The design of double row deep groove ball bearings is basically the same as that of single row deep groove ball bearings. The deep groove ball shaft-shaped raceway plus the excellent closeness between the raceway and the steel ball. In addition to bearing radial load, double row deep groove ball bearings can also bear axial loads acting in two directions.
Double row deep groove ball bearings are suitable for bearing arrangements where the load capacity of a single row deep groove ball bearing is insufficient. For double row deep groove ball bearings with the same outer and inner diameters as deep groove ball bearings, the width is larger and the load capacity is much higher than that of the 62 and 63 series single row deep groove ball bearings.
The standard deep groove ball bearing has the radial internal clearance of the ordinary group.
When there is a misalignment between the inner and outer rings of a double row deep groove ball bearing, it will cause additional load. Thereby increasing the load borne by the steel ball and cage and shortening the working life of the bearing. Therefore, the allowable angle error is only 2 arc minutes. Any larger angle error will result in an increase in noise.
Double row deep groove ball bearings are equipped with two glass fiber reinforced nylon 66 cages. The suffix of SKF is TN9.
Deep groove ball bearings equipped with nylon cages can operate at temperatures up to 120°C.
The characteristics of the cage are not affected by the lubricants used in general rolling bearings, except for certain synthetic oils or greases based on synthetic oils and lubricants containing a large amount of extreme pressure additives for high temperature applications.
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