Q: What is sliding bearing and what is it's advantages and disadvantages?

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Sheng Yao Wang (Dalian) International Trade Co., Ltd.

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A: Sliding bearings work under sliding friction. Sliding bearings work smoothly, reliably and without noise. Under the condition of liquid lubrication, the sliding surface is separated by the lubricating oil without direct contact, which can also greatly reduce friction loss and surface wear, and the oil film also has a certain vibration absorption ability. However, the starting frictional resistance is large. The part of the shaft supported by the bearing is called the journal, and the part matching the journal is called the bearing bush. In order to improve the friction properties of the bearing pad surface, a layer of friction-reducing material cast on its inner surface is called a bearing bush. The materials of bearing pads and bearing bushes are collectively referred to as plain bearing materials. Sliding bearing applications are generally under high-speed and light-load conditions.

During the operation of the sliding bearing, due to the contact between the journal and the bearing pad, friction will occur, resulting in surface heating, wear and even "biting". Therefore, when designing the bearing, a sliding bearing material with good antifriction should be used to make the bearing pad. A suitable lubricant And adopt a suitable supply method to improve the bearing structure to obtain thick film lubrication.

1. Tile surface corrosion: Abnormal concentration of non-ferrous metal elements was found by spectral analysis; many sub-micron wear particles of non-ferrous metal components appeared in the spectrum; lubricant water exceeded the standard and acid value exceeded the standard.

2. Corrosion of journal surface: Spectral analysis found that the concentration of iron element is abnormal, there are many submicron particles of the iron component in the iron spectrum, and the lubricant water exceeds the standard or the acid value exceeds the standard.

3. The strain on the journal surface: There are iron-based cutting abrasive particles or black oxide particles in the iron spectrum, and the metal surface has a tempered color.

4. Fretting wear of tile back: Spectrum analysis found that the iron concentration was abnormal. There were many iron-containing submicron wear particles in the iron spectrum.

5. Bearing surface strain: Cutting abrasive grains are found in the iron spectrum, and the composition of the abrasive grains is a non-ferrous metal.

6. Tile surface exfoliation: Many large-scale fatigues exfoliated alloy wear particles and layered abrasive particles are found in the iron spectrum.

7. Bearing bushes: There are many large-size alloy abrasive particles and ferrous metal oxides in the iron spectrum.

8, bearing wear: due to the metal characteristics of the shaft (high hardness, poor concession) and other reasons, it is easy to cause adhesion wear, abrasive wear, fatigue wear, fretting wear, and other conditions.