Valve-in-star motor balancing

Details Valve-in-star motor balancing Valve-in-star motor balancing

1995-07-25

1996-05-14

Freay, Charles

Rotary expansible chamber devices

Working member has planetary or planetating movement

Plural working members or chambers

418186, 418187, F03C 208, F04C 210

Patent

active

055162681

ABSTRACT:
A gerotor motor of the valve-in-star type in which the star (27) is disposed adjacent a stationary valve plate (15). The stationary valve plate (15) defines a plurality N+1 of stationary ports (65) in communication with the inlet port (55). The gerotor star (27) defines a plurality N of fluid ports (51) each including a radially inner portion (53). The inner portions (53) and the stationary port (65) are in commutating fluid communication as the star (27) orbits and rotates, in accordance with an important aspect of the invention. As a result, the star member (27) is exposed to a smaller area of pressurized fluid at the stationary valve plate (15), thus making it possible to achieve more consistent overbalance of the star, for either direction of rotation. This results in substantially improved overall efficiency of the motor.

REFERENCES:
patent: 3233524 (1966-02-01), Charlson
patent: 3825376 (1974-07-01), Petersen et al.
patent: 3876343 (1975-04-01), Giversen
patent: 4357133 (1982-11-01), White
patent: 4411606 (1983-10-01), Miller
patent: 4715798 (1987-12-01), Bernstrom
patent: 4741681 (1988-05-01), Bernstrom
patent: 4976594 (1990-12-01), Bernstrom

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