The import of bearing  clearance

Due to the high speed bearings both high precision NSK bearing according to request, and high temperature bearing according to requirements, so in considering the coordination and clearance, want to attend to the following two points:

(1) that the normal temperature high temperature changes to the size of the hardness change;

(2) high speed centrifugal force caused by the force system change and change shape.

In short, at high speed, high temperature conditions, from coordination and clearance to strive to keep on the choice of the precision of the bearing and working performance, this is difficult.

In order to guarantee FAG after installation way of rolling bearing little deformation, made of surplus quantity with can't get too big, and high speed centrifugal force under the high temperature and the thermal expansion, or offset surface to the method with the pressure. Or make face with flabby, so a surplus quantity must consider the above two kinds of factors in the premise of prudent to calculation, in room temperature often valid under the speed over surplus quantity for high-speed bearing may is invalid.

If the calculation results this contradiction is too large (usually only in ultrahigh speed to have this kind of situation), only to take the ring with static pressure lubrication method lubrication method and dual lubrication of the measures, but the plan may make bearing DMN value of 3 million big breakthrough close.

In considering the SKF bearing clearance when not only consider the above factors, but also to consider axle hot elongation to the influence of the clearance for bearing in the working status, that is, in the best operating temperature of the clearance, and the clearance is, and outer ball groove center accurate registration under the condition of the form. Due to the high speed bearings to reduce the relative sliding and internal friction, had better not use the inner and outer along the axial relative displacement of methods to adjust the ball bearing clearance.

 
In consideration of the INA bearing with a surplus quantity and clearance, we should pay attention to the material under high temperature to become soft and easy to deformation characteristic, as well as several times by the temperature of the room temperature to temperature changes cause certain the possibility of permanent deformation.
 



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