The present invention discloses a gearbox for a large-torque four-in-one
injection molding machine, which relates to the field of
gear transmission and comprises a box body, wherein support seats are symmetrically arranged at the bottom of the box body, notches are evenly arranged on the outer surface of the box body, an input mechanism is fixedly connected to the back of the box body, an output mechanism is fixedly connected to one end of the box body away from the input mechanism, a main motor is fixedly connected to the outer surface of the input mechanism, and an oiling mechanism is evenly arranged on the inner wall of the box body. First, a
servo motor drives the output mechanism to work, thereby realizing different coordination between the output mechanism and the input mechanism, thereby controlling the working power of the
injection molding machine, and while the output mechanism is working, the oiling mechanism is also driven to work, thereby cooling and lubricating the output mechanism and a transmission structure in the output mechanism.