Bearing points are designed with supporting measures
When the two fulcrums are designed as floating support, Bearing the position of bearing shafting components needs to be positioned by other measures. For example, for the shafting components supporting the herringbone gear, its position can be determined by the geometry of the herringbone gear. At this time, the two fulcrums need to be designed as floating support,
but the shafting components where the herringbone gear (above the figure) used to mesh with it need to be fixed at both ends, so that both shafts can be axially positioned.
Points for attention in group configuration of angular contact ball bearings
Any arrangement using face-to-face bearing installation is not recommended because the stiffness of this arrangement is relatively low. In addition, when the operating speed is relatively high, such installation will increase the bearing preload due to the temperature difference between the bearing seat, bearing and shaft. With the increase of this temperature gradient, the preload of the bearing increases gradually, which will lead to the adverse working condition of shortening the service life of the main shaft.
In the installation of the main shaft, the temperature of the shaft usually changes faster than that of the bearing seat, forming a temperature difference between the two parts. This is due to their different quality and heat dissipation capacity. Therefore, the shaft and inner ring spacer expand faster than the bearing pedestal and outer ring spacer. With the axial expansion of the shaft and the elongation of the inner ring spacer, the axial load on each bearing increases and continues to increase until the thermal balance is reached. When the heat transferred by the bearing is balanced with the heat generated by the system, the temperature of the bearing seat can be stable. Therefore, if the temperature of the bearing seat is too high, the temperature of the bearing is also very high.
In the face-to-face installation of the bearing, Bearing the shaft expands radially and axially, and the inner ring spacer is longer, which expands faster than the outer ring spacer. This thermal expansion will cause additional axial load on the two inner rings, increasing the preload of the bearing.
