Patent ID: 9562606
Date: 2017-02-07
CPC Classifications: F04B,F16H

Claim:
1. A hydrostatic positive displacement machine having a variable displacement volume, comprising: a cradle pivotable by a hydraulic positioning device around a pivot axis, wherein the positioning device comprises a positioning piston device to pivot the cradle around the pivot axis; a position-controlled control valve configured to generate a control pressure to pressurize the positioning piston device wherein the position-controlled control valve comprises a setting valve arrangement actuated by a setpoint device and a feedback valve arrangement mechanically coupled with the cradle to provide feedback on an actual pivot angle value of the cradle, wherein the setting valve arrangement is axially displaceable and non-rotatable, wherein the feedback valve arrangement is rotatable and axially non-displaceable, wherein the setting valve arrangement is positioned within the feedback valve arrangement, wherein control cross sections are exposed for pressurization of a first positioning piston compression chamber of the positioning piston device with a control pressure and for decompression of a second positioning piston compression chamber of the positioning piston device to a reservoir by axial displacement of the setting valve arrangement relative to the feedback valve arrangement, wherein the control cross sections are closed by rotational movement of the feedback valve arrangement relative to the setting valve arrangement, and wherein, on the setting valve arrangement, there is at least one actuator compression chamber which is pressurized by a hydraulic actuator pressure generated by a setpoint device in the form of a control pressure valve to move the setting valve arrangement to initiate operation of the position-controlled control valve.