Coaxial contra-rotating type propeller pitch-varying device

Abstract

The invention discloses a coaxial contra-rotating type propeller pitch-varying device. A pitch-varying rod penetrates in a center hole of an inner shaft of a speed reducer, the front end of the pitch-varying rod is fixed together with a front poking sleeve, each poking fork on the front poking sleeve is fixed on a front eccentric pin eccentrically fixed on each front paddle by virtue of a bearing; a pin is inserted and fixedly arranged on the pitch-varying just facing a rear poking sleeve, the pin penetrates in a strip-shaped hole of the inner shaft of the speed reducer along an axial direction; two ends of the pin are respectively fixed on an inner sleeve of a high-speed bearing, an outer sleeve of the high-speed bearing is fixed on the inner wall of the rear poking sleeve; each poking fork on the rear poking sleeve is fixed on a rear eccentric pin eccentrically fixed on each eccentric paddle by virtue of a bearing; the rear end of the pitch-varying rod is fixed on an outer sleeve of a dynamic-static conversion bearing, an inner sleeve of the dynamic-static conversion bearing is fixed on a fork lug inserted in a center hole of the pitch-varying rod, and the other end of the fork lug is fixed on a linear movement source. The coaxial contra-rotating type propeller pitch-varying device can be used for realizing synchronous pitching varying of paddles of two propellers, and is simple in structure, accurate in transmitting movement, and high in response speed.

Description

Technical field [0001] The invention relates to a propeller pitch changing device. Background technique [0002] In the state of low-speed cruise, the tip of the propeller blade will form a tangential air vortex, which will cause a certain energy loss. At the theoretical level, the vortex generated when the two sets of blades of a coaxial counter-rotating propeller rotate 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 blades will produce a force opposite to the angular velocity of the engine, that is, torque; the torque produced by the two sets of counter-rotating coaxial propellers cancels each other out and does not need to pass Adjusting the ailerons to trim the torque, the design of the aircraft is simplified, and the stability of the aircraft is greatly increased. Because the air vortex at the tip of the blade is eliminated, the coaxial counter-ro...

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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