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According to the the Bearing Damage thermal resistance theory stage of analysis, the following conclusions can be drawn:
1 bearing inner ring and the shaft of the amount of interference is the decisive factor in the relationship bearing operating margin of safety. Selected amount of interference value should be made bearing has a sufficient margin to ensure disengaged from the inner ring and the shaft does not occur under normal operating temperature, the failure of the thermal resistance increases suddenly. Typically, the actual meaning of the choice of principle is: you should be able to meet in grease dropping point temperature, not the amount of interference of the inner ring and the shaft disappeared, and that the two should be matched with each other while preserving a little margin. In other words, the new high dropping point grease require interference become larger.
2. Prevent bearing means burning fault. Correct interference and will be converted to pre-heat source generation to prevent the failure of the bearing heating it: bearing temperature bearings allow the temperature rise should not exceed the upper limit: no more than allowed by the bearing grease temperature.
In summary, the amount of interference selected bearing inner ring, its minimum should also be in the grease dropping point slightly higher point within the range, the ensure interference fit properties unchanged, this minimum is bearing the critical amount of interference .
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 7018CTYNP5 NSK | 90 | 140 | 24 |
| 7017ATYNP5 NSK | 85 | 130 | 22 |