Precise Mesurement of Traction Coefficient at Low Temperature

Abstract

The traction coefficient generally decreases according as the temperature rise. In this study an effect of heat in the contact area to the characteristic of tracion oil at low temperature is examined and the precise measurement of traction coefficient at low temperature is developed modifying the method of temperature measurement. The film temperature is estimated by the formula and the bulk temperature is measured by the thermocouple which is put beneath the roller. The traction coefficient is measured at low temperature in case of the traction oil and the traction grease. The maximum traction coefficent changes according as the temperature and shows the peak at 300K. It decrease in the range less than 300K. The difference between the traction coefficient of the traction oil and that of the traction grease is not observed.