A coaxial counter-rotating propeller pitch changing device

Abstract

The invention discloses a coaxial counter-rotating propeller pitch changing device. The pitch changing rod is passed through the center hole of the inner shaft of the reducer. It is fixed on the front eccentric pin eccentrically fixed on each front blade; a pin is plugged and fixed on the pitch change rod facing the rear dial sleeve, and the pin passes through the long hole along the axial direction of the inner shaft of the reducer Inside; the two ends of the pin are respectively fixed on the inner sleeve of the high-speed bearing, and the outer sleeve of the high-speed bearing is fixed on the inner wall of the rear dial sleeve; the shift forks on the rear dial sleeve are fixed on the eccentrically fixed rear blades through bearings On the rear eccentric pin; the rear end of the distance changing rod is fixed on the outer sleeve of the dynamic and static conversion bearing, the inner sleeve of the dynamic and static conversion bearing is fixed on the fork lug inserted into the center hole of the pitch change rod, and the other end of the fork lug is fixed on the linear motion source. The invention can realize synchronous torque conversion of blades of double screw propellers, has simple structure, precise transmission motion and fast response speed.

Description

technical field [0001] The invention relates to a propeller pitch changing device. Background technique [0002] In the state of low-speed cruising, the tip of the propeller blade will form a tangential air vortex, which will cause a certain amount of energy loss. will cancel each other out and minimize the energy loss caused by eddy currents. Due to the principle of reaction force, when a propeller rotates, the air passing through the blade will generate a force opposite to the angular velocity of the engine, that is, torque; the torque generated by the two sets of counter-rotating blades of the coaxial counter-rotating propeller cancels each other out, and there is no need to pass Adjusting the ailerons of the aircraft to trim the torque simplifies the design of the aircraft and greatly increases the stability of the aircraft. Due to the elimination of the air vortex at the tip of the blade, the coaxial counter-rotating propeller can increase the efficiency by about 6%-1...

AI Technical Summary

Problems solved by technology

Because the two sets of blades of the coaxial counter-rotating propeller rotate in reverse, the existing single-row propeller pitch change mechanism cannot meet the pitch change requirements of the coaxial counter-rotating propeller. In order to realize the coaxial counter-rotating propeller, Need to study its variable distance mechanism

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