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The problem of how to limit the position of the axis, including radial and axial position is the first thing to consider. General axis of the use of dual-supporting structure, the radial position of the shaft by two supporting limited, each bearing should have played the role of radial positioning at the heart or angular contact bearings. Axial position by two supporting each restrict a direction of the axial displacement can also be a support to limit the axial displacement of the two directions, in the general case, different axial positioning of different running accuracy can be obtained. Therefore, the design of the supporting structure should be based on the accuracy of the axis operation and working conditions, select the axial positioning of specific programs.
Machine in operation, generally the temperature of the spindle or drive shaft is higher than the temperature of the adjacent parts, and thus the axis will heat up elongation. In order to maintain the axis of rotation flexibility in the design of the supporting structure, at the same time meet the axial positioning accuracy requirements, but also consider the free retractable shaft heat requirements. Corresponding axially positioned and axially retractable manner.
Adjust the bearing clearance is to control the running accuracy of the shaft. Shaft axial position adjustment in order to meet the special requirements of some meshing transmission. For example: in the worm drive, the worm axis must fall within the intermediate plane of the worm wheel in order to ensure its correct engagement, thus requiring the worm shaft can adjust its position in the axial direction. Bevel gear drive, two bevel gear section tapered cone vertex must coincide, and thus requires two bevel gear shaft axial adjustment can.
In both radial and axial load case, the support is often used in the installation of angular contact bearings and tapered roller bearings in pairs. Angular contact bearings installed in pairs of three types of alignment. Two bearing outer ring width facing installation known as back-to-back installation. Two load-bearing role of point falls supporting span beyond. Support span, this arrangement shaft cantilever when steel is good, the axis thermal elongation, the outer ring was disengaged, and thus the axis will not get stuck, it is more widely used. But should pretension install, in the heat of the shaft preload volume will be reduced. Two narrow end face of the bearing outer ring is mounted opposite said face-to-face installation. Two supporting force point falls within the support span. The simple structure of this arrangement, assembly and disassembly, debugging therefore used more widely than those of convenience, is mainly used for the short-axis and high temperature rise of occasions, but must pay attention to spare clearance left. Axial clearance should not be too large, over the General Assembly to reduce the running accuracy of the shaft. The bearing outer ring is often used when the axial load is large, requiring multiple bearings to withstand wide, narrow face relatively installed in series. The bearing force points fall on the same side of the bearing it said the same series also known to the arrangement. In this arrangement to pay attention to the structure and manufacturing can be as much as possible to ensure that each bearing loads evenly.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 7213B NSK | 65 | 120 | 23 |
| 7213A NSK | 65 | 120 | 23 |