Vibrating Screen Bearings with VA406 Design

For machines with inherent eccentric motion such as vibrating screens and compactors, TKW developed the range of strong and robust spherical roller bearings for vibratory applications. The bearing are available in the 223 series with cylindrical or tapered bore for 40 to 240 mm shafting. In recent years they were uprated to the E specifications. and have proven to reduce the operating temperatures and extended the service life of the machinery. Operating temperatures have been observed to be 5 to 10 °C cooler than the bearings having the previous design with one or two piece brass cages. Bearing service lives have been observed to increase by a factor of two. The choice of spherical roller bearing depends on the vibration level developed by the vibrating screen, feeder, or compactor.

• The TKW standard E design spherical roller bearing has proved to be effective at lower vibration levels.

The spherical roller bearings for vibratory applications have two window type hardened steel cages and a floating guide ring between the row of rollers. This allows independent motion of the rollers to minimize friction. Larger size bearings, d > 70 mm, have an outer ring centred guide ring to support and guide the cages. This provides the lowest friction in the bearings and is demonstrated by more than ten years successful experience operating these bearings in vibratory applications. The bearings are manufactured to the E design in the range 40 ≤ d ≤ 110 mm – larger bearings are manufactured to the CC design. The bearings with d > 85 mm are made from the patented High Quality material for increased service life and increased wear and abrasion resistance. This feature is particularly important in the highly contaminated vibration screen, feeder and compacting equipment environment. They can replace vibratory bearings having specialty steels or surface treatments, and case hardened materials and other special heat treatments.

223 series EJA/VA405 The bearings in the size range 22315 through 22322 have the EJA/VA405 design with nitrocarburized surface-hardened, window-type steel cages and a nitrocarburized surface hardened, floating guide ring (suffix JA), between the cages and the two rows of rollers, centred in the outer ring. Designation example: 22320 EJA/VA405 223 series CCJA/W33VA405 The bearings in the range 22324 through 22348 have the CCJA design with nitrocarburized surface-hardened, window-type steel cages and a nitrocarburized surface hardened, floating guide ring (suffix JA), between the cages and the two rows of rollers, centred in the outer ring. The guide ring guides the rollers and centres the cages. Designation example: 22324 CCJA/W33VA405 223 series variant with PTFE coated bore (suffix VA406) The TKW spherical roller bearings for vibratory applications are optionally supplied with a PTFE coated cylindrical bore (suffix VA406). In all other respects these bearings are similar to the bearings with suffix VA405 and fully interchangeable. The PTFE bore coating adds favourable cost saving advantages to the application:

• virtually eliminates fretting corrosion

• makes it possible to eliminate special features or shaft sleeves on the shaft aimed at reducing fretting corrosion damage

• avoids induced axial forces in the bearing arrangement

TKW Can manufacturer Full series Spherical Roller Bearings for Vibrating Screen Applications.

Benefits of TKW Vibrating Screen Bearings

-- Twice the service life of conventional bearings

-- Reduced maintenance costs

-- High dynamic & static load ratings - load rating increased by 1.25 times

-- Dampened vibration & highly resistant to heavy or shock loads

-- High speed performance & low operating temperature rise

-- Better roller guidance & smooth running - reduced bearing damage from slippage, surface fatigue, flaking