Axial angular contact ball bearings

Double direction angular contact thrust ball bearings are non-self-retaining precision bearings with restricted tolerances of class SP. They consist of solid shaft washers, spacer rings, housing washers and ball and cage assemblies with solid brass cages. The bearing parts are matched to each other and can be installed separately. Axial angular contact ball bearings are highly resilient, the contact angle is 60°. As a result, the very stiff axial ball bearings absorb high axial forces in both directions. The double-acting precision bearings are therefore particularly suitable for supporting precision spindles in machine tools. The axial ball bearing is arranged next to a double-row cylindrical roller bearing with a tapered bore, which absorbs the radial forces. Thrust ball bearings are available in two versions. The 2344 series can be installed on the small and the 2347 series on the large diameter of the shaft taper. These series have the same nominal outside diameter as the cylindrical roller bearings NN30..-AS-K. However, the tolerance of the outer diameter is defined in such a way that there is a fit when the seats of the thrust ball bearing and the cylindrical roller bearing are machined together. Axial angular contact ball bearings are open, i.e. not sealed. The bearings can be lubricated with oil or grease. Higher speeds are achieved with oil lubrication. The housing washer has a lubrication groove and lubrication holes so that the oil can flow between the two rows of balls. At high speeds, overlubrication of the radial bearing can be avoided if the installation space between the axial angular contact ball bearing and the cylindrical roller bearing is separate from one another. Axial angular contact ball bearings can be used at operating temperatures from -30 °C to +150 °C. Each row of rolling elements has a ball-guided solid brass cage. The cage is identified by the suffix M and, in addition to lubrication, has a significant influence on the speed suitability of the bearing.