End cover oil-injection three-phase asynchronous motor

An end cover oil-injection three-phase asynchronous motor belongs to the field of motor manufacturing. The end cover oil-injection three-phase asynchronous motor comprises the components of a motor body, a shaft extension, an end cover, an oil injecting hole and a hole plug. The oil injecting hole is arranged on the end cover and is used for communicating between the inner part and the outer part of the end cover. One end, which is arranged outside the end cover, of the oil injecting hole is provided with an internal screw thread; and furthermore the hole plug is inserted. The internal screw thread of the oil injecting hole is connected with a sleeve. The sleeve is connected with oil injecting pipeline. The oil injecting pipeline is connected with oil injecting holes of a plurality of motors and simultaneously performs oil injection. For aiming at a specific structure in designing a steel roller bed, through connecting a plurality of three-phase asynchronous motors with the oil injecting pipeline, and arranging the oil injecting hole at the end of the shaft extension end, same-side unified oil injection of the roller bed is realized.