Two speed geroter motor with external pocket recirculation

Details Two speed geroter motor with external pocket recirculation Two speed geroter motor with external pocket recirculation

1999-04-14

2000-08-08

Denion, Thomas

Rotary expansible chamber devices

Working member has planetary or planetating movement

Plural working members or chambers

F01C 102

Patent

active

060992808

ABSTRACT:
A two-speed gerotor motor of the type having a stationary valve member (19) defining a plurality of stationary valve passages, each including an upstream passage portion for commutating fluid communication with a moveable valve member (43), and a downstream passage portion in continuous fluid communication with a volume chamber (33) of the gerotor gear set. In some of the stationary valve passages (113), the upstream (115) and downstream (117) passage portions are blocked from direct fluid communication. A control valve spool (89) has a first position (FIG. 8) permitting unrestricted fluid communication between the upstream and downstream passage portions, for normal low-speed operation. The control valve spool has a second position (FIG. 9) blocking communication between the upstream (115) and downstream (117) passage portions, and connecting all of the downstream portions together, communicating with a fluid accumulation region (91), such that fluid from those volume chambers recirculates, to provide a high-speed mode of operation.

REFERENCES:
patent: 3788198 (1974-01-01), Giversen
patent: 4480971 (1984-11-01), Swedberg
patent: 4715798 (1987-12-01), Bernstrom
patent: 4741681 (1988-05-01), Bernstrom
patent: 4756676 (1988-07-01), Bernstrom
patent: 5516268 (1996-05-01), Kassen et al.
patent: 5593296 (1997-01-01), Bernstrom et al.
patent: 5624248 (1997-04-01), Kassen et al.

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