A method for controlling the assembly angle of coaxial counter-rotating twin-rotor shafts of a helicopter

By adding angle control markings and permanent markings to the rotor shaft and torque transmission gear, the problem of angle control in coaxial helicopter rotor shaft assembly has been solved, improving assembly efficiency and reducing costs. It is applicable to the assembly of coaxial counter-rotating dual rotor shafts.

CN116986008BActive Publication Date: 2026-05-26HARBIN DONGAN ENGINE GRP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
HARBIN DONGAN ENGINE GRP
Filing Date
2023-06-05
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

When assembling coaxial counter-rotor shafts in existing coaxial helicopters, angle control is difficult, tooling precision requirements are high and costs are high, resulting in low assembly efficiency. In addition, each configuration requires special tooling and cannot be universally used.

Method used

By adding angle control markings to the rotor shaft and torque transmission gear, the assembly angle between the rotor shaft and the transmission gear is calculated using a three-dimensional rectangular coordinate system, and a permanent mark is made after assembly to ensure that the rotor shaft angle meets the requirements, thus simplifying the assembly process.

Benefits of technology

It enables rapid determination of rotor shaft assembly angle, improves assembly efficiency, reduces costs, and is repeatable, making it suitable for multiple assembly and repair operations.

✦ Generated by Eureka AI based on patent content.

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Abstract

This invention belongs to the field of mechanical structure technology, and specifically relates to a method for controlling the assembly angle of a coaxial counter-rotating dual rotor shaft for a helicopter. The method analyzes the structural characteristics of the two rotor shafts and adds angle control markings during the machining and inspection of the rotor shafts and rotor shaft torque transmission gears. During rotor shaft assembly, the assembly angle between the rotor shaft and the rotor shaft torque transmission gear is calculated based on the angle control markings. Then, the assembly position is marked again on the rotor shaft torque transmission gear to ensure that the angles of the two rotor shafts meet the requirements after assembly.
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