New vibratory bearing from NSK
EMM-VS series offers 30% higher load ratings and up to twice the life of conventional designs
NSK have introduced the EMM-VS series of cylindrical roller bearings (CRB) for vibrating equipment. The bearings have a 30% higher load rating compared with conventional CRB bearings and offer up to twice the bearing life, which means that, in many applications, bearings can be downsized to reduce costs without affecting machine performance or bearing life.
The EMM-VS series bearings are available in standard ISO sizes and feature a special 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 harmful skewing of the rollers to a minimum. In addition, large cage pocket corners relieve stress concentrations on the cage. Together, these features reduce thermal effects within the bearings and help minimize resonance from induced vibrations.
The cage pocket design also improves grease or oil flow within the pockets, and the resulting improved dispersion of lubricant delivers the additional benefit of dampening noise.
NSK say 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 longer operating life. The same feature also allows the bearings to cope with misalignment between shaft and housings, effectively addressing another key area where damaging stress concentrations may occur.
