1.FAG bearings with clearance due to FAG bearing according to both high precision bearing requirements, and according to the high temperature bearing requirements, so in consideration of its coordination and clearance, to consider the following two points:
( 1 ) changes in size and hardness changes from the normal temperature to high temperature;
( 2 ) changes in the system of forces and shape variation caused by the high speed centrifugal force.
In short, in the high speed, high temperature conditions, and with clearance from the selection of want to keep a bearing on the accuracy and performance, this is difficult.
In considering the FAG bearing clearance is not only to consider the various factors mentioned above, but also to consider the influence of thermal elongation axis on the clearance, bearing in working condition, which has the best clearance at operating temperature, this clearance is formed, the outer ring precision alignment, the ball groove center under the state. Because the FAG bearings to reduce the relative sliding and internal friction, clearance is best not to use methods, the outer ring along the axial relative displacement to adjust the ball bearing.
In considering the bearing with the amount of interference and clearance, should pay attention to the characteristics of material at high temperature become soft and easily deformed, possibility and many from the normal temperature to high temperature change caused by a permanent deformation.
2 of the host related parts requirements:
FAG bearing bearing the rotary system through the dynamic balance precision of the installation seat holes, shaft and bearing parts should be higher than the general requirements for the dimensional accuracy and the position accuracy, especially vertical concentricity and shoulder seat hole or shaft neck, and in considering these questions, must also pay attention to high-speed factors bearing operation and temperature factors.
Shaft bearing system requires high rigidity, and quality requirements as far as possible light, in order to overcome this contradiction, can take such as decreasing the surface roughness and surface strengthening measures to improve bearing stiffness, the hollow shaft in order to reduce the system quality.