Motor vehicles – Surface effect vehicles – Dynamic seal or fluid curtain
Patent
1985-08-28
1987-02-24
Love, John J.
Motor vehicles
Surface effect vehicles
Dynamic seal or fluid curtain
180142, 60484, 417286, B60T 1300
Patent
active
046450262
ABSTRACT:
A vehicle control system has a system part 5 with a pump 6 feeding an open centre valve 4 which controls power assistance for vehicle steering. A second system part 11 has a pump 16 feeding an accumulator 13 and a closed centre valve 10 which controls operation of a clutch or brake booster 2. The pumps 6 and 16 are simultaneously driven by a motor 18. A by-pass valve 21 in conduit 20 is responsive through a pressure transducer 22 and an electrical control unit 19 to pressure in the accumulator 13 so that when the accumulator pressure attains a predetermined value the by-pass valve 21 opens communication between the output from pump 16 and a reservoir 7 to relieve the load on the motor 18. A pressure regulating valve 23 is provided in the steering system part 5. The valve 23 is responsive to pressure from the output of the second pump 16 through conduit 28 and permits the output from the pump 6 to flow by way of conduits 24 and 9 to the reservoir 7 when the pressure from the pump 16 attains a predetermined value so that the pressure available to the valve 4 is less than the maximum pressure available from the output of the pump 6 and the load on the motor 18 which is attributable to it driving the pump 6 is relieved. The valve 23 is preferably a spring loaded spool valve displaceable by expansion of a chamber through the admission of fluid from conduit 28.
REFERENCES:
patent: 2875843 (1959-03-01), Price
patent: 3170536 (1965-02-01), Van House et al.
patent: 3640301 (1972-02-01), Jania
patent: 3785393 (1974-01-01), Tanguy
patent: 4212165 (1980-07-01), Zirps
patent: 4317332 (1982-03-01), Schubert
Love John J.
McGiehan Donn
TRW Cam Gears Limited
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