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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
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Volume & Issues
Volume 29, Issue 6 - Dec 2013
Volume 29, Issue 5 - Oct 2013
Volume 29, Issue 4 - Aug 2013
Volume 29, Issue 3 - Jun 2013
Volume 29, Issue 2 - Apr 2013
Volume 29, Issue 1 - Feb 2013
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Development of a Dipstick Gage Type Small Engine oil Deterioration Detection Sensor
Chun, Sang Myung ;
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 29, issue 2, 2013, Pages 77~84
DOI : 10.9725/kstle.2013.29.2.077
A small engine-oil-deterioration detection sensor was developed and installed at the tip of a dipstick gage. The sensor part was manufactured using printed circuit board (PCB) manufacturing technology. A set of sensor covers was installed in order to protect the sensor and realize good signal stability. The small engine-oil-deterioration detection sensor system comprised a dual sensor having etched copper electrodes coated with gold and ceramic, a flexible PCB (FPCB) acting as electric wire, and a dummy PCB with only a lock connector. The sensor can easily be installed by insertion through the guide tube of a dipstick gage. Thus, a driver can easily handle it without further installation equipment. The sensor can determine the level of deterioration in the engine oil by estimating the corresponding dielectric constant of the engine oil.
Effects of Combination of the Load and the Apparent Area of Contact on Sliding Wear behavior of Mild Steel in a Pin-on-disc Type Apparatus
Lee, Han-Young ;
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 29, issue 2, 2013, Pages 85~90
DOI : 10.9725/kstle.2013.29.2.085
The effects of contact pressure on the sliding wear behavior of mild steel in a pin-on-disc type apparatus were investigated. Sliding wear tests were conducted with various combinations of the load and apparent area of contact. The wear behavior of mild steel as a function of sliding speed was independent of contact pressure. However, the wear rate at different sliding speeds was influenced by the load regardless of the apparent area of contact. This was attributed to the fact that there may be no difference in the real area of contact for any combination of the load and apparent area of contact.
Lateral Force Calibration in Liquid Environment using Multiple Pivot Loading
Kim, Lyu-Woon ; Chung, Koo-Hyun ;
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 29, issue 2, 2013, Pages 91~97
DOI : 10.9725/kstle.2013.29.2.091
Quantifying the nanoscale force between the atomic force microscopy (AFM) probe of a force-sensing cantilever and the sample is one of the challenges faced by AFM researchers. The normal force calibration is straightforward; however, the lateral force is complicated due to the twisting motion of the cantilever. Force measurement in a liquid environment is often needed for biological applications; however, calibrating the force of the AFM probes for those applications is more difficult owing to the limitations of conventional calibration methods. In this work, an accurate nondestructive lateral force calibration method using multiple pivot loading was proposed for liquid environment. The torque sensitivity at the location of the integrated probe was extrapolated based on accurately measured torque sensitivities across the cantilever width along a few cantilever lengths. The uncertainty of the torque sensitivity at the location of the integrated tip was about 13%, which is significantly smaller than those for other calibration methods in a liquid environment.
Influence of Inertial Mass on Tribological Characteristics between Sintered Friction Material and Disk
Lee, Jong Seong ; Kang, Bu Byoung ; Lee, Hi Sung ;
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 29, issue 2, 2013, Pages 98~104
DOI : 10.9725/kstle.2013.29.2.098
Cu-matrix-sintered brake pads and heat-resistant low-alloy steel are commonly applied to basic brake systems in high-energy moving machines. We analyzed how the tribological characteristics are influenced by the inertial mass. A high inertial mass decreased the friction coefficient by about 15% compared to a low inertial mass under all velocity conditions. The wear rates of the friction materials increased with the inertial mass. Thus, the inertial mass influences the friction coefficient and wear rate of the friction materials and disk but not the friction stability.
Dynamic Behavior Characteristics of Piston in Reciprocating Compressor
Cho, Ihnsung ;
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 29, issue 2, 2013, Pages 105~110
DOI : 10.9725/kstle-2013.29.2.105
Refrigeration and air-conditioning compressors used in home appliances, including refrigerators and air conditioners, are typically hermetic-type reciprocating compressors. Because the shell is sealed by welding, it should be designed to have a semi-permanent life. The energy consumption of a hermetic-type reciprocating compressor is low, but because it operates continuously to maintain a constant temperature inside the refrigerator, it has a certain base load. In this type of compressor, the driving motor operates at a high speed (about 3,000 - 3,600 rpm), which causes valve damage, friction, wear, and high-frequency noise. Many studies have been conducted to solve these problems. To enhance the reliability and efficiency of the reciprocating compressor, the design conditions and operating environment of journal bearings should be considered. Dynamic behavior analysis should be carried out in terms of the discharge pressure. The results showed that the load (discharge pressure) increases in the forward lookup zone and decreases in the backward lookup zone. When the revolution speed is increased, the maximum load decreases in the region where the maximum load operates.
Experimental Study on Reducing the Adherence Phenomenon between Idle Gear and Housing for Low-Pressure Fuel Pump of Excavator Engine
Lee, Il Kwon ; Kim, Seung Chul ; Kang, Ki Hwan ; Hur, Chang Soo ;
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 29, issue 2, 2013, Pages 111~116
DOI : 10.9725/kstle.2013.29.2.111
This paper describes the adherence phenomenon, including the tribological characteristics, of a low-pressure fuel pump in a diesel engine for an excavator. Most fuel pumps of a diesel-engine excavator are of the fixed-quantity-gear type and have low pressure. However, the developed pumps develop problems in the pumping system owing to performance instability. Cavitation, which is the main obstacle to stable driving in the pump, occurs between an idle gear and the housing to produce a serious adherence problem. The present study not only examined how to suppress cavitation in a pump but also developed a simple method to improve pump performance through the early creation of a lubrication film with a phosphoric acid coating on the surface of the idle gear. The results showed that the coating successfully prevents breakage of the idle gear due to adherence.
Study on Lubrication Characteristics of Lubrication for Lubricity Improver in Dimethyl Ether
Park, Cheonkyu ; Jang, Eunjung ; Jung, Choongsub ; Lee, Bonghee ; Na, Byungki ;
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 29, issue 2, 2013, Pages 117~123
DOI : 10.9725/kstle.2013.29.2.117
Dimethyl ether (DME) has a high cetane number that is suitable for diesel fuel. DME does not contain sulfur or nitrogen, and is an oxygenated fuel so it produces no particulate matter when combusted and is environmentally friendly. DME fuel for diesel engines show excellent material properties such as a lower volumetric heating value, lower boiling point, lower lubricity, and stronger solvent effect than light oil. This study experimentally examined a lubricity improver (LI) for dimethyl ether. A diesel LI based on biodiesel and fatty acid methyl ester was tested among DME LI candidates. The long-term storage stability and physical properties of the optimum LI for DME were determined.