Abstract
Traction characteristics of polymer solutions were determined at a constant rolling speed of 0.05m/s over a range of temperature with a disk on ball type EHL tester using steel disk. As the temperature is raised, the traction curves of base oil as well as conventional polymethacrylate containing oil increase, while those of dispersant type polymethacrylate containing oil remains constant. Such a tendency was more significant for hydro cracked oils than solvent refined oils. The measured oil film of dispersant type polymethacrylate containing oil showed much thicker than polymethacrylate containing oil. It was inferred that dispersant group of DPMA contributed to the friction reduction due to thick film formation in EHL contact.
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