Abstract
The oil cooling gallery is arranged at the top of the piston, which can effectively reduce the heat load of the piston. In this paper, finite element analysis and fatigue analysis by FE-safe are used to calculate the effects of the different positions of the oil cooling gallery to the temperature, stress field and the fatigue strength of the bowl rim, top land, first ring groove, second land and cooling gallery. The results show that, with the oil cooling gallery moving upward regularly, the temperature of the oil cooling gallery increased, and the temperature of other piston critical position decreased; but when the distance of the oil cooling gallery and combustion chamber decreased, the structural strength of the combustion chamber decreases gradually. In addition, too small distance between the oil cooling gallery and the top surface will make the temperature of the oil cooling gallery too high, which makes the oil coking in the oil cooling gallery, affecting the cooling effect seriously. For this type of piston, the optimal distance between the oil cooling gallery and the top surface is 12.5mm.
Highlights
The working environment for the engine piston is critical, it has to bear the effect of the thermal load during operation [1]
The highest working temperature and the temperature gradient of the critical position in the piston temperature distributions are concerned mostly, the maximum temperature affects the variation of the piston material properties and swelling quantity, and the temperature gradient is the main reason causing the heat distortion and the thermal stress
The purpose of using the cooling gallery is to reduce the temperature of the piston top surface [4] and piston ring groove portion, so that temperature of all critical position in the piston will be controlled in a reasonable limits [5]
Summary
The working environment for the engine piston is critical, it has to bear the effect of the thermal load during operation [1]. The highest working temperature and the temperature gradient of the critical position in the piston temperature distributions are concerned mostly, the maximum temperature affects the variation of the piston material properties and swelling quantity, and the temperature gradient is the main reason causing the heat distortion and the thermal stress. In the design process, it is very certainly necessary to calculate and analyze the piston temperature field, and to take effective measures to reduce the thermal stress in order to increase the ability to withstand the thermal load of the piston. The influence of the location of the oil cooling gallery to the critical position of the piston is obtained, which provides a theoretical basis for the design of the oil cooling gallery
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