Motors: expansible chamber type – Fluid supply through diverse paths to single expansible chamber – Serially arranged reversing valves
Patent
1988-06-27
1989-06-27
Garrett, Robert E.
Motors: expansible chamber type
Fluid supply through diverse paths to single expansible chamber
Serially arranged reversing valves
91375R, 91448, 60444, F15B 1304, F15B 910
Patent
active
048418412
ABSTRACT:
A steer-by-driving control for controlling a hydrostatic steering unit to permit consistent operator input during forward and reverse travel has a valve assembly including a distribution valve and a pair of sleeve valves. The sleeve valves are rotatably mounted on the distribution valve and are interconnected by a gear arrangement. One sleeve valve is rotated by the operator in response to a steer request while the other sleeve member, due to the gearing, rotates oppositely. The distribution valve member controls fluid flow through forward and reverse steer passages formed in the sleeve valves to a signal valve for distribution to a control member of a hydrostatic unit. The distribution valve member is subjected to rotary input from the hydrostatic steering unit to stop fluid flow when the proper steer position has been reached. The signal valve is positioned according to the direction of the vehicle operation to selectively send the steer signals to the proper portions of the hydrostatic control.
REFERENCES:
patent: 3717212 (1973-02-01), Potter
patent: 3946560 (1976-03-01), MacIntosh et al.
patent: 4372341 (1983-02-01), Crawley
patent: 4458485 (1984-07-01), Seelmann
Morrow James W.
Redelman James A.
Garrett Robert E.
General Motors Corporation
Scherer Donald F.
Williamson M.
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