基于弹性变形下的CVT多条分层带传动机理研究

Study of CVT Multiple Layered Belt Drive Mechanism based on Elastic Deformation

为了进一步研究无级变速器在传动过程中的机理特性,在带传动中引入传动带的弹性变形效应,同时考虑分层传动带之间和传动带与带轮间的摩擦作用,建立带传动稳态运转模型,分析系统在稳态运转过程中传动带摩擦力、张紧力和速度在带轮不同位置和不同传动比下的变化规律。研究结果表明:主动轮区域,当摩擦接触表面摩擦因数较小时,最内侧的传动带将会承担大量载荷,摩擦因数足够大时,各层传动带将会近乎分担相同的载荷,从动轮区域则相反;在主动轮区域最内层传送带传动速度最高并自内向外逐渐下降,随着传送带及带轮之间摩擦因数的增加,各层传送带的速度均增加,从动轮区域则相反;当系统固定带轮间存在一定间距,在传动比为1时传动带长度最小,随着传动比的变化,传动带长度都将呈现增加的趋势。

To further investigate the mechanism characteristic of CVT in transmission process, introduction of elastic deformation effects in the belt drive belts, and taking into account the friction be- tween the belt and layered belt and pulley, the steady--state operation of the belt drive model is established to analyze the system drive belt friction, tension and velocity variation in the steady state operation of the process at different locations and different pulley ratios under. The results show that in the capstan area, when the friction coefficient of the friction contact surface is not large enough, the inside of the belt will absorb the large load, the friction coefficient is large enough, the layers of the belt will be approximately the same load balancing, the opposite region of the driven wheels, innermost con- veyor drive speeds up and from the inside out at the driving wheel area gradually decreased with the increase of the coefficient of friction between the belt and pulley, belt speed layers increased, the area opposite the driven wheel. When the spacing between the pulley system fixed in the belt drive for the moment than the minimum length, with transmission ratio changes, the length of the belt will show an increasing trend.