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J. Ocean Eng. Technol. 2010;24(2):47-52.    

Surface Pressure of the Piston Rings in the Diesel Engine of a Ship
Lee Jae-Hwan,Park Byung-Jae
Naval Architecture & Ocean Engineering Chungnam National University,Wing Ship Technology Corporation
선박용 중형 디젤 엔진 피스톤 링의 면압 산출
이재환,박병재
충남대학교 선박해양공학과,윙쉽테크놀러지(주)
© 2010 The Korean Society of Ocean Engineers     Open access / Under a Creative Commons License
Keywords: Diesel engine, Piston ring, Ring surface pressure, Free shape
핵심용어: 디젤 엔진, 피스톤 링, 링 면압, 자유 형상
Abstract
The proper surface pressure on the pistons rings in the diesel engine of a ship is very important, because the pressure controls the oil that is needed to maintain friction at acceptable levels between the pistons and the cylinders. In this paper, basic and theoretical concepts to compute the ring pressure were formulated and applied to obtain the proper surface pressures on selected sample piston rings. During the calculation of the pressure on the piston rings, the computation of the accurate free shape of the piston ring was required. Earlier, Arnold and Prescott introduced theories to compute the free shapes of piston rings, and their approach used rectangular and polar coordinates. In this paper, the free shapes of piston rings using two different theories were computed and compared. The results were quite close, representing the free shape of the piston ring. Ring pressure was computed using the Arnold's free shape that was obtained. A simple GUI was made to compute the surface pressure on the piston rings.


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