Hydraulic system and pump

Details Hydraulic system and pump Hydraulic system and pump

1997-09-16

1999-06-29

Nguyen, Hoang

Power plants

Pressure fluid source and motor

With control means for structure storing work driving energy

60477, 4182066, F16D 3102

Patent

active

059161396

ABSTRACT:
A hydraulic system includes a hydraulic fluid pump, a hydraulic cylinder, and a pressure accumulator. A hydraulic fluid valve is movable between a first position and a second position. In the first position, the valve directs fluid from the pump outlet to the hydraulic cylinder and from the accumulator to the pump inlet. In the second position the valve directs fluid from the pump outlet to the accumulator and from the hydraulic cylinder to the pump inlet. In this way pressurized hydraulic fluid from the cylinder can be stored in the accumulator for reuse. The pump includes high pressure seals at both ends of the driven shaft in order to reduce or eliminate offset forces of the type that might increase friction and wear.

REFERENCES:
patent: 2672100 (1954-03-01), Harvey
patent: 3985063 (1976-10-01), Lemon
patent: 4465442 (1984-08-01), Lang et al.
patent: 4561248 (1985-12-01), Quin et al.
patent: 4648817 (1987-03-01), Mariani
patent: 4671126 (1987-06-01), Sable
patent: 4917583 (1990-04-01), Frings et al.
patent: 5196770 (1993-03-01), Champs et al.
"Lufkin Long Stroke Hydraulic pumping unit," Lufkin Foundry & Machine Co., Lufkin, TX, pp. 3066, 3067, prior to Aug. 1997 (no actual date).

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