Patent ID: 8771130
Filing Date: 2014-07-08
Classification: F16H

Abstract:
1. An automatic transmission, comprising: an input shaft that is drivingly coupled to a drive source; a reduction planetary gear that has a first sun gear, a first carrier, and a first ring gear, and that can output decelerated rotation decelerated from input rotation of the input shaft; a planetary gear set that has a second sun gear, a third sun gear, a second carrier supporting a short pinion meshing with the third sun gear and a stepped pinion having a small diameter portion meshing with the short pinion and a large diameter portion meshing with the second sun gear such that the short pinion and the stepped pinion are rotatable, a second ring gear meshing with the large diameter portion, and a third ring gear meshing with the small diameter portion; a first clutch capable of inputting the decelerated rotation of the reduction planetary gear to the third sun gear; a second clutch capable of inputting the input rotation of the input shaft to the third ring gear; a third clutch capable of inputting the decelerated rotation of the reduction planetary gear to the second sun gear; a fourth clutch capable of inputting the input rotation of the input shaft to the second carrier; a first brake capable of preventing the second sun gear from rotating; a second brake capable of preventing the second carrier from rotating; a third brake capable of preventing the third ring gear from rotating; and an output member drivingly coupled to the second ring gear, wherein the automatic transmission is configured to achieve at least ten forward speeds and one reverse speed.