Patent ID: 8672627
Filing Date: 2014-03-18
Classification: B64C,Y02T

Abstract:
1. A helicopter rotor blade comprising: a blade body which defines a confined space; a control flap rotatably secured to said blade body for movement through a range of motion defined about a control flap axis of rotation; a direct current brushless motor secured in said blade body that rotates a motor shaft; and a transmission device secured to said motor shaft and said control flap, said transmission device operable to transfer rotary motion of said direct current brushless motor about a motor shaft axis of rotation parallel to said control flap axis of rotation to said control flap for movement through said range of motion, said transmission device remains entirely within said confined space throughout said range of motion, said transmission device comprises a worm gear set and a pair of bevel gears, said worm gear set connected to said control flap to pitch said control flap through said range of motion.