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 bearing ring rotation load, with clearance fit installation, rotation of the needle during the mating surfaces of the rings will crawl, prone to fretting, mating surfaces will be formed at this time Burns, cracks and other damage. 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, the axial of the bearing is fixed axially closed or sector realizes with the radial tight fit, institutions supporting the free side of the bearing on the shaft is not fixed, to compensate for the system to install the axis or in the process of expansion and contraction of the size changes.
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. permanent magnetic-bearing-only passive (passive), and passive-bearing is not impossible in 3 directions, at least 1 source should be used.
7. repulsion of magnetic bearings, magnetic low utilization, a suction-type complex structure, rarely used.
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