超越弹簧离合器的摩擦磨损特性分析

Analyzing Friction and Wear Characteristics of Overrunning Spring Clutch

超越弹簧离合器可用于高速直升机传动系统,具有简单、可靠、质轻的特点。离合器依靠弹簧和输入、输出壳体的摩擦来传递扭矩,在正向传递动力过程中要满足的自锁条件下,分析了超越弹簧离合器接触条件下的最小摩擦系数,同时研究了弹簧离合器用材料4Cr5Mo Si V钢的摩擦系数随表面粗糙度的变化规律,结果表明摩擦系数随着表面粗糙度的增加,先减小后增大,Ra存在一最佳值,在此Ra值下,摩擦系数最小;由于在反向超越过程中,磨损是超越离合器一直存在的问题,基于Archard磨损计算模型,利用组合磨损计算方法,得出了超越弹簧离合器的磨损寿命。

An overrunning spring clutch, which is simple, reliable and light, can be used for the transmission system of a high-speed helicopter. The clutch relies on the friction of the spring and the input/output shell to convey torque under the condition of self-locking with the forward transfer power, the minimum friction coefficient is analyzed under the condition of contact. The friction coefficient of 4CrSMoSiV steel was studied by changing the surface roughness; the study results show that the friction coefficient increases with the increase of surface roughness. With the optimal value of the surface roughness, the friction coefficient is minimal. The overrunning spring clutch has the wear problem. Based on the Archard wear model, the wear life of overrunning spring clutch is obtained with the composite wear calculation method.