The effect of the lubrication regime on gear performance hasbeen recognized, qualitatively, for decades. Often the lubricationregime is characterized by the specific film thickness defined asthe ratio of lubricant film thickness to the composite surfaceroughness. It can be difficult to combine results of studies tocreate a cohesive and comprehensive dataset. In this work gearsurface fatigue lives for a wide range of specific film values werestudied using tests done with common rigs, speeds, lubricanttemperatures, and test procedures. This study includes previouslyreported data, results of an additional 50 tests, and detailedinformation from lab notes and tested gears. The dataset comprised258 tests covering specific film values [0.47 to 5.2]. Theexperimentally determined surface fatigue lives, quantified as10-percent life estimates, ranged from 8.7 to 86.8 million cycles.The trend is one of increasing life for increasing specific film.The trend is nonlinear. The observed trends were found to be ingood agreement with data and recommended practice for gears andbearings. The results obtained will perhaps allow for the specificfilm parameter to be used with more confidence and precision toassess gear surface fatigue for purpose of design, rating, andtechnology development.
- Edition:
- 14
- Published:
- 10/01/2014
- Number of Pages:
- 18
- File Size:
- 1 file , 1.3 MB
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