• Title/Summary/Keyword: Lubricants oil

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The Prototype Development of an Engine Oil Deterioration Sensor Installed Inside an Oil Filter (오일필터 일체형 엔진오일퇴화감지센서 시작품 개발 I)

  • Chun, Sang-Myung
    • Tribology and Lubricants
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    • v.24 no.2
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    • pp.82-89
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    • 2008
  • The purpose of this study is to develop the proto type sensor installed inside an oil filter in order to detect oil deterioration level. The sensor is made up with two concentric cylinders with constant gap in between and a filter element inside the central area. The size will be designed as similar as real oil filters. The sensor will be tested on a test rig, which is circulating engine oil, with the same size of an oil filter adapting housing as real engines'. It will be measured the capacitance of a sample engine oil, then be able to be gotten the dielectric constant. The changes in the dielectric constant could be correlated with the engine oil deterioration level if the sensor development would be completed. In this paper, it will be shown the test results carrying out under variable temperature conditions at atmosphere pressure.

Numerical Analysis on the Oil Film Behavior of Engine Main Bearing Considering Dilution of Diesel Fuel (경유 혼입을 고려한 엔진 메인 베어링의 유막거동에 관한 수치적 연구)

  • Kim, Han-Goo
    • Tribology and Lubricants
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    • v.26 no.4
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    • pp.240-245
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    • 2010
  • This paper describes the influence on engine main bearing behavior of the oil film when the fuel is diluted on a diesel engine equipped with DPF system. Oil film pressure and the thickness is calculated in accordance to the fuel dilution. The calculation is based on the numerical analysis of the engine main bearing. As a result, the engine oil viscosity decreased as the fuel dilution increased. This led the increment of the maximum oil thickness pressure. Verification of the minimum oil film thickness settlement by the engine gas pressure and the fuel dilution was confirmed. Destruction possibility of the engine main bearing was foreseen when the engine speed was 2000 rpm with the fuel dilution 15% and the 5W40 engine oil.

Influence of Lubricating Oil Environments on Behavior of Cavitation Erosion for Alloy Metals of Bearing (베어링 합금재에 대한 캐비테이션 침식 거동에 미치는 윤활제 환경의 영향)

  • 임우조;이진열
    • Tribology and Lubricants
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    • v.9 no.1
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    • pp.55-61
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    • 1993
  • Recently, due to the erosion damage that were generated increasingly at alloy metals of slide bearing by cavity of lubricating oil with tendency of high speed and high output of reciprocating engine, there is a need to study the process on the formation of cavitation erosion, and the characteristic of cavitation erosion at lubricating oil environments under various condition for marine ship. Therefore, the apparatus of cavitation erosion experiment used 20 KHz, $24 \mu m$ piezoelectric vibrator. The main results obtained through this test method are as follows: 1. The max. erosion rate at lubricating oil environments was related to the change of space, oil film thickness, and shown to tendency of gear oil>system oil>turbine oil>mixed oil environments with different viscosity. 2. The pitted hole by cavitation erosion at high viscosity oil environments became small and deep, and in addition to, they appeared to be wide and shallow at low viscosity.

Flow Characteristics of Refrigerant-oil Mixtures in a Dehumidifying Cycle (제습 사이클에서의 냉매-오일 혼합물의 유동특성)

  • 박세민;하삼철;신종민;이장호
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.13 no.1
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    • pp.1-8
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    • 2001
  • This paper deals with refrigerant-oil mixtures in a dehumidifying cycle. Two different oils such as Alkylbenzene(AB) and Polyol-esters(POE) lubricants are used for R134a to investigate the effect of miscibility on oil returnability. It was found that R134a/AB mixture had more unstable interface between oil and refrigerant than R134a/POE mixture. However, overall flow patterns of both refrigerant-oil mixtures were almost same. The minimum height of oil measured in the compressor was as high as twice of the least permissible height of oil in the compressor required to insure its reliability. Thus, it is considered that immiscible oil, i. e., AB for R134a can be used without causing oil returnability problem.

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A Study On the Application of VHVI Base Oil - Hydraulic Fluid for Construction Equipment (VHVI 기유의 제품 적용 기술에 관한 연구 - 건설 중장비용 유압유)

  • 권완섭;문우식;윤한희;김경웅
    • Tribology and Lubricants
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    • v.20 no.1
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    • pp.33-40
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    • 2004
  • This study represents the newly advanced formulation of hydraulic fluids for extended drain interval and introduces the performance results of used oil samples from various excavators. The used oil samples, in this paper, show that there is a sharp change in viscosity drop and moderate additive depletion when viscosity index of hydraulic oil is very high. For the extension of hydraulic fluid life, it is necessary to improve the stability of viscosity and oxidation. New target properties from the used oil analysis were proposed for extended life. Performance of newly developed hydraulic oil based on used oil analysis is compared with previously used one. The properties of new formulation are the viscosity index of 140 and improved thermal stability consists of VHVI base oil. Field test results showed the possibility of extension of fluid life. Additionally, for development of high performance product, new required propertied and performances were discussed.

Water Soluble Type의 Cold Strip Rolling Oil

  • 김주항
    • Tribology and Lubricants
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    • v.5 no.2
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    • pp.21-31
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    • 1989
  • 최근 국내에서도 각종 공작기계 가공의 발전으로 말미암아 이에 쓰여지고 있는 윤활제의 이용범위도 점진적으로 확대되어 가고 있음은 물론 특히 Water계 윤활제의 요구성능은 점점 가혹하게 되어지고 있다. Water계 윤활제라고 하면 일반적으로 Cutting, Grinding, Drawing, Pressing, Heat Treating 등의 공작기계 계통의 Oil을 연상할 수 있겠지만 이들 이외에 각종 유압작동유를 비롯하여 Rolling Oil도 포함되고 있다. 따라서 본 논고에서는 근간 Crose up 되어지고 있는 Water계 윤활제 중 냉각압연유에 대하여 간략하게 기술하여 보고자 한다.

Oil-impregnated Sintered-metal Bearing and Herringbone-grooved Fluid Bearing for High-speed Scanner Motors (함유소결베어링과 빗살무늬 유체베어링의 마찰 특성 및 레이저 스캐너 모터에서의 전기적 특성)

  • 이영제;정광섭;정성훈
    • Tribology and Lubricants
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    • v.15 no.1
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    • pp.108-115
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    • 1999
  • The electrical and frictional properties of oil-impregnated sintered-metal bearing (OSB) and herringbone-grooved fluid bearing (HFB) with varying loads and speeds were measured. OSB shows very good performance up to 20,000 rpm and 0.05 N, and HFB successfully works up to 35,000 rpm and 0.05 N. From the endurance tests on start-stop and continuous operation, it was confirmed that those bearings could be mass-produced fur use on scanner motor in a laser scanner unit.

Finite Element Analysis of Contact Pressure Behavior in Compression Ring-Oil Film (압축링-유막간의 접촉압력 거동에 관한 유한요소해석)

  • 김청균;김한구;한동철
    • Tribology and Lubricants
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    • v.11 no.4
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    • pp.53-57
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    • 1995
  • The contact pressure behavior is examined by means of a finite element analysis. The oil film between the piston ring and cylinder liner is analyzed on the basis that it behaves like a polymer material. The calculated results indicate that a shape of sloping edge with a straight line, which is designated as a Model III, shows a good performance on the contact pressure behavior for the increased speed. Obviously, the ring face profiles play an important role on the contact pressure between compression ring and oil film.

Wear Properties of Vegetable Oils Formulated with Some Antiwear Additives (내마모첨가제가 첨가된 식물성유의 마모특성연구)

  • 최웅수;안병길;정용진;권오관
    • Tribology and Lubricants
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    • v.12 no.3
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    • pp.6-11
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    • 1996
  • There has been a growing concern for the use of mineral oil based lubricants because of the worldwide interest in environmental issues. This has prompted the use of vegetable oils as more environmentally acceptable base fluids. In view of this, four-ball wear test was carried out to investigate the tribological behavior of selected vegetable oils blended with ZDDP, TCP and DBP under high speed and temperate conditions. Of the additive evaluated, the new additive, DBP has provided antiwear performance superior to the two other additives more commonly used. This superior performance by DBP is probably caused by different wear mechanism. This wear mechanism has been evidenced by the surface analysis of worn balls conducted using optical microscope and EDAX.

A Study of the Friction Characteristics of Plastics on Lubricated Condition (윤활상태에서 플라스틱의 마찰특성에 관한 연구)

  • 강석춘
    • Tribology and Lubricants
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    • v.8 no.1
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    • pp.48-55
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    • 1992
  • The friction characteristic of plastics (PTFE, Nylon, Acetal and phenolic) was studied on the lubricated condition with a pin on disk machine. Mineral oil without additive (base oil) and water were used as liquid lubricants at the controlled temperature. From the experimental work, it was found out that the coefficient of friction of plastics was controlled by the mechanical properities of plastic more than that of liquid for various load and temperature. Viscosity of liquid has affected on the friction only at low temperature under lighb load. Among the tested plastics, the coefficient of friction of PTFE was the lowest under light load and at low temperature while Nylon at medium load and temperature, and Acetal at heavy load and high temperature. The coefficient of friction of soft plastics like PTFE and Nylon were increased as the load and temperature were increased, while that of hard plastic (Acetal) was decreased and that of thermo setting plastic (phenolic) was mixed. Also for soft plastics, the coefficient of friction under heavy load was always higher than that under light load, while hard plastic was vice versa.