Multi-speed countershaft transmission with a planetary gear...

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

2007-01-25

2009-10-20

Marmor, Charles A (Department: 3655)

Planetary gear transmission systems or components

Nonplanetary variable speed or direction transmission...

Plural power paths to planetary gearing

C074S331000

Reexamination Certificate

active

07604561

ABSTRACT:
A transmission is provided that combines first and second shaft members in a countershaft configuration with a planetary gear set and first and second head gear sets to provide ratios. Each of the shaft members includes gears in no more than four co-planar, intermeshing gear sets (and in some embodiments no more than three co-planar, intermeshing gear sets) and two sets of radially nested clutches, thus minimizing the overall length of the shaft members. At least one gear concentric with each shaft member is supported by a bearing on the adjacent gear rather than on the shaft member, thereby minimizing the weight of each shaft member. The transmission provides at least seven forward speed ratios and a reverse speed ratio and utilizes at most eight torque-transmitting mechanisms. A method of reducing the length and weight of a transmission package is also provided.

REFERENCES:
patent: 5112283 (1992-05-01), Miyata et al.
patent: 5390560 (1995-02-01), Ordo
patent: 5571058 (1996-11-01), Schmidt
patent: 6387006 (2002-05-01), Jung
patent: 6869379 (2005-03-01), Voss et al.
patent: 7070534 (2006-07-01), Pelouch
patent: 7166049 (2007-01-01), Saller
patent: 7470206 (2008-12-01), Rodgers, II
patent: 2002/0148310 (2002-10-01), Uchino

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