Power plants – Pressure fluid source and motor – Manual pump pressurizes fluid to position output motor...
Patent
1975-03-19
1976-07-27
Geoghegan, Edgar W.
Power plants
Pressure fluid source and motor
Manual pump pressurizes fluid to position output motor...
60402, 60470, 91391R, F15B 1518
Patent
active
039712141
ABSTRACT:
The invention relates to an assisted hydraulic control, especially for steering all types of vehicles, and comprising a double-acting receiver or hydraulic cylinder, the piston of which forms two chambers in the cylinder, the piston rod extending into one of the chambers only and having no counter-rod extending into the other chamber. The first chamber thus has a smaller effective section than the second chamber, and the resulting asymmetry of operation of the piston and therefore of the steering is compensated by an arrangement in which the distributor valve means of the control, which couples a return conduit to the second of two actuating conduits in a first working position, isolates the return conduit and connects together the second of two pilot conduits, the second actuating conduit and the first actuating conduit in the second working position.
The conditions of actuation are thus rendered exactly symmetrical for both directions of working when the section of the first chamber is equal to one-half the section of the second chamber. The distributor valve is controlled in dependence on the direction of working of the pilot pump by mechanical, hydraulic or electrical control means.
REFERENCES:
patent: 1909166 (1933-05-01), Burrell
patent: 3218805 (1965-11-01), Pruvot
patent: 3360932 (1968-01-01), Lech et al.
patent: 3878763 (1975-04-01), Lang
Colvin Arthur B.
Geoghegan Edgar W.
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