Abstract
As test oils, two kinds of synthetic traction oils, two refined mineral oils (naphthene and paraffin types) and a conventional mineral oil were used for investigating the changes in the rolling contact fatigue strength (pitting limit) and the contact surfaces of low-hardness steel rollers with a hardness of HB≒190. In the case of pure rolling conditions, a high pitting limit of Pmax≒1300 MPa(132.6 kgf/mm2=0.70HB) was obtained regardless of the kind of test oil, in most cases. However, the pitting limit decreased drastically when sliding with a specific sliding of about 20% was introduced to the rollers lubricated with traction oils having a high traction coefficient of about 0.1. Changes in contact surfaces of these rollers were appreciable and the grinding marks were hardly observed after running even when no pitting occurred. The duration of full EHL conditions between the rollers was longer than that obtained using oils with a lower traction coefficient of about 0.04. It was estimated that the changes in the contact surfaces are closely related to the reduction in the pitting limit although they are not caused by metallic contacts between the rollers.
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