The bearing is an important basic component of the shearer. Its function is to support the drive shaft and the parts on the shaft, keep the shaft at a certain working position, ensure the rotation accuracy of the shaft and reduce the friction and wear between the shaft and the bearing. The reliability and service life of the bearing have a great influence on the normal operation of the shearer. In recent years, in the use of coal mining machines, mechanical transmission system failures caused by bearing failures have increased, and even early damage to the bearings caused gears in the reduction box to be toothed and shafts stuck, forcing the coal mining machine to disintegrate and go to the well for maintenance, bringing production Serious loss. Therefore, how to improve the service life of the bearing has become an urgent problem to be solved for the working reliability of the shearer and the realization of high production and high efficiency at the fully mechanized mining face.