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The main axis speed is an important factor in choosing the lubricating oil viscosity. aviation bearing According to the theory of the formation of oil wedge, high-speed, between the spindle and the bearing lubrication in lubricating fluids must be used in order to reduce friction, low speed, in the boundary lubrication range must be with high viscosity oil low viscosity oil. Bearing temperature for plain bearing, bearing temperature is the most important property of lubricant viscosity. The viscosity is too low, Thin section bearing the bearing capacity is not enough, the viscosity is too high, the power loss and operating temperature will be unnecessarily high.