| Nowadays, the motorist has to operate frequently to deal with the complex road condition with the increasingly heavy urban transportation and the crowed road. As one of the most frequently used mechanism and the bridge to link up the human and the vehicle, the safe reliability of the automotive electronic automatic gear shifting system has a direct impact on the safety of the vehicle and the driver.For the automotive electronic automatic shifter, it is mostly damaged because of fatigue. Thus, the fatigue resistance of the automatic shifter has been a research and development concern hotspot by enterprise. This paper, supported by an application development key project(project number cstc2013 yykf B60004) of Chongqing, takes the automated-manual transmission shifting mechanism of a high-end vehicle as the research object, studying its fatigue resistance, analyzing and predicting the fatigue life of the automatic shifter, The main task is shown below:The theoretical analysis and discussion of the fatigue resistance is firstly conducted, mainly including the analysis of the S-N curve and fatigue integral damage theory for the material, introducing emphatically linear cumulative damage hypothesis and explaining the estimating method of the fatigue life.Secondly, material PP40 and PA 30 are taken as the research objects and been conducted static tension test. According to the statics experiment parameter and the fatigue crack test, the S-N curve graph and S-N curve equation is concluded.Then, the operating mechanism of the automotive automatic shifter will be analyzed again, including its working principle, building finite element model, conducting statics analysis for the nonlinear property of the material and strain test on the automatic shifter to test and verify the validity of the simulation analysis. Finally, making fatigue analysis of the automatic shifter,predicting the fatigue life. |
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