轿车变速器可靠性分析和验证

以某六速电控液力传动自动变速器为例,介绍了轿车用变速器的可靠性分析和验证方法。根据齿轮疲劳强度的应力-寿命曲线,编制了计算机辅助分析程序,得到了设计目标寿命与实际积累损伤之间可等同比较的威布尔分布的时间尺度参数。提出了客户应力数据的采集方法和威布尔分布参数生成方法。根据应力强度干涉理论,求出在可靠性目标下的齿轮强度期望特征寿命,确定了试验的目标应力、样本量和试验循环。阐述了验证试验过程中故障处理原则。

Passenger Car Transmission Reliability Analysis and Validation

This article takes a 6-speed electrically-control hydraulic automatic transmission as example to elaborate passenger car transmission reliability analysis and validation method.According to the stress-life curve of gear fatigue strength,it formulates computer-aided analysis program and obtain time dimension parameter of Weibull distribution between design target life and actual accumulated damage.The paper also proposes the collection method of customer stress data and parameter generation method of Weibull distribution.According to stress strength interference theory,gear strength expected life under reliability target is found,and test target stress,sample quantity and test cycle are determined.The principle of failure treatment is elaborated in verification test.