Abstract
Nitrided aluminium chromium molybdenum steel gears were fatigue-tested using a power circulating gear testing machine. The effect of hardened depth on the load carrying capacity and failure mode of the nitrided gears and the relation between tooth profile change and dynamic performance in the fatigue process were experimentally elucidated. Three failure modes were recognized in these experiments ; one was tooth breakage due to bending fatigue at the tooth fillet, and the others were spalling on the tooth surface and tooth breakage due to spalling near the pitch point. Fatigue strength of the nitrided gears tended to increase with the increase of hardened depth. The changes of tooth root strain, noise and vibration profiles during the fatigue process were slight, since the change of tooth profile deterioration was insignificant.
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