Rolling bearing assembly - 2020
06 -
16 Wang Zhanguang (
Jiaozuo strong cement)
Rolling bearing because of its small resistance, the advantages of flexible rotation, convenient installation and easy standardization is widely used in equipment support of rotary parts, simple today talk about rolling bearing assembly method and the matters needing attention.
A, the choice of rolling bearings with inner sleeve of rolling bearing with the shaft with the use of base hole is made, the coat of the self-contained bearing adopts the basic shaft system.
Rolling bearing with the choice depending on the type of bearing, precision grade, size, load and assembly form choice for conditions, but mainly depends on the load size, the load carried by the direction and the nature of the load.
On the accuracy of bearing, the cement industry is given priority to with E, G levels.
Rolling bearing assembly to consider two cases, the matching of the inner sleeve and axle neck, coat and bearing seat, under normal circumstances, if the axis of rotation, together with the bearing inner sleeve bearing and shaft neck USES the interference fit, coat of the bearing and bearing the clearance fit;
If coat of the bearing and the bearing body is rotated, the bearing body and bearing jacket USES the interference fit, the bearing inner sleeve and bearing inner sleeve by clearance fit.
Interference quantity and size can be according to the size of the bearing clearance, load characteristics, load direction, load size, and so on and so forth manual provided by mechanical selection, the size of the over surplus quantity of the can also adopt the method of calculation.
Second, the calculation method of the over surplus quantity of the assembly with the rolling bearing is determined according to the requirements of drawings, and also can undertake choosing according to the manual, so that may inconvenience at the scene of the installation, you can according to the load conditions, undertake choosing according to calculation method, calculation method is as follows: type: a unit for surplus quantity mmQ for Nb radial load bearing contact length MMK coefficient.
Light bearing choose 2.
78, intermediate choose 2.
27, grade 1.
96.
Using type on calculation, load size according to the rotor of the weight of 1.
5 to 3.
0 times, take small value of the small vibration, vibration of great value.
Also consider interference fit of rolling bearing to allow clearance variables.
Gap variable refers to the size of the bearing clearance changes before and after the assembly, and can be used in a feeler, if a large amount of interference, narrow clearance, if beyond the scope of allowed, bearing body can produce friction, and the bearing inner and outer bearing caused by fever, even jammed.
So the recommended selection according to the size of the bearing inner diameter.
Three, bearing assembly method of rolling bearing assembly is refers to the bearing inner sleeve and axle neck, the coat of the bearing and the bearing body assembly.
Before the assembly should be measured and journal bearing inner diameter and bearing body of the aperture size, in order to determine the assembly method.
1, the amount of the assembly when the interference interference fit is less than 0.
3 mm, pressure can be used into the method of assembly.
Inner sleeve and shaft assembly, the pressure within the set;
Coat in the bearing body assembly, should press top coat;
Strive to avoid contained within the set pressure coat or jacket, or axial force on the bearing damage.
Like this small amount of interference, if the site no press, can use a socket with hammer for assembly.
When the interference amount greater than zero.
3 mm, the assembly of bearing inner sleeve and the shaft neck can adopt heating installation.
Heating method using oil bath heating, electromagnetic heating, heating temperature to control within 120 ℃.
Some site using acetylene flame heating, heating is not uniform, 2 it is not easy to control temperature, easy to support bearing damage, is not recommended.
For of type bearing seat, bearing the coat and the installation of the bearing, coat and bearing contact Angle should not be less than 120 degrees, and requirements on either side of the bearing body outlet should be 0.
1 to 0.
The clearance between the 3 m (
Is it coat of the bearing and bearing inner hole does not contact)
In order to prevent clip to help.
Bearing body up and down of inner hole size must be qualified, if a little squashed bearings.
Bearing assembly clearance check and adjustment is an important work.
Bearing clearance inspection can use feeler, feeler, under limited pressure lead method is also available.
Bearing generally used in pairs on the shaft, shaft must be considered in temperature in the work, should be left within a bearing axial elongation.
Elongation can press type calculation.
Type: A elongation mmB bearing spacing mmT ℃ temperature bearing installation considerations for many, far more than these, only hope can have the effect of the topic, the wrong place, please comment!
