Motor vehicles – Surface effect vehicles – Dynamic seal or fluid curtain
Patent
1980-03-03
1981-09-01
Pekar, John A.
Motor vehicles
Surface effect vehicles
Dynamic seal or fluid curtain
60384, 180139, B62D 508
Patent
active
042866847
ABSTRACT:
PCT No. PCT/US80/00228 Sec. 371 Date Mar. 3, 1980 Sec. 102(e) Date Mar. 3, 1980 PCT Filed Mar. 3, 1980
A hydraulic servo steering system (10) for vehicles has a steering valve (24) for directing fluid to steering cylinders (16,17) in response to pilot fluid directed to one end of the steering valve (24) from a hand metering unit (31). A servo cylinder (19) directs a volume of fluid to the other end of the steering valve (24) sufficient for returning the steering valve (24) to its centered position in response to turning of the vehicle. A pair of pilot operated check valves (53,54) positioned in the lines (51,52) between the servo cylinder (19) and the steering valve (24) are opened in response to fluid pressure being established in the lines (51,52) by a means (71). Should one of the lines (51,52) rupture, the resultant drop in fluid pressure in the lines (51,52) causes the check valves (53,54) to close thereby isolating the steering valve (24) from the ruptured lines (51,52). Thereafter the steering valve (24) can be operated in a "jerk steer" manner for emergency steering of the vehicle.
REFERENCES:
patent: 2521652 (1950-09-01), Rockwell
patent: 2917125 (1959-12-01), Donner
patent: 3016708 (1962-01-01), Gordon et al.
patent: 3189119 (1965-06-01), Moreno et al.
patent: 3326317 (1967-06-01), Marquardt
patent: 3468126 (1969-09-01), Mercier
patent: 3991846 (1976-11-01), Chichester et al.
patent: 4253540 (1981-03-01), Berg
Caterpillar Tractor Co.
Grant John W.
Pekar John A.
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