Abstract: A seven-speed powertrain of an automatic transmission includes an input shaft; an output shaft disposed in-parallel with the input shaft; a primary shift portion including a compound planetary gear set having four operational elements and a first simple planetary gear set having three operational elements; a secondary shift portion including a second simple planetary gear set having three operational elements; and a transfer gear device. The operational elements of the primary shift portion are combined by three clutches, two brakes, and one one-way clutch.

Abstract: Six forward speeds and one reverse speed may be realized with minimized length and weight of the transmission by employing two single pinion planetary gear sets and a double pinion planetary gear set. One planetary gear of the double pinion planetary gear set is interconnected with an adjacent second planetary gear of the second single pinion planetary gear set by a common planet carrier such that they may rotate independently, and at the same time, at least two ring gears are integrated so as to enhance strength in the axial direction.

Abstract: A six-speed powertrain of an automatic transmission is formed by combining three simple planetary gear sets, and an output element is realized as a single element without combination with a clutch. Therefore, because a torque load of a respective clutch is reduced, durability may be enhanced and a length of the transmission may be minimized.

Abstract: The present invention provides a six-speed powertrain that includes: a first planetary gearset having operational elements of a first sun gear, a first planet carrier, and a first ring gear; a second planetary gearset having operational elements of a second sun gear, a third sun gear, a second planet carrier, a third planet carrier, and a third ring gear; an input shaft; an output gear; and a transmission case. A first clutch and a second clutch share a common clutch retainer. The first clutch variably connects the third sun gear to the first planet carrier The second clutch variably connects the second sun gear to the first planet carrier.

Abstract: A variable compound planetary gearset forms five operational elements by having its single and double pinion planetary gearsets be interconnected by a shared planet carrier. The variable compound planetary gearset forms six forward speeds and one reverse speeds by receiving input torque through two input routes fixedly or variably connected to a simple planetary gearset and one input route variably connected to an input shaft.

Abstract: A power train of a 7-speed transmission for a vehicle is provided which comprises a first, a second, and a third single-pinion planetary gear set on an input shaft. A first ring gear and a second planetary carrier, a second ring gear and a third planetary carrier, a third ring gear and a first planetary carrier are respectively fixedly connected. A first brake selectively connects a first sun gear to a transmission case, a second sun gear is fixedly connected to the input shaft to operate always as an input element, and a third brake selectively connects a third sun gear to the transmission case.

Abstract: The powertrain includes an arrangement of three single planetary gearsets of which operational elements are wisely interconnected to one another via two clutches and to the transmission via three brakes so as to form six forward speeds and one reverse speed, to be adaptable to a rear wheel drive vehicle.

Abstract: The powertrain includes an arrangement of three single planetary gearsets to form six operational elements, among which a first operational element that always operates as an input element. A second operational element selectively operates as an input element and a stationary element. A third operational element selectively operates as an input element. A fourth operational element selectively operates as a stationary element. A fifth operational element always operates as an output element. A sixth operational element selectively operates as a stationary element.