Parking mechanism for a power transmission

Details Parking mechanism for a power transmission Parking mechanism for a power transmission

F - Mech Eng,Light,Heat,Weapons

16

H

F16H 57/10 (2006.01) B60T 1/00 (2006.01) F16H 35/00 (2006.01) F16H 63/48 (2006.01)

Patent

CA 2122461

A countershaft type power transmission has a plurality of selectively engageable friction clutches for establishing a plurality of forward drive ratios and a reverse drive ratio between meshing gear members on an input shaft, a countershaft and an output shaft. One of the power paths established by the meshing gears includes a gear member rotationally fast on the output shaft. A parking pawl member is selectively engageable with this gear member to prevent output shaft rotation when parking is desired. The pawl has teeth formed thereon having a profile which permit continuous simultaneous engagement between two teeth on the pawl and two teeth on the gear member regardless of the rotational bias imposed on the output shaft during parking.

La transmission de type à arbre intermédiaire comprend plusieurs embrayages à friction pouvant être mis en prise sélectivement pour permettre plusieurs rapports d'entraînement de marche avant et un rapport d'entraînement de marche arrière entre les pignons d'engrènement d'un arbre de commande, d'un arbre intermédiaire et d'un arbre de sortie. L'un des chemins de commande établi par les pignons d'engrènement comporte un pignon rapide en rotation sur l'arbre de sortie. On peut sélectivement mettre un cliquet de stationnement en prise avec ce pignon pour empêcher la rotation de l'arbre de sortie lorsqu'on désire l'immobilisation. Le cliquet comporte des dents dont le profil permet une prise simultanée continue entre deux dents du cliquet et deux dents du pignon, quelle que soit la charge rotationnelle imposée à l'arbre de sortie pendant le stationnement.

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