CN-224231268-U - Differential mechanism assembly fatigue test frock

CN224231268UCN 224231268 UCN224231268 UCN 224231268UCN-224231268-U

Abstract

The utility model relates to the field of mechanical tools, and particularly discloses a fatigue test tool for a differential mechanism assembly, which comprises a bottom plate and two support plates arranged on the bottom plate, wherein the two support plates are opposite to each other on the bottom plate; one side of each supporting plate is connected with a transmission shaft, a differential mechanism assembly is arranged between the two transmission shafts, the end parts of the transmission shafts extend into the differential mechanism assembly and are connected with a half shaft gear of the differential mechanism assembly, a connecting rod is fixedly connected to a shell of the differential mechanism assembly, the end parts of the connecting rods are hinged with a pressing rod, a loading table is arranged at the end parts of the pressing rods, and one side of the loading table is connected with a driving piece. The bottom plate is also provided with a supporting seat, the top of the supporting seat is provided with a differential bearing, the outer ring of the differential bearing is arranged on the supporting seat, and the inner ring of the differential bearing is sleeved outside the shell of the differential assembly. The tool directly applies alternating bending moment to the differential shell through the connecting rod, the pressure lever and the loading table, and simulates the vehicle jolt or gear impact working condition.

Inventors

Flying dragon
CHEN YU
LIANG ZHENHAI
LAI XIN

Assignees

江西江铃底盘股份有限公司

Dates

Publication Date: 20260512
Application Date: 20250618

Claims (7)

1. The utility model provides a differential mechanism assembly fatigue test frock, includes the bottom plate, installs the backup pad on the bottom plate, its characterized in that, the quantity of backup pad is two, and two backup pads are in opposition each other on the bottom plate; One side of each supporting plate is connected with a transmission shaft, a differential mechanism assembly is arranged between the two transmission shafts, and the end parts of the transmission shafts extend into the differential mechanism assembly and are connected with a half shaft gear of the differential mechanism assembly; The differential mechanism assembly comprises a differential mechanism assembly body, wherein a connecting rod is fixedly connected to a shell of the differential mechanism assembly body, the end part of the connecting rod is hinged to a pressing rod, a loading table is arranged at the end part of the pressing rod, and one side of the loading table is connected with a driving piece.
2. The differential assembly fatigue test tool according to claim 1, wherein a supporting seat is further arranged on the bottom plate, a differential bearing is arranged at the top of the supporting seat, an outer ring of the differential bearing is arranged on the supporting seat, and an inner ring of the differential bearing is sleeved outside a shell of the differential assembly.
3. The differential assembly fatigue test fixture according to claim 1, wherein one end of the drive shaft away from the differential assembly is fixedly connected with the support plate.
4. The differential assembly fatigue test fixture of claim 1, wherein the connecting rod is fixedly connected with the housing of the differential assembly by a bolt.
5. The differential assembly fatigue test tooling of claim 1, wherein the driving member is a reciprocating cylinder or ram.
6. The differential assembly fatigue test fixture according to claim 2, wherein the number of the supporting seats is two, and the two supporting seats are respectively supported at two ends of the differential assembly.
7. The differential assembly fatigue test fixture of claim 1, wherein the driving member has a frequency of 2Hz.

Description

Differential mechanism assembly fatigue test frock Technical Field The application relates to the field of mechanical tools, in particular to a fatigue test tool for a differential assembly. Background The differential assembly is an important part of the front and rear drive axles of automobiles, and can ensure that left and right wheels rotate at different rotation speeds when the automobiles run on a curve, so that the performance of the differential assembly is a key element for the drive axles. To verify the performance of the differential assembly, a bench verification must be performed. Ensuring that the differential assembly meets the fatigue life requirements of the drive axle. With the development of the automobile industry, the automobile structure is more and more compact, the arrangement of the differential on the drive axle is limited, and the external dimension is restrained. However, the performance requirements are higher, in particular for electric drive axles, for which reason the differential assembly on the drive axle must be subjected to relevant bench tests before mass production, in order to understand the life that it can achieve. During the running process of the vehicle, the differential mechanism needs to bear alternating torque and complex impact load, particularly when the vehicle turns or tires skid, severe meshing force can be generated between the internal planetary gears and the side gears, and meanwhile, the shell bears periodic bending moment due to reaction force. Therefore, the development of the fatigue test tool capable of accurately simulating the actual working condition is of great importance to the verification of the durability of the differential mechanism. The traditional fatigue test method has the obvious defect that most tools only apply torque through rotating an input end or an output end, and the test result is inconsistent with the actual failure mode. Disclosure of utility model The utility model aims to overcome the defects in the prior art and provides a fatigue test tool for a differential assembly. In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows: A fatigue test tool for a differential mechanism assembly comprises a bottom plate, two support plates arranged on the bottom plate, wherein the two support plates are opposite to each other on the bottom plate; One side of the two supporting plates is connected with a transmission shaft, a differential mechanism assembly is arranged between the two transmission shafts, and the end parts of the transmission shafts extend into the differential mechanism assembly and are connected with a half shaft gear of the differential mechanism assembly; the casing of the differential mechanism assembly is fixedly connected with a connecting rod, the end part of the connecting rod is hinged with a pressing rod, the end part of the pressing rod is provided with a loading table, and one side of the loading table is connected with a driving piece. Further, the bottom plate is also provided with a supporting seat, the top of the supporting seat is provided with a differential bearing, the outer ring of the differential bearing is arranged on the supporting seat, and the inner ring of the differential bearing is sleeved outside the shell of the differential assembly. Further, one end of the transmission shaft far away from the differential assembly is fixedly connected with the supporting plate. Further, the connecting rod is fixedly connected with the housing of the differential assembly through bolts. Further, the driving piece is a reciprocating cylinder or an oil cylinder. Further, the number of the supporting seats is two, and the two supporting seats are respectively supported at two ends of the differential mechanism assembly. Further, the frequency of movement of the driving member was 2Hz. The tool has the beneficial effects that the tool accurately restores the real failure mode, namely alternating bending moment is directly applied to the differential shell through the connecting rod, the compression rod and the loading table, and the vehicle jolt or gear impact working condition is simulated, so that the fatigue crack initiation position and the propagation path of the shell and the gear are consistent with the actual failure height. The tool adopts a double-supporting seat and differential bearing combination, the outer ring is fixed on the supporting seat and the inner ring is tightly held on the shell, radial zero-clearance limiting and axial self-adaptive fine adjustment of the shell are realized, vibration unbalanced load is avoided, meanwhile, the end part of the transmission shaft is rigidly connected with the supporting plate, the movement of the output shaft is eliminated, and the load fluctuation amplitude in a test is reduced by more than 60%. Drawings Fig. 1 is a schematic diagram of the front structure of the present application. Fig. 2 is a schem