Transfer construction

B - Operations – Transporting – 60 – K

Patent

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Details

B60K 17/35 (2006.01) B60K 17/346 (2006.01) B60K 23/08 (2006.01)

Patent

CA 2156187

A transfer construction for a four-wheel drive vehicle in which a driving force inputted from an input member (4) is distributed to a primary output member (5) and a secondary output member (6) via respective constituent elements of a compound planetary gear mechanism (18) for transfer to a front wheel side rotating member and rear wheel side rotating member. The compound planetary gear mechanism (18) comprises a ring gear (19), a primary sun gear (22), a primary pinion gear (20) in meshing engagement with said ring gear (19), a secondary pinion gear (21) in mesh engagement with said primary pinion gear (20) and said primary sun gear (22), a secondary sun gear (23) in mesh engagement with said primary pinion gear (20), and a carrier (24) for rotatably supporting said primary and secondary pinion gears (21), wherein, for instance, said ring gear (19) and said input member (4) are coupled to each other, wherein an engagement member (29, 28, 33) such as a wet-type multi- plate clutch is interposed, respectively, between said primary sun gear (22) and said primary output member (5), said secondary sun gear (23) and a stationary member (27), and said supporting carrier (24) and said secondary output member (6), whereby driving force distribution to said primary output member (5) and said secondary output member (6) is controlled by adjusting the engagement conditions of said engagement members (29, 28, 33), thereby making it possible to integrate the functions of a sub-transmission and a center differential into one construction, this not only making a transfer portion smaller and lighter but also making it easy to switch between various driving force distribution conditions.

L'invention concerne un système de transfert pour un véhicule à quatre roues motrices dans lequel une force motrice admise par un élément d'entrée (4) est distribuée à un élément de sortie primaire (5) et un élément de sortie secondaire (6) par l'intermédiaire d'éléments constitutifs respectifs d'un engrenage planétaire (18) avant d'être transférée vers un élément rotatif latéral de la roue avant et un élément rotatif latéral de la roue arrière. L'engrenage planétaire (18) comprend une couronne dentée (19), un pignon planétaire primaire (22), un pignon primaire (20) engrené avec la couronne dentée (19), un pignon secondaire (21) engrené avec le pignon primaire (20) et le pignon planétaire primaire (22), un pignon planétaire secondaire (23) engrené avec le pignon primaire (20), et un support (24) sur lequel sont montés pivotants le pignon primaire (20) et le pignon secondaire (21). Dans cet engrenage planétaire, le pignon (19) et l'élément d'entrée (4), par exemple, sont accouplés; un élément d'engrenage (29, 28, 33) du type embrayage multidisque humide est intercalé, respectivement entre le pignon planétaire primaire (22) et l'élément de sortie primaire (5), le pignon planétaire secondaire (23) et un élément fixe (27), le support (24) et l'élément de sortie secondaire (6). La distribution de la force motrice à l'élément de sortie primaire (5) et à l'élément de sortie secondaire (6) est contrôlée par un réglage des conditions d'engrenage des éléments d'engrenage (29, 28, 33), ce qui permet d'intégrer les fonctions d'une sous-transmission et d'un différentiel central dans un seul système, et par conséquent non seulement de réduire et d'alléger la zone de transfert, mais aussi de faciliter le passage entre les différentes conditions de distribution de la force motrice.

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