advanced search self-aligning ball bearing 2208

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advanced search self-aligning ball bearing 2208
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Advanced search self-aligning ball bearing 2208

Double row self-aligning ball bearings have a sphere raceway in the outer ring and a double raceway in the inner ring. This feature give the bearings their self-aligning property, permitting angular misalignment of the shaft relative to the housing. They are therefore particularly suitable for applications where misalignment can arise from errors in mounting or from shaft deflection.

Double row self-aligning ball bearings are mainly used to carry radial loads and light axial loads, but cann't carry pure axial loads  



Load capacity                 140N/mm2 

Temperature                  -195°C ~ +280°C 

Speed limit                     5m/s 

Friction coef(u)               0.04~0.20 

PV Limit(Dry)                  3.6N/mm2 .m/s 



1.PTFE and fibre can protect the shaft while in operation. 

2.It is suitable for the machine required harmless to people because 

of Lead-free. 

3.Goodload capacity and anti-wear. 

4.Bronze and steel have good thermal conductivity. 

5.Anti-corrosion because of surface plating. 

6.It is widely used in general machines,and suitable for food machine,pharmaceutical 

machine,tobacco machine etc.It will subsitute SF-1 series bushings in future because of environment protection. 



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Q:Effect of bearing speed on oil film stiffness of journal bearings
Of course, the faster the turn, the greater the impact!
Q:Now the self-lubricating sliding bearings can withstand the high speed, and if the speed is 30000 rpm, what kind of sliding bearings are chosen?
30000 rpm, very high speed, it is recommended to have angular contact, such as 7206. I wonder if you used that model. Can you say the next model?
Q:Is the ultra high speed spindle suitable for sliding bearings?
(1) types and characteristics of plain bearings1. the sliding bearings are divided according to the load:(1) radial sliding bearing (radial sliding bearing), mainly bearing radial load;(2) thrust bearings are mainly subjected to axial load2. sliding bearings are suitable for low speed, high precision, heavy load and structural requirements. They are also used in low speed and impact occasions3. center journal bearing(1) integral type and split fractionThe splitting is usually made up of bearing cap, bearing seat, bearing bush and connecting bolt(2) the Bush is the key part in the bearingBearing materials should have small coefficient of friction, good thermal conductivity, small coefficient of thermal expansion, wear resistance, corrosion resistance, anti scuffing ability, sufficient mechanical strength and plasticity(3) requirements for bearing materials: bearing alloy (Babbitt), bronze, bearing materials of special properties, etc.
Q:In power plants, are the bearings used in turbines rolling or plain bearings?
Because of the high speed of the turbine, it is usually a sliding bearing. Rolling bearings are used only for low speed generators.
Q:The greater the fuel consumption of a sliding bearing, the greater or smaller the heat?
The greater the heat, the more volatile the oil!
Q:How is the sliding bearing (bushing) axially fixed? Ten
It's OK to use the interference fit.
Q:What are the differences between rolling bearings and plain bearings?
Two, compared with the sliding bearing, deep groove ball bearings shortcomings:1, vibration and noise;2. Radial dimensions larger than plain bearings;3 、 poor ability to withstand impact loading;4 、 under high speed and heavy load, the bearing life is low.
Q:On what occasions are plain bearings used?
6, small size occasions must be used;7 、 bearings under special working conditions.
Q:What is the clearance of plain bearings?
To leave a certain axial clearance, which refers to the axis of the movement of the gap, but also divided into thrust gap and expansion gap. The thrust clearance is the clearance left for the thrust bearing to allow for axial movement. The expansion clearance is the clearance left to the bearing in accordance with the radial load in order to ensure the free expansion of the shaft. The size of the gap is related to the accuracy of the machine in operation, the smaller the radial clearance, the higher the accuracy, but the gap narrowed to a certain extent, it can not guarantee liquid lubrication. When the clearance is too large, it will generate pulsation in the rotation, and can not form a stable oil film lubrication. Therefore, the radial gap value can not be arbitrarily specified, should comply with the requirements of the machine technical documents. The radial clearance of plain bearings is very important, too large and too small to be extremely harmful. The gap is too large, the lubricating oil film bearing is formed, can not guarantee the liquid lubrication, and can reduce the operation of the machine precision, even violent vibration and noise, would cause serious accidents; the gap is too small, it is also difficult to form a lubricating oil film, will have a high fever, serious accident will occur. The sliding bearing should be provided with an axial clearance to allow the axle to flex freely when the temperature changes. Generally speaking, in order to improve the running accuracy of the shaft, the axial clearance is smaller. But not too small, axial clearance is too small, high heat occurs in the operation may produce bite phenomenon, or even damage bearings, accidents.
Q:What are the requirements for the material performance of plain bearings?
When the machine does not work, the axle is resting on the bearing and exerts pressure on the bearing. When the shaft rotates at a high speed, the shaft to the bearing with periodically varying load, sometimes accompanied by shock. The basic function of plain bearings is to accurately locate the shaft and to support the shaft without damaging it under load. Shafts usually cost higher and are often uneconomical to replace. Selecting the bearing alloy that meets certain performance requirements can guarantee the minimum wear of the shaft.

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