How to choose NSK bearings in industrial use

The use of rolling bearings of various mechanical devices, instruments and other requirements of the performance of the market has become increasingly stringent requirements for the NSK bearing conditions, the performance is also increasingly diverse. In order to select the most suitable bearing from the large number of structures and sizes, it is needed to study from different angles. In the selection of a bearing, in general, consider as a shafting bearing arrangement, installation and disassembly difficulty, bearing allows the space, size and bearing market, roughly determine the bearing structure. Secondly, while the comparative study of the use of bearing a variety of mechanical design life and bearing a variety of different endurance limit, while determining the bearing size. When selecting a bearing, the fatigue life of the bearing is often only considered, and the life, wear and noise of the lubricating grease which is caused by the aging of the grease need to be fully studied. Furthermore, according to different purposes, it is necessary to choice of precision, clearance, keep frame structure, grease and so on, special design of bearing. However, the choice of bearing does not have a certain order, rules, priority should be given to the requirements of the bearings are the conditions, performance, the most relevant issues, is particularly practical.

Influence of configuration of imported bearings bearing arrangement on the rigidity of bearings is also great, generally said, for centripetal thrust ball bearings and roller bearings, the paired use the occasion to take the big end surface of the outer ring relative (i.e. the pressure line a pressure tip outwards) configuration. This configuration bearing anti overturning moment capacity, temperature changes in the adjustment of preload less change.

For only the stamping outer ring needle roller bearings, because of the outer wall is thin, it is best not to hammer to install, use the press to press. Because the hand hammer, uneven pressure, easy to produce local deformation of needle roller bearing outer ring.

Cross fixation is a kind of bearing configuration, in which each NSK bearing is positioned on the axis, and the direction is opposite. This combination is mainly used for short axis. All at least able to withstand a direction of the axial load and radial bearings are applicable, including deep groove and angular contact ball bearings, cone roller bearings and NJ type cylindrical roller bearing and use angle contact ball bearing or tapered roller bearing, in some cases must pre load is applied.

Shaft is in two bearings in radial and axial support, the bearing of one side said for the fixed end bearings, which are subjected to both radial and axial loads, play the role of the fixed shaft between the bearing box and the relative axial displacement. The other side is called the free end, only to bear the radial load, the axial can move relative to the other side.

Fixed end bearing must also with the shaft and the bearing box is fixed, the suitable bearing can bear radial load composite bearing, for example, deep groove ball bearings, spherical roller bearings and double row or matched angular contact ball bearings and tapered roller bearings. Under pure radial load radial bearing combination, such as inner and outer rings without rib of cylindrical roller bearings and deep groove ball bearing or four point contact ball bearing or two-way thrust bearing combination, can also be used as fixed end bearing. At this time, the second bearings provide two-way axial positioning, but must be installed with the bearing box to maintain a certain radial interval. Free end bearing in the shaft due to thermal expansion, changes in the length of the bearing will not occur in the extrusion. Axial displacement can occur in the bearing, also can occur NSK bearing ring and bearing seat.