Composite piston pin for internal combustion engine

Abstract

The invention discloses a composite piston pin for an internal combustion engine. The composite piston pin comprises a piston pin matrix and a filling body located in the piston pin matrix. The piston pin matrix is in a cylinder shape, the inner surface of the piston pin matrix is smooth and straight, and the thickness of the piston pin matrix is 10-35 percent of the external diameter of the cylinder of the piston pin matrix. The shape of the outer surface of the filling body is matched with the shape of an inner hole of the piston pin matrix, the filling body is pressed into the piston pin matrix in an extruding mode, and the filling body is in interference fit with the piston pin matrix. Due to the fact that the piston pin is internally provided with the filling body, the piston pin matrix is supported, the strength of the piston pin can be enhanced, bending deformation and ellipse deformation caused during working can be reduced, the local contact stress between the piston pin and the piston pin hole are reduced, abrasion between the piston pin and the pin hole is reduced, and the risk that the piston pin looses the effect is reduced. The thickness of the piston pin steel matrix can be adjusted in a large range on the basis that the rigidity and strength are guaranteed, and the overall weight reducing effect is obvious.

Description

technical field [0001] The invention relates to a composite piston pin for an internal combustion engine. Background technique [0002] In recent years, the engine has been developing towards high power, high load and light weight, and higher requirements have been put forward for the weight, strength and reliability of the piston pin, which requires continuous improvement in structure and materials. innovation and optimization. [0003] The piston pin is located inside the cylinder, and it moves at high speed during operation, and the inertial force is relatively large. Especially for high-speed engines, the reciprocating inertial force can reach more than 3000 times its own weight. Therefore, reducing weight is an important factor to be considered in structural design. In addition, the piston pin transmits load and motion during the working process, and the resulting bending deformation is the main reason for the cracking of the piston pin hole and the failure of the pist...

AI Technical Summary

Problems solved by technology

However, this patent only provides support from the perspective of force, and the effect and effectiveness of the support are not clear. Moreover, adding a reinforcement block in the middle part may cause the middle rigidity to be too large, which will cause a sharp increase in the tensile stress in the transition area on both sides. even crack failure

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