Power plants – Pressure fluid source and motor – Condition responsive control of motive fluid flow
Patent
1990-07-30
1992-12-15
Look, Edward K.
Power plants
Pressure fluid source and motor
Condition responsive control of motive fluid flow
60494, 137115, 137117, F16D 3102, G05D 1100
Patent
active
051706261
ABSTRACT:
A hydraulic circuit supplies a controlled hydraulic flow rate to a hydraulically operated automotive component, such as, a power steering unit for satisfying the characteristic function thereof. The hydaulic circuit includes therein a flow control valve unit. In the flow control valve unit, throttle passages are provided each for throttling a hydraulic flow fed from a pump to increase its speed. Orifices are further provided in the flow control valve unit to regulate a hydraulic flow rate to be supplied toward the hydraulically operated automotive component. Each orifice functions to allow less hydraulic flow rate to pass therethrough toward the hydraulically operated automotive component corresponding to increasing speed of a hydraulic flow just upstream thereof. Each orifice is provided between the adjacent throttle passages for preventing the hydraulic flow speed at the throttle passages from directly reflecting on the hydraulic flow speed just upstream of the orifices, thus, ensuring a given minimum hydraulic flow rate for the hydraulically operated automotive component in a range where the hydraulic flow speed at the throttle passages exceeds a given high level.
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Hamao Miyoko
Ohtaki Mizuo
Atsugi Unisia Corporation
Look Edward K.
Ryznic John
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