High Speed Bearing Installation Method

Time：2021.08.19  Source：Roller Bearings Suppliers

The high speed, medium speed and low speed of the bearing are determined not by the speed but by the linear speed.Small bearings often return tens of thousands of revolutions is not a high-speed shaft answer, large bearings hundreds of revolutions are high-speed bearings.

The general high speed bearing refers to the bearing with a speed of 60 meters per second.In plain bearings, hydrostatic bearings, hydrodynamic bearings, pneumatic bearings, pneumatic bearings are suitable for high speed rotation.

While general rolling bearings adapt to low and medium speed rotation, if the use of rolling bearings high-speed rotation needs special requirements.The above bearings are easy to find in the national standard, and their types can be reasonably selected according to the load used and other factors.

If the speed is between 5 and 60 meters per second, it is not a high-speed bearing. General bearings can be satisfied as long as they can be lubricated.If higher speed bearings are used in some special occasions, such as high speed rotary shaft bearings used in high-speed cutting machine tools or precision machining machine tools can also use ceramic bearings, electric power, magnetic bearings and other special bearings.

Installation, coordination and adjustment of high-speed bearings:

1.Fit and clearance of high-speed bearings Because high-speed bearings should not only comply with the requirements of high-precision bearings, but also according to the requirements of high-temperature bearings, the following two points should be taken into account when considering their fit and clearance:

(1) change in size and hardness from room temperature to high temperature;Need WSBC 22224 E,click here to learn more.

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

In short, under the condition of high speed and high temperature, it is difficult to maintain the accuracy and performance of bearings from the choice of fit and clearance.

In order to ensure that the raceway deformation after bearing installation is small, the interference amount of interference fit can not be too large, and the centrifugal force at high speed and thermal expansion at high temperature, or offset the normal pressure of the mating surface.Therefore, the amount of interference must be calculated carefully on the premise of considering the above two factors. The effective amount of interference at normal temperature and constant speed may be invalid for high-speed bearings.

If the calculation results are too contradictory (usually only at ultra-high speed), only take the ring lubrication method and hydrostatic lubrication method of double lubrication measures, and this scheme may make the bearing DMN value to break through the 3 million mark.

Thermal expansion at high temperature, or offset with the normal pressure of the surface.Therefore, the amount of interference must be calculated carefully on the premise of considering the above two factors. The effective amount of interference at normal temperature and constant speed may be invalid for high-speed bearings.

If the calculation results are too contradictory (usually only at ultra-high speed), only take the ring lubrication method and hydrostatic lubrication method of double lubrication measures, and this scheme may make the bearing DMN value to break through the 3 million mark.

When considering high-speed bearing clearance, not only the above factors should be considered, but also the influence of thermal elongation of the shaft on clearance should be considered. The bearing is required to have the best clearance under working condition, that is, at working temperature, and this clearance is formed under the state of accurate positioning of the inner and outer ring ball groove centers.Because high-speed bearings strive to reduce the relative sliding and internal friction, it is best not to use the inner and outer ring along the axial relative dislocation method to adjust the clearance of ball bearings.

When considering the fit interference and clearance of bearings, it should be noted that the material becomes soft and easy to deform at high temperature, as well as the possibility of permanent deformation caused by repeated temperature changes from normal temperature to high temperature.Click here to learn more about WSBC 22226 E.

2. Requirements for related parts of the main engine

High-speed bearing requirements bearing in rotary system after dynamic balancing precision, shaft and hole bearing installation of the parts should be higher than the general requirements of dimensional accuracy, form and position accuracy, especially the alignment of hole or shaft neck and shoulder verticality, and considering these problems, also must pay attention to the high speed and high temperature factors in the operation of the bearing.

In order to overcome this contradiction, measures such as reducing surface roughness and improving surface strengthening can be taken to improve the stiffness of the support, and hollow shaft can be used to reduce the quality of the system.

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