Sliding bearing overview

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Sliding bearing overview

Source: China Bearing Network Time: 2018-06-29
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Sliding bearing; bearing working under sliding conflict. Sliding bearing works smoothly, firmly and without noise. Under liquid smooth condition; sliding surface is separated by smooth oil without direct touch; can also be greatly reduced Collision loss and appearance wear; oil film also has a certain vibration absorption ability. However, the resistance of starting conflict is large. Some of the shafts are supported by bearings, which are called journals; the parts with shafts are called bearing bushes. In order to improve the conflicting nature of the bearing surface. The anti-friction material layer cast on the inner and outer surfaces is called the bearing lining. The data of the bearing bush and the bearing lining are collectively referred to as the sliding bearing data. The commonly used sliding bearing materials are bearing alloy (also known as babbitt or white alloy), wear-resistant cast iron. , copper-based and aluminum-based alloys, powder metallurgy materials, plastics, rubber, hardwood and carbon-graphite; polytetrafluoroethylene (Teflon, PTFE), modified polyoxymethylene (POM), etc.
Sliding bearing applications are usually used under low speed and heavy load conditions; or it is difficult to protect and fill smooth oil.
The principle can be divided according to the working principle of the bearing: rolling conflict bearing (rolling bearing) and sliding conflict bearing (sliding bearing).
Sliding bearing: If the outer surface of the sliding bearing can form a smooth film to separate the outer side of the moving pair; the sliding conflict force can be greatly reduced; because the outer surface of the moving pair is not directly touched; thus the wear is avoided. The bearing capacity of the sliding bearing can be large; High precision; smooth film has anti-impact effect; thus; has been widely used in engineering.
The composition of the smooth film is the basic condition for the normal operation of the sliding bearing; the elements affecting the smooth film have a smooth method, the relative motion speed of the motion pair, the physical properties of the smoothing agent, and the roughness of the outer surface of the moving pair. The drawing of the sliding bearing should be based on Bearing operating conditions; determine the type of bearing layout, select smoothing agent and smooth method and determine the parameters of the bearing.
There are many varieties of classified sliding bearings.
1 According to the direction of the load can be divided into radial (central) sliding bearings and thrust (axial) sliding bearings.
2 according to the smoothing agent varieties can be divided into oil smooth bearings, grease smooth bearings, water smooth bearings, gas bearings, solid smooth bearings, magnetic fluid bearings and electromagnetic bearings.
3 according to the smooth film thickness can be divided into two types: thin film smooth bearing and thick film smooth bearing.
4 According to the bearing material, it can be divided into bronze bearing, cast iron bearing, plastic bearing, gemstone bearing, powder metallurgy bearing, self-smooth bearing and oil bearing.
5 according to the bearing tile layout can be divided into round bearings, elliptical bearings, three oil leaf bearings, step surface bearings, tilting pad bearings and foil bearings.
There are many varieties of layout sliding bearings.
1 According to the direction of the load can be divided into radial (central) sliding bearings and thrust (axial) sliding bearings.
2 according to the smoothing agent varieties can be divided into oil smooth bearings, grease smooth bearings, water smooth bearings, gas bearings, solid smooth bearings, magnetic fluid bearings and electromagnetic bearings.
3 according to the smooth film thickness can be divided into two types: thin film smooth bearing and thick film smooth bearing.
4 According to the bearing material, it can be divided into bronze bearing, cast iron bearing, plastic bearing, gemstone bearing, powder metallurgy bearing, self-smooth bearing and oil bearing.
5 according to the bearing tile layout can be divided into round bearings, elliptical bearings, three oil leaf bearings, step surface bearings, tilting pad bearings and foil bearings.
Information 1) Metal materials; such as bearing alloys, bronze, aluminum-based alloys, zinc-based alloys, etc.
2) Porous metal data (powder metallurgical data),
3) Non-metallic materials.
In the meantime:
Bearing alloy: bearing alloy is also called white alloy; the first is alloy of tin, lead, antimony or other metals; because of its good wear resistance, high plasticity, good running function, good thermal conductivity and good resistance to glue and oil The adsorption is good; therefore, it is suitable for heavy load and high speed; the strength of the bearing alloy is better than that of the 鄹窠瞎螅 褂 褂 匦虢 匦虢 匦虢 . . . . . . . . . . . . . . . . 耐 耐 耐 耐.
Porous metal data: Porous metal is a powder material; it has a porous arrangement; if it is immersed in a smooth oil; it fills the pores with smooth oil; becomes an oil-bearing bearing; has a self-smoothing function. Porous metal The patience of the information. Huang Shi 谄 谄 谄 鹊 鹊 蕹寤髟 蕹寤髟 蕹寤髟 爸 爸 爸 爸 爸 爸 爸 爸 爸 爸 爸 爸
Bearing plastic: commonly used bearing plastics are phenolic plastic, nylon, PTFE, etc.; plastic bearings have greater compressive strength and wear resistance; can be smooth with oil and water; also have self-smooth function; but poor thermal conductivity.
The faulty sliding bearing will conflict with the touch of the journal and the bearing bush during operation; it will cause external heat and wear and even “bite”; therefore, when drawing the bearing, the bearing bearing material with good friction reducing property should be used to make the bearing bush; Smoothing agent and choose the appropriate supply method; improve the layout of the bearing to achieve thick film smoothing.
1. Corrugated surface corrosion: Spectral analysis found that the concentration of non-ferrous metal elements is abnormal. The sub-micron-scale wear particles of many non-ferrous metal components are present in the iron spectrum, and the smooth oil moisture overruns and acid value overruns.
2, the outer surface corrosion of the journal: spectral analysis found that the concentration of iron is abnormal; there are many sub-micron particles of iron in the iron spectrum; smooth oil moisture overrun or acid value overrun.
3, the external appearance of the journal: there are iron-based cutting abrasive black oxide particles in the iron spectrum; metal appearance has tempering color.
4, fretting wear on the tile back: spectral analysis found that the iron concentration is abnormal; there are many iron sub-micron wear particles in the iron spectrum; smooth oil moisture and acid value is abnormal.
5, bearing external strain: found in the iron spectrum cutting abrasive; abrasive particles are non-ferrous metals.
6. Wafer surface shedding: There are many large-scale fatigue-shedding alloy wear particles and layered abrasive grains found in the iron spectrum.
7. Bearing burnt tile: There are many large-scale alloy abrasive grains and black metal oxides in the iron spectrum.
The primary device part of the characteristic sliding bearing is the bearing bush; most of the large-scale turning equipment of the power plant is used for sliding bearings; usually, the bearing bush is made of babbitt; therefore, the softening point and melting point of the bearing bush are relatively low. The touch area with the shaft is also very large; it can carry relatively heavy loads, the shock absorption function is also very good, and it can accept a large impact load; if the smooth oil is stored in the lower part of the bearing bush, it needs to have a bad oily movement. To ensure the composition of the tile oil film. Usually the temperature of the regular rolling bearing can not exceed 80 ° C; and the sliding bearing is lower; the temperature can not exceed 70 ° C.
Delineation of the matter of concern Sliding bearings are touched by the surface; therefore, the oil film must be adhered to between the touch surfaces; therefore, the following issues should be emphasized when drawing:
1. Let the oil film smoothly enter the conflict appearance.
2. The oil should enter the bearing from the non-bearing surface area.
3. Do not open the full ring oil groove in the middle of the bearing.
4, such as oil tiles; seams open oil grooves.
5, to make the oil ring to the oil is strong and reliable.
6, the fuel hole should not be blocked.
7, do not constitute an oil inactive area.
8. Avoid sharp edges and sharp edges that block the oil film.
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