A differential test equipment

Abstract

The present invention discloses a differential test device, including a test body and a differential, wherein the test device includes: a torque adjustment device, the torque adjustment device includes a brake device, a chain transmission mechanism and a connecting shaft mechanism; a mechanical arm loading and unloading device, the mechanical arm loading and unloading device includes a clamping device and a track motion device; and a quick disassembly mechanism. Compared with the prior art, the beneficial effects of the present invention are that the differential test device can automatically test the differential, and the mechanical arm loading and unloading device and the quick loading and unloading mechanism of the test device are used to automatically install and replace the differential, and the differential test load is automatically adjusted in the torque adjustment device, and the speed test mechanism is used to automatically detect and record the speeds of the two ends of the differential under different loads, so as to realize automatic loading and unloading and automatic detection of the differential, greatly improve the efficiency in the differential detection process, and ensure the accuracy in the differential detection process.

Description

Technical Field

[0001] The present invention belongs to the field of testing equipment, and in particular relates to a differential testing equipment. Background Art

[0002] A differential is a mechanism that enables the left and right, or front and rear, drive shafts to rotate at different speeds. During the differential production process, functional testing is required to ensure that the differential's speed shifting and load capacity meet the standards.

[0003] Manually testing a differential usually requires manually rotating the differential under no-load conditions to check its stability. The differential is then mounted on a test shaft and a load is applied to it to simulate actual operating conditions. A speed tester is then used to manually test the differential shafts in operation. The data is then manually recorded, taking multiple sets of speed data under load.

[0004] Manual differential testing is a complex and inefficient process. This slowdown directly increases the overall production time of differentials, reducing production efficiency. Manual differential testing involves the use of different test tools and scenarios, leading to significant errors in test data. These errors impact the accuracy of test data and directly affect production yields. Summary of the Invention

[0005] The object of the present invention is to provide a differential test device to solve the above problems.

[0006] To achieve the above objectives, the present invention provides a differential testing device comprising a test body and a differential. The test device includes: a torque adjustment device comprising a brake device, a chain drive mechanism, and a connecting shaft mechanism; a robotic arm loading and unloading device comprising a clamping device and a track motion device; a quick-release mechanism comprising a cylinder assembly, a movable shaft assembly, and a handle assembly; and a speed measuring mechanism comprising a fixed shaft measuring mechanism and a movable shaft measuring mechanism. The torque adjustment device is mounted within the test body, the speed measuring mechanism cooperates with the connecting shaft mechanism, the movable shaft assembly is mounted within the brake device, one end of the movable shaft assembly away from the brake device is mounted on the handle assembly, and the other end of the handle assembly is connected to the cylinder assembly.

[0007] In one or more embodiments of the present invention, the braking device includes a first hysteresis brake and a second brake, and the first hysteresis brake and the second brake are both fixedly connected to the lower end surface of the interior of the test body.

[0008] In one or more embodiments of the present invention, the connecting shaft mechanism includes a fixed shaft and a movable shaft, the fixed shaft is fixedly connected to the first hysteresis brake, the movable shaft is sleeved inside the second brake, the internal pin of the fixed shaft is connected to the first rotating shaft, and the internal pin of the movable shaft is connected to the second rotating shaft.

[0009] In one or more embodiments of the present invention, the chain transmission mechanism comprises a chain, a first sprocket, a speed regulating motor and a second sprocket, wherein the first sprocket is bolted with a sprocket adapter plate, and the sprocket adapter plate is provided with a flower-shaped groove.

[0010] In one or more embodiments of the present invention, the gripping device comprises a robotic arm, a robotic arm gripper is mounted on the robotic arm, and a maximum opening and closing distance of the robotic arm gripper is greater than the diameter of the differential.

[0011] In one or more embodiments of the present invention, the track motion device includes a robotic arm track, and a pair of undetected areas and a pair of detected areas are provided at both ends of the robotic arm track. The length of the robotic arm track is greater than the distance between the outer ends of the undetected area and the detected area.

[0012] In one or more embodiments of the present invention, the cylinder assembly includes a cylinder and a piston rod, and a connector is installed on the top end of the piston rod.

[0013] In one or more embodiments of the present invention, the movable shaft assembly includes a second rotating shaft and a movable shaft, the end of the movable shaft not connected to the second rotating shaft is connected to a rotating shaft seat, and the other end of the rotating shaft seat is sleeved with a ball head.

[0014] In one or more embodiments of the present invention, the handle assembly includes a quick-release handle and a quick-release base, a pair of first connecting plates are installed on the quick-release handle, the other ends of the pair of first connecting plates are connected to the connecting head, and a connecting shaft is installed on the quick-release base.

[0015] In one or more embodiments of the present invention, the fixed axis measuring mechanism includes a second speed measuring instrument, the movable axis measuring mechanism includes a first speed measuring instrument, and the surfaces of the fixed axis and the movable axis are provided with reflective strips that cooperate with the first speed measuring instrument and the second speed measuring instrument.

[0016] Compared with the prior art, the beneficial effects of the present invention are that the differential test equipment can automatically test the differential, cooperate with the mechanical arm loading and unloading equipment and the quick loading and unloading mechanism of the testing equipment to realize automatic installation and replacement of the differential, realize automatic adjustment of the differential test load in the torque adjustment equipment, and automatically detect and record the speeds of both ends of the differential under different loads through the speed testing mechanism, thereby realizing automatic loading and unloading and automatic testing of the differential, greatly improving the efficiency of the differential testing process, ensuring the accuracy of the differential testing process, and reducing large test errors caused by manual factors. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a structural diagram of a torque adjustment device of a differential test device in one embodiment of the present invention;

[0018] Figure 2 An exploded view of a torque adjustment device of a differential test device according to an embodiment of the present invention;

[0019] Figure 3 This is a structural diagram of a differential test device in one embodiment of the present invention;

[0020] Figure 4 A structural diagram of a mechanical arm device of a differential test device according to an embodiment of the present invention;

[0021] Figure 5 A first structural diagram of a testing mechanism of a differential testing device according to an embodiment of the present invention;

[0022] Figure 6 A second structural diagram of a testing mechanism of a differential testing device according to an embodiment of the present invention;

[0023] Figure 7 This is a structural diagram of a quick assembly and disassembly mechanism of a differential test device according to an embodiment of the present invention;

[0024] Figure 8 This is an exploded view of a quick assembly and disassembly mechanism of a differential test device in one embodiment of the present invention.

[0025] Description of main reference numerals:

[0026] 1-Test body, 101-First load regulator, 1011-Second load regulator, 102-Motor control box, 103-Speed ​​test box, 1031-Speed ​​display, 104-Visual sensor, 105-Through hole, 106-First speed tester, 1061-Second speed measuring instrument, 2-Robot arm, 201-Robot arm gripper, 202-Robot arm track, 3-Quick release base, 301-Quick release handle, 302-Connecting shaft, 303-First connecting plate, 304-Second connecting plate, 4-Cylinder , 401-piston rod, 402-connector, 403-cylinder control box, 5-undetected area, 501-differential slot, 6-detected area, 7-first hysteresis brake, 701-fixed shaft, 702-first rotating shaft, 8-second brake, 801-second rotating shaft, 802-movable shaft, 803-rotating shaft seat, 804-ball head, 9-chain, 901-first sprocket, 902-sprocket adapter plate, 9021-flower groove, 11-speed control motor, 1101-second sprocket, 12-differential. DETAILED DESCRIPTION

[0027] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific embodiments.

[0028] refer to Figure 1-Figure 3 As shown, the present invention provides a differential testing device, which uses a robotic arm 2 to pick up and place the differential 12 in the untested area 5 and the tested area 6, clamps the untested differential 12 and places it between a pair of hysteresis brakes respectively connected to a fixed shaft 701 and a movable shaft 802, uses a cylinder assembly to control a quick disassembly mechanism to quickly install and remove the differential 12, and after the speed is measured and recorded by the speed measuring mechanism under the operation of the torque adjustment device, the robotic arm places the tested differential 12 in the tested area 6, and the cycle is repeated.

[0029] refer to Figure 4 As shown, one robot arm 2 can perform synchronous testing on two test production lines at the same time. The robot arm 2 moving through the robot arm track 202 can operate the clamping work of the differentials 12 on the two test production lines within the range of the robot arm track 202, thereby improving the efficiency of differential testing.

[0030] The differential test equipment includes: torque adjustment equipment, robotic arm loading and unloading equipment, quick disassembly mechanism and speed measurement mechanism.

[0031] refer to Figure 1-Figure 3As shown, the torque adjustment device is used to apply different torques to both ends of the differential 12 at the same time, and perform multi-segment torque movement under the control of the first load regulator 101 and the motor control box 102, providing different speed scenarios and multiple sets of measurement data for the measurement of the differential 12. The unified speed scenario is used to reduce errors in the test process and improve the accuracy of the measurement of the differential 12. The torque adjustment device includes a braking device, a chain transmission mechanism and a connecting shaft mechanism.

[0032] The robotic arm handling device is used to pick up the differential 12 from the untested area 5 and place it in the torque adjustment device. Finally, the tested differential 12 is removed from the torque adjustment device and placed in the corresponding position in the tested area 6, repeating the process. The robotic arm handling device can operate two differential test lines simultaneously, significantly improving differential testing efficiency and accuracy. The robotic arm handling device includes a gripping device and a track motion device.

[0033] The quick-release mechanism is used to quickly and conveniently clamp and release the differential 12 in conjunction with the gripping of the robotic arm loading and unloading device. After the robotic arm loading and unloading device is placed, the differential 12 is automatically clamped. After measurement is completed and the robotic arm is re-clamped, the differential 12 is quickly disassembled and separated, facilitating removal of the differential 12 by the robotic arm loading and unloading device and installation of a new differential 12. The quick-release mechanism, in conjunction with the robotic arm loading and unloading device, speeds up the replacement and installation of the differential 12. The quick-release mechanism includes a cylinder assembly, a movable shaft assembly, and a handle assembly.

[0034] The speed measuring mechanism is used to measure the speeds of different rotating shafts at both ends of the differential 12 in the torque adjustment device. The quality of the differential 12 is judged by measuring the speeds at both ends of the differential 12 under different torque environments. In conjunction with the torque adjustment device, the differential 12 can be conveniently tested and speed data under multiple sets of torque environments can be recorded. The speed measuring mechanism includes a fixed shaft measuring mechanism and a movable shaft measuring mechanism.

[0035] refer to Figure 1-Figure 2As shown, the braking device includes a first hysteresis brake 7 and a second brake 8. These utilize existing technology and are torque control components that generate torque by inputting an excitation current using the principle of hysteresis. Both the first and second hysteresis brakes 7 and 8 are fixedly attached to the lower end surface of the test body 1. A first load adjuster 101 and a second load adjuster 1011 are mounted on the test body 1. The first load adjuster 101 interacts with the first hysteresis brake 7, while the second load adjuster 1011 interacts with the second brake 8. The torque generated by the first and second hysteresis brakes 7 and 8 can be manually adjusted using knobs on the first and second load adjusters 101 and 1011, respectively. The torque can also be automatically adjusted according to a program, facilitating multiple testing of the differential 12. The differential 12 achieves varying speeds through the loads applied by the first and second hysteresis brakes 7 and 8 at both ends.

[0036] refer to Figure 1-Figure 2 As shown, the connecting shaft mechanism is used to drive the connection between the brake device and the differential 12, and includes a fixed shaft 701 and a movable shaft 802. The fixed shaft 701 is fixedly connected to the first hysteresis brake 7, and the movable shaft 802 is sleeved inside the second brake 8. The first hysteresis brake 7 and the second brake 8 are both fixedly connected to the bottom of the test body 1. The fixed shaft 701 is fixed to the first hysteresis brake 7 and cannot move, while the movable shaft 802 is sleeved inside the second brake 8 and can move inside the second brake 8, facilitating the rapid clamping and disassembly of the differential 12 in conjunction with the handle assembly. The fixed shaft 701 is internally pinned to the first rotating shaft 702, and the movable shaft 802 is internally pinned to the second rotating shaft 801. The differential 12 is mounted between the first rotating shaft 702 and the second rotating shaft 801, and the first rotating shaft 702 and the second rotating shaft 801 cooperate with the ends of the differential 12. The two ends of the first rotating shaft 702 are respectively connected to the fixed shaft 701 and the differential 12, and the two ends of the second rotating shaft 801 are respectively connected to the movable shaft 802 and the differential 12. The first rotating shaft 702 and the second rotating shaft 801 are respectively connected to the first hysteresis brake 7 and the second brake 8, that is, the first rotating shaft 702 and the second rotating shaft 801 respectively connect the first hysteresis brake 7 and the second brake 8 to the two ends of the differential 12, and synchronously transmit load to the two ends of the differential 12, so that the differential 12 can achieve different speed changes.

[0037] refer to Figure 1-Figure 2As shown, the chain transmission mechanism includes a chain 9, a first sprocket 901, a speed-regulating motor 11, and a second sprocket 1101. A motor control box 102 is mounted on the test body 1, which is compatible with the speed-regulating motor 11. The motor control box 102 is used to control the speed of the speed-regulating motor 11. The speed-regulating motor 11 can be manually controlled by turning a knob on the motor control box 102. The motor control box 102 also automatically adjusts the speed of the speed-regulating motor 11 according to a program, coordinating with the first load regulator 101 and the second load regulator 1011 to control the torque of the first hysteresis brake 7 and the second brake 8, thereby facilitating the measurement of test data for multiple sets of differentials 12. The chain 9 is compatible with both the first sprocket 901 and the second sprocket 1101. Both ends of the chain 9 are mounted on the first sprocket 901 and the second sprocket 1101. The first sprocket 901 is keyed to the first rotating shaft 702, and the second sprocket 1101 is keyed to the speed-regulating motor 11. That is, the chain 9 transmits power from the speed regulating motor 11 to the connecting shaft mechanism through the first sprocket 901 and the second sprocket 1101. A sprocket adapter plate 902 is installed on the first sprocket 901. The first sprocket 901 and the sprocket adapter plate 902 are bolted together. A flower-shaped groove 9021 is provided on the sprocket adapter plate 902. The flower-shaped groove 9021 cooperates with the side of the differential 12 close to the first rotating shaft 702. That is, the chain 9 transmits power to the differential 12, and the differential 12 moves synchronously with the rotation of the chain 9. The first rotating shaft 702 passes through the first sprocket 901 and the sprocket adapter plate 902 and is inserted into one end of the differential 12 and cooperates with the differential 12.

[0038] refer to Figure 3-Figure 4As shown, the clamping device includes a robotic arm 2, which can perform multi-axis rotation and is used to load and unload the differential 12, clamp the untested differential 12 from the untested area 5 into the torque adjustment device, and clamp the tested differential 12 after the test is completed and place it in the corresponding position of the tested area 6, and repeat the cycle. A robotic arm clamp 201 is installed on the robotic arm 2. The robotic arm clamp 201 cooperates with the force sensor, displacement sensor, angle sensor and force feedback wrist connector on the robotic arm 2 to accurately clamp and place the differential 12. The maximum opening and closing distance of the robotic arm clamp 201 is greater than the diameter of the differential 12. After opening, the robotic arm clamp 201 can clamp the outer surface of the differential 12 and insert the end of the differential 12 with the flower-shaped connection part into the flower-shaped groove 9021 on the sprocket adapter plate 902, and then assemble The quick-disassembly mechanism is engaged to tighten the differential 12, and a visual sensor 104 that cooperates with the robotic arm 2 is installed on the test body 1. The visual sensor 104 uses vision to detect the degree of fit between the differential 12 and the flower groove 9021. When the differential 12 interferes with the flower groove 9021 during the insertion process, the visual sensor 104 performs angle recognition and sends data to the robotic arm 2, and controls the two-dimensional force feedback wrist connector on the robotic arm 2 to twist the robotic arm clamp 201 so that the differential 12 can be smoothly inserted into the flower groove 9021.

[0039] refer to Figure 3-Figure 4 As shown, the track motion device includes a robotic arm track 202, with a pair of untested zones 5 and a pair of tested zones 6 at both ends. The track motion device supports the robotic arm 2 to synchronously operate and clamp the two test production lines. The pair of untested zones 5 and the pair of tested zones 6 are provided with a plurality of differential slots 501. The differentials 12 are placed in the corresponding differential slots 501 according to their numbers. The robotic arm 2 moves on the robotic arm track 202 to clamp the differentials 12 from the corresponding differential slots 501 in the untested zone 5 and, after testing, to the corresponding differential slots 501 in the tested zone 6. The length of the robotic arm track 202 is greater than the distance between the outer ends of the untested zone 5 and the tested zone 6, so that the robotic arm 2 has sufficient movement range to complete the above-mentioned test production line operations.

[0040] refer to Figure 5-Figure 8As shown, the cylinder assembly includes a cylinder 4 and a piston rod 401. The cylinder assembly is used to cooperate with the handle assembly to achieve rapid clamping and quick disassembly of the differential 12. The handle assembly is pushed and pulled back by the displacement of the piston rod 401, thereby achieving operation of the handle assembly through the cylinder assembly. A cylinder control box 403 is installed below the cylinder 4. The cylinder control box 403 is used to control the cylinder 4 and operate the extension and retraction of the piston rod 401 relative to the cylinder 4 under program control. The cylinder control box 403 cooperates with the cylinder 4 to achieve installation and disassembly of the differential 12. A connector 402 is installed at the top of the piston rod 401. The connector 402 is provided with a hole. The piston rod 401 and the handle assembly are connected and move in conjunction with each other through the connector 402.

[0041] refer to Figure 7-Figure 8 As shown, the movable shaft assembly is used to simultaneously rotate with the second brake 8 and move along the interior of the second brake 8. The second rotating shaft 801 engages and disengages with one end of the differential 12, enabling rapid installation and removal of the differential 12. The movable shaft assembly includes a second rotating shaft 801 and a movable shaft 802. The second rotating shaft 801 and the movable shaft 802 are fixedly connected. The movable shaft 802 is slidably sleeved within the second brake 8 and can move perpendicularly to the second brake 8. That is, the second rotating shaft 801 can move perpendicularly to the second brake 8. The end of the movable shaft 802 that is not connected to the second rotating shaft 801 is connected to a rotating shaft seat 803, and the rotating shaft seat 803 is interference fit with the movable shaft 802. The other end of the rotating shaft seat 803 is sleeved with a ball head 804. The movable shaft assembly can move synchronously with the ball head 804 and rotate asynchronously with the ball head 804 when the movable shaft assembly rotates. The movable shaft assembly is connected to the handle assembly through the ball head 804, and cooperates with the handle assembly to move perpendicular to the direction of the second brake 8.

[0042] refer to Figure 7-Figure 8As shown, the handle assembly connects the cylinder assembly above and the movable shaft assembly on one side. The handle assembly includes a quick-release handle 301 and a quick-release base 3. A pair of first connecting plates 303 are mounted on the quick-release handle 301, and the other ends of the first connecting plates 303 are connected to the connector 402. The piston rod 401 performs telescopic movement and drives the quick-release handle 301 to move synchronously via the first connecting plates 303. The quick-release handle 301 is rotatably connected to the quick-release base 3. A connecting shaft 302 is mounted on the quick-release base 3. One end of the connecting shaft 302 is threadedly connected to a ball head 804, and the other end is connected to a second connecting plate 304. The other end of the second connecting plate 304 is connected to the quick-release handle 301. Rotating the quick-release handle 301 can achieve displacement of the connecting shaft 302. When the piston rod 401 in the cylinder 4 extends and retracts, the first connecting plate 303 connected thereto drives the quick-release handle 301 to rotate. During this rotation, the quick-release handle 301 synchronously pushes and pulls the connecting shaft 302 via the second connecting plate 304 mounted thereon, thereby controlling the displacement of the movable shaft assembly through the displacement of the cylinder assembly, and ultimately completing the installation and removal of the differential 12. If the cylinder 4 becomes inoperative or malfunctions, the connector 402 can be disconnected from the first connecting plate 303, and the quick-release handle 301 can be manually controlled to rotate to install or remove the differential 12.

[0043] refer to Figure 5-Figure 6 As shown, the measuring mechanism is used to measure and record the rotational speeds at both ends of the differential 12 when the brakes at both ends cause the differential 12 to produce different rotational speeds. The measuring mechanism includes a first rotational speed tester 106 and a second rotational speed tester 1061. The fixed shaft 701 cooperates with the second rotational speed tester 1061, and the movable shaft 802 cooperates with the first rotational speed tester 106. The first rotational speed tester 106 and the second rotational speed tester 1061 measure the movable shaft 802 and the fixed shaft 701 respectively. Reflective strips that cooperate with the first rotational speed tester 106 and the second rotational speed tester 1061 are provided on the surfaces of the fixed shaft 701 and the movable shaft 802. The first rotational speed tester 106 and the second rotational speed tester 1061 measure real-time data by irradiating the reflective strips at corresponding positions. The test body 1 is equipped with a speed test box 103 that cooperates with 601 and the second speed measuring instrument 1061. The measuring mechanism transmits the real-time measured data to the speed test box 103 for storage and analysis. The speed test box 103 is provided with a speed display screen 1031. The speed display screen 1031 can display the measurement data and pass rate of this group in real time, which is convenient for technical personnel to observe.

[0044] During specific use, the robotic arm 2 clamps the differential 12 to be tested from the untested area 5 into the torque adjustment device, and places the differential 12 in the flower-shaped groove 9021. The robotic arm clamp 201 is kept clamped, and the cylinder assembly is activated to push out the piston rod 401, which drives the quick release handle 301 on the handle assembly to move synchronously, pushing out the movable shaft assembly connected to the handle assembly so that it cooperates with one side of the differential 12 to complete the installation of the differential 12. After the robotic arm clamp 201 finishes clamping, the motor control box 102 controls the speed regulating motor 11 to rotate and synchronously drive the differential 12 to rotate through the chain assembly. During this process, the braking equipment provides load to the differential 12 from both ends, so that the differential 12 achieves different speed changes under the load of the braking equipment at both ends. The speed changes are measured and recorded in real time by the measuring mechanism. After the test is completed, the robot arm gripper 201 grips the tested differential 12 and, after the cylinder assembly drives the handle assembly to separate the movable shaft from the differential 12, the tested differential 12 is placed at the corresponding position on the tested area 6 to complete the test of one differential 12. The robot arm 2 can cooperate with the track motion equipment to operate two test production lines simultaneously, greatly improving the efficiency and accuracy of the test.

[0045] Compared with the prior art, the beneficial effects of the present invention are that the differential test equipment can automatically test the differential, cooperate with the mechanical arm loading and unloading equipment and the quick loading and unloading mechanism of the testing equipment to realize automatic installation and replacement of the differential, realize automatic adjustment of the differential test load in the torque adjustment equipment, and automatically detect and record the speeds of both ends of the differential under different loads through the speed testing mechanism, thereby realizing automatic loading and unloading and automatic testing of the differential, greatly improving the efficiency of the differential testing process, ensuring the accuracy of the differential testing process, and reducing large test errors caused by manual factors.

[0046] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0047] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A differential test device, comprising a test body and a differential, characterized in that: The test equipment includes: A torque regulating device, the torque regulating device comprising a braking device, a chain transmission mechanism and a connecting shaft mechanism; A robotic arm loading and unloading device, the robotic arm loading and unloading device comprising a gripping device and a track motion device; A quick disassembly mechanism, the quick disassembly mechanism comprising a cylinder assembly, a movable shaft assembly and a handle assembly; A rotation speed measuring mechanism, the rotation speed measuring mechanism comprising a fixed shaft measuring mechanism and a movable shaft measuring mechanism, The torque adjustment device is installed inside the machine body, the speed measuring mechanism cooperates with the connecting shaft mechanism, the movable shaft assembly is installed inside the braking device, one end of the movable shaft assembly away from the braking device is installed on the handle assembly, and the other end of the handle assembly is connected to the cylinder assembly.

2. A differential test device according to claim 1, characterized in that: The braking device comprises a first hysteresis brake and a second brake, wherein the first hysteresis brake and the second brake are both fixedly connected to the lower end surface of the inner part of the testing body.

3. A differential test device according to claim 2, characterized in that: The connecting shaft mechanism includes a fixed shaft and a movable shaft, the fixed shaft is fixedly connected to the first hysteresis brake, the movable shaft is sleeved inside the second brake, the internal pin of the fixed shaft is connected to the first rotating shaft, and the internal pin of the movable shaft is connected to the second rotating shaft.

4. A differential test device according to claim 3, characterized in that: The chain transmission mechanism comprises a chain, a first sprocket, a speed regulating motor and a second sprocket. The first sprocket is bolted with a sprocket adapter plate, and the sprocket adapter plate is provided with a flower-shaped groove.

5. The differential test equipment according to claim 1, characterized in that: The clamping device comprises a mechanical arm, on which a mechanical arm clamp is mounted, and the maximum opening and closing distance of the mechanical arm clamp is greater than the diameter of the differential.

6. A differential test device according to claim 5, characterized in that: The track motion device comprises a robot track, a pair of undetected areas and a pair of detected areas are arranged at two ends of the robot track, and the length of the robot track is greater than the distance between the outer ends of the undetected area and the detected area.

7. A differential test device according to claim 1, characterized in that: The cylinder assembly comprises a cylinder and a piston rod, and a connector is installed on the top end of the piston rod.

8. A differential test device according to claim 7, characterized in that: The movable shaft assembly comprises a second rotating shaft and a movable shaft, one end of the movable shaft not connected to the second rotating shaft is connected to a rotating shaft seat, and the other end of the rotating shaft seat is sleeved with a ball head.

9. A differential test device according to claim 8, characterized in that: The handle assembly comprises a quick-release handle and a quick-release base. A pair of first connecting plates are installed on the quick-release handle. The other ends of the pair of first connecting plates are connected to the connecting head. A connecting shaft is installed on the quick-release base.

10. The differential test equipment according to claim 1, characterized in that: The fixed shaft measuring mechanism includes a second rotation speed measuring instrument, and the movable shaft measuring mechanism includes a first rotation speed measuring instrument. The surfaces of the fixed shaft and the movable shaft are provided with reflective strips that match the first rotation speed measuring instrument and the second rotation speed measuring instrument.

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