Semi-power split hybrid transmission with multiple modes and fixed gears
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United States of America Patent
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Jun 18, 2013
Grant Date -
Nov 5, 2009
app pub date -
May 2, 2008
filing date -
May 2, 2008
priority date (Note) -
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Abstract
The present disclosure provides a semi-power split transmission with multiple Electric Variable Transmission (EVT) modes and fixed gears for use in hybrid electrical vehicles (HEV). The present disclosure utilizes two electric motors (“E-motors”), an engine, and two planetary gear sets. The planetary gear sets can include a dual-sun Ravigneaux-type gear set (DS-RGS), a dual-ring Ravigneaux-type gear set (DR-RGS), a three-sun Ravigneaux-type gear set (TS-RGS), and a normal planetary gear set (PGS). The E-motors can be placed at the front end of the transmission, with one E-motor at the front and one in the middle between the gear sets, and with both E-motors in the middle between the gear sets.
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