oreign-bearing axial clearance is relatively small, high rotational accuracy is very beneficial to improve the sealing effect.

A foreign Backing bearings grease filling volume and filling at least 27% lower than the domestic bearings, fill the bearing internal fat percentage fat content higher than normal.
2 There are three domestic oil plus refusal ring bearing seal lip, but the lip structure, there are significant differences. Department of State Seal bearing seal is a low torque, the friction torque is small, less heat, has good resistance to external mud, dust capacity, but also a better ability to prevent oil leakage. Domestic bearing seal structure to resist external mud, dust, foreign matter worse than the ability to prevent grease leakage area is better, but the torque due to friction, temperature rise, so refined oils, bearing external pressure increases, excessive grease, plus loading, thus weakening the impact of grease to prevent leakage.