Variable pitch propeller rotor

摘要

A bladed rotor comprises a rotor body 2 carrying blades 6, whose pitch can be varied by means of a pitch input shaft 10. The pitch input shaft 10 drives the respective blade 6 about a spanwise axis X of the blade through a harmonic drive reduction gear 14. The harmonic drive reduction gear 14 comprises a wave generator 16 which is fixed for rotation on the pitch input shaft 10 and a flex spline which meshes with a circular spline 20 and is secured to the blade 6.

主权项

1. A variable pitch bladed rotor comprising a rotor body carrying a plurality of blades, each blade having a blade root supported by bearings in a blade hub of the rotor body so as to be pivotable relative to the rotor body about respective spanwise pitch axes, each blade being drivably coupled to a pitch control mechanism by a respective pitch input shaft which is aligned with the pitch axis and which is drivingly connected to the blade by a harmonic drive reduction gear, the harmonic drive reduction gear comprising a circular spline in toothed engagement with a flex spline and a wave generator arranged to generate a travelling wave in the flex spline, wherein the circular spline is fixedly mounted on the blade hub and the flex spline is secured to the blade root.