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Graphite Paticle Size에 따른 고온영역에서의 윤활 및 마찰 특성
김향래(Hyangrae Kim),최희범(Heebum Choi),허명준(Myungjun Heo),선신규(Shinkyu Sun),김성민(Seongmin Kim) 한국트라이볼로지학회 2009 한국트라이볼로지학회 학술대회 Vol.2009 No.11
The purpose of this paper is to study the effect of particle size of the graphites on the friction characteristics in brake pads. Test pieces are manufactured in organic pads by the hot press method and observed the high temperature performance by the scale tester. COF of T2 is higher than that of others and Braking temperature of T2 is lower. In disc roughness, T4 is lower than that of others.
정근중(Geunjoong Jeong),권창안(Changan Kwon),송현우(Hyunwoo Song),김향래(Hyangrae Kim),최희범(Heebum Choi),윤동주(DongJood Yoon) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
The purpose of this paper is to study the effect of heat treatment conditions of discs on braking performance of brake pad. The test discs are manufactured to apply different heat treatment conditions. And friction materials for racing (Semi-Metallic type) are used as a counter material. It is observed physical properties and friction performance as thermal conductivity, hardness, tensile strength, coefficient of friction, fade, wear etc. The experimental results shown that coefficient of friction of the heat-treated discs are higher than the unheat-treated disc.
Disc Rotor의 표면 가공에 따른 마찰 특성 연구
정근중(Geungjoong Jeong),송현우(Hyunwoo Song),최희범(Heebum Choi),김향래(Hyangrae Kim) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
the purpose of this paper is to investigate the friction characteristics according to surface processing methods of disc rotors. To avoid the trial and error method and find easily the main factor which contributes friction characteristics, taguchi method is employed to analyze test results. It is used taguchi L8(2<SUP>**</SUP>7) orthogonal matrix and evauated friction characteristics by scale tester.. By adapting taguci method, it is easy to investigate the influence of each factor in disc rotors. After analyzing the test results, the effect of factors and levels influenced friction characteristics is studied.
티탄산칼륨 Morphology에 따른 마찰재 제동 특성 연구
정근중(Geunjoong Jeong),권창안(Changan Kwon),송현우(Hyunwoo Song),최희범(Heebum Choi),김향래(Hyangrae Kim),허명준(Myeong-jun Heo),정진오(Chung Jin-Oh) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
the purpose of this paper is to study the effect of morphology of potassium titanates on the friction characteristics in the NAO(Non Asbestos Organic) brake pad. 3 potassium titanates are selected and test pieces are manufactured by hot press forming. It is observed physical properties and friction performance as density, hardness, average coefficient of friction, fade, wear etc. In fade, the coefficient of friction of non fiberous potassium titanates is more stable than that of fiberous potassium titanate. In wear and disc roughness, fiberous potassium titanate is better than non fiberous potassium titanates.
정근중(Geunjoong Jeong),권창안(Changan Kwon),송현우(Hyunwoo Song),최희범(Heebum Choi),김향래(Hyangrae Kim),운동주(Dong-Joo Yoon) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
The purpose of this paper is to study the effect of heat treatment conditions of discs on the friction characteristics in the disc brake system. Test pieces are manufactured to apply different heat treatment conditions. It is observed physical properties and friction performance as thermal conductivity, hardness, tensile strength, coefficient of friction, fade, wear etc. The thermal conductivity of the unheat-treated disc is higher than that of heat-treated discs. In fade, the coefficient of friction of the unheat-treated disc is higher than that of heat-treated discs because of lower braking temperature.
Brake 마찰재 Groan Noise 저감을 위한 Stick Slip 변화 연구
정근중(Geunjoong Jeong),권창안(Changan Kwon),송현우(Hyunwoo Song),김향래(Hyangrae Kim),최재희(Jae-Hee Choi),최광표(Gwang-Pyo Chio),성경필(Kyung-Pil Seong) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
Brake noise is devidede into low frequency noise and high frequency noise. Groan noise is the one of the low frequency noises. NAO(Non Asbestos Organics) friction materials were investigated to study the stick slip characteristics for reduction of groan noise of brake pads. Low materials which are mineral fiber, potassium titanate and cashew dust were tested in this investigation. The tribological properties of friction materials like stick slip, coefficient of friction, braking temperature, noise and wear were evaluated on a scale tester and groan noise was tested on vehicle. J3 and J4 occurred stick slip phenomenon made groan noise.
정근중(Geunjoong Jeong),권창안(Changan Kwon),송현우(Hyunwoo Song),김향래(Hyangrae Kim),최재희(Jae-Hee Choi),최광표(Gwang-Pyo, Chio),성경필(Kyung-Pil, Seong) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
NAO(Non Asbestos Organics) friction materials were investigated to study the role of metal sulfide lubricants on the friction performance. Four different metal sulfide lubricants including SbS₂, MoS₂, FeS and SnS were employed in this investigation. The tribological properties of friction materials like coefficient of friction, braking temperature, noise and wear were evaluated on a scale tester. In effectiveness, S4(SnS) shows better performance in low speed and S1(Sb₂S₃) shows good performance in high speed . S2(MoS2) and S3(FeS) show good noise property.