Multiple-speed automatic transmission

Details Multiple-speed automatic transmission Multiple-speed automatic transmission

2007-11-13

2007-11-13

Marmor, Charles A. (Department: 3681)

Planetary gear transmission systems or components

With means to vary drive ratio or disconnect drive

Plural drive ratios other than unity

C475S271000

Reexamination Certificate

active

11203693

ABSTRACT:
An automatic transmission includes a first power path producing a first ratio of a speed of the input and a speed of a first power path output; a second power path producing a second ratio of a speed of the input and a speed of the second power path output, the second ratio being is less than the first ratio; a double planetary gear unit including first, second, third and fourth members, the second member being secured to the output; a first clutch being operable to connect the first member to the input through the first power path; a second clutch being operable to connect the fourth member to the input through the first power path; a third clutch being operable to connect the third member carrier to the input through the second power path; a fourth clutch being operable to connect the fourth member to the input through the second power path; a first brake being operable to hold the fourth member against rotation; and a second brake being operable to hold the third member against rotation.

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