Go to the main menu
Skip to content
Go to bottom
REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of the Korean Society of Tribologists and Lubrication Engineers
Journal Basic Information
Journal DOI :
The Korean Society of Tribologists and Lubrication Engineers
Editor in Chief :
Volume & Issues
Volume 27, Issue 6 - Dec 2011
Volume 27, Issue 5 - Oct 2011
Volume 27, Issue 4 - Aug 2011
Volume 27, Issue 3 - Jun 2011
Volume 27, Issue 2 - Apr 2011
Volume 27, Issue 1 - Feb 2011
Selecting the target year
Theoretical Analyses of Herringbone Grooved Air Thrust Bearings
Park, Sang-Shin ; Jang, Woo-Young ;
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 27, issue 5, 2011, Pages 233~239
DOI : 10.9725/kstle.2011.27.5.233
In this study, the characteristics of herringbone grooved air thrust berings are studied. It is shown that a generalized coordinate transformation method which was developed for handling complex geometry such as herring bone groove journal bearings is well applied to herringbone grooved air thrust bearings. The load carrying capacity and stiffness and damping coefficients are calculated according to the design parameters like groove depth or the number of grooves and compared to that of plain air journal bearings.
Performance Analysis of Mechanical Face Seal Used for Primary Heat Transport Pump in Heavy Water Reactor
Kim, Jeong-Hun ; Kim, Dong-Wook ; Kim, Kyung-Woong ;
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 27, issue 5, 2011, Pages 240~248
DOI : 10.9725/kstle.2011.27.5.240
Mechanical face seal installed in primary heat transport pump used for heavy water reactor prevents leakage of working fluid using thin working fluid film between primary seal ring and mating ring. If the leakage of working fluid exceeds the allowable volume, serious accident can be happened by the trouble of primary heat transport pump. The thinner fluid film exists between primary seal ring and mating ring, the less working fluid leaks out. On the other hand, if the thickness of fluid film is not enough, the life of mechanical face seal will be reduced by friction and wear. Therefore appropriate design is necessary to maximize the performance and life of mechanical face seal. In this study, numerical analysis using finite volume method was conducted to investigate the performance of mechanical face seals which have same deep straight groove and 11 different net coning values. As results, equilibrium clearance between primary seal ring and mating ring, leakage volume of working fluid, friction torque on sealing surface and stiffness of working fluid film were obtained. With increasing net coning value, equilibrium clearance and leakage volume increase, and friction torque and stiffness of fluid film decrease.
The Effect of Wear on the SAW Motor Driving Characteristics
Moon, Bong-Ho ;
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 27, issue 5, 2011, Pages 249~255
DOI : 10.9725/kstle.2011.27.5.249
Recently the demand for a fast and precise actuator in semiconductor industries is growing larger. A SAW motor is now expected as a new friction-drive actuator to meet such demand. However, its friction and wear properties are almost unknown and its low stability and reliability still remain to be solved. In this research the tests of SAW motor were carried out and its durability was discussed. The effect of wear caused by friction on the driving force and driving speed were clarified.
Effect of Roundness Error of a Crank Pin Bearing for a Marine Engine on the Minimum Film Thickness
Ha, Yang-Hyup ; Shin, In-Dong ; Lee, Sang-Min ; Lee, Seung-Jun ; Lee, Deug-Woo ;
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 27, issue 5, 2011, Pages 256~263
DOI : 10.9725/kstle.2011.27.5.256
Bearings of marine engines are operated under severe conditions because of dynamic load and low sliding speed. This paper deals with lubrication analysis of a crank pin bearing for a marine diesel engine. Journal center locus and oil film thickness are compared of crank pin bearing. In the past researches, journal bearings have been studied only about the surface of bearing. In addition to this conventional research, this paper analyzes the effect of roundness error of a journal and a bearing on the minimum film thickness. Numerical analysis has been studied by using Reynolds equation and also Half-Sommerfeld condition is applied as boundary condition. Futhermore, this study investigates the effect of roundness error change on the minimum film thickness. The results demonstrate that the bigger amplitude of roundness error yields, the lower minimum oil film thickness is. In comparison to previous research considered a journal and a bearing individually, the results considering a journal and a bearing together show that amplitude of roundness error of journal has very little effect on the minimum oil film thickness.
Friction Characteristics of CNx Coated Dimple Pattern with Hexagonal Array
Choi, Won-Sik ; Umehara, Noritsugu ;
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 27, issue 5, 2011, Pages 264~268
DOI : 10.9725/kstle.2011.27.5.264
In this study, we examined the friction characteristics of a dimple pattern on a carbon nitride coating. The study was conducted with a hexagonal array 40
dimple pattern on a steel bearing containing a CNx coating. The area density of the dimple patterns were varied between 5% and 25%, the speed was varied from 0.06-0.26 m/s, and the load was varied between 20-100N. In general, we found that as the velocity increased, the friction coefficient increased. Furthermore, the friction coefficient was lowest at a load of 40N. The friction coefficient of the non-coated specimen was 0.025-0.15; on the other hand, the friction coefficient of the coated specimen was 0.002-0.02. Thus, we determined that the coated materials could reduce the friction coefficient by a factor of 7.5.
Failure Study for Tribological Characteristics Including with Pad, Lining and Hub disk in Vehicle Brake System
Lee, Il-Kwon ; Kim, Chung-Kyun ; Cho, Seung-Hyun ;
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 27, issue 5, 2011, Pages 269~274
DOI : 10.9725/kstle.2011.27.5.269
The purpose of this paper is to study and analyze the improvement method for the failure examples including the vehicle brake system in actual field. It was verified that the indicator plate of pad wear scratched the brake disk because of wearing after displacement of non- identification parts pad. The caliper of other vehicle was installed with brake system verified the phenomenon produced groove in center point because of one side wear when the pad was not fully contacted with the rub disk by other action surface pressure and pad action condition. It verified that the crack phenomenon fatigue was produced by brake thermal deformation because of decreasing the thickness by grinding to modify the non-uniformed wear of brake disk. It verified that the friction sound was produced by the friction phenomenon because of non-uniformed contact of lining and an alien substance with inner of the drum and lining braking by crack phenomenon with brake drum surface.
Performance of Automotive Wheel Bearing Grease by Water Contents
Lim, Young-Kwan ; Lee, Eun-Hee ; Lee, Joung-Min ; Jeong, Choong-Sub ;
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 27, issue 5, 2011, Pages 275~280
DOI : 10.9725/kstle.2011.27.5.275
Automotive wheel bearing grease helps to reduce stresses and prevent wear of wheel bearings. But it is easily contaminated by water and other contaminants. In this study, we investigated the property change of automotive wheel bearing grease under water contamination. The result showed that some properties such as dropping point, work penetration and oxidation stability were not influenced by water content. However, most of properties such as work stability, water washout characteristics, leakage tendency, oil separation, evaporation loss and rust protection became worse after water was added. This is thought that added water makes the interaction weak between thickener and base oil of grease.