A hydrostatic positive displacement machine (1) with a variable displacement volume includes a cradle (3) pivoted by a hydraulic positioning device (7) having a positioning piston device (8). A position-controlled control valve (10) generates a control pressure and includes axially displaceable and
A hydrostatic positive displacement machine (1) with a variable displacement volume includes a cradle (3) pivoted by a hydraulic positioning device (7) having a positioning piston device (8). A position-controlled control valve (10) generates a control pressure and includes axially displaceable and locked setting valve means (20) and the rotatable feedback valve means (21). Control cross sections are exposed by an axial displacement of the setting valve means (20) relative to the feedback valve means (21) and are closed by rotational movement of the feedback valve means (21) relative to the setting valve means (20).
대표청구항▼
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-contro
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, andwherein, 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. 2. The hydrostatic positive displacement machine as recited in claim 1, wherein the control cross sections comprise helical control grooves and control orifices that interact with the helical control grooves. 3. The hydrostatic positive displacement machine as recited in claim 2, wherein the helical control grooves are inclined with respect to a longitudinal axis of the position-controlled control valve. 4. The hydrostatic positive displacement machine as recited in claim 3, wherein the helical control grooves have an identical pitch. 5. The hydrostatic positive displacement machine as recited in claim 2, wherein the control orifices are formed by radial borings or radially oriented slots. 6. The hydrostatic positive displacement machine as recited in claim 1, wherein the setting valve arrangement is non-rotatably fastened to a control valve housing and a locking device prevents rotation of the setting valve arrangement. 7. The hydrostatic positive displacement machine as claimed in claim 6, wherein the locking device comprises a locking pin, with which the setting valve arrangement is non-rotatably secured to the control valve housing. 8. The hydrostatic positive displacement machine as recited in claim 1, wherein the setting valve arrangement comprises a longitudinally displaceable control slide valve and the feedback valve arrangement comprises a rotatable sleeve, wherein the control slide valve is longitudinally displaceable in the sleeve. 9. The hydrostatic positive displacement machine as recited in claim 2, wherein the helical control grooves are on the setting valve arrangement and the control orifices are on the feedback valve arrangement. 10. The hydrostatic positive displacement machine as recited in claim 2, wherein the helical control grooves are on the feedback valve arrangement and the control orifices are on the setting valve arrangement. 11. The hydrostatic positive displacement machine as recited in claim 2, comprising a configuration selected from: (a) at least one first helical control groove connected with a control pressure source, at least one second helical control groove connected with a reservoir, at least one first control orifice in communication with the first positioning piston compression chamber of the positioning piston device, and at least one second control orifice in communication with the second positioning compression chamber of the positioning piston device; or(b) at least one first control orifice connected with a control pressure source, at least one second control orifice connected with a reservoir, at least one first helical control groove in communication with the first positioning piston compression chamber of the positioning piston device, and at least one second helical control groove in communication with the second positioning piston compression chamber of the positioning piston device. 12. The hydrostatic positive displacement machine as recited in claim 11, wherein the first helical control groove and the second helical control groove are of equal or different length. 13. The hydrostatic positive displacement machine as recited in claim 11, wherein the first helical control groove and the second helical control groove are offset from each other by an angle of 90°. 14. The hydrostatic positive displacement machine as recited in claim 11, wherein the first control orifice and the second control orifice are offset from each other at an angle of 90°. 15. The hydrostatic positive displacement machine as recited in claim 11, wherein the first helical control groove, the second helical control groove, the first control orifice, and the second control orifice are each formed by a pair of control grooves and a pair of control orifices which are opposite each other at an angle of 180°. 16. The hydrostatic positive displacement machine as recited in claim 8, wherein the control slide valve includes connecting borings, by means of which the helical control grooves or the control orifices of the control slide valve are connected with the control pressure source and the reservoir or with the positioning piston compression chambers. 17. The hydrostatic positive displacement machine as recited in claim 16, including an annular groove on an exterior cylindrical surface of the control slide valve, by means of which a connecting boring is connected to a connection of the control valve housing. 18. The hydrostatic positive displacement machine as recited in claim 17, wherein the sleeve includes an annular groove and a connecting opening that extends to an interior cylindrical surface of the sleeve for connection of the annular groove of the control slide valve with the connection of the control valve housing. 19. The hydrostatic positive displacement machine as recited in claim 17, wherein the annular groove is sized so that the helical control grooves or the control orifices are connected with the control pressure source or with the reservoir over an entire axial stroke range of the setting valve arrangement. 20. The hydrostatic positive displacement machine as recited in claim 16, wherein the connecting boring empties into a control pressure chamber located between the control slide valve and the control valve housing, which control pressure chamber is connected with a connection of the control valve housing. 21. The hydrostatic positive displacement machine as recited in claim 8, wherein the sleeve includes annular grooves that are separated from each other in a longitudinal direction, by means of which the control orifices or helical control grooves of the sleeve are connected with at least one of the positioning piston compression chambers, the control pressure source, and the reservoir. 22. The hydrostatic positive displacement machine as recited in claim 8, wherein the helical control grooves are on an exterior cylindrical surface of the control slide valve and the control orifices are on an interior cylindrical surface of the sleeve. 23. The hydrostatic positive displacement machine as recited in claim 1, wherein the control valve is oriented with a longitudinal axis concentric to or axially parallel offset from the pivot axis of the cradle. 24. The hydrostatic positive displacement machine as recited in claim 1, wherein the feedback valve arrangement is mechanically connected with the cradle by a connecting web which extends through a slot recess in the control valve housing. 25. The hydrostatic positive displacement machine as recited in claim 1, wherein the control pressure valve is electrically actuated. 26. The hydrostatic positive displacement machine as recited in claim 1, wherein the position-controlled control valve is located in a rotary bearing of the cradle.
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이 특허에 인용된 특허 (8)
Saito Shoichi (Karatsu JA), Electric-hydraulic pulse motor having an improved rotary guide valve means.
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