Test bench and verification method for strength verification of differential assembly gear train

Abstract

The present invention discloses a test bench and verification method for verifying the strength of the gear system of a differential assembly, and belongs to the technical field of design and manufacturing of test process equipment for automobile chassis production. Provided are a test bench and verification method for verifying the strength of the gear system of a differential assembly, which can verify the static strength and bending fatigue strength of the differential planetary gears, half-shaft gears and planetary gear shafts. The test bench includes a base, a support and fixing assembly and a loading drive assembly. The support and fixing assembly is arranged on the base, and the differential assembly that needs to be verified for strength is fixed to the base via the support and fixing assembly. The verification method first fixes the differential assembly and the half-shaft to the test bench, then inputs the verification torque to the differential assembly through the actuator in cooperation with the loading force arm, and finally detects the damage condition of the differential assembly gear system to verify its strength.

Description

Technical Field

[0001] The present invention relates to a test bench, and more particularly to a test bench for verifying the strength of a differential assembly gear train, belonging to the technical field of design and manufacturing of automotive chassis production test equipment. The present invention also relates to a method for verifying the strength of a differential assembly gear train using the test bench. Background Art

[0002] The rear drive axle final drive is a critical component of the vehicle's transmission system. The differential assembly within the final drive mounts the driven gear and transmits the load input from the driven gear to the axles and vehicle via the differential housing, planetary gear shafts, planetary gears, and side gears. Furthermore, the differential assembly provides differential speed when the wheels rotate at different speeds, ensuring smooth operation. Currently, neither industry nor national standards specify testing methods or standards for differential planetary gears, side gears, and planetary shafts. Conventional gear fatigue and differential fatigue testing cannot quickly verify the static and bending fatigue strength of differential planetary gears, side gears, and planetary shafts. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a test bench for verifying the strength of a differential assembly gear system, which can verify the static strength and bending fatigue strength of differential planetary gears, side gears and planetary gear shafts, and a verification method for verifying the strength of a differential assembly gear system using the test bench.

[0004] The technical solution adopted to solve the above technical problems is: a test bench for verifying the strength of the gear train of a differential assembly, the test bench comprising a base, a supporting and fixing assembly, and a loading and driving assembly. The supporting and fixing assembly is arranged on the base, and the differential assembly to be verified for strength is fixed to the base via the supporting and fixing assembly. During the gear train strength verification process, the strength of the gear train of the differential assembly is verified by the load input by the loading and driving assembly.

[0005] Furthermore, the base is composed of a base plate, on which a position adjustment guide groove is provided, and the support and fixing assembly and the loading and driving assembly are arranged on the base plate in an adjustable manner through the position adjustment guide groove.

[0006] A preferred embodiment of the above scheme is that the supporting and fixing component includes a differential assembly supporting and fixing system and a half-shaft supporting and fixing system, the differential assembly supporting and fixing system is fixedly mounted in the middle of the base plate, the half-shaft supporting and fixing system is adjustable along the length direction at one end of the base plate through a position adjustment guide groove, the differential assembly is detachably fixed to the base plate through the differential assembly supporting and fixing system, the half-shaft at one end of the differential assembly is movably supported on the half-shaft supporting and fixing system through its bearing, and the verification torque is transmitted to the differential assembly along the half-shaft at the other end through the loading drive assembly.

[0007] Furthermore, the differential assembly support and fixing system includes a set of differential assembly fixing clamps, and the differential assembly fixing clamps are detachably fixed to the middle part of the base plate.

[0008] A preferred embodiment of the above scheme is that the half-shaft support and fixing system includes at least two groups of bearing fixing support clips, and each group of the bearing fixing support clips is arranged coaxially with the differential assembly along the length direction at one end of the base plate through a position adjustment guide groove, and the end of the half-shaft not connected to the differential assembly is movably arranged on the base plate through each group of the bearing fixing support clips at the same time.

[0009] Furthermore, the loading drive assembly includes a support fixing member group and a drive loading member group, and the drive loading member group is movably arranged on the support fixing member group. The free end of the half-shaft connected to the differential assembly from the other end is rotatably supported on the support fixing member group around its own axis through the support fixing member group, and the verification torque is transmitted from the free end of the half-shaft to the differential assembly through the drive loading member group.

[0010] A preferred embodiment of the above scheme is that the support fixing member group includes a group of drive bearing fixing clamps, the drive loading member group is arranged on the drive bearing fixing clamps, and the drive bearing fixing clamps are arranged on the other end of the base plate so that their position can be adjusted along the length direction through a position adjustment guide groove.

[0011] Furthermore, the drive loading component group includes an actuator, a load sensor, a loading arm and a mounting bracket. The load sensor is arranged on the power output end of the actuator. The loading arm and the actuator are arranged on the drive bearing fixing clamp through the mounting bracket. The verification torque output by the actuator is transmitted to the half-shaft at the other end through the mounting bracket in cooperation with the loading arm.

[0012] Furthermore, the construction method first fixes the differential assembly to the test bench through the differential assembly support and fixing system, the half-axle support and fixing system and the drive bearing fixing clamp, and then inputs the verification torque from the half-axle differential assembly at one end of the drive bearing fixing clamp through the actuator with the cooperation of the loading arm rod, and controls the input torque within the range of 0.1M to 1.2M with the cooperation of the load sensor, and finally verifies the strength of the differential assembly gear system by detecting the damage conditions of the half-axle gears, planetary gears and gear shafts of the differential assembly.

[0013] The beneficial effects of the present invention are as follows: the technical solution provided by the present application is to provide a test bench including a base, a support and fixing assembly, and a loading and driving assembly, and the support and fixing assembly is arranged on the base, and then the differential assembly to be verified for strength is fixed to the base through the support and fixing assembly. During the gear train strength verification process, the strength of the gear train of the differential assembly is verified by the load input by the loading and driving assembly. In this way, when testing the gear train of the differential assembly, the differential assembly can be first fixed to the test bench through the differential assembly support and fixing system, the half-shaft support and fixing system, and the drive bearing fixing clamp. Then, the actuator is used to input a verification torque from the half-shaft differential assembly at one end of the drive bearing fixing clamp in cooperation with the loading force arm. The input torque is controlled within the range of 0.1M to 1.2M in cooperation with the load sensor. Finally, the strength of the differential assembly gear train is verified by detecting the damage conditions of the half-shaft gears, planetary gears, and gear shafts of the differential assembly. It not only solves the technical problem in the prior art that conventional gear fatigue and differential fatigue tests cannot quickly verify the static strength and bending fatigue strength of the differential planetary gears, half-shaft gears and planetary gear shafts, but also adopts the test bench provided by the application to effectively verify the strength of the gear system of the differential assembly through testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The figure is a schematic diagram of the three-dimensional structure of the test bench for verifying the strength of the differential assembly gear system according to the present invention.

[0015] Marked in the figure are: base 1, support and fixing assembly 2, loading drive assembly 3, differential assembly 4, position adjustment guide groove 5, differential assembly support and fixing system 6, half-shaft support and fixing system 7, half-shaft 8, bearing fixing support clamp 9, support and fixing component group 10, drive loading component group 11, actuator 12, load sensor 13, loading force arm rod 14, mounting bracket 15. DETAILED DESCRIPTION

[0016] like Figure 1The present invention illustrates a test bench for verifying the strength of a differential assembly gear train, capable of verifying the static strength and bending fatigue strength of differential planetary gears, side gears, and planetary gear shafts. The test bench also includes a method for verifying the strength of a differential assembly gear train using the test bench. The test bench comprises a base 1, a support and fixture assembly 2, and a loading and driving assembly 3. The support and fixture assembly 2 is mounted on the base 1, and a differential assembly 4, to be verified, is secured to the base 1 via the support and fixture assembly 2. During the gear train strength verification process, the differential assembly 4 is tested for strength using a load inputted by the loading and driving assembly 3. The technical solution provided in the present application is to provide a test bench including a base, a support and fixing assembly, and a loading and driving assembly, and arrange the support and fixing assembly on the base, and then fix the differential assembly to be verified on the base through the support and fixing assembly. During the gear train strength verification process, the strength of the gear train of the differential assembly is verified by the load input by the loading and driving assembly. In this way, when testing the gear train of the differential assembly, the differential assembly can be first fixed to the test bench through the differential assembly support and fixing system, the half-shaft support and fixing system, and the drive bearing fixing clamp. Then, the actuator is used to input a verification torque from the half-shaft differential assembly at one end of the drive bearing fixing clamp in cooperation with the loading force arm. The input torque is controlled within the range of 0.1M to 1.2M in cooperation with the load sensor. Finally, the strength of the differential assembly gear train is verified by detecting the damage conditions of the half-shaft gears, planetary gears, and gear shafts of the differential assembly. It not only solves the technical problem in the prior art that conventional gear fatigue and differential fatigue tests cannot quickly verify the static strength and bending fatigue strength of the differential planetary gears, half-shaft gears and planetary gear shafts, but also adopts the test bench provided by the application to effectively verify the strength of the gear system of the differential assembly through testing.

[0017] In the above embodiment, based on the experience of existing process equipment and in combination with the actual situation of this application, the base 1 described in this application is composed of a base plate, on which a position adjustment guide groove 5 is provided. The support and fixing assembly 2 and the loading and driving assembly 3 are arranged on the base plate in an adjustable manner via the position adjustment guide groove 5. Accordingly, to facilitate the fixation of the differential assembly 4 and the half-shafts, while also simplifying the structure of the various components of this application, the support and fixing assembly 2 includes a differential assembly support and fixing system 6 and a half-shaft support and fixing system 7. The differential assembly support and fixing system 6 is fixed to the middle portion of the base plate, and the half-shaft support and fixing system 7 is arranged at one end of the base plate in an adjustable manner along the length direction via the position adjustment guide groove 5. The differential assembly 4 is detachably fixed to the base plate via the differential assembly support and fixing system 6. The half-shaft 8 at one end of the differential assembly is movably supported on the half-shaft support and fixing system 7 via its bearing. The verification torque is transmitted to the differential assembly 4 via the loading and driving assembly 3 along the half-shaft 8 at the other end. In this case, the differential assembly support and fixing system 6 is preferably a set of differential assembly fixing clamps, which are removably fixed to the middle portion of the base plate. The axle shaft support and fixing system 7 preferably includes at least two sets of bearing fixing and supporting clamps 9, depending on actual conditions. Each set of bearing fixing and supporting clamps 9 is arranged coaxially with the differential assembly 4 along the length direction at one end of the base plate through a position adjustment guide groove 5. The ends of the axle shafts 8 not connected to the differential assembly 4 are simultaneously and movably arranged on the base plate through each set of bearing fixing and supporting clamps 9.

[0018] Furthermore, to facilitate the application and control of the verification load, the loading drive assembly 3 described in the present application includes a support fixing component group 10 and a drive loading component group 11. The drive loading component group 11 is movably arranged on the support fixing component group 10. The free end of the half-shaft 8 connected to the differential assembly 4 from the other end is rotatably supported on the support fixing component group 10 around its own axis through the support fixing component group 10. The verification torque is transmitted from the free end of the half-shaft 8 to the differential assembly through the drive loading component group 11. In this case, the support fixing component group 10 includes a set of drive bearing fixing clamps. The drive loading component group 10 is arranged on the drive bearing fixing clamps. The drive bearing fixing clamps are arranged on the other end of the base plate so that their position can be adjusted along the length direction through the position adjustment guide groove 5. The drive loading component group 11 includes an actuator 12, a load sensor 13, a loading arm 14 and a mounting bracket 15. The load sensor 13 is arranged on the power output end of the actuator 12. The loading arm 14 and the actuator 12 are arranged on the drive bearing fixing clamp through the mounting bracket 15. The verification torque output by the actuator 12 is transmitted to the half-shaft 8 at the other end through the mounting bracket 15 with the cooperation of the loading arm 14.

[0019] In summary, the test bench provided in this application can verify the static strength and fatigue life of the half-shaft gears, planetary gears and planetary gear shafts in the differential assembly. The test bench has a simple structure and can combine different loading methods according to its own resources. The test method can effectively verify the life and strength of the half-shaft gears, planetary gears and gear shafts in the differential assembly.

[0020] It should be noted that the actuator of this application is connected to an external bracket via its rear end, thereby serving as the load input component. The corresponding differential is connected to the fixture 2 via bolts, and the bearing seat is also connected to the fixture via bolts. The specific connection method is determined by the structure of the axle shaft. Furthermore, the technical problem to be solved by this application is to conduct differential fatigue testing independently of the drive axle assembly. This method simplifies the testing method and improves efficiency, thus resolving the disadvantage of being unable to conduct testing due to damage to the handpiece during assembly testing. Specific embodiments

[0022] The present invention relates to the field of bench test methods and equipment for planetary gears, side shaft gears and planetary gear shafts in automobile differential assemblies, and in particular to a bench test device and method that can simulate the stress conditions of planetary gears, side shaft gears and planetary gear shafts in a differential assembly under differential working conditions, and quickly verify the static strength and fatigue life of planetary gears, side shaft gears and planetary gear shafts in the differential assembly under differential working conditions. The bench test device and method include a differential assembly fixing and mounting device; output assemblies at both ends of the differential, a side shaft bearing fixing device, a loading force arm, a side shaft fixing device, a fixing platform, a linear actuator and other auxiliary devices.

[0023] The differential assembly is fixed on the test bench, and the half-shafts on both sides are inserted into the differential assembly according to the installed state. One half-shaft is fixed, and torque is continuously applied to the other half-shaft until the parts in the differential assembly break, thereby verifying the static torsional strength result of the differential assembly; the torque applied to one half-shaft is 0.1M~1.2M (M is half of the output torque borne by the platform differential).

[0024] Example 1

[0025] The differential assembly is mounted in the differential assembly fixture. The vehicle's axle shaft assembly (including bearings) is connected to the differential assembly. The bearings on the axles are secured to the bearing mountings. Ensure that both axles are coaxially connected to the differential assembly. The loading arm is connected to one axle shaft, while the other axle shaft is fixed. The actuator is connected to the loading arm through the test fixture, and a load sensor measures the load during the test.

[0026] Method: Actuators apply torque to the axle gears, planetary gears, and planetary gear shafts in the axle and differential assemblies. The torque is monitored by force sensors. Ensure the actual load is between 0.1 and 1.2 m.

Claims

1. A test bench for strength verification of differential assembly gear train, characterized by: The test bench comprises a base (1), a supporting and fixing assembly (2) and a loading and driving assembly (3), wherein the supporting and fixing assembly (2) is arranged on the base (1), and the differential assembly (4) whose strength needs to be verified is fixed on the base (1) through the supporting and fixing assembly (2); during the gear train strength verification process, the differential assembly (4) verifies the strength of the gear train of the differential assembly (4) through the load input by the loading and driving assembly (3). The base (1) is composed of a base plate, on which a position adjustment guide groove (5) is provided. The support fixing assembly (2) and the loading drive assembly (3) are arranged on the base plate in an adjustable manner through the position adjustment guide groove (5). The support and fixing assembly (2) includes a differential assembly support and fixing system (6) and a half-axle support and fixing system (7), wherein the differential assembly support and fixing system (6) is fixedly mounted in the middle of the base plate, and the half-axle support and fixing system (7) is arranged at one end of the base plate in an adjustable position along the length direction through the position adjustment guide groove (5), and the differential assembly (4) is detachably fixed on the base plate through the differential assembly support and fixing system (6), and the half-axle (8) at one end of the differential assembly is movably supported on the half-axle support and fixing system (7) through its bearing, and the verification torque is transmitted to the differential assembly (4) along the half-axle (8) at the other end through the loading drive assembly (3). The loading drive assembly (3) includes a supporting and fixing component group (10) and a driving loading component group (11), wherein the driving loading component group (11) is movably arranged on the supporting and fixing component group (10), and the free end of the half shaft (8) connected to the differential assembly (4) from the other end is rotatably supported on the supporting and fixing component group (10) around its own axis through the supporting and fixing component group (10), and the verification torque is transmitted from the free end of the half shaft (8) to the differential assembly through the driving loading component group (11), and the supporting and fixing component group (10) includes a group of driving bearing fixing clips, The driving loading component group (11) includes an actuator (12), a load sensor (13), a loading arm (14) and a mounting frame (15), wherein the load sensor (13) is arranged on the power output end of the actuator (12), and the loading arm (14) and the actuator (12) are arranged on the driving bearing fixing clamp through the mounting frame (15), and the verification torque output by the actuator (12) is transmitted to the half shaft (8) at the other end through the mounting frame (15) in cooperation with the loading arm (14).

2. The test bench for verifying the strength of the differential assembly gear train according to claim 1, characterized in that: The differential assembly support and fixing system (6) includes a set of differential assembly fixing clamps, and the differential assembly fixing clamps are detachably fixed to the middle part of the base plate.

3. The test bench for verifying the strength of the differential assembly gear train according to claim 2, characterized in that: The half-shaft support fixing system (7) includes at least two groups of bearing fixing support clamps (9), and each group of the bearing fixing support clamps (9) is arranged coaxially with the differential assembly (4) along the length direction on one end of the base plate through the position adjustment guide groove (5), and the end of the half-shaft (8) not connected to the differential assembly (4) is movably arranged on the base plate through each group of the bearing fixing support clamps (9) at the same time.

4. The test bench for verifying the strength of a differential assembly gear train according to claim 1, 2 or 3, characterized in that: The driving loading component group (11) is arranged on the driving bearing fixing clamp, and the driving bearing fixing clamp is arranged on the other end of the base plate in an adjustable position along the length direction through the position adjustment guide groove (5).

5. A method for verifying the strength of a differential assembly gear train using the test bench described in claim 4, characterized in that: The verification method first fixes the differential assembly (4) to the test bench through the differential assembly support fixing system (6), the half-shaft support fixing system (7) and the drive bearing fixing clamp, and then inputs the verification torque from the half-shaft (8) at one end of the drive bearing fixing clamp to the differential assembly (4) through the actuator (12) in cooperation with the loading arm (14), and controls the input torque within the range of 0.1M to 1.2M in cooperation with the load sensor (13). Finally, the strength of the differential assembly gear system is verified by detecting the damage conditions of the half-shaft gears, planetary gears and gear shafts of the differential assembly.

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