Vehicle transmission

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

Patent

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F16H 3/083 (2006.01)

Patent

CA 2621613

To prevent an increase in the diameter of a shift drum and eliminate the significant change of the shape of a lead groove even if the number of shift positions set on the shift drum is increased. A shift drum is provided on the outer circumference thereof with at least one particular lead groove among lead grooves which continuously extends beyond one circle of the shift drum and with both ends of the second lead groove which are arranged so as to be out of alignment with each other in the axial direction of the shift drum. A common shift position adapted to establish gear trains with two shift stages different from each other is set at one position corresponding to both the ends of the particular lead groove along the circumferential direction of the shift drum.

Conception qui permet d'éviter l'augmentation du diamètre d'un tambour de changement de vitesse ainsi que la déformation significative de la cannelure de tête, même si le nombre de positions de changement de vitesse déterminé pour le tambour est augmenté. Un tambour de changement de vitesse entoure complètement la circonférence extérieure de la transmission de sorte qu'au moins une cannelure de tête précise parmi toutes les cannelures de tête se prolonge au-delà d'un cercle du tambour de changement de vitesse, et que les deux extrémités de la deuxième cannelure de tête soient disposées de façon à être décalées l'une par rapport à l'autre dans la direction axiale du tambour de changement de vitesse. Une position de changement de vitesse commune, prévue pour permettre aux trains d'engrenages de disposer de deux plages de changement de vitesse différentes, est déterminée, qui correspond aux deux extrémités de la cannelure de tête pratiquée le long de la circonférence du tambour de changement de vitesse.

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