What Are Our Concerns About Bearings（48）

Q1:What is the use of ball bearings?

A:Is to reduce friction, middle school physics know that rolling friction is smaller than sliding friction, rolling friction is 29%~30% of sliding friction  

Q2:Which brand of deep groove ball bearing has a longer service life on TV sets? 

A:Generally, domestic deep groove ball bearings LYC deep groove ball bearings are better in domestic  

Q3:What is the role of yo-yo high precision KK bearing ball number?

A:In general, yo-yo balls use deep groove ball bearings more, because they have a relatively high rotational speed.  The load is very small.  But the various types of deep groove ball bearings are generally installed inside the number of steel balls are certain execution of the NATIONAL standard.  

According to your actual situation, for example, if 6208 bearings are generally 10 balls.  If the radial load is too large, the number of steel balls can be reduced by increasing the steel balls. The purpose is to increase the contact area between the steel balls and the inner and outer ring working surface so as to increase the load.  On the contrary, the ball and the surface of the ball contact less friction reduced the speed of the corresponding rise.  

Q4:What steel is used for 607 bearings?

A:607 Bearing old model: 17 Type: deep groove ball bearing  

Inner diameter: 7 (mm) Outer diameter: 19 (mm)  

Thickness: 6 Weight: 0.007  

Cage and material: F1 carbon steel features: high speed  

Bearing material: steel plate purpose: general purpose  

Number of rolling column: Single row raceway type: deep groove raceway  

Q5:What are the uses of thrust ball bearings?

A: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 needle 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 roller bearings are divided into thrust cylindrical roller bearings, thrust self-alting roller bearings, thrust tapered roller bearings, thrust needle roller bearings.

Thrust cylindrical roller bearings are mainly used in oil drilling RIGS, iron and steel machinery.  This kind of thrust self-aligning roller bearing is mainly used in hydraulic generator, vertical motor, ship propeller shaft, tower crane, extruder and so on.  Thrust tapered roller bearing this kind of bearing main uses: one-way: crane hook, oil drilling ring.  Two-way: roll neck of rolling mill.  Planar thrust bearing is mainly subjected to axial load in assembly and is widely used.  

Although the installation and operation of thrust bearings are relatively simple, errors often occur in actual maintenance, that is, the installation position of the tight ring and loose ring of the bearings is not correct, which results in the loss of the bearing and the journal is quickly worn out.  The tight ring is installed on the end face of the stationary part, that is, wrong assembly.  The inner ring of the tight ring is a transition fit with the shaft journal. When the shaft rotates, the tight ring is driven and friction occurs with the end face of the stationary part. When the axial force (Fx) is applied, the friction torque is greater than the resistance moment of the inner diameter fit, resulting in forced rotation of the tight ring and the shaft mating surface, which intensifies the wear of the shaft journal.  

Q6:What are the various types of bearings used for?

A:Class 1 bearing self-aligning ball bearings, the main characteristics of high speed, pressure, are generally small bearings.  For high-speed medium, minicomputer coordination. 

 3 types of self-aligning roller bearings, the main characteristics of slow speed, high pressure, are generally large bearings, used for large machinery, steel mills, mines, excavators,

7 types of thrust ball, mainly used for, high pressure, medium speed, used for large, small machines, is in addition to the zero type of a common.  

Q7:What are the uses of self-aligning roller bearings?

A:Characteristics of self-aligning roller bearing: 1, large bearing capacity;  2, mainly bear radial load, can also bear a certain axial load, but can not bear pure axial load;  3, good aligning performance, can compensate coaxiality error;  4, low limit speed.  

Its application scope:suitable for radial heavy load, medium axial load (bidirectional), medium speed, aligning performance requirements (that is, high coaxiality) very high occasions.