Pressure relief type deep groove ball bearing

The utility model relates to the technical field of deep groove ball bearings, and discloses a pressure relief type deep groove ball bearing which comprises a bearing outer ring and a bearing inner ring located in the middle of the bearing outer ring, a plurality of rolling steel balls are arranged between the bearing outer ring and the bearing inner ring, and a first retainer and a second retainer are symmetrically distributed on the two sides of the outer wall of each rolling steel ball. A first sealing piece and a second sealing piece are arranged on the outer walls of the ends, away from each other, of the first retainer and the second retainer respectively, the bearing inner ring further comprises a pressure relief hole formed in one side of the surface and pressure relief grooves formed in the two ends of the journal, and a sealing block is connected into the pressure relief hole in a sealed mode. According to the deep groove ball bearing, the pressure relief holes and the pressure relief grooves are fo