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Dynamic pressure sliding bearing is most widely used in sliding bearing of a class, surface profile measurement ，including liquid (oil and non oil lubricating medium) and gas dynamic pressure lubrication two types. Oil lubrication sliding bearing, comprising a single oil wedge (integral), double oil wedge, multi oil wedge (overall or tilting pad) step surface and so on many kinds of types and lubrication characteristics are different. General requirements in rotary dynamic pressure effect, bearing spindle with smaller intervals (high precision machine tools required to achieve 1 ~ 3 m), four-row-cylindrical-roller-bearings have a higher degree of rigidity, temperature rise is low.