Method for testing key performance of drive shaft assembly of constant velocity universal joint

Abstract

The invention relates to a method for testing the key performance of a drive shaft assembly of a constant velocity universal joint in the technical field of automobile part test. The method comprises: (1) automobile steering equivalent testing: using a Hermite interpolation method to locate a critical point, judging the boundary value of neighborhood of the critical point by a cubic interpolation polynomial, thereby realizing the testing on high precision swing moment and swing angle properties; (2) equivalent testing on integrated relationship of mobile terminal universal joint displacement, swing angle and sliding force: using an inflection point subdivision sampling method and an optimal square approximation method to carry out fitting on the boundary value of the neighborhood of an inflection point by a Legendre polynomial operator, thereby realizing the testing on the integrated relationship of the displacement, the swing angle and the sliding force; and (3) power transmission stability equivalent testing: using a LOG operator to carry out precise edge localization of the boundary position,and using an optimal uniform approximation method to carry out fitting on the boundary property value in the domain of the critical point, thereby realizing the testing on assembly clearance property. In the invention, high precision automatic detection technology and algorithm are used to test multiple key performance indexes, thereby effectively reflecting the performance property of tested products.

Description

technical field [0001] The invention relates to a test method in the technical field of auto parts test, in particular to a key performance test method of a constant velocity universal joint drive shaft assembly. Background technique [0002] The constant velocity universal joint drive shaft is an important link in the automobile transmission system. It is installed between the output shaft of the gearbox and the input shaft of the main reducer of the drive axle for power transmission. Its components include: fixed end universal joint, movable end universal joint and shaft body. The quality of the key performance of the constant velocity universal joint drive shaft assembly directly affects the safety, stability and comfort of driving. In recent years, with the continuous development of my country's automobile industry, the requirements for the key performance of the constant velocity universal joint drive shaft assembly have become higher and higher, especially in terms of...

AI Technical Summary

Problems solved by technology

However, the test methods for various key performances proposed in this paper contain some unstable factors or some content does not match the actual test conditions

First, for the swing angle performance test, the test method in this paper requires the rotation angles of the fixed-end universal joint and the mobile-end universal joint to be ±30° and ±55° respectively, while the current drive shaft industry assembly product test requires The test requirements for the swing angle of the fixed-end universal joint and the mobile-end universal joint are 50° and 25°; secondly, for the test of the movement amount, moving force and swing angle of the mobile-end universal joint in this paper, a single test method is adopted , so it can only display the characteristics of a certain performance parameter, but cannot comprehensively reflect the associated changes of displacement, swing angle and sliding force during the test process. The test data has limitations, and it is difficult to fully reflect the relevant performance indicators; third, for the circumferential clearance The test method in this paper uses the handwheel to control the pendulum. This test method has obvious human errors, it is difficult to ensure the stability of the loading torque, and the repeatability of the test results is poor.

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