The piston pin is a cylindrical pin mounted on the piston skirt, and its center passes through the connecting rod tip, which connects the piston and the connecting rod and transmits the force of the piston to the connecting rod. Generally made of high quality alloy steel, and made hollow.
General domestic use of the piston pin hole will have a step or groove, there is a solid piston pin
The piston pin used abroad is straight
The piston pin is used to connect the piston and the connecting rod and pass the force of the piston to the connecting rod or vice versa. Piston pin under high temperature conditions to withstand a large cyclical impact load, and because the piston pin in the pin hole swing angle is not large, it is difficult to form a lubricating oil film, so poor lubrication conditions. For this piston pin must have sufficient rigidity, strength and wear resistance, the quality is as small as possible, the pin and pin hole should have the appropriate fit gap and good surface quality. In general, the stiffness of the piston pin is particularly important, if the piston pin bending deformation, the piston pin may damage. Piston pin material is generally low carbon steel or low carbon alloy steel, such as 20,20Mn, 15Cr, 20Cr or 20MnV and so on. The outer surface carburizing hardened, and then by grinding and polishing and other finishing. This not only improves the surface hardness and wear resistance, but also to ensure a higher strength and impact toughness.
The structure of the piston pin is very simple, basically a thick wall hollow cylinder. The shape of the hole is cylindrical, two sections of the cone and the combination of shape. The cylindrical hole is easy to handle, but the mass of the piston pin is large. The piston pin of the two sections of the tapered hole has a small mass and the bending moment of the piston pin is the largest in the middle of the piston pin, so close to the equal strength beam Hole processing is more difficult.