Motor vehicles – Including one or more ski-like or runner members – With at least one surface-engaging propulsion element
Patent
1988-03-03
1989-08-22
Marmor, Charles A.
Motor vehicles
Including one or more ski-like or runner members
With at least one surface-engaging propulsion element
91375A, B62D 509
Patent
active
048587133
ABSTRACT:
A power-assisted steering system includes a changeover valve unit comprising an input shaft to be rotated by the driver's steering effort applied thereto, an output shaft operatively connected to a hydraulic power cylinder associated with the steering system, a valve assembly for controlling the supply of fluid under pressure from a hydraulic pump to the power cylinder in response to relative rotation between the input and output shafts; and a hydraulic reaction mechanism for applying a reaction force to the input shaft in accordance with a hydraulic reaction pressure applied thereto. The reaction mechanism includes a reaction fluid chamber to be constantly applied with a predetermined small quantity of fluid under pressure and to be applied with a hydraulic pressure caused by relative rotation between the input and output shafts through a throttle. The system is arranged to increase the hydraulic pressure in the reaction fluid chamber in accordance with an increase of travel speed of the vehicle.
REFERENCES:
patent: 4034825 (1977-07-01), Adams
patent: 4606424 (1986-08-01), Hasegawa
patent: 4619339 (1986-10-01), Futaba
patent: 4621704 (1986-11-01), Kozuka
patent: 4632204 (1986-12-01), Itonaga
patent: 4678052 (1987-07-01), Suzuki et al.
Kawakami Hiroshi
Kishida Fumio
Shiratori Harunori
Sugihara Koichi
Watanabe Atsushi
Marmor Charles A.
Toyota Jidosha & Kabushiki Kaisha
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