Ball bearing is a kind of rolling bearing. The spherical alloy steel ball is installed between the inner steel ring and the outer steel ring to reduce the friction during the power transmission process and improve the transmission efficiency of mechanical power by rolling. Ball bearings cannot withstand large heavy loads and are more common in light industrial machinery. Ball bearings are also called ball bearings. Ball bearings are usually used in low-load mechanical transmission equipment. Because the bearing area of the ball bearing is small, serious mechanical damage is very likely to occur in the case of high-speed operation, so needle roller bearings are often used in heavy-load mechanical transmission to increase the bearing surface, improve the mechanical transmission efficiency and reduce mechanical damage.