For Light Series Deep groove ball bearings( shown as 618 series and 619 series below) seal ring or shield should only be added on basic bearing. Apart from the differences of designing seal groove on the outer ring, the outer ring rib tolerance D2 , inner ring rib diameter tolerance d2 and different requirement of symmetry degree caused by the outer ring ring raceway other sizes of inner ring and outer ring such as steel ball, cage and rivet are completely the same as basic Deep Groove Ball Bearing.
The grooves for seal ring and dust cover on the outer ring of Deep Groove Ball Bearings are designed samely. The inner ring ribs are commonly used. The outer diameter sealing lip for contact sealing ring and that for noncontact sealing ring are designed samely.
Shield adopts outward rolling (radial oddnumber) and inward bent structure.SThe smallest width of outer ring seal groove rabbet is 0.5mm a few small type adopt 0.3mm.
The distance between the cage and inner diameter lip of seal ring should not be larger than 0.3mm
According to features of 618 series and 619 series b1 the top width of seal groove, seal ring skeleton steel plate thickness SH, the distance between rubber surface of seal ring and bearing surface, the rubber thickness of seal ring and inner ring rubber thickness skelenton inner diameter are reduced a certain amount on the basis of optimizing value of light medium and heavy series.Thus structure and specialty requirement for super light and ultra super series are satisfied.
