A: Comparison of friction loss between rolling bearing and sliding bearing

Rolling bearing: small, friction coefficient is 0.001 ~ 0.003

Sliding bearing: dynamic pressure bearing: small, friction coefficient is 0.001 ~ 0.008 static pressure bearing: small, friction coefficient <0.001

The most obvious difference between rolling bearings and sliding bearings is whether there are rolling elements.

Rolling bearings: There are rolling elements (balls, cylindrical rollers, tapered rollers, needle rollers), which rely on their rotation to support the rotating shaft, so the contact point is a point. The more rolling elements, the more contact points.

Sliding bearing: There is no rolling element, and the rotating shaft is supported by a smooth surface, so the contact part is one surface.

The difference in structure between the two determines that the rolling bearing movement is rolling, and the sliding bearing movement is sliding, so the friction situation is completely different.