Drive axle test system and test method

Abstract

The present invention relates to a drive axle test system and a test method; the system includes a second rear axle, a second rear axle and a drive mechanism, the second output end of the second rear axle is connected to the second output end of the second rear axle through a connecting piece, the second output end of the second rear axle is connected to the third torque machine, the output end of the drive mechanism is transmission-connected to the input end of the inter-axle differential and the input end of the second rear axle, and the output end of the inter-axle differential is connected to the fourth torque machine; the drive axle test system of the present application, since the second rear axle can cooperate with the inter-axle differential to form a mid-axle structure, when the inter-axle differential is in a locked state, the drive mechanism can simultaneously drive the second rear axle and the second rear axle to move, thereby achieving the test purpose of the second rear axle and the second rear axle, and when the inter-axle differential is in an unlocked state, the drive mechanism achieves the test purpose of the second rear axle and the mid-axle structure formed by the second rear axle and the inter-axle differential while giving driving force to the inter-axle differential.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile axles, and in particular to a drive axle test system and a test method. Background Art

[0002] Drive axles are used in vehicles and typically consist of a final drive, differential, wheel drive system, and axle housing. These structures redirect power, transferring the engine's torque through the final drive, differential, and axle shafts to the drive wheels, reducing speed while increasing torque. Therefore, drive axle performance is a crucial indicator of vehicle performance.

[0003] When a drive axle is put into service, it is tested to determine whether it meets the requirements. Existing drive axle testing systems can simultaneously test both the center and rear axles of a vehicle. During testing, the center and rear axles are connected in series, simulating the actual vehicle's layout. A motor + transmission system is then used for power input, and four torque machines are used to apply torque to the left and right wheels of the center axle and the left and right wheels of the rear axle. Test results are then obtained by observing the degree of wear on the center and rear axles.

[0004] However, this drive axle test system cannot test both rear drive axles of a vehicle at the same time, and for heavy-duty drive axles with large torque, when the output torque of the drive axle exceeds the load capacity of the torque machine, it is easy to cause damage to the torque machine. Summary of the Invention

[0005] Based on this, it is necessary to provide a drive axle test system and test method to address the above-mentioned problems of not being able to test two rear drive axles at the same time and inconvenience in testing heavy drive axles with large torque.

[0006] A drive axle test system, comprising:

[0007] a first rear axle, wherein an input end of the first rear axle is connected to a first torque machine, and a first output end of the first rear axle is connected to a second torque machine;

[0008] a second rear axle, wherein a first output end of the second rear axle is connected to a second output end of the first rear axle via a connecting member, and the second output end of the second rear axle is connected to a third torque machine;

[0009] A drive mechanism, wherein the output end of the drive mechanism is transmission-connected to the input end of the inter-axle differential and the input end of the second rear axle, the output end of the inter-axle differential is connected to the fourth torque machine, and the inter-axle differential is provided with an inter-axle differential lock.

[0010] In the above-mentioned drive axle test system, when the inter-axle differential is in a locked state, the drive mechanism can drive the input end of the second rear axle to move, and the second rear axle can drive the first rear axle connected thereto to move simultaneously, so that the first output end and the second output end of the second rear axle and the input end, the first output end and the second output end of the first rear axle all move. After the first torque machine, the second torque machine and the third torque machine respectively apply torque to the input end of the first rear axle, the first output end of the first rear axle and the second output end of the second rear axle, the test purpose of the first rear axle and the second rear axle can be achieved. ; Since the second rear axle can cooperate with the inter-axle differential to form a mid-axle structure, when the inter-axle differential is in an unlocked state, the drive mechanism can provide driving force to the inter-axle differential while the fourth torque machine can provide torque to the inter-axle differential, thereby achieving the purpose of testing the first rear axle and the mid-axle structure formed by the cooperation of the second rear axle and the inter-axle differential; in addition, since the first output end of the second rear axle is connected to the second output end of the first rear axle by a connecting member, the increased output torque of the second rear axle will be reduced by the first rear axle, making this system suitable for heavy-duty drive axles with large torque.

[0011] In one embodiment, the first rear axle includes a first bevel gear pair, a first planetary gear train, a second planetary gear train and a first inter-wheel differential, the first bevel gear pair is transmission-connected to the first torque machine, the first inter-wheel differential is transmission-connected to the first bevel gear pair, the first inter-wheel differential is provided with a first differential lock, the first planetary gear train and the second planetary gear train are respectively arranged on the two output ends of the first inter-wheel differential, the first planetary gear train is connected to the first torque machine, and the third planetary gear train is connected to the connecting member.

[0012] In the above embodiment, the first torque machine can provide torque to the first bevel gear pair, so that the first bevel gear pair can provide driving force to the first inter-wheel differential. When the first differential lock is locked, so that the first inter-wheel differential cannot perform differential speed, the first inter-wheel differential can provide driving force to the third planetary gear system, so that the third planetary gear system provides driving force to the second rear axle through the connecting member. When the first differential lock is not locked and the first inter-wheel differential can perform differential speed, the first inter-wheel differential can provide driving force to the first planetary gear system and the third planetary gear system, and the third torque machine can provide torque to the first planetary gear system, so that the first inter-wheel differential can be tested.

[0013] In one embodiment, the second rear axle includes a transmission assembly, a third planetary gear train, a fourth planetary gear train and a second inter-wheel differential. The transmission assembly is in transmission connection with the drive mechanism, the second inter-wheel differential is in transmission connection with the transmission assembly, the second inter-wheel differential is provided with a second differential lock, the third planetary gear train and the fourth planetary gear train are respectively arranged on the two output ends of the second inter-wheel differential, the third planetary gear train is connected to the connecting member, and the fourth planetary gear train is connected to the third torque machine.

[0014] In the above embodiment, the drive mechanism can provide torque to the transmission assembly, so that the transmission assembly can provide driving force to the second inter-wheel differential. When the second differential lock is locked, so that the second inter-wheel differential cannot perform differential speed, the second inter-wheel differential can provide driving force to the third planetary gear system, so that the third planetary gear system provides driving force to the first rear axle through the connecting member. When the second differential lock is unlocked and the second inter-wheel differential can perform differential speed, the second inter-wheel differential can simultaneously provide driving force to the third planetary gear system and the fourth planetary gear system, so that the third torque machine can provide torque to the fourth planetary gear system, so that the fourth planetary gear system can be tested.

[0015] In one embodiment, the transmission assembly includes a second bevel gear pair and a cylindrical gear pair, the drive mechanism is connected to the cylindrical gear pair through the inter-axle differential, the second bevel gear pair is connected to the cylindrical gear pair, the second inter-wheel differential is connected to the second bevel gear pair, and the inter-axle differential is connected to the fourth torque machine.

[0016] In the above embodiment, the inter-axle differential can be driven to move by the driving mechanism, so that the inter-axle differential provides driving force to the cylindrical gear pair, and then transmits the driving force to the second inter-wheel differential through the second bevel gear pair. When the inter-axle differential lock is not locked, the inter-axle differential can be simultaneously subjected to the driving force provided by the driving mechanism and the torque provided by the fourth torque machine, so that the inter-axle differential can be tested.

[0017] In one embodiment, the driving mechanism includes a motor and a transmission, the transmission is drivingly connected to the motor, and the output end of the transmission is drivingly connected to the inter-axle differential.

[0018] In the above embodiment, the speed of the motor can be adjusted by the transmission, thereby adjusting the driving force provided by the motor.

[0019] A drive axle test method comprises the following steps:

[0020] Transmission connecting the drive mechanism to the inter-axle differential and the second rear axle;

[0021] connecting an output end of the inter-axle differential to the fourth torque machine;

[0022] Connecting the first output end of the second rear axle to the second output end of the first rear axle via a connecting member, and connecting the second output end of the second rear axle to the third torque machine;

[0023] Connecting the first output end of the first rear axle to the second torque machine, and connecting the input end of the first rear axle to the first torque machine;

[0024] The differential between the drive shafts does not perform differential action;

[0025] The driving mechanism drives the second rear axle to move, so that the second rear axle drives the first rear axle to move;

[0026] driving the first torque machine, the second torque machine, and the third torque machine to respectively provide torque to the input end of the first rear axle, the first output end of the first rear axle, and the second output end of the second rear axle, so that the input end, the first output end, and the second output end of the second rear axle, as well as the input end, the first output end, and the second output end of the first rear axle, all move;

[0027] The number of fatigue endurance tests or the time when the first rear axle and the second rear axle fail is recorded to determine the fatigue life of the first rear axle and the second rear axle, thereby determining whether the first rear axle and the second rear axle meet the design requirements.

[0028] In the above-mentioned drive axle test method, when the inter-axle differential is in a locked state, the drive mechanism can drive the input end of the second rear axle to move, and make the second rear axle drive the first rear axle connected thereto to move at the same time, so that the first output end and the second output end of the second rear axle and the input end, the first output end and the second output end of the first rear axle all move, and after the first torque machine, the second torque machine and the third torque machine respectively give torque to the input end of the first rear axle, the first output end of the first rear axle and the second output end of the second rear axle, the test purpose of the first rear axle and the second rear axle can be achieved; in addition, since the first output end of the second rear axle is connected to the second output end of the first rear axle, the increased output torque of the second rear axle will be reduced by the first rear axle, thereby making this system suitable for heavy-duty drive axles with large torque.

[0029] In one embodiment, after connecting the input end of the first rear axle to the first torque machine, the method further includes:

[0030] The differential between the drive shafts performs differential action;

[0031] The driving mechanism drives the inter-axle differential and the second rear axle to move, so that the second rear axle drives the first rear axle to move;

[0032] driving the first torque machine, the second torque machine, the third torque machine, and the fourth torque machine to respectively provide torque to the input end of the first rear axle, the first output end of the first rear axle, the second output end of the second rear axle, and the inter-axle differential, so that the inter-axle differential and the input end, the first output end, and the second output end of the second rear axle, as well as the input end, the first output end, and the second output end of the first rear axle all move;

[0033] The number of fatigue tests or the time taken for failure of the inter-axle differential, the first rear axle and the second rear axle are recorded to determine the fatigue life of the inter-axle differential, the first rear axle and the second rear axle, thereby determining whether the first rear axle and the middle axle structure formed by the second rear axle and the inter-axle differential meet the design requirements.

[0034] In the above embodiment, since the second rear axle can cooperate with the inter-axle differential to form a mid-axle structure, when the inter-axle differential is in an unlocked state, the drive mechanism can provide driving force to the inter-axle differential while the fourth torque machine can provide torque to the inter-axle differential, thereby achieving the purpose of testing the first rear axle and the mid-axle structure formed by the cooperation of the second rear axle and the inter-axle differential.

[0035] In one embodiment, after connecting the input end of the first rear axle to the first torque machine, the method further includes:

[0036] The first inter-wheel differential driving the first rear axle does not perform differential action;

[0037] The second inter-wheel differential of the second rear axle is driven to perform differential action;

[0038] The differential between the drive shafts does not perform differential action;

[0039] The driving mechanism drives the second inter-wheel differential of the second rear axle to move;

[0040] driving the third torque machine to provide torque to the second output end of the second rear axle, the second output end of the second rear axle being drivingly connected to the second inter-wheel differential of the second rear axle, so that the second output end of the second rear axle provides torque to the second inter-wheel differential;

[0041] The fatigue life of the second inter-wheel differential is determined by recording the number of fatigue tests or the time when the second inter-wheel differential fails, thereby determining whether the second inter-wheel differential meets the design requirements.

[0042] In the above embodiment, since the second output end of the second rear axle is cooperatively connected to the second inter-wheel differential, when the second inter-wheel differential is in a state capable of performing differential action, a driving force is applied to the second inter-wheel differential through the driving mechanism, and when the third torque machine applies torque to the second inter-wheel differential through the second output end of the second rear axle, the performance of the second inter-wheel differential can be verified.

[0043] In one embodiment, after connecting the input end of the first rear axle to the first torque machine, the method further includes:

[0044] driving a first inter-wheel differential of the first rear axle to perform differential action;

[0045] The second inter-wheel differential driving the second rear axle does not perform differential action;

[0046] The differential between the drive shafts does not perform differential action;

[0047] The driving mechanism drives the second rear axle to move, so that the second rear axle drives the first inter-wheel differential of the first rear axle to move;

[0048] driving the first torque machine to provide torque to the input end of the first rear axle, wherein the input end of the first rear axle is drivingly connected to the first inter-wheel differential of the first rear axle, so that the input end of the first rear axle moves;

[0049] The fatigue life of the first inter-wheel differential is determined by recording the number of fatigue tests or the time when the first inter-wheel differential fails, thereby determining whether the first inter-wheel differential meets the design requirements.

[0050] In the above embodiment, since the input end of the first rear axle is cooperatively connected to the first inter-wheel differential, when the first inter-wheel differential is in a state capable of performing differential action, the driving mechanism provides driving force to the first inter-wheel differential, and the first torque machine provides torque to the first inter-wheel differential through the input end of the first rear axle, the performance of the first inter-wheel differential can be verified.

[0051] In one embodiment, after connecting the input end of the first rear axle to the first torque machine, the method further includes:

[0052] The first inter-wheel differential driving the first rear axle does not perform differential action;

[0053] The second inter-wheel differential driving the second rear axle does not perform differential action;

[0054] The differential between the drive shafts performs differential action;

[0055] The driving mechanism drives the input end of the inter-axle differential to move;

[0056] driving the fourth torque machine to impart torque to an output end of the inter-axle differential, causing the output end of the inter-axle differential to move;

[0057] The fatigue life of the inter-axle differential is determined by recording the number of fatigue tests or the time when the inter-axle differential fails, thereby determining whether the inter-axle differential meets the design requirements.

[0058] In the above embodiment, since the input end of the inter-axle differential is cooperatively connected with the output end of the inter-axle differential, when the inter-axle differential is in a state capable of performing differential action, the performance of the inter-axle differential can be verified when torque is simultaneously applied to the inter-axle differential by the drive mechanism and the fourth torque machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] Figure 1 This is a schematic structural diagram of a drive axle test system according to some embodiments of the present application;

[0060] Figure 2 for Figure 1 Structural schematic diagram of the first rear axle in FIG;

[0061] Figure 3 for Figure 1 Schematic diagram of the structure between the second rear axle and the inter-axle differential.

[0062] Reference numerals:

[0063] 1. First rear axle;

[0064] 11. First bevel gear pair; 12. First planetary gear train; 13. Second planetary gear train; 14. First inter-gear differential;

[0065] 15. First differential lock;

[0066] 2. Second rear axle;

[0067] 21. Second bevel gear pair; 22. Cylindrical gear pair; 23. Third planetary gear train; 24. Fourth planetary gear train; 25. Second inter-gear differential;

[0068] 26. Second differential lock;

[0069] 3. Driving mechanism;

[0070] 4. First torque machine;

[0071] 5. Second torque machine;

[0072] 6. Third torque machine;

[0073] 7. Fourth torque machine;

[0074] 8. Connectors;

[0075] 9. Inter-axle differential;

[0076] 91. Inter-axle differential lock. DETAILED DESCRIPTION

[0077] To make the above-mentioned objects, features, and advantages of the present invention more readily apparent, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. The following description sets forth numerous specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0078] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0079] Furthermore, the terms "first" and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "third" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0080] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0081] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a third feature may mean that the first and third features are in direct contact, or that the first and third features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above," "above," or "above" a third feature may mean that the first feature is directly above or diagonally above the third feature, or simply means that the first feature is at a higher level than the third feature. A first feature being "below," "below," or "below" a third feature may mean that the first feature is directly below or diagonally below the third feature, or simply means that the first feature is at a lower level than the third feature.

[0082] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0083] See Figure 1-Figure 3 One embodiment of the present invention provides a drive axle test system comprising a first rear axle 1, a second rear axle 2, and a drive mechanism 3. The rear axle, also known as the rear drive axle, refers to the rear drive shaft component of a vehicle that transmits power. Drive mechanism 3 is used to provide driving force for the rear axle. The drive axle structure combining a rear axle and a mid-axle can refer to the structure of the HW1279 drive axle.

[0084] The first rear axle 1 has an input end connected to a first torque machine 4, and a first output end connected to a second torque machine 5. Specifically, the first rear axle 1 has a first output end and a second output end, and the input end, the first output end, and the second output end are meshed with each other via a gear structure. This gear structure can be consistent with the structure of an inter-wheel differential. When the first torque machine 4 applies torque to the input end of the first rear axle 1, the first rear axle 1 can transmit this torque to its first and second output ends via the gear structure. When the second torque machine 5 applies torque to the first output end of the first rear axle 1 simultaneously, the first and second output ends of the first rear axle 1 can perform differential motion.

[0085] The second rear axle 2 has a first output end connected to the second output end of the first rear axle 1 via a connector 8, and the second output end of the second rear axle 2 is connected to the third torque machine 6. Specifically, the second rear axle 2 has a first output end and a second output end, and its input end, first output end, and second output end are meshed with each other via a gear structure. This gear structure can be consistent with the structure of an inter-wheel differential. When the third torque machine 6 applies torque to the second output end of the second rear axle 2, its second output end can rotate accordingly. The first output end of the second rear axle 2 is coaxially connected to the second output end of the first rear axle 1 via a connecting flange. When the first output end of the second rear axle 2 is subjected to torque, the torque can be transmitted to the first rear axle 1 via the connecting flange.

[0086] The drive mechanism 3 has an output end drivingly connected to the input of the inter-axle differential 9 and the input of the second rear axle 2. The output of the inter-axle differential 9 is connected to the fourth torque machine 7, and the inter-axle differential 9 is equipped with an inter-axle differential lock 91. Specifically, the input of the inter-axle differential 9 is drivingly connected to the output shaft of the drive mechanism 3, and the input of the second rear axle 2 is meshed with the inter-axle differential 9 via a gear structure. When the drive mechanism 3 applies driving force to the input of the inter-axle differential 9, the inter-axle differential 9 can transmit this driving force to its output end or, via the gear structure, to the input of the second rear axle 2. Due to the structural characteristics of the inter-axle differential 9, when the fourth torque machine 7 applies torque to the output of the inter-axle differential 9, this torque acts only within the inter-axle differential 9 and is not transmitted to the second rear axle 2.

[0087] In the above-mentioned drive axle test system, when the inter-axle differential 9 is in a locked state, the drive mechanism 3 can drive the input end of the second rear axle 2 to move, and the second rear axle 2 drives the first rear axle 1 connected thereto to move simultaneously, so that the first output end and the second output end of the second rear axle 2 and the input end, the first output end and the second output end of the first rear axle 1 all move. After the first torque machine 4, the second torque machine 5 and the third torque machine 6 respectively apply torque to the input end of the first rear axle 1, the first output end of the first rear axle 1 and the second output end of the second rear axle 2, the test purpose of the first rear axle 1 and the second rear axle 2 can be achieved. ; Since the second rear axle 2 can cooperate with the inter-axle differential 9 to form a mid-bridge structure, when the inter-axle differential 9 is in an unlocked state, the drive mechanism 3 can provide driving force to the inter-axle differential 9 while the fourth torque machine 7 can provide torque to the inter-axle differential 9, thereby achieving the purpose of testing the first rear axle 1 and the mid-bridge structure formed by the cooperation of the second rear axle 2 and the inter-axle differential 9; in addition, since the first output end of the second rear axle 2 is connected to the second output end of the first rear axle 1 through the connecting member 8, the increased output torque of the second rear axle 2 will be reduced by the first rear axle 1, thereby making this system suitable for heavy-duty drive axles with large torque.

[0088] In one embodiment, the first rear axle 1 includes a first bevel gear pair 11, a first planetary gear train 12, a second planetary gear train 13 and a first inter-wheel differential 14. The first bevel gear pair 11 is transmission-connected to the first torque machine 4, the first inter-wheel differential 14 is transmission-connected to the first bevel gear pair 11, the first inter-wheel differential 14 is provided with a first differential lock 15, the first planetary gear train 12 and the second planetary gear train 13 are respectively arranged on the two output ends of the first inter-wheel differential 14, the first planetary gear train 12 is connected to the first torque machine 4, and the second planetary gear train 13 is connected to the connecting member 8. Specifically, the first inter-wheel differential 14 includes a first housing, a first cross shaft, first planetary gears, and first side gears. The first cross shaft is fixed to the interior of the first housing. Four first planetary gears are provided, and the four first planetary gears are respectively mounted on the four shafts of the first cross shaft. A first differential lock 15 is provided on the first planetary gears. Two first side gears are provided, and the two first side gears are located on both sides of the first cross shaft. Both first side gears mesh with the four first planetary gears. The first planetary gear train 12 and the second planetary gear train 13 are connected to the two first side gears via the two first side shafts, respectively. The first bevel gear pair 11 meshes with the first housing, so that when the first bevel gear pair 11 drives the first housing to rotate, the first cross shaft drives the first planetary gears and the first side gears to rotate, thereby driving the first planetary gear train 12 and the second planetary gear train 13 to rotate. When the four first planetary gears all revolve with the first cross shaft, the first planetary gear train 12 and the second planetary gear train 13 rotate at the same speed; when the four first planetary gears revolve with the first cross shaft and also rotate around the first cross shaft, the first planetary gear train 12 and the second planetary gear train 13 can rotate differentially.

[0089] In the above embodiment, the first bevel gear pair 11 can be given torque by the first torque machine 4, so that the first bevel gear pair 11 can give driving force to the first inter-wheel differential 14. When the first differential lock 15 is locked, the first planetary gear cannot rotate around the first cross axis, and the first planetary gear system 12 and the second planetary gear system 13 rotate at the same speed. At this time, the first inter-wheel differential 14 cannot perform differential action. The first inter-wheel differential 14 gives driving force to the second planetary gear system 13, so that the second planetary gear system 13 gives driving force to the second rear axle 2 through the connecting member 8. When the first differential lock 15 is unlocked and the first inter-wheel differential 14 can perform differential rotation, the first inter-wheel differential 14 applies driving force to the first planetary gear system 12 and the second planetary gear system 13, and the second torque machine 5 applies torque to the first planetary gear system 12, so that the first planetary gear system 12 and the second planetary gear system 13 can perform differential rotation at this time. The first planetary gears inside the first inter-wheel differential 14 revolve with the first cross shaft while also rotating around the first cross shaft, so that the performance of the first inter-wheel differential 14 can be tested.

[0090] In one embodiment, the second rear axle 2 includes a transmission assembly, a third planetary gear train 23, a fourth planetary gear train 24 and a second inter-wheel differential 25. The transmission assembly is in transmission connection with the second inter-wheel differential 25. The second inter-wheel differential 25 is provided with a second differential lock 26. The third planetary gear train 23 and the fourth planetary gear train 24 are respectively arranged on the two output ends of the second inter-wheel differential 25. The third planetary gear train 23 is connected to the third torque machine 6, and the fourth planetary gear train 24 is connected to the connecting member 8. Specifically, the second inter-wheel differential 25 includes a second housing, a second cross shaft, second planetary gears, and second side gears. The second cross shaft is fixed inside the second housing. Four second planetary gears are provided, and the four second planetary gears are respectively mounted on the four shafts of the second cross shaft. A second differential lock 26 is provided on the second planetary gears. Two second side gears are provided, and the two second side gears are located on both sides of the second cross shaft. Both second side gears mesh with the four second planetary gears. The third planetary gear train 23 and the fourth planetary gear train 24 are connected to the two second side gears via the two second side shafts, respectively. The transmission assembly is in transmission connection with the drive mechanism 3 and meshes with the second housing. When the transmission assembly drives the second housing to rotate, the second cross shaft drives the second planetary gears and the second side gears to rotate, thereby driving the third planetary gear train 23 and the fourth planetary gear train 24 to rotate. When the four second planetary gears all revolve with the second cross shaft, the third planetary gear train 23 and the fourth planetary gear train 24 rotate at the same speed; when the four second planetary gears revolve with the second cross shaft while also rotating around the second cross shaft, the third planetary gear train 23 and the fourth planetary gear train 24 can rotate differentially.

[0091] In the above embodiment, the drive mechanism 3 can provide torque to the transmission assembly, so that the transmission assembly can provide driving force to the second inter-wheel differential 25. When the second differential lock 26 is locked, the second planetary gear cannot rotate about the second cross axis, and the third planetary gear system 23 and the fourth planetary gear system 24 rotate at the same speed. At this time, the second inter-wheel differential 25 cannot perform differential action. The second inter-wheel differential 25 provides driving force to the fourth planetary gear system 24, so that the fourth planetary gear system 24 can provide driving force to the second rear axle 2 through the connecting member 8. When the third differential lock is unlocked and the second inter-wheel differential 25 can perform differential action, the second inter-wheel differential 25 applies driving force to the third planetary gear system 23 and the fourth planetary gear system 24, and the third torque machine 6 applies torque to the third planetary gear system 23, so that the third planetary gear system 23 and the fourth planetary gear system 24 perform differential rotation at this time. The third planetary gear inside the second inter-wheel differential 25 revolves with the third cross shaft while also rotating around the third cross shaft, so that the performance of the second inter-wheel differential 25 can be tested.

[0092] In one embodiment, the transmission assembly includes a second bevel gear pair 21 and a cylindrical gear pair 22. The drive mechanism 3 is in transmission connection with the cylindrical gear pair 22 via the inter-axle differential 9. The second bevel gear pair 21 is in transmission connection with the cylindrical gear pair 22. The second inter-wheel differential 25 is in transmission connection with the second bevel gear pair 21. The inter-axle differential 9 is in transmission connection with the fourth torque machine 7. Specifically, the inter-axle differential 9 is disposed on the output shaft of the drive mechanism 3. The cylindrical gear pair 22 meshes with the inter-axle differential 9. One end of the second bevel gear pair 21 is connected to the cylindrical gear pair 22, and one end of the second bevel gear pair 21 meshes with the housing of the second inter-wheel differential 25. When the drive mechanism 3 drives the inter-axle differential 9 to rotate, the cylindrical gear pair 22 rotates accordingly, causing the second bevel gear pair 21 to drive the second inter-wheel differential 25 to rotate. The inter-axle differential 9 is internally equipped with a planetary carrier, which is equipped with a third cross shaft. Third planetary gears are mounted on each of the four shafts of the third cross shaft. Each of the third planetary gears meshes with two third side gears on either side. The drive mechanism 3 is in driving connection with one of the third side gears, while the fourth torque machine 7 is in driving connection with the other third side gear via a through shaft. When the inter-axle differential 9 is driven solely by the drive mechanism 3, the planetary carrier rotates the third cross shaft, and the four third planetary gears orbit only with the planetary carrier, not around the third cross shaft. When the drive mechanism 3 and the fourth torque machine 7 simultaneously drive the inter-axle differential 9, the four third planetary gears orbit with the third cross shaft while also rotating around it. The performance of the inter-axle differential 9 can then be tested.

[0093] In the above embodiment, the inter-axle differential 9 can be driven to move by the drive mechanism 3, so that the inter-axle differential 9 provides driving force to the cylindrical gear pair 22, and then transmits the driving force to the second inter-wheel differential 25 through the second bevel gear pair 21. When the inter-axle differential 9 is simultaneously subjected to the driving force provided by the drive mechanism 3 and the torque provided by the fourth torque machine 7, the third planetary gear in the inter-axle differential 9 revolves with the third cross shaft while also rotating around the third cross shaft, so that the inter-axle differential 9 can be tested.

[0094] In one embodiment, the drive mechanism 3 includes a motor and a transmission, the transmission is in driving connection with the motor, and the output end of the transmission is in driving connection with the inter-axle differential 9. Specifically, the motor shaft of the motor is connected to the input shaft of the transmission, and the output shaft of the transmission is connected to the third side gear of the inter-axle differential 9.

[0095] In the above embodiment, the speed of the motor can be adjusted by the transmission, thereby adjusting the driving force provided by the motor.

[0096] A drive axle test method comprises the following steps:

[0097] The drive mechanism 3 is connected to the inter-axle differential 9 and the second rear axle 2 in a transmission manner.

[0098] In this embodiment, the second rear axle 2 includes a second bevel gear pair 21, a cylindrical gear pair 22, a third planetary gear train 23, a fourth planetary gear train 24 and a second inter-wheel differential 25. The inter-axle differential 9 is arranged on the output shaft of the drive mechanism 3, the inter-axle differential 9 is transmission-connected to the fourth torque machine 7, the cylindrical gear pair 22 is meshed with the inter-axle differential 9, one end of the second bevel gear pair 21 is connected to the cylindrical gear pair 22, and the other end of the second bevel gear pair 21 is meshed with the housing of the second inter-wheel differential 25. The second inter-wheel differential 25 is provided with a second differential lock 26.

[0099] An output end of the inter-axle differential 9 is connected to the fourth torque machine 7 .

[0100] In this embodiment, a planetary carrier is provided inside the inter-axle differential 9, and a third cross shaft is provided on the planetary carrier. Third planetary gears are sleeved on the four shafts of the third cross shaft. The third planetary gears are respectively meshed with two third half-shaft gears on both sides. The drive mechanism 3 is connected to one of the third half-shaft gears, and the fourth torque machine 7 is connected to the other third half-shaft gear via a through shaft.

[0101] The first output end of the second rear axle 2 is connected to the second output end of the first rear axle 1 via a connecting member 8 , and the second output end of the second rear axle 2 is connected to the third torque machine 6 .

[0102] In this embodiment, the third planetary gear train 23 and the fourth planetary gear train 24 are respectively arranged on the two output ends of the second inter-wheel differential 25 , the third planetary gear train 23 is connected to the third torque machine 6 , and the fourth planetary gear train 24 is connected to the connecting member 8 .

[0103] The first output end of the first rear axle 1 is connected to the second torque machine 5 , and the input end of the first rear axle 1 is connected to the first torque machine 4 .

[0104] In this embodiment, the first rear axle 1 includes a first bevel gear pair 11, a first planetary gear train 12, a second planetary gear train 13 and a first inter-wheel differential 14. The first bevel gear pair 11 is transmission-connected to the first torque machine 4, the first inter-wheel differential 14 is transmission-connected to the first bevel gear pair 11, and a first differential lock 15 is provided on the first inter-wheel differential 14. The first planetary gear train 12 and the second planetary gear train 13 are respectively arranged on the two output ends of the first inter-wheel differential 14. The first planetary gear train 12 is connected to the first torque machine 4, and the second planetary gear train 13 is connected to the connecting member 8.

[0105] The inter-drive shaft differential 9 does not perform a differential operation.

[0106] In this embodiment, the inter-axle differential lock 91 is movably mounted on the third side gear. When the inter-axle differential lock 91 is inserted into the housing of the inter-axle differential 9, the inter-axle differential 9 is locked. Specifically, when the inter-axle differential lock 91 locks the inter-axle differential 9, the inter-axle differential 9 is inserted into the housing of the inter-axle differential 9, causing the third side gear and the housing of the inter-axle differential 9 to rotate synchronously. The inter-axle differential 9 becomes a rigid structure and does not function as a differential.

[0107] The driving mechanism 3 drives the second rear axle 2 to move, so that the second rear axle 2 drives the first rear axle 1 to move.

[0108] In this embodiment, the second inter-axle differential 25 includes a second housing, a second cross shaft, second planetary gears, and second side gears. The second cross shaft is fixed within the second housing. Four second planetary gears are provided, each mounted on one of the four shafts of the second cross shaft. A second differential lock 26 is provided on the second planetary gears. Two second side gears are provided, one on each side of the second cross shaft, and each meshes with the four second planetary gears. The third and fourth planetary gear trains 23 and 24 are connected to the two second side gears via the two second side shafts, respectively. When the drive mechanism 3 drives the inter-axle differential 9 to rotate, the cylindrical gear pair 22 rotates accordingly, causing the second bevel gear pair 21 to rotate the second housing. The second cross shaft drives the second planetary gears and second side gears, which in turn drives the third and fourth planetary gear trains 23 and 24, so that the fourth planetary gear train 24 provides driving force to the first rear axle 1 via the connecting member 8.

[0109] Furthermore, this step includes: driving the driving mechanism 3 to drive the second bevel gear pair 21 and the cylindrical gear pair 22 to rotate, so that the second inter-wheel differential 25 drives the third planetary gear train 23 and the fourth planetary gear train 24 to rotate, so that the fourth planetary gear train 24 drives the first rear axle 1 to move through the connecting member 8.

[0110] The first torque machine 4, the second torque machine 5 and the third torque machine 6 are driven to respectively provide torque to the input end of the first rear axle 1, the first output end of the first rear axle 1 and the second output end of the second rear axle 2, so that the input end, the first output end and the second output end of the second rear axle 2 and the input end, the first output end and the second output end of the first rear axle 1 all move.

[0111] In this embodiment, the first inter-wheel differential 14 includes a first housing, a first cross shaft, a first planetary gear and a first side shaft gear. The first cross shaft is fixed inside the first housing. There are four first planetary gears, and the four first planetary gears are respectively mounted on the four shafts of the first cross shaft. The first differential lock 15 is arranged on the first planetary gear. There are two first side shaft gears, and the two first side shaft gears are respectively located on both sides of the first cross shaft, and the two first side shaft gears are both engaged with the four first planetary gears. The first planetary gear train 12 and the second planetary gear train 13 are respectively connected to the two first side shaft gears through the two first side shafts.

[0112] Furthermore, this step includes: driving the first torque machine 4, the second torque machine 5 and the third torque machine 6 to respectively give torque to the first bevel gear pair 11, the first planetary gear train 12 and the fourth planetary gear train 24, and in cooperation with the driving mechanism 3, the first bevel gear pair 11, the first planetary gear train 12, the second planetary gear train 13, the third planetary gear train 23 and the fourth planetary gear train 24 all move.

[0113] The number of fatigue resistance times or time when the first rear axle 1 and the second rear axle 2 fail is recorded to determine the fatigue life of the first rear axle 1 and the second rear axle 2, thereby determining whether the first rear axle 1 and the second rear axle 2 meet the design requirements.

[0114] In the above-mentioned drive axle test method, when the inter-axle differential 9 is in a locked state, the drive mechanism 3 can drive the input end of the second rear axle 2 to move, and the second rear axle 2 drives the first rear axle 1 connected thereto to move at the same time, so that the first output end and the second output end of the second rear axle 2 and the input end, the first output end and the second output end of the first rear axle 1 all move. After the first torque machine 4, the second torque machine 5 and the third torque machine 6 respectively give torque to the input end of the first rear axle 1, the first output end of the first rear axle 1 and the second output end of the second rear axle 2, the test purpose of the first rear axle 1 and the second rear axle 2 can be achieved; in addition, since the first output end of the second rear axle 2 is connected to the second output end of the first rear axle 1, the increased output torque of the second rear axle 2 will be reduced by the first rear axle 1, so that this system is suitable for heavy-duty drive axles with large torque.

[0115] In one embodiment, after connecting the input end of the first rear axle 1 to the first torque machine 4, the method further includes:

[0116] The inter-drive shaft differential 9 performs a differential operation.

[0117] In this embodiment, when the inter-axle differential lock 91 does not lock the inter-axle differential 9, the inter-axle differential lock 91 is separated from the housing of the inter-axle differential 9, the third half-axle gear and the housing of the inter-axle differential 9 can rotate differentially, and the inter-axle differential 9 plays a differential role.

[0118] The driving mechanism 3 drives the inter-axle differential 9 and the second rear axle 2 to move, so that the second rear axle 2 drives the first rear axle 1 to move.

[0119] In this embodiment, the cylindrical gear pair 22 is engaged with the inter-axle differential 9. When the inter-axle differential 9 is driven to move by the drive mechanism 3, the inter-axle differential 9 can provide driving force to the cylindrical gear pair 22, and then transmit the driving force to the second inter-wheel differential 25 through the second bevel gear pair 21. When the inter-axle differential 9 is simultaneously subjected to the driving force provided by the drive mechanism 3 and the torque provided by the fourth torque machine 7, the third planetary gear in the inter-axle differential 9 revolves with the third cross shaft while also rotating around the third cross shaft, so that the inter-axle differential 9 can be tested.

[0120] In this embodiment, the first torque machine 4, the second torque machine 5, the third torque machine 6 and the fourth torque machine 7 are driven to give torque to the first bevel gear pair 11, the first planetary gear train 12, the fourth planetary gear train 24 and the inter-axle differential 9 respectively. Under the cooperation with the driving mechanism 3, the first bevel gear pair 11, the first planetary gear train 12, the second planetary gear train 13, the third planetary gear train 23, the fourth planetary gear train 24 and the inter-axle differential 9 are all moved.

[0121] The number of fatigue resistance times or time when the inter-axle differential 9, the first rear axle 1 and the second rear axle 2 fail is recorded to determine the fatigue life of the inter-axle differential 9, the first rear axle 1 and the second rear axle 2, thereby determining whether the first rear axle 1 and the middle axle structure formed by the second rear axle 2 and the inter-axle differential 9 meet the design requirements.

[0122] In the above embodiment, since the second rear axle 2 can cooperate with the inter-axle differential 9 to form a mid-axle structure, when the inter-axle differential 9 is in an unlocked state, the drive mechanism 3 can provide driving force to the inter-axle differential 9 while the fourth torque machine 7 can provide torque to the inter-axle differential 9, thereby achieving the purpose of testing the first rear axle 1 and the mid-axle structure formed by the second rear axle 2 and the inter-axle differential 9.

[0123] In one embodiment, after connecting the input end of the first rear axle 1 to the first torque machine 4, the method further includes:

[0124] The first inter-wheel differential 14 driving the first rear axle 1 does not perform a differential operation.

[0125] In this embodiment, when the first differential lock 15 locks the first inter-wheel differential 14, the first planetary gear is fixed and cannot rotate around the first cross axis. At this time, the first planetary gear system 12 and the second planetary gear system 13 can only rotate at the same speed.

[0126] The second inter-wheel differential 25 driving the second rear axle 2 performs a differential operation.

[0127] In this embodiment, when the second differential lock 26 does not lock the second inter-wheel differential 25, the second planetary gear can rotate around the second cross axis, and the third planetary gear system 23 and the fourth planetary gear system 24 can rotate differentially.

[0128] The inter-drive shaft differential 9 does not perform a differential operation.

[0129] In this embodiment, when the inter-axle differential lock 91 locks the inter-axle differential 9, the inter-axle differential lock 91 is inserted into the housing of the inter-axle differential 9, the third half-axle gear rotates synchronously with the housing of the inter-axle differential 9, and the inter-axle differential 9 becomes a rigid body and does not perform a differential function.

[0130] The driving mechanism 3 drives the second inter-wheel differential 25 of the second rear axle 2 to move.

[0131] In this embodiment, the driving mechanism 3 can enable the second inter-wheel differential 25 to drive the third planetary gear train 23 and the fourth planetary gear train 24 to rotate.

[0132] The third torque machine 6 is driven to provide torque to the second output end of the second rear axle 2 , and the second output end of the second rear axle 2 is transmission-connected to the second inter-wheel differential 25 of the second rear axle 2 , so that the second output end of the second rear axle 2 provides torque to the second inter-wheel differential 25 .

[0133] In this embodiment, the third torque machine 6 is driven to rotate the fourth planetary gear train 24 , so that the third planetary gear train 23 and the fourth planetary gear train 24 rotate at a differential speed, and the second inter-wheel differential 25 can be detected.

[0134] The fatigue life of the second inter-wheel differential 25 is determined by recording the number of fatigue resistance times or the time when the second inter-wheel differential 25 fails, thereby determining whether the second inter-wheel differential 25 meets the design requirements.

[0135] In the above embodiment, since the second output end of the second rear axle 2 is cooperatively connected to the second inter-wheel differential 25, when the second inter-wheel differential 25 is in a state where differential action can be performed, the driving mechanism 3 provides driving force to the second inter-wheel differential 25, and the third torque machine 6 provides torque to the second inter-wheel differential 25 through the second output end of the second rear axle 2, the performance of the second inter-wheel differential 25 can be verified.

[0136] In one embodiment, after connecting the input end of the first rear axle 1 to the first torque machine 4, the method further includes:

[0137] The first inter-wheel differential 14 driving the first rear axle 1 performs a differential operation.

[0138] In this embodiment, when the first differential lock 15 does not lock the first inter-wheel differential 14 , the first planetary gear can rotate about the first cross shaft, and the first planetary gear train 12 and the second planetary gear train 13 can perform differential rotation.

[0139] The second inter-wheel differential 25 driving the second rear axle 2 does not perform a differential operation.

[0140] In this embodiment, when the second differential lock 26 locks the second inter-wheel differential 25, the second planetary gear is fixed and cannot rotate around the second cross axis, and the third planetary gear system 23 and the fourth planetary gear system 24 can only rotate at the same speed.

[0141] The inter-drive shaft differential 9 does not perform a differential operation.

[0142] In this embodiment, when the inter-axle differential lock 91 locks the inter-axle differential 9, the inter-axle differential lock 91 is inserted into the housing of the inter-axle differential 9, the third half-axle gear rotates synchronously with the housing of the inter-axle differential 9, and the inter-axle differential 9 becomes a rigid body and does not perform a differential function.

[0143] The driving mechanism 3 drives the second rear axle 2 to move, so that the second rear axle 2 drives the first inter-wheel differential 14 of the first rear axle 1 to move.

[0144] In this embodiment, the driving mechanism 3 can enable the second inter-wheel differential 25 to drive the third planetary gear train 23 and the fourth planetary gear train 24 to rotate, and enable the third planetary gear train 23 to drive the second inter-wheel differential 25 to move, so that the first planetary gear train 12 and the second planetary gear train 13 are rotated.

[0145] The first torque machine 4 is driven to provide torque to the input end of the first rear axle 1 , and the input end of the first rear axle 1 is drivingly connected to the first inter-wheel differential 14 of the first rear axle 1 , so that the input end of the first rear axle 1 moves.

[0146] In this embodiment, the first torque machine 4 is driven to rotate the first planetary gear train 12 , so that the first planetary gear train 12 and the second planetary gear train 13 rotate at a differential speed, and the first inter-gear differential 14 can be detected.

[0147] The fatigue life of the first inter-wheel differential 14 is determined by recording the number of fatigue resistance times or the time when the first inter-wheel differential 14 fails, thereby determining whether the first inter-wheel differential 14 meets the design requirements.

[0148] In the above embodiment, since the input end of the first rear axle 1 is cooperatively connected to the first inter-wheel differential 14, when the first inter-wheel differential 14 is in a state capable of performing differential action, the driving mechanism 3 provides driving force to the first inter-wheel differential 14, and the first torque machine 4 provides torque to the first inter-wheel differential 14 through the input end of the first rear axle 1, the performance of the first inter-wheel differential 14 can be verified.

[0149] In one embodiment, after connecting the input end of the first rear axle 1 to the first torque machine 4, the method further includes:

[0150] The first inter-wheel differential 14 driving the first rear axle 1 does not perform a differential operation.

[0151] In this embodiment, when the first differential lock 15 locks the first inter-wheel differential 14, the first planetary gear is fixed and cannot rotate around the first cross axis. At this time, the first planetary gear system 12 and the second planetary gear system 13 can only rotate at the same speed.

[0152] The second inter-wheel differential 25 driving the second rear axle 2 does not perform a differential operation.

[0153] In this embodiment, when the second differential lock 26 locks the second inter-wheel differential 25, the second planetary gear is fixed and cannot rotate around the second cross axis, and the third planetary gear system 23 and the third planetary gear system 23 can only rotate at the same speed.

[0154] The inter-drive shaft differential 9 performs a differential operation.

[0155] In this embodiment, when the inter-axle differential lock 91 does not lock the inter-axle differential 9, the inter-axle differential lock 91 is separated from the housing of the inter-axle differential 9, the third half-axle gear and the housing of the inter-axle differential 9 can rotate differentially, and the inter-axle differential 9 plays a differential role.

[0156] The driving mechanism 3 drives the input end of the inter-axle differential 9 to move.

[0157] In this embodiment, the driving mechanism 3 can drive the housing of the inter-axle differential 9 and the third side gear thereof to rotate.

[0158] The fourth torque machine 7 is driven to provide torque to the output end of the inter-axle differential 9, so that the output end of the inter-axle differential 9 moves.

[0159] In this embodiment, the fourth torque machine 7 is driven to rotate one of the third side gears, and the driving mechanism 3 is driven to rotate the other third side gear, so that the two third side gears can rotate differentially, so that the inter-axle differential 9 can be detected.

[0160] The fatigue life of the inter-axle differential 9 is determined by recording the number of fatigue resistance times or the time when the inter-axle differential 9 fails, thereby determining whether the inter-axle differential 9 meets the design requirements.

[0161] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0162] The above embodiments merely illustrate several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. A drive axle test system, characterized in that: include: A first rear axle (1), wherein an input end of the first rear axle (1) is connected to a first torque machine (4), and a first output end of the first rear axle (1) is connected to a second torque machine (5); a second rear axle (2), wherein a first output end of the second rear axle (2) is connected to a second output end of the first rear axle (1) via a connecting member (8), and the second output end of the second rear axle (2) is connected to a third torque machine (6); A drive mechanism (3), wherein the output end of the drive mechanism (3) is transmission-connected to the input end of an inter-axle differential (9) and the input end of the second rear axle (2), the output end of the inter-axle differential (9) is connected to a fourth torque machine (7), and the inter-axle differential (9) is provided with an inter-axle differential lock (91).

2. The drive axle test system according to claim 1, characterized in that: The first rear axle (1) comprises a first bevel gear pair (11), a first planetary gear train (12), a second planetary gear train (13) and a first inter-wheel differential (14); the first bevel gear pair (11) is transmission-connected to the first torque machine (4); the first inter-wheel differential (14) is transmission-connected to the first bevel gear pair (11); a first differential lock (15) is provided on the first inter-wheel differential (14); the first planetary gear train (12) and the second planetary gear train (13) are respectively arranged on two output ends of the first inter-wheel differential (14); the first planetary gear train (12) is connected to the first torque machine (4); and the second planetary gear train (13) is connected to the connecting member (8).

3. The drive axle test system according to claim 1, characterized in that: The second rear axle (2) comprises a transmission assembly, a third planetary gear train (23), a fourth planetary gear train (24) and a second inter-wheel differential (25); the transmission assembly is in transmission connection with the drive mechanism (3); the second inter-wheel differential (25) is in transmission connection with the transmission assembly; a second differential lock (26) is provided on the second inter-wheel differential (25); the third planetary gear train (23) and the fourth planetary gear train (24) are respectively arranged on two output ends of the second inter-wheel differential (25); the third planetary gear train (23) is connected to the connecting member (8); and the fourth planetary gear train (24) is connected to the third torque machine (6).

4. The drive axle test system according to claim 3, characterized in that: The transmission assembly comprises a second bevel gear pair (21) and a cylindrical gear pair (22); the drive mechanism (3) is transmission-connected to the cylindrical gear pair (22) via the inter-axle differential (9); the second bevel gear pair (21) is transmission-connected to the cylindrical gear pair (22); the second inter-wheel differential (25) is transmission-connected to the second bevel gear pair (21); and the inter-axle differential (9) is transmission-connected to the fourth torque machine (7).

5. The drive axle test system according to claim 4, characterized in that: The driving mechanism (3) comprises a motor and a transmission, the transmission is in driving connection with the motor, and the output end of the transmission is in driving connection with the inter-axle differential (9).

6. A drive axle test method, characterized in that: The following steps are involved: The drive mechanism (3) is connected to the inter-axle differential (9) and the second rear axle (2); connecting the output end of the inter-axle differential (9) to the fourth torque machine (7); Connecting the first output end of the second rear axle (2) to the second output end of the first rear axle (1) via a connecting member (8), and connecting the second output end of the second rear axle (2) to the third torque machine (6); Connecting the first output end of the first rear axle (1) to the second torque machine (5), and connecting the input end of the first rear axle (1) to the first torque machine (4); The inter-drive shaft differential (9) does not perform differential action; The driving mechanism (3) drives the second rear axle (2) to move, so that the second rear axle (2) drives the first rear axle (1) to move; The first torque machine (4), the second torque machine (5) and the third torque machine (6) are driven to respectively provide torque to the input end of the first rear axle (1), the first output end of the first rear axle (1) and the second output end of the second rear axle (2), so that the input end, the first output end and the second output end of the second rear axle (2) and the input end, the first output end and the second output end of the first rear axle (1) all move; The fatigue resistance times or times when the first rear axle (1) and the second rear axle (2) fail are recorded to determine whether the first rear axle (1) and the second rear axle (2) meet the design requirements.

7. The drive axle test method according to claim 6, characterized in that: After connecting the input end of the first rear axle (1) to the first torque machine (4), the method further includes: The inter-axle differential (9) is driven to perform differential action; The driving mechanism (3) drives the inter-axle differential (9) and the second rear axle (2) to move, so that the second rear axle (2) drives the first rear axle (1) to move; The first torque machine (4), the second torque machine (5), the third torque machine (6) and the fourth torque machine (7) are driven to respectively provide torque to the input end of the first rear axle (1), the first output end of the first rear axle (1), the second output end of the second rear axle (2) and the inter-axle differential (9), so that the inter-axle differential (9) and the input end, the first output end and the second output end of the second rear axle (2) and the input end, the first output end and the second output end of the first rear axle (1) all move; The fatigue resistance times or times when the inter-axle differential (9), the first rear axle (1) and the second rear axle (2) fail are recorded to determine whether the first rear axle (1) and the middle axle structure formed by the cooperation of the second rear axle (2) and the inter-axle differential (9) meet the design requirements.

8. The drive axle testing method according to claim 6, characterized in that: After connecting the input end of the first rear axle (1) to the first torque machine (4), the method further includes: The first inter-wheel differential (14) driving the first rear axle (1) does not perform differential action; driving a second inter-wheel differential (25) of the second rear axle (2) to perform differential action; The inter-drive shaft differential (9) does not perform differential action; The driving mechanism (3) drives the second inter-wheel differential (25) of the second rear axle (2) to move; driving the third torque machine (6) to provide torque to the second output end of the second rear axle (2); the second output end of the second rear axle (2) is connected to the second inter-wheel differential (25) of the second rear axle (2) in a transmission manner, so that the second output end of the second rear axle (2) provides torque to the second inter-wheel differential (25); The fatigue resistance times or time when the second inter-wheel differential (25) fails are recorded to determine whether the second inter-wheel differential (25) meets the design requirements.

9. The drive axle test method according to claim 6, characterized in that: After connecting the input end of the first rear axle (1) to the first torque machine (4), the method further includes: driving a first inter-wheel differential (14) of the first rear axle (1) to perform differential action; The second inter-wheel differential (25) driving the second rear axle (2) does not perform differential action; The inter-drive shaft differential (9) does not perform differential action; The driving mechanism (3) drives the second rear axle (2) to move, so that the second rear axle (2) drives the first inter-wheel differential (14) of the first rear axle (1) to move; driving the first torque machine (4) to impart torque to the input end of the first rear axle (1), the input end of the first rear axle (1) being in driving connection with the first inter-wheel differential (14) of the first rear axle (1), so that the input end of the first rear axle (1) moves; The fatigue resistance times or time when the first inter-wheel differential (14) fails are recorded to determine whether the first inter-wheel differential (14) meets the design requirements.

10. The drive axle testing method according to claim 6, characterized in that: After connecting the input end of the first rear axle (1) to the first torque machine (4), the method further includes: The first inter-wheel differential (14) driving the first rear axle (1) does not perform differential action; The second inter-wheel differential (25) driving the second rear axle (2) does not perform differential action; The inter-axle differential (9) is driven to perform differential action; The driving mechanism (3) drives the input end of the inter-axle differential (9) to move; driving the fourth torque machine (7) to impart torque to the output end of the inter-axle differential (9), causing the output end of the inter-axle differential (9) to move; The fatigue resistance times or time when the inter-axle differential (9) fails are recorded to determine whether the inter-axle differential (9) meets the design requirements.

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