Cummins Engine Part Piston Pin 4095504 For Cummins QSK23 Engine

Function and working conditions of piston pin

The piston pin is used to connect the piston and the connecting rod, and transfer the force of the piston to the connecting rod or vice versa.

The piston pin bears a great periodic impact load under high temperature conditions, and because the piston pin swings at a small angle in the pin hole, it is difficult to form a lubricating oil film, so the lubrication conditions are poor. For this reason, the piston pin must have sufficient rigidity, strength and wear resistance. The quality is as small as possible, and the pin and the pin hole should have a proper fit clearance and good surface quality. Under normal circumstances, the stiffness of the piston pin is particularly important. If the piston pin is bent and deformed, the piston pin seat may be damaged.

In short, the working conditions of the piston pin are that the bearing pressure ratio is large, the oil film cannot be formed, and the deformation is not coordinated. Therefore, its design requires sufficiently high mechanical strength and wear resistance, as well as high fatigue strength.