Friction and wear performance detection device for automobile brake disc

Abstract

The invention relates to an automobile brake disc friction and wear performance detection device, and relates to the technical field of brake disc testing, the automobile brake disc friction and wear performance detection device comprises a workbench, a fixing assembly, a driving assembly and a clamping assembly, the fixing assembly comprises a first fixing ring and a second fixing ring, and a brake disc to be detected is fixedly connected between the first fixing ring and the second fixing ring; the first fixing ring is rotationally connected with the workbench along the axis of the first fixing ring, the second fixing ring is slidably connected with the support along the axis of the second fixing ring, and the sliding base and the second fixing ring move synchronously. The driving assembly drives the first fixing ring to rotate; the clamping assembly is used for clamping the to-be-tested brake disc in rotation so as to stop rotation of the to-be-tested brake disc; the distance between the first fixing ring and the end, abutting against the to-be-tested brake disc, of the first brake pad is equal to the distance between the second fixing ring and the end, abutting against the to-be-tested brake disc, of the second brake pad and the end, abutting against the to-be-tested brake disc, of the second brake pad. The method has the effect of improving the detection precision.

Description

Technical Field

[0001] This application relates to the field of brake disc testing technology, and in particular to a device for testing the friction and wear performance of automotive brake discs. Background Technology

[0002] In the automotive manufacturing and testing field, performance testing of braking systems is crucial. As a key component of the braking system, the friction and wear performance of the brake disc directly affects the braking effect and driving safety of a vehicle. With the continuous development of the automotive industry, the requirements for brake disc performance testing are becoming increasingly stringent. Accurate testing ensures the reliability of brake discs in actual use, reduces safety accidents caused by brake failure, and protects people's lives and property. At the same time, efficient and accurate testing equipment also helps automakers improve production quality and efficiency, and reduce production costs. Figure 1 The brake disc includes a wheel flange and two brake discs, and the wheel flange has several hub bolt holes.

[0003] Related technology can be found in Chinese Patent No. CN213985652U, which discloses a multi-condition brake disc wear testing device. The device includes a platform, a base plate fixedly connected to the top of the platform, a strip-shaped hole on the base plate containing an operator, and a first mounting plate and a second mounting plate fixedly connected to the two sides of the base plate, respectively. A motor is fixedly connected to one side of the first mounting plate. This multi-condition brake disc wear testing device allows the brake disc to rotate by starting the motor, and the two brake pads to clamp the brake disc by turning a knob, thus simulating wear testing. The rotational speed of the brake disc can be adjusted by moving the end cover, the clamping force of the brake pads can be adjusted by turning the knob, and the clamping position of the brake pads can be adjusted by adjusting the length of the telescopic rod. This allows for testing under multiple conditions, simulating various wear scenarios, and offers strong applicability, resulting in more accurate and comprehensive test results.

[0004] Regarding the aforementioned technologies, due to the varying thicknesses of brake discs of different specifications, traditional fixing methods often fail to ensure that the brake disc is precisely centered between the two brake pads after fixing. This can lead to uneven contact between the brake discs and brake pads during synchronous movement in the testing process, affecting the accuracy of the test results and failing to truly reflect the friction and wear performance of the brake discs. Summary of the Invention

[0005] To improve testing accuracy, this application provides a device for testing the friction and wear performance of automotive brake discs.

[0006] This application provides a device for testing the friction and wear performance of automotive brake discs, employing the following technical solution: A device for testing the friction and wear performance of automotive brake discs includes a worktable with a support fixedly mounted on its upper surface and a slide block slidably connected to the support; a fixing assembly including a first fixing ring and a second fixing ring, with the brake disc to be tested fixedly connected between the first and second fixing rings, the first fixing ring being rotatably connected to the worktable along its own axis, the second fixing ring being slidably connected to the support along its own axis, and the slide block moving synchronously with the second fixing ring; and a driving assembly including a rotary motor, a driving wheel, and a driven wheel, the rotary motor being fixedly connected to the worktable, the output end of the rotary motor being coaxially fixedly connected to the driving wheel, the driving wheel being meshed with the driven wheel, and the driven wheel... The clamping assembly, including a first brake pad, a second brake pad, a first lead screw, a second lead screw, and a clamping drive, is coaxially and synchronously rotated with the first fixed ring. The first brake pad is threadedly connected to the first lead screw, and the second brake pad is threadedly connected to the second lead screw. The first lead screw is rotatably connected to the bracket, and the second lead screw is rotatably connected to the slide. The first lead screw and the second lead screw are coaxially and slidably connected. The clamping drive is used to drive the first lead screw and the second lead screw to rotate synchronously. The distance between the ends of the first fixed ring and the first brake pad that abut against the brake disc under test is equal to the distance between the ends of the second fixed ring and the second brake pad that abut against the brake disc under test.

[0007] By adopting the above technical solution, the brake disc under test is fixed between the first and second fixed rings, and the slide block slides synchronously with the second fixed ring on the bracket, which facilitates the adjustment of the position and state of the brake disc. The rotating motor drives the driving wheel to rotate, and the driving wheel meshes with the driven wheel, causing the driven wheel to rotate synchronously with the first fixed ring on the same axis, which can drive the brake disc to rotate. The first lead screw is rotatably connected to the bracket, and the second lead screw is rotatably connected to the slide block, and the two are slidably connected on the same axis. The clamping drive simultaneously drives the first lead screw and the second lead screw to rotate synchronously, so that the first brake pad and the second brake pad can respectively achieve the clamping action of the brake disc through the threaded connection with the first lead screw and the second lead screw. The distance between the first fixed ring and the first brake pad, and the distance between the second fixed ring and the end of the brake disc under test is equal, which can ensure that the brake disc is located in the middle of the two brake pads after it is fixed. This solves the problem that it is difficult to be in the middle of the two brake pads due to the different thicknesses of brake discs of different specifications. This allows the brake disc to be stably tested for friction and wear performance, improves the testing accuracy, and is suitable for testing brake discs of different specifications.

[0008] Optionally, the axial length of the first fixing ring is greater than the axial length of the wheel flange of the brake disc to be tested. The first fixing ring is fixed with several positioning rods, which correspond one-to-one with the wheel hub bolt holes of the brake disc to be tested. The second fixing ring is provided with several positioning holes that correspond one-to-one with the positioning rods. Several inserts are slidably connected to the second fixing ring in the positioning holes. The inserts are sleeved on the outside of the positioning rods. The end of the inserts near the first fixing ring is fixedly connected to an abutment plate. An elastic element is fixed between the abutment plate and the second fixing ring.

[0009] By adopting the above technical solution, when brake discs of different thicknesses are fixed between the first and second fixed rings, precise positioning can be achieved by using the positioning rod and the wheel hub bolt holes. At the same time, the elastic element can be adaptively adjusted according to the actual thickness of the brake disc, ensuring that the abutment plate abuts against the inner wall of the wheel flange, thereby improving the accuracy and stability of subsequent brake disc friction and wear performance testing.

[0010] Optionally, a slide cylinder is fixed at the end of the first fixed ring away from the second positioning ring, the driving wheel is slidably connected to the outside of the slide cylinder along its own axis, the outer diameter of the driven wheel gradually decreases or increases along the axis, and the side of the driven wheel close to the driving wheel is parallel to the side wall of the sleeve.

[0011] By adopting the above technical solution, the relative positions of the driving wheel and the driven wheel can be flexibly adjusted according to actual needs during the operation of the device to change the transmission ratio, thereby adapting to the speed detection requirements of different specifications of brake discs and improving the versatility and adaptability of the detection device. At the same time, the structural design can also ensure a stable meshing connection between the driving wheel and the driven wheel, ensuring the reliability of power transmission, enabling the brake disc to rotate smoothly, and thus improving the accuracy of the detection results.

[0012] Optionally, a slide rod is slidably connected to the upper surface of the worktable. The slide rod passes coaxially through the first fixed ring and the second fixed ring in sequence. A positioning ring is sleeved on the outer wall of the slide rod. An end face bearing is fixed at the end of the positioning ring near the first fixed ring. The end face bearing is used to abut against the end of the second fixed ring away from the first fixed ring. The positioning ring is detachably connected to the slide rod. A push ring is fixed on the outside of the slide rod. The push ring is located between the second fixed ring and the first fixed ring.

[0013] By adopting the above technical solution, when the second fixing ring is sleeved on the outside of the slide rod, an end face bearing is installed on the slide rod, followed by a positioning ring. As the slide rod moves, the end face bearing abuts against the second fixing ring, and the positioning ring abuts against the end face bearing. As the slide rod continues to move, the positioning ring pushes the end face bearing to clamp the second fixing ring, thus providing positioning and support for the second fixing ring and ensuring its stability during operation. The positioning ring and slide rod are detachably connected, facilitating the replacement of suitable end face bearings for different brake disc specifications, improving the versatility of the device. The push ring can provide a horizontal thrust when the second fixing ring disengages from the positioning rod, improving the sliding stability between the second fixing ring and the positioning rod.

[0014] Optionally, a drive motor is fixedly mounted on the upper surface of the worktable, a worm gear is fixedly mounted coaxially on the drive motor, a worm wheel is meshed with the worm gear, the worm wheel is rotatably connected to the worktable, a drive gear is fixedly mounted coaxially on the worm wheel, and a toothed groove is opened on the outer wall of the end of the slide rod away from the positioning ring to mesh with the drive gear.

[0015] By adopting the above technical solution, the drive motor drives the worm gear to rotate, the worm gear drives the worm wheel meshing with it to rotate, and the worm wheel drives the coaxial drive gear to rotate. The drive gear meshes with the tooth grooves on the outer wall of the slide bar, thereby driving the slide bar to slide on the upper surface of the worktable. This transmission method can achieve smooth movement of the slide bar, and by utilizing the characteristics of worm gear transmission and self-locking, a large transmission ratio can be achieved, making the movement control of the slide bar more precise. This helps to accurately fix the brake disc in the appropriate position, reduces the movement of the slide bar under other external forces, and ensures that brake discs of different specifications are fixed in the middle of the two brake pads, thereby improving the accuracy and reliability of the friction and wear performance testing of automotive brake discs.

[0016] Optionally, a movable frame is slidably connected to the upper surface of the workbench along the axis of the first fixed ring. The movable frame is fixedly connected to the slide block. Two clamping components with opposite sliding directions are vertically slidably connected inside the movable frame. The two clamping components are used to clamp the upper and lower ends of the brake disc to be tested, respectively. The two clamping components are symmetrically arranged along the horizontal plane where the axis of the first fixed ring is located.

[0017] By adopting the above technical solution, the moving frame and the slide can move synchronously, enabling flexible adjustment of the detection position. The two vertically sliding clamping components inside the moving frame can clamp the upper and lower ends of the brake disc respectively, ensuring that the brake disc is subjected to uniform force when clamped, avoiding deviation or shaking of the brake disc due to uneven force, thereby ensuring that the brake disc is coaxial with the first fixing ring and adapting to brake discs of different diameters.

[0018] Optionally, the clamping assembly includes a sliding plate, a synchronizing plate, and two clamping plates. The two clamping plates are slidably connected to the sliding plate in opposite sliding directions. The synchronizing plate is located between the two clamping plates. A connecting rod is rotatably connected to the end of the synchronizing plate near the clamping plate. The end of the connecting rod away from the synchronizing plate is rotatably connected to the clamping plate. A clamping block is fixed to the end of the clamping plate near the synchronizing plate. The clamping block is used to abut and clamp the brake disc to be tested.

[0019] By adopting the above technical solution, when the synchronizing plate moves, the connecting rod drives the two clamping plates to slide in opposite directions, thereby enabling the clamping block to accurately abut and clamp the brake disc under test. This structural design can adapt to brake discs of different specifications and can automatically adjust the distance between the two clamping plates according to the size of the brake disc, ensuring that the brake disc is firmly fixed during transportation and improving the stability of transportation.

[0020] Optionally, the end of the second fixing ring away from the first fixing ring is fixedly provided with an annular track, and a plurality of discs are provided in the annular track. The end of the disc away from the first fixing ring is fixedly provided with a round rod, and the round rod is fixedly connected to the movable frame along the horizontal axis.

[0021] By adopting the above technical solution, in the automotive brake disc friction and wear performance testing device, the annular track and several discs located at the end of the second fixed ring away from the first fixed ring, along with the circular rods fixedly connected to the moving frame on the discs, enable a stable and flexible connection between the second fixed ring and the moving frame. This connection method ensures that the second fixed ring moves synchronously with the moving frame, and also ensures that the second fixed ring can rotate with the brake disc under test during the testing process, thereby improving the accuracy and reliability of the testing device in detecting the friction and wear performance of the brake disc under test.

[0022] Optionally, an elastic reset member is fixed between the slide plate and the synchronization plate, and a number of guide rods are fixed at one end of the slide plate near the synchronization plate, with the synchronization plate located between the guide rods.

[0023] By adopting the above technical solution, when the synchronization plate moves, the elastic reset component can provide a restoring force, allowing the synchronization plate to return to its initial position, ensuring the stability and repeatability of the clamping assembly. The guide rod can guide the movement of the synchronization plate, allowing it to move smoothly along the direction of the guide rod, preventing the synchronization plate from shifting or wobbling during movement, thereby improving the clamping accuracy and stability of the clamping assembly.

[0024] Optionally, a rectangular rod is fixed at one end of the first lead screw near the second lead screw. The rectangular rod passes through the second lead screw and is rotatably connected to the bracket. The second lead screw is slidably connected to the rectangular rod.

[0025] By adopting the above technical solution, the first and second lead screws can achieve both synchronous rotation and relative sliding in the axial direction. When the slide moves the second lead screw, due to the presence of the rectangular rod, the second lead screw can rotate synchronously with the first lead screw, ensuring the normal functioning of the clamping drive to drive the first and second lead screws to rotate synchronously. This ensures that the first and second brake pads can stably clamp the brake disc. At the same time, the sliding of the second lead screw on the rectangular rod adapts to the different thicknesses of brake discs of different specifications, making the detection device applicable to brake discs of different thicknesses. It ensures that the brake disc is positioned precisely in the middle of the two brake pads after fixing, improving the versatility and detection effect of the device.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. The brake disc under test is fixed between the first and second fixed rings. The slide block slides synchronously with the second fixed ring on the bracket, facilitating the adjustment of the brake disc's position and state. The rotating motor drives the driving wheel to rotate, and the driving wheel meshes with the driven wheel, causing the driven wheel to rotate synchronously with the first fixed ring on the same axis, thus driving the brake disc to rotate. The first lead screw is rotatably connected to the bracket, and the second lead screw is rotatably connected to the slide block, and the two are slidably connected on the same axis. The clamping drive simultaneously drives the first lead screw and the second lead screw to rotate synchronously, allowing the first brake pad and the second brake pad to clamp the brake disc through threaded connections with the first lead screw and the second lead screw, respectively. The distances between the first fixed ring and the first brake pad, and between the second fixed ring and the second brake pad and the end of the brake disc under test are equal, ensuring that the brake disc is located in the exact center of the two brake pads after fixing. This solves the problem that different specifications of brake discs are difficult to align with the two brake pads due to differences in thickness, enabling stable friction and wear performance testing of the brake disc, improving testing accuracy, and adapting to the testing of brake discs of different specifications. 2. When brake discs of different thicknesses are fixed between the first and second fixed rings, the positioning rod and the wheel hub bolt holes are used for precise positioning. At the same time, the elastic element can be adaptively adjusted according to the actual thickness of the brake disc to ensure that the abutment plate abuts against the inner wall of the wheel flange, thereby improving the accuracy and stability of subsequent brake disc friction and wear performance testing. 3. This design allows for flexible adjustment of the relative positions of the driving and driven wheels during operation, based on actual needs, to change the transmission ratio and adapt to the speed detection requirements of different brake disc specifications, thus improving the versatility and adaptability of the detection device. Simultaneously, this structural design ensures a stable meshing connection between the driving and driven wheels, guaranteeing reliable power transmission and enabling the brake disc to rotate smoothly, thereby improving the accuracy of the detection results. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the brake disc structure.

[0028] Figure 2 This is a schematic diagram of the overall structure from the rear view of Embodiment 1.

[0029] Figure 3 This is a frontal view of the structural diagram of Example 1.

[0030] Figure 4 yes Figure 1 An enlarged schematic diagram of part A in the middle.

[0031] Figure 5 This is a schematic diagram of the second fixing ring.

[0032] Figure 6 yes Figure 1 Enlarged diagram of part B.

[0033] Figure 7 This is a schematic diagram of the structure that drives the slider to move.

[0034] Figure 8 This is a schematic diagram of the driving component in Embodiment 2.

[0035] Explanation of reference numerals in the attached drawings: 100, brake disc to be tested; 110, wheel flange; 120, brake disc; 130, wheel hub bolt hole; 1, worktable; 11, bracket; 12, slide; 121, disc; 122, round rod; 2, fixing assembly; 21, first fixing ring; 211, positioning rod; 212, slide cylinder; 22, second fixing ring; 221, positioning hole; 222, annular track; 23, abutment plate; 231, insert; 232, elastic element; 3, drive assembly; 31, rotating motor; 32, driving wheel; 33, driven wheel. 4. Wheel; 5. Clamping assembly; 6. First brake pad; 7. Second brake pad; 8. First lead screw; 9. Rectangular rod; 10. Second lead screw; 11. Clamping drive component; 12. Slide rod; 13. Positioning ring; 14. End face bearing; 15. Push ring; 16. Tooth groove; 17. Drive gear; 18. Worm gear; 19. Worm; 20. Drive motor; 10. Moving frame; 11. Clamping assembly; 12. Slide plate; 13. Synchronizing plate; 14. Clamping plate; 15. Connecting rod; 16. Clamping block; 17. Elastic reset component; 18. Guide rod. Detailed Implementation

[0036] The present application will be further described in detail below with reference to all the accompanying drawings.

[0037] This application discloses a device for testing the friction and wear performance of automotive brake discs. Example 1

[0038] Reference Figure 2 A device for testing the friction and wear performance of automotive brake discs includes a worktable 1, a fixing component 2, a driving component 3, and a clamping component 4. A bracket 11 is fixedly mounted on the upper surface of the worktable 1, the clamping component 4 is mounted on the bracket 11, and a slide block 12 is slidably connected to the bracket 11.

[0039] Reference Figure 3 The fixing component 2 includes a first fixing ring 21 and a second fixing ring 22, and the brake disc to be tested is fixed between the first fixing ring 21 and the second fixing ring 22. A slide cylinder 212 is fixed at one end of the first fixing ring 21 away from the second positioning ring 51. The two ends of the slide cylinder 212 are sleeved with bearings. The bearings are fixedly connected to the worktable 1 through the base. The first fixing ring 21 is fixed by the two bearings and rotates along its own axis to be connected to the worktable 1.

[0040] Reference Figure 3The drive assembly 3 includes a rotary motor 31, a drive wheel 32, and a driven wheel 33. The rotary motor 31 is fixedly connected to one of the bases. The output end of the rotary motor 31 is fixedly connected to the drive wheel 32 on the same axis. The drive wheel 32 is meshed with the driven wheel 33. The driven wheel 33 rotates synchronously on the same axis as the first fixed ring 21.

[0041] Reference Figure 4 and Figure 5 The axial length of the first fixing ring 21 is greater than the axial length of the wheel flange of the brake disc under test. The first fixing ring 21 is fixed with several positioning rods 211, each corresponding to a wheel hub bolt hole on the brake disc under test. The second fixing ring 22 has several positioning holes 221 corresponding to the positioning rods 211, enabling precise positioning of brake discs of different thicknesses between the first and second fixing rings using the cooperation between the positioning rods 211 and the wheel hub bolt holes. Several inserts 231 are slidably connected within the positioning holes 221 of the second fixing ring 22. The inserts 231 are sleeved on the outside of the positioning rods 211. A common fixed connection between the inserts 231 and the first fixing ring 21 is a contact plate 23. An elastic element 232 is fixed between the contact plate 23 and the second fixing ring 22. The elastic element 232 can be adaptively adjusted according to the actual thickness of the brake disc to ensure that the end of the abutment plate 23 away from the positioning rod 211 abuts against the inner wall of the wheel flange, thereby improving the accuracy and stability of subsequent brake disc friction and wear performance testing.

[0042] Reference Figure 3 and Figure 6 The clamping assembly 4 includes a first brake pad 41, a second brake pad 42, a first lead screw 43, a second lead screw 44, and a clamping drive component 45. Mounting seats are fixed to the ends of both the first brake pad 41 and the second brake pad 42 that are far apart from each other. The first brake pad 41 is threadedly connected to the first lead screw 43 via the mounting seat, and the second brake pad 42 is threadedly connected to the second lead screw 44 via the mounting seat. The mounting seat is a folded plate, and a clearance is left between the threaded end of the mounting seat and the first brake pad 41 or the second brake pad 42 to prevent collision with other components when the first brake pad 41 or the second brake pad 42 is reset.

[0043] Reference Figure 6The first lead screw 43 is rotatably connected to the bracket 11, and the second lead screw 44 is rotatably connected to the slide block 12. The clamping drive 45 is used to drive the first lead screw 43 and the second lead screw 44 to rotate synchronously. A rectangular rod 431 is fixed at one end of the first lead screw 43 near the second lead screw 44. The rectangular rod 431 passes through the second lead screw 44 and is rotatably connected to the bracket 11. The second lead screw 44 is slidably connected to the rectangular rod 431, realizing the coaxial sliding connection between the first lead screw 43 and the second lead screw 44. The clamping drive 45 can be a motor or a manual crank. The rectangular rod 431 can also be other polygons or irregular shapes, as long as the first lead screw 43 and the second lead screw 44 do not rotate relative to each other.

[0044] Reference Figure 5 The second fixed ring 22 has an annular track 222 fixed at one end away from the first fixed ring 21. Several discs 121 are arranged within the annular track 222. A round rod 122 is fixed at one end of each disc 121 away from the first fixed ring 21. The round rod 122 has external threads on its outer side and is threadedly connected to the slide block 12 along the horizontal axis. This connection method ensures that the second fixed ring 22 moves synchronously with the moving frame 6, and also ensures that the second fixed ring 22 can rotate with the brake disc under test during the testing process.

[0045] Reference Figure 2 and Figure 3 A movable frame 6 is slidably connected to the upper end face of the worktable 1 along the first fixed ring 21. A guide seat and a screw nut seat are fixedly provided on the lower end face of the movable frame 6, and a guide rod and a screw are respectively threaded through them. The screw nut seat is threadedly connected to the screw. A motor is fixedly provided on the upper end face of the worktable 1 to drive the screw to rotate, thereby driving the movable frame 6 to move.

[0046] Reference Figure 2 and Figure 3 The movable frame 6 is fixedly connected to the slide block 12, enabling the movable frame 6 and the slide block 12 to move synchronously, thus allowing for flexible adjustment of the detection position. Two clamping components 7 with opposite sliding directions are vertically slidably connected inside the movable frame 6. These two clamping components 7 are used to clamp the upper and lower ends of the brake disc to be tested, respectively. The two clamping components 7 are symmetrically arranged along the horizontal plane containing the axis of the first fixing ring 21. This ensures that the brake disc is subjected to uniform force when clamped, preventing the brake disc from shifting or shaking due to uneven force, thereby ensuring that the brake disc is coaxial with the first fixing ring 21 and accommodating brake discs of different diameters.

[0047] Reference Figure 2 and Figure 3 The distance between the first fixing ring 21 and the first brake pad 41 and the end of each abutting the brake disc under test is equal to the distance between the second fixing ring 22 and the end of each brake pad 42 and the brake disc under test. This achieves the effect of adapting to brake discs of different thicknesses, ensuring that the brake disc is located in the middle of the two brake pads, and improving the accuracy of the test.

[0048] Reference Figure 6 The clamping assembly 7 includes a sliding plate 71, a synchronizing plate 72, and two clamping plates 73. The two clamping plates 73 are slidably connected to the sliding plate 71 in opposite sliding directions. The synchronizing plate 72 is located between the two clamping plates 73. A connecting rod 74 is rotatably connected to the end of the synchronizing plate 72 near the clamping plates 73, and the end of the connecting rod 74 away from the synchronizing plate 72 is rotatably connected to the clamping plates 73. A clamping block 75 is fixedly provided at the end of the clamping plate 73 near the synchronizing plate 72. The clamping block 75 is used to abut and clamp the brake disc under test. The clamping block 75 can be a rubber block, providing good friction and cushioning performance. The width of the synchronizing plate 72 is greater than the maximum measurable thickness of the brake disc. When the synchronizing plate 72 moves, the connecting rod 74 drives the two clamping plates 73 to slide in opposite directions, thereby enabling the clamping block 75 to accurately abut and clamp the brake disc under test.

[0049] Reference Figure 6 An elastic reset member 76 is fixed between the slide plate 71 and the synchronization plate 72. Several elastic reset members 76 are fixed at the end of the slide plate 71 near the synchronization plate 72. The synchronization plate 72 is located between several guide rods 77. The end of the guide rod 77 away from the slide plate 71 is located between the clamping block 75 and the slide plate 71. When the synchronization plate 72 moves, the elastic reset member 76 can provide a restoring force to return the synchronization plate 72 to its initial position, ensuring the stability and repeatability of the clamping assembly 7.

[0050] Reference Figure 4 and 7A slide rod 5 is slidably connected to the upper surface of the worktable 1. The slide rod 5 passes coaxially through the first fixed ring 21 and the second fixed ring 22 in sequence. A positioning ring 51 is sleeved on the outer wall of the slide rod 5. An end face bearing 52 is fixed to the end of the positioning ring 51 near the first fixed ring 21. The end face bearing 52 is used to abut against the end of the second fixed ring 22 away from the first fixed ring 21. The positioning ring 51 is detachably connected to the slide rod 5. A push ring 53 is fixed to the outside of the slide rod 5. The push ring 53 is located between the second fixed ring 22 and the first fixed ring 21. When the second fixed ring 22 is sleeved on the outside of the slide rod 5, the end face bearing 52 is installed on the slide rod 5, and then the positioning ring 51 is installed. As the slide rod 5 moves, the end face bearing 52 abuts against the second fixed ring 22, and the positioning ring 51 abuts against the end face bearing 52. As the slide rod 5 continues to move, the positioning ring 51 pushes the end face bearing 52 to clamp the second fixed ring 22, which can play a role in positioning and supporting the second fixed ring 22, ensuring the stability of the second fixed ring 22 during operation. The positioning ring 51 is detachably connected to the slide rod 5, facilitating the replacement of the appropriate end face bearing 52 for different brake disc specifications, thus improving the versatility of the device. The push ring 53 provides a horizontal thrust when the second fixed ring 22 disengages from the positioning rod 211, improving the sliding stability between the second fixed ring 22 and the positioning rod 211. The outer diameter of the push ring 53 is larger than the inner diameter of the second fixed ring 22.

[0051] Reference Figure 7 A drive motor 58 is fixedly mounted on the upper surface of the worktable 1. A worm gear 57 is fixedly mounted coaxially on the drive motor 58. A worm wheel 56 is meshed with the worm gear 57. The worm wheel 56 is rotatably connected to the worktable 1. A drive gear 55 is fixedly mounted coaxially on the worm wheel 56. A toothed groove 54 that meshes with the drive gear 55 is opened on the outer wall of the end of the slide rod 5 away from the positioning ring 51.

[0052] The implementation principle of the automobile brake disc friction and wear performance testing device according to this application embodiment is as follows: The brake disc to be tested is fixed between the first fixed ring 21 and the second fixed ring 22. The slide block 12 slides synchronously with the second fixed ring 22 on the bracket 11, which facilitates the adjustment of the position and state of the brake disc. The rotating motor 31 drives the driving wheel 32 to rotate. The driving wheel 32 meshes with the driven wheel 33, causing the driven wheel 33 to rotate synchronously with the first fixed ring 21 on the same axis, which can drive the brake disc to rotate. The first lead screw 43 is rotatably connected to the bracket 11, and the second lead screw 44 is rotatably connected to the slide block 12 and the two are slidably connected on the same axis. The clamping drive member 45 simultaneously drives the first lead screw. The synchronous rotation of screws 43 and 44 allows the first brake pad 41 and the second brake pad 42 to clamp the brake disc through threaded connections with screws 43 and 44, respectively. The distances between the first fixing ring 21 and the first brake pad 41, the second fixing ring 22 and the second brake pad 42 and the end of the brake disc to be tested are equal, ensuring that the brake disc is located in the middle of the two brake pads after fixing. This solves the problem that brake discs of different specifications are difficult to be in the middle of the two brake pads due to different thicknesses, enabling stable friction and wear performance testing of the brake disc, improving testing accuracy, and adapting to the testing of brake discs of different specifications. Example 2

[0053] The difference between this embodiment and the above embodiment is that the rotational speed of the first fixed ring 21 can be adjusted.

[0054] Reference Figure 8 Each of the two bases has a mounting plate fixed to it. A lead screw is rotatably connected to the two mounting plates, and a push block is threaded onto the lead screw. The push block is an arc-shaped block coaxial with the driving wheel 32, with one side of the driving wheel 32 located inside the arc-shaped block. A motor is fixed to one end of the lead screw. The motor drives the lead screw to rotate, thus moving the arc-shaped block and allowing the driving wheel 32 to slide along its own axis to the outside of the slide cylinder 212. The driving wheel 32 is a cylindrical friction wheel, and the driven wheel 33 is a conical friction wheel. The outer diameter of the driven wheel 33 gradually decreases or increases along its axis, and the side of the driven wheel 33 closest to the driving wheel 32 is parallel to the side wall of the sleeve. Speed ​​variation is achieved by adjusting the contact radius between the cylindrical and conical friction wheels.

[0055] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A device for testing the friction and wear performance of automotive brake discs, characterized in that, include: Workbench (1), the upper surface of the workbench (1) is fixedly provided with a bracket (11), and the bracket (11) is slidably connected with a slide (12). The fixing component (2) includes a first fixing ring (21) and a second fixing ring (22). The brake disc to be tested is fixedly connected between the first fixing ring (21) and the second fixing ring (22). The first fixing ring (21) is rotatably connected to the worktable (1) along its own axis. The second fixing ring (22) is slidably connected to the bracket (11) along its own axis. The slide (12) moves synchronously with the second fixing ring (22). The drive assembly (3) includes a rotary motor (31), a drive wheel (32) and a driven wheel (33). The rotary motor (31) is fixedly connected to the worktable (1). The output end of the rotary motor (31) is fixedly connected to the drive wheel (32) on the same axis. The drive wheel (32) is meshed with the driven wheel (33). The driven wheel (33) rotates synchronously on the same axis as the first fixed ring (21). The clamping assembly (4) includes a first brake pad (41), a second brake pad (42), a first lead screw (43), a second lead screw (44), and a clamping drive (45). The first brake pad (41) is threadedly connected to the first lead screw (43), the second brake pad (42) is threadedly connected to the second lead screw (44), the first lead screw (43) is rotatably connected to the bracket (11), the second lead screw (44) is rotatably connected to the slide (12), the first lead screw (43) and the second lead screw (44) are coaxially slidably connected, and the clamping drive (45) is used to drive the first lead screw (43) and the second lead screw (44) to rotate synchronously. The distance between the first fixing ring (21) and the first brake pad (41) and the end of the brake disc to be tested respectively is equal to the distance between the second fixing ring (22) and the end of the second brake pad (42) and the end of the brake disc to be tested respectively.

2. The device for testing the friction and wear performance of automotive brake discs according to claim 1, characterized in that: The axial length of the first fixing ring (21) is greater than the axial length of the wheel flange of the brake disc to be tested. The first fixing ring (21) is fixed with a number of positioning rods (211). The positioning rods (211) correspond one-to-one with the wheel hub bolt holes of the brake disc to be tested. The second fixing ring (22) is provided with a number of positioning holes (221) that correspond one-to-one with the positioning rods (211). The second fixing ring (22) is slidably connected with a number of inserts (231) in the positioning holes (221). The inserts (231) are sleeved on the outside of the positioning rods (211). The inserts (231) are fixedly connected to the end of the first fixing ring (21) near the first fixing ring (21). An elastic element (232) is fixed between the abutment plate (23) and the second fixing ring (22).

3. The device for testing the friction and wear performance of automotive brake discs according to claim 2, characterized in that: The first fixed ring (21) is fixed with a slide cylinder (212) at one end away from the second positioning ring (51). The driving wheel (32) is slidably connected to the outside of the slide cylinder (212) along its own axis. The driven wheel (33) gradually decreases or increases in outer diameter along the axis. The side of the driven wheel (33) close to the driving wheel (32) is parallel to the sleeve sidewall.

4. The device for testing the friction and wear performance of automotive brake discs according to claim 1, characterized in that: The upper end face of the workbench (1) is slidably connected to a slide rod (5). The slide rod (5) passes through the first fixed ring (21) and the second fixed ring (22) coaxially in sequence. A positioning ring (51) is sleeved on the outer wall of the slide rod (5). An end face bearing (52) is fixed at one end of the positioning ring (51) near the first fixed ring (21). The end face bearing (52) is used to abut against the end of the second fixed ring (22) away from the first fixed ring (21). The positioning ring (51) is detachably connected to the slide rod (5). A push ring (53) is fixed on the outside of the slide rod (5). The push ring (53) is located between the second fixed ring (22) and the first fixed ring (21).

5. The device for testing the friction and wear performance of automotive brake discs according to claim 4, characterized in that: A drive motor (58) is fixedly mounted on the upper surface of the workbench (1). A worm (57) is fixedly mounted on the drive motor (58) on the same axis. A worm wheel (56) is meshed with the worm (57). The worm wheel (56) is rotatably connected to the workbench (1). A drive gear (55) is fixedly mounted on the worm wheel (56) on the same axis. A tooth groove (54) that meshes with the drive gear (55) is opened on the outer wall of the end of the slide rod (5) away from the positioning ring (51).

6. The device for testing the friction and wear performance of automotive brake discs according to claim 1, characterized in that: The upper surface of the workbench (1) is slidably connected to a movable frame (6) along the axial direction of the first fixed ring (21). The movable frame (6) is fixedly connected to the slide (12). Two clamping components (7) with opposite sliding directions are vertically connected inside the movable frame (6). The two clamping components (7) are used to clamp the upper and lower ends of the brake disc to be tested respectively. The two clamping components (7) are symmetrically arranged along the horizontal plane where the axis of the first fixed ring (21) is located.

7. The device for testing the friction and wear performance of automotive brake discs according to claim 6, characterized in that: The clamping assembly (7) includes a sliding plate (71), a synchronization plate (72), and two clamping plates (73). The two clamping plates (73) are slidably connected to the sliding plate (71) in opposite sliding directions. The synchronization plate (72) is located between the two clamping plates (73). A connecting rod (74) is rotatably connected to one end of the synchronization plate (72) near the clamping plate (73). The end of the connecting rod (74) away from the synchronization plate (72) is rotatably connected to the clamping plate (73). A clamping block (75) is fixedly provided at one end of the clamping plate (73) near the synchronization plate (72). The clamping block (75) is used to abut and clamp the brake disc to be tested.

8. The device for testing the friction and wear performance of automotive brake discs according to claim 6, characterized in that: The second fixing ring (22) is fixed with a ring track (222) at one end away from the first fixing ring (21). The ring track (222) contains a plurality of discs (121). The discs (121) are fixed with a round rod (122) at one end away from the first fixing ring (21). The round rod (122) is fixedly connected to the moving frame (6) along the horizontal axis.

9. The device for testing the friction and wear performance of automotive brake discs according to claim 7, characterized in that: An elastic reset member (76) is fixed between the slide plate (71) and the synchronization plate (72). Several elastic reset members (76) are fixed at one end of the slide plate (71) near the synchronization plate (72). The synchronization plate (72) is located between several guide rods (77).

10. The device for testing the friction and wear performance of automotive brake discs according to claim 1, characterized in that: A rectangular rod (431) is fixed at one end of the first lead screw (43) near the second lead screw (44). The rectangular rod (431) passes through the second lead screw (44) and is rotatably connected to the bracket (11). The second lead screw (44) is slidably connected to the rectangular rod (431).

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