Importance

Loading Importance Indicators...

Abstract

An actuation system which includes apparatus for transferring control signals for varying the blade pitch from a non-rotating member to a rotating member of a gas turbine engine is described. In one embodiment, the engine includes a main disk containing a row of blades, and the disk is coupled to a main shaft which rotates about the engine axis. An actuating disk, or cone, rotates with the main disk, and the torque required to rotate the actuating cone is transmitted through ball splines attached to the main shaft. The ball splines allow transmission of torque between the disk and the cone and at the same time enable the disk and the cone to move axially relative to each other without binding. The actuating cone is supported at one end by the ball splines and at its other end by ball thrust bearings. The ball thrust bearings are pre-loaded to enable the bearings to withstand axial loads in opposite directions. The outer races of the bearings are supported by a ring, and the ring is connected to an actuator through a connecting cone. In addition to the actuating system, a blade support system is provided wherein the load of the blade is transferred from a blade 'button' head to the main disk through a load transfer ring, a bearing inner race support, and a thrust bearing. A nut retains a crank of the actuating system on the blade spindle. To rotate the blade about its radial axis, the ring is moved axially by the actuator. Such axial movement of the ring imparts axial motion to the rotating actuating cone, which rotates a crank attached to the blade. The thrust bearings allow the actuating cone to rotate about the centerline of the actuator and to move axially when actuated.

Loading the Abstract Image...

First Claim