Abstract
1. When antiwear additives are used in lubricants for rolling-contact bearings, favorable effects due solely to antiwear action cannot be obtained unless boundary-lubrication conditions are achieved in the bearing; as a rule, this occurs only at high loads and high temperatures, with slow rotation or oscillating motion, or with combinations of these conditions. 2. Apart from their antiwear action, antiwear additives affect the stability of oils in a rolling-friction zone. Here the amount and nature of the effect (increase or decrease in stability) depends on the operating temperature and the chemical composition of the additive. 3. The selection of additives for rolling-contact bearing lubricants should be based on evaluations of their effects on both the antiwear properties of the lubricants and the stability of the lubricants in the rolling-friction zone.
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