主权项 |
1. An automatic transmission in which a plurality of planetary gear mechanisms disposed on an axis of an input shaft are housed in a transmission case and a predetermined gear is established by controlling a coupling relationship among elements of the plurality of planetary gear mechanisms, the input shaft, and the transmission case by using a plurality of clutches and a plurality of brakes, wherein
the automatic transmission comprises, as said plurality of planetary gear mechanisms: a planetary gear mechanism A including a sun gear unrotatable relative to the input shaft; a planetary gear mechanism B disposed adjacent to the planetary gear mechanism A, in which elements are rotatable relative to each other; and a planetary gear mechanism C disposed on an opposite side to the planetary gear mechanism B with the planetary gear mechanism A interposed therebetween, in which elements are rotatable relative to each other, the automatic transmission further comprises: as one of said clutches, a clutch A capable of coupling a ring gear of the planetary gear mechanism C to the input shaft; a thrust bearing A disposed between the sun gear of the planetary gear mechanism A and a sun gear of the planetary gear mechanism B; and a thrust bearing B disposed between a clutch hub of the clutch A and the transmission case. |