External pillow block bearing is actually a variant of deep groove ball bearing, characterized by its outer ring outer diameter surface is spherical, can be matched into the corresponding concave spherical surface of the bearing housing to play the role of alignment.
UC200 series (light series), UC300 series (heavy series), and deformation products UB (SB) 200 series, if the use of environmental fit is small, usually select UC200 series, and vice versa, use UC300 series.
Usually the top wire on the pillow block bearings are two, its angle is 120 °, its characteristic is to cooperate with the shaft is to use the top wire to top on the shaft, then play a fixed effect, but its cooperation environment needs to be small oscillation scale. This kind of pillow block bearing is relatively widespread, widely used in textile machinery, ceramic machinery and other manufacturing industries.
UK200 series, UK300 series. This kind of pillow block bearing inner diameter is 1:12 share of tapered bore, when using with tightening sleeve cooperation, this kind of pillow block bearing features: can accept a greater load than with top wire pillow block bearings.
For example, the inner diameter of UC209 is 45mm, and the diameter of the shaft is 45mm, and if it is replaced with tapered pillow block bearing, only 45mm inner diameter can be selected, and the tapered pillow block bearings with 45mm can only be selected. The only ball bearing with tapered outer spherical surface is the UK210 (of course, if it fits higher, you can choose the UK310). Thus, the UK210 is accepted as a much larger fit than the UC209.
The main feature of such external pillow block bearings is that there is a certain degree of eccentricity at one end of the bearing, and there is the same degree of eccentricity of the eccentric sleeve with its cooperation. These bearings can also be said to be special bearings, because they are mainly used in agricultural machinery (harvesters, straw returning machines, threshers, etc.), these external pillow block bearings are mainly used in the layout of the runout is relatively strong, the cooperation of the offset layout can be useful to reduce the strong runout.
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