Domestic bearing large compared what good or bad

Roller bearing  seal
Foreign and domestic bearing seal three lip seal, but the configuration is different. The difference is:
1, three oil ring seal or reject the amount of interference contact with different lip gap.
Bearing the seal lip two foreign interference smaller, three lip seal gap, a pair of the degree of interference with the domestic bearing equal lips. Overall, the foreign low torque, the friction torque of the bearing seal interference amount, the contact force is small, the bearing temperature should be lower than the temperature of bearings.
Two lip seals structural differences.
Foreign and domestic bearing seal lip opposite direction 3, and 3 and the annular space between the bearing oil seal lip rejected. When the bearing rotates, the temperature rises, the upside is bound to affect the gas pressure.
3, and the gap between the lip oil ring veto does not constitute an obstacle to the pressure more time, it will be formed by the two channels of the lips and lip leakage; such as internal and external pressure is relatively small, oil spill will be slow. In Figure 2, when the pressure is more time, the three lip seals amount of interference increases the pressure, when the pressure rises high enough, the three lips will drive a moment, 2, and 1 a pressure leak path Lip , pressure and concentration transient local grease will leak.
4, two lip seals structural differences
Two lip seals Roller bearingforeign roots thin and thick end of the final contour upwards. 23 storage space between the lip and lip. Two lips domestic bearing thickness, 23 lip lip and the area between the external memory is not going to realize the impact of cement dust.
5, on foreign soil, dust capacity
Foreign mud, dust into space 4, the first in space stranded ①, ① space is full, through the space ②, ④ ③ into the bearing. Foreign bearing space ①, ②, ③ with memory function, the only aerospace bearings ①, ③ storage capabilities. Therefore, to better resist foreign bearing external dirt, dust capabilities.