Patent ID: 6164182
Filing Date: 2000-12-26
Classification: F16H

Abstract:
An actuating device for automation of a manual transmission of a vehicle having a plurality of gates, said actuating device comprising:a housing having a chamber under atmospheric pressure;first and second bushings slidably supported in said housing;a first main piston supported in said first bushing and a second main piston supported in said second bushing wherein said first main piston has a first end face loaded by a hydraulic medium and a second end face remote from said first end face, and wherein said second main piston has a first end face loaded by the hydraulic medium and a second end face remote from said first end face, said second end faces of said first and second main pistons positioned in said chamber under atmospheric pressure and facing one another;a control lever, fixedly connected to an actuator shaft of the manual transmission, for selecting one of said gates of the manual transmission, said control lever positioned between said first and second main pistons;a first valve hydraulically controlling and actuating said first main piston by a hydraulic medium;a second valve hydraulically controlling and actuating said second main piston by the hydraulic medium;a first auxiliary piston cooperating with said first main piston and having end faces loaded by the hydraulic medium;a second auxiliary piston cooperating with said second main piston and having end faces loaded by the hydraulic medium, wherein a surface area of each one of said end faces of said first auxiliary piston is smaller than a surface area of said first end face of said first main piston and wherein a surface area of each one of said end faces of said second auxiliary piston is smaller than a surface area of said first end face of said second main piston,wherein a first pressure chamber has a sidewall facing said first main piston and a second pressure chamber has a sidewall facing said second main piston, wherein said first auxiliary piston has a first abutment and said second auxiliary piston has a second abutment, said first abutment resting under hydraulic pressure at said sidewall of said first pressure chamber in at least one position of said control lever, and said second abutment resting under hydraulic pressure at said sidewall of said second pressure chamber in at least one position of said control lever.