Multi-speed transmission

Details Multi-speed transmission Multi-speed transmission

2011-07-19

2011-07-19

Le, David D (Department: 3655)

Planetary gear transmission systems or components

With means to vary drive ratio or disconnect drive

Plural elements selectively braked

C475S277000, C475S282000

Reexamination Certificate

active

07980986

ABSTRACT:
A multi-speed automatic transmission of a planetary design for a motor vehicle, the transmission comprises an input shaft (AN) and an output shaft (AB); first, second, third and fourth planetary gear sets (RS1, RS2, RS3, RS4); and at least third, fourth, fifth, sixth, seventh and eighth rotatable shafts (3, 4, 5, 6, 7, 8) and 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 eight forward gears and at least one reverse gear can be implemented. When shifting from one forward gear into one of a successive higher and a successive lower forward gear, only a single one of the first, the second, the third, the fourth and the fifth shift elements is disengaged and only a single one of the first, the second, the third, the fourth and the fifth shift elements is engaged.

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