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US 7,493,757 B2Granted
Hydraulic pressure supply unit
AssigneeHoerbiger Automatisierungstechnik Holding GmbH
InventorsManfred Kurz, Bertold Grimmer
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AssigneeHoerbiger Automatisierungstechnik Holding GmbH
InventorsManfred Kurz, Bertold Grimmer
Estimating the term…
A hydraulic pressure supply unit has two exits that are alternately pressurized, a reversible pumping unit including at least two pumps, reversible electric motor that drives all pumps jointly, if necessary with mutually de-locking check valves before the exits, and a supply for hydraulic medium. One pump is a low-pressure pump and one pump is a high-pressure pump, and the pressurized exits of both pumps are placed against the same exit of the pressure supply unit. Both exits of the high-pressure pump can be separated from the low-pressure pump via check valves, and each pump is connected to the supply for hydraulic medium via its own shuttle valve. Both exits of low-pressure pump can be connected to a tank via pressure on-off valves, and the control connections of pressure on-off valves are connected to the exits of the high-pressure pump in such a way that the control connection of that pressure on-off valve on the currently pressurized side is applied with pressure by the currently pressurized exit of the high-pressure pump.
A hydraulic pressure supply unit with two exits that are alternatively pressurized, with a reversible pumping unit comprising at least two pumps as well as a reversible electric motor that drives all pumps jointly and whereby one pump is a low-pressure pump and one pump is a high-pressure pump, and whereby the pressurized exits of both pumps are placed against the same exit of the pressure supply unit wherein both exits of high-pressure pump are separated from low-pressure pump by check valves, and whereby each pump is connected to the supply for hydraulic medium via its own shuttle valve, wherein both exits of low-pressure pump can be connected to a tank via pressure on-off valves, and whereby the control connection of pressure on-off valves is connected to the exits of high-pressure pump in such a way that the control connection of that pressure on-off valve on the currently pressurized side is applied with pressure by the currently pressurized exit of high-pressure pump.
Dependencies are inferred from the claim text.