stepless transmission gearbox 基本例句 无级变速器 Applying the mechanism known as the roller-swing link cam and the rocking block mechanism,a pulsing stepless speed variator is composed, with its swing angular being adjustable.利用滚子摆动推杆凸轮机构与摆块机构，综合成摆角可调的脉动式机械无级变速器，并针对其工作原理及特性作了论述。