With the adjustment of the high speed bearing installation:

1 high-speed bearings with clearance due to the high speed and high precision bearings, bearing not only according to requirements, but also by high temperature bearing requirements, so consider the fit and clearance, to consider the following two points:

(1) change from room temperature to changes in the size and hardness at high temperature;

(2) force line change and shape change under high-speed centrifugal force caused by.

In short, in the high speed, high temperature conditions, and with clearance from theselection of want to maintain the bearing accuracy and performance, this is difficult.

In order to ensure the bearing after installation of the rolling deformation is small, the amount of interference can not fit the too big, and high-speed centrifugal force and under the high temperature thermal expansion, or set off with the normal surfacepressure. Or is the mating surface relaxation, so the amount of interference must be in consideration of the above two factors under the carefully calculated, the effectiveamount of interference may be ineffective for high-speed bearing at normal temperature and velocity.

If the results of this contradiction is too large (usually have only in the ultra high speed), only to take double lubricating measures ring lubrication and lubricationmethod and use, mark and this scheme is likely to make bearing DMN value above 3000000.

High temperature thermal expansion, or set off with the normal surface pressure. Or isthe mating surface relaxation, so the amount of interference must be in consideration of the above two factors under the carefully calculated, the effective amount of interference may be ineffective for high-speed bearing at normal temperature andvelocity.

If the results of this contradiction is too large (usually have only in the ultra high speed), only to take double lubricating measures ring lubrication and lubricationmethod and use, mark and this scheme is likely to make bearing DMN value above 3000000.

Considering the high speed bearing clearance not only to consider the various factors mentioned above, but also to consider the impact of thermal elongation axis on theclearance, requirements of the bearing under the working state, which has the bestclearance at operating temperature, this gap is formed in the inner, outer ball groove center precision condition. Due to the high speed bearings to reduce the relative sliding and internal friction, clearance is best not to use methods within the outer ringalong the axial direction, relative displacement to adjust the ball bearing.

In considering the bearing interference fit and clearance, should pay attention to the characteristics of material at high temperature has become soft and easy to deformation, and the possibility of many from the normal temperature to high temperature change caused by a permanent deformation.

2 of the host related parts requirements

High speed bearings require bearing the rotary system through the dynamic balanceprecision, shaft and hole installation of bearing parts should be higher than thegeneral requirements for accuracy of size and form, especially the concentricity andverticality abutment seat hole or shaft neck, and in considering these questions, must also pay attention to high speed factors bearing in operation and the temperature factor.

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 the supporting stiffness, the hollow shaft to reduce the system quality.