Bearing with circulating type lubricating function

The bearing comprises a bearing outer ring and a bearing inner ring which are coaxially arranged, an annular outer limiting groove is formed in the inner wall of the bearing outer ring, an annular circulating groove is formed in the groove bottom of the outer limiting groove, an infiltrating ring is installed in the circulating groove, and the infiltrating ring is arranged in the circulating groove. An oil injection hole is formed in the outer circle face of the bearing outer ring in a penetrating mode, and the inner end of the oil injection hole communicates with the circulation groove. By the adoption of the technical scheme, the lubricating device has the advantages that lubricating oil is injected into the circulation groove through the oil injection hole, the wetting ring absorbs the lubricating oil, the lubricating oil is wiped on the balls through the wetting ring by means of self-rolling of the balls, operation is easy and convenient, and the lubricating and maintaining effect of the bearing is excell