Hydraulic drive with fast stroke and load stroke
AssigneeVoith Patent GmbH
InventorsHubert Schaber, Magnus Junginger
Life of this patent
Estimating the term…
Abstract
An autarkic hydraulic linear drive with a hydraulic arrangement and a method for operating the same. The hydraulic arrangement a pump unit, an equalizing reservoir, a load switching valve configured to switch between a fast extension and a load extension, and a hysteresis circuit. The hysteresis circuit is configured for triggering a first switching process of the load switching valve at a first control pressure and a second switching process of the load switching valve at a second control pressure that is different than the first control pressure.
Claims16
A hydraulic arrangement for an autarkic hydraulic linear drive, comprising:
- a pump unit;
- an equalizing reservoir;
- an automatically switching load switching valve configured to switch between a fast extension and a load extension;
- and
- a hysteresis circuit assigned to the load switching valve, the hysteresis circuit including a relief valve and a directional valve coupled with the relief valve, the relief valve and the directional valve being only for control volumes, the hysteresis circuit being configured for triggering a first switching process of the load switching valve at a first control pressure and a second switching process of the load switching valve at a second control pressure that is different than the first control pressure.
An autarkic hydraulic linear drive, comprising:
- a hydraulic arrangement, comprising:
- a pump unit;
- an equalizing reservoir;
- an automatically switching load switching valve configured to switch between a fast extension and a load extension;
- and
- a hysteresis circuit assigned to the load switching valve, the hysteresis circuit including a first valve and a second valve coupled with the first valve, the hysteresis circuit being configured for triggering a first switching process of the load switching valve at a first control pressure and a second switching process of the load switching valve at a second control pressure that is different than the first control pressure;
- and
- a piston-cylinder unit having a first cylinder chamber in the form of an annular chamber and a second cylinder chamber in the form of a piston chamber.
A method for operating an autarkic hydraulic linear drive, comprising:
- providing a hydraulic arrangement for the autarkic hydraulic linear drive, the hydraulic arrangement including a pump unit with a pump, an equalizing reservoir, an automatically switching load switching valve configured to switch between a fast extension and a load extension, and a hysteresis circuit assigned to the load switching valve, the hysteresis circuit including a relief valve and a directional valve coupled with the relief valve, the hysteresis circuit being configured for triggering a first switching process of the load switching valve at a first control pressure and a second switching process of the load switching valve at a second control pressure that is different than the first control pressure, and a piston-cylinder unit for the autarkic hydraulic linear drive including an annular chamber and a piston chamber;
- and
- feeding a hydraulic medium to the annular chamber, by the pump, for retracting, and wherein during fast retraction the hydraulic medium, passing by a pump connection, is entirely supplied to the annular chamber.
Dependencies are inferred from the claim text.