Method for effecting a ratio shift and transmission device...

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

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Details

F16H 61/02 (2006.01) F16H 59/46 (2006.01) F16H 59/14 (2006.01) F16H 59/38 (2006.01)

Patent

CA 2229984

A clutch (18) engaged by means of flyweights (29) and a spring (34) directly meshes an input sun gear (9) and an output planet-wheel carrier (13). If the engagement pressure is insufficient for the torque to be transmitted, the crown wheel (8) slows down and is then stopped by a free wheel (16), while an axial thrust (Pac) produced by the helical teeth releases the clutch (18). The device then functions as a step-down device. To accelerate the procedure, a control unit (152) senses the onset of the slip of the clutch (18) and activates an actuator (44, 46) for releasing the clutch (18) before the forces produced by the teeth occur. In alternative embodiments of the invention, the control unit controls sequential operation forces when two or more clutches must be practically simultaneously actuated. The invention is useful for enhancing the comfort of use and reducing wear and stresses.

Un planétaire d'entrée (9) et un porte-satellites de sortie (13) peuvent être mis en prise directe par un embrayage (18) serré par des masselottes (29) et un ressort (34). Si le serrage est insuffisant pour le couple à transmettre, la couronne (8) ralentit puis est immobilisée par une roue libre (16), tandis qu'une poussée axiale (Pac) due aux dentures hélicoïdales desserre l'embrayage (18). Le dispositif se met alors à fonctionner en réducteur. Pour accélérer ce processus, une unité de pilotage (152) détecte le début du patinage de l'embrayage (18) et active alors un actionneur (44, 46) agissant pour desserrer l'embrayage (18) avant l'apparition des forces de denture. Dans d'autres versions de l'invention, l'unité de pilotage commande des forces de séquencement lorsque au moins deux embrayages doivent être actionnés de manière quasi-simultanée. Utilisation pour améliorer le confort et réduire les contraintes et l'usure.

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