A rear axle torsional fatigue unilateral random spectrum loading test tool and its test method

Abstract

The invention discloses a unilateral random spectrum loading testing tooling and testing method for rear axle torsional fatigue. The tooling comprises a combined bracket and a hydraulic cylinder, wherein a hinge clamping plate is arranged on the combined bracket and connected with rubber hinges at the two ends of a rear axle welding assembly; the hydraulic cylinder is connected with one end, where a hub shaft is mounted, of the rear welding assembly through a swing bolt; the combined bracket is connected with the other end, where the hub shaft is mounted, of the rear welding assembly through the swing bolt. The method comprises the following steps: fixing the two rubber hinges of the rear axle welding assembly on the combined bracket through the hinge clamping plate; connecting two ends, where the hub shafts are mounted, of the rear axle welding assembly with the combined bracket and the hydraulic cylinder respectively through the swing bolts; pasting a strain transducer at the middle position of the rear axle welding assembly; loading one end of the rear axle welding assembly by the hydraulic cylinder; transmitting the torsional strain signals to a data acquisition device by the strain transducer to be iteratively processed. The unilateral random spectrum loading testing tooling is simple and convenient to operate, and can reappear the road test torsion working condition well.

Description

technical field [0001] The invention relates to the technical field of fatigue tests, in particular to a rear axle torsional fatigue unilateral random spectrum loading test fixture and a test method thereof. Background technique [0002] As a simple structure and low-cost semi-independent suspension, the automobile rear axle has been widely used in small and compact cars. The rear axle is connected to the bracket through a bushing hinge, the shock absorber is used as a buffer element, and the spring is used as an elastic element to connect the rear axle with the vehicle body, and at the same time achieve the functions of shock absorption and support for the vehicle body. The torsional fatigue life index of the rear axle welding assembly is one of the most important items to verify the rear axle assembly. Its good torsional fatigue performance is not only the basis for the stability and ride comfort of the car, but also satisfies the passengers' requirements for the driving c...

AI Technical Summary

Problems solved by technology

However, for the torsional fatigue test of the rear axle assembly except for the spring tray and the shock absorber bracket, the above three test methods are more cumbersome, the test tooling is more complicated, the preparation time is longer, and the test cost is higher, which is not conducive to the spring removal of the rear axle assembly. The rapid assessment and verification of the tray and shock absorber bracket; however, the bilateral equal-amplitude torsional torsional loading test for the quick assessment of the rear axle assembly except for the spring tray and shock absorber bracket is the fastest, simplest and most direct The assessment method with the lowest cost and the lowest cost, but it cannot reflect the loading conditions of the parts in the actual road test, and it cannot reflect the fatigue characteristics of the parts under different loads

Images