Abstract
Induction-hardened stintered powder metal gears having a module of 5, a standard pressure angle of 20° and a contact ratio of 1.246 were fatigue-tested using a power circulating gear testing machine, in order to elucidate the fatigue strength and the relationship between tooth surface failure and dynamic performance during the fatigue process. The fatigue limit for the number of cycles to gear failure of 108 was about 850 MPa by Hertzian stress. The failure mode of these gears was pitting. Pitting occurred at the dedendum flank of the gears in the initial stage of the fatigue process and developed to the addendum flank in the final stage of the fatigue process. The dynamic performance of the gears changed depending upon the tooth surface deterioration due to pitting. The pores existing on or beneath the tooth surface could play an important role in the initiation and propagation of pitting cracks.
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