Motor vehicles – Surface effect vehicles – Dynamic seal or fluid curtain
Patent
1993-10-21
1996-05-14
Hill, Mitchell J.
Motor vehicles
Surface effect vehicles
Dynamic seal or fluid curtain
180149, B62D 506, B62D 5083
Patent
active
055159389
ABSTRACT:
A power steering apparatus having a fluid source for discharging pressurized fluid, a power cylinder, a control valve responsive to operation of a steering wheel for supplying the power cylinder with pressurized fluid from the fluid source, and a reservoir. The control valve has a first control portion for controlling the flow of pressurized fluid from the fluid source to the reservoir, and a second control portion for controlling the flow of pressurized fluid to the power cylinder. The first control portion has two paths connecting the fluid source and the reservoir, each of the paths being formed with at least one variable orifice of a center-open type which opens when the control valve is in a neutral state. The second control portion has two supply paths communicating with the fluid source and a pair of chambers of the power cylinder, each of the supply paths being formed with a variable orifice of a center-close type which closes when the control valve is in the neutral state, and two drain paths communicating with the pair of chambers and the reservoir, each of the drain paths being formed with a variable orifice of a center-open type which opens when the control valve is in the neutral state.
REFERENCES:
patent: 4460016 (1984-07-01), Haga et al.
patent: 4469342 (1984-09-01), Millard
patent: 4516471 (1985-05-01), Duffy
patent: 4705129 (1987-11-01), Fassbender
patent: 5092418 (1992-03-01), Suzuki et al.
Fukumura Kenichi
Haga Kyosuke
Inaguma Yoshiharu
Kato Hideya
Mori Katsuhisa
Hill Mitchell J.
Toyoda Koki Kabushiki Kaisha
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