Abrégé

The driving pulley has a fully clutched mode of operation where a drivebelt and a driveshaft are coupled together in a torque transmitting engagement and also has an unclutched mode of operation where there is substantially no torque transmitting engagement between the drivebelt and the driveshaft. The driving pulley comprises at least one transitional clutch spring that is in a first position when the driving pulley is in the unclutched mode of operation and that is in a second position when the driving pulley is in the fully clutched mode of operation. The at least one transitional clutch spring remains substantially in its second position regardless of the relative axial distance between the sheaves when the driving pulley is in the fully clutched mode of operation. A method of operating a driving pulley is also disclosed. The proposed concept provides a smoother engagement during the transition from the unclutched mode to the fully clutched mode.

Classes IPC  ?

• F16H 55/56 - Poulies ou disques de friction réglables par construction dans lesquelles les éléments porteurs sont réglables axialement les uns par rapport aux autres
• F16H 61/662 - Fonctions internes aux unités de commande pour changements de vitesse ou pour mécanismes d'inversion des transmissions transmettant un mouvement rotatif spécialement adaptées aux transmissions à variation continue du rapport avec des organes flexibles sans fin
• F16H 9/12 - Transmissions pour transmettre un mouvement rotatif à rapport de vitesse variable ou pour inverser un mouvement rotatif par des organes flexibles sans fin sans organes à mouvement orbital utilisant des courroies, des courroies trapézoïdales ou des câbles en prise avec une poulie, constituée de pièces dont les positions sont réglables selon l'axe, dans laquelle la courroie s'engage directement entre les flasques opposés de la poulie sans interposition d'organes de support

Abrégé

The driven pulley is part of a continuously-variable transmission (CVT). The driven pulley comprises two coaxially-disposed sheaves defining between them a belt-receiving groove. It also has at least two axisymmetric ramp surfaces attached to one of the sheaves and at least two axisymmetric followers attached to the other sheave, each ramp surface being engageable by a corresponding one of the followers. At least some of the ramp surfaces are provided on corresponding ramp holders that are independent from the sheaves. A method of modifying the settings of a driven pulley and a method of assembling a driven pulley are also disclosed.

Classes IPC  ?

• F16H 55/52 - Poulies ou disques de friction réglables par construction