Two-stage hydraulic pump

Details Two-stage hydraulic pump Two-stage hydraulic pump

2004-07-29

2008-05-13

Freay, Charles G (Department: 3746)

Pumps

Alternate series or parallel operation of plural pumps

C417S206000, C417S213000, C418S225000

Reexamination Certificate

active

07371053

ABSTRACT:
A two-stage hydraulic pump includes a rotor, a ring, and a plurality of rollers disposed in slots formed on the rotor. The pump has two inlet ports and two outlet ports, which are disposed inwardly and outwardly, respectively, of the rollers. A valve mechanism is incorporated which provides for flow directional control of the output flow of the pump between one portion of the discharge ports and a portion of the inlet ports when a low output flow is desired and blocking that interconnection while connecting the inner portion of the suction inlet side with a reservoir.

REFERENCES:
patent: 3081706 (1963-03-01), Drutchas et al.
patent: 3953153 (1976-04-01), Huber et al.
patent: 4102606 (1978-07-01), Huber et al.
patent: 4222712 (1980-09-01), Huber et al.
patent: 4578948 (1986-04-01), Hutson et al.
patent: 6857862 (2005-02-01), Johnson et al.

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