Patent ID: 9126681
Filing Date: 2015-09-08
Classification: B64C

Abstract:
1. A mechanical structure for a rotor blade pitch change mechanism in a teetering rotor head, the mechanical structure comprising: two teetering sidewalls, each teetering sidewall having an inside, which faces the other teetering sidewall, and an outside, which is opposite the inside of each teetering sidewall, a three piece hollow central tower, located between the two teetering sidewalls, composed of a top section, a middle section, and a bottom section, with the top section supporting horizontally a teeter bolt, with windows in the middle section, and with the bottom section to receive main bearings, the teeter bolt, passing through the top section of the hollow central tower, connecting the teetering sidewalls in an upper region of the teetering sidewalls, an actuating shaft sliding inside a hollow main spindle, the main spindle passes through the bearings located in the bottom section of the hollow central tower, between the teetering sidewalls, a carrier attached to an upper portion of the actuating shaft, located in the hollow central tower, two upper pitch change levers, located on opposite sides of the carrier, the upper pitch change levers pass through the windows in the middle section of the hollow central tower, two pitch linkage plates slideably engaged on the teeter bolt and stabilizing pins on the inside of the teetering sidewalls, the pitch linkage plates engage the two upper pitch change levers that pass through the windows in the hollow central tower, two rotor blade anchor blocks, each attached between the two teetering sidewalls, the rotor blade anchor blocks are located at opposite ends of the teetering sidewalls in a horizontal direction, two blade root anchor bolts, each supported by a rotor blade anchor block, a blade root pitch change lever attached to each blade root anchor bolt, the blade root pitch change levers engaged with respective pitch linkage plates.