Single sealed bearing (code Z or RS named bearing 60) with iron seal or rubber seal, and KA nylon retainer can also add a seal called KAZ or KA|2RS. Such bearings are both convenient with the installation and grease injection as open bearing , but also has a good sealing performance. Because a lot of bearings installation only have one side leakage in the outside.
Compared with the sliding bearings, the rolling bearings the advantages are:
(1) under the general conditions, the efficiency of the rolling bearings and hydrodynamic lubrication bearings are quite, but a higher number of mixed lubrication bearings;
(2) the radial clearance is relatively small, the centripetal angular contact bearing preload available available pretightening force to eliminate the clearance, high running accuracy;
(3) for the shaft diameter of the same size, the width of the rolling bearing is smaller than that of the sliding bearing, and the axial structure of the machine is compact;
(4) most of the rolling bearings can be subjected to radial and axial loads at the same time, so the bearing assembly is simple;
(5) less lubricant, easy to seal, easy to maintain;
(6) no need to use non-ferrous metals;
(7) the high degree of standardization, mass production, low cost.
Compared with the sliding bearings, the rolling bearings shortcomings are:
(1) the ability to withstand impact load is poor;
(2) the life of bearing under high speed and heavy load is low;
(3) vibration and noise;
(4) the radial dimension of the sliding bearing.
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