Continuously variable transmission capable of torque control

Details Continuously variable transmission capable of torque control Continuously variable transmission capable of torque control

F - Mech Eng,Light,Heat,Weapons

16

H

F16H 15/22 (2006.01) F16H 61/662 (2006.01)

Patent

CA 2177383

A continuously-variable-ratio transmission ("CVT") of the band-and-sheave type capable of "torque control", so hat what the operator demands, by movement of the accelerator pedal or other control member, is a particular driving torque applied to the ratio- varying component ("variator"). A connection (21, 22) between at least one of the variator sheaves (3, 4) and its shaft (5) is torque- sensitive, so that torque at that sheave generates an axial force which is a function of the magnitude and direction of the torque to which the sheave is subjected. Examples are described in which the operating axial load, applied to the variator pulley units, comprises two parts -a first part to maintain traction between sheaves and band, and a second part related to the applied torque- and a variator using more than one band.

Transmission variable en continu ("CVT") du type courroie et poulie, pouvant effectuer une "régulation de couple", de manière que la demande d'un opérateur agissant sur la pédale d'accélérateur ou sur d'autres éléments de commande, corresponde à un couple d'entraînement particulier appliqué au composant de variation de rapport ("variateur"). Une liaison (21, 22) entre au moins une des poulies (3, 4) du variateur et son arbre (5) est sensible au couple, de sorte que le couple appliqué à cette poulie génère une force axiale qui est fonction de l'amplitude et de la direction du couple auquel la poulie est soumise. Des exemples sont décrits dans lesquels la force axiale opérante appliquée aux poulies du variateur comprend deux éléments -un premier élément servant à maintenir en tension les poulies et la courroie, et un deuxième élément en relation avec le couple appliqué- ainsi qu'un variateur utilisant plus d'une bande.

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