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What is the structure of the crank connecting rod mechanism?

2 Answers

DelBella

09/04/25 5:08am

The structural components of the crank connecting rod mechanism include: the engine block group, the piston connecting rod group, and the crankshaft flywheel group. Here is more information about the crank connecting rod: 1. Working principle: It converts the reciprocating motion of the piston into the rotational motion of the crankshaft, while transforming the force acting on the piston into the torque output by the crankshaft to drive the car wheels. 2. Function: It provides a combustion chamber, converts the expansion pressure of the gas generated after fuel combustion acting on the top of the piston into the torque of the crankshaft rotation, and continuously outputs power. 3. Composition: The crank connecting rod mechanism consists of three parts: the engine block group, the piston connecting rod group, and the crankshaft flywheel group.

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ZaneRose

09/16/25 6:08am

I often ponder the structure of the crank-connecting rod mechanism during engine disassembly. It mainly consists of key components such as the crankshaft, connecting rod, and piston. The crankshaft resembles a large shaft with bent arms, fixed at its center to the engine mount. The connecting rod is a slender rod, with its small end linked to the piston pin, tightly connected to the piston, and its big end embracing the connecting rod pin on the crankshaft, cushioned by bearings. The piston moves up and down within the cylinder, propelled by combustion pressure, and the connecting rod transmits this force, converting linear motion into the rotational power of the crankshaft. I've observed many design details, such as aluminum alloy connecting rods to reduce weight and cast iron crankshafts to enhance strength. This mechanism is the core of power conversion in automotive engines. Once damaged—like a bent connecting rod or a broken crankshaft—the engine stops working. Therefore, during maintenance, it's crucial to check for wear and lubrication and avoid excessively high oil temperatures during long-distance drives.

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