Power plants – Pressure fluid source and motor – Condition responsive control of motive fluid flow
Patent
1994-03-29
1995-12-05
Look, Edward K.
Power plants
Pressure fluid source and motor
Condition responsive control of motive fluid flow
60494, 91375R, 180141, F16D 3102, F15B 910
Patent
active
054718384
ABSTRACT:
A power steering apparatus for a motor vehicle is provided with a metering orifice arranged on a supply passage and a flow control device in parallel relation with the metering orifice. The flow control valve includes a spool and a spring and moves the spool against the force of the spring in response to the pressure difference across the metering orifice for returning an excess part of operating fluid discharged from an engine-driven pump to an intake side of the pump so as to keep the flow rate towards a power assist gear unit almost constant regardless of changes in rotational speed of the pump. A drooping device cooperating with the flow control valve is provided comprising a control orifice at the upstream of the metering orifice and a bypass valve in communication with a spring chamber of the flow control valve retaining the spring. When the pressure difference across the control orifice exceeds a predetermined value with the increase in the pump rotational speed to a predetermined speed, the bypass valve operates to drain the pressure in the spring chamber. The load acting on the pump is thereby relieved. A bypass control valve is responsive to the pressure at the downstream of the metering orifice so as to restrict the draining of the pressure in the spring chamber when the power assist gear unit is brought into operation.
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Fukumura Kenichi
Kato Hideya
Suzuki Mikio
Look Edward K.
Nguyen Hoang
Toyoda Koki Kabushiki Kaisha
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