Hydraulic pressure supply unit

Details Hydraulic pressure supply unit Hydraulic pressure supply unit

2006-10-27

2009-02-24

Leslie, Michael (Department: 3745)

Power plants

Pressure fluid source and motor

Pump means moves motive fluid from one chamber to an...

C060S430000

Reexamination Certificate

active

07493757

ABSTRACT:
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.

REFERENCES:
patent: 3864911 (1975-02-01), Gellatly et al.
patent: 3903698 (1975-09-01), Gellatly et al.
patent: 4008571 (1977-02-01), Evans
patent: 4184331 (1980-01-01), Bentley
patent: 4961316 (1990-10-01), Corke et al.
patent: 5179836 (1993-01-01), Dantlgraber
patent: 6886332 (2005-05-01), Kubinski et al.

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