Document Type and Number:
Japanese Patent JPS5078037
Kind Code:
A
Abstract:
A power assisted steering system for a vehicle including a steering wheel operatively connected to steered wheels comprising a housing, a nut-and-screw mechanism comprising a nut member and a screw member, an input shaft mounted in said housing, at least one flexible shaft connected at one end to the steering wheel and at its opposite end to said input shaft, intermeshing gear means carried by said input shaft and one of said members of said nut-and-screw mechanism, means operatively connecting the other member of said nut-and-screw mechanism to the steerable wheels, the members of said nut-and-screw mechanism being of a configuration to preclude rotation relative to one another whereby upon rotation of one of said members, the other member is actuated in a rectilinear direction to thereby effect movement of the steered wheels, hydraulic circuit means including a double-acting servo-cylinder and a control valve including a slide member for controlling flow of hydraulic medium to and from said servo-cylinder, said servo-cylinder being operatively connected to said other member of said nut-and-screw assembly, an element journalled to permit limited movement thereof in said housing circumferentially relative to the axis of one of the members of said screw-and-nut mechanism and operatively connected to the slide member of said control valve, said input shaft journalled in said element, said slide member normally disposed in a neutral position closing flow of pressure medium to said servo-cylinder, rotation of said flexible shaft in one direction effecting rotation of said input shaft relative to said one member and circumferential displacement of said element from said neutral position to permit flow of pressure medium to said servo-cylinder.
Application Number:
JP12560074A
Publication Date:
June 25, 1975
Filing Date:
November 01, 1974
Export Citation:
International Classes:
B62D5/06; B62D5/08; B62D5/22; B62D5/24; F15B9/08; (IPC1-7): B62D5/06