Planetary gear train of automatic transmission for vehicles
AssigneeHyundai Motor Company
InventorsWonmin Cho, Kangsoo Seo, Seongwook Hwang, Jaechang Kook, Seongwook Ji, Myeonghoon Noh
Life of this patent
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Abstract
A planetary gear train of an auto transmission for a vehicle may include an input shaft, four planetary gear sets, eight rotational shafts and six friction elements. The rotational shafts connect rotation elements of corresponding first, second, third, and/or fourth planetary gear sets, and one or more rotational shafts are directly or selectively connected to an output shaft or a transmission housing. The six friction elements selectively connect the rotational shafts and selectively connect one or more rotational shafts with the transmission housing.
Claims5
A planetary gear train of an auto transmission for a vehicle, comprising:
- an input shaft into which power of an engine is input;
- a first planetary gear set including a first sun gear, a first planetary carrier, and a first ring gear;
- a second planetary gear set including a second sun gear, a second planetary carrier, and a second ring gear;
- a third planetary gear set including a third sun gear, a third planetary carrier, and a third ring gear;
- a fourth planetary gear set including a fourth sun gear, a fourth planetary carrier, and a fourth ring gear;
- a first rotational shaft configured to connect the first and second sun gears and selectively connected to a transmission housing;
- a second rotational shaft configured to connect the first and third planetary carriers and the fourth ring gear;
- a third rotational shaft configured to connect the first ring gear and selectively connected to the transmission housing;
- a fourth rotational shaft configured to connect the second planetary carrier and directly connected to an input shaft;
- a fifth rotational shaft configured to connect the second ring gear and the third sun gear;
- a sixth rotational shaft configured to connect the third ring gear;
- a seventh rotational shaft configured to connect the fourth sun gear, and selectively connected with the input shaft and selectively connected to the fifth and sixth rotational shafts;
- an eighth rotational shaft configured to connect the fourth planetary carrier and directly connected with an output shaft and selectively connected with the sixth rotational shaft;
- and
- six friction elements selectively connecting the rotational shafts and selectively connecting the first and third rotational shafts with the transmission housing.
Dependencies are inferred from the claim text.