Fluid pressure operated pump or motor with secondary valve means

Details Fluid pressure operated pump or motor with secondary valve means Fluid pressure operated pump or motor with secondary valve means

1980-02-04

1982-08-10

Vrablik, John J.

Rotary expansible chamber devices

Working member has planetary or planetating movement

Plural working members or chambers

418189, F01C 110, F01C 2112, F03C 208, F04C 210

Patent

active

043436005

ABSTRACT:
A rotary fluid pressure device (11) is disclosed of the type including an internal gear set (17) wherein the toothed members (23,27) define expanding and contracting volume chambers (29). The device further includes relatively movable valve elements (19,55) having engaging valve surfaces (71,73). One of the valve elements defines fluid passages (67) communicating with the volume chambers and the other valve element defines a plurality of valve passages (63,65). There is provided a secondary valving including a fluid passage (7) defined by the first valve element and a fluid passage (77) defined by the second valve element, the secondary fluid passages being in fluid communication when the respective volume chamber is approaching its minimum volume position to prevent trapping of fluid, and as it is leaving its minimum volume position, to prevent cavitation.

REFERENCES:
patent: 2956506 (1960-10-01), Brundage
patent: 3289542 (1966-12-01), Fikse
patent: 3473437 (1969-10-01), Ohrberg
patent: 3514234 (1970-05-01), Albers et al.
patent: 3775031 (1973-11-01), Hansen
patent: 3862814 (1975-01-01), Swedberg

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