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        Home > Bearing Basic Knowledge > Minimum Loading > Minimum Load-Cylindrical Roller Bearings

        Minimum Load-Cylindrical Roller Bearings

        In order to keep bearings working in good condition, a minimum load must be imposed on bearings, particularly on bearings working at high speeds, high accelerations, or with the load direction changing frequently, because under these working conditions, inertial force of balls and cage and lubricant friction will have bad influence on the rotation of bearings, and detrimental sliding movement may be caused.

        The minimum load of a cylindrical roller bearing can be obtained from

        Minimum Load-Cylindrical Roller Bearings

        Where

        n - Working speed, r/min

        nr -(0.8~0.9)Limiting speed, r/min

        dm - Mean bearing diameter dm=0.5(d+D), ,mm

        Kr - Minimal load factors,the values are

        Dimension Series

        Kr

        10

        2、3、4

        22

        23

        100

        150

        200

        250

        When bearings are started at low ambient temperatures or in the condition that the viscosity of the lubricant is very high, bigger minimum load is required. Usually, the weight of the bearing supporting parts plus the load on the bearing have been over the required minimum load. If the weight cannot be up to the minimum load, extra radial load must be exerted on this type of bearing in order to meet the requirement of minimum load.

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