• Tribology and Lubricants
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• 제20권6호
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• pp.299-305
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• 2004

The wear properties of clutch facing materials with two different copper amounts were evaluated against the fly-wheel materials used in clutch system, such as gray cast iron and spheroidal graphite cast iron. Sliding wear tests were carried out for four different combinations with these clutch facing materials and flywheel materials at different speeds and applied loads. Results showed that the clutch facing material contained a higher copper amount had the better wear resistance. And using the gray cast iron as the counter material, clutch facing material resulted in the much lower wear rate, regardless of the copper amount. It is obvious that the wear properties of clutch facing material are influenced from the thermal conductivities of the clutch facing material and the counter material.

• Tribology and Lubricants
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• 제21권2호
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• pp.77-82
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• 2005

In previous paper, the wear properties of clutch facing materials with two different copper amounts against fly-wheel materials used in the clutch system were investigated by sliding wear tests at different applied loads and speeds. This paper have been aimed to evaluate the friction properties for clutch facing materials at the same test conditions as the previous paper. The experimental results indicated that the friction properties of clutch facing materials are influenced from the thermal conductivities of the clutch facing material and the counter material. The clutch facing material with the lower thermal conductivity and the fly-wheel material with the higher thermal conductivity showed the low and stable friction coefficient in the range of high sliding speed. This appears to be due to the formation of a film on the surface of the fly-wheel material.

• 한국자동차공학회논문집
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• 제10권4호
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• pp.129-135
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• 2002

The present article deals with the measurement and the numerical calculations far the temperature distribution near the facing of the lockup clutch. The rotating telemetry system is Introduced for the estimation inside high-speed torque converter For the numerical calculation, the effect of the convective heat transfer is considered as well as the conduction to the solid. The estimation shows that the oil temperature near facing rapidly rises as the lockup clutch is engaged. The numerical results shows good agreements with the experimental values for the maximum temperature near the facing of the lockup clutch.

• 오토저널
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• 제3권1호
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• pp.1-4
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• 1981

Clutch disc 의 facing은 사용할 때마다 마찰로 인하여 마멸된다. 마멸함에 따라 clutch cover의 구조상 clutch cover의 release lever가 올라와 clutch release bearing (thrust bearing)과의 간 극이 작아져서 드디어 이 간극이 없어지게 되면 release lever가 clutch release bearing을 누르게 되어 평상에도 clutch가 절반 정도로 떨어지는 상태로까지 됨으로써 clutch의 완전한 연결을 할 수 없어 slip이 일어나게 된다. 이상과 같은 문제점들을 해소하기 위하여 clutch의 control system을 수시로 조정하지 않으면 안되며 이러한 번거로움을 피하기 위하여 release lever가 올라옴으로써 release bearing과의 간극이 작아져서 자동적으로 일정한 간극을 유지하여 clutch의 slip을 방지하고 clutch기구의 내구성을 향상시키기 위한 것이 무조정식 release cylinder, 혹은 clutch adjuster이다. 이에 대한 신형식 두 종류의 구조, 작동 및 특징에 대하여 해설하여 본다.

• Tribology and Lubricants
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• 제5권1호
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• pp.21-27
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• 1989

A paper facirig, used for clutch disc or brake lining of the vehicles, is consisted of a combination of cellulose fiber of pulp with assorted filler and friction imparting particles, impregnated with a thermo-setting resin. In this study, as a substitution for the paper-production method, the molding-production method was attempted to produce the paper facings, and their frictional characteristics were investigated. According to the experimental results, it was estimated that the paper facings added with silica (SiO$_2$) have superior frictional characteristics, which is mused by the porosity and Mobs' hardness of the silica (SiO$_2$).