1. The co-ordination and speed of the bearing clearance due to the rapid bearing both precision bearings according to requirements, but also by high-temperature bearing requirements, so when considering their mating and clearance, to take into account the following points:

(1) changes in the size and hardness changes in temperature rose high temperatures; force system change (2) high speed and centrifugal force caused by the change in shape.

In short, at high speed, high temperature conditions, with and clearance from the choice you want to strive to maintain the accuracy and performance of the bearing, which is difficult.

In order to ensure the bearing raceway deformation after installation, interference interference fit can not achieve much, but the heat and the centrifugal force at high speed under high temperature expansion, surface or offset with normal pressure. Or the mating surface relaxation, and therefore the amount of interference must be calculated carefully in consideration of the above two factors under the premise of constant speed at room temperature under an effective amount of interference for high-speed bearings may be invalid.

If the result of this contradiction is too large (usually only in the ultra-high speed only in this case), only to take measures to double the lubrication ring lubrication method and hydrostatic lubrication and use, and this program has the potential to break through the bearing dmn value 3 million mark.

In considering the high speed bearing clearance only to consider the above factors, but also to consider the impact of thermal elongation axis clearance required bearing in working condition, that has the best clearance at operating temperature, and this Species clearance is included, the outer ball groove on the lower center of the state precisely formed. Since the high-speed bearings reduce internal friction and strive relative sliding, best not to use the inner and outer rings relative axial displacement method to adjust the ball bearing clearance.

When considering the amount of interference fit bearing and clearance, to note that the material becomes soft and easy deformation characteristics, as well as several from the normal to high temperature changes caused by the possibility of some permanent deformation at high temperatures.