金属V-带推块型CVT的研究(I)——传递转矩和带轮推力间关系

A Study of A Metal pushing V Belt Type CVT Part 1:Relation Between Transmitted Torque and Pulley Thrust

本文在金属V-带推块型CVT上,测出了主、从动带轮的传递转矩和推力以及两带轮间的轴向力。绘出了不同速比下主、从动带轮间相对于转矩比的推力比线图并作相互比较。发现推力比与速比几乎和带轮转速及正常转矩下的最大可传递的转矩无关,该推力比是速比的函数,它和转矩比及推块与带轮间的摩擦系数有关。还导出了带轮推力经验平衡方程式,该式以显函数形式表示。它可以简化并可适用于电控CVT。

Transmitted torque,thrusts of driving and driven pulleys,and axial force between two pulleys were measured on a metal pushing V belt type CVT.Thrust ratios between driving and driven pulleys at several different speed ratios were plotted with respect to torque ratio and compared with each other.It was found that the relation between thrust ratio and speed ratio was almost independent of rotational speed of the pulley and the maximum transmittable torque at a constant torque ratio.The thrust ratio is primarily a function of speed ratio.It also depends on torque ratio and coefficient of friction between blocks and a pulley.An empirical equation for pulley thrust balance was derived.The equation is expressed in an explicit form.It is so simple that it can be applicable for electronic control of CVT.