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Power transmitting mechanism for hybrid vehicle

  • US 8,585,523 B2
  • Filed: 11/18/2009
  • Issued: 11/19/2013
  • Est. Priority Date: 05/25/2009
  • Status: Expired due to Fees
First Claim
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1. A power transmitting mechanism for a hybrid vehicle having an engine, a main clutch, a motor/generator, a transmission, and a final reduction gear which are coaxially disposed, and using powers of the engine and the motor/generator in a combined manner, the power transmitting mechanism for the hybrid vehicle comprising:

  • an engine drive shaft coupled to an engine output shaft via the main clutch;

    a motor output shaft of the motor/generator rotatably supported separately from the engine drive shaft;

    a drive shaft brake releasing/fixing the engine drive shaft;

    a motor-brake releasing/fixing the motor output shaft; and

    a planetary gear mechanism formed of a ring gear coupled to the motor output shaft, a sun gear coupled to the engine drive shaft, a plurality of planetary gears with which the sun gear and the ring gear are engaged, and a planetary carrier coupled to the transmission and receiving and transmitting orbital motions of the planetary gears, wherein;

    by fixing the main clutch and releasing the drive shaft brake and the motor-brake, driving forces of the engine and the motor/generator are synthesized in the planetary gear mechanism to be transmitted to the transmission;

    by fixing the main clutch and the motor-brake and releasing the drive shaft brake, only the driving force of the engine is transmitted to the transmission from the planetary gear mechanism;

    by releasing the main clutch and the motor-brake and fixing the drive shaft brake, only the driving force of the motor/generator is transmitted to the transmission from the planetary gear mechanism, and the motor/generator is inversely operated when braking a vehicle to apply a regenerative brake; and

    by putting the engine in an idle state to fix the main clutch and inversely rotating the motor/generator to set an output from the planetary gears to “

    0”

    , the vehicle stops, and by changing the rotation of the motor/generator to a forward rotation side, the vehicle starts to move.

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