Independent main reducer assembly rotation fatigue test fixture

Abstract

A rotary fatigue test fixture for an independent main reducer assembly comprises a rectangular base plate, a vertically upward mounting plate is arranged at the rear portion of the rectangular base plate, two mounting holes for fixing the reducer to be tested are arranged on the mounting plate, an open slot for making room for the reducer to be tested is arranged between the two mounting holes, an upward upright supporting column is arranged at the front portion of the rectangular base plate, bolt through holes are arranged at the four corners of the rectangular base plate, four adjustment seats for adjusting the inclination angle of the rectangular base plate are arranged at the lower end of the rectangular base plate, the upper end surfaces of the four adjustment seats are arranged as inclined planes with the same inclination angle, the lower end surfaces of the four adjustment seats are all horizontal planes, the inclined plane of each adjustment seat is provided with a first threaded hole extending downward perpendicular to the inclined plane, the rectangular base plate is fixed to the upper end of the adjustment seat by bolts, so that the rectangular base plate forms an inclined state with a higher front and a lower back, and the horizontal plane of the lower end of each adjustment seat is provided with a second threaded hole extending upward perpendicular to the horizontal plane, so that the adjustment seat can be fixed to the test bench by bolts.

Description

Technical Field

[0001] The present invention relates to the fields of testing of main reducer rotation fatigue, oil flow lubrication and the like, and in particular to a tool for testing rotation fatigue of an independent main reducer assembly. Background Art

[0002] The reducer is a key component in the drivetrain, reducing speed and increasing torque. It also redirects power output and achieves differential speed between the left and right wheels or between the center and rear axles. A vehicle must navigate a variety of driving conditions, and the components within the final reducer are in constant motion. The service life and performance of the final reducer impact the overall vehicle performance, making rotational fatigue and oil flow lubrication testing of the final reducer crucial.

[0003] Because the final drive is a critical component of the drive axle assembly, major manufacturers typically perform bench testing on the entire drive axle assembly to test its performance. During fatigue testing, the left and right axle housings of a specified length are fixed to two stakes via leaf spring mounts. The center section of the entire drive axle assembly is suspended in the air. The entire drive axle is then rotated to a specified angle by adjusting the leaf spring mounts, simulating a tilt angle and ensuring that the lubricant within the final drive is subjected to realistic operating conditions, such as oil shedding. However, the final drive extends radially from the axle housing, making it relatively large and heavy. Consequently, the drive axle assembly can only be clamped separately during testing, preventing it from forming a single unit. When vibration occurs during testing, the high torque input can cause the leaf spring mounts in the axle housing to deflect or loosen. This is particularly common during non-standard impact fatigue tests. Insecure fixation not only affects test results but can also pose safety risks. With the development of the automotive industry, the final reducer has been isolated to meet public demand for vehicle performance, especially comfort. Independent final reducers lack long axle housings on either side, relying instead on short axle shafts. This structural difference from the drive axle assembly makes traditional drive axle assembly test fixtures unsuitable for independent final reducers. Currently, no fatigue test fixture specifically designed for independent final reducers exists. Addressing these challenges requires a rotary fatigue test fixture for independent final reducer assemblies that is easy to install, safe, and efficient. Summary of the Invention

[0004] The purpose of the present invention is to provide a rotation fatigue test fixture for an independent main reducer assembly in view of the deficiencies in the prior art, so as to solve the problem that the independent main reducer has no test fixture.

[0005] The technical solution of the present invention is: a rotary fatigue test fixture for an independent main reducer assembly, comprising a rectangular base plate, a vertically upward mounting plate provided at the rear portion of the rectangular base plate, the mounting plate being provided with two mounting holes for fixing the reducer to be tested, an open slot being provided between the two mounting holes for making way for the reducer to be tested, the front of the rectangular base plate being provided with an upwardly upright supporting column, the four corners of the rectangular base plate being provided with bolt through holes, the lower end of the rectangular base plate being provided with four adjustment seats for adjusting the inclination angle of the rectangular base plate, the upper end surfaces of the four adjustment seats being provided with inclined planes with the same inclination angle, the lower end surfaces of the four adjustment seats being all horizontal planes, the inclined plane of each adjustment seat being provided with a first threaded hole extending downward perpendicular to the inclined plane, the rectangular base plate being fixed to the upper end of the adjustment seat by bolts, so that the rectangular base plate forms an inclined state with a higher front and a lower back, and the horizontal plane of the lower end of each adjustment seat being provided with a second threaded hole extending upward perpendicular to the horizontal plane, so that the adjustment seat can be fixed to the test bench by bolts.

[0006] The inclined surface of the adjustment seat has an inclination angle of α, which is 3.8° to 20°. The adjustment seat is made into various specifications with inclined surface inclination angles of 3.8° to 20°.

[0007] The four adjustment seats have the same height. Adjustment pads are set under the two adjustment seats located in the front of the rectangular base plate so that the inclined surfaces of each adjustment seat are on the same plane. The adjustment pads are provided with through holes and are installed on the test bench by bolts. The adjustment pads are made into various specifications according to the inclination angle of the inclined surface.

[0008] The number of the first threaded holes is two.

[0009] The number of the second threaded holes is two.

[0010] A front support plate is arranged between the left and right ends of the mounting plate and the front portion of the rectangular bottom plate, and a rear support plate is arranged between the left and right ends of the mounting plate and the rear portion of the rectangular bottom plate.

[0011] A third threaded hole extending downward is provided on the upper end surface of the support column.

[0012] The above technical solution is adopted: a rotary fatigue test fixture for an independent main reducer assembly, comprising a rectangular base plate, a vertically upward mounting plate provided at the rear of the rectangular base plate, two mounting holes provided on the mounting plate for fixing the reducer under test, and the two mounting holes serve as rear mounting points for the reducer under test. An open slot is provided between the two mounting holes to make way for the reducer under test, and the make way slot makes way for the rear of the reducer under test to avoid interference during the test. An upwardly upright support column is provided at the front of the rectangular base plate, and the support column serves as the mounting point for the front of the reducer under test. The reducer under test is connected to the fixture into a whole through the front and rear mounting points, and the reducer under test is firmly mounted on the test fixture for safe fatigue testing, ensuring the accuracy of the test data. At the same time, it avoids the problem of the reducer under test falling or injuring the operator due to the large torque applied during the test and the impact force generated by the gear test, thereby reducing safety hazards.

[0013] The rectangular base plate has bolt holes at its four corners. Four adjustment seats are located at the bottom of the rectangular base plate for adjusting the tilt angle of the rectangular base plate. The upper surfaces of the four adjustment seats are inclined surfaces with the same tilt angle, while the lower surfaces of the four adjustment seats are horizontal. Each adjustment seat has a first threaded hole extending downwardly and perpendicularly to the inclined surface. The rectangular base plate is secured to the upper ends of the adjustment seats with bolts, creating a tilted configuration with the front higher and the back lower. A second threaded hole extending upwardly and perpendicularly to the horizontal surface is located on the lower horizontal surface of each adjustment seat, allowing the adjustment seat to be bolted to the test bench. The inclined adjustment seats maintain the rectangular base plate in this tilted configuration. By simply swapping adjustment seats with different tilts, the reducer can simulate different tilt angles experienced by a vehicle, allowing for more tests and obtaining test data for a variety of scenarios. The threaded holes in the inclined and horizontal surfaces of the adjustment seats are used to connect the rectangular base plate to the test bench with bolts, ensuring stable placement of the rectangular base plate and a secure connection of the entire test fixture for safe testing.

[0014] The independent main reducer assembly rotation fatigue test fixture of the present invention is easy to install, safe and efficient, and can not only enrich test data but also make the results more reliable.

[0015] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the present invention;

[0017] Figure 2 It is a structural schematic diagram of the adjustment seat of the present invention;

[0018] Figure 3 This is a schematic diagram of the structure of the adjusting pad of the present invention;

[0019] Figure 4 This is a top view of the installed state of the reducer under test of the present invention;

[0020] Figure 5 This is a left view of the installed state of the reducer under test of the present invention. DETAILED DESCRIPTION

[0021] See also Figures 1 to 5 A rotary fatigue test fixture for an independent main reducer assembly comprises a rectangular base plate 1. A vertically upward mounting plate 14 is disposed at the rear of the rectangular base plate 1. Two mounting holes 142 are provided on the mounting plate 14 to secure the reducer under test. These two mounting holes 142 serve as rear mounting points for the reducer under test, securing the rear portion of the reducer. An open slot 141 is provided between the two mounting holes 142 to allow for the reducer under test, preventing interference between the mounting plate 14 and the reducer under test during installation and testing. An upwardly upright support column 6 is disposed at the front of the rectangular base plate 1. This support column 6 serves as a front mounting point for the reducer under test. A downwardly extending third threaded hole 61 is provided on the upper end surface of the support column 6 for securing the test specimen. Front support plates 12 are disposed between the left and right ends of the mounting plate 14 and the front portion of the rectangular base plate 1. A rear support plate 13 is disposed between the left and right ends of the mounting plate 14 and the rear portion of the rectangular base plate 1. The front and rear support plates abut the mounting plate 14, strengthening it and extending its service life. The rectangular base plate 1 is provided with bolt through holes 11 at the four corners, and four adjustment seats 4 for adjusting the inclination angle of the rectangular base plate 1 are provided at the lower end of the rectangular base plate 1. The upper end surfaces of the four adjustment seats 4 are provided with inclined surfaces 43 with the same inclination angle, and the inclination angle of the inclined surface 43 is α, and α is 3.8° to 20°. The lower end surfaces of the four adjustment seats 4 are all horizontal surfaces 44. The adjustment seats 4 have various specifications according to the inclination angle of 3.8° to 20° of the inclined surface 43; the four adjustment seats 4 have the same height, which is convenient for manufacturing and reduces costs. Adjustment pads 9 are provided under the two adjustment seats 4 at the front of the rectangular base plate 1, so that the inclined surfaces 43 of each adjustment seat 4 are aligned with each other. On the plane, the adjusting pad 9 is provided with a through hole, and the adjusting pad 9 is made into various specifications according to the inclination angle of the inclined surface 43; the inclined surface 43 of each adjusting seat 4 is provided with two first threaded holes 42 extending downward perpendicularly to the inclined surface, and the rectangular base plate 1 is fixed to the upper end of the adjusting seat 4 by bolts, so that the rectangular base plate 1 forms an inclined state with high front and low back, and the horizontal surface 44 at the lower end of each adjusting seat 4 is provided with two second threaded holes 41 extending upward perpendicularly to the horizontal surface, so that the adjusting seat 4 can be fixed to the test bench 8 by bolts, and the first threaded hole 42 and the second threaded hole 41 cooperate with the corresponding bolts to connect and fix the rectangular base plate 1, the adjusting seat 4, the adjusting pad 9 and the test bench.

[0022] The independent main reducer assembly rotation fatigue test fixture of this embodiment is designed with an adjustment seat 4 having an inclined surface 43 of three specifications: 3.8°, 15°, and 20°, depending on the normal angle of the reducer during flat driving, the maximum tilt angle of the reducer during climbing, and the different types of reducers being tested. The adjustment pad 9 is also manufactured with corresponding heights based on these three specifications of the adjustment seat 4. The adjustment seat 4 with a 3.8° inclined surface is used for testing during normal flat driving, the adjustment seat 4 with a 15° inclined surface is used for simulating the maximum tilt angle of an ordinary sedan reducer during climbing, and the adjustment seat 4 with a 20° inclined surface is used for simulating the maximum tilt angle of an urban off-road vehicle reducer during climbing.

[0023] The four adjustment seats 4 of this embodiment have the same height, and only one mold is needed to make one specification, which is convenient for production. If other angle tests are needed during the test, it is only necessary to replace the adjustment seat of another specification and the corresponding adjustment pad 9. Compared with the method of testing by debugging the angle in the prior art, the method of replacing the adjustment seat 4 and the adjustment pad 9 made according to the standard in this embodiment is simple to operate and has accurate angles, which is conducive to obtaining more accurate test results. Moreover, the adjustment pad 9 has a simple structure, which is conducive to reducing costs.

[0024] When installing the independent main reducer assembly rotary fatigue test fixture of this embodiment, first locate the corresponding adjustment seat 4 and adjustment pad 9 based on the reducer test to be performed. The adjustment seat 4 is bolted to the bottom of the rectangular base plate 1. The rectangular base plate 1 and adjustment pad 9 are then bolted to the test bench, and the front and rear mounting points of the reducer under test are fixed. This test fixture can complete a variety of tests on the reducer, such as oil flow lubrication tests at different angles, gear impact performance tests (non-standard), and gear fatigue tests, and has good practicality.

[0025] The independent main reducer assembly rotation fatigue test fixture of the present invention has a rectangular base plate fixedly connected to the test bench. The entire fixture is firmly fixed. The rear of the reducer to be tested is fixed by the mounting plate, and the front of the reducer to be tested is fixed by the supporting column. The reducer to be tested is easy and secure to install and safe to use. Different adjustment seats and adjustment pads are used under the rectangular base plate to realize simulation tests of various tilt angles. The operation is convenient and the test data is accurate.

[0026] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications made to the present invention by those skilled in the art without departing from the spirit of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A rotary fatigue test fixture for an independent main reducer assembly, comprising a rectangular base plate (1), characterized in that: A vertically upward mounting plate (14) is provided at the rear of the rectangular base plate (1), and two mounting holes (142) for fixing the reducer to be measured are provided on the mounting plate (14), and an open slot (141) for making way for the reducer to be measured is provided between the two mounting holes (142). An upwardly upright supporting column (6) is provided at the front of the rectangular base plate (1), and bolt through holes (11) are provided at the four corners of the rectangular base plate (1). Four adjustment seats (4) for adjusting the tilt angle of the rectangular base plate (1) are provided at the lower end of the rectangular base plate (1), and the upper end surfaces of the four adjustment seats (4) are provided as inclined surfaces (43) with the same tilt angle. The inclined surface (43) of the seat (4) has an inclination angle α, which is 3.8° to 20°. The adjustment seat (4) is made into various specifications with an inclination angle of 3.8° to 20° for simulating the working conditions of normal driving of a car, climbing of an ordinary car and climbing of an urban off-road vehicle. The lower end surfaces of the four adjustment seats (4) are all horizontal surfaces (44). The inclined surface (43) of each adjustment seat (4) is provided with a first threaded hole (42) extending downward perpendicular to the inclined surface. The rectangular bottom plate (1) is fixed to the upper end of the adjustment seat (4) by bolts, so that the rectangular bottom plate (1) forms an inclined state with a high front and a low rear. The four adjustment seats (4) have the same height and are located on the rectangular bottom plate (1). An adjusting pad (9) is provided below the two front adjusting seats (4). The height of the adjusting pad (9) is made into various specifications according to the inclination angle of the inclined surface (43) to ensure that the inclined surfaces (43) of each adjusting seat (4) are coplanar. The adjusting pad (9) is provided with a through hole and is installed on the test bench (8) by bolts. The adjusting pad (9) is made into various specifications according to the inclination angle of the inclined surface (43). A second threaded hole (41) extending upward perpendicular to the horizontal surface is provided on the horizontal surface (44) at the lower end of each adjusting seat (4), so that the adjusting seat (4) can be fixed on the test bench (8) by bolts.

2. The independent main reducer assembly rotation fatigue test fixture according to claim 1, characterized in that: The number of the first threaded holes (42) is two.

3. The independent main reducer assembly rotation fatigue test fixture according to claim 1, characterized in that: The number of the second threaded holes (41) is two.

4. The independent main reducer assembly rotation fatigue test fixture according to claim 1, characterized in that: A front support plate (12) is provided between the left and right ends of the mounting plate (14) and the front portion of the rectangular bottom plate (1), and a rear support plate (13) is provided between the left and right ends of the mounting plate (14) and the rear portion of the rectangular bottom plate (1).

5. The independent main reducer assembly rotation fatigue test fixture according to claim 1, characterized in that: The upper end surface of the support column (6) is provided with a third threaded hole (61) extending downward.

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