Patent ID: 8414442
Filing Date: 2013-04-09
Classification: F16H

Abstract:
1. A gear train of a multi-step transmission for a vehicle, comprising: an input shaft and an output shaft disposed parallel to each other; a first planetary gear device disposed to be concentric with the input shaft; a second planetary gear device disposed to be concentric with the output shaft; a pair of first external gears and a pair of second external gears connecting rotational elements of the first planetary gear device to rotational elements of the second planetary gear device in a manner of external gear engagement; a pair of third external gears, a pair of fourth external gears and a pair of fifth external gears connecting a remaining rotational element of the second planetary gear device, which is neither connected to the first external gears nor to the second external gears, to the input shaft in a manner of external gear engagement; a first clutch and a second clutch allowing connection and interruption between the input shaft and two corresponding rotational elements of the first planetary gear device; a third clutch and a fourth clutch each of which is connected in series to at least one of the third external gears, the fourth external gears and the fifth external gears; a fifth clutch provided to fix a rotational element of the first planetary gear device that is connected to the first clutch or one of the rotational elements of the second planetary gear device that is connected to the rotational elements of the first planetary gear device; and a sixth clutch controlling rotation of the remaining rotational element of the second planetary gear device that is neither connected to the first external gears nor to the second external gears.