Fluid control valve for a hydraulic system operating with...

F - Mech Eng,Light,Heat,Weapons – 15 – B

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F15B 21/04 (2006.01)

Patent

CA 2172006

Problems such as slow frequency response and low reliability when operating with contaminated fluids of variable viscosity are alleviated in a low pressure hydraulic system (10) which utilizes a single stage electro-hydraulic, clevis-type pressure control valve (40). The valve (40) includes a control piston (106) referenced to a control pressure within a control pressure cavity (60) to provide a feedback of control pressure which converts the valve (40) from an integral to a proportional control device, thereby enhancing stability of the hydraulic system (10). Compensation for changes in fluid viscosity, as a result of changes in fluid temperature is provided by fabricating a bifurcated portion (98) and/or a metering bridge portion (62) of the valve (10) from materials having dissimilar coefficients of thermal expansion. Exemplary embodiments of a hydraulic system (10) suitable for use in either vehicular or stationary applications involving pressure actuated devices such as a clutch (16) automatic transmissions or anti-lock brakes, are provided.

Circuit hydraulique basse pression (10) dans lequel les problèmes de réponse lente et de manque de fiabilité associés à des liquides contaminés de viscosité variable sont atténués grâce à la mise en oeuvre d'un détendeur électro-hydraulique à un étage (40). Le détendeur (40) comporte un piston de commande (106) actionné par la pression régnant dans la cavité (60), de manière à transformer l'action intégrée du détendeur (40) en action proportionnelle et de rehausser ainsi la stabilité du circuit hydraulique (10). Pour compenser les variations de viscosité accompagnant les variations de température du liquide dans le circuit, le détendeur (40) est doté d'une dérivation (98) et/ou d'un pont de mesure (62) en matériaux caractérisés par des coefficients de dilatation thermique différents. Le circuit hydraulique (10) de cette invention peut être utilisé dans des véhicules automobiles ou des installations fixes comportant des organes actionnés par pression, par exemple, des embrayages, des transmissions automatiques ou des freins antiblocages.

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