Sliding bearing is a rolling bearing working under sliding friction. The rolling bearing is stable, reliable and noiseless in operation. Under the liquid lubrication standard, the drag surface is separated by grease without immediate touch, which can greatly reduce friction damage and surface damage. The oil film also has the necessary vibration absorption ability.

But the starting friction is very large. The shaft is called the journal by a part of the rolling bearing support plate, and the parts matched with the journal are called the bearing bush. In order to improve the friction characteristics of the surface layer of the bearing bush, the antifriction raw material layer cast on the inner surface layer is called the rolling bearing liner. The raw materials of bearing bush and rolling bearing liner are generally called rolling bearing raw materials. Common rolling bearing raw materials include bearing alloy (also known as Babbitt alloy or white aluminum alloy), wear-resistant cast iron, copper and aluminum based alloys, powder metallurgy materials, plastics, vulcanized rubber, mahogany and carbon high-purity graphite, PTFE (PTFE), modified material Polyoxymethylene (POM), etc.

The application place of rolling bearing is usually under the standard of low-speed gear and heavy load, or the operation position where maintenance and grease filling are difficult. Rolling bearing is usually composed of outer ring, inner ring, turnover body and retaining structure. At least the function of the inner ring is to cooperate with the shaft and rotate together with the shaft. The function of the outer ring is to complement the bearing with seat and play the function of supporting point. The turnover body is evenly distributed between the outer ring and the outer ring by virtue of the cage. Its appearance, size and total number immediately endanger the performance index and service life of the roller bearing. The cage can make the turnover body jointly distributed, Prevent the turnover body from falling down, correctly guide the rotation of the turnover body and have the effect of moistening.

The roller bearing has the advantages of convenient application and maintenance, reliable operation, good starting characteristics and high bearing capacity at medium horizontal speed. Compared with rolling bearings, roller bearings have large axial specifications, weak damping capacity, low service life and loud noise at high speed. The radial bearing in the roller bearing (the key bearing axial force) is generally composed of inner ring, outer ring, turnover body and turnover body cage 4.

The inner ring is tightly sleeved on the journal and rotates with the shaft, and the outer ring is installed in the bearing hole with seat. A raceway is arranged on the outer circumference of the outer ring and the inner circumference of the outer ring. When the inner and outer rings rotate relatively, the turnover body, that is, the raceway of the outer ring, turns over. They are separated by the cage to prevent mutual friction. The thrust bearing is divided into two parts: tight ring and movable ring.

The tightening ring is tight with the shaft sleeve, and the movable ring support plate is on the bearing with seat. The ferrule and turnover body are generally made of roller bearing steel with high compressive strength and good wear resistance. The surface strength after heat treatment shall exceed HRC60 ~ 63. The cage should be made of mild steel stamping die, and can also be made of alloy copper cloth, bakelite or plastic. The difference between roller bearing and rolling bearing lies in the structure. Roller bearing supports the rotating shaft by the rotation of turnover body. Therefore, the touch position is a point. The larger the turnover body is, the more contact points are; The rolling bearing supports the point rotating shaft by a linear surface, so the contact position is one surface.

Secondly, the fitness method is different. The fitness method of roller bearing is turnover; The fitness method of rolling bearing is dragging, so the friction method is completely different. When the equipment has been used for a long time and needs to be replaced with a new bearing bush, in order to make the bearing bush and journal cooperate well with each other, scrape the inner surface of the bearing bush with a scraper to make the bearing bush and journal have a large total contact area.

The scraping should be carried out by skilled technicians to ensure the maintenance quality.