What Are Our Concerns About Bearings（13）

Q1:Tapered roller bearing internal and external installation tolerance, the requirement is that the inner ring and the shaft rotate together, the outer ring is fixed on the fuselage, there is axial force and lateral force  

Metric series single row tapered roller bearings:  

Operating conditions are inner ring rotation  

Ordinary load — k6, M6 with tolerance, k5, M5 instead;  (It is better to provide the size for what kind of machinery)  

Outer ring (all sizes) : no need for inner ring not to move easily on shaft,         tolerance fit is H6  

Q2:How to calculate the interference caused by bearing installation?  

The calculation of interference requires the following two points:  

• 1. Inner diameter tolerance of bearings.  The size of bearing inner diameter tolerance zone is determined according to the nominal size of bearing inner diameter. It is necessary to check the mechanical design manual or national standards;  

• 2. The actual size of the journal;  

The interference is obtained by subtracting the size of the bearing inner diameter from the size of the journal (nominal size + average tolerance).  

Q3:Ask insulating bearing, ceramic bearing, plastic bearing, which insulation performance is better?  

First of all, know the type, have to know your bearing size, this can not be known according to your information.  

Insulating ceramics, this is very rare in China, if really used up the price is very   high.  Ceramic steel bearings are relatively high compared with ordinary bearings,   but the insulation performance is very good.  It’s like the ceramic thing on the      top of the pole that wraps the wires.  Plastic is relatively cheap, but it depends on your requirements.  

Q4:6011 Bearing dimensions  

Domestic model 111  

Inside diameter: 55 mm  

Outer diameter: 90 mm  

Height: 18 mm

Q5:Where are the mounting dimensions of commonly used bearings?  

You can find these things according to the brand of bearings, foreign brands have (easy), domestic need to spend some effort.  

Take NSK for example, as long as you find a “Rolling Bearing Comprehensive Catalogue” version number: 1102F.  Basically all had, besides what you say these, connect chamfering dimension, axle shoulder, cooperate, precision, cooperate even with axle, material is qualitative, grease is chosen, all sorts of calculation formula have.  

In addition, these data are compiled according to ISO standards, that is to say, as  long as you have a factory data, most of the parameters are consistent with other mainstream factories in the world.  

In addition: login SKF official website, Schaeffler Group official website (FAG&INA) in INA, you can check these parameters you said.  More than no, other official      websites have not seen.  Japanese mismi is a direct popup PDF file, not downloadable! 

Q6:What is the type of bearing with inner diameter 10 and outer diameter 30 and thickness 9?  

According to GB/T276-1994, the bearing type belongs to 6200.  

Belongs to deep groove ball bearing.  For bearing radial load, also can be used to  bear certain axial load.  

6: deep groove ball.  2:2 series bearings.  

Bearing: inner diameter of 10㎜, outer diameter of 30㎜, width of 9㎜, weight of  0.030 kg.  

Q7:Identification of bearing inner and outer rings  

Generally speaking, bearing inner and outer rings are not marked.  In the bearing  model, the unified model of different bearings is formed.  And this model represents its outer ring diameter, inner ring diameter, bearing thickness, etc.  For example,   6200 Z1, the front indicates the bearing type, and the back indicates the bearing  (noise) level.  Of course, there are many non-standard models, according to the    comparison table to bearing specific parameters.  Because the bearing is a high     precision part, generally not directly engraved on the bearing, some will be on the bearing outer ring end face laser play, some in the dust cover engraved model,   manufacturer name English or pinyin abbreviation code.  

The selection of bearings should be based on what parts are used, and what are   the requirements of specific working conditions (such as revolution, high temperature, low temperature, how much load to bear, etc.).  

Q8:What is the meaning of 6208-ZZ bearing model?  

The exact model is 6208-2Z, which means: deep groove ball bearing, light narrow series, inner diameter 40, outer diameter 80, thickness 18, 2Z means double-sided dustproof seal cover  

Q9:What is the bearing model with an outer diameter of 32.5mm and an inner diameter of 15mm?  

Name = Angular contact ball bearing  

Standard = extracted from GB/T 292-1994 refer to ISO15-1981  

Unit = (mm)  

———————————————————–  

• Bearing code =7002CJ  

Size \ d = 15  

Size \ D = 32  

Size \ B = 9  

Size \ rs (min) = 0.3  

Size \ r1s (min) = 0.15  

Weight (kg) material = 0.028  

Name = Angular contact ball bearing  

Standard = extracted from GB/T 292-1994 refer to ISO15-1981  

Unit = (mm)  

———————————————————–  

• Bearing code =7002ACJ  

Size \ d = 15  

Size \ D = 32  

Size \ B = 9  

Size \ rs (min) = 0.3  

Size \ r1s (min) = 0.15  

Weight (kg) material = 0.028  

Q10:What is the inner diameter of bearing table 30211?  

Tapered roller bearing  

The last two times 5 is the inner diameter of the bearing  

30211 should have an inside diameter of 55  

Bearings can choose to use Taiwan ZNQ  

Quality can replace imported products with high cost performance