A Coaxial Helicopter Control System with Variable Parallelism of Up and Down Rotor Tilters

Abstract

The invention discloses a coaxial helicopter control system with the parallelism of upper and lower rotor wing inclinators being changeable. The upper rotor wing inclinator is mounted below a reduction box. An upper rotor wing is controlled through a control long pull rod located in an inner shaft. The lower rotor wing inclinator is mounted above the reduction box to control a lower rotor wing. Longitudinal and transverse operation and heading operation are simultaneously conducted through five steering engines. Longitudinal control is achieved through the two longitudinal steering engines. The two inclinators are longitudinally and synchronously changed through control connecting rods. Transverse control of the upper and lower rotor wing inclinators is achieved through independent upper and lower rotor wing transverse steering engines correspondingly. Transverse nonparallelism of the upper and lower rotor wing inclinators is changed, and meanwhile, transverse control is conducted. Heading control is achieved in the mode that a heading control slide ring is controlled by a heading steering engine to move up and down, and movement is transmitted to lower rotor wing variable-pitch pull rods through a heading control supporting rod and a heading coordination lever. By adoption of the coaxial helicopter control system, changes of the transverse nonparallelism of the upper and lower rotor wing inclinators can be achieved, and the phenomenon that transverse upper and lower rotor discs obliquely get close even propellers hit with each other is improved.

Description

technical field [0001] The invention belongs to the technical field of aircraft design and manufacture, in particular to a coaxial helicopter control system with variable parallelism of upper and lower rotor tilters. Background technique [0002] Since the 1950s, countries around the world have conducted a large number of experiments and research on coaxial dual-rotor layout and aerodynamic characteristics. Among them, the Russian Kamov Design Bureau has always been the leader in coaxial helicopter research worldwide. The coaxial helicopter relies on the upper and lower coaxially reversed two pairs of rotors to balance the anti-torque, and provide lift and various manipulations without the need for a tail rotor. It has the advantages of compact structure and high aerodynamic efficiency at low and medium speeds while hovering. [0003] However, in the control system of traditional coaxial helicopters, the upper and lower rotors each have an automatic tilter, which is kept pa...

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the problem of beating the paddles existing in the above-mentioned coaxial helicopters, the present invention proposes a coaxial helicopter control system with variable parallelism of the upper and lower rotor tilters to solve the problems caused by the "paddle beating" phenomenon of the existing coaxial helicopters. The problem of low forward flight speed and poor wind resistance, as well as the increase in structural weight caused by increasing the rotor spacing to avoid "paddling"

Images