Differential assembly fatigue test tool

Abstract

The utility model relates to the field of mechanical tools, and particularly discloses a differential assembly fatigue test tool which comprises a bottom plate and two supporting plates installed on the bottom plate, and the two supporting plates are oppositely arranged on the bottom plate. Transmission shafts are connected to one sides of the two supporting plates, a differential mechanism assembly is installed between the two transmission shafts, and the ends of the transmission shafts extend into the differential mechanism assembly and are connected with half axle gears of the differential mechanism assembly; a shell of the differential assembly is fixedly connected with a connecting rod, the end of the connecting rod is hinged to a pressing rod, the end of the pressing rod is provided with a loading table, and one side of the loading table is connected with a driving piece. A supporting seat is further arranged on the bottom plate, a differential bearing is arranged on the top of the supporting seat, an outer ring of the differential bearing is installed on the supporting seat, and an inner ring of the differential bearing is arranged on the outer side of a shell of the differential assembly in a sleeving mode. According to the tool, alternating bending moment is directly applied to the differential shell through the connecting rod, the pressing rod and the loading table, and the working condition of vehicle bumping or gear impact is simulated.

Description

Technical Field

[0001] This application relates to the field of mechanical tooling, and in particular to a fatigue testing tooling for a differential assembly. Background Technology

[0002] The differential assembly is a crucial component of a vehicle's front and rear drive axles. It ensures that the left and right wheels rotate at different speeds when the vehicle is cornering, making its performance a key factor for the drive axle. To verify the performance of the differential assembly, bench testing is essential to ensure it meets the fatigue life requirements of the drive axle.

[0003] With the development of the automotive industry, car structures are becoming increasingly compact, which restricts the placement of differentials on the drive axle and constrains their dimensions. However, higher performance is required, especially for electric drive axles. Therefore, the differential assembly on the drive axle must undergo relevant bench tests before mass production to determine its achievable lifespan.

[0004] During vehicle operation, the differential must withstand alternating torque and complex impact loads. Especially when the vehicle turns or the tires slip, intense meshing forces are generated between the internal planetary gears and half-shaft gears, while the housing is subjected to cyclic bending moments due to reaction forces. Therefore, developing fatigue testing fixtures that can accurately simulate actual working conditions is crucial for verifying the durability of the differential.

[0005] Traditional fatigue testing methods have significant drawbacks: most fixtures apply torque only by rotating the input or output end, and the test results do not match the actual failure modes. Utility Model Content

[0006] The purpose of this invention is to address the shortcomings of existing technologies and provide a fatigue testing fixture for differential assemblies.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0008] A fatigue testing fixture for a differential assembly includes a base plate and two support plates mounted on the base plate, which are positioned opposite each other on the base plate.

[0009] A drive shaft is connected to one side of the two support plates. A differential assembly is installed between the two drive shafts. The end of the drive shaft extends into the differential assembly and is connected to the half-shaft gear of the differential assembly.

[0010] A connecting rod is fixedly connected to the housing of the differential assembly. A pressure rod is hinged to the end of the connecting rod. A loading platform is provided at the end of the pressure rod. A drive component is connected to one side of the loading platform.

[0011] Furthermore, a support base is provided on the base plate, and a differential bearing is provided on the top of the support base. The outer ring of the differential bearing is mounted on the support base, and the inner ring of the differential bearing is sleeved on the outside of the housing of the differential assembly.

[0012] Furthermore, the end of the drive shaft furthest from the differential assembly is fixedly connected to the support plate.

[0013] Furthermore, the connecting rod is fixedly connected to the housing of the differential assembly by bolts.

[0014] Furthermore, the driving component is a reciprocating cylinder or a hydraulic cylinder.

[0015] Furthermore, there are two support seats, which are respectively supported at both ends of the differential assembly.

[0016] Furthermore, the driving frequency of the drive component is 2Hz.

[0017] The beneficial effects of this application are as follows: the tooling accurately reproduces the real failure mode: by applying alternating bending moment directly to the differential housing through the connecting rod-pressure rod-loading table, the vehicle bump or gear impact conditions are simulated, so that the fatigue crack initiation location and propagation path of the housing and gear are highly consistent with the actual failure.

[0018] This fixture uses a combination of double support bases and differential bearings. The outer ring is fixed to the support base, and the inner ring is clamped to the housing, realizing radial zero clearance limit and axial adaptive fine adjustment of the housing to avoid vibration and uneven load. At the same time, the end of the transmission shaft is rigidly connected to the support plate to eliminate the output shaft movement. During the test, the load fluctuation amplitude was reduced by more than 60%. Attached Figure Description

[0019] Figure 1 This is a front structural diagram of this application.

[0020] Figure 2 This is a side view of this application. Detailed Implementation

[0021] Reference Figure 1 , Figure 2 A fatigue testing fixture for a differential assembly includes a base plate 1 and two support plates 2 mounted on the base plate 1, which are positioned opposite each other on the base plate 1.

[0022] A drive shaft 3 is connected to one side of each of the two support plates 2. A differential assembly 4 is installed between the two drive shafts 3. The end of the drive shaft 3 extends into the differential assembly 4 and is connected to the half-shaft gear 5 of the differential assembly 4. The end of the drive shaft 3 away from the differential assembly 4 is fixedly connected to the support plate 2.

[0023] A connecting rod 8 is fixedly connected to the housing 6 of the differential assembly 4 by bolts 7. The end of the connecting rod 8 is hinged to a pressure rod 9. The end of the pressure rod 9 is provided with a loading platform 10. One side of the loading platform 10 is connected to a drive component.

[0024] Furthermore, a support base 11 is provided on the base plate 1, and a differential bearing 12 is provided on the top of the support base 11. The outer ring of the differential bearing 12 is mounted on the support base 11, and the inner ring of the differential bearing 12 is sleeved on the outside of the housing 6 of the differential assembly 4.

[0025] In this embodiment, the driving component is a reciprocating cylinder or a hydraulic cylinder, and the driving frequency is 2Hz.

[0026] Furthermore, there are two support seats 11, which are respectively supported at both ends of the differential assembly 4.

[0027] This fixture accurately reproduces the actual failure mode: by applying alternating bending moment directly to the differential housing through connecting rod 8, pressure rod 9, and loading platform 10, it simulates vehicle bumps or gear impact conditions, making the fatigue crack initiation location and propagation path of the housing and gear highly consistent with the actual failure.

[0028] This fixture uses a combination of double support bases and differential bearings. The outer ring is fixed to the support base, and the inner ring is clamped to the housing, realizing radial zero clearance limit and axial adaptive fine adjustment of the housing to avoid vibration and uneven load. At the same time, the end of the transmission shaft is rigidly connected to the support plate to eliminate the output shaft movement. During the test, the load fluctuation amplitude was reduced by more than 60%.

[0029] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A fatigue testing fixture for a differential assembly, comprising a base plate and a support plate mounted on the base plate, characterized in that, The number of support plates is two, and the two support plates are placed opposite each other on the base plate; A drive shaft is connected to one side of each of the two support plates, and a differential assembly is installed between the two drive shafts. The end of each drive shaft extends into the differential assembly and is connected to the half-shaft gear of the differential assembly. A connecting rod is fixedly connected to the housing of the differential assembly. A pressure rod is hinged to the end of the connecting rod. A loading platform is provided at the end of the pressure rod. A drive component is connected to one side of the loading platform.

2. The differential assembly fatigue testing fixture according to claim 1, characterized in that, The base plate is also provided with a support seat, and a differential bearing is provided on the top of the support seat. The outer ring of the differential bearing is mounted on the support seat, and the inner ring of the differential bearing is sleeved on the outside of the housing of the differential assembly.

3. The fatigue testing fixture for a differential assembly according to claim 1, characterized in that, The end of the drive shaft away from the differential assembly is fixedly connected to the support plate.

4. The fatigue testing fixture for a differential assembly according to claim 1, characterized in that, The connecting rod is fixedly connected to the housing of the differential assembly by bolts.

5. The fatigue testing fixture for a differential assembly according to claim 1, characterized in that, The driving component is a reciprocating cylinder or a hydraulic cylinder.

6. The fatigue testing fixture for a differential assembly according to claim 2, characterized in that, The number of support seats is two, and the two support seats are respectively supported at both ends of the differential assembly.

7. The fatigue testing fixture for a differential assembly according to claim 1, characterized in that, The driving frequency of the drive component is 2Hz.

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