Vehicle shock retarding shift control mechanism - has wet-type brake and clutch and planetary gear set with reversing gear with continuously variable expanding pulley gear

摘要

The planetary gear transmission providing forward and reverse drives for vehicles comprises one wet-type brake, one wet-type clutch and a planetary gear set. It is controlled by manual selector valve and one shift control valve itself controlled by one solenoid valve operated by an electric control circuit. Hydraulic pressure supplied to the wet-type brake and the wet-type clutch is regulated in independent oil chambers respectively, with restricted feedback connections to oil chambers, resulting in effects of accurate hydraulic pressure regulation and simple structure without wrong operation. The planetary reversing gear is used in conjunction with a continuously variable expanding pulley gear.This is controlled automatically by engine speed, vehicle speed, and throttle opening.