Patent ID: 7526919

Claim:
Drive system having a first driving shaft and a cylinder barrel of a hydrostatic piston machine, which cylinder barrel is connected to a second driving shaft in a torsionally rigid manner, the displacement volume of the hydrostatic piston machine being able to be shifted by means of a shifting means and the first driving shaft being able to be mechanically coupled to the second driving shaft through a clutch, wherein the shifting means and the clutch can be actuated hydraulically and, for the purpose of actuation, are connected to a common control-pressure connection, wherein for the purpose of hydraulic actuation of the clutch, there is provided a clutch piston surface to which a hydraulic force can be applied, and for the purpose of applying a force to which a connection is realized between the control-pressure connection, and the clutch via a supply-line channel realized in a housing of the hydrostatic piston machine and/or a transmission housing, wherein for the purpose of actuating the clutch, a clutch valve is provided in the supply-line channel, through which clutch valve there is settable the hydraulic force acting on the clutch piston surface, and wherein a hydraulic force can be applied to the clutch piston surface through a pneumatic-hydraulic converter.