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The connecting rod stainless steel casting connects the piston and the crankshaft, and transmits the force of the piston to the crankshaft, and converts the reciprocating movement of the piston into the rotational movement of the crankshaft. The connecting rod group of stainless steel castings bears the gas force transmitted from the piston pin, and the action of its own swing and the reciprocating inertial force of the piston group. The magnitude and direction of these forces change periodically.

The connecting rod body is composed of three parts, the part connected with the piston pin is called the connecting rod small end; the part connected with the crankshaft is called the connecting rod big end, and the rod connecting the small head and the big end is called the connecting rod shaft. The small head of the connecting rod is mostly a thin-walled circular ring structure. In order to reduce the wear between the piston pin and the piston pin, a thin-walled bronze bush is pressed into the small head hole. Drill or mill grooves on the small head and the bushing so that splashed oil will enter the mating surface of the lubricating bushing and the piston pin.

The connecting rod shaft is a long rod, which is also subject to greater force during work. In order to prevent its bending and deformation, the shaft must have sufficient rigidity. For this reason, most of the connecting rod shafts of vehicle engines use I-shaped cross-sections. The I-shaped cross-sections can make the mass smaller when the rigidity and strength are sufficient. High-strength engines have H-shaped cross-sections. Some engines use the small end of the connecting rod to spray oil to cool the piston, and a through hole must be drilled in the longitudinal direction of the shaft. In order to avoid stress concentration, the connection between the connecting rod shaft and the small end and the large end adopts a large arc smooth transition.

In order to reduce the vibration of the engine, the quality difference of the connecting rod of each cylinder must be limited to a small range. When the engine is assembled in the factory, the unit of measurement is generally based on the mass of the large and small connecting rods. The same set of connecting rods. On the V-type engine, the corresponding cylinders in the left and right rows share a crank pin, and the connecting rods have three types: parallel connecting rods, fork connecting rods, and main and auxiliary connecting rods.