Device and method for measuring dragging torque of electromechanical brake caliper assembly

Abstract

The invention discloses a device and a method for measuring dragging torque of an electronic mechanical brake caliper assembly, and belongs to the technical field of automobile brake system testing. The device comprises a first supporting seat, a driving rotating shaft, a brake disc and a driven rotating shaft assembly with a torque sensor, and precise positioning of a caliper support is achieved through cooperation of a rotating clamp and a guide pin. During testing, the calipers clamp the brake disc firstly to output clamping force and then release pressure, the motor drives the brake disc to rotate by a circle to eliminate inertia moment, and then the torque sensor dynamically collects dragging torque. A modularized brake disc fixing seat is adopted to adapt to products of different specifications, a coupler compensates for shafting offset, a fixing block locking mechanism guarantees non-measurement state safety, and inertia errors are eliminated in combination with a dynamic and static friction separation measurement method. According to the scheme, the problems of positioning deviation, mechanical interference and friction interference in a traditional test are solved, and the measurement precision and efficiency of the dragging torque of the brake calipers are remarkably improved.

Description

Technical Field

[0001] The invention relates to the technical field of automobile brake system testing, and in particular to a device and method for measuring the drag torque of an electronic mechanical brake caliper assembly. Background Art

[0002] With the accelerated evolution of automobile electrification and intelligence, traditional electronic parking brake (EPB) systems are difficult to meet the stringent requirements of high-level autonomous driving for the response speed, energy efficiency and control accuracy of the braking system. The EPB system relies on hydraulic pipelines to transmit braking force, resulting in a high response delay and the risk of brake fluid leakage. It is difficult to adapt to the integration requirements of the wire-controlled chassis. After the EPB is released, due to the elastic deformation of the sealing ring and the residual mechanical return clearance, the drag torque generally exceeds 3.5N·m, causing energy loss and overheating of the brake disc. The separate design of the hydraulic unit and the electronic control module leads to a 30%-40% increase in weight, which restricts the improvement of the cruising range of new energy vehicles. With the development of automotive electronics, the electronic mechanical brake system (EMB) has gradually become an industry trend due to its advantages such as fast response and high control accuracy. Brake drag, as a key indicator affecting the performance of the brake system, is directly related to abnormal wear of the brake pads, increased vehicle energy consumption and the service life of the brake system. The traditional mechanical brake system achieves brake release through hydraulic pipeline pressure relief, while the electronic mechanical brake caliper drives the actuator through an electronic control signal. The measurement of the drag torque after the brake is released faces new technical challenges.

[0003] The current industrialization process of EMB calipers is facing the dual challenges of testing standards and process verification systems. Traditional hydraulic brake test benches rely on hydraulic pressure closed-loop control, while EMB calipers need to receive digital instructions through the CAN bus. There are generational differences in the signal interface protocols of the two. The problem of lagging in the formulation of industry standards also needs to be solved urgently. In October 2024, China Automotive Research Institute and Fige Technology jointly issued the first domestic group standard "Performance Requirements and Bench Test Methods for Passenger Car Electronic Mechanical Brake Caliper Assemblies". Today, the automotive industry is also in urgent need of research on the drag torque device and test methods of the electronic mechanical brake caliper assembly. Summary of the invention

[0004] The purpose of the present invention is to provide a device and method for accurately measuring the drag torque of an electronic mechanical brake caliper, so as to solve the measurement deviation problem caused by positioning error, inertial interference and other factors in traditional testing.

[0005] Electromechanical brake caliper assembly drag torque measuring device, including a first support seat and a first support frame. An active rotating shaft is placed inside the first support seat. The active rotating shaft is connected to a brake disc. There is a caliper around the brake disc. The caliper is installed on a caliper support. The caliper support can be fixed on a driven rotating shaft assembly. The driven rotating shaft assembly is connected to a torque sensor. There is a support notch in the center of the caliper support. The support notch can extend into a rotating clamp. The rotating clamp is driven by a cylinder and fixes the caliper support on a reference fixing plate. A guide pin is provided in the hole of the reference fixing plate. The guide pin can be driven by a driving device. Brake drag means that after the driver completely releases the brake pedal, the braking of the vehicle cannot be immediately released or cannot be completely released, and there is still a relatively strong drag torque. This test device is used for testing the drag torque of the brake disc. In the initial stage, the caliper will clamp the brake disc. After a period of time, the caliper releases pressure, and the active rotating shaft starts to rotate to drive the brake disc to rotate. The caliper will receive a certain drag torque and finally transfer the force to the caliper support. The caliper support then transfers the force to the driven rotating shaft assembly. The torque sensor is used to read the torque value on the driven rotating shaft assembly, so as to obtain the drag torque data generated by the brake disc in a certain period of time. The first support seat is used to place the active rotating shaft, and the second support frame is used to stabilize the torque sensor. The caliper is connected to the caliper support through a transition sleeve. The caliper support is convenient for the handling mechanism to grab and move it to the specified position. The rotating clamp is driven by a cylinder. The outside of the cylinder is supported by three cylinder fixing brackets. Driven by the cylinder, the rotating clamp rotates to position the caliper support on the reference fixing plate. The reference fixing plate and the guide pin are used to accurately position the caliper support, ensuring that the caliper is installed at the specified position for testing. The driving device is used for the horizontal movement of the guide pin.

[0006] For the electromechanical brake caliper assembly drag torque measuring device, the driven rotating shaft assembly includes a driven rotating shaft. The driven rotating shaft is installed inside the second support seat. One end of the driven rotating shaft is coaxially connected to the torque sensor, and the other end is fastened with three cylinder fixing brackets. The other ends of two of the cylinder fixing brackets are connected to the reference fixing plate. The driving device is installed on the side of the second support seat. The driving device includes a pneumatic push rod and a pull plate. The telescopic direction of the pneumatic push rod is parallel to the axial direction of the guide pin. A notch matching the guide pin is provided at the edge of the pull plate. A return spring is provided inside the guide pin. There is a driving device on each side of the second support seat. When the caliper support needs to be moved to the specified position, the pneumatic push rod drives the pull plate to move horizontally towards the sensor side. The pull plate drives the pin baffle to move horizontally towards the sensor side, preventing interference and collision with the caliper support during the movement of the caliper support. After the caliper support moves to the specified position, the pneumatic push rod pushes the pull plate to drive the pin baffle to move horizontally towards the brake disc side. The guide pin will pass through the corresponding hole of the reference fixing plate due to the action of the return spring and finally extend into the support positioning hole of the caliper support, so as to accurately position the caliper support. The guide pins on both sides of the second support seat prevent the caliper support from shifting, facilitating the subsequent fixing of the position of the caliper support by the rotating clamp.

[0007] Electromechanical brake caliper assembly drag torque measuring device. There is a support positioning hole on the caliper support, and the guide pin can axially extend into the support positioning hole. As shown in the figure, the rotating clamp is in the loosened state when vertical and in the locked state when horizontal. When the caliper support is fitted to the reference fixed plate with the handling device, the rotating clamp is in the loosened state and will pass through the support notch. The guide pins on both sides of the second support seat extend into the support positioning hole under the action of the internal return spring to position the caliper support. Then the rotating clamp rotates to lock the caliper support on the reference fixed plate. Then the guide pins are withdrawn from the support positioning hole, and the handling device releases the force. The caliper will bear the drag torque during the test, and the drag torque will be transmitted to the caliper support. Withdrawing the guide pins from the support positioning hole is to avoid affecting the measurement of the drag torque.

[0008] Electromechanical brake caliper assembly drag torque measuring device. The driving rotating shaft is connected to the brake disc fixing seat through a transition connecting sleeve. There is a keyway structure between the transition connecting sleeve and the brake disc fixing seat to maintain coaxiality. The test device needs to test brake discs of different sizes during the test. Brake discs of different sizes correspond to brake disc fixing seats of different sizes. The brake disc fixing seat is convenient for disassembly and installation on the transition connecting sleeve. The transition connecting sleeve can be used as an intermediate component to fill the difference in the diameters of the driving rotating shaft and the brake disc fixing seat and achieve reliable connection.

[0009] Electromechanical brake caliper assembly drag torque measuring device. A fixing block is threadedly connected to the end of the driving rotating shaft. There is a sliding groove in the middle of the fixing block, and a sliding block is embedded in the sliding groove. The sliding block is slidably matched with the side wall of the first support seat and is locked by a knob. The fixing block is used to fix the driving rotating shaft in the non-measurement state to prevent the driving rotating shaft from deviating due to gravity or vibration, resulting in an initial position deviation between the brake disc and the caliper. In the non-working state, the sliding block is inserted into the fixing block notch and locked by the knob to ensure that the driving rotating shaft will not rotate in the non-working state and ensure the safety of the operator in the non-working state. Other personnel can judge whether the device is in the pre-working state by observing the knob state, which is convenient for personnel to manage and check the equipment.

[0010] Electromechanical brake caliper assembly drag torque measuring device. A motor is fixedly installed on the first support frame. The motor has a motor output shaft, and the motor output shaft and the driving rotating shaft are jointly connected to a coupling. The coupling smoothly transmits the power from the motor output shaft to the driving rotating shaft to ensure the normal operation of the entire device. Due to factors such as manufacturing and installation errors or thermal expansion and vibration during operation, there may be axial, radial or angular offsets between the two shafts. The coupling can compensate for these offsets to ensure the normal connection and power transmission of the two shafts.

[0011] Electromechanical brake caliper assembly drag torque measuring device. The caliper is provided with a power-on port, which is used to receive an external control signal to drive the clamping or releasing action of the caliper. When the caliper releases the brake disc, the brake disc can rotate freely under the drive of the driving rotating shaft, and the drag torque of the caliper is measured by a torque sensor.

[0012] Electromechanical brake caliper assembly drag torque measuring device. The first support seat and the first support frame are connected to the moving plate at the threaded bottom. The moving plate is provided with positioning holes, and the moving plate is connected to the bottom plate through the positioning holes. There are connection holes corresponding to the positioning holes on the bottom plate. The connection holes of the bottom plate are designed through calculation. By sequentially connecting the positioning holes and the connection holes of the bottom plate with screws according to the positions of the connection holes, the positions of the first support seat and the first support frame can be adjusted, and finally the central axes of the driving rotating shaft and the driven rotating shaft can be aligned to ensure the experimental accuracy of the test device.

[0013] Electromechanical brake caliper assembly drag torque measuring method. First, start the driving device to move the guide pin out of the reference fixing plate, and the caliper support fits the reference fixing plate. Release the driving device to let the guide pin reset and extend into the caliper support for positioning. Second step, control the rotating clamp to rotate and lock the caliper support to the reference fixing plate. Third step, control the caliper assembly to output a clamping force, and after clamping for 5 s, release the pressure to zero. Fourth step, start the motor to drive the driving rotating shaft to drive the brake disc to rotate. Fifth step, after the brake disc starts to rotate stably, measure and record the maximum drag torque during the rotation of the first and tenth circles through the torque sensor. The torque sensor data recorded in the first circle is actually the static torque of the brake disc when the vehicle starts. The EMB caliper relies on an external motor to drive the friction plate to clamp or release the brake disc. The drag torque in the first circle directly reflects the execution efficiency of the external motor's reverse return. If the external motor control signal is delayed or there is an idle stroke in the mechanical transmission, it may cause the friction plate not to completely disengage from the brake disc, and the torque in the first circle will be significantly exceeded. The piston return of the EMB caliper relies on mechanical transmission (such as a ball screw or a rack and pinion mechanism), rather than the elastic rebound of the seal ring of the hydraulic system. The data in the first circle can detect whether the reverse movement of the screw is in place and whether the initial separation gap between the friction plate and the brake disc meets the standard. The torque sensor data recorded in the tenth circle is to detect the stable performance of the caliper system after multiple operations. The friction plate of the caliper may gradually lose contact due to the vibration or centrifugal force generated by the rotation of the brake disc. The data in the tenth circle can verify whether this self-adjusting ability is effective. The continuous rotation of the brake disc may slightly increase the temperature, resulting in thermal expansion or plastic deformation of metal components. If the drag torque in the tenth circle exceeds the standard, it can reflect such problems. The EMB caliper usually has an automatic compensation function for friction plate wear. Continuously rotating 10 circles can verify whether the compensation mechanism over-regulates (such as the compensation screw being accidentally locked) under dynamic conditions, resulting in too small a gap between the friction plate and the brake disc. Specifically, it can be found by observing the test data. Generally, the drag torque value below 2 N·m is normal.

[0014] The advantages of the present invention are as follows: Through the collaborative positioning mechanism of the rotating clamp and the guide pin, combined with the reference fixing plate and the driving device, precise positioning and rapid locking of the caliper support are achieved, avoiding measurement errors caused by positioning deviations during the test. At the same time, the detachable design of the guide pin effectively eliminates its interference with torque transmission, ensuring the accuracy of data acquisition. The modular structure design, such as the cooperation of the transition connecting sleeve and the keyway, and the replaceable brake disc fixing seat, significantly improves the compatibility of the device with brake discs of different sizes and enhances the test versatility. The test method collects dynamic friction state data after rotating one week, effectively avoiding the interference of static friction and inertial torque. Combined with the coaxial connection of the torque sensor and the driven rotating shaft, the measurement accuracy is further optimized. The overall device has a compact structure and flexible adjustment. The adjustable position design of the support seat ensures the alignment of the driving and driven rotating shafts. The pneumatic drive and the caliper power supply port with automatic control achieve efficient coordination of the test process, improving the test efficiency while providing a high-precision solution for the standardized evaluation of the drag torque of the braking system. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only exemplary, and those of ordinary skill in the art can also obtain other implementation drawings based on the provided drawings without creative efforts.

[0016] Figure 1 It is a schematic diagram of the overall measurement device of the present invention.

[0017] Figure 2 It is a side view of the measurement device of the present invention.

[0018] Figure 3 It is a schematic diagram of the caliper and the caliper support of the present invention.

[0019] Figure 4 It is a schematic diagram of the driven rotating shaft assembly and the guide pin of the present invention.

[0020] Figure 5 It is a schematic diagram of the guide pin extending into the positioning hole of the support, and the reference fixing plate is not shown in the figure.

[0021] Figure 6 It is a schematic diagram of the caliper support installed on the driven rotating shaft assembly of the present invention.

[0022] Figure 7 It is a partial enlarged schematic diagram of the connection between the driving rotating shaft and the brake disc of the present invention.

[0023] Description of the drawings: 1 - First support base, 2 - First support frame, 3 - Brake disc, 4 - Driven rotating shaft assembly, 5 - Caliper support, 6 - Second support frame, 7 - Second support base, 8 - Driving device, 9 - Guide pin, 11 - Driving rotating shaft, 12 - Transition connecting sleeve, 13 - Brake disc fixing base, 14 - Fixed block, 15 - Sliding block, 16 - Knob, 21 - Motor, 22 - Coupling, 23 - Moving plate, 24 - Base plate, 41 - Driven rotating shaft, 42 - Cylinder, 421 - Rotating clamp, 422 - Cylinder fixing bracket, 43 - Reference fixing plate, 51 - Support notch, 52 - Support positioning hole, 53 - Caliper, 54 - Power-on port, 55 - Transition sleeve, 61 - Torque sensor, 81 - Pneumatic push rod, 82 - Pulling plate, 91 - Pin baffle, 211 - Motor output shaft, 231 - Positioning hole. Detailed implementation mode

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0025] Embodiment 1: Refer to the attached Figure 1 、attached Figure 2 、attached Figure 3 、attached Figure 4 、attached Figure 6 As shown in the attached drawings, a drag torque measuring device for an electro-mechanical brake caliper assembly includes a first support base 1 and a first support frame 2. A driving rotating shaft 11 is placed inside the first support base 1. The driving rotating shaft 11 is connected to a brake disc 3. There is a caliper 53 around the brake disc 3. The caliper 53 is installed on a caliper support 5. The caliper support 5 can be fixed on a driven rotating shaft assembly 4. The driven rotating shaft assembly 4 is connected to a torque sensor 61. There is a support notch 51 in the center of the caliper support 5. The support notch 51 can extend into a rotating clamp 421. The rotating clamp 421 is driven by a cylinder 42 and fixes the caliper support 5 on a reference fixing plate 43. A guide pin 9 is provided in the hole of the reference fixing plate 43. The guide pin 9 can be driven by a driving device 8.

[0026] Refer to the attached Figure 1 、attached Figure 2 、attached Figure 4 、attached Figure 5 、attached Figure 6As shown, this test device is used for testing the drag torque of the brake disc 3. In the initial stage, the caliper 53 clamps the brake disc 3. After a period of time, the caliper 53 is depressurized, and the driving rotating shaft 11 starts to rotate to drive the brake disc 3 to rotate. The caliper 53 will receive a certain drag torque and finally transmit the force to the caliper support 5, and the caliper support 5 transmits the force to the driven rotating shaft assembly 4. The torque sensor 61 is used to read the torque value on the driven rotating shaft assembly 4, so as to obtain the drag torque data generated by the brake disc 3 in a certain period of time. The first support 1 is used to place the driving rotating shaft 11, and the second support frame 6 is used to stabilize the torque sensor 61. The caliper 53 is connected to the caliper support 5 through a transition sleeve 55, and the caliper support 5 is convenient for the handling mechanism to carry and grab to the designated position. The rotary clamp 421 is driven by a cylinder 42 and can rotate to position the caliper support 5 on the reference fixing plate 43. The reference fixing plate 43 and the guide pin 9 are used to accurately position the caliper support 5 to ensure that the caliper 53 is installed at the designated position for testing. The driving device 8 is used for the horizontal movement of the guide pin 9.

[0027] Refer to the attached Figure 2 , attached Figure 3 , attached Figure 4 , attached Figure 6 As shown, for the drag torque measuring device of the electro-mechanical brake caliper assembly, the driven rotating shaft assembly 4 includes a driven rotating shaft 41. The driven rotating shaft 41 is installed in the second support 7. One end of the driven rotating shaft 41 is coaxially connected to the torque sensor 61, and three cylinder fixing brackets 422 are fixed at the other end. The cylinder fixing brackets 422 are connected to a reference fixing plate 43. The driving device 8 is installed on the side of the second support 7. The driving device 8 includes a pneumatic push rod 81 and a pull plate 82. The telescopic direction of the pneumatic push rod 81 is parallel to the axial direction of the guide pin 9. A notch matching the guide pin 9 is provided at the edge of the pull plate 82, and a return spring is provided inside the guide pin 9. There is a driving device 8 on each side of the second support 7. When the caliper support 5 is to be moved to the designated position, the pneumatic push rod 81 drives the pull plate 82 to move horizontally towards the torque sensor 61 side, and the pull plate 82 drives the pin baffle 91 to move horizontally towards the torque sensor 61 side to prevent interference and collision with it during the movement of the caliper support 5. After the caliper support 5 moves to the designated position, the pneumatic push rod 81 pushes the pull plate 82 to drive the pin baffle 91 to move horizontally towards the brake disc 3 side. The guide pin 9 will extend into the support positioning hole 52 of the caliper support 5 due to the action of the return spring, so as to accurately position the caliper support 5. The guide pins 9 on both sides of the second support 7 prevent the caliper support 5 from shifting, which is convenient for the rotary clamp 421 to fix the position of the caliper support 5 later.

[0028] Refer to the attached Figure 3 , attached Figure 4 , attached Figure 6As shown, for the drag torque measurement device of the electromechanical brake caliper assembly, the caliper support 5 is provided with a support positioning hole 52, and the guide pin 9 can axially extend into the support positioning hole 52. The rotating clamp 421 is as shown in the appendix Figure 6 As shown, the vertical state is the released state, and the horizontal state is the locked state. When the caliper support 5 is attached to the reference fixed plate 43 by the handling device, the rotating clamp 421 is in the released state. The rotating clamp 421 will pass through the support notch 51. The guide pins 9 on both sides of the second support seat 7 extend into the support positioning hole 52 under the action of the internal return spring to position the caliper support 5. Then the rotating clamp 421 rotates to lock the caliper support 5 on the reference fixed plate 43. Then the guide pin 9 is withdrawn from the support positioning hole 52 under the action of the driving device 8, and the handling device releases the force. The caliper 53 will bear the drag torque during the test, and the drag torque will be transmitted to the caliper support 5. The withdrawal of the guide pin 9 from the support positioning hole 52 is to avoid affecting the measurement of the drag torque.

[0029] Refer to the appendix Figure 1 and the appendix Figure 7 As shown, for the drag torque measurement device of the electromechanical brake caliper assembly, the driving rotating shaft 11 is connected to the brake disc fixing seat 13 through a transition connecting sleeve 12. A keyway structure is provided between the transition connecting sleeve 12 and the brake disc fixing seat 13 to maintain coaxiality. During the test, the test device needs to test brake discs 3 of different sizes. Brake discs 3 of different sizes correspond to brake disc fixing seats 13 of different sizes. The brake disc fixing seat 13 is convenient for disassembly and installation from the transition connecting sleeve 12. The transition connecting sleeve 12 can be used as an intermediate component to fill the difference in the diameters of the driving rotating shaft 11 and the brake disc fixing seat 13 and achieve a reliable connection.

[0030] Refer to the appendix Figure 7 As shown, for the drag torque measurement device of the electromechanical brake caliper assembly, a fixing block 14 is threadedly connected to the end of the driving rotating shaft 11. A sliding groove is provided in the middle of the fixing block 14, and a sliding block 15 is embedded in the sliding groove. The sliding block 15 is slidably matched with the side wall of the first support seat 1, and the sliding block 15 is locked by a knob 16; the fixing block 14 is used to fix the driving rotating shaft 11 in the non-measurement state to prevent the driving rotating shaft 11 from deviating due to gravity or vibration, resulting in an initial position deviation between the brake disc 3 and the caliper 53. In the non-working state, the sliding block 15 is inserted into the notch of the fixing block 14 and locked by the knob 16 to ensure that the driving rotating shaft 11 will not rotate in the non-working state and ensure the safety of the operator in the non-working state. Other personnel can judge whether the device is in the pre-working state by observing the state of the knob 16, which is convenient for personnel to manage and check the equipment.

[0031] Refer to the appendix Figure 1As shown in the figure, for the drag torque measuring device of the electromechanical brake caliper assembly, a motor 21 is fixedly installed on the first support frame 2. The motor 21 has a motor output shaft 211, and the motor output shaft 211 and the driving rotating shaft 11 are jointly connected to a coupling 22. The coupling 22 smoothly transmits the power from the motor output shaft 211 to the driving rotating shaft 11, ensuring the normal operation of the entire device. Due to factors such as manufacturing and installation errors, or thermal expansion and vibration during operation, axial, radial, or angular offsets may occur between the two shafts. The coupling 22 can compensate for these offsets, ensuring the normal connection and power transmission of the two shafts.

[0032] Refer to the appendix Figure 2 As shown in the figure, for the drag torque measuring device of the electromechanical brake caliper assembly, the caliper 53 is provided with a power supply port 54. The power supply port 54 is used to receive an external control signal to drive the clamping or loosening action of the caliper 53. The principle of clamping and loosening of the caliper 53 can refer to the disclosed technology CN119412450A; when the caliper 53 releases the brake disc 3, the brake disc 3 can rotate freely under the drive of the driving rotating shaft 11, and the drag torque of the caliper 53 will be transmitted to the torque sensor 61 for measurement.

[0033] Refer to the appendix Figure 1 As shown in the figure, for the drag torque measuring device of the electromechanical brake caliper assembly, the first support base 1 and the first support frame 2 are connected to the moving plate 23 at the threaded bottom. The moving plate 23 is provided with a positioning hole 231, and the moving plate 23 is connected to the bottom plate 24 through the positioning hole. There are connection holes corresponding to the positioning holes 231 on the bottom plate 24. The connection holes of the bottom plate 24 are designed through calculation. By sequentially connecting the positioning hole 231 and the connection hole of the bottom plate with screws according to the positions of the connection holes, the positions of the first support base 1 and the first support frame 2 can be adjusted, and finally the central axes of the driving rotating shaft 11 and the driven rotating shaft 41 can be aligned to ensure the experimental accuracy of the test device.

[0034] Embodiment 2: Refer to the appendix Figure 1 and the appendix Figure 2 and the appendix Figure 3 and the appendix Figure 4 and the appendix Figure 6 As shown in the figure, for the method of measuring the drag torque of the electromechanical brake caliper assembly based on the device of Embodiment 1, this method refers to the automotive industry standard QC / T592 Performance Requirements and Bench Test Methods for Passenger Car Brake Caliper Assemblies.

[0035] First, start the draw plate 82 of the driving device 8 to drive the guide pin 9 to move out of the reference fixing plate 43. The external handling device moves the caliper support 5 to fit the reference fixing plate 43. Then release the draw plate 82 of the driving device 8, and let the guide pin 9 reset by its internal spring and extend into the caliper support 5 for positioning. Second step, start the air cylinder 42 to control the rotation of the rotating clamp 421 and lock the caliper support 5 to the reference fixing plate 43. Third step, control the caliper assembly to output a clamping force, and after clamping for 5 s, release the pressure to zero. Fourth step, start the motor 21 to drive the driving shaft 11 to drive the brake disc 3 to rotate. Fifth step, after the brake disc 3 starts to rotate, measure and record the data of the torque sensor 61 during the rotation of the first and tenth circles through the torque sensor 61. The principle of clamping and releasing of the caliper 53 can refer to the public technology CN119412450A. The caliper 53 will be affected by the drag torque during the test. The drag torque is transmitted from the caliper 53 to the caliper support 5 and the driven shaft 41, and finally read by the torque sensor 61. From the initial static state to the start of rotation, the static friction force between the brake disc 3 and the friction plate of the caliper 53 is relatively large. After the brake disc 3 rotates stably, the system enters a stable dynamic friction state, and the measured torque is closer to the dynamic friction torque during the actual operation of the vehicle.

[0036] The data of the torque sensor 61 recorded in the first circle of the test is actually the static torque of the brake disc 3 when the vehicle starts. The EMB caliper 53 relies on an external motor to drive the friction plate to clamp or release the brake disc 3. The drag torque in the first circle directly reflects the execution efficiency of the external motor's reverse return. If the control signal of the external motor is delayed or there is a dead zone in the mechanical transmission, it may cause the friction plate not to completely disengage from the brake disc 3, and the torque in the first circle will be significantly exceeded. The piston return of the EMB caliper 53 relies on mechanical transmission (such as a ball screw or a rack and pinion mechanism), rather than the elastic rebound of the seal ring of the hydraulic system. The data in the first circle can detect whether the reverse movement of the screw is in place and whether the initial separation gap between the friction plate and the brake disc meets the standard. The data of the torque sensor 61 recorded in the tenth circle of the test is to detect the stable performance of the caliper 53 system after multiple rotations. The friction plate of the caliper 53 may gradually lose contact due to the vibration or centrifugal force generated by the rotation of the brake disc 3. The data in the tenth circle can verify whether this self-adjusting ability is effective. The continuous rotation of the brake disc 3 may slightly increase the temperature, resulting in thermal expansion or plastic deformation of metal components. If the drag torque in the tenth circle exceeds the standard, it can reflect such problems. The EMB caliper 53 usually has an automatic compensation function for friction plate wear. Continuously rotating 10 circles can verify whether the compensation mechanism is over-adjusted under dynamic conditions (such as the compensation screw being accidentally locked), resulting in too small a gap between the friction plate and the brake disc. Specifically, it can be found by observing the test data. Generally, the drag torque is normal when it is below 2 N·m.

[0037] The above-described embodiments and / or implementation manners are merely used to illustrate the preferred embodiments and / or implementation manners for realizing the technology of the present invention, and do not impose any formal restrictions on the implementation manners of the technology of the present invention. Any person skilled in the art, without departing from the scope of the technical means disclosed in the content of the present invention, may make some modifications to other equivalent embodiments, but should still be regarded as the same technology or embodiment as the present invention in essence.

[0038] Specific examples are used in this article to elaborate on the principles and implementation manners of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application. The above is only the preferred implementation manner of the present application. It should be noted that due to the limited nature of written expression and the objectively infinite specific structures, for those of ordinary skill in the art, without departing from the principles of the present application, several improvements, refinements or changes can also be made, or the above technical features can be combined in an appropriate manner; these improvements, refinements, changes or combinations, or directly applying the concept and technical solution of the invention to other occasions without improvement, should all be regarded as the protection scope of the present application.

Claims

1. Electronic-mechanical brake caliper assembly drag torque measuring device, comprising a first support base (1) and a first support frame (2), a driving rotating shaft (11) is placed inside the first support base (1), the driving rotating shaft (11) is connected to a brake disc (3), a caliper (53) is arranged around the brake disc (3), the caliper (53) is installed on a caliper support (5), the caliper support (5) is used for being fixed on a driven rotating shaft assembly (4), the driven rotating shaft assembly (4) is connected to a torque sensor (61), and it is characterized in that: The center of the caliper support (5) has a support notch (51), and the support notch (51) is used to extend into the rotary clamp (421). The rotary clamp (421) is used to fix the caliper support (5) on the reference fixed plate (43). The reference fixed plate (43) is provided with holes for passing through the guide pins (9), and the guide pins (9) are driven by a driving device (8).

2. The electronic-mechanical brake caliper assembly drag torque measuring device according to claim 1, characterized in that: The driven rotating shaft assembly (4) includes a driven rotating shaft (41). The driven rotating shaft (41) is placed in the second support seat (7), and one end of the driven rotating shaft (41) is coaxially connected to the torque sensor (61).

3. The electronic-mechanical brake caliper assembly drag torque measuring device according to claim 2, characterized in that: The driving device (8) is installed on the side of the second support seat (7). The driving device (8) includes a pneumatic push rod (81) and a pull plate (82). The telescopic direction of the pneumatic push rod (81) is parallel to the axial direction of the guide pin (9). The edge of the pull plate (82) is provided with a notch that cooperates with the guide pin (9), and a return spring is provided inside the guide pin (9).

4. The electronic-mechanical brake caliper assembly drag torque measuring device according to claim 1, wherein: The caliper support (5) is provided with a support positioning hole (52). The guide pin (9) can extend axially into the support positioning hole (52), and the end of the guide pin (9) is connected to a pin baffle (91).

5. The electronic-mechanical brake caliper assembly drag torque measuring device according to claim 1, wherein: The driving rotating shaft (11) is connected to the brake disc fixing seat (13) through a transition connecting sleeve (12). A keyway structure is provided between the transition connecting sleeve (12) and the brake disc fixing seat (13) to maintain coaxiality.

6. The electronic-mechanical brake caliper assembly drag torque measuring device according to claim 1, characterized in that: The end of the driving rotating shaft (11) is threadedly connected with a fixing block (14). The middle of the fixing block (14) is provided with a sliding groove, and a sliding block (15) is embedded in the sliding groove. The sliding block (15) is slidably matched with the side wall of the first support seat (1), and the sliding block (15) is locked by a knob (16).

7. The electronic-mechanical brake caliper assembly drag torque measuring device according to claim 1, wherein: The first support frame (2) is fixedly provided with a motor (21). The motor (21) has a motor output shaft (211), and the motor output shaft (211) and the driving rotating shaft (11) are jointly connected to a coupling (22).

8. The electronic-mechanical brake caliper assembly drag torque measuring device according to claim 1, wherein: The caliper (53) is provided with a power-on port (54). The power-on port (54) is used to receive an external control signal to drive the clamping or loosening action of the caliper (53). When the caliper (53) loosens the brake disc (3), the brake disc (3) can rotate freely under the drive of the driving rotating shaft (11), and the drag torque of the caliper (53) is measured by the torque sensor (61).

9. The electronic-mechanical brake caliper assembly drag torque measuring device according to claim 1, characterized in that: The first support seat (1) and the first support frame (2) are threadedly connected to a moving plate (23). The moving plate (23) is provided with a positioning hole (231), and the moving plate (23) is connected to the bottom plate (24) through the positioning hole.

10. A method for measuring the drag torque of an electro-mechanical brake caliper assembly based on the device according to claim 7, characterized in that: S1: Start the driving device (8) to move the guide pin (9) out of the reference fixed plate (43). The caliper support (5) fits against the reference fixed plate (43). Release the driving device (8) to let the guide pin (9) reset and extend into the caliper support (5) for positioning; S2: Control the rotary clamp (421) to rotate and lock the caliper support (5) to fix it to the reference fixed plate (43); S3: Control the caliper (53) assembly to output a clamping force, and release the pressure to zero after clamping for 5 s; S4: Start the motor (21) to drive the driving rotating shaft (11) to drive the brake disc (3) to rotate; S5: After the brake disc (3) starts to rotate, measure and record the drag torque during the rotation of the first and tenth circles through the torque sensor (61).

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