The piston pin of Jichai diesel generator is mainly used to connect the piston and connecting rod, bear the reciprocating inertia force and gas pressure when the piston moves, and transmit them to the connecting rod. The middle part of the piston pin of JICHAI diesel generator passes through the small end hole of the connecting rod, and the two ends are supported in the piston pin seat hole.
Jichai diesel generator piston pin is subject to great periodic impact load under high temperature. The relative sliding speed between the cylindrical surface of the piston pin and the small end bushing of the connecting rod of JICHAI diesel generator is not high, but the general lubrication condition is poor, and most of them are splash lubrication. Therefore, the piston pin of Jichai diesel generator is required to have sufficient strength and stiffness, wear resistance on the surface, good toughness and high fatigue strength inside. In order to reduce the reciprocating inertial force, the piston pin of JICHAI diesel generator should be light in weight.
Jichai diesel generator piston pin is usually made of high-quality steel (No. 20 steel) or alloy steel. Its outer surface shall be subject to carburizing or chlorination treatment, and then finely ground to achieve high surface roughness and precision. In order to improve its fatigue strength, the internal and external surfaces of the piston pin of Jichai diesel generator can be carburized and quenched at the same time.
The piston pin of Jichai diesel generator is generally made into a hollow cylinder to make it light in weight and reduce its strength and stiffness less.
The piston pin of JICHAI diesel generator is usually installed in full floating mode. The so-called full floating type means that the piston pin of JICHAI diesel generator can rotate freely in the small end of the connecting rod and the piston pin seat when the engine is working. The structure is simple. The slow rotation of the generator piston pin is conducive to the distribution of the splashed lubricating oil on the friction surface, reducing the wear. The wear along the length and circumference of the piston pin of the diesel generator in Jichai can be relatively uniform. In order to prevent the cylinder wall from being damaged by the axial displacement of the piston pin of JICHAI diesel generator, piston pin snap rings are installed at both ends of the piston pin of JICHAI diesel generator, and the snap rings should be installed in the groove of the piston pin seat hole of JICHAI diesel generator.
Due to the large expansion coefficient of aluminum piston, in order to ensure the proper clearance between the piston pin and the pin seat hole of JICHAI diesel generator during operation, there is a certain interference between them at room temperature. In order to facilitate installation and not damage the fitting surface, the piston is usually put into water or oil to heat to a fixed temperature (about 70~90 ℃), and then the piston pin of JICHAI diesel generator is pushed into the seat hole.
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