Hydraulic power steering system

B - Operations – Transporting – 62 – D

Patent

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Details

B62D 5/09 (2006.01)

Patent

CA 2556318

The invention relates to a hydraulic power assisted steering system (1) for a vehicle, in particular an electrohydraulic power assisted steering system for a motor vehicle. Said hydraulic power assisted steering wheel comprises a servo valve (2) and the relative movement thereof actuates control parts thereof of a piston rod (3) of a servocylinder (4) and modifies at least one steering angle (.beta.) of a wheel (5) which co-operates with the piston rod (3). The power assisted steering system (1) also comprises an electric servomotor (6) which drives a rod (7) which is used to adjust the steering angle of the wheel (5) in the same direction as the servocylinder (4). The aim of the invention is to produce an electrohydraulic power assisted steering system (1) which is compact as possible in the region of the actuator and which can be used in a flexible manner for different vehicle classes. According to the invention, the rod (7) and the piston rod (3) of the servocylinder (4) are arranged in a parallel manner in relation to each other and interact with each other on an additional element (8) for adjusting the common steering angle of the wheel (5).

L'invention concerne une direction assistée hydraulique (1) pour un véhicule, notamment une direction assistée électrohydraulique pour un véhicule automobile. La direction assistée hydraulique selon l'invention comprend une servosoupape (2) munie d'éléments de commande dont le déplacement relatif actionne une tige de piston (3) d'un servocylindre (4) et modifie au moins un angle de braquage ( beta ) d'une roue (5) coopérant avec la tige de piston (3). La direction assistée hydraulique (1) selon l'invention comprend également un servomoteur électrique (6) qui entraîne une tige (7) pour l'ajustage de l'angle de braquage de la roue (5) dans le même sens que le servocylindre (4). L'invention vise à créer une direction assistée électrohydraulique de faible encombrement notamment au niveau de son actionneur et qui puisse être utilisée de manière souple pour différentes classes de véhicules. A cet effet, la tige (7) et la tige de piston (3) du servocylindre (4) sont placées parallèlement l'une à l'autre et agissent par liaison active sur un élément d'addition (8) pour l'ajustage commun de l'angle de braquage de la roue (5).

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