Plunger motor main shaft with spline transmission structure

The utility model discloses a plunger motor main shaft with a spline transmission structure. The plunger motor main shaft comprises a main shaft body, wherein a spline used for connection transmission is arranged at one end of the main shaft body, a connecting plate is arranged at the other end of the main shaft body, a central ball socket matched with a central plunger is formed in the center of the connecting plate, the periphery of the central ball socket protrudes outwards to form a boss, ball sockets matched with plungers are formed in the positions, located on the periphery of the central ball socket, on the connecting plate and are distributed circumferentially, and the connecting plate is further provided with fixing holes used for fixing a press plate. The plunger motor main shaft with the spline transmission structure has the advantages that the structure is simple, transmission is reliable, and the rotating speed is high; the spline is adopted for connection transmission, transmission is reliable, and borne torque is large; the periphery of the central ball socket protrudes outwards to form the boss, the sectional area of the central ball socket is made to be larger than a semicircle, the effect that the central ball socket wraps the ball head of the central plunger is achieved, and thus the central plunger is connected more reliably and more stably.