Generator Rotor Gear Roll Angle Optimization
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Solution Overview
Problem
Misalignment of gears within the gear train of electrical generators leads to increased wear on gear teeth, reducing durability and necessitating premature replacement.
Innovation Solution
A rotor gear with involute teeth having specific roll angles (εA-D) is designed to accommodate expected stresses, ensuring proper alignment and reducing wear through a rotor gear body with a circumferential arrangement of teeth and a central axis, facilitating axial alignment with the idler gear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional gear teeth design is used, then manufacturing is simpler, but gear durability decreases due to misalignment-induced wear
Solution Approach 1:
The patent applies parameter changes by modifying the roll angles at specific reference points along the involute tooth surface. The roll angle varies continuously from approximately 12° at the tooth base (reference point A) to approximately 27° at the tooth tip (reference point D), with intermediate values at reference points B and C. This continuous variation in the roll angle parameter optimizes the tooth contact geometry to accommodate misalignment while distributing stresses more uniformly, thereby improving gear durability without fundamentally changing the manufacturing process.
2Reliability
If standard involute teeth are used, then manufacturing is easier, but wear resistance decreases under misalignment conditions
Solution Approach 1:
The patent applies local quality by making the roll angle characteristic vary locally along the length of the involute tooth surface. Different sections of the tooth (base, middle, tip regions corresponding to reference points A-D) have different roll angles tailored to the specific stress and contact conditions at each location. This localized optimization improves wear resistance in each region while maintaining overall tooth functionality.
3Strength
If gears are designed for high load capacity, then strength increases, but sensitivity to misalignment increases leading to uneven wear
Solution Approach 1:
The patent resolves this contradiction by continuously varying the roll angle parameter along the involute tooth surface. The roll angle increases from approximately 12° at the tooth base to approximately 27° at the tooth tip, creating an optimized contact pattern that distributes loads more uniformly across the tooth surface. This parameter variation allows the gear to handle high loads while maintaining uniform wear characteristics even under misalignment conditions.
Data Source
AI summary
A rotor gear includes a rotor gear body having involute teeth that each have an involute surface that extends between a tooth tip and a tooth base. The involute surface includes at least reference points A-D, with reference point A near the base, reference point D near the tip, reference point B between reference points A and D, and reference point C between reference points B and D. The reference points A-D have associated respective roll angles, εA-D, between a corresponding first line that is perpendicular to the involute surface at the given reference point A-D and a second line that is tangent at a reference point that lies on a terminal end of the involute surface at the tooth base to a reference base circle having a center origin at the center axis.