汽车无级自动变速器接触摩擦条件的模拟

汽车无级变速传动是一种带式摩擦传动，摩擦系数是汽车无级变速器CVT（Continuously Variable Transmission）的重要传动参数，汽车无级自动变速器油CVTF（Continuously Variable Transmission Fluid）的摩擦系数受接触状态的影响较大。CVT金属钢带与带轮之间的接触近似为锥体和柱面的接触，因接触线较短，则沿接触线长度方向的曲率变化可以略去不计，这样可以将钢带与带轮的接触问题简化为一对轴线平行的当量圆柱体的接触问题来处理。以接触应力相等为等效的接触状态，采用环块摩擦实验机模拟的方法，对汽车无级自动变速器CVT带轮和钢带的接触条件进行了模拟。

Study on Simulation of Contact Friction Condition of Continously Variable Transmission

As metal Belt CVT(Continuously Variable Trans mission) acts as a kind of friction transmission, friction coefficient is a key parameter of CVT. The friction characters of CVTF(Continuously Variable Transmission Fluid) are mainly determined by fluid and contact state. The contact between belt and pulley can be regarded as a kind of contact between cylinder and cone. As their contact line is short, the curvature change of pulley along the contact line can be neglected. Then the contact problem of belt and pulley was reasonably simplified as a contact between cylinder and cylinder. Under the state of equivalent maximum stress, the contact friction condition of metal belt and pulley was simulated by the contact of ring and block in Timken Friction Test Machine.