Study on the Effect of Tooth Fatigue on Dynamic Performance of Gear Pair : 1st Report In the case of induction-hardened Chromium Molybdenum Steel Gears

In order to elucidate the failure mode, load carrying capacity and relation between tooth profile change and dynamic performance in fatigue process of a surface hardened gear, operational fatigue tests were performed using induction-hardened chromium molybdenum steel gears, The failure mode in these experiments was pitting or tooth breakage due to tooth surface fatigue except one example in which tooth breakage occurred at tooth fillet. Tooth root strain, mode in tooth stress frequency distribution, noise and vibration increased as the tooth profile was degraded, and it was also made clear experimentally that the failure prediction by sound level change was difficult for the tooth breakage at tooth fillet and tooth breakage due to spalling.