Six-speed powertrain of an automatic transmission
AssigneeHyundai Motor Company
InventorsHyu Shim, Ki Lim, Gyung Lee, Byeong Soh, Kang Seo
Life of this patent
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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.
Claims58
A six-speed powertrain of an automatic transmission, comprising:
- first and second single pinion planetary gear sets and a double pinion planetary gear set;
- and
- two clutches and three brakes acting thereon to form six forward speeds and one reverse speed, wherein
- 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;
- a ring gear of the double pinion planetary gear set and a ring gear of the first single pinion planetary gear set are fixedly connected together;
- a ring gear of the second single pinion planetary gear set and a planet carrier of the first single pinion planetary gear set are fixedly interconnected;
- and
- a sun gear of the double pinion planetary gear set always receives a torque from the input shaft.
A six-speed powertrain of an automatic transmission, comprising:
- a first single pinion planetary gear set including a first sun gear, a first planetary gear, and a first ring gear;
- a second single pinion planetary gear set including a second sun gear, a second planetary gear, and a second ring gear;
- and
- a double pinion planetary gear set including a third sun gear, a pair of third planetary gears, and a third ring gear, wherein:
- one third planetary gear of the pair of third planetary gears is interconnected with an adjacent second planetary gear by a common planet carrier such that they may rotate independently;
- the third ring gear and the first ring gear are fixedly connected together;
- the second ring gear and the first planet carrier are fixedly connected;
- and
- the third sun gear is fixedly connected with the input shaft so as to always receive a torque therefrom;
- at least two clutches and three brakes coordinate with said gear sets to realize six forward speeds and one reverse speed.
Dependencies are inferred from the claim text.