| US 7,384,363 B2 | ||
| Six-speed powertrain of automatic transmission | ||
| Hyu Tae Shim, Hwaseong (Korea, Republic of); Ki Been Lim, Yongin (Korea, Republic of); Gyung Cheol Lee, Gunpo (Korea, Republic of); Byeong Ho Soh, Hwaseong (Korea, Republic of); and Kang Soo Seo, Suwon (Korea, Republic of) | ||
| Assigned to Hyundai Motor Company, Seoul (Korea, Republic of) | ||
| Filed on Dec. 15, 2005, as Appl. No. 11/305,689. | ||
| Claims priority of application No. 10-2004-0110553 (KR), filed on Dec. 22, 2004. | ||
| Prior Publication US 2006/0135310 A1, Jun. 22, 2006 | ||
| Int. Cl. F16H 3/62 (2006.01) | ||
| U.S. Cl. 475—275 [475/283] | 40 Claims |
| 1. A six-speed powertrain of an automatic transmission formed by combining a first simple planetary gear set including a first
sun gear, a first ring gear, and a first planet carrier as operational elements thereof, a second simple planetary gear set
including a second sun gear, a second ring gear, and a second planet carrier as operational elements thereof, and a third
simple planetary gear set including a third sun gear, a third ring gear, and a third planet carrier as operational elements
thereof, wherein
the first sun gear is fixedly connected to a transmission case so as to always act as a fixed element,
one of the first planet carrier and the first ring gear is fixedly connected to an input shaft so as to always act as an input
element,
the second sun gear is fixedly connected to the one of the first planet carrier and the first ring gear which is not fixedly
connected to the input shaft,
the second planet carrier and the third planet carrier are fixedly connected to each other,
the third ring gear is variably connected to the second ring gear through a first clutch,
the third sun gear is variably connected to the one which is not fixedly connected to the input shaft of the first planet
carrier and the first ring gear through a second clutch,
the third ring gear is variably connected to the input shaft through a third clutch so as to act as a variable input element,
and is variably connected to the transmission case through a first brake and a one-way clutch disposed in parallel with each
other,
the third sun gear is variably connected to the transmission case through a second brake, and
the third planet carrier acts as an output element.
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