Ratio limiting arrangement

Details Ratio limiting arrangement Ratio limiting arrangement

F - Mech Eng,Light,Heat,Weapons

16

H

F16H 37/08 (2006.01)

Patent

CA 2608545

An arrangement is disclosed for providing an "end-stop" function for a variator in a continuously variable transmission. The variator (8) needs some arrangement for preventing its own drive ratio from going beyond a ratio limit. In accordance with the present invention, this is provided by means of a one-way clutch (22 or 24). The one-way clutch is coupled to both the variators input and its output, and is arranged to engage (lock up) when the variator reaches its ratio limit, so that the variator is prevented from going beyond the limits. The invention is particularly suited to use with transmissions which provide two regimes and a synchronous change between them.

La présente invention concerne un arrangement offrant à un variateur une fonction "fin-arrêt" dans le cadre d~une transmission continuellement variable. Le variateur (8) a besoin d~un certain arrangement pour empêcher son propre rapport d~entraînement de descendre en dessous d~une limite de rapport. Selon l~invention, un embrayage à roue libre (22 ou 24) joue ce rôle. L~embrayage à roue libre est couplé à la fois à l~entrée et à la sortie du variateur, et il est disposé de manière à s~engager (se verrouiller) lorsque le variateur atteint sa limite de rapport, empêchant ainsi le variateur de dépasser les limites. L~invention est tout particulièrement conçue pour être utilisée avec des transmissions qui offrent deux régimes et un changement synchrone entre les deux.

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