The plastic thrust ball bearing consists of three parts: the seat ring, the shaft ring, and the steel ball cage assembly A weighing ring that matches with the shaft and a weighing ring that matches with the housing. The force acceptance situation is divided into unidirectional thrust ball bearings and bidirectional thrust ball bearings. Unidirectional thrust ball bearings can withstand unidirectional axial loads. Bidirectional thrust ball bearings can withstand bidirectional axial loads. Bidirectional thrust ball bearings, where the ring is matched with the shaft. The installation surface of the seat ring is a spherical bearing with self-aligning performance, which can reduce the impact of installation errors. Plastic thrust ball bearings cannot withstand radial loads and have a lower limit speed. Therefore, it is only applicable to components that bear axial loads on one side and have low rotational speeds. For example, when the crane hook is in normal condition, the two raceways should have no peeling or severe wear, and the ball bearings should have no breakage or pitting; The cage should be free of deformation, not collide with the two raceway washers, and firmly gather the ball bearings together.

The fit between plastic thrust bearings and shafts is generally a transitional fit, while the fit between the seat ring and the bearing seat hole is generally a clearance fit. The central axis ring of bidirectional thrust bearings should be fixed on the shaft to prevent relative rotation. The installation method of thrust bearings is generally in the case of shaft rotation, so 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 plastic thrust bearings, the perpendicularity of the shaft ring and the shaft centerline should be checked. The method is to fix the dial gauge on the end face of the box shell, so that the contact of the gauge is pressed against the bearing shaft raceway and the bearing is rotated while observing the dial gauge pointer. If the pointer is off center, it indicates that the shaft ring and the shaft centerline are not perpendicular. When the shell hole is deep, an extended micrometer head can also be used for inspection. When the plastic thrust bearing is installed correctly, its seat ring can automatically adapt to the rolling of the rolling elements, ensuring that the rolling elements are located on the upper and lower raceway. If installed in reverse, not only will the bearings not work properly, but the mating surfaces will also be severely worn. Due to the unclear difference between the shaft ring and the seat ring, extra caution should be taken during assembly to avoid making mistakes. In addition, there should be a gap of 0.2-0.5mm between the seat ring of the thrust bearing and the bearing seat hole to compensate for errors caused by inaccurate machining and installation of parts. When the center of the bearing ring is offset during operation, this gap can ensure automatic adjustment, avoid contact friction, and enable normal operation. Otherwise, it will cause severe damage to the bearings.