The spherical roller bearings used in vibrating screens and vibrating equipment are not ordinary standard model, but specialized variants designed specifically for high-frequency vibration, impact load, and contaminated environment. The core selection logic is: prioritize vibration-specific series with reinforced cage, special heat treatment, and strict dimensional tolerance (such as SKF VA405/VA406, NSK VS series, and ZWZ VB type), and these are usually concentrated in the 223 series.
Vibrating screens usually use the 223 series (width and load capacity between 222 and 241, suitable for bearing composite load during vibration). In addition, if the equipment has dynamic misalignment caused by long shaft or frame deformation, spherical roller bearings should be preferred over cylindrical roller bearings, because the latter has lower tolerance for dynamic misalignment.
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To cope with vibrating conditions, these bearings are specifically strengthened on the basis of standard spherical roller bearings:
Reinforced Cage: Machined brass cages (such as solid brass or comb-shaped copper alloy) are generally adopted to withstand roller skewing and inertial force caused by vibration, and to guide the roller in smooth operation.
Special Heat Treatment and Materials: Some brands (such as NSK) apply special heat treatment to the roller to prevent crack under vibration and impact load; or use Tough Steel technology to improve service life in contaminated environment.
Strict Tolerance Control: Discrete control is applied to the outer diameter deviation, and special internal radial clearance is set (such as NSK setting at 2/3 of the ISO standard), to reduce vibration heat generation and optimize load distribution.
High Load Capacity and Vibration Resistance: Through optimized internal design, the dynamic/static load ratings can be increased by approximately 1.25 times compared with conventional bearings, to cope with the impact during startup and operation of vibrating screen.
| Inquiry | Bearing No. | Boundary dimensions（mm） | Basic load ratings(kN) | Limiting speed(rpm ) | Mass | ||||
|---|---|---|---|---|---|---|---|---|---|
| d | D | B | Dynamic(Cr) | Static(Cor) | Grease | Oil | Kg | ||
