What Are Our Concerns About Bearings（40）

Q1: ZWZ bearing 7228BM/DB, what is the meaning of the suffix letter M?

A:7228: Code for angular contact ball bearing.  

B: It’s the contact Angle: 40 degrees.  

M: The cage is made of copper.  

DB: Bearing installation mode, is back-to-back installation.  

Q2: What is the meaning of GTBRITAIN EXPLORER behind SKF 22314E bearing?  

A:Gt.Britain means: the origin of bearings, that is, the British factory.  Common countries of origin also include Australia, French, Germany and India, Malaysia, Qingdao, Shanghai, etc.  

EXPLORER meaning is: SKF EXPLORER series bearings, SKF is now the main product.  

Q3: What does 22330 bearing represent?

A:There are five numbers in the model, from right to left, and the third number 3 represents the diameter series of bearings.  The fourth number, 2, indicates the width series of bearings (provided that both sets of bearings have the same inner and outer diameters).  

Example: the diameter of 22230 is 270mm, the diameter of 22330 is 320mm, and the inner diameter is 150mm  

The same inner diameter series from large to small is: 4/3/2/0/9/8  

Example: 22230 width is 73mm, 23230 width is 96mm, inside and outside diameter are the same .

Q4: 22210CA bearing code, what CA stands for ?

A:22210CA is a self-aligning roller bearing  

Ca means the retainer is copper  

Q5: What is the difference between N7317EM and 7317ACM bearings? What does it stand for?

A:NJ type bearing has a rim on both sides of the outer ring and a rim on one side of the inner ring.  Axial orientation can be made in one direction.  NU bearing has a rim on both sides of the outer ring and no rim on the inner ring.  Allow axial displacement in both directions between the shaft and the housing.  7317ACM is angular contact ball bearing. AC means 25 degrees contact Angle and M means copper alloy car cage.

Q6: What is the application scope of self-aligning roller bearings? Where is the manufacturer?

A:Paper making machinery, reducer, railway vehicle axle, rolling mill gearbox bearing seat, rolling mill roller, crusher, vibrating screen, printing machinery, woodworking machinery, all kinds of industrial reducer, vertical self-aligning bearing with seat  

The self-aligning roller bearing has two rows of rollers, mainly bearing radial load, but also bearing axial load in any direction.  High radial load capacity, especially suitable for heavy load or vibration load, but can not bear pure axial load.  The raceway of the outer ring of this kind of bearing is spherical, so it has good aligning performance and can compensate coaxiality error.  

Self-aligning roller bearings are widely used, and there are hundreds of domestic manufacturers.

Q7: There is a cylindrical roller bearing with an inner diameter of 50 mm, an outer diameter of 80 mm and a thickness of 20 mm. What type of bearing is it?  

A:Tapered roller bearing, new model 32010, old model 2007110E.

Q8: How many kinds of bearings are there?

A:Bearings can be divided into sliding bearings and rolling bearings according to the friction mode, and rolling bearings are divided into ball bearings and roller bearings according to the shape of the rolling body.  

Ball bearings can be divided into:  

Double row angular contact ball bearings  

Automatic aligning ball bearing  

Double row deep groove ball bearings  

Thrust ball bearing  

Single row deep groove ball bearings  

Single row angular contact ball bearings  

QJ four point contact ball bearing  

Roller bearings can be divided into:  

2 spherical roller bearing (also called self-aligning roller bearing in China)  

Tapered roller bearing  

Thrust roller bearing  

Cylindrical roller bearing  

Q9: Taper roller bearing 32009, 32010 requires how many rollers, can reduce one to two, what is the impact on the bearing?  

A:When designing bearings, in order to ensure a certain bearing capacity, the number of rolling bodies and the diameter of rolling bodies will be selected.  But their two constraints sometimes contradict each other, so there will be an optimal combination in the design, choose a good one.  

If the number of rolling bodies must be reduced, the diameter of the rolling bodies must be increased to ensure the normal use of bearings, but the actual working conditions also need to be looked at.  

Q10: Cylindrical roller bearings with large and small contact angles, such as 32312 and 32312B, are all dimensions exactly the same?

A：Right, it’s exactly the same, the contact Angle is different just the design of the inside of the bearing,  

The dimensions are exactly the same as long as the size stays the same  

The greater the contact Angle, the greater the axial bearing capacity, the smaller the ultimate speed can withstand