Bearings for Vibratory Applications

Vibratory applications such as vibrating screens or exciters, induce accelerations of rollers and cages in the bearings. This puts extra demands on the bearing design. PK Machinery spherical roller bearings for vibratory applications can withstand considerably higher accelerations than corresponding standard bearings. The permissible acceleration depends on the lubricant and the type of acceleration whether rotating or linear acceleration.

Rotating acceleration

The bearing is subjected to a rotating outer ring load and a rotating acceleration field. This can generate cyclic loads on the cages from the unloaded rollers. Typical examples are vibrating screens and planetary gears. Road rollers are subject to a mix of rotating and linear accelerations (fig 1).

Figure 1: Road rollers

Linear Acceleration

The bearing is subjected to impact loads and thus linear accelerations. This causes hammering in the cage pockets by the unloaded rollers. A typical linear acceleration is generated when rail wheels are rolling over rail joints (fig 2). An analogous application using bearings for vibrating applications is a road roller where the roller is vibrating against a relatively hard surface.

Figure 2: Rail Wheels

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