Electro-hydraulic device for controlling gear selection in a servo-controlled gearbox

摘要

In an electro-hyraulic device for controlling gear selection in a motorcar servo-controlled gearbox having at least four positions for gear selection, delivery of a pressurised fluid to working chambers provided in an actuator for controlling the translation of a gearbox control shaft (2) is selectively controlled by on-off valves in response to signals coming from a control processing unit. The actuator has only two control chambers (38, 52) controlled by only two three-way on-off solenoid valves (58, 60).