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Analysis of the types of sliding bearings

Author:admin   Date:2022-09-20
Sliding bearing is the contact part between the sliding bearing and the shaft. It is very smooth. It is usually made of wear-resistant materials such as bronze and anti-friction alloys. In special cases, it can be made of wood, plastic or rubber. Also called "bushing", the shape is a tile-like semi-cylindrical surface.
There are many types of sliding bearings:
①According to the direction that can bear the load, it can be divided into two categories: radial (radial) sliding bearing and thrust (axial) sliding bearing.​​
②According to the type of lubricant, it can be divided into seven categories: oil-lubricated bearings, grease-lubricated bearings, water-lubricated bearings, gas bearings, solid-lubricated bearings, magnetic fluid bearings and electromagnetic bearings.
③ According to the thickness of the lubricating film, it can be divided into two types: thin film lubricated bearings and thick film lubricated bearings.​​
④According to the bearing material, it can be divided into bronze bearings, cast iron bearings, plastic bearings, gemstone bearings, powder metallurgy bearings, self-lubricating bearings and oil-impregnated bearings.
⑤ According to the bearing pad structure, it can be divided into round bearings, elliptical bearings, three-oil vane bearings, stepped surface bearings, tilting pad bearings and foil bearings.

Bearings that work under rolling friction. Rolling bearings are easy to use and maintain, work reliably, have good starting performance, and have high bearing capacity at moderate speeds. Compared with sliding bearings, rolling bearings have larger radial dimensions, poorer vibration damping ability, lower lifespan at high speeds, and louder noises. The radial bearing in rolling bearing (mainly bearing radial force) usually consists of four parts: inner ring, outer ring, rolling body and rolling body cage. The inner ring is tightly sleeved on the journal and rotates with the shaft, and the outer ring is installed in the bearing seat hole. Raceways are formed on both 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 elements roll on the raceways of the inner and outer rings, and they are separated by the cage to avoid mutual friction. Thrust bearing is divided into two parts: tight ring and moving ring. The tight ring is tight with the shaft sleeve, and the moving ring is supported on the bearing seat. Rings and rolling elements are usually made of rolling bearing steel with high strength and good wear resistance, and the surface hardness after quenching should reach HRC60-65. The cage is mostly made of mild steel stamping, and can also be made of copper alloy cloth bakelite or plastic.

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