Power plants – Pressure fluid source and motor – Condition responsive control of pump or motor displacement
Reexamination Certificate
2008-07-08
2008-07-08
Leslie, Michael (Department: 3745)
Power plants
Pressure fluid source and motor
Condition responsive control of pump or motor displacement
C060S422000
Reexamination Certificate
active
11472503
ABSTRACT:
Disclosed is a hydraulic system for utility vehicles, in particular agricultural tractors, for supplying primary and/or auxiliary pressure medium consumers (6, 11, 12) with pressure medium, comprising a pump (1), whose pressure and flow are controlled as a function of the load pressure of the pressure medium consumers by a pressure and flow controller (13) to which whenever auxiliary pressure medium consumers (11, 12) are operating, a higher load pressure compared to the actual load pressure is reported through an amplifier device. In order to obtain rapid response of an actuated auxiliary pressure medium consumer it is proposed that the amplifier device (29) consists of a proportionally controllable pressure reducing valve (39).
REFERENCES:
patent: 6105367 (2000-08-01), Tsuruga et al.
patent: 6314729 (2001-11-01), Crull et al.
patent: 6644025 (2003-11-01), Oberhausser et al.
patent: 6874318 (2005-04-01), MacLeod
Brockmann Andreas
Martens Michael
AGCO GmbH
Leslie Michael
Schneider, Esq. Ryan A.
Troutman Sanders LLP
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