The main parts of the engine, after being equipped with a connecting rod, can undertake the up and down (reciprocating) motion of the connecting rod to become a cyclic (rotating) motion. It is an important component on the engine, made of carbon structural steel or ductile iron, with two important parts: the main journal, connecting rod journal, and others. The main shaft neck is installed on the cylinder block, and the connecting rod neck is connected to the connecting rod big end hole, while the connecting rod small end hole is connected to the cylinder piston, which is a typical crank slider mechanism. The lubrication of the crankshaft mainly refers to the lubrication of the connecting rod big end bearing shell and the crankshaft connecting rod neck, as well as the lubrication of the two fixed points The rotation of the crankshaft is the power source of the engine. It is also the source of power for the entire mechanical system.
