Bending Fatigue Strength of Spur Gears in Vacuum

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This paper presents a study on the bending fatigue characteristic of normalized S45C spur gears in vacuum under two-step loading conditions as well as uniform cyclic loading. for this experiment was used a gear bending fatigue testing machine of hydraulic type with a vacuum chamber of stainless steel, which was developed by the authors, and is available for the tests in various atmospheres. The difference between bending fatigue limits in air and in vacuum is hardly noticeable. The cyclic life, however, shows the tendency to be extended with a decreasing pressure in vacuum atmosphere (p≦10^<-3> torr). Both the maximum cumulative cyclic ratios S for normalized S45C gears in air and in vacuum are nearly equal to 1.5, which is intermediate between those for shotpeened S45C gears and for annealed S15C gears.
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