Hydraulic control apparatus for automatic transmission

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

Patent

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Details

F16H 61/04 (2006.01) F16D 48/02 (2006.01) F16H 61/20 (2006.01)

Patent

CA 2559460

To alleviate a shift shock of an automatic transmission provided with a twin clutch. An automatic transmission is provided with gear trains equal in number to the number of speed ratios between a primary shaft SP and a counter shaft SC, and a first hydraulic clutch CL1 and second hydraulic clutch CL2 interrupt and connect the transmission of rotation between a crankshaft SI and the transmission. A changeover valve is provided to connect the pressure of a working fluid to any one of the first and second clutches CL1, CL2. A pair of orifice control valves are disposed between the changeover valve and the first clutch CL1 and between the changeover valve and the second clutch CL2, respectively. A pair of accumulators are disposed between the changeover valve and the first clutch CL1 and between the changeover valve and the second clutch CL2, respectively.

L'invention a pour but d'atténuer le choc d'une transmission automatique grâce à un embrayage double. L'invention concerne une transmission automatique composée de trains d'engrenages en nombre égal à celui des ratios de vitesse entre un arbre primaire SP et un arbre auxiliaire SC; un premier embrayage hydraulique CL1 et un deuxième embrayage hydraulique CL2 interrompent et relient la transmission de la rotation entre un vilebrequin SI et la transmission. On prévoit une valve de changement de régime pour relier la pression d'un fluide de travail à l'un des deux vilebrequins (CL1, CL2). Une paire de valves de contrôle d'orifice sont placées respectivement entre la valve de changement de régime et le premier embrayage CL1 et entre la valve de changement de régime et le deuxième embrayage CL2. Une paire d'accumulateurs se trouvent respectivement entre la valve de changement de régime et le premier embrayage CL1 et entre la valve de changement de régime et le deuxième embrayage CL2.

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