Heating installation of self-aligning roller bearings

release time：2022/7/11 17:11:08

For bearings with large installation interference or large size bearings, in order to facilitate installation, the principle of thermal expansion and cold contraction can be used to heat the bearings in the tank and install them with copper rods, sleeves and hand hammers. Heating temperature is generally controlled below 100℃, 80-90℃ is more appropriate. When the temperature is too high, it is easy to cause annealing of raceway and rolling body of bearing ring, affecting hardness and wear resistance, resulting in reduced bearing life and premature scrap.

The matching of self-aligning roller bearing and shaft is generally transition fit, and the matching of seat ring and bearing seat hole is generally clearance fit. The center ring of the two-way bearing should be fixed on the shaft to prevent rotation with respect to the shaft. The installation method of bearings is generally the case of shaft rotation, so the inner ring and shaft fit for win, bearing outer ring and bearing chamber fit for clearance.

When installing the self-aligning roller bearing, first 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, and observe the dial meter pointer while rotating. If the pointer swings, it indicates that the shaft ring and the center line of the shaft are not vertical. If the shell hole is deep, you can also use the lengthened micrometer head inspection. This is a good way to check the verticality of the ring and center line of the shaft.

The self-aligning roller bearing is installed backwards, not only the bearing does not work normally, but also each mating surface will suffer serious wear. Because the difference between the shaft ring and the seat ring is not very obvious, extra care should be taken in the assembly, and there can be no reverse installation. When installed correctly, the seat ring should automatically adapt to the rolling of the rolling body, ensuring that the rolling body is located in the upper and lower ring raceway. In addition, there should be a gap of 0.2-0.5mm between the bearing seat and the bearing seat hole to compensate for errors caused by inaccurate processing and installation of parts. When the center of the bearing ring is offset in operation, this gap can ensure its automatic adjustment to avoid contact friction and make it run normally. Otherwise, severe bearing damage will be caused.