Hydrodynamic-mechanical multi-speed compound transmission,...

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

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F16H 47/08 (2006.01) F16H 3/66 (2006.01)

Patent

CA 2322883

The invention relates to a hydrodynamic-mechanical multi-speed compound transmission (i) with at least four speeds. Said transmission comprises a transmission input shaft (E) and a transmission output shaft (A) as well as a hydrodynamic transmission part (2) and a mechanical transmission part (4). The hydrodynamic and the mechanical transmission parts are connected in series when seen from the power flow direction. Means are provided for by-passing the hydrodynamic transmission part (2) during power transmission. The hydrodynamic transmission part (2) comprises at least one hydrodynamic speed-torque converter (3). The mechanical transmission part (4) includes a mechanical speed-torque converting device (5) with at least two planetary gear sets (7, 8). The mechanical transmission part (4) is designed in such a way that transmission ratios in the individual gear steps cause gear step jumps of phi <=1.45 between two successive gear steps of the individual speeds. Various, optionally selective starting variants can be obtained by using different shifting element controls allocated to the theoretically possible speeds. Systematic gear step abandonment provides various gear variations using one gear, resulting in different final arrangements of the speeds.

L'invention concerne une boîte de vitesses compound hydrodynamico-mécanique à plusieurs vitesses (i), comportant au moins 4 vitesses, un arbre primaire (E) et un arbre de sortie (A), une partie hydrodynamique (2) et une partie mécanique (4). Vues dans le sens d'écoulement de puissance, la partie hydrodynamique et la partie mécanique sont montées en série, des éléments étant prévus pour contourner la partie hydrodynamique lors de la transmission de puissance. La partie hydrodynamique (2) comprend au moins un convertisseur vitesse-couple (3) hydrodynamique. La partie mécanique (4) comprend un dispositif mécanique de conversion vitesse-couple (5) avec au moins deux jeux de satellites (7,8). La partie mécanique (4) se présente de manière que les rapports de démultiplication dans les rapports individuels induisent des échelonnements de phi </=1,45 entre deux rapports successifs des étages individuels. Le fait de piloter de manière différenciée les éléments de commande associés aux étages théoriquement possibles permet d'obtenir différentes variantes de démarrage qui peuvent également être sélectionnées. Le fait de renoncer de manière systématique à des rapports permet de parvenir à différentes variantes de rapports pour une boîte de vitesses, ce qui produit des vitesses de différentes conceptions finales.

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