Electrically variable transmission having two planetary gear...

Details Electrically variable transmission having two planetary gear... Electrically variable transmission having two planetary gear...

2007-08-07

2007-08-07

Ho, Ha (Department: 3681)

Planetary gear transmission systems or components

Input from independent power sources

Including electric motor input

Reexamination Certificate

active

11178098

ABSTRACT:
The electrically variable transmission family provides low-content, low-cost electrically variable transmission mechanisms including first and second differential gear sets, a battery, two electric machines serving interchangeably as motors or generators, and two or three selectable torque-transfer devices. The selectable torque transfer devices are engaged singly or in pairs to yield an EVT with a continuously variable range of speeds (including reverse) and at least one mechanically fixed forward speed ratio. The torque transfer devices and the first and second motor/generators are operable to provide five operating modes in the electrically variable transmission, including battery reverse mode, EVT reverse mode, reverse and forward launch modes, continuously variable transmission range mode, and fixed ratio mode.

REFERENCES:
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patent: 5931757 (1999-08-01), Schmidt
patent: 6478705 (2002-11-01), Holmes et al.
patent: 6527658 (2003-03-01), Holmes et al.
patent: 7169074 (2007-01-01), Raghavan et al.
patent: 7192373 (2007-03-01), Bucknor et al.
patent: 2005/0082992 (2005-04-01), Aizawa et al.
patent: 2006/0017414 (2006-01-01), Joe et al.
patent: 2005138802 (2005-06-01), None

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