NSK EMM-VS Series Cylindrical Roller Bearings (CRBs)
NSK has introduced the EMM-VS Series cylindrical roller bearings (CRBs), which are designed for use in vibrating equipment such as gearboxes, gear drives and steel-making machinery.
The bearings, which are available in standard ISO sizes, have a 30 per cent higher load rating compared with conventional CRBs and offer up to twice the bearing life.
NSK claims these performance advantages mean that, in many applications, bearings can be downsized to reduce costs without affecting machine performance or bearing life.
They feature an outer-ring-guided, one-piece, machined brass cage that gives higher strength and rigidity under vibrating conditions, plus the additional qualities of improved wear life and resistance to corrosion.
The one-piece VS Series brass cage ensures accurate guidance of the rollers via special cage pocket profiling, reducing the harmful skewing of the rollers to a minimum.
In addition, large cage pocket corners relieve stress concentrations on the cage.
Combined, these features reduce thermal effects within the bearings and help to minimise resonance from induced vibrations.
The cage pocket design also improves grease or oil flow within the cage pockets, and the resulting improved dispersion of lubricant delivers the additional benefit of dampening noise.
The synergy of the EMM-VS Series design is completed by a special crowning of the bearing rollers; this eliminates stress concentrations at the roller ends, helping the bearings to accommodate heavy loads and provide a longer operating life.
The same feature also enables the bearings to cope with misalignment between shaft and housings, effectively addressing another key area where damaging stress concentrations may occur.
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