Driven pulley

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

Patent

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Details

F16H 61/00 (2006.01) F16H 55/56 (2006.01) F16H 61/662 (2006.01)

Patent

CA 2389965

The driven pulley (10) is used in a continuously variable transmission (CVT). It is coaxially mountable around a main shaft (12) and comprises two opposite conical flanges, namely a first flange (14) and a second flange (18), which face each other. An annular cam plate (40) is coaxially connected to the side of the second flange (18) that is opposite the first flange (14). The cam plate (40) comprises at least two inclined first cam surfaces (42) and at least two inclined second cam surfaces (44) having an inverted inclination with reference to the first cam surfaces (42). A first radially-extending support (50) bears a set of first cam followers (54). The first support (50) is at a fixed axial distance from the first flange (14) and each first cam follower (54) is engaged with a respective one of the first cam surfaces (42). Similarly, a second radially-extending support (60) bears a set of second cam followers (64). The second support (60) is also at a fixed axial distance from the first flange (14) and each second cam follower (64) is engaged with a respective one of the second cam surfaces (44). Spiral springs (70) are mounted between the first support (50) and the second support (60). This driven pulley (10) allows a control of the return force of the springs (70) and maintains a, good gripping force on the drivebelt (24) even when subjected to a reverse torque.

L'invention concerne une poulie entraînée (10) s'utilisant dans une transmission à changement de vitesses continu. Cette poulie peut être montée coaxialement autour d'un arbre principal (12) et possède deux rebords coniques opposés, à savoir un premier rebord (14) et un second rebord (18) disposés face à face. Un disque à cames annulaire (40) est relié de manière coaxiale au côté du second rebord (18) opposé au premier (14). Ce disque (40) comporte au moins deux premières surfaces de came inclinées (42) et au moins deux secondes surfaces de came inclinées (44) ayant une inclinaison opposée à celle desdits premières surfaces (42). Un premier support (50) s'étendant radialement soutient un ensemble de premiers galets de came (54). Ce premier support (50) se trouve à une distance axiale fixe du premier rebord (14), chacun desdits galets de came (54) entrant en prise avec une première surface de came (42) correspondante. D'une façon similaire, un second support (60) s'étendant radialement soutient un ensemble de seconds galets de came (64). Ce second support (50) se trouve également à une distance axiale fixe du premier rebord (14), chacun desdits galets de came (64) entrant en prise avec une des secondes surfaces de came (44) correspondante. Des ressorts spiralés (70) sont montés entre le premier (50) et le second support (60). La poulie entraînée (10) de l'invention permet de commander la force de rappel des ressorts (70) et de maintenir une bonne force de préhension sur la courroie d'entraînement (24) même lorsqu'elle est soumise à un couple inverse.

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