Improving Gear Tooth Bending Fatigue Life
Problem Statement
Helicopter transmission life limits load carrying capacity and acceleration. Improved gear bending fatigue life will allow heavier loads and improved acceleration. New designs are costly and require long development times. A process improvement for an existing design saves time and money.
Process Description
A change from conventional oil quench hardening to intensive water quenching produced higher compressive surface residual stress. This in turn resulted in a 15% increase in bending fatigue endurance in carburized Pyrowear 53 gears.
Benefits
The quench process change achieved improved bending fatigue life with no gear redesign or alloy change. The water quenching method was more environmentally friendly than oil quenching and safer.
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