What are the five forms of gear failure?

1 Answers
Rex
07/30/25 8:52am
Gear failure manifests in five forms: tooth breakage, pitting, scuffing, wear, and plastic deformation. Below are detailed explanations: Causes of gear failure: During operation, the maximum bending stress occurs at the tooth root. Combined with stress concentration caused by sudden cross-section changes at the fillet transition and machining marks, repeated loading leads to fatigue cracks at the tooth root. These cracks propagate gradually, ultimately resulting in tooth fatigue fracture. Methods to prevent gear failure: Increase tooth surface hardness and reduce surface roughness. Decrease module size and tooth height to lower sliding coefficient. Maintain appropriate hardness difference between large and small gears when using identical materials. Implement profile modification to enhance transmission stability, and utilize gear materials with superior anti-scuffing properties.
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