What is the difference between rolling bearings and plain bearings?
Plain bearings (slidingbearing) bearings that work under sliding friction. The sliding bearing of stable and reliable operation, no noise in liquid lubrication conditions, separated by sliding surface oil without direct contact, but also can greatly reduce the friction loss and surface wear, the film also has a certain vibration absorption capacity. But the starting friction resistance is larger. The shaft supported by the bearing is called the journal, and the part that matches the journal is called the bush.In order to improve the friction properties of the bearing surface, the antifriction material layer, which is cast on its inner surface, is called the bearing lining. Bearing and bearing lining materials are collectively referred to as journal bearing materials. Sliding bearing materials commonly used in bearing alloy (also called Babbitt or white alloy), cast iron, copper and aluminum alloys, powder metallurgy materials, plastics, rubber, wood and carbon - graphite, PTFE (PTFE), modified Polyoxymethylene (POM), etc..
Plain bearing: a sleeve made of copper or porous iron (or copper) material. It has many kinds of structures. Rolling bearings, also called ball bearings, are made of steel balls. The shape and material of the two are obviously different
Sliding bearing applications are generally under low speed heavy load conditions, or maintenance and lubrication of the difficult parts of the operation. Radial bearings in rolling bearings (mainly bearing radial forces) are usually composed of 4 parts: inner ring, outer ring, rolling body and rolling body cage. The inner ring is tightly sheathed on the shaft neck and rotates with the shaft, and the outer ring is arranged in the bore of the bearing seat. In the inner and outer peripheral inner raceway are made. When the inner and outer rings rotate relative to each other, the rolling bodies roll on the raceway of the inner and outer rings, and they are separated by the cage to avoid mutual friction. The thrust bearing is divided into two parts: the tight ring and the movable ring. The tight ring is tight with the shaft sleeve and the movable ring is supported on the bearing seat. Rings and rolling bodies are usually made of rolling bearings steel with high strength and good wear resistance, and the surface hardness should reach HRC60 - 65 after quenching. The holder with mild steel punch made of copper alloy can also be used bakelite cloth or plastic manufacturing.
