Patent ID: 8197376
Filing Date: 2012-06-12
Classification: F16H

Abstract:
1. A multi-stage transmission of a planetary design for an automatic transmission for a motor vehicle comprising a drive shaft ( 1 ), an output shaft ( 2 ), and four planetary gear sets (P 1 , P 2 , P 3 , P 4 ) being arranged in a housing (G), the multi-stage transmission having a total of eight rotatable shafts ( 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 ) as well as at least six shift elements ( 03 , 04 , 05 , 13 , 28 , 37 ) comprising first, second and third brakes ( 03 , 04 , 05 ) and first, second and third clutches ( 13 , 28 , 37 ) whose selective engagement produces different transmission ratios, between the drive shaft ( 1 ) and the output shaft ( 2 ), for implementing nine forward gears and one reverse gear, wherein the sun gear of the first planetary gear set (P the carrier of the first planetary gear set (P the seventh shaft ( the drive shaft ( the sixth shaft ( the ring gear of the fourth planetary gear set (P the output shaft ( the output shaft (