Power plants – Pressure fluid source and motor – Expansible chamber type volumetric responsive measuring...
Patent
1989-01-17
1990-06-26
Look, Edward K.
Power plants
Pressure fluid source and motor
Expansible chamber type volumetric responsive measuring...
60393, 180132, 180149, 418 613, B62D 508
Patent
active
049360949
ABSTRACT:
A torque-generating steering device is provided for use with a pump (19) having a pressure compensator (23) for varying the output of the pump. The device includes a gerotor displacement means (43) which provides a relatively high-torque output to an output shaft (29) in response to the flow of fluid through the gerotor. A spool valve (73) and sleeve valve (75) define a fluid path (119) from an inlet port (13) through the gerotor to an outlet port (15). The fluid path includes a main variable flow control orifice (121) in series flow between the inlet and the gerotor, the orifice having a zero flow area when the spool and sleeve are in their neutral position, and a maximum flow area when the spool and sleeve are in an operating position. The device defines a load-sensing port (115) communicating with the pressure compensator (23) and with the fluid path (119), downstream of the orifice (121).
REFERENCES:
patent: Re25291 (1962-12-01), Charlson
patent: 4023646 (1977-05-01), Heisig et al.
patent: 4109679 (1978-08-01), Johnson
patent: 4336687 (1982-06-01), Morgan
patent: 4381905 (1983-05-01), Peterson
Eaton Corporation
Kasper L. J.
Look Edward K.
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