Variable speed transmission and transaxle

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

Patent

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Details

F16H 47/08 (2006.01) B60K 17/06 (2006.01) F16H 3/72 (2006.01) B60K 5/00 (2006.01)

Patent

CA 2211625

A variable speed transmission or transaxle that utilizes a pump for variable braking of the output shaft or axle. A rotatable input shaft connectable to a drive source extends into a transmission housing and is operatively connected to a gear train that transmits rotational power to a transmission output shaft. A gerotor pump mounted within the housing utilizes a ring gear of an epicyclic gear of the gear train as an inner gerotor gear that meshes with an outer gerotor gear to pump fluid along a fluid conduit. By adjustably varying the resistance of the pump, the revolution rate of the epicyclic ring gear is adjusted which in turn results in a controlling of the speed of rotation of the transmission output shaft. In an alternate embodiment, a reversible transmission is provided by employing two gerotor pumps and two gear trains which allow forward and reverse speeds of rotation of the output shaft to be variably controlled.

Transmission à vitesse variable ou boîte-pont utilisant une pompe pour le freinage variable de l'arbre secondaire ou de l'essieu. Un arbre primaire relié à la source motrice se prolongeant jusqu'à l'intérieur du carter d'embrayage est en engrenage avec un train planétaire qui transmet son mouvement de rotation à un arbre secondaire. Une pompe à rotor denté montée à l'intérieur du carter utilise la couronne d'un train planétaire comme denture intérieure en engrenage avec la denture extérieure de la pompe à rotor denté pour le pompage du liquide dans une canalisation hydraulique. Le réglage de la résistance offerte par la pompe fait varier la vitesse de rotation de la couronne qui, à son tour, modifie la vitesse de rotation de l'arbre secondaire. Dans une autre version de l'invention, l'utilisation de deux pompes à rotor denté en association avec deux trains planétaires permet le contrôle variable des mouvements de rotation dans les deux sens.

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