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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Society of Tribologists and Lubrication Engineers
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Journal DOI :
The Korean Society of Tribologists and Lubrication Engineers
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Volume & Issues
Volume 10, Issue 4 - Dec 1994
Volume 10, Issue 3 - Sep 1994
Volume 10, Issue 2 - Jun 1994
Volume 10, Issue 1 - Mar 1994
Selecting the target year
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 10, issue 1, 1994, Pages 1~9
합성기재 그리이스의 특성
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 10, issue 1, 1994, Pages 10~13
A Study, on the Minimum Oil Film Thickness of Connecting-rod Bearing in Engine
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 10, issue 1, 1994, Pages 14~26
The minimum oil film thickness(MOFT) in the connecting-rod bearing of a 1.5 liter, L-4, gasoline engine is measured up to 5500 rpm and calculated to study the dynamically loaded engine bearing. Short bearing approximation and Mobility method are used for theoretical analysis of oil film characteristics. And cylinder pressure, crank-pin surface temperature and bearing temperature are measured as the input data of theoretical analysis. The MOFT are measured by the total capacitance method(TCM). To improve the reliability of the test results, a reasonable determination method of bearing clearance is introduced and used, and the effects of cavitation and aeration on the test results are neglected. The crankshaft is grounded by means of a slip ring. A scissor type linkage system was developed to measure the MOFT and bearing temperature. The effects of engine speed, load and oil viscosity on the measured and calculated minimum oil film thicknesses are investigated at 1500 to 5500 rpm. From the comparison between the measured and calculated MOFT, it is found that a qualitative similarity exists between them, but in all cases, the measured MOFT are smaller than those calculated.
A Study on the Load Characteristics of Air-Lubricated Hydrodynamic Herringbone-Grooved Journal Bearing
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 10, issue 1, 1994, Pages 27~34
An analysis based on the narrow groove theory is not suitable for the case of insufficient number of grooves or of non-rectangular shaped grooves. In this study, we present the solution of the compressible Reynolds equation for the air-lubricated hydrodynamic herringbonegrooved journal bearing with circular shaped grooves. From the results calculated numerically, optimal design values are obtained for the herringbone-grooved journal bearing.
A study on the Static and Dynamic Characteristics of Tilting Pad Thrust Bearing by Approximate Elasto-Thermohydrodynamic Lubrication Analysis
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 10, issue 1, 1994, Pages 35~45
The thermohydrodynamic analysis of tilting pad thrust bearing is studied with the consideration of elastic effect of pad. Reynolds equation, deflection equation and energy equation are solved simultaneously with the boundary conditions. Reynolds equation is modified as the approximate form. Pads are supported by the line pivot and the point pivot respectively. Pads are considered as the flat planes. Effects of pad thickness on the performance of thrust bearing are emphasized and the performances of rigid pad and elastic pad are compared. Effects of inlet temperature on performances of the bearing are compared. Dynamic characteristics of both pad supported by line and point pivot are compared.
A Study on the Static and Dynamic Characteristics of Air Lubricated Titing Pad Journal Bearing with Direct
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 10, issue 1, 1994, Pages 46~55
The static and dynamic analysis of air lubricatied tilting pad journal bearing which considers tilting effect of each pad, preload but which neglects pad inertia effect and deflection are performed. A direct numerical method is used in evaluating the static characteristics such as load carrying capacity, friction force and small peturbation method is used for calculation of dynamic characteristics. Stiffness and damping coefficients are compared with the variation of the preload. And these coefficients are slightly decreased with increased compressibility number under the constant bearing load carrying capacity.
Analysis of the Conical Air Bearings with two Circumferential Grooves
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 10, issue 1, 1994, Pages 56~61
The conical bearing can be used to support the radial and thrust load simultaneously. Two circumferential grooves with discrete hole restrictions are made on the bearing surface in order to increase stiffness. In this paper, the dynamic characteristics of this type of bearings are calculated such as stiffness and damping coefficients. As a results of theoretical analysis, it is verified that there exist the groove depth and distance between two grooves which produce the maximum stiffness at the given bearing dimensions.
Analysis of Statically Indeterminate Bearing-Shaft System Prediction of the Behavior of Ball Bearing
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 10, issue 1, 1994, Pages 62~68
The analysis of statically indeterminate bearing-shaft system was investigated. The moment loads and misalignment angles which were induced in the ball bearings were determined, and the influence of span length of this system on the moment loads and fatigue lives was identified. The sliding and spinning speeds between balls and raceways which affected the performance of ball bearing evaluated. The equation to estimate the cage speed of ball bearing under moment loads was proposed. This equation had been verified by the test results of measuring of cage speed, which was useful to the prediction of ball bearing under moment loads.
Theoretical Analysis of Lubrication for the Hermetic Scroll Compressor with Back-Pressure Chamber
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 10, issue 1, 1994, Pages 69~77
Oil flow pass of hermetic scroll compressor with back pressure chamber was described. Dynamic analysis was preceded in order to obtain the loads on the lubricating contacts. The mobility method of dynamically loaded journal bearings was applied to the crank jornal bearing and lower main bearing, and they could be designed to operate under fluid film lubrication. From the consideration of their film thicknesses and oil flow rates, optimal bearing clearances or other bearing dimensions could be assessed. The major friction loss was calculated to be from the axial force between the two scrolls. Therefore, it was suggested that the designers should be careful to reduce the over-turning moment on the orbiting scroll.
A Study of Chemical and Mechanical Properties of the Mineral and Synthetic Oil Added with Two Different Zn-DTPs
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 10, issue 1, 1994, Pages 78~88
For the study of chemical and mechanical properties of the synthetic and mineral oil added with two different Zn-DTPs, base and formulated oils were analyzed and compared. Kinematic viscosity and total acid number (TAN) were tested at high temperature for formulated oils. Also the oils added with different alkyl groups of Zn-DTP were tested for thermal stability and TAN changes. The 4-ball machine was used to test for the mechanical properties, such as the coefficient of friction and wear. The worn areas after sliding test were analyzed with microscope and EDX, too. From the study, mineral and synthetic oil have different effects according to the various added ratio of the primary and secondary alkyl groups of Zn-DTP. Also the temperature of test oil affected the anti-wear and friction property of the formulated oils. For synthetic oil, the primery alkyl group of Zn-DTP made better friction properties than that of secondary, while, for mineral oil, secondary alkyt group was better only at low temperature for mineral oil.