Abstract
Frictional, conditions of the vane pump test were investigated using several hydraulic fluids that contained antiwear agents. Wear characteristics and frictional conditions were observed by measuring the electrical resistance between the vane and the ring. The surfaces of the vane and the ring were analyzed by using Electron Probe Micro Analyzer (EPMA) and Auger Electron Spectroscopy (AES). The data obtained from the vane pump tests and the surface analysis results were compared, with similar surface analysis results from the four-ball wear tests. The electrical resistance measurements indicated that vane and ring contact was caused by the discharge pressure led to the backside of the vane and also by the inertia force of the vane itself. Most pump wear occurred at the start of the pump test and rapidly decreased with time. Elemental compositions of the surface film analysis, both from the pump test and the four-ball test, varied with the antiwear agents and test conditions.
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