Matching method of thrust bearing and shaft

- Feb 07, 2021-

The fit between thrust bearing and shaft is generally a transition fit, and the fit between the seat ring and the bearing housing hole is generally a clearance fit (seeing this, you must agree with me). The middle shaft ring of the two-way thrust bearing should be fixed on the shaft to prevent rotation relative to the shaft. The installation method of thrust bearing is generally the case of shaft rotation. Therefore, the fit between the inner ring and the shaft is an over-win fit, and the fit between the outer ring of the bearing and the bearing chamber is a clearance fit.

When installing the thrust bearing, check the verticality of the shaft ring and the shaft center line. The method is to fix the dial indicator on the end face of the case, make the contact of the indicator rest on the raceway of the bearing shaft ring while rotating the bearing, while observing the indicator of the dial indicator, if the indicator yaws, the shaft ring and the shaft center line are not perpendicular. When the box shell hole is deep, it can also be inspected with an extended dial gauge. When the thrust bearing is installed correctly, its seat ring can automatically adapt to the rolling of the rolling elements to ensure that the rolling elements are located in the upper and lower raceways. If it is installed backwards, not only the bearing will not work properly, but also the mating surfaces will be severely worn. Since the difference between the shaft ring and the seat ring is not very obvious, you should be extra careful during assembly and make no mistake. In addition, a gap of 0.2-0.5mm should be left between the seat ring of the thrust bearing and the bearing seat hole to compensate for the errors caused by inaccurate parts processing and installation. When the center of the bearing ring shifts during operation, this gap It can be ensured that it is automatically adjusted to avoid contact and friction and make it run normally. Otherwise, it will cause severe damage to the bearing.

When installing the thrust bearing, check the verticality of the shaft ring and the shaft center line. The method is to fix the dial indicator on the end face of the case, make the contact of the indicator rest on the raceway of the bearing shaft ring while rotating the bearing, while observing the indicator of the dial indicator, if the indicator yaws, the shaft ring and the shaft center line are not perpendicular. When the box shell hole is deep, you can also use the extended dial gauge to check

When the thrust bearing is installed correctly, its seat ring can automatically adapt to the rolling of the rolling elements to ensure that the rolling elements are located in the upper and lower raceways. If it is installed backwards, not only the bearing will not work properly, but also the mating surfaces will be severely worn. Since the difference between the shaft ring and the seat ring is not obvious, you should be extra careful during assembly and make no mistake. In addition, a gap of 0.2-0.5mm should be left between the seat ring of the thrust bearing and the bearing seat hole to compensate for the errors caused by inaccurate parts processing and installation. When the center of the bearing ring shifts during operation, this gap It can be ensured that it is automatically adjusted to avoid contact and friction and make it run normally. Otherwise, it will cause severe damage to the bearing.

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