强制连续约束超越离合器楔块疲劳寿命分析及楔块结构优化  

Fatigue Life Analysis and Structural Optimization of PCE Clutch Sprag

作　　者：严宏志[1] 顾俊[1] 何明生[1] 

机构地区：[1]中南大学机电工程学院,长沙410083

出　　处：《机械科学与技术》2011年第11期1965-1967,1972,共4页Mechanical Science and Technology for Aerospace Engineering

基　　金：教育部工程中心-复杂轨迹加工工艺及装备教育部工程研究中心开放课题资助

摘　　要：针对强制连续约束超越离合器楔块易产生疲劳损伤的问题,以弹性理论为基础,采用分步迭代法分析了超越离合器楔块与内外环的接触应力;在分析楔块疲劳特征的基础上,采用Manson—Coffin方程对楔块低周疲劳寿命进行了计算;以提高楔块疲劳寿命、降低楔块接触应力为目标,对楔块截面几何参数进行了优化。Fatigue damage often occurs on a PCE（positive continuous engagement） over-running clutch sprag.Based on the elasticity theory,this paper uses the step iteration method to analyze the contact stress between the clutch sprag and the inner or outer loop.The low-cycle fatigue life of the clutch sprag is calculated with the Manson-Coffin equation on the basis of analyzing its fatigue characteristics.The geometrical parameters of the clutch sprag are optimized in order to prolong its fatigue life and reduce its contact stress.This paper is helpful for the design of PCE over-running clutch and its failure analysis.

关 键 词：强制连续约束超越离合器 楔块 疲劳寿命 优化 

分 类 号：TK414.4[动力工程及工程热物理—动力机械及工程]