Abstract
High-pressure viscosity was measured for lubricant oils including a traction CVT oil up to 2.7 GPa at elevated temperature up to 200℃ employing a falling sphere method in a diamond-anvil pressure cell (DAC). The obtained relations between logarithmic viscosity and pressure at all temperature (40℃〜200℃) showed the non-linearity with some data scattering. Therefore, viscosity-pressure coefficient α was not constant and decreased with pressure for lubricant oils and increased for a traction CVT oil. α was also dependent on temperature. These dependence should be considered for EHL oil film thickness analyses concerning fatigue life of machine elements. A pressure temperature phase diagram of liquid-solid transition was plotted from the obtained high pressure viscosity, which predicts traction feature.
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