Patent ID: 7980986
Filing Date: 2011-07-19
Classification: F16H

Abstract:
1. A multi-speed automatic transmission of a planetary design for a motor vehicle, the transmission comprising: an input shaft (AN, only first, second, third and fourth planetary gear sets (RS only first, second, third, fourth and fifth shifting elements (A, B, C, D, E) whose selective engagement defines different gear ratios between the input shaft (AN) and the output shaft (AB) such that first, second, third, fourth, fifth, sixth, seventh and eight forward gears and at least one reverse gear can be implemented; for each of the first, the second, the third, the fourth, the fifth, the sixth, the seventh and the eight forward gear and at least one reverse gear, three of the first, the second, the third, the fourth and the fifth shifting elements (A, B, C, D, E) are engaged while a remaining two of the first, the second, the third, the fourth and the fifth shifting elements (A, B, C, D, E) are disengaged; and when shifting from a forward gear to one of a successive higher and a successive lower forward gear, a single engaged one of the first, the second, the third, the fourth and the fifth shift elements is disengaged and a single disengaged one of the first, the second, the third, the fourth and the fifth shift elements is engaged.