Multi-speed countershaft transmission with a planetary gear set

Details Multi-speed countershaft transmission with a planetary gear set Multi-speed countershaft transmission with a planetary gear set

2006-07-24

2008-12-30

Le, David D. (Department: 3681)

Planetary gear transmission systems or components

Nonplanetary variable speed or direction transmission...

Plural power paths to planetary gearing

C475S207000, C475S219000, C074S329000, C074S331000

Reexamination Certificate

active

07470206

ABSTRACT:
A transmission is provided that combines first and second countershafts with a planetary gear set, and uses first and second head gear sets to provide ratio. Each of the countershafts supports gears in no more than five co-planar, intermeshing gear sets (and in most embodiments no more than four co-planar, intermeshing gear sets), thus minimizing the overall length of the countershafts. The transmission provides at least nine forward speed ratios and a reverse speed ratio and utilizes only eight torque-transmitting mechanisms.

REFERENCES:
patent: 3654822 (1972-04-01), Singer et al.
patent: RE33126 (1989-12-01), Wittke
patent: 5823051 (1998-10-01), Hall, III
patent: 6387006 (2002-05-01), Jung
patent: 6440032 (2002-08-01), Stauber et al.
patent: 6869379 (2005-03-01), Voss et al.
patent: 7297085 (2007-11-01), Klemen

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