural design of the brake caliper assembly.

[0073] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the scope of protection of the present invention.

Claims

1. A friction plate wear detection device, characterized in that, include: Multiple detectors are spaced apart around a pair of friction pads of a brake caliper. Each detector includes a connector and a probe. The two ends of the connector are respectively connected to the back plate of the pair of friction pads, and the probe is connected to the body of the connector. Multiple alarms are configured corresponding to the multiple detectors, and the probe extends into the alarm from its open end; As any end of the connector moves, the body of the connector drives the probe to move, and when the probe contacts the inner wall of the alarm, the alarm sounds. The inner wall of the alarm includes a bottom wall for detecting symmetrical wear and a side wall for detecting uneven wear. In the initial state, the distance between the probe and the bottom wall of the alarm is determined according to the symmetrical wear limit value of the pair of friction plates, and the distance between the probe and the side wall of the alarm is determined according to the unilateral wear limit value and / or the wear difference limit value of the pair of friction plates. The connecting component is a torsion spring, with its two ends connected to the back plates of the pair of friction plates, and the probe connected to the body of the torsion spring. When the friction plates are pushed against the brake disc and when the friction plates are worn, the torsion spring is compressed to drive the probe to move.

2. The friction plate wear detection device as described in claim 1, characterized in that, The probe and the inner wall of the alarm are made of conductive material, and the probe and the inner wall of the alarm are electrically connected by a wire.

3. The friction plate wear detection device as described in claim 2, characterized in that, An insulating sealing ring is provided at the open end of the alarm, and the probe passes through and is movably supported by the insulating sealing ring.

4. The friction plate wear detection device as described in claim 2, characterized in that, The alarm is equipped with an insulating outer shell.

5. The friction plate wear detection device as described in claim 1, characterized in that, The probe is movably riveted to the body of the torsion spring.

6. The friction plate wear detection device as described in claim 1, characterized in that, The probe is integrally formed with the body of the torsion spring.

7. A brake caliper assembly, characterized in that, The brake caliper assembly is equipped with a friction pad wear detection device as described in any one of claims 1-6.

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