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Analysis of the comparison of the national standard of the wheel bearing

Source: China Bearing Network Time: 2014-05-14

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First, the bearing oscillation acceleration bearing acceleration value is carried out on S0910 (III). Firstly, the oscillation acceleration value corresponding to the different steel ball of the wheel bearing is detected. From the perspective of the oscillation of the pass band; the uniform oscillation value of the domestic bearing is higher than that of the foreign The bearing height is 5. 8db, which is different from the same frequency band; the domestic bearing is significantly higher than the foreign bearing in the high frequency band. This is parallel with the ferrule two raceways, waviness, roughness, steel ball quality, bearing cleanliness. And many other elements are related.
Second, bearing clearance and rotation accuracy The axial clearance of foreign bearings is much smaller than that of domestic bearings. The rotation accuracy of foreign bearings is significantly higher than that of domestic bearing products. Bearing clearance and rotation accuracy have an important impact on sealing performance; The larger the gap; the lower the accuracy; the worse the sealing effect.
Third, bearing grease filling capacity of domestic bearings is 27% more than foreign bearings. Because it can not accurately calculate the net space inside the bearing; no known fat filling rate. But because the diameter of the steel ball of foreign bearings is large; the number of steel balls Less; seal skeleton steel plate. Resentment è±¢ è±¢ è±¢ è±¢ æº†Î¡ æº†Î¡ æº†Î¡ . . . . . . . . . . . . . . . ; ; ; ; ; ; ; ; ;.
Fourth, bearing seals The cross-sectional shape of foreign and domestic bearing seals is shown in Figure 1 and Figure 2. They all use a three-lip seal; however, the layout type is different.
The difference is:
1. The contact margin or the amount of gap between the three sealing lips and the slinger ring is different.
The seal interference of the foreign bearing 2 lip is sealed compared with the lip of the .3 lip; the interference of the lip is the same as that of the domestic bearing. As a whole, the foreign bearing is a low-torque seal; the conflicting torque, the interference, the touch force Both are more than a å²¢ Î¡ Î¡ Î¡ Î¡ Î¡ Î¡ ..
2. The difference in the layout of the seal 3 lip.
The direction of the lip of the foreign and domestic bearing seals 3 is opposite; and the gap between the lip of the foreign bearing seal 3 and the oil slinger is. When the bearing rotates; when the temperature rises; the gas pressure inside the bearing space must rise. In Figure 1; because there is a gap between the 3 lip and the slinger ring; the shape does not stop; when the pressure is relatively small; it will form a leakage channel through the 2 lip and the 1 lip, because the pressure difference between the surface is comparable. Cavity Hao. In Figure 2; when the pressure is relatively small; 3 lip seal interference will increase with the increase of pressure, when the pressure rises high enough; 3 lips will be pushed away when the sputum; through 2 lips And 1 lip constitutes a pressure leaking passage; pressure and grease will absorb the transient part of the leak.
3. Difference in the layout of the lip of the seal 1 The angle between the lip of the bearing seal and the axis of the bearing is larger than that of the bearing; although the touch is excessive and the bearing is flat; the touch area is larger; the touch is smaller. Reduce the conflicting moment; on the other hand, strengthen the sealing effect.
4, seal 2 lip layout difference Foreign bearing seal 2 lip root is thinner, thicker end; and the end contour is inclined upwards. Between 2 lips and 3 lips constitute a storage space. Domestic bearing 2 lip thickness Comparing evenly; the area between the 2 lips and the 3 lips can not function to store external muddy water and dust.
5, to resist the external mud, dust, the external mud, dust will enter through the gap 4; first stay in the space 1; after the space 1 is full; through the space 2, 3 into the bearing interior 4. Foreign bearing space 1, 2, 3 are There are storage functions; domestic bearings as long as the space 1, 3 has a storage function. Therefore, foreign bearings have a good ability to withstand external mud and dust.
V. Conclusion
1. The axial clearance of foreign bearings is comparable.
2. The grease filling capacity and fat filling rate of foreign bearings are at least 27% lower than domestic bearings; domestic bearing grease filling is more.
3, foreign and domestic bearings have adopted the three-lip seal and simmering oil ring type; but the layout of the three lips has a significant difference. Foreign bearing seals are low-torque seals; conflict torque is better. (4) å£¬ä¼² æ æ–“ æ–“ æ–“ç‰¡é’Ÿé¥«èŒ¨å˜Ÿ11. Page mirror which èŠ°Î“ ç¿ å†‰ å†‰ çŽ« çŽ« çŽ« çŽ« çŽ« çŽ« èŠ° èŠ° èŠ° èŠ° èŠ° èŠ° å›½å†… å›½å†… å›½å†… å›½å†… å›½å†… å›½å†… å›½å†… å›½å†… å›½å†… å›½å†… å›½å†… å›½å†… å›½å†… å›½å†… å›½å†… å›½å†… å›½å†… å›½å†… å›½å†… å›½å†… å›½å†… å›½å†… å›½å†… å›½å†… å›½å†… å›½å†… å›½å†… å›½å†… å›½å†… å›½å†… å›½å†… å›½å†… å›½å†… å›½å†… å›½å†… å›½å†… å›½å†…. However, because the conflicting moment is large and the temperature is raised; the grease is thinned, the pressure difference in the bearing table is increased; and the grease is filled too much; then the effect of avoiding grease leakage is weakened.

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