Patent ID: 7192377

Claim:
A six-speed powertrain of an automatic transmission for a vehicle, comprising: a first planetary gearset of a single pinion planetary gearset having a first sun gear, a first planet carrier, and a first ring gear; a second planetary gearset of a single pinion planetary gearset having a second sun gear, a second planet carrier, and a second ring gear; and a third planetary gearset of a single pinion planetary gearset having a third sun gear, a third planet carrier, and a third ring gear, wherein the first ring gear and the second planet carrier, the second ring gear and the third planet carrier, and the third ring gear and the first planet carrier are fixedly interconnected respectively such that the combination of the first, second, and third planetary gearsets forms six operational elements, a first operational element that always operates as an input element, a second operational element that selectively operates as an input element and a stationary element, a third operational element that selectively operates as an input element, a fourth operational element that selectively operates as a stationary element, a fifth operational element that always operates as an output element, and a sixth operational element that selectively operates as a stationary element; wherein: the first operational element corresponds to the second sun gear; the second operational element corresponds to the third sun gear; the third operational element corresponds to the first ring gear and the second planet carrier; the fourth operational element corresponds to the second ring gear and the third planet carrier; the fifth operational element corresponds to the first planet carrier and the third ring gear; and the sixth operational element corresponds to the first sun gear.