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SKF bearing clearance is in the case of one ring fixed, another along the radial or axial rings made by the maximum amount of activity, so the clearance is divided into radial clearance and axial clearance of two. When the angular contact ball bearing Assembly, clearance must not be too large or too small. Clearance is too large will result in fewer scroll while loading from, a single rolling load increases, thus reducing the running accuracy of the bearing, reduced service life clearance is too small to pose increased friction and heat generated increases, increased wear, can also make FAG bearing service life is reduced. Therefore, during Assembly of the bearing is to be strictly controlled, and when adjusted clearance.
Preload is the NSK bearings at the time of Assembly, to the inner or outer rings of an axial force to eliminate the bearing clearance and rolling deformation in early contact with the inner and outer rings. Preload can increase stiffness and running accuracy of bearing in the State, as loading a large, rotating bearing with high accuracy requirements, mostly without clearance work there is even a small amount of interference, this case will need to be fitted when the bearings are tight.
Adjustment of the clearance and preload is usually through the appropriate inner ring external ring axial displacement method to complete. Technology concepts is easy to see from the above, through the Bias of ball bearing internal clearance adjustment, you can increase the carrying capacity and running accuracy of bearing, increase bearing service life. But at the same time to increase the bearing friction and heat increases, so you adjust the clearance or preload must ensure good lubrication and heat dissipation.
Approximately the speed required to repeat on behalf of cyclic running accuracy of "cycles", measure changes in the cycle amplitude, cyclic running accuracy is poor. Reduce a surface while increasing stiffness of the shaft a TIMKEN bearing system, minimum three and a maximum of three nearly equal distribution of the ball, but also improve the rotating accuracy of axis, and meets the accuracy requirements of instruments.
Within ring and axis take had Ying tie, had Ying volume 0~+4 μ m (in light load, and high precision Shi for 0); outer ring and bearing block hole take gap tie, gap volume 0~+6 μ m (but in free end of bearing using corner contact ball bearing Shi, also can increases gap); axis and block hole surface round degrees errors in 2 μ m following, INA bearing by with across ring of end surface parallel degrees in 2 μ m following, axis shoulder within end face outside end surface of beats in 2 μ m following; bearing block hole retaining shoulder on axis of beats in 4 μ m following ; Axis of the spindle within the front cover face of beats in 4 μ m.
Heating block hole make warming 20~30℃, with continuous gentle of pressure will bearing? axis combination body loaded seat hole; adjustment Qian cover, make Qian cover of tight solid volume for 0.02~0.05 μ m, to bearing block outside end surface for benchmark, will indicator of table head subject in axis neck surface Shang, will axis rotating measurement its beats, requirements errors in 10 μ m following; will indicator positioning in axis Shang, table head subject Hou block hole within surface, will axis rotating to measurement bearing block before and after block hole of with axis degrees.
In NN3000K series cone when Kong Shuang-row cylindrical roller bearings, care must be taken to KOYO bearing inside diameter and shaft taper right coincide, in the case of production less available touch painting method validation, but in the production lot is large, the best precision taper gauges calibration.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 32910XU NTN | 50 | 72 | 15 |
| 32309U NTN | 45 | 100 | 36 |