Tapered Roller Bearing - PDF 1

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posted:4/16/2012
language:English
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Description: The present invention relates to tapered roller bearings that can be used as bearings of gear shaft supporting devices for vehicles, such as differentials and transmissions of automotive vehicles.BACKGROUND ART A tapered roller bearing comprises main components including: an inner ring having a raceway surface on its radially outer surface and further having a cone front face rib and a cone back face rib on axially opposite sides of the racewaysurface; an outer ring having a raceway surface on its radially inner surface; a plurality of tapered rollers interposed between the raceway surfaces of the inner and outer rings; and a cage having pockets for containing and holding the tapered rollers. The cage includes: a small annular portion that is continuous on the small end face side of the tapered rollers; a large annular portion that is continuous on the large end face side of the tapered rollers; and a plurality of bars that connect the smalland large annular portions. Each pocket is formed between adjacent ones of the bars and has a trapezoidal shape having a narrow side that receives the small diameter side of the tapered roller and a wide side that receives the large diameter side of thetapered roller. Tapered roller bearings for supporting power transmission shafts of, for example, differentials and transmissions of automotive vehicles are used with their lower portions immersed in oil baths, and the oil in the oil baths that serves as alubricating oil flows into the bearings as the bearings rotate. In a tapered roller bearing used for such applications, the lubricating oil flows from the small diameter side of the tapered rollers into the bearing. The lubricating oil flowing from theradially outer side of the cage flows along the raceway surface of the outer ring and passes therethrough toward the large diameter side of the tapered rollers. The lubricating oil flowing from the radially inner side of the cage flows along the racewaysurface of the inner ring