On the Pitting of Power Transmitting Spur Gears

概要

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In order to investigate the pitting phenomena, the heat treated gears of 0.35% carbon steel and the induction hardened pinions of 0.40% carbon steel were tested with the gear endurance testing machine under various loads, lubricant temperatures and pitch-line velocities. It was observed that, if the loads were beyond a certain value (endurance limit), the pitting grew rapidly with the cycles of load repetition, then it results in progressive pitting, and the involute errors and dynamic loads of gear teeth increased along with the growth of pitting, and if the loads were less than the endurance limit, then it resulted in non-progressive pitting, and the pitting appeared to grow only to a certain extent but not any further, and in this case the involute errors and dynamic loads changed little. It is noteworthy that the viscosity of lubricant and the pitch-line velocity of the gear remarkably affect the endurance limit.
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