Nine or ten speed split clutch countershaft automatic...

Details Nine or ten speed split clutch countershaft automatic... Nine or ten speed split clutch countershaft automatic...

2007-05-21

2009-10-06

Estremsky, Sherry L (Department: 3655)

Planetary gear transmission systems or components

Nonplanetary variable speed or direction transmission...

Plural power paths to planetary gearing

C475S302000, C074S325000

Reexamination Certificate

active

07597644

ABSTRACT:
A combination countershaft and planetary gear set transmission is provided that achieves at least nine forward speed ratios and two reverse speed ratios. The transmission includes a main shaft operatively driven by a transmission input member as well as first and second countershafts with each countershaft spaced apart from and substantially parallel to the main shaft. The countershafts utilize a split clutch arrangement in which one of the clutches is cantilevered off the countershaft, allowing the size of the countershaft as well as an intermediate support plate to be removed, reducing parts complexity, material and overall length of the transmission.

REFERENCES:
patent: 5445041 (1995-08-01), Zaiser et al.
patent: 7437963 (2008-10-01), Haka et al.
patent: 2007/0068294 (2007-03-01), Buck et al.
patent: 2007/0266810 (2007-11-01), Forsyth
patent: 2008/0000311 (2008-01-01), Baldwin
patent: 2008/0182700 (2008-07-01), Earhart

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