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Abstract
Optimum performance of some radial lip-type shaft seals requires a combination of properties in the elastomer: mechanical response requirements of the contact edge are different from those of the flex-section. Since this range of behavior is not available in a single elastomer, a “dual-material” oil seal has been designed and developed in which two or more elastomeric compounds are combined so that the product utilizes efficiently the optimum properties of each. One variation of the dual-material concept is a wear-resistant, low-friction material backed by a conventional elastomer. Frictional loss measurements during operation of an oil-seal is related to the degree of lubrication in the contact area, potential temperature build-up, wear rate, and sealing efficiency; and hence, furnishes a rapidly obtainable estimate of service life and long-term performance characteristics. Laboratory data expressing the dependence of the frictional losses (power consumption, W) on lubricant viscosity, T), shaft speed, N, and radial lip load, P—for dual-material seals, and conventional seals—have been rationalized in terms of the theory of lubricated friction: W = ϕ(PrN)(rNηs/P)n where r is shaft radius, s is the width of the contact edge, and ϕ and n are experimentally determined constants. The dependence of W on P provides a sensitive test for the degree of lubrication in the contact area.
Presented at the 26th ASLE Annual Meeting in Boston, Massachusetts, May 3–6, 1971
Notes
Presented at the 26th ASLE Annual Meeting in Boston, Massachusetts, May 3–6, 1971