Automobile torsion beam back bridge fatigue test device

Abstract

The invention relates to an automobile torsion beam back bridge fatigue test device which comprises a worktable and a vertical frame. A back bridge to be tested is hinged to the vertical frame through two bushing casings. The device also comprises two electromagnetic driving components, and each of the electromagnetic driving components comprises an electromagnet and a driving steel plate. Each driving steel plate is fixed to the corresponding flange plate on the back bridge to be tested, the electromagnets at two sides can alternately apply opposite acting force to the corresponding driving steel plates, and thus the corresponding flange plates have relative displacement. The device also comprises displacement sensors arranged at two sides of the back bridge to be tested, and each of the displacement sensors is used for measuring the relative displacement of the corresponding flange plate. The structure of the automobile torsion beam back bridge fatigue test device is simple, the electromagnets are used to load a load, the back bridge fatigue test cycle can be greatly shortened, and at the same time, when the back bridge has fatigue cracking, the vibration frequency is reduced. According to the device, the displacement sensors are used to scan the vibration frequency of the back bridge, thus whether the back bridge has the fatigue cracking can be automatically judged, and the errors of artificial judgment are avoided.

Description

technical field [0001] The invention relates to the field of auto parts test devices, in particular to an automobile torsion beam type rear axle fatigue test device. Background technique [0002] The torsion beam rear axle of the automobile is hinged on the vehicle body, which can slow down the impact between the rear wheel and the ground, reduce noise, and improve the comfort and stability of the vehicle. The torsion beam rear axle of an automobile generally includes a torsion beam and trailing arms connected to both ends of the torsion beam, wherein a spring tray is fixed at the connection between each trailing arm and the torsion beam, and a bushing is fixed at one end of each trailing arm tube, and the other end is fixed with a flange plate. The Chinese utility model patent whose patent number is ZL201120271981.5 (the authorization announcement number is CN202163272 U), the Chinese invention patent whose application number is 201510132767.4 (the application publication ...

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Problems solved by technology

However, the real vehicle road test costs are high, the cycle is long, and the coordination of other resources is required; in laboratory experiments, hydraulic cylinders are often used to drive the rear axle to complete the experiment, but the loading frequency of the hydraulic cylinder in this experiment is low (usually 1Hz-2Hz), The test period is long (calculated based on 1,000,000 times of loading, the test period is about 6-12 days), and it is necessary to manually stop the machine regularly to check whether the parts are fatigue cracked. Due to personnel mistakes, the fatigue cracks of the rear axle may not be found in time. There is a large error in the experiment

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