Slidingbearing， bearings that work under sliding friction.Under the condition of liquid lubrication, the sliding surface of the sliding bearing is separated by lubricating oil without direct contact, which can greatly reduce friction loss and surface wear, and the oil film also has a certain vibration absorption capacity.But the starting friction resistance is large.The part of the shaft supported by the bearing is called the journal, and the parts matching the journal are called the bushing.A layer of antifriction material cast on the inner surface of the bearing bush in order to improve its surface friction properties is called bearing lining.The materials of bearing bush and bearing lining are collectively referred to as sliding bearing materials.Commonly used sliding bearing materials are bearing alloys (also known as Babbitt or white alloy), wear-resistant cast iron, copper and aluminum based alloys, powder metallurgy materials, plastics, rubber, hardwood and carbon-graphite, polytetrafluoron (PTFE), modified polyformaldehyde (POM), etc.Sliding bearings are generally used in low speed and heavy load conditions, or in the operation parts where maintenance and lubricating oil filling are difficult.

The sliding friction between the running shaft and the shaft seat into rolling friction, so as to reduce the friction loss of a precision mechanical components, called rollingbearing.Rolling bearings generally consist of outer ring, inner ring, rolling body and cage.Is the role of the inner ring and shaft match with the shaft rotation, outer ring is used to match the bearing seat, a support role, rolling body is with the aid of maintains a uniform distribution of the rolling element between inner ring and outer ring, its shape size and quantity directly influence the using performance and life of rolling bearings, maintain uniform distribution can make the roller, prevent rolling body falls off,Guide the rolling body to rotate for lubrication.

Rolling bearings are easy to use and maintain, reliable to work, good starting performance and high bearing capacity at medium speeds.And sliding bearing rolling bearing rolling bearing radial size is large, poor vibration reduction ability, low life at high speed, large sound.The centripetal bearing of rolling bearing (mainly bearing radial force) is usually composed of inner ring, outer ring, rolling body and rolling body cage.The inner ring is tightly set on the journal and rotates with the shaft, and the outer ring is arranged in the bearing seat hole.Raceway is provided on the outer circumference of the inner ring and the inner circumference of the outer ring.When the inner and outer rings rotate relative to each other, the rolling body is the inner and outer ring of the raceway rolling, they are separated by the cage, to avoid mutual friction.Thrust bearing is divided into two parts: tight ring and loose ring.The tight ring is fastened with the shaft sleeve, and the living ring is supported on the bearing seat.The ring and rolling body are usually made of rolling bearing steel with high strength and good wear resistance. After quenching, the surface hardness should reach HRC60 ~ 65.The cage is mainly made of soft steel, and can also be made of copper alloy laminated bakelite or plastic.

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