The role of the sliding bearing is to support the shaft from the bearing to be separated from the bearing seat to play the role of protection shaft and bearing seat, one of its important function is to reduce the friction coefficient and wear; sliding bearings according to the material and performance can be divided into Lubricated sliding bearings and general sliding bearings, self-lubricating sliding bearings in the course of work can be achieved without fuel or less fuel, and the general sliding bearing itself does not have a good lubrication function so the operation must be refueling.