Elsevier

Wear

Volume 26, Issue 3, December 1973, Pages 335-353
Wear

Development of methods for evaluating traction fluids

https://doi.org/10.1016/0043-1648(73)90186-5Get rights and content

Abstract

Two methods have been developed for evaluating the performance of potential traction fluids. One method employed a 4-ball machine modified to measure torque and slip under rolling conditions. Aadvantages of the technique were the cheapness and replaceability of the rolling components, and the small amount of test fluid required. The other method was developed using a commercial traction drive, a Kopp variator; it was instrumented to allow measurement of torque and slip. There was a satisfactory correlation between results obtained in both pieces of apparatus for several fluids.

Fluids of widely varying compositions were examined in the 4-ball machine and clear indications of the necessary features for a good traction fluid are discussed. In general, fluids with higher pressure-viscosity coefficients were better tractants. There was a clear trend towards better traction with compositions containing high proportions of naphthenic material, an observation which confirmed the patent literature claims for such classes of compounds.

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