Abstract
Gears designed for high load carrying capacity after conventional criteria have relatively small amount of profile and lead crowning modification. As a result, tooth tip edge and tooth side edge contact rather strongly on mating tooth flank and have much influence on failures. In the previous report, chipping of tooth side edge was investigated and the details of characteristics of the failure due to chipping were reported. On the other hand, the surface of wider tooth flank which contacts with side edge of mating tooth is polished after small loading cycles and then pitting failure occurs in that polished area. Those pits expand in tooth lead direction to the middle of tooth and finally form a large surface failure like spalling or flaking. Cracks initiating from that spalling cause tooth breakage. High contact pressure, high stressed condition and longitudinal slipping due to Hertzian elastic deformation at tooth side edge contact as well as slip by progress of meshing and insufficient oil film thickness, are considered to be major reasons of this type of pitting.
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