Flow rate control device for power steering

Details Flow rate control device for power steering Flow rate control device for power steering

2007-08-07

2007-08-07

Lopez, F. Daniel (Department: 3745)

Power plants

Pressure fluid source and motor

Apparatus having means responsive to or ameliorating the...

C060S468000, C180S423000

Reexamination Certificate

active

10504060

ABSTRACT:
Provided are a hydraulic pump7, an electromagnetic flow rate control valve2that controls the flow rate of hydraulic oil supplied from the hydraulic pump7to a power steering device PS, and a pressure compensating valve4that maintains a fixed pressure difference between upstream and downstream sides of the electromagnetic flow rate control valve2and bypasses an excess flow rate. The electromagnetic flow rate control valve2maintains a predetermined initial opening when a control current is zero, while an opening of the electromagnetic flow rate control valve decreases to become a minimum opening when the control current increases from zero, and the opening gradually becomes larger toward a maximum opening when a predetermined control current is exceeded.

REFERENCES:
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patent: 11-059451 (1999-03-01), None
patent: 2001-180507 (2001-07-01), None

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