Generally speaking, rolling bearings with tight fit interference mounting must be close to the shaft shoulder.  So how do you test that?  The following is to share the detection method of rolling bearing and shaft shoulder tightness, hoping to help you with the bearing installation.

(1) Lighting method.  This method is to align the lamp bearing and shaft shoulder, according to the light leakage situation.  If there is no light leakage, the installation is correct;  If light leakage is uniform around the shaft shoulder, the rolling bearing is not close to the shaft shoulder, and the rolling bearing should be pressed to make it close;  If there is some light leakage, it means that the bearing is installed tilted, and the inner ring of the bearing can be hit with a hammer, copper rod or sleeve to gradually stabilize.

(2) thickness test method.  The thickness of the gauge should start at 0.03mm.  During the inspection, several places are tried on the end face of the bearing inner ring and the whole circumference of the shoulder. If there is a gap and it is very uniform, the bearing is not installed in place. The bearing inner ring should be pressurized to make it close to the shoulder.  If the pressure is not tight, it means that the roundness of the shaft neck is too large and the bearing is stuck. The shaft neck roundness should be trimmed to make it smaller;  If it is found that the end face of the bearing inner ring and the thickness gauge of individual parts of the bearing shoulder can pass, it must be removed, repaired and re-installed.

If the bearing is installed in the bearing seat hole with interference fit, and the bearing outer ring is fixed by the shoulder of the shell hole, whether the end face of the outer ring is close to the end face of the shoulder of the shell hole, and whether the installation is correct can also be checked by the thickness gauge.

Such as: thrust bearing inspection after installation

When installing thrust bearings, the verticality of shaft ring and shaft center line should be checked.  The method is to fix the dial meter on the end face of the case, so that the contact head of the table rotates the bearing above the raceway of the bearing shaft ring, while observing the dial meter pointer, if the pointer swings, it indicates that the shaft ring and the shaft center line are not vertical.  When the shell hole is deep, you can also use the extended micrometer head for inspection.

When the thrust bearing is installed correctly, the seat ring can automatically adapt to the rolling of the rolling body to ensure that the rolling body is located in the raceway of the upper and lower ring.  If it is installed backwards, not only does the bearing work abnormally, but also the mating surface will suffer serious wear and tear.  Because the difference between the shaft ring and the seat ring is not very obvious, the assembly should be extra careful, do not make mistakes.  In addition, there should be 0 between the seat ring and the bearing seat hole of the thrust bearing.  2-0.  5mm clearance is used to compensate for errors caused by inaccurate machining and installation of parts. When the center of the bearing ring is offset in operation, this clearance can ensure its automatic adjustment to avoid contact friction and make it run normally.  Otherwise, severe bearing damage will be caused.

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e-mail:bearing6@hyzcgroup