What is the bushing bearings?

What is the bushing bearings?
The term used for on-site construction or maintenance of mechanical engineering refers to the fact that when the rotating shaft is matched with the sliding bearing, the bearing bush of the sliding bearing outside the shaft is often called the bushing.
Note that it refers to sliding bearings, excluding rolling bearings.

Ring sleeves that act as gaskets In the field of valve applications, the bushings are inside the valve cover, and corrosion-resistant materials such as PTFE or graphite are generally used for sealing.

The bushing bearings made of anti-friction material in sliding bearing is also called bearing bushing and bushing. Usually cast on the inner surface of the bushing bearings, mainly to reduce costs and save valuable anti-friction materials. Thickness 0.5-6mm, for large size or important bearings. The bushing bearings is mainly used to replace the wear of the shaft, and also has the function of supporting the operation of the shaft, reducing friction and wear, and reducing vibration.

1) Gray cast iron, which is used in the case of low speed, light load and no impact load, commonly used HT15-33 and HT20-40.
2) Copper-based bearing alloys.
Commonly used are ZQSn10-1 phosphor-tin bronze and ZQA19-4 aluminum bronze, which are suitable for working at medium speed, high turbidity and impact load.
3) Oil bearing: Generally, it is a porous material formed by pressing bronze and cast iron powder with appropriate amount of graphite and sintering at high temperature.
Commonly used in low or medium speed, light load, inconvenient lubrication occasions.

4) Nylon.
Commonly used are nylon 6, nylon 66 and nylon 1010. Nylon bearings have the advantages of good running and smoothness, the soft surface of debris after wear does not damage the journal, and good corrosion resistance. The thermal conductivity is poor, and it will expand after absorbing water.
5) Bearing alloy (Babbitt).
It is an alloy of tin, lead, copper, antimony, etc. It has good wear resistance, but its strength is low, and it cannot be made into a bearing pad alone. It is usually cast on a bearing pad substrate such as bronze, cast iron, and steel.
6) Three layers of load bearing material.
There are two commonly used: Polypropylene fluoride steel body composite material and POM steel body composite material.

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