Accession Number : ADD000373

Title :   Variable Stagger Angle Rotor Actuation Assembly.

Descriptive Note : Patent Application,

Corporate Author : DEPARTMENT OF THE AIR FORCE WASHINGTON D C

Personal Author(s) : Howald,Werner E

Report Date : 08 Nov 1974

Pagination or Media Count : 10

Abstract : The patent application relates to an actuator assembly for a variable stagger angle rotor system having a plurality of blades with the blade shank mounted in a support frame on bearings which permit 360 degrees rotation. The actuator for each of the blades limits the rotation to 45 degrees and includes a worm gear which engages a gear, secured to the blade shanks. The actuator includes two shells with one fixed to the support frame and the other attached to a ring gear which drives the worm gear. Each shell has two vanes which engage the wall of the other shell to form four cavities between the shells. Differential air pressure is supplied to the cavities to move one shell with respect to the other to rotate the blades. The actuation system is mounted on the forward rotor system so that its output is independent of the rotor speed.

Descriptors :   *Rotor blades(Turbomachinery), *Pneumatic actuators, Patents, Ducts, Pressure, Roller bearings, Cavities, Gears

Subject Categories : Jet and Gas Turbine Engines

Distribution Statement : APPROVED FOR PUBLIC RELEASE