How is the accuracy of the bearing specified?
wallpapers Products 2020-07-29
The accuracy of rolling bearings is divided into dimensional accuracy and rotation accuracy. The accuracy level has been standardized, divided into six levels: 0, 6X, 6, 5, 4, and 2. The accuracy is increased sequentially from level 0, which is sufficient for general purpose level 0, but when used in the conditions or occasions shown in Table 1, accuracy of level 5 or higher is required. Although the above accuracy grades are based on ISO standards, their names differ in national standards. Dimensional accuracy (items related to shaft and housing installation) 1. Permissible deviations of inner diameter, outer diameter, width and assembly width 2. Permissible deviations of the inner and outer round diameters of the roller set 3. Allowable chamfer size Limit value 4. Allowable variation of width Rotation accuracy (items related to the runout of rotating body) 1. Allowable radial and axial runout of inner ring and outer ring 2. Allowable lateral runout of inner ring 3. Inclination of outer diameter The allowable variation of the degree 4, the allowable variation of the thickness of the thrust bearing raceway 5, the allowable deviation and allowable variation of the tapered hole, the bearing type and the applicable accuracy class, the applicable standard, the applicable accuracy class, and the deep groove ball bearing GB307 0 level 6 5 Grade 4 Grade 2 Angular Contact Ball Bearing Grade 0 Grade 6 Grade 5 Grade 4 Grade 2 Spherical Ball Bearing Grade 0 Cylindrical Roller Bearing Grade 0 Grade 6 Grade 5 Grade 4 Grade 2 Tapered Roller Bearing Metric Series (Single Row) GB307 0 Grade 6 Grade 6 Grade 5 Grade 4 Metric Series (Double Row, Four Row) SB/T5341994 Grade 0 Inch Series SB/CO/T1089 Class4 Class2 Class3 Class0 Class00 Spherical Roller Bearing GB307 Class 0 Thrust Ball Bearing Class 0 Class 6 Grade 5 and Grade 4 thrust spherical roller bearings Grade 0 GB/T30794 standard divides the bearing grade into GEDCB. The comparison of ISO, JIS and other standards is as follows: Standard accuracy GB/T30794 BCDEG ISO CLASS2 CALSS4 CLASS5 CLASS6 NORMAL CLASS DIN P2 P4 P5 P6 P0 ANSI ABEC9 ABEC7 ABEC5 ABEC3 ABEC1 JIS JIS2 JIS4 JIS5 JIS6 JIS0 Accuracy selected performance requirements Application examples Applicable accuracy level requirements The placement body has high beating precision audio and video machine spindles (video recorders, tape recorders) radar, parabolic antenna rotating shaft machine tool spindle electronic computer, disk spindle aluminum foil roll neck multi-stage rolling mill support bearings P4 P5, P4, P2, ABEC9 P5, P4, P2 , ABEC9 P5 P4 high-speed rotary turbocharger jet engine main shaft, auxiliary machine centrifugal separator LNG pump turbo molecular pump main shaft, protective bearing machine tool main shaft tensioner P5, P4 P5, P4 P5, P4 P5 P5, P4 P5, P4 , P2, ABEC9 P5, P4 require small friction and friction change control machine (synchronous motor, servo motor, gyro gimbal) Metering machine tool spindle P4, ABMA 7P P5 P5, P4, P2, ABEC9 General precision small motor, gear drive Device, cam gear, generator, low-induction synchronous servo motor, pressure rotor, printer, copier, testing instrument P0, P6