Exploratory Analysis of Elastohydrodynamic Properties of Lubricants.
Final summary rept. 6 Jun 71-6 Jul 72,
SKF INDUSTRIES INC KING OF PRUSSIA PA RESEARCH LAB
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Film shape, inlet meniscus location, and sliding traction were measured in circular and elliptical contact of toroidal i.e. fully crowned steel rollers and flat disks of different materials under various load and speed conditions. The elliptical contacts had axis ratios of 41 and 13.61 and were achieved by using two types of rollers having different crown radii. Eight lubricants were investigated consisting of three ester based oils, a synthetic naphthenic hydrocarbon, synthetic paraffinic hydrocarbon with and without an anti-wear additive, a modified polyphenyl ether and a perfluoro ether. Lubricants are ranked according to traction coefficient value, and load and speed effects on traction coefficient are examined. Plateau film thickness measurements are compared to predictions of current theory. A new shape parameter for elliptical contact is proposed and shown to correlate with measured values of outlet constriction width. Original analysis is presented for predicting film thickness in circular contact in the presence of starvation, and accounts for the experimentally observed dependence of starvation on speed, viscosity, rolling element spacing and lubricant surface tension. An analysis is presented giving theoretical support to the observation that outlet constriction width decreases in the presence of starvation. Author
- Lubricants and Hydraulic Fluids
- Machinery and Tools