What kind of mistakes can be taken to prevent full complement cylindrical roller bearings from slipping? 1. Reduce the number of rollers and reduce the diameter of the rollers. The rollers are run by the torsion ring. If the strength allows, reduce its weight and achieve the goal of reducing inertial resistance. Getting very nervous about guarding and reducing slippage. Accommodating this miss is simpler and requires only a reduction in its number and diameter. In the aviation turbine engine, because of the small external load, contact fatigue is not the main damage component of the drum. According to the general standard bearing size allowance or large, it is generally felt that the number of rollers is reduced by 50%, and the diameter is reduced by 25%, it still does not affect its contact wear life. Many engines have accepted this mistake, for example, the main bearing seat of the Spey engine is this type, not only the rollers are obviously rare, but also the size is small. 2. Select a reasonable layout and reduce the weight of the cage In addition to reducing its weight when the strength allows, the cage should also consider its own characteristics, such as resonance and high-speed torsional resistance should be avoided. The cage guide method is also a very important component in the high-speed housing. If the unsatisfactory measurement of the cage is stable, changing the cage from outer guidance to inner guidance is also very beneficial for reducing slippage. Because of the outer guide, the comparative movement between the cage and the guide surface of the bearing, the lubricating oil film forms a viscous resistance one by one, while the inner guide is the opposite, and the viscous force of the lubricating oil film between the cage and the guide surface becomes a drag force. As such, the viscous resistance causes the force that drags the cage to twist. The difference between the two cannot be ignored. 3. The advantage of under-ring oil supply using under-ring oil supply is to take away the heat of the bearing seat, and at the same time, the extra loss caused by stirring is very small. Another example is to change the outer ring belt rib to the inner ring belt rib, which can undoubtedly reduce the resistance of stirring. 4. Accept the hollow roller preload bearing and the hollow roller preload bearing. It preloads all rollers so that all areas are slip-free. Because the working speed and temperature of the rotor bearing of the turbine engine are limited, the selection of the appropriate preload should be careful. Even at very low applied loads, excessive preload can still cause premature failure of the drum. The most common form of damage is bending and fatigue. For a typical empty drum, the ratio of outer diameter to inner diameter is 2, and the bending stress of very large holes should be less than 25,000 psi; the concentricity of the outer and inner diameters should be maintained at 0.005 mm. 5. The use of elliptical bearings to use elliptical bearing housings is a very common anti-skid form, and there are generally two types of knots: double-lobed and three-lobed. Take the double-lobed elliptical bearing as an example to talk about its layout and anti-skid mechanism. The outer diameter of the outer ring of this kind of bearing is generally elliptical, and the inner diameter (raceway) of the outer ring and the bearing seat are all circular. After the installation, the outer ring raceway is formed into an ellipse, that is, a preload is added to the drum. That is to say, the radial clearance between the roller and the raceway at the short semi-axis of the elliptical raceway is eliminated (interference is formed), and the rollers are compressed. Therefore, in addition to the benefits of the rotor's gravity load on the very lower rollers, the rollers at 90° to the left and right are also preloaded with a certain amount of preload, so that the number of rollers under load increases to 90 degrees. About 60% of the total number of columns (the number of rollers that are generally loaded with full complement cylindrical roller bearings accounts for about 20% of the total number of rollers). Therefore, increasing the drag force is beneficial to prevent slippage of the roller and cage. However, the technique of giving ovality will reduce the service life of the bearing seat, so there is a need to consider the selection of the best ovality in the application.
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