The roller bearings are different from the ball bearings. The form of contact is line contact, which is different from the point contact of the ball bearings. Therefore, the rotation accuracy of the roller shaft is much complicated than the ball bearings. Here are some factors about rolling bearing rotation accuracy.
1. The impact of harmonic steps on bearing rotation accuracy
In the inner circle, the harmonic steps are 10th and 42 -order. The inner ring rotation of the bearing inner ring is rotated for a week. Among them, the amplitude of the roundness error is 0.010mm, the radial gap is 0.040mm, and the number of roller is the number of rollers is 10. It can be seen that as the harmonic steps increase, the cycle of the inner ring radial beating process decreases, the radial beating extreme point increases, and the amplitude of the inner ring -radial beating value is significantly reduced, so it can be seen that it can be seen Harmony steps have a greater impact on rotation accuracy.
The impact of harmonic steps on the maximum radial beating value of the inner circle, we can see that as the harmonic steps increase, the maximum radial beating value of the inner ring changes periodic changes; When the number is multiplied, the maximum radial beating value of the inner ring is a maximum value; the maximum value of the maximum radial jump value of the inner ring shows a decreasing trend with the increase of the harmonic order. It can be seen that the impact of low -order harmonics on rotation accuracy is greater, and the impact of high -end harmonics on accuracy is less. This is due to the outline of the low -order harmonic roller, and its harmonic section distance is greater than the diameter of the roller, so that the roller can roll from the peak of the low -order harmonic to the valley and reproduce the entire waveform of the low -order harmonic in the inside. In the process of circular radial beating, and for the outline with high -level harmonics, the harmonic section distance is less than the diameter of the roller, so that the roller can only reach the hormone peak part without touching the valley, which leads to low. High -level harmonics have a great impact on bearing rotation accuracy.
2. The effect of roundness error amplitude on the bearing rotation accuracy
The round degree error amplitude is 0.020mm and 0.060mm. The radial beating process is rotated for a week. It can be seen that with the increase of the amplitude of the roundness error, the inner ring radial beating value and its variable amplitude value have increased significantly, and the rotation accuracy of the bearing is also reduced.
The impact of the circular error amplitude on the maximum radial beating value of the inner ring. With the increase of the amplitude of the circular error amplitude in the inner ring, the maximum radial beating value of the inner ring shows a significant increase, which also reflects the inner inner The rounding error amplitude of the circular trail is one of the main factors that affect the rotation accuracy of the bearing.
3. The effect of roller number on the rotation accuracy of the bearing
The number of rollers is rotating within 8 and 14 o'clock for a week. The radial jump process is 0.010mm, the radial gap is 0.040mm, and the harmonic order is 2. It can be seen that with the increase of the number of rollers, the cycle and amplitude of the inner ring radial beating process have decreased.
The impact of the number of rollers on the maximum radial beating value of the inner ring, the maximum radial beating value of the inner ring gradually decreases with the increase of roller Ge Su, and the changing trend has gradually decreased with the increase of the number of rollers. And the changing trend is getting gentle, which indicates that the increase in the number of rollers with a small number of rollers can improve the rotation accuracy of the bearings. This is due to the increase in the number of rollers to reduce the span between the adjacent rollers, and at the same time, the number of rollers in the inner and outer ring roller increased.
4. The effect of radial gap on the rotation accuracy of the bearing
The radial gap is 0.02mm and 0.06mm. Among them, the amplitude of the circle error is 0.010mm, the harmonic order is 2, and the number of rollers is 10. It can be seen that as the radial gap increases, the cycle and amplitude of the inner ring radial beating process have no amplitude value. obvious change.
The effect of radial gap on the maximum radial beating value of the inner ring can be seen. The maximum beating value of the inner ring is increased as the radial gap increases, which is similar to the trend of linearly rising.
5. Summary conclusion
1) With the increase of the harmonic order, the amplitude of the radial beating value of the inner ring decreases, and the maximum radial beating value of the inner ring shows a decreased trend; At the same time, the maximum radial beating value of the inner ring reaches a large value.
2) With the increase of the amplitude of the circular error, the inner ring radial beating value and its amplitude value have increased significantly, and the maximum radial beating value of the inner ring shows a significant increase. The error amplitude is one of the main factors that affect the rotation accuracy of the bearing.
3) When the number of bearing rollers is small, the amplitude of the inner ring radial beating value decreases as the number of rollers increases, and the maximum radial beating value of the inner ring is gradually increased with the increase of the number of rollers. Decreased, and the trend of changes tended to gentle.
4) With the increase of the radial gap, the influence of the radial gap on the rotation accuracy of the bearing is very small, but it only increases the inner ring radial beating value.