Bearing if no select errors Xia to accurate using if, to plane needle roller bearings of using life zhiqian, can using is long a time on the, also has accident of early injury, and by can't using of early injury, as the early injury of causes, has using lubrication Shang consider of enough, turn also has foreign body intrusion, SKF bearing assembled of errors and axis of deflection large, and on axis and bearing box of research enough, can said, these causes each other coincide of situation comparison more.
Design using various mechanical service life and durability of bearing limits of comparative study, and decided the bearing size. Selecting bearings, plane needle roller bearings tend to think that the grease life in old and weak, fatigue life of oil, abrasion resistance, low noise, also needs to be fully studied.
When the FAG bearing ring rotation load, such as clearance fit installation, plane needle roller bearings rotate during the mating surfaces of the rings will crawl and easy fretting, mating surfaces are flush Burns, cracks and other damage at this time. Therefore, bearing rings under rotating load and mechanical parts of the shaft or bore combined with interference fit.
Machinery in supporting parts, plane needle roller bearings in radial, circumferential and axial (tangential) three directions are different requirements for the positioning fixation. Under normal circumstances, NSK bearing closed of axial fixation is the axial or radial tight fit for departments to implement, institutions supporting the liberal side tend to be fixed in axial bearing, to compensate for the system to install the axis or to avoid dimensional changes in the process.
1. support high precision, not working, and reliable.
2. under the environment of high temperature, cryogenic and vacuum operation.
3. the complex structure of requirements provided harsh environment magnetic interference, but not other forms of pollution.
4. friction small, low power consumption, ultra high-speed operation.
5. Gage-bearing only is active (active).
6. type permanent magnet bearing only a passive type (passive), and passive-type bearings will not be impossible in 3 directions, at least 1 source type should be used.
7. repulsion of magnetic bearings, magnetic low utilization, a suction-type complex structure, rarely used.
8. pure electro-magnetic-bearing can only be 5 degrees of freedom control bearings, the volume, quality and power consumption are relatively large.
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