High-speed bearings during installation and fit issues to consider when

A high speed bearings fit and clearance according to both the high-speed  bearing requirements, but also according to temperature bearing requirements, so consider the coordination and clearance to take account of the following points:
(1) when the temperature rose to high temperature dimensional change and hardness;
(2) high speed, the centrifugal force caused by the force system change and shape change.

    In short, high-speed, high-temperature conditions, coordination and clearance from the choice of motor bearings should strive to maintain the accuracy and performance.

    In order to ensure the bearing raceway after installation of small deformation, interference fit amount of interference can not get too big, and high speed centrifugal force and high temperature thermal expansion, or offset with the surface normal pressure. Or so with the surface relaxation, so the amount of interference must be considered under the premise of these two factors to be carefully calculated, at room temperature under constant speed and effective amount of interference for high-speed bearings may be invalid.

     In considering the high speed motor bearing clearance only to consider the above factors, but also to consider the axis thermal expansion effects on the bearing clearance, bearing in working condition requires that there is at operating temperature optimum clearance, and this clearance is taken into account, the outer ring ball groove center precise alignment of state formation. As high-speed bearings for lower relative sliding and internal friction, it is best not to use the inner and outer rings relative axial displacement method to adjust the ball bearing clearance.

    In considering the amount of interference with the bearing and clearance, to note that materials at high temperatures becomes soft and easily deformed features, as well as many from the room temperature to high temperature changes cause some permanent deformation possibilities.

    (2) the requirement for host-related parts

    Where high-speed rotary motor bearings bearing system requires precision dynamic balancing shaft and the bearing seat hole installation site should have a higher than normal requirements of dimensional accuracy and geometrical precision, especially for concentricity and retaining shoulder seat hole or journal the vertical, and in consideration of these issues, it must also be noted that the high-speed operation of the bearing elements and high-temperature factor.