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Differential geared engine

  • US 4,251,987 A
  • Filed: 08/22/1979
  • Issued: 02/24/1981
  • Est. Priority Date: 08/22/1979
  • Status: Expired due to Term
First Claim
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1. A gas turbine engine comprising:

  • a compressor, a turbine and a nozzle, the geometry of which partially defines a flow passage through the engine;

    a rotatable load;

    differential gearing receiving power from said turbine and transmitting power to said compressor and load; and

    means for selectively varying the engine flow passage-defining geometry to modulate the torque versus speed characteristic of at least one of the pair comprising said load and said compressor and to selectively modulate the rotational speed relationship between the compressor, turbine and load, wherein said differential gear means comprises;

    a first sun gear driven by said turbine at turbine rotational speed;

    planet gearing engaging said first sun gear; and

    a ring gear driven by said planet gearing for driving said load in rotational motion with respect to said turbine; and

    whereinsaid planet gearing is operatively connected to said compressor for rotationally driving said compressor with respect to said turbine.

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