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Electromechanical variable transmission

  • US 10,029,556 B2
  • Filed: 08/25/2016
  • Issued: 07/24/2018
  • Est. Priority Date: 06/22/2010
  • Status: Active Grant
First Claim
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1. A drive train for a vehicle, comprising:

  • an engine having an output shaft;

    a first gear set comprising a sun gear, a ring gear and planetary gears coupling the sun gear to the ring gear;

    a second gear set comprising a sun gear, a ring gear and planetary gears coupling the sun gear to the ring gear, wherein the planetary gears of both sets are rotatably supported by respective planetary gear carriers;

    a first motor/generator coupled to the first gear set;

    a second motor/generator coupled to the second gear set and electrically coupled to the first motor/generator;

    a first clutch that selectively engages the output shaft of the engine with the second motor/generator; and

    a second clutch and a third gear set that cooperate to selectively engage the ring gear of the second gear set with the planetary gear carrier of at least one of the first gear set and the second gear set.

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