Power plants – Pressure fluid source and motor – Expansible chamber type volumetric responsive measuring...
Patent
1977-08-12
1979-03-20
Geoghegan, Edgar W.
Power plants
Pressure fluid source and motor
Expansible chamber type volumetric responsive measuring...
60386, 91375A, F15B 908, B62D 506
Patent
active
041447123
ABSTRACT:
The invention relates to a power steering system of the metering type. Units of this type most commonly utilize gerotor type gear sets for the metering operation. During emergency operation when pressurized operating fluid is not available from a pump, steering is accomplished by operating the metering motor with the steering wheel which provides a pumping function for manually creating pressurized fluid. A problem with this type of unit is that a substantial amount of manual exertion is required to steer the vehicle under these conditions. Control units of this type have a universal drive between the rotatable valve thereof and the inner gerotor gear which has a combination rotating and orbiting movement. In this invention the universal drive has two main sections with a lost motion emergency device between the opposite ends. The emergency clutch device allows a sufficient relative displacement between the distributing valve and the inner wheel of the gerotor to provide an out-of-phase condition wherein fluid from the inlet port into both the expanding and contracting chambers of the metering gear set to substantially reduce the feed volume and consequently the steering forces to be applied.
REFERENCES:
patent: 3360932 (1968-01-01), Lech et al.
patent: 3452543 (1969-07-01), Goff et al.
patent: 3801239 (1974-04-01), Larson
Danfoss A/S
Easton Wayne B.
Geoghegan Edgar W.
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