Power assistance steering system for use in a vehicle
AssigneeMando Machinery Corporation
InventorsByoung-Yoon Choi, Won-Taek Choi, Je-Tae Yoo
Life of this patent
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Abstract
A power assistance steering system for use in a vehicle comprises a restricting mechanism including a cylindrical reaction piston having a reaction surface on which said reaction pressure is applied in order to cause said reaction piston to be biased downwardly, and at least one reversed V-shaped depression formed on a bottom skirt, the cylindrical reaction piston adapted to be held on the input shaft in such a way that said reaction piston can longitudinally and slidably reciprocate with respect to the input shaft, while circumferentially locked to the input shaft, and at least one semi-spherical protrusion formed on a middle end surface of said output shaft so as to be retained within the reversed V-shaped depression.
Claims10
A power assistance steering system for use in a vehicle, including an input shaft connected to a steering wheel, an output shaft connected to a pair of driving wheels, a rotary valve, a reaction pressure control valve for generating a reaction pressure proportional to a vehicle speed and a restricting mechanism for controlling a hydraulic power assistance according to the reaction pressure, characterized in that the restricting mechanism comprises:
- a cylindrical reaction piston having a reaction surface on which the reaction pressure is applied in order to cause the reaction piston to be biased downward, and at least one reversed V-shaped depression formed on a bottom skirt;
- means for supporting the reaction piston on the input shaft in such a way that the reaction piston is allowed to move vertically with respect to the input shaft, while circumferentially locked to the input shaft;
- and
- at least one semi-spherical protrusion formed on a middle end surface of the output shaft so as to be retained within the reversed V-shaped depression.
Dependencies are inferred from the claim text.