Deep groove ball bearings are the most widely used type of rolling bearings. Its characteristics are low frictional resistance, high rotational speed, and can be used on components that can withstand radial loads or combined radial and axial loads, as well as on components that can withstand axial loads. The basic deep groove ball bearing consists of an outer ring, an inner ring, a set of steel balls, and a retaining structure. There are two types of deep groove ball bearings: single row and double row. The deep groove ball structure is also divided into sealed and open structures. Open type refers to the bearing without a sealing structure, and sealed deep groove ball is divided into dustproof seal and oil-proof seal. The dustproof sealing cover material is made of steel plate stamping, which only serves to prevent dust from entering the bearing raceway. The oil proof type is a contact type oil seal, which can effectively prevent the leakage of lubricating grease inside the bearing.