• Title/Summary/Keyword: Fuel Lubrication

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An Experimental Study of the Friction and Temperature characteristics of Engine Crankshaft Bearings (엔진 크랭크샤프트 베어링에 대한 마찰 및 온도 특성에 대한 실험적 연구)

  • 조명래;문회지;장인배;한동철
    • Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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    • 1993.12a
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    • pp.57-62
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    • 1993
  • To increase the fuel economy, a reduction of friction loss is important in engines. Experimental investigations have been required for reducing the friction loss of crankshaft bearings. Hydraulic cylinder, and servo control ler system which modified the applied load, and test rig for the observation of the characteristics of engine crankshaft bearings were designed and fabricated. Experiment is performed. Friction torque, journal locus and circumferential temperature variations of crankshaft bearings were measured with appling load, revolution speed, and oil inlet temperature, etc.

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Gasoline engine black sludge - occurrence, causes & testing

  • Lewis, Eric-J.
    • Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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    • 1987.11a
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    • pp.1-27
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    • 1987
  • 1. Gasoline engine sludge is a major worldwide problem 2. U.S. and European sludge have similarities 3. Stop-go driving and longer oil drains make the problem worse 4. Fuel is a major influencing factor 5. Increased use of cracked components may be cause 6. Sludge can be peproduced in controlled field tests 7. Daimler benz M102E and ford PV-2 (VE) tests have been developed to overcome problem by higher oil quality 8. The M102E and PV-2 respond in a similar way to increased dispersancy 9. High dispersant ocp viscosity modifiers appear to have unique adbantage in both tests

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A Study on Friction Reduction Related with the Piston Ring Pack with Thinner Width Ring and Lower Tension Ring (박폭 저장력 피스톤 링 팩에 대한 마찰저감 연구)

  • Chun, Sang-Myung
    • Tribology and Lubricants
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    • v.25 no.5
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    • pp.348-358
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    • 2009
  • To satisfy the more severe emission regulation and the demand of higher fuel economy in near future, the combustion pressure and power output of engines is going to be higher. In order to get the reduction of engine emission and the higher power, it is needed the reduction of the tension and width of ring pack. The lower tension ring and the manufacturing technology of cast iron thinner width ring can bring the friction reduction between the ring and liner during engine running. Therfore, the fuel economy can be achieved. Thereafter the engine emission can be reduced. In this study, by using a developed basic computer program that predicts the inter-ring pressure, the motion of ring and the inter-ring pressure through a crevice volume model between adjacent rings, and the oil film thickness and the friction computed by lubrication theories, it is to be examined the effect of friction reduction from piston ring pack equipped with thinner width ring and lower tension ring.

A Study on Performance Simulation of an Reciprocating Engine for Small Long Endurance Unmanned Aerial Vehicles (소형 장기체공 무인기용 왕복엔진 성능 예측 시뮬레이션 연구)

  • Chang Sung-Ho;Koo Sam-Ok;Shin Younggy
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.29 no.7 s.238
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    • pp.820-827
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    • 2005
  • Development of an engine with good fuel economy is very important for successful implementation of long endurance miniature UAVs (unmanned aerial vehicles). In the study, a 4-stroke glow-plug engine was modified to a gasoline-fueled spark-ignition engine. Engine tests measuring performance and friction losses were conducted to tune a simulation program for performance prediction. It has been found that excessive friction losses are caused by insufficient lubrication at high speeds. The simulation program predicts that engine power and fuel economy get worse with high altitude due to increasing portion of friction losses. The simulation results suggest quantitative guidelines for further development of a practical engine.

A Study on the Performance Characteristics of Low Pressure Hydraulic Circuit of Common Rail System (커먼레일 시스템용 저압 유압회로의 성능특성에 관한 연구)

  • Lee, Choon-Tae
    • Journal of Power System Engineering
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    • v.18 no.6
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    • pp.51-57
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    • 2014
  • High pressure common rail injection technology has revolutionized the diesel industry. Over the last decade it has allowed engine builders to run higher injection pressures as much as above 1,300bar in order to increase engine efficiency, while reducing emissions. This common rail system has low pressure circuit which is consist of low pressure pump, cascade overflow valve and flow metering unit. The low pressure pump's purpose is to feed fuel oil to the high pressure pump. The cascade overflow valve keeps pressure in front of the metering unit constant and provides lubrication for the high pressure pump. The metering unit, known as the MPROP or fuel pressure regulator, regulates the maximum flow rate delivers to the rail. In this paper, we have investigated the performance characteristics of each components and total low pressure circuit of common rail system.

An Experimental Study on Improved Fuel Economy and Lower Exhaust Emissions of New Automotive Engine adopting Split Cooling System

  • Oh, C.S.;Lee, J.H.;Shin, S.Y.;Kim, W.T.
    • Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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    • 2002.10b
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    • pp.407-408
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    • 2002
  • This paper presents a split cooling system for a new inline 4-cylinder automotive engine. The split cooling system circulates coolant to the cylinder head and cylinder block separately. The coolant flow in the cylinder block is controlled by a $2^{nd}$ Thermostat installed at the outlet of cylinder block. The $2^{nd}$ thermostat closes when the coolant temperature is low. And this makes the coolant flow in cylinder block nearly stagnant, thereby reducing the coolant-side heat transfer coefficient and raising cylinder bore temperature. The $2^{nd}$ thermostat starts to open when the coolant temperature reaches a specified temperature. The test results on engine dynamometer show improved fuel economy and lower exhaust emission which result from the decrease in friction works and cooling loss. Also, several vehicle tests, with application of the new engine have been performed. Fuel economy improvement of 0.5{\sim}2.0%$ yields from different test modes and details are discussed in this paper.

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Solid Lubrication Optimization and Structural Design of 17cc Automotive Compressor (17cc급 자동차용 압축기의 고체윤활 최적화 및 구조 설계에 관한 연구)

  • Yang, Yong-Kun;Qin, Zhen;Choi, Yeo-Han;Lyu, Sungki
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.19 no.12
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    • pp.56-61
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    • 2020
  • Fuel economy has always been a major issue in the automobile industry, especially owing to the associated environmental concerns. It is widely known that only 5-20% of the energy generated by automobiles running on internal combustion engine engines is used as power, while the rest is consumed because of friction between components. The main components of the reciprocating piston type compressor used in vehicles, such as the shaft, swash plate, piston, and cylinder, cause severe energy loss owing to frictional contact between each other. The wear contact between the main shaft and the other components is particularly severe. Most quality issues arise owing to the sticking phenomenon that occurs between these parts. In this study, a coating solution to reduce friction is prepared by mixing adhesive solid lubricant, organic binder-polyadimide, inorganic binder (Binder), and graphite in four different ratios, and the best combination is determined.

Change in Physical Properties of Engine oil Contaminated with Diesel (경유 혼입에 의한 엔진오일 물성 변화)

  • Lim, Young-Kwan;Lee, Jong-Eun;Na, Yong-Gyu;Kim, Jong-Ryeol;Ha, Jong-Han
    • Tribology and Lubricants
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    • v.33 no.2
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    • pp.45-51
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    • 2017
  • Engine oil is a substance used for the lubrication of internal combustion systems. However, in some case, defects in engine systems may contaminate engine oil with fuel. Contaminated engine oil can cause problems in the normal functioning of a vehicle. In this study, we investigate the functional properties of engine oil contaminated with diesel fuel. The test results indicate that the engine oil contaminated with diesel fuel has low flash point, pour point, density, kinematic viscosity and cold cranking simulator value. The contaminated engine oil which has low plash point can cause fire and explosion accident. Furthermore, a four ball test indicates that the contaminated engine oil increases wear scar to poor lubricity. Moreover, we investigate the GC pattern using SIMDIST (simulated distillation) for determination of diesel in engine oil. The SIMDIST analytic result, diesel was detected at earlier retention time than engine oil in chromatogram. Thus the SIMDIST method can define whether engine oil is contaminated by diesel fuel or not. We can use the SIMDIST method for the diagnosis of oil condition instead of analyzing other physical properties that require many analytic instruments, large volume of oil sample and long analysis time.

Test and Simulation of An Engine for Long Endurance Miniature UAVs (장기체공 소형 UAV용 엔진 성능시험 및 시뮬레이션)

  • Shin, Young-Gy;Chang, Sung-Ho;Koo, Sam-Ok
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.33 no.5
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    • pp.99-105
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    • 2005
  • Development of an engine with good fuel economy is very important for successful implementation of long endurance miniature UAVs (unmanned aerial vehicles). In the study, a 4-stroke glow-plug engine was modified to a gasoline-fueled spark-ignition engine. Engine tests measuring performance and friction losses were conducted to tune a simulation program for performance prediction. It has been found that excessive friction losses are caused by insufficient lubrication at high speeds. The simulation program predicts that engine power and fuel economy get worse with high altitude due to increasing portion of friction losses. The simulation results suggest quantitative guidelines for further development of a practical engine.

Performance Improvement of Oil Pump by Design of Gerotor (Combined Profile - Two Ellipses) and Port (지로터(2개의 타원 조합) 형상 및 포트 설계를 통한 오일펌프 성능인자 향상)

  • Kwak, Hyo Seo;Li, Sheng Huan;Kim, Chul
    • Journal of the Korean Society for Precision Engineering
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    • v.33 no.3
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    • pp.207-216
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    • 2016
  • A gerotor is suitable for miniature manufacturing because it has high discharge per 1 cycle and a simple structure, while also being widely used for lubrication oil of engines and as a hydraulic source of automatic transmission. In the automobile industry, improvements in fuel efficiency and noise reduction have recently come to the fore. It has also been necessary to continuously improve the flow rate and noise of internal gear pumps for better fuel efficiency through optimal gerotor and port shape design. In this study, to develop an optimal gerotor with a new lobe shape, 2-ellipses-combined, the equation of the lobe shape was derived, and CFD analysis results were compared for 2-ellipses with those of the previous gerotors (3-ellipses and ellipse1-involuteellipse2). A performance test for the oil pump with the optimal rotor (2-ellipses) was carried out and showed good agreement with the results obtained from CFD analysis.