Shandong Xinkaite Bearing Co.,Ltd.
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Address: Xu Village Industrial Garden, Gan Town, Guan County, Shandong
Tel: +86 635 5638235
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Address: 314 Puli Mansion, Beixiaoxinzhuang West Street, Jinan City, Shandong
Tel: +86 15562637177
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The fitting method of self-aligning ball bearing
Clicks:16769 Date:12-5
The basis for choosing coordination
According to the load acting on the bearing and the rotation of the ring, the load of the bearing ring has three kinds: local load, cyclic load and swing load. Usually the cyclic load (rotating load) and the swing load are closely matched, and the local load is not suitable for tight fit except for the special requirements. When the bearing ring to bear dynamic load and heavy load is, the inner ring and the outer ring should be used by interference fit, but sometimes the outer ring can be a little looser, should be able to swim in the axial bearing shell hole; when the bearing rings under load and load swing is light, can be used to mix with a little loose tight some of the.
Load size
Depends on the amount of interference between the bearing ring and shaft or housing bore on the size of the load, the load is heavy, the larger the amount of interference fit; the load is light, using a small surplus with the amount. The general radial load is less than 0.07C when P is less than 0.07C, and P is greater than 0.07C and is equal to or less than 0. When 15C is normal load, P is more than 0. The 15C is loaded with heavy load (C is the rated dynamic load of the bearing).
working temperature
When the bearing is running, the temperature of the ring is often higher than the temperature of the adjacent parts. Therefore, the inner ring of the bearing may become loose due to thermal expansion and the outer ring may affect the axial movement of the bearing in the shell hole due to thermal expansion. Help select, the bearing device part temperature difference, swelling shrinkage should be taken into account, large temperature difference, and the inner ring of the shaft with the choice of the amount of interference should be bigger.
Rotation precision
In order to eliminate the influence of elastic deformation and vibration, clearance coordination should be avoided when the bearing has high rotation precision.
The structure and material of the bore of the bearing shell
For the form shell hole, the interference fit should not be used when the outer ring of the bearing is fitted, and the outer ring should not be rotated in the hole of the shell. For bearings mounted on thin walled shell holes, light metal shell holes or hollow shafts, tighter matching should be adopted for thick walled shell holes, cast iron shell holes or solid axes.
Easy to install and disassemble
For heavy machinery, the bearings should be loosely matched. The tight fit, can choose the separation bearing, the inner ring and the cone with compact sets or unloading sleeve bearing.
Axial displacement of bearing
In coordination, when a ring of bearing is required to move axially in operation, the outer ring of the bearing and the hole of the bearing seat shell should be loosely matched.
Selection of coordination
The combination of bearing and shaft adopts the base hole system, while the combination with the shell adopts the base shaft system. The coordination between bearing and shaft is different from that used in machine manufacturing industry. The tolerance belt of bearing diameter is mostly below the zero sum. Therefore, when the same fit is applied, the matching ratio between bearing diameter and shaft is usually close. The tolerance belt of the bearing outer diameter and the tolerance belt of the axis of the base axis are below the zero line, but the value of the bearing is not the same as the general tolerance system.
Self-aligning ball bearing heating installation method
When the inner diameter of the bearing is greater than 70mm or when the interference is large, the bearing hole is expanded by heating method, so that the installation saves energy and time and avoids damage caused by too much force.
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