Motor vehicles – Including one or more ski-like or runner members – With at least one surface-engaging propulsion element
Patent
1993-06-11
1995-08-08
Focarino, Margaret A.
Motor vehicles
Including one or more ski-like or runner members
With at least one surface-engaging propulsion element
180149, B62D 508
Patent
active
054390702
ABSTRACT:
A power steering apparatus having a hydraulic pump for outputting a pressurized fluid, an assist force generation mechanism hydraulically connected to the pump through a supply passage to generate an assist force in response to rotation of a steering wheel, wherein the assist force generation mechanism has a characteristic that the back pressure thereof increases when the steering wheel is rotated. The power steering apparatus further comprises a flow control valve having a spool which is moved in response to a pressure drop at a metering orifice disposed in the middle of the supply passage, so as to control the flow rate of the pressurized fluid to be constant. The spring chamber of the flow control valve is connected to a reservoir through a drain passage, and a drain valve is disposed in the drain passage for allowing the flow of pressurized fluid from the spring chamber to the reservoir when the back pressure of the assist force generation mechanism is low, and for prohibiting the flow of the pressurized fluid when the back pressure of the assist force generation mechanism increases.
REFERENCES:
patent: 4714413 (1987-12-01), Duffy
patent: 5048628 (1991-09-01), Rayner
patent: 5070956 (1991-12-01), Pawlak et al.
patent: 5184693 (1993-02-01), Miller
patent: 5267628 (1993-12-01), Tomiyoshi et al.
patent: 5279380 (1994-01-01), Frank et al.
patent: 5293953 (1994-03-01), Edahiro
Fukumura Kenichi
Haga Kyosuke
Inaguma Yoshiharu
Kato Hideya
Mori Katsuhisa
Focarino Margaret A.
Mattix Carla
Toyoda Koki Kabushiki Kaisha
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