The connecting rod of the compressor transforms the rotational motion of the crankshaft into the reciprocating motion of the piston and transmits power to the piston to do work on the gas. When the compressor is operating, the piston moves up and down in the cylinder. The connecting rod connects the piston and the crankshaft. The motion of the piston is transmitted to the crankshaft through the connecting rod, causing the crankshaft to generate rotational power. Generally, quenched and tempered steels such as 45 steel, 40Cr, or 40MnB are used, which have good comprehensive mechanical properties. New materials include Germany's C70S6 high - carbon micro - alloyed non - quenched and tempered steel, Splitasco series forged steel, Fractim forged steel, and S53CV - FS forged steel. These materials have higher hardness and can improve the strength and fatigue resistance of the connecting rod. The connecting rod bears alternating loads during operation. After long - term use, fatigue cracks may occur in high - stress areas, eventually leading to fracture, such as in the connecting rod body, connecting rod bolts, etc. If the stiffness of the connecting rod is insufficient, it may bend or the big end may become out - of - round under large forces, affecting the normal operation of the compressor and causing uneven wear of the piston, cylinder, bearing, and crankpin. The mating surfaces between the small end of the connecting rod and the piston pin, and between the big end of the connecting rod and the crankshaft may experience wear during long - term relative motion, reducing the mating accuracy and affecting the performance of the compressor.
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