Six-speed powertrain of an automatic transmission

Details Six-speed powertrain of an automatic transmission Six-speed powertrain of an automatic transmission

2007-11-06

2007-11-06

Wright, Dirk (Department: 3681)

Planetary gear transmission systems or components

With means to vary drive ratio or disconnect drive

Plural elements selectively braked

Reexamination Certificate

active

11219066

ABSTRACT:
Durability and power transmission efficiency are enhanced in a six-speed powertrain of an automatic transmission by a scheme that includes: a first planetary gear set having operational elements of a first sun gear, a first ring gear, and a first carrier; a second planetary gear set having operational elements of a second sun gear, a second ring gear, and a second carrier; a third planetary gear set having operational elements of a third sun gear, a third ring gear, and a third carrier; an input shaft; at least one output gear; and a transmission case. The first sun gear is fixedly connected to the second sun gear. The second carrier is fixedly connected to the third ring gear. The third sun gear always acts as an input element by being fixedly connected to the input shaft. At lease one operational element of the third carrier and the first ring gear always acts as an output element by being fixedly connected to the at least one output gear. At least one of the fixedly connected first and second sun gears is variably connected to the input shaft via a first clutch. The first carrier is variably connected to the input shaft via a second clutch. The first carrier is variably connected to the transmission case via a first brake and is subject to a stopping operation of the first brake. At lease one of the fixedly connected first and second sun gears is variably connected to the transmission case via a second brake and is subject to a stopping operation of the second brake. The second ring gear is variably connected to the transmission case via a third brake and is subject to a stopping operation of the third brake.

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