US 9,810,293 B1
Planetary gear train of an automatic transmission for a vehicle
Ki Tae Kim, Incheon (KR); Seong Wook Hwang, Gunpo-si (KR); Hyun Sik Kwon, Seoul (KR); Wonmin Cho, Hwaseong-si (KR); Jae Chang Kook, Hwaseong-si (KR); and Seongwook Ji, Gunpo-si (KR)
Assigned to Hyundai Motor Company, Seoul (KR)
Filed by HYUNDAI MOTOR COMPANY, Seoul (KR)
Filed on Dec. 9, 2016, as Appl. No. 15/374,668.
Claims priority of application No. 10-2016-0132413 (KR), filed on Oct. 12, 2016.
Int. Cl. F16H 3/66 (2006.01)
CPC F16H 3/66 (2013.01) [F16H 2200/0069 (2013.01); F16H 2200/2012 (2013.01); F16H 2200/2046 (2013.01); F16H 2200/2097 (2013.01)] 10 Claims
OG exemplary drawing
 
6. A planetary gear train of an automatic transmission for a vehicle, the planetary gear train comprising:
an input shaft for receiving an engine torque;
an output shaft for outputting a shifted torque;
a first planetary gear set having a first rotational element, a second rotational element, and a third rotational element;
a second planetary gear set having a fourth rotational element, a fifth rotational element, and a sixth rotational element;
a third planetary gear set having a seventh rotational element, an eighth rotational element, and a ninth rotational element; and
a fourth planetary gear set having a tenth rotational element, an eleventh rotational element, and a twelfth rotational element,
wherein:
the input shaft is fixedly connected with the second rotational element,
the output shaft is fixedly connected with the twelfth rotational element,
the second rotational element is fixedly connected with the fifth rotational element and the eleventh rotational element, such that the second, fifth, and eleventh rotational elements always rotate at a same speed,
the eighth rotational element is fixedly connected with the twelfth rotational element, such that the eighth and twelfth rotational elements always rotate at a same speed,
the first rotational element is selectively connected with the seventh rotational element and the ninth rotational element, respectively,
the third rotational element is selectively connected with the seventh rotational element and the tenth rotational element, respectively,
the fourth rotational element is selectively connected with the ninth rotational element, and
the sixth rotational element is fixedly connected with a transmission housing, such that the sixth rotational element is always stationary.