Researches on the Pitting of Power Transmitting Spur Gears : 3rd Report, The Effects of Lubrication on the Pitting

• Published in: Nippon Kikai Gakkai Rombunshū Vol. 28; no. 190; pp. 700 - 712
• Main Author: HASHIMOTO, Seiya
• Format: Journal Article
• Language: English; Japanese
• Published: The Japan Society of Mechanical Engineers 1962
• ISSN: 0029-0270; 2185-9485
• DOI: 10.1299/kikai1938.28.700

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 the various loads and lubricating conditions. It was observed that, if the loads were beyond a certain value (endurance limit), the pitting grew rapidly with the cycles of load repetition, and the involute errors and dynamic loads of gear teeth increased along with the growth of pitting, and if the loads were below the endurance limit, 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 lubricants and the peripheral speeds of the gear remarkably affect the endurance limit.