動力伝達用平歯車のピッチングについて : (第1報, 歯車試験片による実験)

概要

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In order to investigate the pitting phenomena that arises on the surface of the power transmitting gears, a four-square-type gear testing machine was built. The heat treated gears of 0.35% carbon steel were tested with the induction hardened pinions of 0.40% carbon steel, being lubricated by No. 180 turbine oil, whose temperature was kept at 50°±2℃, under various load conditions. It was observed that, when the tangential force was beyond 146 kg/cm, the pitting grew rapidly with the cycles of load repetition, and the involute errors, the dynamic loads of gear teeth and the noise of gears increased along with the growth. However, when the tangential force was 124 kg/cm, the pitting grew very slowly and even showed the tendency of limiting of the growth, which was attributed to the equalization of load by wear and to the work hardening of surface materials due to the repeated load.
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