Patent ID: 9625012
Date: 2017-04-18
CPC Classifications: F16H

Claim:
1. An automatic transmission comprising in a transmission case: an input shaft coupled to a power source; a first planetary gear set of a single pinion type including a first sun gear, a first carrier, and a first ring gear; a second planetary gear set of the single pinion type including a second sun gear, a second carrier, and a second ring gear; a third planetary gear set of the single pinion type including a third sun gear, a third carrier, and a third ring gear; a fourth planetary gear set of a double pinion type including a fourth sun gear, a fourth carrier, and a fourth ring gear; five frictional engagement elements; and an output, wherein the first carrier and the second ring gear are always engaged with the input shaft, the first ring gear is always engaged with the third carrier, the second sun gear is always engaged with the third sun gear, the third carrier is always engaged with the fourth sun gear, the second carrier is always engaged with the fourth carrier, the five frictional engagement elements are comprised of: the output is always engaged with the fourth ring gear and driven by the fourth ring gear.