Rotary expansible chamber devices – Working member has planetary or planetating movement – Plural working members or chambers
Patent
1989-08-09
1991-04-23
Smith, Leonard E.
Rotary expansible chamber devices
Working member has planetary or planetating movement
Plural working members or chambers
F01C 110, F01C 1908
Patent
active
050095820
ABSTRACT:
An improved gerotor device is disclosed, usable as either a pump or a motor, of the type including a gerotor gear set (17), and a movable valve member which may have either purely rotary motion (55), or may have both orbital and rotational motion (127). The valve member defines two groups of valve ports (63,65; 163,165) communicating with an inlet port (57) and an outlet port (61). The movable valve member is in sliding, sealing valving action with and an adjacent stationary valve plate (19'; 119') which defines a set of stationary fluid passages (67a-67g; 167a-167i) which communicate with the gerotor volume chambers (29a-29g). The stationary valve plate, in accordance with the invention, also defines a plurality of secondary fluid passages (77a-77g; 177a-177i) each of which is diametrically opposite one of the primary fluid passages (67a-67g; 167a-167i). The primary and secondary fluid passages are interconnected by cut-out portions within the stationary valve plate, defining fluid passages (81a-81g; 181a-181i), thus effectively doubling the orifice area during valving action, and substantially reducing the no-load pressure drop when the device is being used as a motor, or substantially reducing the tendency toward cavitation when the device is used as a pump.
REFERENCES:
patent: 2956506 (1960-10-01), Brundage
patent: 3352247 (1967-11-01), Easton
patent: 3964842 (1976-06-01), White
patent: 4219313 (1980-08-01), Miller et al.
patent: 4474544 (1984-10-01), White, Jr.
patent: 4533303 (1985-08-01), Petersen et al.
patent: 4741681 (1988-05-01), Bernstrom
patent: 4877383 (1989-10-01), White, Jr.
Eaton Corporation
Kasper L. J.
Smith Leonard E.
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