Brake pad testing machine

Abstract

The present invention discloses a brake pad testing machine, comprising a frame, on which is provided an inertia adjustment device, a force measuring device, a transmission device, and a braking device connected in sequence. The inertia adjustment device includes a protective cover fixedly connected to the frame, a main shaft disposed within the protective cover, one end of the main shaft extending through the protective cover and connected to a drive motor, an emergency brake disc, a first switchable inertia wheel, a main inertia wheel, and a second switchable inertia wheel disposed in sequence on the main shaft, the first switchable inertia wheel and the second switchable inertia wheel both being connected to a connecting disc, the other end of the connecting disc being connected to a mobile half-clutch via a spline, a fixed half-clutch fixed to the main shaft externally provided on the protective cover, the fixed half-clutch and the mobile half-clutch forming a tooth clutch. The present invention adopts a brake pad testing machine with the above structure, combining mechanical inertia and electrical inertia to improve the control accuracy of the testing machine, and the brake pad clamping mechanism is easily adjustable to accommodate brake discs of different sizes, resulting in high testing efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of testing machines, in particular to a brake pad testing machine. Background Art

[0002] Brake pads are critical safety components in the braking systems of transportation equipment such as automobiles and high-speed trains. To ensure traffic safety, brake pads undergo performance testing after manufacturing, including drag tests, dynamic tests, static tests, and wet brake simulation tests. Common testing methods include small sample tests and 1:1 bench tests. Small sample tests involve simulating the brake pad's reduced size and shape, and therefore lack high accuracy. However, these tests are relatively inexpensive and are often used for preliminary screening of friction materials, quality control, and new product development. Bench testing machines can accurately reflect the operating characteristics of brake pads and have gradually become the mainstream equipment for brake pad quality testing.

[0003] Existing brake pad testing machines lack high control and precision, resulting in inaccurate collection and processing of key data, significantly impacting the authenticity of brake pad performance evaluations. Furthermore, the tester's brake caliper is difficult to adjust to accommodate brake pads and discs of varying sizes, negatively impacting the tester's efficiency. Therefore, a new brake pad testing machine is needed to address these issues. Summary of the Invention

[0004] The purpose of the present invention is to provide a brake pad testing machine, which combines mechanical inertia and electrical inertia to improve the adjustment range and control accuracy of the testing machine, and the clamping mechanism of the brake pad is easy to adjust to adapt to brake discs of different sizes, thereby improving the testing efficiency.

[0005] To achieve the above-mentioned objectives, the present invention provides a brake pad testing machine, comprising a frame, on which an inertia adjustment device, a force measuring device, a transmission device and a braking device connected in sequence are provided, the inertia adjustment device comprising a protective cover, the protective cover being fixedly connected to the frame, a main shaft being provided in the protective cover, one end of the main shaft passing through the protective cover and connected to a drive motor, the other end of the main shaft passing through the protective cover and connected to the force measuring device, an emergency brake disc, a first switchable inertia wheel, a main inertia wheel and a second switchable inertia wheel are provided in sequence on the main shaft, the emergency brake disc is located between the protective cover and the drive motor, and an emergency brake caliper is provided on one side of the emergency brake disc, the first switchable inertia wheel, the main inertia wheel and the second switchable inertia wheel The wheel and the second switchable inertia wheel are located in the protective cover, the main inertia wheel is fixedly connected to the main shaft, the first switchable inertia wheel and the second switchable inertia wheel are both connected to the shaft sleeve located on the outside of the main shaft, the first switchable inertia wheel and the second switchable inertia wheel are both connected to the connecting disk at one end close to the protective cover, a spring is provided on the convex edge of one end of the connecting disk, the other end of the connecting disk is connected to the mobile half-clutch through a spline, one end of the mobile half-clutch is connected to the spring, the mobile half-clutch is provided with a fixed edge located outside the protective cover, a fixed half-clutch fixed to the main shaft is provided outside the protective cover, and the fixed half-clutch and the mobile half-clutch form a dog clutch;

[0006] The force measuring device includes a torque sensor, one end of which is provided with a flange connected to the fixed half clutch, the flange being connected to the static test system, and the other end of the torque sensor being connected to the transmission device;

[0007] The transmission device includes a transmission shaft, one end of the transmission shaft is connected to the torque sensor, the other end of the transmission shaft is connected to the braking device, a bearing seat is provided on the transmission shaft, and the braking device includes a brake shaft, the brake shaft is connected to the transmission shaft, a brake disc is provided on the brake shaft, the brake disc is connected to the temperature measuring component, a ventilation hood corresponding to the brake disc is provided on one side of the brake shaft, and a brake caliper corresponding to the brake disc is provided on the other side of the brake shaft.

[0008] Preferably, the brake caliper includes a lifting plate, and X-axis adjustment holes are provided at the four corners of the lifting plate, a screw rod is provided in the X-axis adjustment hole, and a fixing piece is provided on the screw rod at the upper and lower sides of the lifting plate, and the bottom of the screw rod is connected to the friction sensor, and a Y-axis adjustment hole is provided in the middle of the lifting plate, and an adjustment seat is provided in the Y-axis adjustment hole, and an oil cylinder is provided on the adjustment seat, and the cylinder body of the oil cylinder is movably connected to the first movable arm, and the end of the telescopic rod of the oil cylinder is movably connected to the second movable arm, and a connecting block is provided between the middle of the first movable arm and the second movable arm, one end of the connecting block is rotatably connected to the first movable arm, and the other end of the connecting block is rotatably connected to the second movable arm, and the ends of the first movable arm and the second movable arm are both provided with brake pad mounting positions, and a pressure sensor is provided on the outer surface of the brake pad mounting position, and the two brake pad mounting positions on the emergency brake caliper are respectively located on both sides of the emergency brake disc, and the two brake pad mounting positions on the brake caliper are respectively located on both sides of the brake disc.

[0009] Preferably, the torque sensor is connected to the data acquisition instrument via a converter.

[0010] Preferably, the static test system includes a reduction motor, which is fixed on the frame, and the output end of the reduction motor is connected to the driving gear, which is meshed with the driven gear, and the driven gear is a sector gear with a central angle of 90°, and the driven gear is fixedly connected to the flange.

[0011] Preferably, an air outlet is provided at one end of the ventilation hood close to the brake disc, and the ventilation hood is connected to the fan through a pipeline.

[0012] Preferably, the temperature measuring component includes a slip ring connected to the brake shaft, a rotor portion of the slip ring is connected to a temperature sensor located on the brake disc, and a stator portion of the slip ring is connected to a temperature display.

[0013] Preferably, a shock-absorbing pad is provided at the bottom of the frame.

[0014] Therefore, the present invention adopts the brake pad testing machine of the above structure, and combines mechanical inertia and electrical inertia to improve the control accuracy of the testing machine. The clamping mechanism of the brake pad is easy to adjust to adapt to brake discs of different sizes, and the testing efficiency is high.

[0015] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a top view of an embodiment of a brake pad testing machine of the present invention;

[0017] Figure 2is a cross-sectional view of an embodiment of a brake pad testing machine of the present invention;

[0018] Figure 3 is a schematic diagram of an embodiment of a static test system in a brake pad testing machine of the present invention;

[0019] Figure 4 is a top view of an embodiment of a brake caliper in a brake pad testing machine of the present invention;

[0020] Figure 5 It is a top view of an embodiment of a dog clutch in a brake pad testing machine of the present invention.

[0021] Reference numerals

[0022] 1. Frame; 2. Shock absorber; 3. Protective cover; 4. Spindle; 5. Drive motor; 6. Emergency brake disc; 7. First switchable inertia wheel; 8. Main inertia wheel; 9. Second switchable inertia wheel; 10. Emergency brake caliper; 11. Bushing; 12. Connecting plate; 13. Spring; 14. Fixed edge; 15. Mobile half clutch; 16. Fixed half clutch; 17. Torque sensor; 18. Flange; 19. Reducer motor; 20. Driving gear; 2 1. Driven gear; 22. Drive shaft; 23. Brake shaft; 24. Brake disc; 25. Temperature measuring assembly; 26. Ventilation hood; 27. Brake caliper; 271. Lifting plate; 272. X-axis adjustment hole; 273. Screw; 274. Friction sensor; 275. Y-axis adjustment hole; 276. Cylinder; 277. First movable arm; 278. Second movable arm; 279. Connecting block; 2710. Brake pad mounting position; 2711. Pressure sensor. DETAILED DESCRIPTION

[0023] The embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0024] As shown in the figure, a brake pad testing machine includes a frame 1, which is equipped with an inertia adjustment device, a force measuring device, a transmission device, and a braking device connected in sequence. A shock-absorbing pad 2 is provided at the bottom of the frame 1 to enhance the seismic resistance of the entire testing machine. The inertia adjustment device includes a protective cover 3, which is fixedly connected to the frame 1. A main shaft 4 is located within the protective cover 3. One end of the main shaft 4 extends through the protective cover 3 and is connected to the drive motor 5, and the other end of the main shaft 4 extends through the protective cover 3 and is connected to the force measuring device. The main shaft 4 is equipped with an emergency brake disc 6, a first switchable inertia wheel 7, a main inertia wheel 8, and a second switchable inertia wheel 9 in sequence. The emergency brake disc 6 is located between the protective cover 3 and the drive motor 5, and an emergency brake caliper 10 is provided on one side of the emergency brake disc 6. The combination of the emergency brake caliper 10 and the emergency brake disc 6 enables the testing machine to be brought to an emergency stop, improving both safety and testing efficiency. The first switchable inertia wheel 7, the main inertia wheel 8, and the second switchable inertia wheel are located within the protective cover 3. The main inertia wheel 8 is fixedly connected to the main shaft. The first switchable inertia wheel 7 and the second switchable inertia wheel 9 are both connected to a sleeve 11 on the outside of the main shaft 4. The first and second switchable inertia wheels 7 and 9 are connected to a connecting disc 12 at their ends near the protective cover. A spring 13 is provided on a convex edge at one end of the connecting disc 12. The other end of the connecting disc 12 is connected to a movable half-clutch 15 via a spline. One end of the movable half-clutch 15 is connected to the spring 13. The movable half-clutch 15 is provided with a fixed edge 14 located outside the protective cover. A fixed half-clutch 16 is fixed to the main shaft outside the protective cover. The fixed half-clutch 16 and the movable half-clutch 15 form a dog clutch. When the fixed edge 14 is bolted to the connecting plate 12, the mobile half-clutch 15 is disengaged from the fixed half-clutch 16, and the first switchable inertia wheel 7 and the second switchable inertia wheel 9 do not rotate with the main shaft. When the bolts are loosened to separate the fixed edge 14 from the connecting plate 12, the mobile half-clutch 15 moves along the spline under the push of the spring 13 and finally engages with the fixed half-clutch 16, allowing the first switchable inertia wheel 7 and the second switchable inertia wheel 9 to rotate with the main shaft. The drive motor 5 provides electrical inertia, and the first switchable inertia wheel 7, the main inertia wheel 8, and the second switchable inertia wheel 9 provide mechanical inertia. The coordinated use of the drive motor 5, the first switchable inertia wheel 7, the main inertia wheel 8, and the second switchable inertia wheel 9 can increase the control accuracy of the test machine, thereby ensuring the accuracy of the test structure.

[0025] The force measuring device includes a torque sensor 17, which is connected to the data acquisition instrument via a converter. The torque sensor 17 can process the torque signal on the torque sensor 17 through the converter and display it on the data acquisition instrument in the form of friction torque. One end of the torque sensor 17 is provided with a flange 18 connected to the fixed half clutch 16. The flange 18 is connected to the static test system. The other end of the torque sensor 17 is connected to the transmission device. The static test system includes a reduction motor 19, which is fixed to the frame. The output end of the reduction motor 19 is connected to the driving gear 20, which is meshed with the driven gear 21. The driven gear 21 is a sector gear with a central angle of 90 degrees. The driven gear 21 is fixedly connected to the flange 18. The static test system can detect the maximum static friction coefficient of the brake pad.

[0026] The transmission device includes a transmission shaft 22, one end of which is connected to the torque sensor 17 and the other end of which is connected to the brake device. A bearing seat is provided on the transmission shaft 22, effectively preventing the brake shaft 23 from becoming too long and easily damaged. The brake device includes a brake shaft 23, which is connected to the transmission shaft 22. A brake disc 24 is provided on the brake shaft 23, which is connected to a temperature measurement assembly 25. The temperature measurement assembly 25 includes a slip ring connected to the brake shaft 23. The slip ring's rotor is connected to a temperature sensor located on the brake disc 24, and the slip ring's stator is connected to a temperature display. This effectively measures the temperature of the brake disc 24 during the experiment. A ventilation hood 26 is provided on one side of the brake shaft 23, corresponding to the brake disc 24. The hood 26 has an air outlet at one end near the brake disc 24 and is connected to a fan via a duct. This hood provides simulated wind speed for the experiment and also removes dust. A brake caliper 27 is provided on the other side of the brake shaft 23 and is corresponding to the brake disc 24 . The brake caliper 27 is used to apply the brake pads to the brake shaft 23 .

[0027] The brake caliper 27 includes a lifting plate 271. Each of the four corners of the lifting plate 271 has an X-axis adjustment hole 272. Screws 273 are located within these holes. Adjusting the position of the screws 273 within the holes 272 adjusts the position of the brake pad mounting point 2710 in the X-axis direction. Screws 273 are attached to fixings located above and below the lifting plate 271. By securing the lifting plate 271 to different heights of the screws 273, the height of the brake pad mounting point 2710 can be adjusted. The bottom of the screws 273 is connected to a friction sensor 274, which detects the friction force of the brake pad on the brake disc 24. A Y-axis adjustment hole 275 is located in the center of the lifting plate 271. An adjustment seat is located within the hole 275. The adjustment seat can be moved within the hole 275 to adjust the position of the brake pad mounting point 2710 in the Y-axis direction. The adjustment seat is provided with a hydraulic cylinder 276. The cylinder body of the hydraulic cylinder 276 is movably connected to the first movable arm 277. The end of the telescopic rod of the hydraulic cylinder 276 is movably connected to the second movable arm 278. A connecting block 279 is provided between the middle portions of the first movable arm 277 and the second movable arm 278. One end of the connecting block 279 is rotatably connected to the first movable arm 277, and the other end of the connecting block is rotatably connected to the second movable arm 278. The ends of the first movable arm 277 and the second movable arm 278 are each provided with a brake pad mounting position 2710. The first movable arm 277 and the second movable arm 278 form a scissor structure with the connecting block 279 as the fulcrum. When the telescopic rod of the hydraulic cylinder 276 is extended, the two brake pad mounting positions 2710 move closer together. When the telescopic rod of the hydraulic cylinder 276 is retracted, the two brake pad mounting positions 2710 move away from each other. A pressure sensor 2711 is provided on the outer surface of the brake pad mounting position 2710. The pressure sensor 2711 can detect the pressure applied by the brake pad to the brake disc 24 when driven by the hydraulic cylinder 276. The two brake pad mounting positions 2710 on the emergency brake caliper 10 are located on either side of the emergency brake disc 6, and the two brake pad mounting positions 2710 on the brake caliper 27 are located on either side of the brake disc 24. This allows the brake pads to clamp or release the brake disc 24 and the emergency brake disc 6 under the drive of the oil cylinder 276. The brake caliper 27 can be adjusted in the X-axis, Y-axis, and Z-axis directions, making the brake pad clamping mechanism easy to adjust to accommodate brake discs 24 of different sizes.

[0028] Therefore, the present invention adopts the brake pad testing machine of the above structure, and combines mechanical inertia and electrical inertia to improve the control accuracy of the testing machine. The clamping mechanism of the brake pad is easy to adjust to adapt to brake discs of different sizes, and the testing efficiency is high.

[0029] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the same. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solutions of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A brake pad testing machine, characterized in that: The invention comprises a frame, on which an inertia adjustment device, a force measuring device, a transmission device and a braking device connected in sequence are provided. The inertia adjustment device comprises a protective cover, which is fixedly connected to the frame. A main shaft is provided in the protective cover, one end of the main shaft passes through the protective cover and is connected to the drive motor, and the other end of the main shaft passes through the protective cover and is connected to the force measuring device. An emergency brake disc, a first switchable inertia wheel, a main inertia wheel and a second switchable inertia wheel are provided on the main shaft in sequence. The emergency brake disc is located between the protective cover and the drive motor, and an emergency brake caliper is provided on one side of the emergency brake disc. The first switchable inertia wheel, the main inertia wheel and the second switchable inertia wheel are connected to the main shaft. The wheel is located in the protective cover, the main inertia wheel is fixedly connected to the main shaft, the first switchable inertia wheel and the second switchable inertia wheel are both connected to the shaft sleeve located on the outside of the main shaft, the first switchable inertia wheel and the second switchable inertia wheel are both connected to the connecting disk at one end close to the protective cover, a spring is provided on the convex edge of one end of the connecting disk, the other end of the connecting disk is connected to the mobile half-clutch through a spline, one end of the mobile half-clutch is connected to the spring, the mobile half-clutch is provided with a fixed edge located outside the protective cover, a fixed half-clutch fixed to the main shaft is provided outside the protective cover, and the fixed half-clutch and the mobile half-clutch form a dog clutch; The force measuring device includes a torque sensor, one end of which is provided with a flange connected to the fixed half clutch, the flange being connected to the static test system, and the other end of the torque sensor being connected to the transmission device; The transmission device includes a transmission shaft, one end of the transmission shaft is connected to the torque sensor, the other end of the transmission shaft is connected to the braking device, a bearing seat is provided on the transmission shaft, and the braking device includes a brake shaft, the brake shaft is connected to the transmission shaft, a brake disc is provided on the brake shaft, the brake disc is connected to the temperature measuring component, a ventilation hood corresponding to the brake disc is provided on one side of the brake shaft, and a brake caliper corresponding to the brake disc is provided on the other side of the brake shaft.

2. The brake pad testing machine according to claim 1, characterized in that: The brake caliper includes a lifting plate, and X-axis adjustment holes are provided at the four corners of the lifting plate. A screw is provided in the X-axis adjustment hole, and a fixing piece is provided on the screw rod at the upper and lower sides of the lifting plate. The bottom of the screw rod is connected to the friction sensor, and a Y-axis adjustment hole is provided in the middle of the lifting plate, and an adjustment seat is provided in the Y-axis adjustment hole. A cylinder is provided on the adjustment seat, and the cylinder body of the cylinder is movably connected to the first movable arm, and the end of the telescopic rod of the cylinder is movably connected to the second movable arm. A connecting block is provided between the middle of the first movable arm and the second movable arm, one end of the connecting block is rotatably connected to the first movable arm, and the other end of the connecting block is rotatably connected to the second movable arm. Brake pad mounting positions are provided at the ends of the first movable arm and the second movable arm, and a pressure sensor is provided on the outer surface of the brake pad mounting position. The two brake pad mounting positions on the emergency brake caliper are respectively located on both sides of the emergency brake disc, and the two brake pad mounting positions on the brake caliper are respectively located on both sides of the brake disc.

3. The brake pad testing machine according to claim 2, characterized in that: The torque sensor is connected to the data acquisition instrument through a converter.

4. The brake pad testing machine according to claim 3, characterized in that: The static testing system includes a reduction motor, which is fixed on the frame. The output end of the reduction motor is connected to the driving gear, and the driving gear is meshed with the driven gear. The driven gear is a sector gear with a central angle of 90°, and the driven gear is fixedly connected to the flange.

5. The brake pad testing machine according to claim 4, characterized in that: An air outlet is provided at one end of the ventilation hood close to the brake disc, and the ventilation hood is connected to the fan through a pipeline.

6. The brake pad testing machine according to claim 5, characterized in that: The temperature measurement component includes a slip ring connected to the brake shaft, a rotor portion of the slip ring is connected to a temperature sensor located on the brake disc, and a stator portion of the slip ring is connected to a temperature display.

7. The brake pad testing machine according to claim 6, characterized in that: A shock-absorbing pad is provided at the bottom of the frame.

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