Double Row Bearing Deep Groove Ball Bearing

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4312 ZZ double row bearing deep groove ball bearing

Deep groove ball bearings are particularly versatile. They are simple in design, non-separable, suitable for high and very high speeds and are robust in operation, requiring little maintenance. Because deep groove ball bearings are the most widely used bearing type, they are available from TIANHE in many designs, variants and sizes.

In addition to the bearings presented in this section, deep groove ball bearings for special applications are shown under Engineered products.



1.PTFE with fibre 0.01~0.03mm 

2.Porous bronze 0.2~0.3mm 

3.Steel backing 0.7~2.3mm 

4.Tin-plating 0.005mm or copper plating 0.008mm 



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:What is the relationship between plain bearings, bearings and axle diameters?
The bush or the bearing are all objects, and the axle diameter is a concept of distance
Q:What is the selection principle of grease for plain bearings?
1. Working environment analysis of sliding bearings in use(1) bearing load, high speed, should choose cone penetration of grease, and vice versa, we should choose cone penetration. If the high-speed bearings, cone penetration is small, good mechanical stability of grease. Special attention is paid to the lower viscosity of the base oil of the grease(2) the drip point of grease should be used at 20-30 degrees higher than the working temperature. In the case of continuous running at high temperature, special attention should be paid not to exceed the allowable temperature range of grease(3) if the sliding bearing works in water or wet environment, choose the calcium base, aluminum base or lithium base grease with good water resistance(4) the grease with better adhesion is chosen
Q:Effect of bearing speed on oil film stiffness of journal bearings
The general conclusion is that the higher the rotational speed, the greater the stiffness, the higher the oil pressure and the greater the stiffness. But not the greater the speed and oil pressure, because it will bring power consumption, temperature rise and stability of a series of problems
Q:What are the technical requirements and precautions for the assembly of plain bearings?
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.
Q:How are the bearings heated and smoked handled 5
The most urgent treatment:1. emergency shutdown. The sliding bearing heating smoke indicates that the clearance between the sliding bearing and the shaft is too tight, or that the grease / grease has impurities (metal scraps) and other things, and that it may be that the bearings have reached the service life and damaged. Maintenance may cause damage to the shaft if it is not shut down, so maintenance costs will be higher.2. disassemble and repair the pump. Check what causes heat, smoke, cooling is a temporary solution, not only the pump will also heat, and may damage the whole pump. For example, check the running of the bearings, whether there is a deep scratch, or whether the shaft is worn, whether there is a foreign body. After confirming the cause, proceed "the right remedy"".3. treatment methods:3.1. the lightest disease is the use of bearings for too long, the internal grinding and shaft clearance is too large, so that the shaft in high speed operation can not be concentric, the friction coefficient is too large, produce a lot of heat smoke, this method change bearings.3.2. if the bearing is damaged, the scratch is very deep, the shaft is not damaged, replace the bearing. In the important or high cost equipment, but there is disassembly repair, bearing clearance is obviously large, the situation is generally directly replace bearings.3.3. clearance of the bearing and the shaft with impurities, so that the clearance of the bearing and shaft is too small to generate heat in the smoke, dismantling maintenance if bearing serious damage to replace the bearings, bearing no damage but local small scratches, water sandpaper polished repair carefully, but it needs some skills "".
Q:What are the four types of commonly used sliding bearing alloys?
Babbitt, copper alloy, cast iron, rubber, nylon are also useful in wood.
Q:On what occasions are plain bearings used?
1, the working speed is very high;2, requirements of the axis support particularly accurate occasions;
Q:What are the factors associated with the oil film pressure of dynamic sliding bearings?
2) the two surface separated by the oil film must have sufficient relative sliding velocity, and its direction of motion must flow from the big mouth to the lubricating oil and out of the small hole
Q:What are rolling bearings, sliding bearings, the difference between them obviously,
Of course, there is a difference between rolling bearings are rolling bodies and raceways in contact with point or line contacts, while plain bearings are surface contacts.
Q:Sliding bearings are mainly tin,
Refers to the ability to work with the spindle neck to adapt to the working environment, especially after the new model or operation has just started. After the running in period, the plain bearing and the shaft neck do not change together.

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