Pin;Piston

The main function of the excavator engine piston pin is to connect the piston and the connecting rod, and transfer the force borne by the piston to the connecting rod, and at the same time, make the connecting rod small head drive the piston to move together. In order to reduce the weight, the piston pin is usually made of high quality alloy steel and made hollow.

Piston pin in the excavator engine to withstand the cycle of impact loads, and swing motion, working in poor lubrication conditions in the environment, so it is required to have sufficient strength and stiffness, good surface toughness, good wear resistance, light weight. The basic structure of the piston pin is a thick-walled tubular body, some of them are made into variable cross-section structure according to the strength requirements.

According to the fixed way of the piston pin, can be divided into floating and semi-floating. Floating piston pin in the normal operating temperature of the engine, the piston pin in the piston pin hole and the connecting rod small head set of holes can be free to rotate, suitable for withstanding a large impact load, wear is more uniform, long service life, but the assembly process is more complex. Semi-floating piston pin is a fixed, a floating, mostly used in light high-speed engines, can reduce engine noise and eliminate the possible accidents caused by the ring!