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Hybrid electric vehicle

  • US 9,079,485 B2
  • Filed: 12/27/2008
  • Issued: 07/14/2015
  • Est. Priority Date: 12/28/2007
  • Status: Expired due to Fees
First Claim
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1. A hybrid electric drive system for an automotive vehicle comprising:

  • a heat engine outputting power through a crankshaft;

    a transmission having an input shaft and an output shaft;

    an electric motor having a motor shaft being connected to said input shaft;

    a one-way-clutch disposed between said crankshaft and said motor shaft, being able to transmit torque from said crankshaft to said motor shaft but nut from said motor shaft to said crankshaft; and

    a torque-limiting device disposed between said crankshaft and the rotor of said electric motor, said torque limiting device selectively coupling said crankshaft and said motor shaft, said torque-limiting device transmitting a pre-determined level of torque when engaged;

    wherein when said torque-limiting device is disengaged, said motor can drive the vehicle solely;

    when said torque-limiting device is engaged, said motor can crank said engine;

    in order to start said engine while the vehicle is running, said torque-limiting device is engaged and transmits a torque to crank said engine and smoothes out the reaction torque peak that said crankshaft applies on said motor shaft;

    said engine outputs power through said one-way-clutch to said motor shaft and said input shaft.

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