| 摘要 |
A seal for a tapered roller bearing has a seal case which fits onto the bearing cone and an elastomeric seal element which is bonded to the case and has a primary sealing lip in contact with the front face of the bearing cup. The seal case includes a doubled back axial portion which fits around the thrust rib on the cone and is composed of inner and outer segments joined together at a tight bend. The inner segment embraces the thrust rib and has an inwardly directed radial flange extended from it, this flange being positioned against the cone back face. The outer segment lies against the inner segment immediately beyond the tight bend and has an outwardly directed radial flange which aligns with the inwardly directed flange. The seal element projects outwardly from the outer flange. The axial installation force required to press the axial portion of the seal case over the thrust rib is applied to both flanges and hence is transmitted through both the inner and outer segments. This avoids bell mouthing of the seal case and the accompanying inclination of the seal element. It further improves retention, while permitting the seal case to be pressed over thrust ribs manufactured with liberal tolerances.
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