不同摩擦条件对强制连续约束型离合器工作性能的影响  

Working Performance Analysis of Positive-continuous-engagement Type Clutch in Different Friction Conditions

作　　者：严宏志[1] 杨兵[1] 胡魁贤[1] 谭援强[2] 

机构地区：[1]中南大学机电工程学院,长沙410083 [2]湘潭大学机械工程学院,湘潭411105

出　　处：《机械工程学报》2010年第17期86-92,共7页Journal of Mechanical Engineering

基　　金：中南大学研究生论文创新(2010ssxt020);湘潭大学开放课题(08-FZGJ03)资助项目

摘　　要：采用有限元和动力学分析方法,探讨强制连续约束(Positive-continuous-engagement,PCE)型离合器在不同摩擦条件下的力学特性;在Marc平台上建立由楔块和内外环组成的离合器的三维有限元模型,分析楔块与内外环的接触强度特性,得到等效Mises应力和法向应力在不同的摩擦因数下的分布曲线图及接触时的最大应力位置。采用ADAMS对该离合器进行动力学仿真,得到该离合器在不同摩擦因数下的楔合时间、楔入冲击力及稳态楔合力参数的曲线图。结果表明,若摩擦因数选得太小,接触区域变成滑动区域,离合器无法进入摩擦自动锁紧状态,在满足自锁条件下,随着摩擦因数的增大,各接触应力值变化不大,但磨损区域会变大,最大应力发生在楔块内凸轮面上。摩擦因数的变化对楔合时间影响较小,摩擦因数的增大会降低楔入冲击力,可以减少离合器低周疲劳失效,延长离合器寿命,为PCE型离合器设计及失效研究提供了重要依据。Both finite element and dynamics method are conducted to investigate the mechanical characteristics of positive-continuous-engagement（PCE） type clutch under different conditions of friction. The three-dimensional finite element analysis model of PCE-type clutch,which consists of the wedge,the inner race and the outer race,is established on the Marc platform. The contact intensity between wedges and inner-outer races are analyzed to obtain the maximum stress position and the stress distribution curve of the contact bodies. The distribution curves of distribution engagement time,impact of engagement and steady engagement force are presented through ADAMS simulation. The simulation results indicate that if the chosen friction factor is too low,the contact area will become slipping zone so that the clutch cannot be locked. The contact stress values show little change with the increase of friction coefficient under self-locking condition,but the abrasion area becomes larger and the maximum stress position is the contact area between wedges and inner race. The impact of engagement force decreases when the friction coefficient increases. Therefore,it can reduce the low cycle fatigue failure and extend the life of clutch. It will provide important basis for design and deficiency analysis of the PCE-type clutch.

关 键 词：有限元 动力学 超越离合器 接触应力 摩擦 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]