How to determine fatigue pitting on gears?

1. Generally speaking, considering cost and assembly errors, the tooth width of a small gear should be 5-10mm smaller than that of a large gear. Under the same material strength, the strength of a small gear is weaker than that of a large gear; Sometimes the small gear has a gear shaft structure. Considering the strength verification of the shaft itself, the material strength will be better than the large gear, so the strength of the large gear is weaker. Therefore, the specific situation needs to be analyzed in detail;
2. When using open gear transmission, due to poor lubrication of the tooth surface and high levels of impurities in the environment, the main forms of gear failure are tooth breakage and tooth surface wear. As the current method of gear wear is not yet perfect, the main focus is on checking the bending strength of the gear tooth root; When using closed gear transmission, the main form of failure is tooth surface fatigue pitting, with the main focus on checking the contact strength of the tooth surface; The specific verification method can refer to ISO6336 or GB3480;