Testing device for differential mechanism of gearbox

Abstract

The invention relates to the technical field of differential tests, in particular to a gearbox differential test device which comprises a test box, two load adjusting mechanisms, a pressure adjusting mechanism, a road surface switching mechanism and a differential mechanism clamped and mounted at the top of the pressure adjusting mechanism. The road surface switching mechanism comprises two six-surface overturning tables which are rotatably mounted on two sides in the test box, a connecting rod is fixedly mounted between the two six-surface overturning tables, six groups of rotating rollers are rotatably mounted in the six-surface overturning tables, and a road surface belt is mounted on the outer sides of the six groups of rotating rollers in a surrounding manner; an intermittent transmission mechanism is fixedly installed on one side of one six-face overturning table. Through the built-in road surface conversion mechanism, the change of different road surface adhesive force can be simulated, the influence of the road holding force of the vehicle can be truly reflected, the load adjusting mechanism is driven by the pressure adjusting mechanism, the test load weight can be accurately controlled, and the performance test of the torque force of the differential mechanism under different loads can be simulated.

Description

Technical Field

[0001] The invention relates to the technical field of differential testing, in particular to a testing device for a differential of a gearbox. Background Art

[0002] The gearbox is one of the key components of a car. Its core function is to provide different speed and torque outputs to meet the power requirements of the vehicle under different road conditions and driving states. Among them, the differential is an important component of the gearbox. Its main function is to allow the drive wheels to rotate freely at different speeds, thereby ensuring flexible control of the vehicle when turning. The differential needs to be tested after design. The actual vehicle use conditions of the gearbox differential are simulated by a differential test device, and various performance tests of the differential are performed to verify. However, the existing differential test devices mainly focus on simulating the rotation and load conditions of the drive wheels under static conditions, and it is difficult to fully simulate the complex changes under actual driving conditions. For example, many current test devices lack the function of simulating road adhesion and cannot accurately reflect the impact of changes in grip during vehicle driving on the performance of the differential; in addition, the existing test devices can usually only test under the condition of a single load weight, and lack performance tests on the torque of the differential under different loads. Summary of the invention

[0003] The purpose of the present invention is to solve the shortcomings existing in the prior art, such as: in the current bridge maintenance process, there is a lack of effective vertical and bridge bottom area spraying capabilities, resulting in certain areas of the bridge, especially the bottom and vertical maintenance dead corners, cannot be effectively covered by the curing liquid, thereby affecting the overall maintenance effect, resulting in insufficient maintenance of some areas of the bridge, affecting the overall safety and durability of the bridge.

[0004] To achieve the above object, the present invention provides the following technical solutions: A test device for a differential of a gearbox, comprising a test box, two load adjustment mechanisms, a pressure regulating mechanism and a road surface conversion mechanism, and also comprising a differential mechanism mounted on the top of the pressure regulating mechanism by clamping, the road surface conversion mechanism being rotatably mounted inside the test box, the road surface conversion mechanism comprising two six-sided turning tables rotatably mounted on both sides inside the test box, a connecting rod being fixedly mounted between the two six-sided turning tables, six groups of rotating rollers being rotatably mounted inside the six-sided turning tables, road surface belts being mounted around the outer sides of the six groups of rotating rollers, an intermittent transmission mechanism being fixedly mounted on one side of one of the six-sided turning tables, the intermittent transmission mechanism using the connecting rod to drive the two six-sided turning tables to rotate synchronously, the position of the road surface belts being converted, and conversion of different simulated road conditions being realized; A second torque sensor is installed on both sides of the differential mechanism through a quick-connect assembly, and a wheel is installed on the other end of the second torque sensor through a shaft rod, and the wheel is located on the top of the road conversion mechanism. A test platform is fixedly installed on the top of the test box, and the two load adjustment mechanisms are respectively fixedly installed on the top of the test platform, and the two load adjustment mechanisms are fixedly connected to the pressure regulating mechanism; The pressure regulating mechanism includes a hydraulic cylinder fixedly installed at the bottom of the test platform, a lifting plate fixedly installed at the output end of the hydraulic cylinder, a mounting frame fixedly installed on the top of the lifting plate, and a driving mechanism fixedly installed on the top of the mounting frame. The pressure regulating mechanism drives the load adjustment mechanism to drive the two wheels to press down, thereby adjusting the test load of the differential mechanism.

[0005] Preferably, the load adjustment mechanism includes a support rod fixedly mounted on the top of the test platform, adjustment slots are opened on both sides of the support rod, an extended telescopic rod is movably mounted inside the support rod, a limit plate is fixedly mounted on the top of the telescopic rod, a hydraulic shock absorber is fixedly mounted on the top of the limit plate, a mounting seat is movably sleeved on the outer side of the telescopic rod through the limit plate, and a second torque sensor is fixedly mounted on the top of the mounting seat, a pressure plate is installed inside the telescopic rod through a slide groove, two sliders are fixedly mounted on both sides of the pressure plate, the two sliders are movably connected to the adjustment slots on both sides of the support rod, a fixing frame is fixedly mounted on one side of one of the sliders, and the fixing frame is fixedly connected to one side of the lifting plate, and a pressure sensor is fixedly mounted on the bottom inside the telescopic rod.

[0006] Preferably, the differential mechanism includes a mounting cover snap-fitted on the top of the lifting plate, an inspection cover is fixedly mounted on one side of the mounting cover, a differential assembly is rotatably mounted inside the mounting cover, the differential assembly includes a driven gear rotatably mounted inside the mounting cover, two mounting shaft frames are fixedly mounted on one side of the driven gear, two planetary gears are rotatably mounted on one side of the two mounting shaft frames, a left half-shaft gear and a right half-shaft gear are respectively meshed and connected on both sides of the two planetary gears, output shafts are fixedly mounted on both sides of the left half-shaft gear and the right half-shaft gear, a driving gear is meshed and connected on one side of the driven gear, and a transmission shaft is fixedly mounted on one side of the driving gear.

[0007] Preferably, the driving mechanism includes a driving motor A fixedly mounted on the top of the mounting frame, a first torque sensor is fixedly mounted on the output end of the driving motor A, and one end of the first torque sensor is fixedly connected to the transmission shaft.

[0008] Preferably, the intermittent transmission mechanism includes a driving motor B fixedly mounted on the outside of the test box, and a toggle disk fixedly mounted on one side of the six-sided turning table. A turntable is fixedly mounted on the output end of the driving motor B, a toggle rod is fixedly mounted on one side of the turntable, and the outer side of the turntable is rotatably connected to the toggle disk.

[0009] Preferably, the quick connect assembly includes a bayonet sleeve fixedly mounted on one end of the second torque sensor, wherein locking beads are equidistantly embedded in the interior of the bayonet sleeve, a locking sleeve is sleeved on the outer side of the bayonet sleeve, a reset spring is sleeved on the outer side of the bayonet sleeve, and a bayonet rod is inserted into the interior of the bayonet sleeve.

[0010] Preferably, a door is installed on the front of the test box through hinges, a controller is fixedly installed on the top of the test platform, and adjustment ports are opened on both sides of the inside of the test platform.

[0011] Compared with the prior art, the present invention has the following beneficial effects: The present invention drives two load adjustment mechanisms to move up and down through a pressure regulating mechanism. The two load adjustment mechanisms that move up and down adjust the load weight of the differential mechanism through a second torque sensor, which is convenient for testing the differential mechanism under conditions of different load weights, increases the adjustable performance of the device test load, can accurately control the test load weight of the differential mechanism, simulates the driving conditions of the vehicle under different loads, and realizes a more comprehensive test of the torque performance of the differential mechanism under different loads; through an intermittent transmission mechanism, a connecting rod is used to drive two six-sided turning tables to rotate synchronously, and the position of the road surface belt is changed to realize the conversion of different simulated road conditions, so that the wheels are tested under conditions of different road adhesion, and the performance parameters of the differential are monitored in real time through the second torque sensor and the first torque sensor, accurately reflecting the influence of the grip change during vehicle driving on the differential performance, and providing accurate data support for differential design and optimization through real-time monitoring of the differential performance parameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the internal structure of the present invention; Figure 3 It is a schematic diagram of the internal structure of the test box of the present invention; Figure 4 It is a schematic diagram of the structure of the pressure regulating mechanism of the present invention; Figure 5 It is a schematic diagram of the top view of the internal structure of the differential mechanism of the present invention; Figure 6 It is a schematic diagram of the internal structure of the load adjustment mechanism and the differential mechanism of the present invention; Figure 7 It is a schematic diagram of the connection structure between the differential assembly and the second torque sensor of the present invention; Figure 8 It is a schematic diagram of the internal structure of the quick-connect assembly of the present invention; Fig. 9 It is a schematic diagram of the structure of the quick-connect assembly of the present invention; Fig.10It is a schematic diagram of the connection structure between the load regulator and the lifting plate of the present invention; Fig.11 It is a schematic diagram of the internal structure of the load regulator of the present invention; Fig.12 It is a schematic diagram of the internal structure of the telescopic rod of the present invention; Fig.13 It is a schematic diagram of the connection structure between the driving mechanism and the differential mechanism of the present invention; Fig.14 It is a schematic diagram of the structure of the differential assembly of the present invention; Fig.15 It is a schematic diagram of the structure of the road surface conversion mechanism of the present invention; Fig.16 It is a schematic diagram of the internal structure of the road surface conversion mechanism of the present invention; Fig.17 It is a schematic diagram of the structure of the intermittent transmission mechanism of the present invention.

[0013] In the figure: 1. test box; 101. box door; 102. test platform; 103. controller; 104. adjustment port; 2. load adjustment mechanism; 201. support rod; 2011. adjustment slot; 202. telescopic rod; 2021. slider; 2022. pressure plate; 2023. fixing frame; 2024. pressure sensor; 2025. limit plate; 203. mounting seat; 204. hydraulic shock absorber; 3. pressure regulating mechanism; 301. hydraulic cylinder; 302. lifting plate; 303. mounting frame; 4. driving mechanism; 401. driving motor A; 402. first torque sensor; 5. differential mechanism; 501. mounting cover; 502. inspection cover; 503. differential assembly; 5031. driven Gear; 5032, mounting shaft frame; 5033, planetary gear; 5034, left half-shaft gear; 5035, right half-shaft gear; 5036, output shaft; 5037, driving gear; 5038, transmission shaft; 6, wheel; 601, second torque sensor; 602, quick-connect assembly; 6021, bayonet sleeve; 6022, lock bead; 6023, return spring; 6024, lock sleeve; 6025, bayonet rod; 603, shaft rod; 7, road surface conversion mechanism; 701, six-sided turning table; 702, road surface belt; 703, connecting rod; 704, intermittent transmission mechanism; 7041, driving motor B; 7042, turntable; 7043, lever; 7044, turntable; 705, rotating roller. DETAILED DESCRIPTION

[0014] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0015] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0016] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0017] See also Figure 1-17 The present invention provides a test device for a differential of a gearbox, comprising a test box 1, two load adjustment mechanisms 2, a pressure regulating mechanism 3 and a road surface conversion mechanism 7, and also comprising a differential mechanism 5 mounted on the top of the pressure regulating mechanism 3 by clamping, the road surface conversion mechanism 7 being rotatably mounted inside the test box 1, the road surface conversion mechanism 7 comprising two six-sided turning tables 701 rotatably mounted on both sides of the inside of the test box 1, a connecting rod 703 being fixedly mounted between the two six-sided turning tables 701, six groups of rotating rollers 705 being rotatably mounted inside the six-sided turning tables 701, and road surface belts 702 being mounted around the outer sides of the six groups of rotating rollers 705, an intermittent transmission mechanism 704 being fixedly mounted on one side of one of the six-sided turning tables 701, the intermittent transmission mechanism 704 using the connecting rod 703 to drive the two six-sided turning tables 701 to rotate synchronously, and the position of the road surface belt 702 is converted to realize conversion of different simulated road conditions; The second torque sensor 601 is installed on both sides of the differential mechanism 5 through the quick-connect assembly 602, and the other end of the second torque sensor 601 is installed with a wheel 6 through a shaft 603. The wheel 6 is located on the top of the road conversion mechanism 7. The top of the test box 1 is fixedly installed with a test platform 102. Two load adjustment mechanisms 2 are respectively fixedly installed on the top of the test platform 102. The two load adjustment mechanisms 2 are fixedly connected with the pressure regulating mechanism 3. The pressure regulating mechanism 3 includes a hydraulic cylinder 301 fixedly installed at the bottom of the test platform 102, a lifting plate 302 is fixedly installed at the output end of the hydraulic cylinder 301, a mounting frame 303 is fixedly installed on the top of the lifting plate 302, and a driving mechanism 4 is fixedly installed on the top of the mounting frame 303. The pressure regulating mechanism 3 drives the load adjusting mechanism 2 to drive the two wheels 6 to press down, and adjust the test load weight of the differential mechanism 5; The hydraulic cylinder 301 is powered on to drive the lifting plate 302 to move downward, and the downwardly moving lifting plate 302 drives the two load adjustment mechanisms 2 to move up and down. The two load adjustment mechanisms 2 that move up and down adjust the load weight of the differential mechanism 5 through the second torque sensor 601, which is convenient for the differential mechanism 5 to be tested under conditions of different load weights, increases the adjustable performance of the device test load, can accurately control the test load weight of the differential mechanism 5, simulates the driving conditions of the vehicle under different loads, and realizes a more comprehensive test of the torque performance of the differential mechanism 5 under different loads; the road surface belt 702 is installed by rotating The rotating roller 705 rotates and moves, and rotates under the rotating friction of the wheel 6, and the road surface belts 702 on the outer sides of the six groups of rotating rollers 705 are different road surfaces, and different road surfaces have different road surface adhesion. The intermittent transmission mechanism 704 uses the connecting rod 703 to drive the two six-sided turning tables 701 to rotate synchronously, and the position of the road surface belt 702 is converted to achieve conversion of different simulated road conditions, so that the wheel 6 can be tested under different road surface adhesion conditions, and the performance parameters of the differential assembly 503 are monitored in real time through the second torque sensor 601 and the first torque sensor 402, accurately reflecting the impact of the change in grip during vehicle driving on the differential performance.

[0018] like Fig.10 - Fig.12As shown, the load adjustment mechanism 2 includes a support rod 201 fixedly mounted on the top of the test platform 102, and adjustment slots 2011 are provided on both sides of the support rod 201. An extended telescopic rod 202 is movably mounted inside the support rod 201, and a limit plate 2025 is fixedly mounted on the top of the telescopic rod 202. A hydraulic shock absorber 204 is fixedly mounted on the top of the limit plate 2025. A mounting seat 203 is movably sleeved on the outer side of the telescopic rod 202 through the limit plate 2025, and the second torque sensor 601 The telescopic rod 202 is fixedly mounted on the top of the mounting seat 203, and a pressure plate 2022 is installed inside the telescopic rod 202 through a slide groove. Two sliders 2021 are fixedly installed on both sides of the pressure plate 2022, and the two sliders 2021 are movably connected to the adjustment grooves 2011 on both sides of the support rod 201. A fixing frame 2023 is fixedly installed on one side of one of the sliders 2021, and the fixing frame 2023 is fixedly connected to one side of the lifting plate 302. A pressure sensor 2024 is fixedly installed at the bottom of the telescopic rod 202; Among them, sliding grooves are provided on both sides of the telescopic rod 202 to provide a movable installation position for the pressure plate 2022, so that the pressure plate 2022 can drive the telescopic rod 202 to move telescopically and also facilitate the pressure plate 2022 to press the pressure sensor 2024, and the two sliders 2021 on both sides of the pressure plate 2022 move inside the adjustment groove 2011, which improves the stability of the movement of the pressure plate 2022. At the same time, the moving pressure plate 2022 is fixedly connected to the lifting plate 302 through a slider 2021. Therefore, when the hydraulic cylinder 301 is powered on and drives the lifting plate 302 to move downward, the downward moving pressure plate 2022 is The lifting plate 302 is driven by the fixed frame 2023 to cooperate with the slider 2021 to drive the pressure plate 2022 to move downward. The downwardly moved pressure plate 2022 applies pressure to the pressure sensor 2024 while driving the telescopic rod 202 to move downward. The downwardly moved telescopic rod 202 drives the mounting seat 203 to move downward through the limit plate 2025. The downwardly moved mounting seat 203 applies load weight to the shaft rod 603 and the wheel 6 through the second torque sensor 601, and detects the load in real time through the pressure sensor 2024, thereby achieving the purpose of accurately controlling the load test and improving the accuracy of the test data.

[0019] like Fig.13 , Fig.14As shown, the differential mechanism 5 includes a mounting cover 501 mounted on the top of the lifting plate 302, a maintenance cover 502 is fixedly mounted on one side of the mounting cover 501, a differential assembly 503 is rotatably mounted inside the mounting cover 501, and the differential assembly 503 includes a driven gear 5031 rotatably mounted inside the mounting cover 501, two mounting shaft frames 5032 are fixedly mounted on one side of the driven gear 5031, two planetary gears 5033 are rotatably mounted on one side of the two mounting shaft frames 5032, and the two planetary gears 5033 are respectively meshed with a left half-shaft gear 5034 and a right half-shaft gear 5035 on both sides of the two planetary gears 5033, and the output shaft 5036 is fixedly mounted on both sides of the left half-shaft gear 5034 and the right half-shaft gear 5035, and a driving gear 5037 is meshed with one side of the driven gear 5031, and a transmission shaft 5038 is fixedly mounted on one side of the driving gear 5037; The driving mechanism 4 drives the driving gear 5037 to rotate through the transmission shaft 5038, and the rotating driving gear 5037 drives the meshing driven gear 5031 to rotate. The rotating driven gear 5031 drives the two planetary gears 5033 to rotate through the two mounting shaft frames 5032. The two rotating planetary gears 5033 respectively drive the meshing left half-shaft gear 5034 and the right half-shaft gear 5035. The rotating left half-shaft gear 5034 and the right half-shaft gear 5035 respectively drive the two output shafts 5036 to rotate. The rotating two output shafts 5036 The torque force is transmitted to the two second torque sensors 601 through the quick-connect assembly 602. The two second torque sensors 601 transmit the torque force to the wheel 6 through the shaft 603, driving the wheel 6 to rotate on the road surface belt 702. The road surface belt 702 with different road adhesion is used to make the wheel 6 be tested under different road adhesion conditions. The torque force transmitted by the two output shafts 5036 is monitored in real time by the two second torque sensors 601, so as to realize real-time monitoring of the performance parameters of the differential assembly 503 and accurately reflect the influence of the grip change during vehicle driving on the differential performance.

[0020] like Figure 5 , Fig.13 As shown, the driving mechanism 4 includes a driving motor A401 fixedly mounted on the top of the mounting frame 303, a first torque sensor 402 is fixedly mounted on the output end of the driving motor A401, and one end of the first torque sensor 402 is fixedly connected to the transmission shaft 5038; Among them, the driving motor A401 is powered on and drives the transmission shaft 5038 to rotate through the first torque sensor 402, and the torque force exerted on the transmission shaft 5038 is detected in real time through the first torque sensor 402, and the monitoring electrical signal is transmitted to the controller 103 through the wire. At the same time, the two second torque sensors 601 monitor the torque force of the two output shafts 5036 in real time, and the electrical signals are transmitted to the controller 103 through the wire, and the torque test is performed by the torque difference monitored by the second torque sensor 601 and the first torque sensor 402.

[0021] like Fig.15 - Fig.17 As shown, the intermittent transmission mechanism 704 includes a driving motor B7041 fixedly mounted on the outside of the test box 1, and a toggle plate 7044 fixedly mounted on one side of the six-sided turning table 701, a rotating disk 7042 is fixedly mounted on the output end of the driving motor B7041, a toggle rod 7043 is fixedly mounted on one side of the rotating disk 7042, and the outer side of the rotating disk 7042 is engaged and rotatably connected with the toggle plate 7044; Among them, the driving motor B7041 is powered on to drive the turntable 7042 to rotate, and the rotating turntable 7042 drives the dial plate 7044 to perform indexing rotation through the dial rod 7043. The indexing rotating dial plate 7044 drives the six-sided turning table 701 to perform indexing rotation. The indexing rotating six-sided turning table 701 can automatically convert the pavement belt 702 in different positions.

[0022] like Figure 7 - Fig. 9 As shown, the quick-connect assembly 602 includes a bayonet sleeve 6021 fixedly mounted on one end of the second torque sensor 601, a locking bead 6022 is equidistantly embedded in the bayonet sleeve 6021, a locking sleeve 6024 is sleeved on the outer side of the bayonet sleeve 6021, a return spring 6023 is sleeved on the outer side of the bayonet sleeve 6021, and a bayonet rod 6025 is inserted into the bayonet sleeve 6021; Among them, the pin rod 6025 extends to the inside of the pin sleeve 6021 for pin connection, which is convenient for the second torque sensor 601 to transmit, and the locking sleeve 6024 is moved to resist the reset spring 6023 for compression, so that the locking sleeve 6024 is away from the locking ball 6022, so as to release the position lock of the locking ball 6022, and the unlocked locking ball 6022 can be moved to release the position lock of the pin rod 6025; when the position of the pin rod 6025 is locked, the pin rod 6025 is inserted into the inside of the pin sleeve 6021, the movement of the locking sleeve 6024 is released, and the locking sleeve 6024 is reset by the compression reset force of the reset spring 6023, the reset locking sleeve 6024 locks the position of the locking ball 6022, and the locked locking ball 6022 locks the position of the pin rod 6025, and the second torque sensor 601 is quickly disassembled and assembled through the quick connection assembly 602, which is convenient for the differential mechanism 5 to be quickly disassembled and assembled.

[0023] like Figure 1 - Figure 3 As shown, a door 101 is installed on the front of the test box 1 through a hinge, a controller 103 is fixedly installed on the top of the test platform 102, and adjustment ports 104 are opened on both sides of the inside of the test platform 102; Among them, opening the box door 101 facilitates the maintenance of the road surface conversion mechanism 7 inside the test box 1, thereby improving the maintenance efficiency of the device, and the controller 103 is electrically connected to the pressure sensor 2024, the hydraulic cylinder 301, the drive motor A401, the first torque sensor 402, the drive motor B7041 and the second torque sensor 601 through wires, which facilitates the operation of the intelligent control device, and the adjustment port 104 provides space for the six-sided flip table 701 to flip.

[0024] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A test device for a gearbox differential, comprising a test box (1), two load adjustment mechanisms (2), a pressure adjustment mechanism (3) and a road surface conversion mechanism (7), characterized in that: It also includes a differential mechanism (5) mounted on the top of the pressure regulating mechanism (3), the road surface conversion mechanism (7) being rotatably mounted inside the test box (1), the road surface conversion mechanism (7) comprising two six-sided turning tables (701) rotatably mounted on both sides inside the test box (1), a connecting rod (703) being fixedly mounted between the two six-sided turning tables (701), six groups of rotating rollers (705) being rotatably mounted inside the six-sided turning tables (701), road surface strips (702) being mounted around the outside of the six groups of rotating rollers (705), an intermittent transmission mechanism (704) being fixedly mounted on one side of one of the six-sided turning tables (701), the intermittent transmission mechanism (704) using the connecting rod (703) driving the two six-sided turning tables (701) to rotate synchronously, thereby converting the position of the road surface strips (702) and realizing conversion of different simulated road conditions; A second torque sensor (601) is installed on both sides of the differential mechanism (5) via a quick-connect assembly (602); a wheel (6) is installed on the other end of the second torque sensor (601) via a shaft (603); the wheel (6) is located on the top of the road surface conversion mechanism (7); a test platform (102) is fixedly installed on the top of the test box (1); the two load adjustment mechanisms (2) are respectively fixedly installed on the top of the test platform (102); and the two load adjustment mechanisms (2) are fixedly connected to the pressure regulating mechanism (3); The pressure regulating mechanism (3) comprises a hydraulic cylinder (301) fixedly mounted on the bottom of the test platform (102); a lifting plate (302) is fixedly mounted on the output end of the hydraulic cylinder (301); a mounting frame (303) is fixedly mounted on the top of the lifting plate (302); a driving mechanism (4) is fixedly mounted on the top of the mounting frame (303); the pressure regulating mechanism (3) drives the load regulating mechanism (2) to drive the two wheels (6) to be pressed downward, thereby adjusting the test load of the differential mechanism (5).

2. The differential test device for a gearbox according to claim 1, characterized in that: The load adjustment mechanism (2) comprises a support rod (201) fixedly mounted on the top of the test platform (102), adjustment slots (2011) being provided on both sides of the support rod (201), an extended telescopic rod (202) being movably mounted inside the support rod (201), a limit plate (2025) being fixedly mounted on the top of the telescopic rod (202), a hydraulic shock absorber (204) being fixedly mounted on the top of the limit plate (2025), a mounting seat (203) being movably sleeved on the outer side of the telescopic rod (202) via the limit plate (2025), and a second torque sensor (601) The telescopic rod (202) is fixedly mounted on the top of the mounting seat (203); a pressure plate (2022) is installed inside the telescopic rod (202) via a slide groove; two sliders (2021) are fixedly installed on both sides of the pressure plate (2022); the two sliders (2021) are movably connected to the adjustment grooves (2011) on both sides of the support rod (201); a fixing frame (2023) is fixedly installed on one side of one of the sliders (2021); the fixing frame (2023) is fixedly connected to one side of the lifting plate (302); and a pressure sensor (2024) is fixedly installed on the bottom inside the telescopic rod (202).

3. The differential test device for a gearbox according to claim 1, characterized in that: The differential mechanism (5) comprises a mounting cover (501) mounted on the top of the lifting plate (302), a maintenance cover (502) fixedly mounted on one side of the mounting cover (501), a differential assembly (503) rotatably mounted inside the mounting cover (501), the differential assembly (503) comprising a driven gear (5031) rotatably mounted inside the mounting cover (501), two mounting shaft frames (5032) fixedly mounted on one side of the driven gear (5031), and the two mounting shaft frames (503 2) are rotatably mounted on one side of the driven gear (5031), and the two sides of the two planetary gears (5033) are respectively meshed with a left half-shaft gear (5034) and a right half-shaft gear (5035). The output shaft (5036) is fixedly mounted on both sides of the left half-shaft gear (5034) and the right half-shaft gear (5035). The driving gear (5037) is meshed with one side of the driven gear (5031), and the transmission shaft (5038) is fixedly mounted on one side of the driving gear (5037).

4. The differential test device for a gearbox according to claim 3, characterized in that: The driving mechanism (4) comprises a driving motor A (401) fixedly mounted on the top of the mounting frame (303); a first torque sensor (402) is fixedly mounted on the output end of the driving motor A (401); and one end of the first torque sensor (402) is fixedly connected to the transmission shaft (5038).

5. The differential test device for a gearbox according to claim 1, characterized in that: The intermittent transmission mechanism (704) comprises a driving motor B (7041) fixedly mounted on the outside of the test box (1), and a toggle plate (7044) fixedly mounted on one side of the six-sided turning table (701); a turntable (7042) is fixedly mounted on the output end of the driving motor B (7041); a toggle rod (7043) is fixedly mounted on one side of the turntable (7042); and the outer side of the turntable (7042) is engaged and rotatably connected with the toggle plate (7044).

6. The differential test device for a gearbox according to claim 1, characterized in that: The quick-connect assembly (602) comprises a bayonet sleeve (6021) fixedly mounted on one end of the second torque sensor (601), wherein locking beads (6022) are equidistantly embedded and mounted inside the bayonet sleeve (6021), a locking sleeve (6024) is sleeved on the outside of the bayonet sleeve (6021), a return spring (6023) is sleeved on the outside of the bayonet sleeve (6021), and a bayonet rod (6025) is inserted inside the bayonet sleeve (6021).

7. The differential test device for a gearbox according to claim 1, characterized in that: The front of the test box (1) is provided with a box door (101) via hinges, a controller (103) is fixedly installed on the top of the test platform (102), and adjustment openings (104) are provided on both sides of the interior of the test platform (102).

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