What Are Our Concerns About Bearings（41）

Q1:What are the characteristics of tapered roller bearings and cylindrical roller bearings?

A:Tapered roller bearings are centripetal thrust structures, which can bear axial and radial forces at the same time.  Among them, a single row can only bear the axial force in one direction, and some types can bear the axial force at the same time, similar to angular contact ball bearings. The difference is that the relative speed is low, the accuracy is low, but the bearing capacity is much larger.  

Cylindrical roller bearing and deep groove ball bearings are similar, but more tolerance, roller and shaft for the line contact, the ball as point contact, the general model for bear radial force, axial force, or force is small (NJ series, for example), in the radial stress on the machine with a cylinder, and if the stress is not so big proposal with the same size ball bearing, spindle series is not one of them, though.  

• Cylindrical roller D=130MM  
• N226 130*230*40 N326 130*280*58  
• N2226 130*220*62 N2326 130*280*93  
• Tapered roller D=130mm  
• 32026 130*200*45 30226 130*230*44 32226 130*230*68  
• 30326 130 * 280 * 32326 130 * 280 * 99.5 63.75  

Q2:What is the inner diameter of tapered roller bearing 30516?

A:Check criteria. Every number has a code meaning.  The last two are supposed to represent the inside diameter, 16*5=80mm  

Q3:What series of bearings is 80511?

A:80511 is a thrust cylindrical roller bearing  

• Thrust roller bearings are used to bear combined axial and radial loads mainly in axial direction, but the radial load shall not exceed 55% of the axial load.  Compared with other thrust roller bearings, this kind of bearing has lower friction coefficient, higher speed and self-aligning performance.  
• The rod of type 29000 bearing is asymmetric spherical roller, which can reduce the relative sliding of roller and raceway at work. Moreover, the roller is long and large in diameter, the number of rollers is large, and the load capacity is high. Oil lubrication is usually used, and grease lubrication can be used in some cases of low speed.  In the design selection, should be preferred;  
• 80000 type thrust cylindrical roller bearing, 90000 type thrust tapered roller bearing and AXK type thrust needle roller bearing can withstand unidirectional axial load, which is much larger than the axial load capacity of thrust ball bearing, and large rigidity, occupy small axial space.  
• Thrust cylindrical roller bearing and thrust roller bearing are suitable for the occasion of low speed, the speed of thrust tapered roller bearing is slightly higher than that of thrust cylindrical roller bearing.  
• Thrust cylindrical roller bearings are separated bearings, which can only bear unidirectional axial load and slight impact, and can limit the axial displacement of the shaft (or housing) in one direction, so they can be used for unidirectional axial positioning.  But its carrying capacity is far greater than that of thrust ball bearings.  When the roller rolls, the roller will inevitably slide on the raceway due to the different linear speeds at both ends of the roller. Therefore, the ultimate speed of this kind of bearing is lower than that of thrust ball bearing, and it is usually only suitable for low-speed operation occasions.  
• The standard design of thrust cylindrical roller bearings is made of wheeled metal solid cage, other types or materials can also be used according to user requirements.  The thrust tapered roller bearing can only bear unidirectional axial load and can limit the unidirectional axial displacement of the bearing, so it can be used for unidirectional axial positioning.  Compared with thrust cylindrical roller bearings, the bearing capacity is large, the relative sliding is small, but the limit speed is low.  
• Thrust cylindrical roller bearings are mainly used in heavy machine tools, high power Marine gear boxes, oil drilling RIGS, vertical motors and other machinery.  

Q4:How to choose the right type of bearing?

A:1, according to the size of your shaft;  

2. The magnitude and direction of the force on the axis;  

3. Bearing size that the box body can bear;  

4. The choice of durability of bearing body.  

Q5:What is the model of four row cylindrical roller bearing with inner diameter of 180mm?  What are the parameters?  

A:Inner diameter of four row cylindrical roller bearings  

180*250*156—FC3650156;  Load 900-2420 KN;  Speed of 1540-1920;  Weight 23.9 Kg  

180*260*168 – FC3652168 load 1000-2600 KN;  Speed of 1500-1800;  Weight 29.9 Kg  

180*280*180 – FC3656180 load 1200-2900 KN;  Speed of 1400-1700;  Weight 41.7 Kg

Q6:Bearing Model 24022CE4C3S11, what does model mean?

A:C: represents cage shape (stamping cage, two rows of rollers with a ring between them)  

E4: indicates that the outer ring has oil holes (24022 bearing oil groove width 10mm, oil hole diameter 6mm, there are 4 oil holes, NSK self-aligning roller bearing outer diameter below 180mm are 4 oil holes)  

C3: indicates the clearance of the bearing (C3 clearance is slightly larger than standard clearance CN)  

Standard clearance: 75μm, 120μm.  C3 clearance: 120μm small, 160μm large.  

S11: Prevent high temperature deformation of the ring design.  The limit is 200 degrees.