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Definition of Engine Connecting Rod

Connecting rods are vital components for both gasoline and diesel engines. They come in various types and large quantities, with the highest demand stemming from automobile engines.

Automobile engine connecting rods are typically crafted from 45# steel or 40Cr alloy steel. Among cast iron materials, ductile iron stands out as the top choice, often employed for the connecting rods of low-speed diesel engines.

Given the stringent mechanical demands on connecting rods, forging is the preferred manufacturing method. Connecting rods for automobile engines are small forgings that require mass production.

Structure of Engine Connecting Rod

Connecting rods are slender, non-circular rods with variable cross-sections. The cross-section of the rod body tapers from the big end to the small end to accommodate the rapidly fluctuating dynamic loads during operation. A connecting rod comprises three parts: the big end, the rod body, and the small end. The big end of the connecting rod is split, with half integrated into the rod body and the other half being the connecting rod cover. The connecting rod cover is fastened to the crankshaft main journal using bolts and nuts.

Advantages of Engine Connecting Rod

Aluminum alloy connecting rods offer notable advantages such as light weight, high strength, and corrosion resistance. By using these connecting rods, the overall weight of the engine can be reduced, effectively enhancing the engine's power-to-weight ratio.

Function of Engine Connecting Rod

The connecting rod is an essential part of the engine's structure. The reliable operation of the engine, as well as the reduction of losses and noise, largely hinges on the quality and precision of the connecting rod.

Functioning as a link between the piston and the crankshaft, the connecting rod transfers the force acting on the piston to the crankshaft, transforming the piston's reciprocating motion into the crankshaft's rotational motion. It serves as one of the primary transmission components of an automobile engine, transmitting the pressure of the expanding gas on the piston top to the crankshaft. This conversion from the piston's reciprocating linear motion to the crankshaft's rotational motion enables the engine to output power.