Two speed gerotor motor with centrally located valve and commuta

Details Two speed gerotor motor with centrally located valve and commuta Two speed gerotor motor with centrally located valve and commuta

1990-10-31

1991-12-10

Vrablik, John J.

Rotary expansible chamber devices

Multistage

418 60, 418 613, F03C 208

Patent

active

050713272

ABSTRACT:
This gerotor-type hydraulic motor operates at two speeds (low speed, high torque and high speed, low torque) at a given flow rate and pressure of driving hydraulic fluid. It includes first and second rotating power elements disposed along an axis. Between the first and second power elements are first and second commutators. Located between the two commutators is a valve piece which is an integral portion of the motor. The valve piece selectively directs fluid, either in parallel or in series, through the first and second commutators, respectively, to the first and second power elements. Preferably the valve piece includes a spool valve. Also preferably the valve piece includes inner and outer concentric galleries located on opposite sides of the spool valve.

REFERENCES:
patent: 3778198 (1973-12-01), Giversen
patent: 3892503 (1975-07-01), Getman
patent: 3910732 (1975-10-01), Lusztig
patent: 3944378 (1976-03-01), McDermott
patent: 4480971 (1984-11-01), Swedberg
patent: 4586885 (1986-05-01), Middlekauff
patent: 4875841 (1989-10-01), White, Jr.

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