Improved diesel engine piston

Abstract

The invention discloses an improved piston of a diesel engine, which comprises a piston head and a piston skirt. The vertical molded line of the piston head is a staircase curve while the vertical molded line of the piston skirt is also a staircase curve. The invention has the advantages that the piston is regularly distorted when being operated in the diesel engine and according to the distortion, the molded line structures of the piston head and the piston skirt are improved so as to ensure that such failures as napping, burning, etc. are not easy to occur on the sliding surfaces of the piston head and the piston skirt; in different operating modes, from cold starting to full load even in the overloading operation, the piston of the diesel engine can maintain the optimum clearance with a cylinder, thus effectively avoiding the occurrences of problems, such as piston knocking, cylinder seizing, etc.

Description

technical field [0001] The invention relates to a diesel engine, in particular to a piston whose profile is improved to improve its reliability and durability. Background technique [0002] The piston of a diesel engine reciprocates in the cylinder, which is one of the parts with the most severe working conditions in the piston engine. The working reliability and durability of the diesel engine are largely related to the working conditions of the piston. [0003] figure 1 It is a structural schematic diagram of an existing diesel engine piston, the longitudinal profile 1 of the piston head and the longitudinal profile 3 of the piston skirt are straight lines, figure 2 The horizontal axis X in the center represents the axis of the piston pin, and the vertical axis Y represents the cross-sectional profile of the piston skirt. The existing piston skirt profile 7 is a circular curve. The piston designed with this structure, when the piston starts to work , Due to the low temp...

AI Technical Summary

Problems solved by technology

[0003] figure 1 It is a structural schematic diagram of an existing diesel engine piston, the longitudinal profile 1 of the piston head and the longitudinal profile 3 of the piston skirt are straight lines, figure 2 The horizontal axis X in the center represents the axis of the piston pin, and the vertical axis Y represents the cross-sectional profile of the piston skirt. The existing piston skirt profile 7 is a circular curve. The piston designed with this structure, when the piston starts to work , due to the low temperature, the piston and the cylinder will knock on the cylinder due to the excessive gap. When the working temperature of the piston rises, due to thermal expansion, the gap between the piston and the cylinder becomes smaller, and it is easy to be bitten in the cylinder.

In addition, when the piston is running at high temperature and under high mechanical load at high speed, poor lubrication, etc., it is easy to generate large wear and tear, resulting in roughening of the sliding surface, burns and other failures, so it is easy to deform

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