What is the Function of the Crank Connecting Rod Mechanism?

[StValeria]

The function of the crank connecting rod mechanism is to provide a combustion chamber, convert the expansion pressure of the gas generated after fuel combustion acting on the top of the piston into the rotational torque of the crankshaft, and continuously output power. The crank connecting rod mechanism is the main moving mechanism of the engine, whose purpose is to convert the reciprocating motion of the piston into the rotational motion of the crankshaft, while converting the force acting on the piston into the torque output by the crankshaft to drive the rotation of the car's wheels. The crank connecting rod mechanism consists of three parts: the engine block group, the piston connecting rod group, and the crankshaft flywheel group. Among them, the engine block forms the skeleton of the engine and serves as the installation base for various mechanisms and systems of the engine. All major components and accessories of the engine are installed inside and outside the block, which bears various loads.

[DiClayton]

I've worked in repair shops for over a decade, and the main function of the crank-connecting rod mechanism is to convert the up-and-down motion of the pistons in the engine into the rotational motion of the crankshaft, thereby driving the wheels forward. It's like an efficient converter—without it, the power from the pistons would be wasted, and the car simply wouldn't move. I've encountered many problematic cases, such as connecting rod wear causing severe engine vibrations, or even a time when repairing an old Toyota, the bearing oil film failed, leading to abnormal noises, ultimately requiring a major overhaul. To avoid such failures, I recommend car owners regularly change the oil and inspect connection points to ensure proper lubrication. Additionally, pay attention to unusual noises during startup, which can help detect connecting rod deformation or bolt loosening early. Though this small component may seem insignificant, it's crucial for the engine's lifespan and safe driving.