Motor vehicles – Including one or more ski-like or runner members – With at least one surface-engaging propulsion element
Patent
1993-01-08
1994-07-19
Focarino, Margaret A.
Motor vehicles
Including one or more ski-like or runner members
With at least one surface-engaging propulsion element
180132, 180149, B62D 506
Patent
active
053300246
ABSTRACT:
A hydraulic reaction-type steering force control apparatus is provided to improve the sealing performance of a seal ring for preventing liquid leakage from a hydraulic reaction chamber by improving throttling actions in oil passages of chambers before and after the seal ring to prevent the reversal in pressure between the chambers before and after the seal ring. This eliminates a discontinuity phenomenon occurring due to a temporary deficiency of reaction oil pressure during steering operation caused by leakage from the hydraulic reaction chamber. The hydraulic reaction chamber constitutes a hydraulic reaction mechanism supplied with a reaction oil pressure from a hydraulic reaction force control valve mechanism, which is controlled in accordance with vehicle running conditions. A reaction piston has seal members on its slide surfaces and selectively constrains a relative rotational displacement between input and output shafts of a power steering system. First and second low-pressure chambers are allowed to communicate with a tank through their respective throttles. Also, a low-pressure chamber in the hydraulic reaction force control valve mechanism is connected on the upstream side of the throttle at position midway along a connection passage between the first low-pressure chamber and the tank. With this arrangement, the pressure in the hydraulic reaction chamber can be set substantially equal to or higher than the internal pressure in the first low-pressure chamber at any instant limiting the directions of the pressures acting on the seal members of the reaction piston to a predetermined direction constantly.
REFERENCES:
patent: 4787469 (1988-11-01), Yoshida et al.
patent: 4790401 (1988-12-01), Sonoda
patent: 4793433 (1988-12-01), Emori et al.
patent: 4899842 (1990-02-01), Emori et al.
patent: 5135068 (1992-08-01), Emori et al.
Emori Yasuyoshi
Nomura Ikuo
Boehler Anne Marie
Focarino Margaret A.
Jidosha Kiki Co. Ltd.
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