Patent ID: 8328679
Filing Date: 2012-12-11
Classification: F16H

Abstract:
1. A gear train of an automatic transmission for vehicles comprising a first planetary gear set being a simple planetary gear set having first, second, and third rotational elements, a second planetary gear set being a simple planetary gear set having fourth, fifth and sixth rotational elements, and a third planetary gear set being a compound planetary gear set having seventh, eighth, ninth and tenth rotational elements, wherein the first rotational element is continuously connected to an input shaft and always operated as an input element, the second rotational element is selectively connected to the fifth rotational element of the second planetary gear set, and the third rotational element is continuously connected to the fourth rotational element of the second planetary gear set, wherein the fourth rotational element is continuously connected to the eighth rotational element, the fifth rotational element is selectively connected respectively to a transmission housing and the input shaft, and the sixth rotational element is continuously connected to an output gear so as to be always operated as an output element, and wherein the seventh rotational element is continuously connected to the input shaft, the eighth rotational element is selectively connected to the transmission housing, and the ninth and the tenth rotational elements are selectively connected to the transmission housing respectively, wherein the second rotational element is selectively connected to the fifth rotational element via a first clutch, the fifth rotational element is selectively connected to the input shaft via a second clutch and is selectively connected to the transmission housing via a first brake, the eighth rotational element is selectively connected to the transmission housing via a second brake, the tenth rotational element is selectively connected to the transmission housing via a third brake, and the ninth rotational element is selectively connected to the transmission housing via a fourth brake, and wherein the first and second clutches and the first brake are disposed at a front portion of the first planetary gear set, and the second, third, and fourth brakes are disposed at a rear portion of an external circumference of the third planetary gear set.