The crankshaft is the main rotating component of the engine. After being connected to the connecting rod, it can convert the up and down (reciprocating) motion of the connecting rod into circular (rotational) motion. It is an important component of the engine, made from carbon structural steel or ductile iron, with two important parts: the main journal and the connecting rod journal (among others). The main journal is mounted on the cylinder block, while the connecting rod journal connects to the big end hole of the connecting rod, and the small end hole of the connecting rod connects to the piston in the cylinder, forming a typical crank-slider mechanism.

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