Study on broken teeth of sun gear of wind turbine gearbox

In this paper,the causes of the broken teeth of the sun gear were analyzed and discussed.SEM images showed that there were a large number of aggregated nonmetallic inclusions at the fracture surface of fatigue source,and the continuity of the metal matrix was damaged by inclusion.This will cause local stress concentration,resulting in the initiation of cracks,and eventually lead to fatigue broken teeth of sun gear.