The precision of the bearing

The bearing level of accuracy and precision of the rolling bearing points ( The main) Dimensional accuracy and rotation accuracy. Precision grade has been standardized, divided into a level 0, 6 x, 6, 5, 4, 2 levels of six grades. Since a level 0, in turn, improve accuracy, for general purpose level 0 is enough, but in used are shown in table 1 conditions or situations, needs to be level 5 or higher precision. Although more accuracy grade is set by the ISO standards as a benchmark, but its name is different in the national standard. Table 2 lists the various bearing type applicable level of accuracy as well as the comparison between international standards. Dimensional accuracy ( Associated with the axis and shell installation project) 1, inner diameter, outer diameter, width and assembly width within the allowable deviation of 2, the roller group months-moons last contact outside diameter and the diameter of the allowable deviation 3, acceptable limit value of the chamfer size 4 rotating accuracy, width to allow changes ( Projects related to the rotator to beat) 1, inner ring and outer ring radial runout and axial runout 2, without the permission of the inner ring allows transverse beating 3 plane inclination to allow change quantity, diameter 4 and the change of the thickness of the thrust bearing raceway allowed quantity 5, to allow the taper hole deviation and allowed to change the size of the quantity of all kinds of bearing accuracy and rotation accuracy as shown in table 3-6. Chamfer size threshold value as shown in table 7. Table 1 precision bearing case performance requirements use case applicable precision grade requirements placed body with high precision beating audio, video machine spindle ( Video recorder, recorder) Radar, parabolic antenna axis of machine tool spindle's computers, disk aluminum foil roll neck multi-stage rolling mill bearing P4P5, P4, P2, ABEC9 P5, P4, P2, ABEC9 P5P4 high-speed rotating turbo jet engine main, auxiliary engine centrifuge liquefied natural gas pump turbo molecular pump, protect bearing spindle of machine tool spindle tension wheel P5, P4P5, P4P5, P4 P5P5, P4P5, P4, P2, ABEC9P5, P4 friction and low friction change control machine ( Synchronous motor, servo motor and gyro gimbal) Measuring instrument spindle P4, 7 pp5p5 ABMA, P4, P2, ABEC9 table 2 bearing type and suitable for precision bearing form applicable standards level reference table - deep groove ball bearings GB3070 level Level 6 grade 5 grade 4 level 2 level 0 - angular contact ball bearing Level 6 grade 5 grade 4 level self-aligning ball bearing level 0-2 - - - - Table 3 cylindrical roller bearing level 0 - Level 6 grade 5 grade 4 level 2 metric tapered roller bearing series ( Single row) GB307SB/T53419- 94某人/公司/ T10 - 89 levels 0 6 x 6 grade level 4-5 Metric series (table 4 Double row and four columns) Level 0 - - - - - - - - - - - - - - - - - - - - Class4 - inch series GB3070 level - Class2Class3Class0Class00 spherical roller bearing - - - - - - - - - - - - - - - - - - - - - - - - Table 3 level 0 - thrust ball bearing Level 4-6 level 5 Thrust spherical roller bearing level 0 - table 5 - - - - - - - - - - - - - - - - - - - - - - - - Table 6