Rigid rotor hub of helicopter

Abstract

The invention discloses a rigid rotor hub of a helicopter. A plurality of variable-pitch arm modules are arranged around a center piece module; paddles are fixed on the variable-pitch arm module; eachvariable-pitch arm module comprises a paddle mounting base, an outer side radial laminated elastic bearing, a thrust laminated elastic bearing and an inner side radial laminated elastic bearing; thepaddles are fixed on the paddle mounting bases; the outer side radial laminated elastic bearings and the inner side radial laminated elastic bearings have the same structure; an inner ring of each outer side radial laminated elastic bearing is fixed on the corresponding paddle mounting base, and an outer ring of each outer side radial laminated elastic bearing is fixed on the center piece module;an inner ring of each inner side radial laminated elastic bearing is fixed on the corresponding paddle mounting base, and an outer ring of each inner side radial laminated elastic bearing is fixed with the center piece module; each thrust laminated elastic bearing is composed of laminated elastic layers stacked in the axial direction, the inner side of each thrust laminated elastic bearing is fixed to the corresponding paddle mounting base, and the outer side of each thrust laminated elastic bearing is fixed to the center piece module; and the axes of the three elastic bearings of each variable-pitch arm module are collinear. The rigid rotor hub has the advantages of being long in service life and free of lubrication and maintenance, having no abrasion, 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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