/pdf/quantitative-characterization-of-micro-topography-a-2kb6z20ran.pdf

Quantitative characterization of micro-topography a bibliography of industrial surface metrology

https://cyberleninka.org/article/n/697665.pdf

Propagation of surface initiated rolling contact fatigue cracks in bearing steel

A review of friction predictions in gear teeth

Any rational approach to gear design must consider, as a minimum, the impact of the various modes of gear-tooth failure on gear performance; operating life and reliability; and size, weight, and cost. Gear teeth may fail basically by either strength-related or lubrication-related causes. However, many strength-related failures are influenced by lubrication, or may be induced by lubrication-related failures. This paper emphasizes the principal lubrication-related failure modes of gear teeth, and examines the complex interactions between gear mechanics and gear lubrication in affecting such failure modes. Presented at the 30th Annual Meeting in Atlanta, Georgia, May 5–8, 1975

Gear Failure Modes—Importance of Lubrication and Mechanics

The effect of surface roughness and lubricant film thickness on the contact fatigue life of steel surfaces lubricated with a sulphur-phosphorus type of extreme pressure additive

Pitting tests using 127 mm (5 in) centres distance gear rig under controlled conditions are described. These are compared with similar disc tests using the same materials and lubricants. Tests of both types confirm Dawson's conclusion that an important factor influencing pitting life is the ratio of surface roughness to the calculated lubricant film thickness. It has been shown that using a hunting tooth ratio, particularly when associated with a rough harder surface and a surface finish oriented normal to the motion, increases the likelihood of wear. Most importantly, the results show that using disc tests can greatly overestimate the pitting life of gears. These experiments and other evidence from the literature suggest that the most probable reason for these differences between gears and discs lies in dynamic gear loads.

J. F. Archard

Papers

Pitting of Gears and Discs