I have a question about angular contact ball bearings
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I have seen some pumps whose thrust bearings are of the double-row angular contact type; in most cases, they use single-row angular contact bearings in pairs. In what situations would one choose the double-row type, and what are the specific differences between double-row and single-row bearings?
Double-row designs can save axial space
The design is basically the same as that of the single-column version
The dual-row version experiences lower dynamic and static loads compared to two single-row units combined; it should be used with caution when limited clearance is available. The dual-row version has a shorter axial length than two single-row units, which helps save axial space. It is also easier to install and remove, reducing the risk of incorrect installation. There are fewer specifications available for dual-row versions, and no larger-sized ones exist
The specifications for double-row types can also accommodate very large SKF inner diameters of up to 280 mm
Angular contact ball bearings used in pairs are not simply two bearings placed together; they are adjusted during manufacturing, and the clearance when used in pairs is adjusted to a very high level of precision. At the same time, they are not inexpensive. The price for the double column version will be relatively lower, as there is no separate adjustment for this process. Besides price, there is another factor: when used in pairs, the directions can be combined in any way, such as back to back, face to face, or in series. Two columns won’t work; it’s only one direction available, so there’s no choice. Also, due to differences in structure, their allowable error for angles varies as well.