Motors: expansible chamber type – Fluid supply through diverse paths to single expansible chamber – One path includes restriction
Patent
1984-03-22
1987-02-24
Garrett, Robert E.
Motors: expansible chamber type
Fluid supply through diverse paths to single expansible chamber
One path includes restriction
91375A, 91461, 180142, F15B 1304, F15B 910, F15B 1108, B62D 506
Patent
active
046448462
ABSTRACT:
A known power steering system of the type in which movement of a steering wheel is transmitted via a torsion bar to an oil path switching valve to actuate a power cylinder in a desired steering direction by switching a high pressure oil pump to the oil path switching valve and a low pressure oil path extending from the oil path switching valve to an oil tank and a part of working oil flowing through the high pressure oil path is led to a reaction piston to restrain torsion of the torsion bar, is improved by providing a main orifice disposed in the high pressure oil path and a control oil path branched from the upstream side of the main orifice in the high pressure oil path and communicating with the reaction piston. A pressure control valve is interposed in the control oil path for controlling the oil pressure so as to be equal to or lower than a predetermined highest pressure, and a bypass is provided for bypassing the upstream side and the downstream side of the main orifice. A device for increasing the oil pressure is provided in the bypass for closing the bypass to increase the oil pressure in the overall control oil path only when the oil pressure on the downstream side of the pressure control valve is equal to or lower than a predetermined lowest value.
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Garrett Robert E.
Kapsalas George
Mitsubishi Jidosha Kogyo Kabushiki Kaisha
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