Self-aligning roller bearings, whose outer ring is spherical raceway and inner ring is double raceway, have automatic self-aligning performance. Therefore, the normal operation of the machine can still be guaranteed when the bearing is bent under load or when the axis of inner ring is inclined relative to the axis of outer ring due to machining errors and installation errors. The allowable angular errors of self-aligning roller bearings vary slightly according to different size series.
Structure and characteristics
Self-aligning roller bearings are generally cylindrical bore, there are conical bore, conical bore taper is generally 1:12. The self-aligning roller bearings with tapered holes can be fixed directly on the tapered journal by means of locking nuts, and the corresponding size of the fixing sleeve or retracting sleeve can be selected to install the bearings on the cylindrical shaft conveniently. The radial clearance of the bearing can also be adjusted by using the fastening sleeve. This kind of bearing cage mostly uses steel plate stamping cage, and can also supply double row self-aligning roller bearings with glass fiber reinforced polyimide compacted cage. This kind of cage has the advantages of good workmanship, light weight and good self-lubrication.
Double row self-aligning roller bearings are mainly used to withstand radial load, but they can also withstand smaller axial load while mainly bearing radial load, but can not withstand pure axial load.
In order to prevent the inertia force on the ball and cage and its friction with lubricant from having adverse effects on the rolling condition of bearings at high speed, and to cause harmful sliding between balls and raceways, bearings must bear a certain minimum radial load.