Control valve for a hydraulic power steering system

Details Control valve for a hydraulic power steering system Control valve for a hydraulic power steering system

B - Operations, Transporting

62

D

B62D 5/083 (2006.01)

Patent

CA 2560190

A control valve for a hydraulic power steering system includes a pair of flow circuits arranged in parallel. Each flow circuit includes an upstream and downstream flow orifices arranged in series. Each set of orifices defines between the orifices an intermediate pressure zone of the valve. Both orifices close together from a centered condition of the valve and fully close substantially together at a fully closed condition of the valve. The downstream orifice is larger than the upstream orifice when open to minimize the likelihood of cavitation and noise. An equalization passage fluidly connects both intermediate pressure zones to equalize pressure despite variations in orifice size due to manufacturing tolerances. The control valve includes a bypass passage in parallel with the flow circuits. A pressure relief valve in the control valve has a normally closed valving member in the bypass passage that opens the valve in the event of overpressure.

L'invention concerne une soupape de commande pour système de direction assistée hydraulique comprenant une paire de circuits d'écoulement montés en parallèle. Chaque circuit d'écoulement comprend des orifices d'écoulement amont et aval agencés en séries. Chaque ensemble d'orifices définit entre lesdits orifices une zone de pression intermédiaire de la soupape. Lors d'un déplacement de la soupape, deux orifices ferment ensemble à partir d'un état centré et ferment complètement sensiblement ensemble afin d'obtenir un état complètement fermé de cette soupape. L'orifice aval est plus grand que l'orifice amont lorsqu'il est ouvert afin de limiter l'éventualité d'une cavitation ou d'un bruit. Un passage d'égalisation connecte de manière fluidique deux zones de pression intermédiaire afin d'égaliser une pression en dépit des variations de taille d'orifice dues à des tolérances de fabrication. La soupape de commande comprend un passage de dérivation parallèle aux circuits d'écoulement. Une soupape de libération de pression dans la soupape de commande comprend un élément de soupape normalement fermé dans passage de dérivation qui ouvre la soupape en cas de surpression.

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