Two speed transmission with smooth power shift

Details Two speed transmission with smooth power shift Two speed transmission with smooth power shift

2006-05-16

2006-05-16

Wright, Dirk (Department: 3681)

Planetary gear transmission systems or components

Input from independent power sources

Including electric motor input

Reexamination Certificate

active

07044877

ABSTRACT:
A two speed transmission having an input shaft and an output shaft, the two speed transmission being capable of changing the rotating speed of the output shaft from a first speed ratio to a second speed ratio, the shift between the first rotating speed ratio and the second rotating speed ratio being smoothly accomplished by the present invention's combination of two sets of planetary gear clusters and two electric motors, the electric motors being used to smooth the mechanical shift between the first speed ratio and the second speed ratio.

REFERENCES:
patent: 6371882 (2002-04-01), Casey et al.
patent: 6595884 (2003-07-01), Ai et al.
patent: 6716126 (2004-04-01), Bowen
patent: 2001/0008859 (2001-07-01), Masaki
patent: 1097830 (2001-05-01), None
patent: 1097830 (2004-06-01), None
patent: 2818346 (2000-12-01), None
International Search Report/Written Opinion—PCT/US2004/011844, Oct. 20, 2004.
International Preliminary Report—PCT/US2004/011844, Jul. 12, 2005.

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