[논문]내연기관 윤활시스템의 설계검증

전상명

doi:10.9725/kstle.2010.26.3.175

내연기관 윤활시스템의 설계검증
The Design Review for Lubrication System of an Internal Combustion Engine 원문보기

윤활학회지 = Journal of the Korean Society of Tribologists and Lubrication Engineers, v.26 no.3, 2010년, pp.175 - 183

초록
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초기 엔진 개발 단계에서 양질의 엔진 개념 설계를 얻기 위해 가장 중요하게 다루는 분야가 엔진윤활시스템 설계라는 것은 지나친 말이 아니다. 그러므로 초기 개념설계 후 엔진제작에 앞서 초기 설계된 윤활시스템과 그 관련 부품에 대한 시스템 윤활해석을 수행하는 것은 필수적이다. 따라서, 본 논문에서는 초기 개념 설계된 2.0 L DOHC엔진에 대한 엔진 베어링과 윤활시스템에 대하여 수치해석적으로 유로망 해석을 하여 설계검증을 한 결과를 기술하고자 한다.

Abstract ▼ AI-Helper

It is not too much to say that, at the beginning of engine development, the most important areas for a good engine concept design is the lubrication system design. So, between right after finishing concept design and before procuring the engine, it is necessary to carry out the system lubrication analysis for the initially designed lubrication system and the related lubricating parts. Therefore, in this paper, it is to describe the results of a design review carried out the numerical net work analysis on the engine bearings and the lubrication system of an initially designed 2.0 L DOHC engine.

주제어

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가설 설정

a) The diameter of a rear vertical oil gallery at cylinder head is supposed to change from 5 mm to 7 mm.
a) The initially designed clearance (0.052~ 0.096 mm) of main bearings is acceptable. However, that (0.
b) To find places required more pressure inside the flow network.
e) With new and current oil pump, the suction speeds at every rpm are reasonable to most of engine speeds as comparing to the recommended speed. The centrifugal resistant pressure dose not prevents the inlet oil at the entrance of crankshaft oil bore.

제안 방법

In this paper, two oil pump’s performance curves are used for the evaluation of the initially designed lubrication system.
The whole network is divided into several small networks, for examples, the bearing group 1 to 4 for each set composed of a main bearing, a bigend bearing and a oil jet, the bearing group 5 for rear main bearing only, the hydraulic tappet group 1 and 2 for each intake side and exhaust side, and the cam bearing group 1 and 2 for each intake side and exhaust side. The involved subprograms are of the calculation of basic equations for pipe flow, oil pump flow, oil filter flow, bearing flow including bearing load, effective temperature, eccentricity and power loss calculation with pressure data of combustion chamber, centrifugal pressure of rotating parts, oil jet flow, hydraulic tappet flow, and the expression of density and viscosity depending on temperature. During calculation, a certain assumed flow rate for each group is forced to converge by iteration.

대상 데이터

The engine involved for this study is a 4 cylinder 2.0 L DOHC gasoline engine with the expected combustion pressure distributions as shown on Fig. 1.

이론/모형

First, to carry out the numerical analysis of engine bearings, a computer program developed by Chun[11] based on the lubrication theory of dynamically loaded journal bearings, is used. Then, to perform the analysis of engine lubrication system, another computer program also developed by Chun[9,10] based on the theory of flow network analysis together with bearing lubrication theory, is used.
In this paper, the general flow network theory and the flow characteristics of each lubricated component are used as proposed by Chun[9,10]. The flow characteristics are systematically structured in order to analytically simulate the flow network of engine lubrication system.
First, to carry out the numerical analysis of engine bearings, a computer program developed by Chun[11] based on the lubrication theory of dynamically loaded journal bearings, is used. Then, to perform the analysis of engine lubrication system, another computer program also developed by Chun[9,10] based on the theory of flow network analysis together with bearing lubrication theory, is used. The programs had already verified as using them for other engine development projects [9,10].

참고문헌 (11)

Lo, R. S., "Digital Simulation of Engine Lubrication Systems," SAE 710205, 1971.
Heubner, K. H., "A Simplified Approach to Flow Network Analysis: Application to Engine Lubrication Systems," SAE 750080, 1975.
Ricardo Consulting Engineers, Lubricating Oil Systems for Automotive Engines, Design Proposal - DP76/155, March 1976.
Neu, E. A., Wade, J. A., and Chu, A. C., "Simulating the Lubrication System of a Diesel Engine," SAE 770032, 1977.
Kluck, C. E., Olsen, P. W., and Skriba, S. W., "Lubrication System Design Considerations for Heavy-Duty Diesel Engines," SAE 861224, 1986.
Tran, P., Yamamoto, T., Baba, Y., and Hoshi, M., " An Analysis of Lubricating System of Automobile Gasoline Engine," SAE 871659, 1987.
Hass, A., Esch, T., Fahl, E., Kreuter, P., and Pischinger, F., "Optimized Design of the Lubrication System of Modern Combustion Engines," SAE 912407, 1991.
Mian, M. A., "Design and Analysis of Engine Lubrication System," SAE 970637, pp. 219-232, 1997.
Chun, S. M., "Network Analysis of an Engine Lubrication System," Tribology International, Vol. 36, No.8, pp. 607-617, 2003.
M. Chun, Y. W. Park, and S. Jang, "A Study on Effects of Oil Aeration Level on Engine Lubrication System by Using Computer Program," J. of The KSTLE, Vol. 17, No. 3, pp. 198-208, 2001.
Chun, S. M., "The calculation of Engine Bearing Journal Orbit Using Mobility Method," Automotive Technology and News, Daewoo Motor Co., Ltd., Vol. 34, No. 3, pp. 4-15, 1991.

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내연기관 윤활시스템의 설계검증
The Design Review for Lubrication System of an Internal Combustion Engine 원문보기

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내연기관 윤활시스템의 설계검증 The Design Review for Lubrication System of an Internal Combustion Engine 원문보기

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내연기관 윤활시스템의 설계검증
The Design Review for Lubrication System of an Internal Combustion Engine 원문보기

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