Patent ID: 6443706
Filing Date: 2002-09-03
Classification: F04B

Abstract:
A hydrostatic axial piston machine comprising:a pivotable swash plate; at least one positioning piston for setting the diagonal position of said swash plate; an electrically activated control valve for controlling said at least one positioning piston, wherein said electrically activated control valve is a rotary disk valve having a rotatable control shaft and a rotating sleeve surrounding said control shaft; and a stepper motor activating said electrically activated control valve, wherein one of said control shaft and said rotating sleeve of said rotary disk valve is non-rotationally connected to an output shaft of said stepper motor and the other of said control shaft and said rotating sleeve of said rotary disk valve is connected to said swash plate, wherein said rotary disk valve has at least one groove in said control shaft which is pressurized with supply pressure and one groove in said rotatable shaft which is pressurized with tank pressure, and wherein said rotary disk valve has a plurality of grooves in said rotating sleeve to pressurize said at least one positioning piston with tank pressure or control pressure.