Eight-speed transmissions with four planetary gear sets

Details Eight-speed transmissions with four planetary gear sets Eight-speed transmissions with four planetary gear sets

2007-01-16

2007-01-16

Estremsky, Sherry (Department: 3681)

Planetary gear transmission systems or components

With means to vary drive ratio or disconnect drive

Plural elements selectively braked

C475S288000

Reexamination Certificate

active

11041635

ABSTRACT:
Eight-speed transmissions are provided that include four planetary gear sets having seven torque-transmitting mechanisms and various fixed interconnections to provide eight forward speed ratios and at least one reverse speed ratio. 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 of the planetary gear members. The seven torque-transmitting mechanisms are operated in combinations of two. Reduced component speeds and improved ratios are achieved.

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