Automatic testing device and method for clearance of disc brake

Abstract

The invention relates to a disc brake clearance automatic testing device and method, and the device comprises a to-be-tested disc brake, an air chamber push rod stroke measuring unit and a control unit, the to-be-tested disc brake is internally provided with a pressure sensor, the air chamber push rod stroke measuring unit comprises an air chamber, an air cylinder, an air chamber push rod and a force sensor, and the air cylinder is provided with a displacement sensor. And the control unit at least comprises a control module for sending a control instruction and an acquisition module for acquiring data of each sensor. The brake clearance of the disc brake is determined by processing pressure sensor data, force sensor data and displacement sensor data. Manual measurement is not needed, manual input is reduced, and the problem that manual measurement is poor in accuracy and consistency is solved. Besides, according to the brake clearance measurement method, measurement is carried out when data of the displacement sensor tends to be stable, and compared with a filler gauge measurement method, the measurement result of clearance measurement is more accurate.

Description

Technical Field

[0001] The invention relates to the technical field of automobile brakes, and in particular to a disc brake clearance automatic testing device and method. Background Art

[0002] Disc brakes are an important part of the automobile braking system, and their performance directly affects the safety of the vehicle. As one of the key parameters for measuring the performance of disc brakes, accurate measurement of brake clearance is of great significance. However, at present, all domestic third-party professional testing agencies mainly rely on manual operation to test the clearance of disc brakes, using feeler gauges for manual measurement.

[0003] In the process of implementing the prior art, the inventor discovered that:

[0004] The traditional feeler gauge measurement method is limited by the accuracy of the measuring tool itself and cannot meet the needs of high-precision measurement. Moreover, since each tester has different feelings and operating techniques for the feeler gauge, the results measured by different testers often have large errors, making it difficult to ensure the consistency and accuracy of the measurement results. In addition, manual measurement requires a lot of manpower, which not only increases the company's operating costs, but also reduces work efficiency.

[0005] Therefore, the present application provides a technical solution for automated clearance testing of disc brakes with low manpower investment, high precision, and guaranteed accuracy and consistency of measurement results, so as to solve the problems existing in the prior art of manual measurement using a feeler gauge, such as the accuracy of the feeler gauge itself, different test results from different testers, and large manpower investment in manual measurement. Summary of the invention

[0006] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0007] The present invention is proposed in view of the above-mentioned problems.

[0008] Therefore, the technical problem solved by the present invention is that the prior art manual measurement using a feeler gauge has problems such as the accuracy of the feeler gauge itself, different test results from different testers, and large manpower investment in manual measurement.

[0009] In order to solve the above technical problems, the present invention is solved by the following technical solutions:

[0010] A disc brake clearance automated testing device comprises a disc brake to be tested, an air chamber push rod stroke measuring unit connected to the disc brake to be tested, and a control unit connected to the air chamber push rod stroke measuring unit. A pressure sensor is arranged in the disc brake to be tested. The air chamber push rod stroke measuring unit comprises an air chamber, a cylinder arranged at one end of the air chamber, and an air chamber push rod arranged at the other end of the air chamber and connected to the disc brake to be tested. The air chamber is provided with a force sensor at the air chamber push rod installation position. The cylinder is installed with a displacement sensor for measuring the displacement of the cylinder push rod. The control unit at least comprises a control module for issuing control instructions to the air chamber push rod stroke measuring unit and an acquisition module for acquiring pressure sensor data, force sensor data, and displacement sensor data.

[0011] As a preferred solution of the automatic disc brake clearance testing device described in the present invention, the air chamber specifically comprises: an upper end cover; a lower end cover; and an air chamber diaphragm is provided between the upper end cover and the lower end cover.

[0012] As a preferred solution of the automatic disc brake clearance testing device described in the present invention, a groove protruding toward the lower end cover is provided at the center of the air chamber diaphragm; one end of the air chamber diaphragm is connected to the air chamber push rod, and the other end is connected to the cylinder push rod; the air chamber push rod is also provided with an air chamber spring between the upper end cover and the groove of the air chamber diaphragm.

[0013] The present invention also provides a disc brake clearance automated testing method, which specifically comprises the following steps:

[0014] The control module sends a control instruction to control the air chamber push rod of the air chamber push rod stroke measurement unit to push the disc brake to be tested, and obtains the pressure sensor data, force sensor data and displacement sensor data during braking;

[0015] The pressure sensor data, the force sensor data and the displacement sensor data are processed using a clearance data calculation model to determine the brake clearance of the disc brake to be tested.

[0016] As a preferred solution of the automatic test method for the clearance of a disc brake according to the present invention, the control instruction at least includes:

[0017] Controlling the air chamber push rod stroke measurement unit to push the disc brake to be tested under the air pressure of the first air chamber, and obtaining the first pressure sensor data, the first force sensor data and the first displacement sensor data when the disc brake to be tested is braked under the air pressure of the first air chamber;

[0018] Controlling the air chamber push rod stroke measurement unit to push the disc brake to be tested under the air pressure of the second air chamber, and obtaining the second pressure sensor data, the second force sensor data and the second displacement sensor data when the disc brake to be tested is braked under the air pressure of the second air chamber;

[0019] Controlling the air chamber push rod stroke measurement unit to push the disc brake to be tested under the air pressure of the third air chamber, and obtaining the third pressure sensor data, the third force sensor data and the third displacement sensor data when the disc brake to be tested is braked under the air pressure of the third air chamber;

[0020] Wherein, when the second pressure sensor data, the second force sensor data and the second displacement sensor data obtained under the air pressure of the second air chamber meet the preset conditions, braking of the disc brake to be tested under the air pressure of the third air chamber is performed;

[0021] The third pressure sensor data, the third force sensor data and the third displacement sensor data are pressure sensor data, force sensor data and displacement sensor data.

[0022] As a preferred solution of the automatic test method for disc brake clearance of the present invention, the preset conditions at least include:

[0023] The phase difference of the displacement values ​​sensed by the displacement sensor continuously tends to 0;

[0024] The number of times that the displacement value difference approaches 0 continuously is not less than 200 times.

[0025] As a preferred solution of the automatic test method for the clearance of a disc brake according to the present invention, a clearance data calculation model is used to process the pressure sensor data, the force sensor data and the displacement sensor data to determine the brake clearance of the disc brake to be tested, specifically including:

[0026] Substituting the force sensor data and the displacement sensor data into a clearance calculation formula to calculate the brake clearance of the disc brake to be tested;

[0027] The gap calculation formula specifically includes:

[0028] PadGap = Ls2 / Cpg+Er;

[0029] Among them, the PadGap is used to represent the calculated brake clearance of the disc brake to be tested, the Ls2 is used to represent the displacement value of the displacement sensor data; the Cpg is used to represent the gap constant corresponding to the disc brake to be tested; and the Er is used to represent the rigidity error of the disc brake to be tested.

[0030] As a preferred solution of the automatic disc brake clearance testing method described in the present invention, when controlling the air chamber push rod stroke measuring unit to push the disc brake to be tested under the air pressure of the third air chamber, and obtaining the third pressure sensor data, the third force sensor data and the third displacement sensor data when the disc brake to be tested is braked under the air pressure of the third air chamber, it also includes: setting the thrust of the air chamber push rod detected by the force sensor to 0.2KN.

[0031] As a preferred solution of the automatic disc brake clearance testing method of the present invention, the disc brake to be tested is braked no less than three times under the air pressure of the third air chamber.

[0032] Beneficial effects of the present invention: The present application provides an automated disc brake clearance testing device and method, which can obtain the pressure sensor data inside the disc brake to be tested, the force sensor data of the air chamber at the installation position of the air chamber push rod, and the displacement sensor data of the cylinder push rod in the cylinder when the disc brake to be tested is braking by controlling the air chamber push rod stroke measurement unit through the control unit, and determine the brake clearance of the disc brake by processing the acquired data. Compared with the previous manual test of the brake clearance of the disc brake, the present application does not require manual measurement, which reduces the labor input and reduces the problems of poor accuracy and consistency due to manual measurement. In addition, the brake clearance measurement method in the present application performs measurement when the displacement sensor data tends to be stable. Compared with the feeler gauge measurement method, the measurement result of the clearance measurement in the present application is more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0034] Figure 1 This is a schematic structural diagram of a disc brake clearance automatic testing device according to an embodiment of the present application;

[0035] Figure 2 The present invention is a flowchart of a test method for an automated disc brake clearance test method according to an embodiment of the present application.

[0036] Figure 3 A disc brake clearance automated testing method according to an embodiment of the present application Figure 2 Another flow chart of S100 is shown in FIG.

[0037] Figure 4 This is a gap self-adjustment curve diagram described in an embodiment of the present application.

[0038] Figure 5 This is a diagram showing the relationship between the input force, clamping force, and air chamber push rod stroke described in the embodiment of the present application.

[0039] The parts indicated by the numbers in the accompanying drawings are as follows:

[0040] 100-An automatic test device for disc brake clearance;

[0041] 1-disc brake to be tested; 11-pressure sensor;

[0042] 2-air chamber push rod stroke measurement unit; 22-air chamber; 221-upper end cover; 222-lower end cover; 223-air chamber diaphragm; 2231-groove; 224-air chamber spring; 225-force sensor; 23-cylinder; 231-cylinder push rod; 2311-displacement sensor; 24-air chamber push rod;

[0043] 3-control unit; 31-control module; 32-acquisition module. DETAILED DESCRIPTION

[0044] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the drawings of the specification. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in the art without creative work should fall within the scope of protection of the present invention.

[0045] like Figure 1 As shown, an automatic disc brake clearance test device 100 includes a disc brake 1 to be tested, an air chamber push rod stroke measuring unit 2 connected to the disc brake 1 to be tested, and a control unit 3 connected to the air chamber push rod stroke measuring unit 2. The disc brake 1 to be tested is provided with a pressure sensor 11. The air chamber push rod stroke measuring unit 2 includes an air chamber 22, a cylinder 23 provided at one end of the air chamber 22, and an air chamber push rod 24 provided at the other end of the air chamber 22 and connected to the disc brake 1 to be tested. The air chamber 22 is provided with a force sensor 225 at the installation position of the air chamber push rod 24. The cylinder 23 is installed with a displacement sensor 2311 for measuring the displacement of the cylinder push rod 231. The control unit 3 at least includes a control module 31 for issuing a control instruction to the air chamber push rod stroke measuring unit 2 and an acquisition module 32 for acquiring data of the pressure sensor 11, the force sensor 225, and the displacement sensor 2311.

[0046] Specifically, the disc brake clearance automatic testing device is used to automatically measure the brake clearance of the disc brake.

[0047] The air chamber push rod stroke measuring unit 2 is the displacement value of the air chamber push rod 24 stroke when the air chamber push rod 24 pushes the disc brake to achieve braking. Specifically, the air chamber 22 is used to store compressed air to provide power for the air chamber push rod 24, including: an upper end cover 221; a lower end cover 222; and an air chamber diaphragm 223 is provided between the upper end cover 221 and the lower end cover 222.

[0048] A groove 2231 protruding toward the lower end cover 222 is provided at the center of the air chamber diaphragm 223; one end of the air chamber diaphragm 223 is connected to the air chamber push rod 24, and the other end is connected to the cylinder push rod 231. The air chamber push rod 24 is also provided with an air chamber spring 224 between the upper end cover 221 and the groove 2231 of the air chamber diaphragm 223. Specifically, in the initial state, the air chamber spring 224 is installed in the groove 2231 of the air chamber diaphragm 223 to push against the air chamber diaphragm 223, and the other end of the air chamber diaphragm 223 is pushed against by the cylinder push rod 231. The spring force is greater than the thrust of the cylinder push rod 231, thereby ensuring that the subsequent cylinder push rod 231 is always in contact with the air chamber diaphragm 223 when it is ejected or retracted. In this way, the displacement of the air chamber push rod 24 can be obtained by the displacement of the cylinder push rod 231.

[0049] The control module 31 in the control unit 3 is mainly used to control the air chamber push rod stroke measurement unit 2 to act according to the control instruction. Specifically, the control module 31 described here can be a proportional valve and a pneumatic actuator, which drives the cylinder push rod 231 through the proportional valve and the pneumatic actuator, so that the air chamber push rod 24 connected to the air chamber diaphragm 223 is displaced, and then the disc brake connected to the air chamber push rod 24 is braked.

[0050] In addition, the control unit 3 also includes an acquisition module 32 for acquiring data from the pressure sensor 11, the force sensor 225, and the displacement sensor 2311. Specifically, the brake clearance of the disc brake is determined by the data acquired by the acquisition module 32. It can be understood that the data of the pressure sensor 11 in the disc brake is used to determine whether the disc brake has been clamped to achieve braking, that is, the pressure sensor 11 determines the clamping force through the measured pressure, and determines whether the disc brake has achieved braking through the clamping force. The thrust of the air chamber push rod 24 is determined by the force sensor 225 at the installation position of the air chamber push rod 24 of the air chamber 22, and then the magnitude of the input force of the air chamber push rod 24 is determined. The displacement of the cylinder push rod 231 is determined by the displacement sensor 2311 of the cylinder 23. It should be noted that the displacement of the cylinder push rod 231 is equal to the displacement of the air chamber push rod 24, that is, the displacement of the air chamber push rod 24 is indirectly measured by the displacement sensor 2311.

[0051] It should also be noted that the control unit 3 is also provided with a processing module and other modules such as a power supply module, etc. The processing module processes the acquired data to determine the brake clearance of the disc brake, and the power supply module is used to realize the power on and off of the control module 31.

[0052] In an actual application scenario provided in the present application, a control module 31 of the control unit 3 issues a control instruction to enable the air chamber push rod 24 of the air chamber push rod stroke measurement unit 2 to push the disc brake to achieve braking. When braking is achieved, the acquisition module 32 of the control unit 3 acquires data from the pressure sensor 11, the force sensor 225, and the displacement sensor 2311, and processes them through the processing module of the control unit 3 to determine the braking clearance of the disc brake.

[0053] In addition, the present application also provides a disc brake clearance automated testing method, which specifically includes the following steps:

[0054] S100: Control the air chamber push rod 24 of the air chamber push rod stroke measurement unit 2 through the control instruction issued by the control module 31 to push the disc brake 1 to be tested, and obtain the pressure sensor 11 data, the force sensor 225 data and the displacement sensor 2311 data during braking.

[0055] Specifically, in order to accurately calculate the brake clearance of the disc brake later, the control instruction in this application performs the disc brake braking in multiple times to ensure its accuracy. The control of the control instruction includes at least the following steps:

[0056] S110: Control the air chamber push rod stroke measurement unit 2 to push the disc brake 1 to be tested under the first air chamber pressure, and obtain the first pressure sensor 11 data, the first force sensor 225 data and the first displacement sensor 2311 data when the disc brake 1 to be tested is braked under the first air chamber pressure.

[0057] Specifically, the disc brake is mainly used to eliminate the tolerance gap between machines under the first air chamber pressure. In the present application, the first air chamber pressure is set to 3 bar, and at least one action is performed to eliminate the tolerance gap. The first air chamber pressure is the air pressure of the air chamber.

[0058] S120: Control the air chamber push rod stroke measurement unit 2 to push the disc brake 1 to be tested under the air pressure of the second air chamber, and obtain the data of the second pressure sensor 11, the second force sensor 225 and the second displacement sensor 2311 when the disc brake 1 to be tested is braked under the air pressure of the second air chamber.

[0059] Specifically, the disc brake is braked under the air pressure of the second air chamber mainly to allow the disc brake to self-adjust so that the brake clearance of the disc brake tends to be stable, thereby ensuring the accuracy of the brake clearance finally measured. In this application, the air pressure of the second air chamber is set to 1 bar, and at least 200 actions are performed. The air pressure of the second air chamber is the air pressure of the air chamber.

[0060] In the present application, the braking of the disc brake under the air pressure of the second air chamber is set with a preset condition, and it should be understood that the setting of the preset condition is mainly used for the braking clearance of the disc brake to be stable. That is, when the data of the second pressure sensor 11, the data of the second force sensor 225, and the data of the second displacement sensor 2311 obtained under the air pressure of the second air chamber meet the requirement that the braking clearance of the disc brake is stable, the braking of the disc brake 1 to be tested under the air pressure of the third air chamber is performed.

[0061] The preset conditions in the present application at least include: the phase difference of the displacement values ​​sensed in the displacement sensor 2311 continuously approaches 0; and the number of times the phase difference of the displacement values ​​continuously approaches 0 is not less than 200 times.

[0062] like Figure 4 As shown in FIG. 1 , the self-adjustment of the disc brake under the second air chamber pressure allows the clearance to stabilize. It should be noted that Figure 4 The horizontal direction in the middle indicates the number of braking times, and the vertical direction indicates the stroke displacement value of the air chamber push rod 24, that is, the displacement value of the displacement sensor 2311. It can be seen that under the air pressure of the second air chamber, after no less than 200 braking times, the displacement value of the displacement sensor 2311 tends to be stable, and accordingly, the braking clearance of the disc brake also tends to be stable. It should also be pointed out that Figure 4 The brake data of S120 is also included.

[0063] S130: Control the air chamber push rod stroke measurement unit 2 to push the disc brake 1 to be tested under the air pressure of the third air chamber, and obtain the data of the third pressure sensor 11, the third force sensor 225 and the third displacement sensor 2311 when the disc brake 1 to be tested is braked under the air pressure of the third air chamber.

[0064] Specifically, after the brake clearance of the disc brake is stabilized in step S120, the disc brake is braked by the air pressure of the third air chamber, and the data of the third pressure sensor 11, the data of the third force sensor 225 and the data of the third displacement sensor 2311 are obtained. In the present application, the air pressure of the first air chamber is set to 2 bar, and the action is performed at least once. It can be understood that after multiple brakings are performed in step S120 to achieve the brake clearance being stabilized, the brake clearance of the disc brake can be calculated more accurately by the data of the third pressure sensor 11, the data of the third force sensor 225 and the data of the third displacement sensor 2311 obtained in step S130.

[0065] Furthermore, when controlling the air chamber push rod stroke measuring unit 2 to push the disc brake 1 to be tested under the air pressure of the third air chamber, and obtaining the data of the third pressure sensor 11, the third force sensor 225 and the third displacement sensor 2311 when the disc brake 1 to be tested is braked under the air pressure of the third air chamber, it also includes: setting the thrust of the air chamber push rod 24 detected by the force sensor 225 to 0.2KN.

[0066] Specifically, the thrust of the air chamber push rod 24 detected by the force sensor 225 is set to 0.2KN, that is, the thrust of the air chamber push rod 24 is 0.2KN, that is, the thrust of the air chamber diaphragm 223 and the air chamber push rod 24 by the cylinder push rod 231 after overcoming the elastic force of the spring at the other end of the air chamber diaphragm 223 is 0.2KN.

[0067] like Figure 5 As shown, it is a relationship diagram between input force, clamping force and stroke of air chamber push rod 24. Input force is the data detected by force sensor 225, clamping force is the data detected by pressure sensor 11, and stroke of air chamber push rod is the data detected by displacement sensor 2311. The upper line in the figure is the relationship diagram between input force and stroke of air chamber push rod 24, and the lower line is the relationship diagram between input force and clamping force. It can be seen that the upper line is basically linear after the input force is a certain value point between 0 and 1, and the lower line is basically linear. That is, it can be understood that the brake clearance of the disc brake can be calculated at the position where the input force and air chamber push rod 24, input force and clamping force are all in linear relationship. In this application, it is preferred to calculate the brake clearance of the disc brake when the input force is 0.2KN, that is, the thrust is 0.2KN.

[0068] Furthermore, the disc brake 1 to be tested is braked at least three times under the air pressure of the third air chamber. That is, in order to ensure the accuracy of the brake clearance, the acquisition module 32 acquires data for at least the third time for subsequent processing.

[0069] S200: using a clearance data calculation model to process the data of the pressure sensor 11, the data of the force sensor 225 and the data of the displacement sensor 2311 to determine the brake clearance of the disc brake 1 to be tested.

[0070] Specifically, the clearance calculation model can be understood as a processing module in the control unit 3 for calculating the brake clearance of the disc brake.

[0071] Further, the data of the pressure sensor 11, the data of the force sensor 225 and the data of the displacement sensor 2311 are processed by a clearance data calculation model to determine the brake clearance of the disc brake 1 to be tested, which specifically includes: substituting the data of the force sensor 225 and the data of the displacement sensor 2311 into a clearance calculation formula to calculate the brake clearance of the disc brake 1 to be tested; wherein the clearance calculation formula specifically includes:

[0072] PadGap = Ls2 / Cpg+Er;

[0073] Among them, the PadGap is used to represent the calculated brake clearance of the disc brake 1 to be tested, the Ls2 is used to represent the displacement value of the displacement sensor 2311 data; the Cpg is used to represent the gap constant corresponding to the disc brake 1 to be tested; and the Er is used to represent the rigidity error of the disc brake 1 to be tested.

[0074] Specifically, the displacement value of the displacement sensor 2311 data is the displacement value of the air chamber push rod 24 when the input force is 0.2KN under the air pressure of the third air chamber. It should be pointed out that the data of the displacement sensor 2311 and the force sensor 225 are used in the above gap calculation formula, and the data of the pressure sensor 11 is not used. However, it should be understood that the data of the pressure sensor 11 is the premise of the gap calculation formula, that is, the pressure sensor 11 determines the clamping force through the measured pressure, thereby determining the braking, ensuring that the gap calculation of the disc brake is based on the braking. The gap constant corresponding to the disc brake 1 to be tested can be understood as a product design constant. It should be understood that different disc brakes have different product design parameters, as shown in Table 1 below, which are product design constants for different products. In addition, different disc brakes have different rigidity errors, and Table 1 also lists the rigidity errors of different products.

[0075]

[0076] Table 1

[0077] The present application provides a disc brake clearance automated testing method, which can be specifically performed as follows:

[0078] Before testing, check whether the data of pressure sensor 11, force sensor 225, and displacement sensor 2311 are returned to 0. If not, calibrate and adjust to 0.

[0079] After the adjustment is completed, the control module 31 selects the corresponding disc brake control command for testing:

[0080] A disc brake braking action is performed with an air chamber pressure of 3 bar to eliminate the tolerance gap between the machines, and the data of the first pressure sensor 11, the first force sensor 225 and the first displacement sensor 2311 are obtained.

[0081] The disc brake is braked 200 times with a chamber pressure of 1 bar, and the data of the second pressure sensor 11, the second force sensor 225 and the second displacement sensor 2311 are obtained until the clearance is stabilized by the self-adjustment process of the disc brake. Figure 4 The gap self-adjustment curve diagram is shown.

[0082] When the brake clearance tends to be stable, the disc brake braking action is performed three times with an air chamber pressure of 2 bar, and data from the third pressure sensor 11, data from the third force sensor 225, and data from the third displacement sensor 2311 are obtained.

[0083] It should be noted that when the disc brake braking action is performed three times at a pressure of 2 bar, the input force of the air chamber push rod 24 is set to 0.2 KN, that is, the input force detected by the force sensor 225 is 0.2 KN.

[0084] The disc brake clearance is calculated by substituting the data of the third pressure sensor 11, the data of the third force sensor 225 and the data of the third displacement sensor 2311 into the clearance calculation formula. Figure 5 As shown, it is a relationship diagram between the input force, the clamping force, and the stroke of the air chamber push rod 24. You can also choose a position where the input force and the clamping force and the input force and the stroke of the air chamber push rod 24 are all in a linear relationship for calculation.

[0085] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A disc brake clearance automatic testing device, characterized in that: The invention comprises a disc brake to be tested, an air chamber push rod stroke measuring unit connected to the disc brake to be tested, and a control unit connected to the air chamber push rod stroke measuring unit. A pressure sensor is arranged in the disc brake to be tested. The air chamber push rod stroke measuring unit comprises an air chamber, a cylinder arranged at one end of the air chamber, and an air chamber push rod arranged at the other end of the air chamber and connected to the disc brake to be tested. The air chamber is provided with a force sensor at the air chamber push rod installation position. The cylinder is installed with a displacement sensor for measuring the displacement of the cylinder push rod. The control unit at least comprises a control module for issuing control instructions to the air chamber push rod stroke measuring unit and an acquisition module for acquiring pressure sensor data, force sensor data, and displacement sensor data.

2. The disc brake clearance automatic testing device according to claim 1, characterized in that: The air chamber specifically comprises: an upper end cover; a lower end cover; and an air chamber diaphragm is arranged between the upper end cover and the lower end cover.

3. The disc brake clearance automatic testing device according to claim 2, characterized in that: The center of the air chamber diaphragm is provided with a groove protruding toward the lower end cover; One end of the air chamber diaphragm is connected to the air chamber push rod, and the other end is connected to the cylinder push rod. The air chamber push rod is also provided with an air chamber spring between the upper end cover and the groove of the air chamber diaphragm.

4. A disc brake clearance automated testing method, characterized in that: The specific steps include: The control module sends a control instruction to control the air chamber push rod of the air chamber push rod stroke measurement unit to push the disc brake to be tested, and obtains the pressure sensor data, force sensor data and displacement sensor data during braking; The pressure sensor data, the force sensor data and the displacement sensor data are processed using a clearance data calculation model to determine the brake clearance of the disc brake to be tested.

5. The disc brake clearance automated testing method according to claim 4, characterized in that: The control instructions at least include: Controlling the air chamber push rod stroke measurement unit to push the disc brake to be tested under the air pressure of the first air chamber, and obtaining the first pressure sensor data, the first force sensor data and the first displacement sensor data when the disc brake to be tested is braked under the air pressure of the first air chamber; Controlling the air chamber push rod stroke measurement unit to push the disc brake to be tested under the air pressure of the second air chamber, and obtaining the second pressure sensor data, the second force sensor data and the second displacement sensor data when the disc brake to be tested is braked under the air pressure of the second air chamber; Controlling the air chamber push rod stroke measurement unit to push the disc brake to be tested under the air pressure of the third air chamber, and obtaining the third pressure sensor data, the third force sensor data and the third displacement sensor data when the disc brake to be tested is braked under the air pressure of the third air chamber; Wherein, when the second pressure sensor data, the second force sensor data and the second displacement sensor data obtained under the air pressure of the second air chamber meet the preset conditions, braking of the disc brake to be tested under the air pressure of the third air chamber is performed; The third pressure sensor data, the third force sensor data and the third displacement sensor data are pressure sensor data, force sensor data and displacement sensor data.

6. The disc brake clearance automated testing method according to claim 5, characterized in that: The preset conditions at least include: The phase difference of the displacement values ​​sensed by the displacement sensor continuously tends to 0; The number of times that the displacement value difference approaches 0 continuously is not less than 200 times.

7. The automatic disc brake clearance testing method according to claim 4, characterized in that: The pressure sensor data, the force sensor data and the displacement sensor data are processed using a clearance data calculation model to determine the brake clearance of the disc brake to be tested, specifically including: Substituting the force sensor data and the displacement sensor data into a clearance calculation formula to calculate the brake clearance of the disc brake to be tested; The gap calculation formula specifically includes: PadGap = Ls2 / Cpg+Er; Among them, the PadGap is used to represent the calculated brake clearance of the disc brake to be tested, the Ls2 is used to represent the displacement value of the displacement sensor data; the Cpg is used to represent the gap constant corresponding to the disc brake to be tested; and the Er is used to represent the rigidity error of the disc brake to be tested.

8. The disc brake clearance automated testing method according to claim 5, characterized in that: When the air chamber push rod stroke measurement unit is controlled to push the disc brake to be tested under the air pressure of the third air chamber to achieve braking, and the third pressure sensor data, the third force sensor data and the third displacement sensor data are obtained when the disc brake to be tested is braked under the air pressure of the third air chamber, it also includes: The thrust of the air chamber push rod detected by the force sensor is set to 0.2KN.

9. The automatic disc brake clearance testing method according to claim 5, characterized in that: The disc brake to be tested is braked no less than three times under the air pressure of the third air chamber.

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