Journal ArticleDOI
Pitting of Gears and Discs
R. A. Onions,J. F. Archard +1 more
- Vol. 188, Iss: 1, pp 673-682
TLDR
Pitting tests using 127 mm (5 in) centres distance gear rig under controlled conditions are described in this paper, which confirm Dawson's conclusion that an important factor influencing pitting life is the ratio of surface roughness to the calculated lubricant film thickness.Abstract:
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.read more
Citations
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Journal ArticleDOI
Propagation of surface initiated rolling contact fatigue cracks in bearing steel
TL;DR: In this article, a triple-contact disc machine was used to perform pitting experiments on bearing steel samples under closely controlled contact conditions in a mixed lubrication regime, and the growth of rolling contact fatigue cracks before they develop into surface pits was investigated.
Journal ArticleDOI
A review of friction predictions in gear teeth
TL;DR: In this paper, a brief resume of the theoretical background in the more important situations is given of the application of lubrication theories (based on disc machine tests) to gears, the correlation of disc and gear tests is discussed.
Journal ArticleDOI
Gear Failure Modes—Importance of Lubrication and Mechanics
TL;DR: In this article, the principal lubrication-related failure modes of gear teeth are discussed, and the complex interactions between gear mechanics and gear lubrication in affecting such failure modes are examined.
Journal ArticleDOI
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
M.R. Phillips,T.F.J. Quinn +1 more
TL;DR: In this paper, the Amsler disc-on-disc machine was used to obtain the life to first pit for two medicinal white oils and (ii) the same oils plus a sulphur-phosphorus type of extreme pressure additive.
References
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Journal ArticleDOI
A simple theory of asperity contact in elastohydro-dynamic lubrication
TL;DR: In this article, the Greenwood and Williamson theory of random rough surfaces in contact has been combined with established elastohydrodynamic theory to provide a theoretical approach to highly loaded lubricated contacts in which the load is shared between hydrodynamic pressure and asperity contact.
Journal ArticleDOI
Stresses Due to Tangential and Normal Loads on an Elastic Solid With Application to Some Contact Stress Problems
J. O. Smith,Chang Keng Liu +1 more
Journal ArticleDOI
Effect of Metallic Contact on the Pitting of Lubricated Rolling Surfaces
TL;DR: The degree of metallic contact, expressed as the ratio of the surface roughness to the oil film thickness, is found to play an important part in determining the pitting behaviour of lubricated rolling surfaces as discussed by the authors.
Journal ArticleDOI
The theory of partial elastohydrodynamic contacts
TL;DR: In this article, the influence of the partial EHD condition on EHD film thickness, normal load sharing between asperities and EHD, frictional traction, mild and severe wear, surface fatigue and spalling fatigue are described.