Study on the layer spalling of the KMPS546 speed reducer input conical

In this paper, the spalling of the gear teeth surface was studied. It was concluded that there did not exist any contact fatigue dehiscence in the gear through macroscopic analysis, microstructure analysis and morphology of incision analysis. The main reason of the dehiscence spalling in the gear teeth was the presentation of fissuary. The fissuraing expanded and developed under the alternating stress to the gear teeth surface layer spalling. The formation and enlargement of the fissuary had a strong relation with its treatment process.