ntn bearing support options to pay attention to a few
Support choose to pay attention to 4 Questions:
1, how to limit the location of axes, including the radial and axial position are the first issues to consider. A general multi-axle double-supporting structure, the axis of the radial position supported by the two co-limited, each supporting Department should have played the role of radial positioning or angular contact bearings to the heart.
2, the axial position of the various constraints supported by the two axial displacement in one direction is also supported by a limited axial displacement in both directions, under normal circumstances, different methods available to the different axial positioning accuracy of the operation. Therefore, the design of supporting structure shall be based on the accuracy of the operation shaft and working conditions, choose the axial location of the specific programs.
At the same time to bear radial load and axial load cases, often with angular contact bearings and tapered roller bearings bearings installed in pairs. Angular contact bearings installed in pairs arranged in three ways. Two bearing outer wide-face relative to install that back to back installation. Two load-bearing role of the point falls outside the bearing span. This arrangement for supporting span large, when the steel cantilever axis is good, axial elongation when heated, the outer ring was torn off and the trend, which axis will not be stuck, so the use of more widely accepted. Should the use of pretension, but installed in the shaft when the preload amount of heating will be reduced. Two bearing outer ring is relatively narrow face, said face to face with installation installation.
Force supporting the role of two-point falls within the bearing span. This arrangement of simple structure, Assembly and Disassembly, it is easy to debug than those in use was also more extensive, mainly for short axis and temperature is not high occasions, but note that clearance must be left back. Axial clearance is also not be too big, over-running accuracy of the General Assembly to reduce the shaft.
3, when the axial load a larger number of bearings required to bear the same time, the regular use of bearing outer ring width and a relatively narrow surface installation in series mode. The bearing force landed the role of points are on the same side so that the bearing arrangement known as tandem in the same direction. When using such an arrangement should pay attention to the structure and manufacturing to ensure that each bearing can bear the load as even as possible.
4, the machine in operation, the general spindle or shaft of the temperature is higher than the temperature of adjacent components, which will heat up elongation axis. In order to maintain flexibility in the rotation axis, in the supporting structure design, the axial positioning accuracy to meet the requirements, we must also take into account the free telescopic shaft heating requirements. Axial position and axial stretching of the way to correspond.
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