Generator Driven Gear Tooth Profile for Stable Output Frequency
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Solution Overview
Problem
Integrated drive generators in aircraft face challenges in maintaining a constant frequency of electric power generation due to varying input shaft speeds from gas turbine engines, which affects the speed and frequency of the generator driven gear.
Innovation Solution
The implementation of a replacement generator driven gear with a specific gear tooth profile, characterized by unique roll angles at points A, B, C, and D, and a method for replacing the existing generator driven gear within an integrated drive generator system, ensuring a consistent speed and frequency output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional generator driven gear is used with varying input shaft speeds, then the generator can operate with flexible speed input, but the output frequency becomes variable and unacceptable
Solution Approach 1:
The patent applies parameter changes by modifying the gear tooth profile geometry, specifically the roll angles at different points (A, B, C, D) along the tooth profile. This geometric parameter modification allows the gear to maintain a constant output frequency despite variations in input shaft speed, resolving the contradiction between input flexibility and output consistency.
2Manufacturing precision
If the gear tooth profile is modified with specific roll angles, then the output frequency consistency is improved, but the manufacturing complexity increases
Solution Approach 1:
The patent defines specific parameter ranges for roll angles at different gear tooth profile points (A: 14.2-15.7°, B: 16.2-17.7°, C: 22.3-23.8°, D: 24.3-25.8°). These controlled parameter specifications enable consistent performance while providing clear manufacturing targets, balancing precision requirements with manufacturability.
Data Source
Figure 1
Figure 2A~2C
AI summary
A generator driven gear for use in an integrated drive generator has a gear body extending between a first end and a second end and having a disc extending radially outwardly. A boss extends from the disc toward the second end. There are outer gear teeth outwardly of an outer diameter of the disc. The outer gear teeth having a unique gear tooth profile with roll angles A, B, C, and D. An integrated drive generator and a method are also disclosed.