A test device for a differential of a gearbox

Abstract

This invention discloses a testing device for a gearbox differential in the field of differential testing technology. It includes a fixed fixture, on the top of which a differential is press-fitted with a mounting bracket. The differential also includes an input shaft positioned at the front and output half-shafts positioned on the left and right sides. Limit rings and splines are fixedly fitted onto the outer surfaces of both the output half-shafts and the input shaft. Connectors are fitted to the outer surfaces of the splines. Torque and speed sensors and a test motor are fixedly connected to the output half-shafts and the input shaft respectively via connectors. Test chambers are provided on both the left and right sides of the fixed fixture. This invention utilizes a compressed second spring, in conjunction with a movable plate, to drive a turntable to rotate. Through frictional engagement with a friction arc plate, it simulates the load on a vehicle during travel in a real-world scenario. By using motion to simulate stillness, it effectively simulates the actual load conditions of the differential, improving testing accuracy.

Description

Technical Field

[0001] This invention relates to the field of differential testing technology, specifically to a testing device for the differential of a gearbox. Background Technology

[0002] The differential in a transmission is a mechanism used to allow the left and right wheels of a car to rotate at different speeds. It mainly consists of planetary gears, half shafts, and a gear carrier. When a vehicle turns, the different turning radii of the left and right wheels cause a speed difference. The differential can prevent wheel slippage and wear, and also play a role in balancing and distributing torque. It is an important component of the vehicle. After the differential is designed and manufactured, it needs to be tested, mainly including torque transmission and speed transmission. Among them, the torque transmission test is an extremely important part, as it determines the connection performance of the differential.

[0003] Currently, the mainstream testing method typically involves connecting three motors to the input shaft and two output half-shafts of the differential, respectively, and testing the torque transmission effect of the differential by setting drive and load modes. Chinese invention patent application number CN114486244A discloses "A Differential Testing Device for Passenger Vehicle Transmission". By setting a tooling structure to avoid direct connection with the vehicle transmission and avoid the transmission assembly from restricting it, the device uses three motors and sets drive and load modes to simulate torque testing in real-world scenarios, thus improving the reliability of the test.

[0004] However, this test device requires the use of three motors, which has the following drawbacks: the load form of the two half-shafts is limited. After the input shaft receives power, the half-shaft of the differential also rotates through the two motors connected to it, using the speed difference to transmit torque. This results in many limitations in the test scenarios. For example, it cannot simulate the scenario of a vehicle starting and turning. When the half-shaft outputs power, the load formed by the motors connected to it cannot naturally generate a state of rotation from rest, resulting in incomplete test data. Furthermore, using the speed difference of the motors for torque testing is prone to damage to shaft parts due to electrical failures, which would disrupt the test process.

[0005] Therefore, this invention aims to solve the above-mentioned problems and proposes a novel test device for the differential of a gearbox. Summary of the Invention

[0006] The purpose of this invention is to provide a testing device for the differential of a gearbox, so as to solve the problems of small testing range and low accuracy mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a test device for a differential of a gearbox, comprising a fixed fixture, wherein a differential is mounted on the top of the fixed fixture by a mounting bracket, the differential further comprising an input shaft disposed at the front and output half-shafts disposed on the left and right sides, the outer surfaces of the output half-shafts and the input shaft are fixedly fitted with limit rings and splines, the outer surface of the splines is adapted to be snapped with connectors, the output half-shafts and the input shaft are respectively fixedly connected to a torque speed sensor and a test motor through connectors, test chambers are provided on the left and right sides of the fixed fixture, a connecting plate and a support column are rotatably mounted on the inner wall of the test chamber, a turntable and a support frame are fixedly fitted on the outer surface of the support column, a counterweight frame is movably fitted on the top of the test chamber, a friction arc plate is fixedly connected to the bottom of the counterweight frame, a placement groove is opened on the side of the connecting plate facing the support frame, a fixed plate is fixedly connected to the upper side of the inner wall of the placement groove, a second spring is fixedly connected to the front of the fixed plate, and a movable plate is elastically connected to the other end of the second spring, the movable plate being fixedly connected to the turntable.

[0008] As a further embodiment of the present invention, the turntable is fixedly sleeved on the middle part of the outer surface of the support column, the support frame is fixedly sleeved on one side of the support column located in the inner cavity of the test chamber, and both the front and rear sides of the support frame are adapted to press and contact the inner wall of the test chamber.

[0009] As a further embodiment of the present invention, the connector includes a connecting outer cylinder, a slot is provided at one end of the connecting outer cylinder facing the output half shaft, a connecting post and a No. 1 spring are movably sleeved inside the connecting outer cylinder at the end facing away from the output half shaft, the connecting post is elastically supported inside the connecting outer cylinder by the No. 1 spring, the connecting outer cylinder is fixedly connected to a torque and speed sensor, the connecting outer cylinder located on the front is fixedly connected to the output shaft of the test motor, and the spline adapter is snapped into the slot.

[0010] As a further embodiment of the present invention, the fixed plate and the movable plate have the same longitudinal cross-sectional shape and size, the movable plate is located at the bottom of the inner wall of the placement groove, the second spring is compressed and disposed between the fixed plate and the movable plate, and the width of the movable plate is greater than the width of the fixed plate.

[0011] As a further embodiment of the present invention, the friction arc plate is in the shape of a concave arc with its surface facing downwards, the diameter of the friction arc plate is equal to the diameter of the turntable, and the bottom of the friction arc plate is in contact with the outer surface of the turntable.

[0012] As a further embodiment of the present invention, the longitudinal cross-sectional shape of the top of the counterweight frame is gantry-shaped, and the front-to-back distance of the inner wall of the counterweight frame is equal to the diameter of the test chamber.

[0013] As a further embodiment of the present invention, the top of the fixed fixture is provided with support grooves on both the left and right sides, and the two output half shafts are rotatably supported inside the support grooves and pressed onto the inner wall of the fixed fixture by the mounting bracket.

[0014] As a further embodiment of the present invention, the cross-sectional shape of the connecting plate is "T" shaped, and a gap of 20MM to 30MM is left between the side of the connecting plate facing the support frame and the support frame.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] 1. This invention expands the testing range and improves the accuracy of the device by setting up a connecting plate and a turntable, which, in conjunction with a movable plate and a second spring, expands the testing range and improves the accuracy of the device. By setting up a second spring, when the output half-shaft outputs power, the second spring is compressed for a period of time, allowing the torque and speed sensor to perform a static force test during this period. This effectively tests the torque transmission performance of the differential when the vehicle starts, thus increasing the testing range. At the same time, the second spring, compressed to its limit, works with the movable plate to drive the turntable to rotate. Through friction with the friction arc plate, it simulates the load of the vehicle during movement in a real-world scenario. By using motion to simulate stillness, it effectively simulates the real load condition of the differential, thus improving the testing accuracy.

[0017] 2. The present invention also uses a counterweight frame to drive the friction arc plate to continuously exert downward pressure on the turntable, maintaining the constant value of the frictional resistance load during the rotation of the turntable. During the test, the output half shaft drives the connecting plate and the turntable to rotate. The turntable obtains a frictional resistance with a variation range of almost zero through mutual friction with the friction arc plate, which can effectively simulate the rotational load required by the connecting plate and improve the test efficiency of the device.

[0018] 3. The present invention also achieves convenience and stability in connection by setting a connector. By setting a spline and a slot to fit and engage, during connection, a No. 1 spring, in cooperation with the connecting post, applies pressure to the entire connecting outer cylinder, causing the spline to fit and engage into the inside of the slot under force. The cross-shaped fit between the slot and the spline ensures a stable connection during rotation. During disassembly, simply move the connecting outer cylinder axially away from the spline to detach the connection and release the connection relationship, making the device convenient and stable during connection. Attached Figure Description

[0019] Figure 1 This is a frontal perspective view of the overall structure of the present invention;

[0020] Figure 2 This is a top view of the overall structure of the present invention;

[0021] Figure 3This is a front sectional view of the overall structure of the present invention;

[0022] Figure 4 For the present invention Figure 3 Enlarged schematic diagram of the structure at point A;

[0023] Figure 5 This is a schematic diagram showing the separation of the fixed tooling, mounting bracket, differential, connector, and test motor of the present invention;

[0024] Figure 6 This is a schematic diagram showing the separation of the test chamber, connecting plate, counterweight frame, support column, turntable, support frame, friction arc plate, fixed plate, movable plate and No. 2 spring of the present invention;

[0025] Figure 7 This is a schematic diagram showing the distribution of the fixed plate, movable plate, and second spring inside the placement slot of the present invention.

[0026] The attached diagram lists the components represented by each number as follows:

[0027] 1. Fixed fixture; 2. Mounting bracket; 3. Differential; 4. Output half shaft; 5. Input shaft; 6. Connector; 61. Connecting outer cylinder; 62. Connecting column; 63. Spring No. 1; 64. Slot; 7. Test motor; 8. Limit ring; 9. Torque and speed sensor; 10. Test chamber; 11. Connecting plate; 12. Counterweight frame; 13. Support column; 14. Turntable; 15. Support frame; 16. Friction arc plate; 17. Placement slot; 18. Fixed plate; 19. Movable plate; 20. Spline; 21. Spring No. 2; 22. Support slot. Detailed Implementation

[0028] Please see Figure 1-7This invention provides a technical solution: a test device for a gearbox differential, comprising a fixed fixture 1, on the top of which a differential 3 is press-fitted by a mounting bracket 2. The differential 3 further includes an input shaft 5 positioned at the front and output half-shafts 4 positioned on the left and right sides. Limiting rings 8 and splines 20 are fixedly sleeved on the outer surfaces of both the output half-shafts 4 and the input shaft 5. Connectors 6 are fitted and snapped onto the outer surface of the splines 20. Torque and speed sensors 9 and test motors 7 are fixedly connected to the output half-shafts 4 and the input shaft 5 respectively via connectors 6. The fixed fixture 1 has various mounting brackets on its left and right sides. The test chamber 10 has a connecting plate 11 and a support column 13 rotatably mounted on its inner wall. The outer surface of the support column 13 is fixedly sleeved with a turntable 14 and a support frame 15. The top of the test chamber 10 is movably sleeved with a counterweight frame 12. The bottom of the counterweight frame 12 is fixedly connected with a friction arc plate 16. The connecting plate 11 has a placement groove 17 on the side facing the support frame 15. The upper side of the inner wall of the placement groove 17 is fixedly connected with a fixing plate 18. The front of the fixing plate 18 is fixedly connected with a second spring 21. The other end of the second spring 21 is elastically connected with a movable plate 19. The movable plate 19 is fixedly connected to the turntable 14.

[0029] When using this device, the output shaft of the test motor 7 is connected to the input shaft 5 via connector 6, the output half shaft 4 is connected to the torque and speed sensor 9 via connector 6, and the mounting bracket 2 is pressed and installed on the top of the fixed fixture 1 via bolts and fixed to complete the preparation work for the test.

[0030] During the test, the test motor 7 is started and power is transmitted to the differential 3, which then drives the output half-shaft 4 to rotate. The output half-shaft 4 drives the torque and speed sensor 9 and the connecting plate 11 to rotate, which in turn drives the fixed plate 18 to rotate. At this time, the second spring 21 is continuously compressed, and the turntable 14 remains stationary under the friction force generated by the pressure of the friction arc plate 16. At this time, the force reading of the torque and speed sensor 9 increases linearly, and the main load inside the test chamber 10 is not started. When the connecting plate 11 rotates 80° relative to the turntable 14, the second spring 21 is compressed to its limit, which then drives the movable plate 19, the turntable 14, the support column 13, and the support frame 15 to rotate together. At this time, the torque required to drive the connecting plate 11 to rotate increases. The test motor 7 maintains its initial speed, at which point the torque on the torque-speed sensor 9 increases. After the turntable 14 stabilizes, the torque on the torque-speed sensor 9 stabilizes. By observing the torque on the torque-speed sensor 9, the test results of the differential 3 can be obtained. Whether there is an imbalance in the torque transmission of the differential 3 can be determined by changing the weight of the two counterweights 12 to make them different. This changes the friction force on the turntable 14, thereby simulating the torque transmission under the actual load of the vehicle during cornering, improving the test accuracy. The addition of the second spring 21 allows for testing the torque transmission of the differential 3 during the starting phase of the vehicle from a standstill to a moving state, increasing the test range and improving the practicality of the device.

[0031] This invention expands the testing range and improves the accuracy of the device by setting up a connecting plate 11 and a turntable 14, which cooperate with the movable plate 19 and the second spring 21. By setting up the second spring 21, when the output half shaft 4 outputs power, the second spring 21 is compressed for a period of time, so that the torque speed sensor 9 is subjected to static force test during this period. This effectively tests the torque transmission performance of the differential 3 when the vehicle starts, and improves the testing range. At the same time, the second spring 21, which is compressed to its limit, cooperates with the movable plate 19 to drive the turntable 14 to rotate. Through frictional cooperation with the friction arc plate 16, it simulates the load of the vehicle in the real scenario during the movement. By using movement to drive stillness, it effectively simulates the real load of the differential 3 and improves the testing accuracy.

[0032] The present invention also uses a counterweight frame 12 to drive the friction arc plate 16 to continuously exert downward pressure on the turntable 14, thereby maintaining the constant value of the frictional resistance load during the rotation of the turntable 14. During the test, the output half shaft 4 drives the connecting plate 11 and the turntable 14 to rotate. The turntable 14 obtains a frictional resistance with a variation range of almost zero through mutual friction with the friction arc plate 16, which can effectively simulate the rotational load required by the connecting plate 11 and improve the test efficiency of the device.

[0033] Among them, the turntable 14 is fixedly sleeved on the middle of the outer surface of the support column 13, and the support frame 15 is fixedly sleeved on one side of the support column 13 located in the inner cavity of the test chamber 10. The front and rear sides of the support frame 15 are adapted to press and contact the inner wall of the test chamber 10.

[0034] One end of the support column 13 is rotatably mounted on the inner wall of the connecting plate 11, and the other end is fitted with a support frame 15. The two sides of the support frame 15 are in contact with the inner wall of the test chamber 10 by compression, thereby realizing the support function of the support column 13 and the turntable 14, thus providing a support environment for subsequent test operations.

[0035] The connector 6 includes a connecting outer cylinder 61. The end of the connecting outer cylinder 61 facing the output half shaft 4 has a slot 64. The connecting outer cylinder 61 facing away from the output half shaft 4 has a connecting post 62 and a first spring 63 movably sleeved inside. The connecting post 62 is elastically supported inside the connecting outer cylinder 61 by the first spring 63. The connecting outer cylinder 61 is fixedly connected to the torque and speed sensor 9. The connecting outer cylinder 61 on the front is fixedly connected to the output shaft of the test motor 7. The spline 20 is adapted to be snapped into the slot 64.

[0036] Move the entire connecting outer cylinder 61 toward the torque and speed sensor 9, compressing the first spring 63 and aligning the slot 64 with the spline 20. Then, loosen the connecting outer cylinder 61 and use the rebound force of the first spring 63 to press the connecting outer cylinder 61 toward the spline 20, causing the spline 20 to engage and snap into the slot 64, thus achieving the connection. The above connection method can connect the torque and speed sensor 9 to the output half-shaft 4 and the input shaft 5 to the test motor 7.

[0037] The present invention also achieves convenience and stability in connection by providing a connector 6. By providing a spline 20 that fits into a slot 64, during connection, a first spring 63, in cooperation with the connecting post 62, applies pressure to the entire connecting outer cylinder 61, causing the spline 20 to fit into the slot 64 under pressure. The cross-shaped fit between the slot 64 and the spline 20 ensures a stable connection during rotation. During disassembly, simply move the connecting outer cylinder 61 axially away from the spline 20 to detach the connection and release the connection relationship, making the device convenient and stable during connection.

[0038] Among them, the fixed plate 18 and the movable plate 19 have the same longitudinal cross-sectional shape and size. The movable plate 19 is located at the bottom of the inner wall of the placement groove 17. The second spring 21 is compressed between the fixed plate 18 and the movable plate 19. The width of the movable plate 19 is greater than the width of the fixed plate 18.

[0039] The fixed plate 18 is fixedly connected to the placement slot 17, while the movable plate 19 is movably snapped into the placement slot 17. The movable plate 19 is fixedly connected to the turntable 14. When the connecting plate 11 drives the fixed plate 18 to rotate, it will compress the second spring 21, thereby applying pressure to the movable plate 19. The turntable 14 connected to the movable plate 19 maintains the movable plate 19 in a stationary state through the gravity braking load formed by it and the friction arc plate 16. This makes the torque value measured by the torque speed sensor 9 increase linearly, which can more accurately test the static torque transmission efficiency of the differential 3.

[0040] Among them, the friction arc plate 16 is a concave arc with its surface facing downwards. The diameter of the friction arc plate 16 is equal to the diameter of the turntable 14. The bottom of the friction arc plate 16 is in contact with the outer surface of the turntable 14.

[0041] The bottom of the friction arc plate 16 contacts the outer surface of the turntable 14, and then, under the gravity of the counterweight frame 12, it provides pressure between the friction arc plate 16 and the turntable 14, so that frictional resistance is generated between the turntable 14 and the friction arc plate 16, forming a load similar to a brake. This load also has the advantage of constant load. When the turntable 14 rotates and rubs against the friction arc plate 16, the friction part of the friction arc plate 16 will be consumed. At this time, the counterweight frame 12 will automatically move down under the action of gravity to maintain a constant frictional pressure between the friction arc plate 16 and the turntable 14, thereby achieving the purpose of maintaining a constant load.

[0042] The longitudinal section of the top of the counterweight frame 12 is gantry-shaped, and the front-to-back distance of the inner wall of the counterweight frame 12 is equal to the diameter of the test chamber 10.

[0043] The gantry shape of the counterweight frame 12 can maintain its stability at the top of the test chamber 10. When the friction arc plate 16 is damaged by friction from the rotating turntable 14, the counterweight frame 12 uses gravity to keep the friction arc plate 16 and the turntable 14 in close contact, maintaining friction. At the same time, the counterweight frame 12 cannot rotate on the outer surface of the test chamber 10, and the front-to-back distance of its inner wall is the same as the diameter of the outer surface of the test chamber 10, so that the counterweight frame 12 can only move vertically downwards under the action of the friction arc plate 16, which helps to improve its stability during the movement.

[0044] Among them, the top left and right sides of the fixed fixture 1 are provided with support grooves 22, and the two output half shafts 4 are rotatably supported inside the support grooves 22 and are pressed and installed on the inner wall of the fixed fixture 1 by the mounting bracket 2.

[0045] Support groove 22 is used to provide rotational support for output half shaft 4, such as Figure 5As shown, when the mounting bracket 2 is pressed down, the outer surface of the output half shaft 4 remains entirely as a solid support. The bolt fixing method is stable and reliable. After the fixing fixture 1 and the mounting bracket 2 are installed in place, the housing of the differential 3 is fully supported, thereby increasing its stability and improving the stability of the device during the test. The installation of the differential 3 does not need to take into account the limitations of the gearbox assembly installed in the vehicle, greatly improving its flexibility.

[0046] The cross-sectional shape of the connecting plate 11 is "T" shaped, and there is a gap of 20mm to 30mm between the side of the connecting plate 11 facing the support frame 15 and the support frame 15.

[0047] The connecting plate 11 is rotatably mounted on the inner wall of the test chamber 10 via bearings. The pressure it receives comes entirely from the direction of rotation. Therefore, it does not require support in the vertical direction. Furthermore, since its left and right sides do not contact the inner wall of the test chamber 10, wear is avoided, service life is extended, and cost reduction is achieved.

[0048] Working principle:

[0049] When using this device, the output shaft of the test motor 7 is connected to the input shaft 5 via connector 6, the output half shaft 4 is connected to the torque and speed sensor 9 via connector 6, and the mounting bracket 2 is pressed and installed on the top of the fixed fixture 1 via bolts and fixed to complete the preparation work for the test.

[0050] During the test, the test motor 7 is started and power is transmitted to the differential 3, which then drives the output half-shaft 4 to rotate. The output half-shaft 4 drives the torque and speed sensor 9 and the connecting plate 11 to rotate, which in turn drives the fixed plate 18 to rotate. At this time, the second spring 21 is continuously compressed, and the turntable 14 remains stationary under the friction force generated by the pressure of the friction arc plate 16. At this time, the force reading of the torque and speed sensor 9 increases linearly, and the main load inside the test chamber 10 is not started. When the connecting plate 11 rotates 80° relative to the turntable 14, the second spring 21 is compressed to its limit, which then drives the movable plate 19, the turntable 14, the support column 13, and the support frame 15 to rotate together. At this time, the torque required to drive the connecting plate 11 to rotate increases. The test motor 7 maintains its initial speed, at which point the torque on the torque-speed sensor 9 increases. After the turntable 14 stabilizes, the torque on the torque-speed sensor 9 stabilizes. By observing the torque on the torque-speed sensor 9, the test results of the differential 3 can be obtained. Whether there is an imbalance in the torque transmission of the differential 3 can be determined by changing the weight of the two counterweights 12 to make them different. This changes the friction force on the turntable 14, thereby simulating the torque transmission under the actual load of the vehicle during cornering, improving the test accuracy. The addition of the second spring 21 allows for testing the torque transmission of the differential 3 during the starting phase of the vehicle from a standstill to a moving state, increasing the test range and improving the practicality of the device.

Claims

1. A test apparatus for a differential of a gearbox, comprising a fixing fixture (1), wherein a differential (3) is press-fitted onto the top of the fixing fixture (1) by a mounting bracket (2), the differential (3) further comprising an input shaft (5) disposed at the front and output half-shafts (4) disposed on the left and right sides, characterized in that: The outer surfaces of the output half-shaft (4) and the input shaft (5) are fixedly fitted with limit rings (8) and splines (20). The outer surface of the splines (20) is fitted with connectors (6). The output half-shaft (4) and the input shaft (5) are respectively fixedly connected to torque and speed sensors (9) and test motors (7) through connectors (6). Test chambers (10) are provided on both the left and right sides of the fixed fixture (1). The inner wall of the test chamber (10) is rotatably mounted with connecting discs (11) and support columns (13). The outer surface of the support columns (13) is fixedly fitted with turntables (11). 4) and support frame (15), the top of the test chamber (10) is movably sleeved with a counterweight frame (12), the bottom of the counterweight frame (12) is fixedly connected with a friction arc plate (16), the connecting plate (11) is provided with a placement groove (17) on the side facing the support frame (15), the upper side of the inner wall of the placement groove (17) is fixedly connected with a fixing plate (18), the front of the fixing plate (18) is fixedly connected with a second spring (21), the other end of the second spring (21) is elastically connected with a movable plate (19), and the movable plate (19) is fixedly connected with the turntable (14).

2. The test apparatus for the differential of a gearbox according to claim 1, characterized in that: The turntable (14) is fixedly sleeved on the middle of the outer surface of the support column (13), and the support frame (15) is fixedly sleeved on one side of the support column (13) located in the inner cavity of the test chamber (10). The front and rear sides of the support frame (15) are adapted to press and contact the inner wall of the test chamber (10).

3. The test apparatus for the differential of a gearbox according to claim 1, characterized in that: The connector (6) includes a connecting outer cylinder (61). The connecting outer cylinder (61) has a slot (64) at one end facing the output half shaft (4). The connecting outer cylinder (61) has a connecting post (62) and a first spring (63) movably sleeved inside the end facing away from the output half shaft (4). The connecting post (62) is elastically supported inside the connecting outer cylinder (61) by the first spring (63). The connecting outer cylinder (61) is fixedly connected to the torque speed sensor (9). The connecting outer cylinder (61) on the front is fixedly connected to the output shaft of the test motor (7). The spline (20) is adapted to be snapped into the slot (64).

4. The test apparatus for the differential of a gearbox according to claim 1, characterized in that: The fixed plate (18) and the movable plate (19) have the same longitudinal cross-sectional shape and size. The movable plate (19) is located at the bottom of the inner wall of the placement groove (17). The second spring (21) is compressed between the fixed plate (18) and the movable plate (19). The width of the movable plate (19) is greater than the width of the fixed plate (18).

5. The test apparatus for the differential of a gearbox according to claim 1, characterized in that: The friction arc plate (16) is a concave arc with its surface facing downwards. The diameter of the friction arc plate (16) is equal to the diameter of the turntable (14). The bottom of the friction arc plate (16) is in contact with the outer surface of the turntable (14).

6. The test apparatus for the differential of a gearbox according to claim 1, characterized in that: The longitudinal section of the top of the counterweight frame (12) is gantry-shaped, and the front-to-back distance of the inner wall of the counterweight frame (12) is equal to the diameter of the test chamber (10).

7. The test apparatus for the differential of a gearbox according to claim 1, characterized in that: The top left and right sides of the fixed fixture (1) are provided with support grooves (22), and the two output half shafts (4) are rotatably supported inside the support grooves (22) and pressed onto the inner wall of the fixed fixture (1) by the mounting bracket (2).

8. The test apparatus for the differential of a gearbox according to claim 1, characterized in that: The cross-sectional shape of the connecting plate (11) is "T" shaped, and there is a gap of 20MM~30MM between the side of the connecting plate (11) facing the support frame (15) and the support frame (15).

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