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12 February 2011
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ReplyDeleteFAG 30306A bearing
ReplyDeleteAssembly of cylindrical bore bearings
First, the assembly sequence of non-separable bearings (such as deep groove ball bearings, self-aligning ball bearings, self-aligning roller bearings, angular contact bearings, etc.) should be determined by the tightness of the seat ring fit.
When the inner ring is tighter with the journal, and the outer ring is looser with the shell, the bearing is installed on the shaft first, and then the coaxial is loaded into the shell together.
When the bearing outer ring is tightly fitted with the shell hole, and the inner ring is loosely fitted with the shaft journal, the bearing should be pressed into the shell first;
When the inner ring and the shaft, the outer ring and the shell hole are tightly matched, the bearing should be pressed on the shaft and the shell hole at the same time.
Second, because of the separation of bearings (such as tapered roller bearings, cylindrical roller bearings, needle roller bearings, etc.) the inner and outer rings can be free from the assembly, the inner ring and the rolling body are installed on the shaft together, the outer ring is installed in the shell, and then adjust the clearance between them.
The common assembly methods of bearings are hammering method and compression method.
Figure 1-A is a special sleeve pressure, Figure 1-B is a symmetrical copper bar in the bearing inner ring (or outer ring) face uniform knock.
FIG. 2 is the method of pressing the inner and outer ring of the bearing into the hole of the journal and the bearing seat respectively by the presser method.
If the journal size is large and the interference is large, the hot loading method can be used for convenient assembly. That is, the bearing is heated in oil with a temperature of 80~ 100~C, and then matched with the shaft at room temperature.
When the bearing is heated, it should be put on the mesh in the oil groove (Figure 3) to avoid the bearing contacting the bottom of the box which is much higher than the oil temperature, and to prevent the contact with the precipitate dirt at the bottom of the box.
For small bearings, they can be hung on hooks and immersed in oil to heat.
Bearings filled with grease inside with dustproof cover or sealing ring should not be assembled by hot loading method.