Patent ID: 8074533

Claim:
A servo-assistance device ( 10 ) for a shift mechanism of a motor vehicle transmission, with which a characteristic curve is produced which, as a function of either a manual shifting force or a shift phase, comprises ranges of different gradients or proportionality to the manual shifting force, the servo-assistance device ( 10 ) comprising an element ( 20 ) upon which the manual shifting force to be assisted acts, wherein the servo-assistance device ( 10 ) comprises a valve ( 56 ) with valve pistons ( 40 , 48 ), and means ( 42 , 44 , 50 , 52 ) upon which a servo-pressure ( 60 ) acts such that the servo-pressure ( 60 ) acts upon one of the valve pistons ( 40 , 48 ) to produce a first range of the characteristic curve and, beyond a specifiable servo-pressure ( 60 ), the means ( 42 , 44 , 50 , 52 ) co-operates with the valve pistons ( 40 , 48 ) such that a second range of the characteristic curve is produced, whose gradient is smaller than a gradient of the first range of the characteristic, in such manner that the element ( 20 ) maintains its current position.