Products

Bearings for vibratory applications - SKF

  • are available in the 223 series
  • are available with a cylindrical or tapered bore
  • have C4 radial internal clearance as standard
  • are equipped with an annular groove and three lubrication holes in the outer ring
  • are available with a PTFE coated cylindrical bore (designation suffix VA406), which prevents fretting corrosion between the shaft and the bearing bore, for shaft thermal elongation in non-locating bearing positions that have a rotating outer ring load. Therefore, shafts do not require special heat treatments or coatings.
  • are manufactured to one of the following designs:
    • E/VA405 bearings have two surface-hardened stamped window-type steel cages, an inner ring without flanges and a guide ring centred on the inner ring or on the cages
    • EJA/VA405 and CCJA/W33VA405 bearings and have two surface-hardened stamped window-type steel cages, an inner ring without flanges and a guide ring centred on the outer ring raceway

Acceleration 
Vibratory applications induce accelerations of the rollers and cages in the bearings. This puts extra demands on the bearing design. SKF spherical roller bearings for vibratory applications can withstand considerably higher accelerations than corresponding standard bearings. The permissible acceleration depends on the lubricant and the mode of acceleration.

  • Mode 1

    The bearing is subjected to a rotating outer ring load in combination with a rotating acceleration field, or an internally induced angular acceleration field due to rapid speed variations. These accelerations cause the unloaded rollers to generate cyclic loads on the cages. Examples: vibrating screens, exciters, planetary gears and general arrangements subjected to rapid starts or rapid speed variations. 

  • Mode 2

    The bearing is subjected to impact loads, which generate a linear acceleration in a constant radial direction, causing the unloaded rollers to “hammer” the cage pockets. Example: acceleration generated when rail wheels roll over rail joints.

Road rollers, where the roller is vibrating against a relatively hard surface, are subjected to a combination of mode 1 and 2 acceleration. 

System solutions for vibrating screens
In addition to single bearings for vibrating screens, SKF has developed fault detection and bearing arrangements that can improve performance, reduce maintenance and monitor machine condition in vibratory equipment.

Further downloads, documentation available on request
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