| 摘要 |
A bearing, such as a tapered roller bearing, has races provided with opposed raceways and rollers which lie in a circular row between the races and have side faces along which they contact the raceways. In addition, the bearing has a rib provided with an abutment face located at the end of one of its raceways. The ends of the rollers contact this face, and here the bearing experiences its greatest friction. Even though the bearing loses its normal supply of lubrication, it still will not be damaged by the friction between the end faces of the rollers and the abutment face of the rib, since it contains a supplemental source of lubrication. To this end, the bearing includes a lubricating ring having a band which extends across the end faces of the rollers and tabs which project from the band into the spaces between the rollers so as to be presented opposite the abutment face on the thrust rib. The band carries a substance which holds a lubricant, and this substance contacts the end faces of the rollers to release its lubricant to the roller end faces should the bearing lose its normal supply of lubrication. Likewise, the tabs carry a substance which holds a lubricant, and this substance contacts the abutment face of the thrust rib, releasing its lubricant to the abutment face when the bearing loses its normal supply of lubrication. Thus, the critical surfaces of the bearing remain lubricated even when the normal supply of lubrication for the bearing is interrupted or fails. |
