在自动控制中,许多场合要求执行机构具有高低两种不同的速度,目前大都采用电气、液压传动,或者采用电磁离合器和机械相结合的传动。 在 C 620车床的程控化改造中,为了实现主轴速度的自动变换,设计了一种能自动变速的皮带轮机构。 自动变速皮带轮,是由行星机构和两个超越离合器 In automatic control, many occasions require the executive body has two levels of high and low speed, most of the current use of electrical and hydraulic transmission, or the use of electromagnetic clutch and mechanical transmission. In C 620 lathe program-controlled transformation, in order to achieve the automatic conversion of spindle speed, designed a automatic transmission of the pulley mechanism. Automatic gear pulleys are made up of a planetary mechanism and two overrunning clutches