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Clearance is joint FAG bearings can be an important factor in works. Select suitable of bearing tour gap, can makes load in scroll body Zhijian distribution reasonable; can limit axis (or shell) of axis to and radial displacement to guarantee axis of rotating precision; makes joint FAG bearing in requirements of temperature Xia can normal work; can reduced FAG bearing work Shi of vibration and noise,, thus, bearing tour gap on bearing life, and temperature rose, and vibration and noise has is large of effect.
When choosing a joint FAG bearing clearance, in addition to bearing operating conditions (such as load, speed, temperature, etc) and on bearing performance requirements (such as friction torque, vibration and noise, running accuracy, and so on), you should consider the following:
1. Interference fit of the bearing and shaft and the case led to the reduction of clearance;
2. When bearing, inner and outer cylinder clearance reduction owing to the temperature difference;
3. Manufacture of shaft and housing materials clearance decreases or increases due to different coefficients of expansion.
Experience has shown that, FAG bearings for joints on the most appropriate operational clearance approximation to zero for roller bearings are the most suitable working conditions should be with a small amount of clearance. Request bearing rigidity in the good parts (such as machine tool spindles), can also have a certain number of pretension.
High precision bearing is refers to rotating precision, and shape size precision high and surface rough degrees smaller of bearing, in my of standard in the P4 level and than P4 level bearing, such as P2 level bearing for high precision FAG bearing, this generally and United States standard ABEC 7 and ABEC 9 quite, and international standards ISO P4 and P2 quite, international standards is many national recognized and used, as Japan, Germany and France,.
Through precise processing, various types of rolling bearings can be achieved high accuracy requirements, but in the application of high precision joints is most frequently used in bearings FAG bearings, high precision and high rigidity requirements of metal cutting machine tool spindle, double row cylindrical roller bearings are not small either, secondly they should taper roller bearings.
Currently, due to the joint development of processing technology of FAG bearings, precision bearings production errors at all levels below the international level in standard value ' one-second, such as the roundness of the ball joints FAG bearings for machine tool 0.3 μ m, and 0.25 per cent of the computers used in μ m.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 7218BDF NSK | 90 | 160 | 30 |
| 7218ADF NSK | 90 | 160 | 30 |