System for controlling multiple hydraulic pumps in automatic...

F - Mech Eng,Light,Heat,Weapons – 16 – H

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F16H 61/14 (2006.01) F16H 61/00 (2006.01) F16H 59/72 (2006.01)

Patent

CA 2197825

A system for temperature compensating and regulating secondary pressure in a hydraulic circuit for an automatic transmission, includes a viscosity insensitive fixed orifice and a relatively high resistance laminar orifice connected in series relationship between a vent port and a control pressure supplied to a secondary regulated pressure SRP valve. At relatively low temperature, flow through the laminar orifice is negligible; therefore, the steady-state differential pressure across the fixed orifice is negligible. At relatively higher temperatures, flow through the laminar orifice increases. A pressure divider is established and the feedback differential pressure is reduced in proportion to the hydraulic resistance of the two orifices. Flow to friction elements from a primary pump and auxiliary pump and return of fluid to the inlets of the pumps is controlled through a clutch capacity pressure regulator valve acting in cooperation with the SRP valve.

Système de compensation de température et de régulation de pression secondaire dans un circuit hydraulique pour une transmission automatique, comprenant une ouverture invariable et insensible à la viscosité et une ouverture laminaire à résistance relativement haute montées en série entre un évent et une pression d'utilisation fournie à un clapet de refoulement régulé secondaire. € une température relativement basse, l'écoulement à travers l'ouverture laminaire est négligeable; par conséquent, la pression différentielle stable à travers l'ouverture invariable est négligeable. € des températures relativement plus élevées, l'écoulement à travers l'ouverture laminaire augmente. Une division de pression est établie et la pression différentielle de retour est réduite en proportion à la résistance hydraulique des deux ouvertures. L'écoulement aux éléments de frottement à partir d'une pompe primaire et d'une pompe auxiliaire et le retour du fluide aux entrées des pompes sont contrôlés au moyen d'une soupape régulatrice de pression à capacité d'embrayage agissant de concert avec le clapet de refoulement régulé secondaire.

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