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  

                                                                                             

Technical 

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 

                                                                                                                                                                                                            

Application  

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:What is the clearance ratio between the plain bearing and the shaft?
I don't think so. I do rolling bearings, I'm sorry
Q:0 what are the friction states of plain bearings? What are the main differences between them?
The sliding bearing has a friction state1. radial movement of friction, rotation
Q:How is the normal operating temperature of the sliding bearing bush determined?
Shaft vibration and shaft temperature are the two main parameters that reflect the bearing state, so it should be analyzed from the two aspects.1.1 axis vibration if the unit has the following problem: A. magnetic force line misalignment, appears to exceed the standard deviation of gap; B. motor interturn short circuit, load imbalance; C. turbine rotor unbalance or vibration; D. installation is found, the ultra poor bearing ultra poor gap, the connection is not good. All these problems will lead to higher vibration value of bearings, but the difference is that the severity is not the same.The axial vibration is affected more directly and the data is more intuitive and accurate, so it can be monitored, analyzed and judged in real time. Generally, we adopt the method of setting upper limit axial vibration value and standard axial vibration value, and within the two value range, all belong to the normal operation category. Run 1.2 axle temperature units in addition to the above problems, but also has the following problems: A. may appear tungsten bearing hanging layer defects; B. lubricating oil and lubricating the surface problems; problems of C. oil and cooling system.
Q:What's the difference between plain bearings and oilless bearings?
5, easy sealing, easy maintenance; 6, do not need useful non-ferrous metals; 7, high degree of standardization, mass production, low cost.Compared with plain bearings, the disadvantages of rolling bearings:1, the ability to withstand shock loading is poor; 2, high speed and heavy load bearing life is low; 3, vibration and noise is larger; 4, radial size than sliding bearings.
Q:Sliding bearing lubrication, under what circumstances need throttling?
The function of throttling is to adjust the pressure of the lubricant, so that the lubricant film of the bearing is provided with corresponding bearing capacity and rigidity, and can be kept constant, so that the lubrication is stable, and the lubrication performance is improved.
Q:What's the connection between the crankshaft and the sliding bearings?
The crankshaft bearing is split sliding bearing is installed in the main bearing crankshaft, connecting rod and crankshaft support operation, is to open sliding bearing is mounted on the connecting rod hole and crankshaft crank shaft (connecting rod), the connecting rod is connected with a crankshaft.
Q:What kinds of plain bearings can be divided into?
(4) according to the principle of hydrodynamic lubrication, the hydrodynamic lubrication sliding bearing is designed, which is mainly used in the continuous high speed operation.
Q:How is the oil groove of the plain bearing processed?
Copper bushing lubrication groove processing methods are as follows: the pitch should be hung two times the length of the workpiece, the minimum speed, positive and negative threads of each car, the screw thread is fully optimized. Copper sleeve is divided into many kinds, including machine copper roller, copper bearing and so on. Oil lubricated bearings, used in various large and heavy machinery, is an important component of machinery. The copper sheath is of high hardness, excellent wear resistance, difficult to produce dead phenomenon, good casting performance and cutting performance, and good corrosion resistance in atmosphere and fresh water. When the oil and oil grooves are set on the sliding bearings, it should be noted that the oil holes and oil grooves can only be opened in the non bearing areas; the axial oil grooves can not be opened along the bearing width to prevent leakage. Sliding bearings (sliding, bearing) bearings that work under sliding friction. Plain bearings work smoothly, reliably and without noise. Under the condition of liquid lubrication, the sliding surface is separated by the lubricant without direct contact, and the friction loss and surface wear can be greatly reduced. The oil film also has a certain vibration absorption capacity. But the starting friction resistance is larger. The shaft supported by the bearing is called the journal, and the part that matches the journal is called the bush. In order to improve the friction properties of the bearing surface, the antifriction material layer, which is cast on its inner surface, is called the bearing lining. Bearing and bearing lining materials are collectively referred to as journal bearing materials. The application of sliding bearings is usually under the condition of high speed and light load.
Q:What are the tolerances and finishes for plain bearings and shaft mating surfaces?
1) the bearing and the shaft are matched with the base hole system, and the shaft shaft system is used to match the bearings and the housings.Bearing size tolerance and rotary accuracy shall be calculated according to GB307 - 84 corrosion resisting pump.2) the shaft neck and the bearing box bore with the bearing are specified according to GB1031 - 83. The Ra value of the shaft neck roughness is less than 1.6 mu m, and the bore roughness Ra of the bearing case is less than 2.5 mu m.3), bearing rings and roller manufacturing with GCr15 and ZGCr15 steel, the ring and the roller hardness value should be equal to 61~65HRC; GCr15SiMn and ZGCr15SiMn steel, the hardness of this value should be 60~64HRC. The hardness check method and the uniformity of hardness of the same part shall be stipulated by JB1255.4) check the bearings, radial clearance and axial clearance should be in line with GB4604 - 84 rules.5), rolling bearing the outer ring raceway should be no peeling, severe wear, both inside and outside the ring no after crack; ball should wear, the holder no serious deformation, rotation without abnormal noise and vibration should be gradually stopped, stop gap. 6, for the C tolerance class tapered roller bearing, the roller and raceway contact with a precision pump load with Germany for shrimp, color check into good, contact traces should be continuous, contact length should be less than no bus 80 roller.
Q:The difference between rolling bearings and plain bearings in ball mill
You should ask, why does the mill's bearings change from sliding to rolling?. The moment of technological upgrading in industry is the birth of new products. As you ask, when the ball mill starts to use the bearings is like asking when the bike starts to use chain drive. The design, I have not been able to know the mill but the historical setting, must have tried many times of failure, material, loading, production process, and ultimately determine the early embryonic development since the various types of mill.

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