Gears scuffing

School of Engineering, Cardiff University, Cardiff CF24 3TA, UK, e-mail snidler cf.ac.uk Keywords gears, scuffing, pitting, friction, elastohydrodynamic lubrication. 

Powrie, H.E.G., Fisher, C.E, Tasbaz, O.D. and Wood, R.J.K., Performance of an Electrostatic Oil Monitoring system during an FZG gear scuffing test. International Conference on Condition Monitoring, University of Wales Swansea, 12-15 April 1999. 

Powrie, H E G Wood, R J K. Harvey, T J, Morris, S, Re-analysis of electrostatic wear-site sensor data from FZG gear scuffing tests. International Conference on Condition Monitoring, 25th-27th June 2001 also Condition Monitor, ISSN 0268/8050, Sept 2001 6-12... 

The types of wear and failure that occur in metallic gears are distinctive and have been subjected to close analysis over many years. The more common types of failure are abrasion, scuffing, pitting, corrosion, plastic yielding and... 

These classes of compounds were the first used during the industrial revolution to improve the performance of machinery and were developed to improve the scuffing load of gear lubricants. Examples of typical structures of sulphur/nitrogen compounds which have found application are given in Fig. 3.12. 

For industrial gears where the conditions of tooth engagement are not excessively severe, and the danger of scuffing is small, mineral base oils may be used. The choice of oil viscosity depends on the transmitted power and pinion speed, Fig. 8.7. In general, the lubricant viscosity required decreases as the speed increases, and... 

Figure 14-10. Genesis of scuffing on the rubbing face of a gear tooth, (a) view of regions rubbed at three progressively increased load steps in the Ryder test. (b) Shows the orientation of the imprint of the narrow tooth on the wide tooth of the test gear set.

Niemann and Lechner [45] investigated surface temperatures of gear teeth with respect to scuffing. This problem is complicated by the... 

Several PC software programs exkt to aid in lubricant selection to rednce wear, scuffing, and pitting of gear-tooth surfaces. See Specifications and Standards at the end of thk chapter. 

This paper briefly reviews some current research on gear tooth contact lubrication that will lead to a better understanding of the problems of micropitting, scuffing and gear and transmission lubrication in general. 

Regardless of the application, the scoring or scuffing resistance of the gear teeth should be investigated. In many cases, it will be desirable to use an oil with appropriate extreme-pressure additives that greatly increase the antiweld or antiscoring characteristics of the lubricant. 

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