Actuation system for a lift assisting device and roller bearings used therein

An actuation system for deploying and retracting a lift assisting device of a wing of an aircraft, the actuation system comprising:

• a track pivotally coupled to the lift assisting device, the track having first and second outer surfaces and side surfaces;
• a shaft rotationally coupled within the wing of the aircraft and operable, in response to flight control signals, to deploy or retract the lift assisting device;
• means for actuating the lift assisting device, coupled to the shaft, between a retracted position to a deployed position along an arcuate path;
• a plurality of track roller bearings rotatably contacting the first and second outer surfaces of the track to guide the track along the arcuate path;
• and
• a plurality of side roller bearings rotatably contacting at least one side of the track to guide the track along the arcuate path
• wherein the plurality of track roller bearings includes at least one lined track roller assembly comprising:
• an outer ring having inner bearing surfaces;
• and an inner split ring having a first portion and a second portion, each of the first and second portions having outer bearing surfaces, the inner split ring configured for accommodating deflection and bending of a mounting pin coupling the lined track roller bearing to the track.