Pump Gear Involute Profile for Generator Wear Reduction
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Solution Overview
Problem
Misalignment of gears in generator pump assemblies leads to increased wear and reduced durability, necessitating premature replacement due to uneven wear of gear teeth.
Innovation Solution
A pump gear with involute teeth having specific roll angles (εA-D) is designed to accommodate expected stresses, ensuring proper alignment and durability through a gear train configuration that includes a rotor gear, idler gear, and pump gear, with the pump gear mounted on a rotatable shaft within a generator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional pump gears are used in generator pump assemblies, then the gear train can operate at high rotational speeds, but misalignment of the gears leads to increased wear and reduced durability of the gear teeth
Solution Approach 1:
The patent modifies the geometric parameters of the involute teeth by specifying precise roll angles (εA=11.96°-13.96°, εB=14.79°-16.79°, εC=23.29°-25.29°, εD=26.12°-28.12°) at different reference points along the tooth profile. This parameter optimization allows the gear teeth to better accommodate expected stresses and misalignment conditions, reducing wear while maintaining high rotational speed operation
Solution Approach 2:
The patent applies different roll angle characteristics to different portions of the involute tooth profile (dividing the tooth into segments with reference points A-D). This local differentiation of geometric properties allows each segment of the tooth to be optimized for its specific stress and contact conditions, improving overall gear durability under misalignment
2Productivity
If the gear train operates at high rotational speeds, then productivity increases, but misalignment causes uneven wear of gear teeth necessitating premature replacement
Solution Approach 1:
By optimizing the roll angles at multiple reference points along the involute profile, the gear teeth are designed to distribute stresses more evenly during high-speed operation. This parameter optimization reduces uneven wear patterns that would otherwise occur at high rotational speeds, extending gear life while maintaining productivity
Solution Approach 2:
The modified involute profile with optimized roll angles acts as a preventive measure against the harmful effects of misalignment and high-speed stresses. The geometric design anticipates and cushions against the expected wear and stress concentrations before they occur, allowing the gear to withstand prolonged high-speed operation
Data Source
AI summary
A pump gear includes a pump 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.