When the roller bearing is working, the stick does pure flip fitness movement in the inner and outer ring raceway, so the support frame that pushes the roller must have sufficient drag force to get rid of friction resistance. If the drag force is not enough to get rid of friction, then the roller will roll on the dovetail rail, resulting in a speed difference, which is the deviation. So what should we do when we run against roller bearings? Below I for you to produce these common moves to solve and avoid roller bearings running deviation.

Roller bearing

1, reduce the number of rollers and reduce the diameter of rollers

Roller is held by the rotating ring, under the condition of compressive strength tolerance, reduce its net weight, so as to reduce the inertia force friction resistance. It is increasingly critical to avoid and reduce scrolling. This strategy is easy to choose, just reduce its total number and diameter can be done. In airline turbines, contact fatigue is not the key factor of roller failure because of the characteristics of small external loads. According to the basic standard bearing specifications of redundancy or large, it is generally felt that the total number of rollers is reduced by 50%, and the diameter is reduced by 25%, still does not harm its contact fatigue service life. Many automobile engines have adopted this strategy, for example, speis engine main bearing is this type, not only a significant number of rollers, and exquisite specifications.

2. Select the effective structure and relieve the net weight of the cage

In addition to avoiding its net weight as far as possible under the condition of allowable compressive strength, the cage should also take into account its own characteristics, such as co-vibration and friction resistance during high-speed operation.

The correct guide method of cage is also a very key element in fast bearing. If the height of the cage is properly controlled, it is also beneficial to change the cage from the outer correct guide to the inner correct guide in order to reduce the deviation. Due to the relative speed between the correct guide surface of the cage and the correct guide surface of the bearing, the sliding oil slick produces a viscous friction resistance, while the correct guide surface of the inner is the opposite, the viscous force between the cage and the correct guide surface of the sliding oil slick becomes the drag force. In this way, the viscous friction becomes the force that drags the cage around. The difference between the two cannot be ignored.

3. Oil provided under the ring

The advantage of selecting the oil provided under the ring is to bring about the bearing's heating, while at the same time minimizing the additional damage caused by mixing. For example, if the outer loop with a retaining edge is changed to the inner loop with a retaining edge, there is no doubt that the friction resistance of mixing can be reduced, as shown in Figure 4.

4. Hollow roller preload bearing is selected

Hollow roller preload bearing can increase the preload of all rollers, so that there is no rolling in all areas. Because the turbine motor rotor bearing work transfer ratio and temperature range is relatively wide, so the selection of suitable preload should be careful. Too much preloading can cause the roller to fail too early, even at very low additional loads. The common mode of destruction is bending fatigue. For typical hollow rollers, the ratio of diameter to diameter 2 shall be less than 25,000 lb/ft. The coaxiality of inner and outer diameter should be maintained at 0.005mm.

5, choose elliptical bearing

Elliptic bearing is the most common ground anti-skid way, generally has two and three valves two structures. Take double disc elliptic bearing as an example, talk about its structure and ground anti-skid principle. The diameter of the outer ring of this kind of bearing is generally elliptical, and the inner diameter of the outer ring (raceway) and the bearing seat are circular. After installation, the outer loop raceway becomes elliptical, that is, the roller is preloaded. In other words, the axial backlash between the roller and the dovetail guide at the short drive shaft of the ellipse dovetail guide is cleared (resulting in clearance fit), so that the roller suffers from shrinkage. Therefore, in addition to the bottom of a lot of rollers subjected to the motor rotor force load, in its left and right 90° of the roller, also by a certain amount of pre-loading, so that the number of rollers to bear the load up to about 60% of the number of rollers (roller bearings generally bear the load of rollers accounted for about 20% of the number of rollers). Therefore, improving the driving force of towing is beneficial to avoid roller and cage deviation. However, the way to obtain the ellipticity will reduce the fatigue service life of the bearing, therefore, in the application must take into account the selection of the ellipticity problem.

Above is the solution of roller bearing deviation, everyone is clear? If you also want to master a lot of news and information about bearings, you can pay more attention to your website. If you must choose bearings, technical professional bearing manufacturers give you concave groove ball bearings, cone roller bearings, buffer roller bearings, self-aligning ball bearings, warmly welcome to buy.