Abstract
In a traction drive under extremely high pressure condition, the influence of the lubricant compressive delay on traction performance cannot be ignored. It seems that the bulk viscosity of the lubricant brings the delay in response of the hydrostatic pressure to the applied normal stress. In this study, it is attempted that the bulk viscosity is measured using a compressive experimental apparatus. It is considered that measured results are fairly valid because increase in the bulk viscosity with pressure has the same tendency as that of shear viscosity. A traction map is drawn to take the influence of the compressive delay into consideration and discussed.
