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Installation Method Of High Speed Fag Bearing

High Speed Fag Bearing

nstallation and adjustment of high speed fag bearing:

1. Fit and clearance of high-speed fag bearing

since high-speed fag bearing shall meet the requirements of both high-precision fag bearing and high-temperature fag bearing, the following High Speed Fag Bearing two points shall be considered when considering its fit and clearance:

(1) Size change and hardness change from normal High Speed Fag Bearing temperature to high temperature;

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

In short, under the conditions of high speed and high temperature, it is High Speed Fag Bearing difficult to maintain the accuracy and working performance of fag bearing from the selection of fit and clearance.

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

If the contradiction between the calculation results is too large (usually only at ultra-high speed), only the dual lubrication measures of under ring High Speed Fag Bearing lubrication method and hydrostatic lubrication method can be adopted, and this scheme may make the DMN value of fag bearing break through the 3 million mark.

Thermal expansion at high temperature, or offset the normal pressure on the mating surface. Or relax the mating surface, so the High Speed Fag Bearing interference must be calculated carefully on the premise of considering the above two factors. The effective interference at room temperature and constant speed may be invalid for high-speed fag bearing.

Installation Method Of High Speed Fag Bearing

If the contradiction between the calculation results is too large (usually only at ultra-high speed), only the dual lubrication measures of under ring High Speed Fag Bearing lubrication method and hydrostatic lubrication method can be adopted, and this scheme may make the DMN value of fag bearing break through the 3 million mark.

When considering the clearance of high-speed fag bearing, we should not only consider the above factors, but also consider the influence of the thermal elongation of the shaft on the clearance. Fag bearing is required to have clearance under the working state, that is, under the working temperature, and this clearance is formed under the condition of accurate alignment of the ball groove centers of the inner and outer rings.

As high-speed fag bearings strive to reduce relative sliding and internal friction, do not use the method of High Speed Fag Bearing relative dislocation of the inner and outer rings along the axial direction to adjust the clearance of ball fag bearings.

When considering the fit interference and clearance of fag bearing, pay attention to the characteristics that the material becomes soft and easy to deform at high temperature, and the possibility of permanent deformation caused by multiple temperature changes from normal temperature to high temperature.

2. Requirements for relevant parts of main engine

The high-speed fag bearing requires the rotary system where the fag bearing is located to undergo precise dynamic balance.

The position where the fag bearing is installed on the shaft and seat hole shall have dimensional accuracy and form and position accuracy higher than the general requirements, especially the coaxiality and the perpendicularity of the shoulder to the seat hole or journal. When considering these problems, we must also pay attention to the high-speed and high-temperature factors during the operation of fag bearing.

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