Piston and connecting rod assembly structure

The utility model relates to an assembly structure of a piston and a connecting rod, and relates to the technical field of automobile design and manufacturing. The assembly structure of the piston and the connecting rod comprises a piston pin, a piston main body and a connecting rod assembly, a through pin seat hole is formed in the piston main body, the small head end of the connecting rod assembly is arranged in the piston main body, and a connecting rod small head hole is formed in the small head end of the connecting rod assembly; the piston pin penetrates through the pin seat hole and the connecting rod small end hole and is in clearance fit with the pin seat hole and the connecting rod small end hole. The distance from the periphery to the center of a 90-degree sector of the cross section of the piston pin is gradually reduced to form a locally thinned structure and form a long diameter and a short diameter. According to the assembly structure, larger movement gaps are formed between the piston pin and