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ROTATING PROPROTOR ARRANGEMENT FOR A TILTROTOR AIRCRAFT

  • US 20180079503A1
  • Filed: 09/21/2016
  • Published: 03/22/2018
  • Est. Priority Date: 09/21/2016
  • Status: Active Grant
First Claim
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1. A propulsion system for a tiltrotor aircraft, the propulsion system comprising:

  • an engine disposed within a fuselage;

    a first gearbox coupled to the engine;

    a wing member having a first rib, a second rib, a first spar, second spar and an upper wing skin, wherein the first rib, the second rib, the first spar and the second spar are coupled together to form a torque box;

    a drive shaft mechanically coupled to the first gearbox and disposed within the wing member;

    a second gear box coupled to the drive shaft and disposed either outboard from the second rib or inboard from the first rib;

    a rotatable proprotor mechanically coupled to the second gear box, the rotatable proprotor comprising;

    a plurality of rotor blades;

    a rotor mast having a rotor mast axis of rotation; and

    a proprotor gearbox coupled to the rotor mast, the proprotor gearbox being rotatable about a conversion axis, the conversion axis and the rotor mast axis of rotation intersecting at an intersection point, the intersection point being located in a central region within the torque box and above an airfoil surface profile of the upper wing skin.

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