Motor vehicles – Surface effect vehicles – Dynamic seal or fluid curtain
Patent
1989-08-11
1991-06-11
Marmor, Charles A.
Motor vehicles
Surface effect vehicles
Dynamic seal or fluid curtain
60418, B62D 500
Patent
active
050224824
ABSTRACT:
A hydraulic control system for, e.g., electrically driven vehicles, comprising a hydraulic, double-acting steering piston-cylinder device which co-acts with a control unit which is actuable by means of a steering member, and which is connected to a hydraulic pump, driven by an electric motor, and to a tank, and which includes a control signal outlet through which a control signal is delivered for maintaining and interrupting the supply of steering hydraulic fluid to the steering-piston cylinder device. In order to enable the vehicle to be steered directly, even when the pump is not activated, an accumulator (20) is provided in the hydraulic connection (12) between the pump (11) and the control unit (8), at a location between a check valve (17) and a control vale (19) which prevent the flow of hydraulic fluid from the accumulator 920) and of which valves the valve located upstream of the accumulator (20) is intended to open in response to the control signal delivered by the control unit (8), this control signal constituting a pressure increase, so as to permit hydraulic fluid to flow from the accumulator (20) to the steering piston-cylinder device (1). The system also includes means (39, 40) operative to start the pump motor (13) upon the occurrence of a pressure decrease in the hydraulic connection (12) between the check valve 17and the control valve 19, therewith to provide the requisite flow of hydraulic steering fluid through the action of the pump (11).
REFERENCES:
patent: 3882952 (1975-05-01), Crabb
patent: 4076096 (1978-02-01), Hushower et al.
patent: 4099378 (1978-07-01), Shaffer
patent: 4326558 (1982-04-01), Gage
patent: 4337620 (1982-07-01), Johnson
patent: 4470260 (1984-09-01), Miller et al.
patent: 4723412 (1988-02-01), Buschmann
patent: 4751977 (1988-06-01), Cordiano
Andersson Bo
Holmgren Anders
Bahco Hydrauto AB
Kagen Alan M.
Marmor Charles A.
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