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RESEARCH PAPERS

Surface Durability of Spur Gears at Hertzian Stresses Over Shakedown Limit

[+] Author and Article Information
Akira Ishibashi

Department of Mechanical Engineering, Saga University, Saga, Japan

Taku Ueno, Shigetada Tanaka

Department of Mechanical Engineering, Kyushu University, Fukuoka, Japan

J. Eng. Ind 96(2), 359-372 (May 01, 1974) (14 pages) doi:10.1115/1.3438338 History: Received July 19, 1972; Online July 15, 2010

Abstract

Using a new type of gear-load testing machine and a disk-type rolling fatigue testing machine designed and made by the authors, the upper limits of Hertzian contact stress allowable on rolling contact surfaces were investigated. It was shown conclusively that gears and rollers made of soft carbon steels could be rotated beyond 108 revolutions at Hertzian stresses over shakedown limit (≈ 0.4 HB ). In the case of gears, pits having a pitting area ratio of 0.04 percent occurred during 1.16 × 108 rotations at a Hertzian stress of 0.50 HB . However, no pitting occurred on the roller rotated through 1.20 × 108 revolutions at a Hertzian stress of 0.71 HB , although appreciable changes in texture were observed at the subsurface. In order to rotate gears or rollers at Hertzian stresses over shakedown limit, their surface must either be very smooth initially or after a short period of running, and an oil film must be formed between contacting surfaces.

Copyright © 1974 by ASME
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