Eight speed transmissions with three planetary gear sets

Details Eight speed transmissions with three planetary gear sets Eight speed transmissions with three planetary gear sets

2005-12-20

2005-12-20

Lewis, Tisha (Department: 3681)

Planetary gear transmission systems or components

With means to vary drive ratio or disconnect drive

Plural drive ratios other than unity

C475S276000, C475S277000, C475S278000, C475S280000, C475S288000, C475S330000

Reexamination Certificate

active

06976931

ABSTRACT:
The family of transmissions has a plurality of members that can be utilized in powertrains to provide at least eight forward speed ratios and one reverse speed ratio. The transmission family members include three planetary gear sets having seven torque-transmitting mechanisms and three fixed interconnections. The powertrain includes an engine and torque converter that is continuously connected to at least one of the planetary gear members and an output member that is continuously connected with another one of the planetary gear members. The seven torque-transmitting mechanisms provide interconnections between various gear members and the transmission housing, and are operated in combinations of two to establish at least eight forward speed ratios and at least one reverse speed ratio.

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