BigPatents India

a six-speed powertrain of the prior art has many factors to be improved. The present invention a six-speed powertrain having stability and durability by having a small number of frictional elements. A first planetary gear set having operational elements of a first sun gear, a first ring gear, and a first carrier; a second planetary gear set having operatinal elements of a second sun gear, a second ring gear, and a second carrier; a third planetary gear set having operational elements of a third sun gear, a third ring gear, and a third carrier; a fourth planetary gear set haaving operational elements of a fourth sun gear, a fourth ring gear, and a fourth carrier; an input shaft; an output gear; and a transmission case