Chang Am LS Co.

Asan, South Korea

Chang Am LS Co.

Asan, South Korea
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Lee C.-H.,Inha University | Choi J.Y.,Inha University | Jeon I.S.,Chang Am LS Co. | Cho W.,Chang Am LS Co. | Yun H.,Chang Am LS Co.
Tribology and Lubrication Technology | Year: 2012

Constant velocity (CV) joints have been widely used for modern vehicles. The sealed grease of CV joints must provide low friction and wear protection for the lifetime use of the vehicle. Grease performance affects the vibration and noise level in the vehicle. Vehicles that have traveled long distances may suffer mechanical and thermal overloads, thus causing the grease to degrade due to changes in its physical and chemical properties. In this article, the grease degradation phenomenon in CV joints is investigated by collecting grease samples from both tripod joints and Birfield joints in actual vehicles that traveled various ranges of distance. In order to analyze the property changes of grease, grease penetration and oxidation induced time are measured using a penetration meter and infrared (IR) spectrometer, respectively. Where oxygen induced time (OIT) is the point that the oxidation occurs in grease. The performance variations of grease are investigated by measuring the friction and wear using linear-oscillation (SRV, Schwingung (oscillation) Reibung (friction) Verschleiss (wear)) test machine as well as the four-ball wear tester. Degradation of properties as well as performance in CV joint grease due to physical and/or chemical changes is identified.


Lee D.-W.,Inha University | Lee K.,Inha University | Lee C.-H.,Inha University | Kim C.-H.,Chang Am LS Company | Cho W.-O.,Chang Am LS Company
Journal of Tribology | Year: 2013

Research on the applications of magneto-rheological (MR) elastomers in mechanical engineering has greatly expanded, whereas the performance of MR fluids in tribology has rarely been investigated. In this study, the tribological characteristics of an MR elastomer are identified in order to improve tribological performance with the activation of a magnetic field. Microscopic changes in the surface and in the MR particles are investigated. The friction and wear of an MR elastomer is measured using a pin-on-disc tester under applied and unapplied magnetic fields. In addition, the linear sliding friction of an MR elastomer with respect to different velocities and loads is measured using a linear sliding tester. © 2013 by ASME.


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Chang Am Ls Co. | Date: 2010-08-10

Anti-rust oil, Anti-rust grease. Industrial grease, Industrial lubricants, Lubrication oil, Cutting fluids, Gear oil, Chain oil in the nature of lubricating oil, Illuminating grease in the nature of lubricating grease, Grinding oil in the nature of lubricating oil, Tapping oil in the nature of lubricating oil, Forging oil in the nature of lubricating oil, Silicone oil in the nature of lubricating oil, Hydraulic oil, Automotive greases, Motor greases in the nature of lubricating grease, Silicone greases in the nature of lubricating grease, Lubricating grease, Anti-friction greases in the nature of lubricating grease, Silicone mould-release oil in the nature of lubricating oil.


Lee C.H.,Inha University | Lee D.W.,Inha University | Choi J.Y.,Inha University | Choi S.B.,Inha University | And 2 more authors.
Journal of Tribology | Year: 2011

Recently, research on the application of magnetorheological (MR) fluid in mechanical engineering has been widely expanded, while the performance of MR fluid in tribology has also been investigated. In this study, a modification of MR fluid, which is modified by adding certain additives, is attempted to improve tribological performance. After modification, wear and friction are measured by four-ball wear tester and linear-oscillation (SRV) tester under no magnetic fields. Subsequently, the oxidation induction time (OIT) is evaluated by pressure differential scanning calorimetry (PDSC). Then, to observe the tribological performance under magnetic fields, pin-on-disk test is conducted to confirm the effects of the commercial MR fluid and modified MR fluid on friction and wear in different operating and magnetic conditions. Also, the modification effects on surface roughness are investigated by using a profilometer. Moreover, the microscopic changes of surfaces and MR particles are investigated by using scanning electron microscopy (SEM). © 2011 American Society of Mechanical Engineers.

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