connecting rod is one of the main transmission mechanisms of automobile engines. It connects the piston and the crankshaft, and transmits the pressure of the expanding gas acting on the top of the piston to the crankshaft, so that the reciprocating linear motion of the piston is reversible. Converted to the rotary motion of the crankshaft to output power.

the function of the connecting rod is to transmit the force of the piston to the crankshaft, and to convert the reciprocating motion of the piston into the rotational motion of the crankshaft.

The connecting rod is composed of connecting rod body, connecting rod cover, connecting rod bolt and connecting rod bearing bush. The connecting rod body and connecting rod cover are divided into connecting rod small end, rod body and connecting rod big end.

The small end of the connecting rod is used to install the piston pin to connect the piston. The shaft is usually made into "I" or "H"-shaped section, in order to reduce the mass under the premise of meeting the strength and stiffness requirements.

The big end of the connecting rod is connected with the connecting rod journal of the crankshaft. It is generally made into a separate type, and the half cut from the rod body is called the connecting rod cover, and the two are connected as a whole by connecting rod bolts.

The connecting rod bearing bush is installed in the big end hole seat of the connecting rod, and is assembled with the connecting rod journal on the crankshaft. It is one of the most important matching pairs in the engine. Commonly used anti-friction alloys are mainly white alloys, copper-lead alloys and aluminum-based alloys.

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