By optimising the contact geometry between the rolling elements and the ring raceways, Schaeffler’s new ‘Generation C’ deep groove ball bearings are quieter, more energy efficient and offer increased lubricant life.
A range of new deep groove ball bearings has been developed that offer 35 per cent less friction and 50 per cent less noise than their predecessor. In addition, the new bearings benefit from more effective sealing and a riveted steel cage.
The new design improvements mean that Schaeffler’s new ‘Generation C’ FAG deep groove ball bearings can achieve higher running speeds and efficiencies, whilst simultaneously increasing the life of the bearing and reducing energy consumption.
In order to minimise friction, Schaeffler optimised the osculation (raceway curvature) between the balls and rings on the Generation C bearings. This means there is less chance of misalignment between the inner and outer ring. As well as offering 35 per cent less friction, the bearings generate less heat, making them suitable for higher running speeds. The bearings are therefore ideal for applications in which low noise and smooth running are critical, for example, electric motors, power tools, ventilators and washing machines, where reduced friction and improved energy efficiency of the bearings lead to a reduction in operating costs and a more efficient machine with extended maintenance intervals.
Schaeffler also modified the seal on the Generation C bearings. The new novel HRS seal has modified double lip geometry and is made from nitrile butadiene rubber. They are adjusted to match the recess on the bearing inner ring. Axial contact between the inner ring and the seal means more effective protection against contamination or loss of grease and less frictional torque. This results in longer grease life, increasing the life and reliability of the bearing and provides improved bearing performance at higher speeds (rpm).
Venting grooves have also been added in order to improve the run-in behaviour of the bearings. In addition to the HRS seal, the bearing shield has been modified. The recesses on the bearing rings and the shield geometry are functionally adjusted to each other in such a way that the sealing efficiency is improved and grease life increased. The new design creates an axial and radial labyrinth with the shield.
The improved guidance of the rolling elements also contributes to higher performance of the bearing. The new riveted steel cage, which replaces the previous steel ‘ribbon’ cage, offers higher rigidity and so is suitable for higher running speeds. The riveted steel cage also reduces noise levels and means the bearing is less sensitive to shock loads. The manufacturing tolerance of the bearings has also been increased (to P5 Abec 5 standards), ball roundness to G5 tolerances and improved surface finish.
The dimensions of the new bearings correspond to the previous bearing types, enabling easy replacement. Generation C bearings can operate in temperatures from –30°C up to +120°C.
The bearings are available with outside diameters from 26mm up to 90mm. Riveted steel cages are standard, although polyamide cages are optional. P6 or P5 tolerances can be specified on ordering. Sealing options include one or two gap seals; one or two lip seals; or low friction, non-contact labyrinth seals.
For more information on Schaeffler’s ‘Generation C’ FAG deep groove ball bearings, please visit www.FAG-GenerationC.de or telephone the marketing department on 0121 351 3833.
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