Connecting axle structure of cross-axle universal joint

The utility model discloses a connecting axle structure of a cross-axle universal joint, which is characterized in that a connecting groove is respectively arranged at the two sides of a connecting axle, and at least one rib is arranged on the surface of the connecting groove; the two walls of the connecting groove are internally concave to form depressions, and simultaneously the two walls of the opening of the connecting groove form projections; a groove corresponding to the rib is arranged on one end surface of a connecting end, and the rib is exactly clamped in the groove, and pits corresponding to the projections are arranged on the two outer side walls of the connected end; the projections are exactly clamped in the pits, and shoulders are formed on the two outer side walls of one end of the connecting end; and gradual transitions are arranged between the shoulders and the two outer side walls of the connecting end. In the specific implementation, the shoulders are accommodated in depressed spaces, the