A helicopter rigid rotor hub

Abstract

A helicopter rigid rotor hub, a plurality of pitch-variable arm modules are arranged around the center piece module; blades are fixed on the pitch-variable arm modules; the pitch-variable arm modules include blade mounts, outer radial lamination elastic bearings, Laminated Elastomeric Bearing, Inner Radial Laminated Elastomeric Bearing; The blade is fixed on the blade mount; Outer Radial Laminated Elastomeric Bearing and Inner Radial Laminated Elastomeric Bearing The outer ring is fixed on the blade mounting seat, and the outer ring is fixed on the center piece module; the inner ring of the inner radially laminated elastic bearing is fixed on the blade mounting seat, and the outer ring is fixed on the center piece module; the thrust lamination elastic bearing The bearing is composed of axially stacked laminated elastic bearings, the inner side of the thrust laminated elastic bearing is fixed on the blade mount, and the outer side is fixed on the center piece module; the axes of the three elastic bearings are collinear. The propeller hub of the present invention has the characteristics of high service life, no lubrication, no wear, no maintenance and the like.

Description

technical field [0001] The invention belongs to the field of helicopter rotor design, in particular to a helicopter rigid rotor hub. Background technique [0002] Helicopters have vertical take-off and landing and hovering capabilities, and have low requirements for take-off and landing sites. They can take off and land on non-paved ground or on the top of high-rise buildings in cities. Due to their flexibility, helicopters are irreplaceable in the field of aircraft. effect. Compared with fixed-wing aircraft, helicopters with traditional conventional configurations have low flying speed and poor endurance. In order to increase the flight speed of helicopters, new helicopter configurations such as coaxial high-speed helicopters have emerged. Coaxial high-speed helicopters use two pairs of rotors that turn in opposite directions to provide lift and thrust propellers to provide thrust, which can effectively improve the speed performance of helicopters. The rotor of the coaxia...

AI Technical Summary

Problems solved by technology

Due to the existence of the bearing clearance of the hingeless rotor hub, the blade will swing or shimmy in a small angle range around the structural clearance, which reduces the overall stiffness of the rotor, makes the natural frequency of the rotor deviate from the design value, changes the dynamic characteristics, and even causes dynamics problem

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