Working under the sliding friction bearings. Sliding bearing stable, reliable, no noise. In liquid lubrication conditions, separated by sliding surface oil without direct contact, but also can greatly reduce the friction loss and surface abrasion, oil film also has a certain vibration absorption capacity. But the larger starting frictional resistance. Axle bearing portion is called the journal, and the journal match parts known as bush. Antifriction material layer in order to improve the bearing surface friction properties in the surface casting called bearing lining. Bearing and bearing lining materials are collectively known as the sliding bearing materials. Sliding bearing materials commonly used in bearing alloy (also called babbit alloy or alloy), cast iron, copper and aluminum alloys, powder metallurgy materials, plastic, rubber, wood and carbon - graphite. Many types of sliding bearing. According to the loading direction can be divided into radial sliding bearing and thrust (Xiang Xin) (Zhou Xiang) two types of sliding bearing. ② press lubricant type can be divided into oil lubricated bearings, grease lubricated bearings, the water lubricated bearings, gas bearings, solid lubricating bearings, magnetic fluid bearings and magnetic bearings 7 categories. ③ according to the lubrication film thickness can be divided into thin film lubrication bearing and thick film lubrication bearing two. According to the bearing materials can be divided into bronze bearings, cast iron bearing, plastic bearing, jewel bearing, powder metallurgy bearings, self-lubricating bearings and bearing etc.. And according to the bearing structure can be divided into round, elliptical bearings, bearing three oil Ye Zhoucheng, stepped surface of the bearing, the tilting pad bearings and foil bearing etc.. Sliding bearing at work because of shaft and bearing contact will cause friction, causing the surface heating, wear even "killed", so in the design of bearing, should choose the antifriction good sliding bearing material manufacturing bush, select the appropriate lubricant and the method to obtain suitable supplier, improve the thick film lubrication bearing structure.