Improved lubricating structure for rolling mill universal spindle

The utility model belongs to the improvement in lubricating structures of universal shafts of rolling mills in iron and steel plants and particularly relates to an improved lubricating structure for a rolling mill universal spindle. A slotted hole matched with a copper sliding block is formed in a connecting end shaft of the universal spindle, an oil retainer is fixedly arranged on the portion, located inside the slotted hole, of the connecting end shaft of the universal spindle, a longitudinal annular sealing groove is formed in the inner ring face of the oil retainer, an O-shaped sealing ring is installed in the sealing groove and matched with the connecting end shaft of the universal spindle, the oil retainer is composed of split type oil retainer bodies, and the split type oil retainer bodies are connected into a whole through bolts. The improved lubricating structure is reasonable, the sealing performance is good, it can be guaranteed that lubricating parts of the universal spindle are well lubricated, normal operation of equipment is not affected, the structure is simple, and disassembly and assembly are convenient.