sliding bearing

A sliding bearing, a bearing operating under sliding friction. The sliding bearing is stable and reliable, the noise-free sliding bearing is separated from the lubricating oil without direct contact under the condition of liquid lubrication, and the friction loss and the surface abrasion can be greatly reduced, and the oil film also has certain vibration absorbing capacity. But the starting frictional resistance is large. The part of the shaft that is supported by the bearing is referred to as a journal and the part to be fitted with the journal is referred to as a bearing pad. An anti-friction material layer cast on its inner surface in order to improve the frictional properties of the surface of the bearing bush is referred to as a bearing liner. The material of the bearing bush and bearing lining is generally referred to as a sliding bearing material.

The conventional sliding bearing materials are alloy (also called babbitt or white alloy), wear-resistant cast iron, copper-based and aluminum-based alloys, powder metallurgy materials, plastics, rubber, hardwood and carbon-graphite, polytetrafluoroethylene (PTFE), modified polyoxymethylene (POM), and the like. The application of the sliding bearing is generally under the condition of low-speed and heavy-load working conditions, or is the operating part for maintaining and filling the lubricating oil.

The sliding friction between the running shaft and the shaft seat becomes a rolling friction, so that a precise mechanical element, called rolling bearing, of the friction loss is reduced. The rolling bearing is generally composed of an outer ring, an inner ring, a rolling body and a retainer. wherein the inner ring is matched with the shaft and rotates together with the shaft, the outer ring is matched with the bearing seat to support the bearing, the rolling body is evenly distributed between the inner ring and the outer ring by means of a retainer, The shape and the number of the rolling elements directly influence the service performance and the service life of the rolling bearing, the retainer can uniformly distribute the rolling bodies, prevent the rolling bodies from falling off, and guide the rolling bodies to rotate to lubricate the rolling bodies. rolling bearing The rolling bearing has the advantages of convenient maintenance, reliable work, good starting performance and high bearing capacity at medium speed. Compared with the bearing of the sliding bearing rolling bearing, the rolling bearing has the advantages of large radial dimension, poor vibration damping capacity, low service life at high speed and large sound.

The radial bearing in the rolling bearing (mainly bearing radial force) is usually composed of an inner ring, an outer ring, a rolling body and a rolling body holder 4. The inner ring is tightly sleeved on the journal and rotates with the shaft, and the outer ring is arranged in the bearing seat hole. And the inner periphery of the inner ring and the inner circumference of the outer ring are provided with a raceway. When the inner and outer rings are relatively rotated, the rolling bodies roll on the rolling channels of the inner and outer rings, and the rolling bodies are separated from the holder so as to avoid mutual friction. The thrust bearing is divided into two parts. And the tension ring is tightly connected with the shaft sleeve, and the movable ring is supported on the bearing seat. The ferrule and the rolling body are usually made of rolling bearing steel with high strength and good wear resistance, and the hardness of the surface after quenching shall reach HRC60 ~ 65. The holder is made of multi-purpose soft steel, and can also be made of copper alloy, bakelite or plastic.