Full-time transfer case with synchronized range shift and...

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

Patent

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F16H 37/08 (2006.01) F16H 3/44 (2006.01) F16H 48/02 (2006.01)

Patent

CA 2465346

A full-time two-speed transfer case (20) is equipped with an integrated planetary gearset assembly (42') and a range shift mechanism (86') to provide high-range and low-range drive connections. The integrated planetary gearset assembly (42') includes a first gearset (48') which acts as a two-speed reduction unit and a second gearset (50) which acts as an interaxle differential. The synchronized range shift mechanism (86') is arranged to concurrently move two components (68', 70') of the first gearset (48) and can be synchronized to permit on-the-move range shifts. The transfer case (20) is also equipped with a dual-mode bi-directional overrunning clutch and a mode shift mechanism to establish automatic full-time and locked four-wheel drive modes.

L'invention porte sur une boîte de transfert intégrale permanente à deux rapports équipée d'un train planétaire intégré et d'un mécanisme de changement de vitesse. Le train planétaire intégré se subdivise en un premier train constituant la boîte à deux rapports et en un deuxième train constituant le différentiel inter-essieux. Le mécanisme de changement de vitesse qui déplace ensemble deux de ses éléments peut être synchronisé pour permettre le passage des vitesses en marche. La boîte de transfert est par ailleurs équipée d'un embrayage de surmultipliée bidirectionnel et d'un mécanisme de changement de mode permettant de passer du régime permanent au régime de transmission intégrale à blocage du différentiel sur les 4 roues.

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