Home>Bearing knowledge>Wheel bearing unit seal layout analysis of national comparison test (2)

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Analysis of the comparison of the sealing of the hub bearing unit in the national standard (2)

Source: China Bearing Network Time: 2014-07-10

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Fourth, bearing seals Foreign and domestic bearing seal profiles have adopted a three-lip seal; but the layout type is not the same. Its different points are:
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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