What Are Our Concerns About Bearings（33）

Q1: What type of bearing does HM2-280S-4 three-phase asynchronous motor 75KW use?  

A:HM2-280S-4 three-phase asynchronous motor 75KW for model 6317 deep groove ball bearings.  

Deep groove ball bearing is a common type of rolling bearing.  The basic deep groove ball bearing consists of an outer ring, an inner ring, a set of steel balls and a set of retainers.  Deep groove ball bearing type has single row and double row two kinds, deep groove ball structure is divided into sealed and open two kinds of structure, open refers to the bearing does not have a sealed structure, sealed deep groove ball is divided into dustproof seal and oil-proof seal.  

Deep groove ball bearings mainly bear radial load, but also bear radial load and axial load at the same time.  When it only bears radial load, the contact Angle is zero.  When deep groove ball bearings have large radial clearance, they have the performance of angular contact bearings and can withstand large axial loads. The friction coefficient of deep groove ball bearings is very small, and the ultimate speed is also very high.  

Q2: What does bearing 6207 C3 mean?

A:6207 C3: Deep groove ball bearing  

6: Structure type code.  Indicates that the bearing is a deep groove ball bearing.  

2: Outer diameter series code.  Indicates that the bearing outer diameter is “2” series (medium) diameter.  

07: Id code.  Represents the inner diameter size of the bearing =07×5=35mm.  

C3: Radial internal clearance code (commonly known as the clearance of bearings).  C3 clearance indicates that the radial internal clearance of this bearing is slightly larger than the standard clearance.Clearance size arrangement:  

C2 clearance (small clearance) less than C0 clearance (standard clearance) less than C3 clearance (large clearance) less than C4 clearance less than C5 clearance.  

In the bearing code, C0 clearance is generally omitted.  

Q3: How to calculate the axial load of deep groove ball bearing?  How large a bearing can withstand 200Kg of axial force? 

A:The theory of deep groove ball bearing is not affected by axial force, but it will be affected by slight axial force in the practical application process, because it has a certain aligning effect, and will return to its original position after the axial force disappears  

The size of the axial force should be related to the actual working environment. The force of the ball bearing after the axial force is equivalent to the contact Angle, which is similar to the angular contact ball bearing. The axial force also has a great relationship with the clearance of the bearing itself and the radius of the ditch rate.  

In particular, the greater the clearance, the greater the scope of the ball in the axial position, that is, the greater the axial clearance, the greater the axial force can withstand, but the clearance can not be blindly large.  

Anyway, I can tell you that the axial force is much less than the radial force, and how do you calculate it, because the contact Angle is unpredictable, so there’s no way to know  

If the bearing under radial load at the same time also need to continue the axial load, the selection of deep groove ball bearing is not reasonable, for sustained axial force will reduce the life of the deep groove ball bearings, according to the speed and other industrial and mining can choose or tapered roller bearings, angular contact ball bearing if need two-way by the axial force can also choose to four-point contact ball bearing,  Double row tapered roller bearings or double row angular contact ball bearings. 

Q4: How much axial force can deep groove ball bearings bear?

A:If the deep groove ball bearing is under a simple axial load, the axial load generally should not exceed the value of 0, 5C0.  Small bearings (inner diameter of approximately 12 mm) and light series bearings (diameter series 8, 9, 0 and 1) should not bear axial loads greater than 0,25 C0.  Excessive axial load can greatly shorten the service life of bearings.  

Q5: Is there any difference between bearing 209 and bearing 6209?

A:6209 is the new code, 209 is the old code, it’s the same.  2 represents light narrow series, and 6 represents single row centripetal deep groove ball bearings  

Dimensions: outer diameter 85mm, inner diameter is 09*5=45mm, thickness is 19mm.  

Q6: What kind of bearing is bearing Model 36208?

A:This bearing is an angular contact ball bearing with the old code number and the new international code number 7208C.  Mainly bearing radial load can also bear part of the axial load.  The deformation of deep groove ball bearings is mainly used for pump motors and other parts  

Q7: Is 6907 bearing the same as 61907 bearing?  If not, what’s the difference?  

A:6907 is an angular contact ball bearing with an inner diameter of 35, an outer diameter of 55 and a width of 10.  

61907 is deep groove ball bearing, parameters are the same as above,

 The categories are different.  

Q8: What is the difference between bearing 6308 and N308?

A:Deep groove ball bearing  

N308: Short cylindrical roller bearing.  Outer ring without flange, inner ring double rim.  

(1) Different load bearing.  

Radial bearing, the same size cylindrical roller bearing is much larger than deep groove ball bearing.  

Axial load bearing, deep groove ball bearing can bear certain axial load, N308 can not bear axial load.  

(2) Different speed.  

Deep groove ball bearing rolling body and raceway surface contact surface is relatively small, relative to cylindrical roller bearing, speed is  

A big improvement.  

(3) Others  

The N308 is generally used at the free end of the shaft, allowing relative axial displacement.  And 6308 deep groove ball bearings can not.  Cylindrical roller bearings can greatly improve rigidity and can apply preload.  Deep groove ball bearings are lacking.  

In fact, the two bearings have almost nothing in common except the same size.  It is absolutely impossible to generalize under most circumstances.  

Q9: What bearing is 6308-2RS?

A:6308-2RS is deep groove ball bearing,  

Specifications are INSIDE diameter: 40 outside diameter 90 height 23.  

Belongs to medium wide series.