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Fundamental gear system architecture

  • US 10,221,770 B2
  • Filed: 02/26/2014
  • Issued: 03/05/2019
  • Est. Priority Date: 05/31/2012
  • Status: Active Grant
First Claim
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1. A gas turbine engine comprising:

  • a fan including a plurality of fan blades rotatable about an axis;

    a fan pressure ratio across a fan blade alone of less than 1.45;

    a bypass duct;

    a compressor section;

    a bypass ratio greater than ten (10), the bypass ratio being defined as the portion of air delivered into the bypass duct divided by the amount of air delivered into the compressor section;

    a combustor in fluid communication with the compressor section;

    a fan drive turbine in communication with the combustor, the fan drive turbine comprising a pressure ratio greater than about 5, wherein the fan drive turbine further includes an inlet having an inlet pressure, and an outlet that is prior to any exhaust nozzle and having an outlet pressure, and the pressure ratio of the fan drive turbine is a ratio of the inlet pressure to the outlet pressure;

    a gear system providing a speed reduction between the fan drive turbine and the fan and transferring power input from the fan drive turbine to the fan at an efficiency greater than 98%, wherein the gear system further comprises a gear reduction ratio of greater than 2.3;

    an input shaft arranged in a driving relationship to the fan drive turbine;

    a gear support system including a flexible support structure supporting at least one gear of the gear system relative to the input shaft;

    a lubrication system providing lubricant to rotating components of the engine including the gear system and removing thermal energy from the lubricant, wherein the lubrication system comprises a first lubrication system providing lubricant flow to the gear system and a second lubrication system supplementing operation of the first lubrication system in response to an interruption in lubricant flow from the first lubrication system; and

    a low corrected fan tip speed is less than about 1150 ft/second, wherein the low corrected fan tip speed is an actual fan tip speed at an ambient temperature divided by [(Tram °

    R)/518.7)0.5], where T represents the ambient temperature in degrees Rankine.

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