9-speed transmission

Details 9-speed transmission 9-speed transmission

2011-05-24

2011-05-24

Pang, Roger L (Department: 3655)

Planetary gear transmission systems or components

With means to vary drive ratio or disconnect drive

Plural elements selectively braked

C475S275000

Reexamination Certificate

active

07946948

ABSTRACT:
The transmission has a plurality of members that can be utilized in powertrains to provide nine forward speed ratios and one reverse speed ratio. The transmission includes four planetary gear sets having six torque-transmitting devices and four 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 six torque-transmitting devices provide interconnections between various gear members, the transmission housing and with the input member, and are operated in combinations to establish at least nine forward speed ratios and at least one reverse speed ratio.

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