Abstract
Traction grease is semisolid and produced by the dispersion of a thickener in traction oil. The traction coefficient of traction oil and grease are different especially in case of high peripheral speed or low temperature. The difference of film formation ability between them may cause the change of traction property. So the traction coefficient and film thickness are measured simultaneously in the range of temperature 253〜353 K, mean Hertzian pressure 0.39〜1.26 GPa peripheral speed 1.3〜5.2 m/s for traction oil and two kinds of traction greases whose consistency are different. Traction coefficient decreases in the range more than 0.5 μm. Using the measured traction coefficient of traction oil and the relation of film thickness difference between oil and grease. The estimated formula of traction coefficient for traction grease is derived. It is useful for more than 0.64 GPa in Hertzian pressure.
