Power steering system

Details Power steering system Power steering system

B - Operations, Transporting

62

D

B62D 5/083 (2006.01) B62D 6/02 (2006.01)

Patent

CA 2175136

A power steering system includes first and second valve members (40 and 42) which are movable relative to each other to port fluid to a vehicle power steering motor (31) and a pump (24) for providing fluid to the first and second valve members (40 and 42) and the power steering motor. A force transmitting member (116) is connected with the first valve member (40) and movable toward and away from the second valve member (42) for applying a force to resist relative movement between the first and second valve members. A fluid pressure chamber (138) receives fluid from the pump (24), the pressure of which acts on the force transmitting member (116). The first and second valve members (40 and 42) include passages for conducting fluid to the fluid pressure chamber (138). A fixed size bleed orifice (182) conducts fluid from the pressure chamber (138) to a reservoir (32). The orifice (182) restricts the flow of fluid from the chamber (138) to the reservoir (32). A variable speed motor (14) which drives the pump (24) varies the flow rate of fluid to the chamber (138) as a function of vehicle speed to vary the pressure in the chamber.

Cette invention concerne une direction assistée qui comprend une première et une seconde soupapes (40, 42) mobiles l'une par rapport à l'autre pour diriger le liquide hydraulique vers un moteur de direction assistée (31) et une pompe (24) destinée à alimenter lesdites première et seconde soupapes (40, 42) ainsi que le dit moteur de direction assistée. Un transmetteur de force (116) raccordé à la première soupape (40) et mobile en direction de la seconde soupape (42) et en sens inverse sert à appliquer une force s'opposant au mouvement relatif des deux dites soupapes. Une chambre de pression (138) reçoit le liquide provenant de la pompe (24), liquide dont la pression agit sur le transmetteur de force (116). Les première et seconde soupapes (40, 42) comportent des passages d'amenée de liquide hydraulique vers la chambre de pression (138). Un orifice de prélèvement à diamètre fixe (182) alimente à débit réduit un réservoir (32) en liquide hydraulique puisé dans la chambre de pression (138). Un moteur à vitesse variable (14) entraînant la pompe (24) fait varier le débit d'alimentation de la chambre de pression (138) en fonction de la vitesse du véhicule et, partant, la pression dans cette chambre.

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