| 摘要 |
A seal is particularly suited for closing the ends of an antifriction bearing which is located on a journal where its inner races are captured between wear rings and backing elements having overhangs which are directed back toward the end of the bearings and, as such, encircle the wear rings. Indeed, a seal exists at each end of the bearing for isolating the annular space between the inner and outer races of the bearing. Each seal includes a case that is fitted into the end of the outer race and projects axially from that race as well as radially inwardly toward the wear ring. In addition, it has two elastomeric lips which are presented toward the wear ring, one being configured primarily to retain lubricant in the annular space between the two races of the bearing and the other to exclude contaminants from that space. The seal also has an elastomeric spray shield which is attached to the case and projects radially outwardly from it toward the overhang. Indeed, the inwardly presented surface of the overhang deflects the shield back toward the end of the bearing. The elastomer of the shield may have low resistance to abrasion, in which case, it wears away until it offers very little resistance to rotation, or it may have a high compression set, in which case, it acquires a permanent deformation and again offers very little resistance to rotation.
|
