機(jī)械外文翻譯--發(fā)動(dòng)機(jī)拉缸問(wèn)題探討(參考版)
2025-05-17 00:03本頁(yè)面
【正文】 附件 2：外文原文 Discussion on the engine cylinder scoring Abstract this paper pullcylinder engine mechanism, analyze the reasons for the engine cylinder scoring and proposed measures to prevent the pull cylinder. Key words pullcylinder engine of preventive measures In the course of the engine is often encountered in the engine cylinder scoring phenomenon, the socalled pullcylinder, that is, engine piston rings or piston and cylinder liner surface of the work injury, nap, pull into the groove phenomenon. Pull cylinder considerable harm, pull the cylinder when the cylinder liner wear rate is high, up to several hundred times the normal, so that the piston, piston ring and cylinder liner greatly reduced life expectancy, so that the piston and cylinder liner bite, resulting in engine damage. Therefore, the master cylinder pull forming mechanism, carefully analyze the reasons for pulling cylinder to study the preventive measures to avoid pullcylinder produces an important guiding significance for 1 The mechanism of the formation of a pullcylinder Pull cylinder mechanism, intuitively, this means between piston or piston ring and cylinder liner locally generated heat to produce hightemperature melting ring and cylinder liner erosion adhesion between the piston and cylinder liner oil film disruption is to generate the main reason for pulling cylinder , oil film between the piston and cylinder liner, once interrupted, then the two metals to produce dry friction, highspeed relative motion due to the heat generated will exceed the melting point of metal, causing piston, piston ring and cylinder liner erosion surface of the melt adhesion, Pistons continue to exercise, the two adhesion points of the surface ablation was snapped, resulting in cylinder scoring. 2 cylinder causing the engine pulling the reasons for Overload New machinery or just overhaul the mechanical factory there a reasonable runin period, runningin period and can operate at full speed, speed should not exceed 80% of the speed calibration, since the runin period, the mating surface of the most favorable working surface and lubricant film has not yet formed at this stage of large load of work, it will cause overheating and partial melting hightemperature corrosion resulting adhesion, the formation of pullcylinder. The gap with the piston and cylinder is too small From the sealing point of view, the piston and cylinder with the gap as small as possible, but if too small, engine work, the resulting heat to the piston, piston rings, cylinder liner thermal expansion. As the piston expansion coefficient than the piston ring, cylinder liner expansion coefficient, therefore, than the expansion of the piston cylinder after heat expansion of volume, which would undermine the oil film between the piston and cylinder liner, resulting in cylinder scoring. engine temperature is too high As the engine temperature is too high, so that excessive expansion of the piston to eliminate with the gap, resulting in cylinder scoring. Causing the engine temperature is too high main reasons are: (1) cooling system leaks, water shortages Cylinder Head Gasket water crossings washed out or highlight the amount of wet cylinder liner does not meet the requirements, as well as wetaging or damaged cylinder seal ring will result in leakage of cooling water. Radiator has been corrosion or damage, aging of the pipe break something, plumbing joints loose, water pu
畢業(yè)設(shè)計(jì)相關(guān)推薦
鄂ICP備17016276號(hào)-1