Test method for tribological characteristics of high-strength piston ring and cylinder liner in simulated service state

Abstract

The invention aims to provide a test method for simulating tribological characteristics of a high-strength piston ring cylinder sleeve in a service state. The test method comprises a step of determining a relationship between average effective pressure and average combustion chamber pressure, a step of simulating a high strengthening coefficient and a real working condition of a diesel engine if adifference value between the two pressure is within 1%, otherwise, increasing or decreasing the simulated high strengthening coefficient according to the relationship of a linear proportion, a step of determining the sizes of a piston ring sample and a cylinder sleeve sample and measuring a contour molded line of a piston ring to obtain real molded line data, a step of obtaining the curvature radius of the piston ring in the thickness direction through curve fitting, a step of calculating a contact half width of the piston ring sample and the cylinder sleeve sample through a Hertz contact formula to calculate the contact area of the piston ring sample and the cylinder sleeve sample, and a step of obtaining speed curves of the piston ring and a cylinder sleeve under different loads throughcalculation. According to the method, the difference between the actual working condition of the diesel engine and the actual working condition of a testing machine is comprehensively considered, anda comprehensive and scientific research method is provided.

Description

technical field [0001] The invention relates to a test simulation method, in particular to a test simulation method for internal combustion engine cylinder friction pairs. Background technique [0002] At present, people have put forward higher requirements on the performance of diesel engines, which makes diesel engines use high-strength technology to improve their working performance. Diesel engines have the advantages of high work efficiency, high reliability, and good economy, and are widely used in transportation, national defense, agriculture and fishery and other fields. In the next few decades, diesel engines will still become the main power energy equipment for ships and other large mechanical equipment. At present, the enhanced index of marine high-power and high-power-density diesel engines (the product of the average effective pressure Pe and the average piston speed U) has reached 35MPa·m / s, and the newly developed diesel engine is close to 38-40MPa·m / s. With ...

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Problems solved by technology

[0004] However, due to the complexity of the friction and wear mechanism of the cylinder liner-piston ring of the internal combustion engine, the limitations of the simulation experiment are relatively large. In the existing test schemes, the simulation test of the whole machine has poor repeatability and high cost; The test is not easy to control, and there are many interference factors; the component test is easy to cause waste, and the cost is high; the working conditions of the sample test are similar but not very consistent

However, the sample test is easy to control, the cost is low, the repeatability is good, the parameters are easy to control, and the result reproducibility is good, but there is a lack of a test design method to ensure the consistency of the test conditions

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