Motors: expansible chamber type – Working member position feedback to motive fluid control – Follower type
Patent
1985-06-21
1987-03-24
Garrett, Robert E.
Motors: expansible chamber type
Working member position feedback to motive fluid control
Follower type
91375R, F15B 910
Patent
active
046516220
ABSTRACT:
An improvement in 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 path extending from an 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. A part of the working oil flowing through the high pressure oil path is led to a reaction piston to restrain torsion of the torsion bar. The improvement is constituted by a cylindrical portion formed in the output shaft so as to surround the end portion on the output shaft side of the input shaft, a plurality of reaction pistons disposed within the cylindrical portion of the output shaft along their center lines lying on a plane perpendicular to the center axis of the input shaft and arrayed radially at an equal interval in a circumferential direction, a control oil path branched from the high pressure oil path and communicating with the reaction pistons, and a plurality of longitudinal grooves formed in the outer peripheral surface of the end portion on the output shaft side of the input shaft along the center axis of the input shaft and engaged with protrusions on the reaction pistons.
REFERENCES:
patent: 3867870 (1975-02-01), Shimoura
patent: 3930554 (1976-01-01), Ward
patent: 3998131 (1976-12-01), Adams
patent: 4034825 (1977-07-01), Adams
Garrett Robert E.
Mitsubishi Jidosha Kogyo Kabushiki Kaisha
Williamson Mark
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