Patent ID: 7055318

Claim:
A drive mechanism comprising: at least two hydraulic motors which may be supplied with a pressure medium, wherein a flow valve for throttling the pressure medium or control oil flow is associated to a meter-in or meter-out side of each hydraulic engine motor, wherein each flow valve is a variable hydraulic resistor having a maximum and a minimum open cross-section, wherein a valve body of the resistor is biased into its basic position of minimum open cross-section by a spring and may be subjected to a control pressure in a direction of increased or decreased open cross-section, wherein the control pressure is dependent on the pressure on the meter-in or meter-out side of a hydraulic engine motor, characterized in that control lines conducting the control pressure are connected to a line section between the hydraulic motor and the respective flow valve and interconnected via a pilot line, and wherein in each control line a check valve is provided which opens in such a way that the pressure in the pilot line may approximately be set to the one control pressure at the hydraulic motor having the lowest pressure medium flow rate.