Patent ID: 7163094

Claim:
A transmission shift system comprising a synchronizing device for an idler wheel ( 2 ) comprising a sliding sleeve for engaging with the idler wheel ( 2 ), the sliding sleeve ( 6 ) being non-rotatably and axially displaceable on a shaft ( 1 ) by way of a piston ( 10 ) directly connected thereto, the sliding sleeve ( 6 ) is supported by the shaft ( 1 ) via a hub element ( 7 ) and a releasable catch device ( 3 , 8 , 9 ) facilitates axial movement of the sliding sleeve ( 6 ) relative to the hub element ( 7 ), and a synchronizing operation can be implemented as a function of hydraulic pressure supplied to the piston ( 10 ), in a non-switched state, an actuation pressure supplied to the piston ( 10 ) is equal to an initial pressure (P 0 ) and no axial movement of the sliding sleeve ( 6 ) occurs; in a release state, the actuation pressure supplied to the piston ( 10 ) is above a second pressure (P s ), at which the releasable catch device ( 3 , 8 , 9 ) releases the sliding sleeve ( 6 ), so that the sliding sleeve ( 6 ) becomes axially displaced by the piston ( 10 ) relative to the hub element ( 7 ) so that the sliding sleeve ( 6 ) and the idler wheel ( 2 ) engage with one another; and during an RPM adjustment state, the actuation pressure supplied to the piston ( 10 ) is at a first pressure (P 1 ), which is greater than the initial pressure (P 0 ) but lower than the second pressure (P s ), such that the piston ( 10 ) induces axial displacement of the sliding sleeve ( 6 ) and the hub element ( 7 ) toward the idler wheel ( 2 ) so as to compensate for any RPM rotational difference between the sliding sleeve ( 6 ) and the idler wheel ( 2 ).