Another system is always to utilize a variable displacement pump.  In the event the pump is configured for minimal displacement, it creates a very low quantity of oil flow, creating the hydraulic motor(s) to turn additional gradually. A CVT operates using a program of pulleys plus a belt or chain. https://gearboxcvt41738.webbuzzfeed.com/34667774/top-latest-five-gearbox-cvt-urban-news