Abstract
The traction coefficient μ of lubricants has the maximum value at a certain temperature. It tends to be decreased with decreasing temperature in the lower temperature range. An experimental equation on μ decrease was obtained by analyzing the μ-temperature transition condition and μ-temperature properties with the lubrication regime diagram. Based oin te experimental equation, the factors associated with the μ decrease and their influence was clarified. Also, μ decrease prediction map, overlapped the contour line of μ, was made on a lubrication regime diagram.
