Electric vehicle differential torsional impact fatigue test method
An electric vehicle, impact fatigue technology, applied in vehicle testing, machine/structural component testing, instruments, etc., can solve problems such as large differences in fatigue damage, and achieve the effect of shortening the test period
Active Publication Date: 2022-02-11
重庆世纪菁华智能科技研究院有限公司
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Problems solved by technology
At present, the standards for the torsional impact fatigue test of the electric vehicle differential are still lacking, which is quite different from the fatigue damage during actual driving.
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[0050] 1) Determine the test load loading waveform
[0051] Compared with static or quasi-static loads, impact loads have the characteristics of high strength and short time consumption, so that the structure of the test piece shows local deformation and fracture under the action of stress waves.
[0052] According to the current test conditions and technical level, the possibility of completely simulating the actual impact environment in the impact test is low. Existing impact equipment can only output several typical repetitive impact processes with a certain accuracy. As the load output device of the test bench, the torque actuator can output various high-strength load waveform signals such as sine wave, triangular wave, square wave, etc., and hit the tested differential at a certain speed frequency to achieve fatigue damage. Purpose.
[0053] The optimal stress waveform is related to both time and rate in terms of mechanical properties. As far as the loading waveform ou...
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The invention discloses a torsional impact fatigue test method for an electric vehicle differential, which relates to the technical field of electric vehicles. After determining the loading waveform, a multi-working-condition torsional impact load is applied, and statistical analysis is performed on the obtained strain data of important component measuring points; The dangerous cross-section and the maximum stress were obtained through the force analysis of the inline shaft, and the loading frequency was determined in combination with the S-N curve, and the test load loading method was determined, and finally the torsional impact fatigue test method of the electric vehicle differential was obtained, and after several sets of tests , which is consistent with the actual failure form of the electric vehicle differential, which verifies the effectiveness of the test method and provides a reliable reference for the formulation of torsional impact test methods and standards for important parts of the electric vehicle power train.
Description
technical field [0001] The invention relates to the technical field of electric vehicles, in particular to a torsional impact fatigue test method for a differential gear of an electric vehicle. Background technique [0002] As environmental and energy issues become more and more serious, pure electric vehicles are the representative of new energy vehicles, and the research and development and testing of motors, electronic control systems, and mechanical transmission systems have become the focus of the industry. As the power source of electric vehicles, the motor has the advantages of quick response and stable control of output torque. However, due to the principle of electromagnetic induction and the weak damping characteristics of the electric vehicle drive train, after the command torque is given, the output torque of the motor will fluctuate up and down in the command torque value, which not only affects the smoothness of the torque, but also makes the electric vehicle ...
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IPC IPC(8): G01M13/027G01M17/007
CPCG01M13/027G01M17/007
Inventor 邹喜红李金晓袁冬梅胡秋洋席帅杰付凌锋苟林林王超蒋明聪凌龙
Owner 重庆世纪菁华智能科技研究院有限公司