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1. A deep groove ball bearing with a cage, comprising an outer ring, an inner ring, the cage, and steel balls, wherein the cage is provided between the outer ring and the inner ring, pockets are formed in the cage, the steel balls are placed in the pockets, the cage is split into an upper cage body and a lower cage body, pocket grooves are formed alternately in each of the upper cage body and the lower cage body, pocket grooves in the upper cage body and the lower cage body are combined correspondingly to form the pockets, a connecting portion is provided between adjacent pocket grooves in the lower cage body, a positioning portion is provided between adjacent pocket grooves in the upper cage body, an insertion piece and an insertion groove are provided between the connecting portion and the positioning portion, the insertion piece and the insertion groove are configured to be fixed with each other to form a fixed connection between the lower cage body and the upper cage body; wherein the insertion groove is formed in the positioning portion of the upper cage body, a bump is provided in the insertion groove, the insertion piece is provided on the connecting portion of the lower cage body, a clamping member is provided on an end portion of the insertion piece, the clamping member is clamped between the bump and a bottom of the insertion groove; wherein the bump is arranged adjacent to an inserting port of the insertion groove; wherein a positioning piece being respectively provided on opposite sides of the insertion piece, each of the positioning pieces being elastic, and an accommodating groove is formed in a position within the insertion groove on opposite sides thereof and corresponding to each of the positioning pieces; wherein the insertion groove communicates with the pocket groove through the accommodating groove, and an oil storage cotton is provided within the accommodating groove.
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