Power plants – Pressure fluid source and motor – With control means for structure storing work driving energy
Reexamination Certificate
2005-12-13
2005-12-13
Look, Edward K. (Department: 3745)
Power plants
Pressure fluid source and motor
With control means for structure storing work driving energy
C417S016000, C417S223000
Reexamination Certificate
active
06973781
ABSTRACT:
A system for maintaining hydraulic pressure in a vehicle hydraulic system when the vehicle is stopped or idling. A hydraulic pressure reserve system includes a primary hydraulic circuit that includes a hydraulic pump and a hydraulic sump and that provides hydraulic pressure to at least a hydraulically actuated transmission and an accumulator tank and control valve connected from the primary hydraulic circuit for storing a reserve of hydraulic fluid at an accumulator pressure. An accumulator control valve, such as a bi-directional valve, allows a flow of hydraulic fluid between the primary circuit and the accumulator tank according to the primary circuit pressure to raise the primary circuit pressure towards a desired pressure. The hydraulic pressure reserve system may include a primary gear connected from a primary drive and driving an auxiliary secondary gear with a primary drive clutch for connecting the secondary gear to drive the hydraulic pump and an auxiliary drive clutch for connecting the auxiliary secondary gear or a drive chain to drive the hydraulic pump.
REFERENCES:
patent: 4034628 (1977-07-01), Sakai et al.
patent: 4632207 (1986-12-01), Moore
patent: 5355676 (1994-10-01), Inokuchi
patent: 6350108 (2002-02-01), Haupt
patent: 95/12060 (1995-05-01), None
Brown Todd
Mozer Hebert
Sommer Stefan
Davis & Bujold P.L.L.C.
Leslie Michael
Look Edward K.
ZF Friedrichshafen AG
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