Cage for tapered roller bearings

A tapered roller bearing comprising an outer ring with an annular inwardly facing outer raceway, an inner ring inside the outer ring with an annular, outwardly facing inner raceway, the inner ring raceway having axially inwardly facing opposite, spaced apart flanges;

• a row of tapered bearing rollers disposed between the inner raceway and the outer raceway for rolling thereover and disposed in the space in the inner ring between the flanges;
• a cage comprising a radially smaller annular ring disposed at the radially smaller side of the row of rollers, a radially larger annular ring disposed at the radially larger side of the row of rollers, a plurality of webs disposed at intervals around the rings of the cage for joining the cage rings, and a respective web being disposed between neighboring rollers in the row of rollers for separating the rollers;
• one of the side rings of the cage being undulating in shape annularly around the ring with successive undulations undulating axially inwardly toward the rollers and axially outwardly from the rollers, the undulations on the one ring being placed for defining axially inwardly projecting crests on the undulations and the crests are each being respectively located at a respective axial end of one of the rollers, and the one side ring being shaped and placed for the undulation crests to apply force against the rollers and being slightly prestressed for urging the rollers toward the other side ring and toward the inner ring flange at the side of the rollers away from the one ring;
• each of the webs having a generally radially inwardly directed projection which also extends axially outward and engages the one inner ring flange at the one side ring of the cage, the projections having axial end surfaces which engage the one flange;
• the crests on the undulations have tips which engage the adjacent ends of the rollers;
• the distance between the plane which passes through the axial end surfaces of the radial projections from the webs and the plane defined by the tips of the undulation crests is slightly greater than the difference between the distance apart of the flanges of the inner ring and the length of the rollers disposed between the flanges.