Spline Wear-Effects of Design and Lubrication

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Abstract
Spline couplings are widely used to transmit power or drive accessories, or to operate components within accessories. Their principal advantages are mechanical simplicity, compactness and light weight, and low cost. Although spline couplings have a reputation of being able to accommodate some angular misalignment, the dangers of tooth fracture, fatigue, and wear that may result should be recognized. Unfortunately, it is exceedingly difficult to achieve perfect alignment in practice; thus, the design process should prudently allow for some minimum misalignment attainable and accept a reasonable penalty. This paper is concerned with the wear of the spline teeth, which is the minimum price that must be paid if misalignment is present. Those design- and lubrication-related parameters that may be employed to minimize tooth wear are discussed.

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