Control valve and four-wheel steering system including control v

Details Control valve and four-wheel steering system including control v Control valve and four-wheel steering system including control v

1990-04-17

1991-10-01

Rice, Kenneth R.

Motor vehicles

Including one or more ski-like or runner members

With at least one surface-engaging propulsion element

180143, 13762566, 91517, 91529, B62D 508

Patent

active

050525069

ABSTRACT:
A control valve includes a first valve having a cylinder and a piston arranged in the cylinder. The piston defines in the cylinder a pressure receiving chamber and first and second output pressure chambers, and is moved by pilot pressure applied to the pressure receiving chamber to change volumes of the first and second output pressure chambers. The output pressure chambers are connected to each other through a throttle control valve which generates pressure difference corresponding to a rate of change in volumes of the output pressure chambers, between the output pressure chambers. A main valve is connected to the throttle control valve and includes an inlet port, output ports, and a valve member located between the input and output ports. The valve member is moved in accordance with the pressure difference between the first and second output pressure chambers to control hydraulic pressure output from the output ports.

REFERENCES:
patent: 4119172 (1978-10-01), Yanagishima
patent: 4579186 (1986-04-01), Uno et al.
patent: 4669567 (1987-06-01), Nakamura et al.
patent: 4781262 (1988-11-01), Nakamura et al.
patent: 4811805 (1989-03-01), Yoshida
patent: 4917205 (1990-04-01), Kobayashi et al.
patent: 4923170 (1990-05-01), Takaoko et al.

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