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Tannas Co. & King Refrigeration, Inc. Precision Laboratory Instruments for Routine Testing and Advanced Research & Development of Engine Oils, Lubricants, and Related Fluids

“Very High Shear Rate, High Temperature Viscosity Using the Automated Tapered Bearing Simulator-Viscometer”

Author: Theodore Selby, T.J. Tolton
Presented at Technische Akademie Esslingen (TAE) Tribology Colloquium, Germany - 1990
Written by T.W. Selby, Savant Inc., T.J. Tolton, Dow Corning Corp. -- 7th International Technische Akademie Esslingen (TAE) Tribology Colloquium, Automotive Lubrication, Stuttgart/Ostfildern, Germany, January 16-18, 1990. -- Published in the Handbook of Tribology and Lubrication Vol. 6, entitled “Engine Oils and Automotive Lubrication”, pp 470-490.
Abstract: While the automation of the Tapered Bearing Simulator Viscometer has been dependent on several state-of-the-art developments, its ability to be used as an absolute viscometer with relatively high precision was a first requirement. In view of the ease of changing and measuring shear rates while in operation, the TBS was chosen to produce the data for engine bearing oil-film-thickness correlation through use of the TBS in both automated and non-automated modes. An new test method shows considerable reduction in analysis time and an equally marked improvement in precision. The paper presents the background of the instrument; the steps of its automation; and its application to trenchant problems and new opportunities in the area of very high shear viscometry.