Japan NSK has developed super easy sealed clean roll neck bearings. Such bearings under severe lubrication conditions, load capacity increased by 34%, and high reliability, long life and easy maintenance. This performance improvement is to optimize the mechanical design, the use of new materials and the results of sealing technology patent. Compared with the traditional roll neck bearing roll neck bearing this seal only basic dynamic load rating increased by 34%, and 2.7 times longer life. Super-capacity sealed clean roll neck bearing performance improved second factor is the use of NSK company developed the Super-TF bearing steel. This material solves the bearing life under contaminated or insufficient lubrication conditions. Experience has shown that pollution in the operating conditions, bearing vulnerable to debris intrusion and pollution. NSK's research shows that in polluted or edge lubrication conditions bearing life can be improved by improving the microstructure bearing steel. The new structure of the main seal and seal the hole sealed. Negative pressure generated in the bearing can cause water intrusion from the main sealing hole sealing structure has a great influence on the negative. Therefore, reducing the negative pressure in the bearing basic requirement is to prevent water from entering. The most effective way is to seal the hole not in direct contact with the water, while retaining hole sealed original function - to prevent water and dirt from the roll neck side intrusion. Sealing method using surface contact instead of line contact, whether it is during the operation, or static process, the surface of the contact hole seal has good sealing characteristics. Therefore, the new super-capacity sealed clean roll neck bearings than traditional sealed roll neck bearings have a higher reliability.
    In addition, SKF Italy sealed the company recently developed a new generation of oil and grease seals Mud Block. The optimum design of the seal structure can effectively prevent the intrusion of dirt. The traditional structure of a radial sealing lip, there is a garter spring and fixed between the outer diameter of the seal and seat. The new structure has a push baffle between the bushings and seals, seal the outer surface and an inner diameter of the rubber bushing, the inner lip with a waterproof grease pre-lubrication. Depending on the operating conditions and application requirements, Mud Block made available a variety of flexible materials. These materials include: nitrile, polyacrylic acid resin, fluorinated synthetic rubber