Hydraulic power steering apparatus

Details Hydraulic power steering apparatus Hydraulic power steering apparatus

1989-01-10

1990-09-11

Marmor, Charles A.

Motor vehicles

Including one or more ski-like or runner members

With at least one surface-engaging propulsion element

91434, B62D 508

Patent

active

049554468

ABSTRACT:
A hydraulic power steering apparatus having a hydraulic cylinder as a source for generating a force assisting a steering force, and comprising a directional control valve which switches the feeding direction of pressured oil to the hydraulic cylinder, and a constraining device which constrains its switching operation responsive to the vehicle speed, characterized in that an oil pressure control valve for controlling oil pressure fed to the directional control valve and constraining device is controlled by pressure of a vehicle speed sensor pump which develops oil pressure corresponding to the vehicle speed, and in that a sudden change of a constraining force caused by external disturbance signals such as electromagnetic waves is prevented and the constraining force corresponding to the vehicle speed can be obtained, by introducing oil pressure, which becomes higher or lower responsive to changes of the vehicle speed, into the constraining device to generate the constraining force responsive to the oil pressure.

REFERENCES:
patent: 4000785 (1977-01-01), Nishikawa et al.
patent: 4034825 (1977-07-01), Adams
patent: 4637484 (1987-01-01), Ijiri et al.
patent: 4784235 (1988-11-01), Ijiri et al.
patent: 4840244 (1989-06-01), Broucksou

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