Point-Surface-Origin, PSO, macropitting occurs at sites ofGeometric Stress Concentration, GSC, such as discontinuities in thegear tooth profile caused by micropitting, cusps at theintersection of the involute profile and the trochoidal rootfillet, and at edges of prior tooth damage such as tip-to-rootinterference. When the profile modifications in the form of tiprelief, root relief, or both are inadequate to compensate fordeflection of the gear mesh, tip-to-root interference occurs. Theinterference can occur at either end of the path of contact, butthe damage is usually more severe near the start-of-active-profile,SAP, of the driving gear. An FZG-C gearset (with no profilemodifications) was tested at load stage 9 and three pinion teethfailed by PSO macropitting. It is shown that the root cause of thePSO macropitting was GSC created by tip-to-root interference.
- Edition:
- 10
- Published:
- 10/01/2010
- Number of Pages:
- 11
- File Size:
- 1 file , 710 KB
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