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Friction Bushing용 복합재료의 미끄럼 마찰마모특성에 관한 연구
이한영(Han-Young Lee),허대홍(Dae-Hong Heo),김태준(Tae-Jun Kim),조용재(Yong-Jae Cho),조범래(Bum-Rae Cho),허만대(Man-Dae Hur) 한국트라이볼로지학회 2006 한국트라이볼로지학회지 (Tribol. Lubr.) Vol.22 No.1
The sliding friction and wear properties of mineral fiber reinforced composite(MF) and glass fiber reinforced composites(GF) are investigated to clarify their field of use and the role of each fiber in friction material. Friction and wear test reveals that GF composite has better wear resistance even though with low friction coefficient, comparing with MF composite. Glass fiber strengthen effectively the matrix and may absorb friction energy to convert it into the fracture energy of them, as well as its lubricative role. However, mineral fiber in MF composite is too small to strengthen the matrix. Then MF composite are easily plowed and worn out by asperity on counter material. Friction coefficient of MF composite is higher friction coefficient than that of GF composite and varied widely with test.
Hydraulic Clutch Control System의 진동특성에 관한연구
소윤섭(Yoon-Sub So),허만대(Man-Dae Hur),김재영(Jae-Young Kim),강지우(Ji-Woo Kang),이홍범(Hong-Bum Lee),이재열(Jae-Yeol Lee),이종형(Jong-Hyung Lee),노승훈(Seung-Hoon Ro) 한국산업융합학회 2010 한국산업융합학회 논문집 Vol.13 No.1
This paper was originated to set up a test equipment and to obtain the proper installation condition of the plastic damper for the hydraulic clutch control system. Performance tests with different specifications have been applied to the damper to investigate the workability and the vibration characteristics of each case, and the result was utilized into the system simulation for the optimal condition for the damper. The procedure has been developed to set up a damper test system to analyze the dynamic properties and the operation of the system, and further to setup a simulation program for the realistic situations. The result can also be applied to the dampers and the clutch systems to be developed in the future for the property tests and the optimization of the installation conditions.
자동차 클러치 Diaphragm용 PTFE 코팅층의 미끄럼 마찰마모특성
이한영(Han-Young Lee),김태준(Tae-Jun Kim),조용재(Yong-Jae Cho),허만대(Man-Dae Hur) 한국트라이볼로지학회 2006 한국트라이볼로지학회 학술대회 Vol.2006 No.6
Diaphragm as a substitute for the role of clutch facing is contacted with primary wheel cover in newly designed clutch system. PTFE films have been coated on the diaphragm surface to control their friction properties. In this context, sliding wear and friction properties of the PTFE coating layer might have a great influence on performance of the clutch system. In this study, the effect of the size and its uniformity of raw powder for PTFE coating on sliding wear and friction properties were investigated. As a results, PTFE layer coated using the raw powder with small and uniform size has better wear resistance. This is considered that because the coating layer would have denser microstructure with a little amorphous in view of the lower melting point due to large surface area. And their friction coefficient becomes decrease at low sliding speed when the surface of counter material is smooth.
클러치용 Friction Bushing 마찰재의 미끄럼마모특성에 관한 연구
이한영(Han-Young Lee),조범래(Bum-Rae Cho),허대홍(Dae-Hong Hur),김태준(Tae-Jun Kim),조용재(Yong-Jae Cho),허만대(Man-Dae Hur) 한국트라이볼로지학회 2005 한국트라이볼로지학회 학술대회 Vol.2005 No.6
Grass fiber and mineral fiber have been used commonly as a reinforced fiber of friction material in automobile clutch system. Recently porous mullite produced by reaction sintering is also considered as a substitute for those fibers. In order to investigate the wear properties of the friction materials reinforced by them, plate-on-disc type wear test have been conducted at several test conditions. Grass fiber reinforced composite shows good wear properties. Wear loss of mineral fiber reinforced composite increase remarkably at room temperature. However at a high temperature of 100℃, wear properties of mineral fiber reinforced composite is the same as those of grass fiber reinforced composite. Mullite reinforced composite has good wear resistance under mild condition. However, the wear rate under severe condition increases due to the formation of composite film transferred on the counter surface.
자동차용 클러치 마찰재의 미끄럼마찰마모특성 해석 (제2보 마찰특성)
이한영(Han-young Lee),김근영(Geon-young Kim),허만대(Man-Dae Hur) 한국트라이볼로지학회 2005 한국윤활학회지(윤활학회지) Vol.21 No.2
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.
클러치용 Friction Bushing 마찰재의 미끄럼마찰특성에 관한 연구
이한영(Han-Young Lee),조범래(Bum-Rae Cho),허대홍(Dae-Hong Hur),김태준(Tae-Jun Kim),조용재(Yong-Jae Cho),허만대(Man-Dae Hur) 한국트라이볼로지학회 2005 한국트라이볼로지학회 학술대회 Vol.2005 No.6
In order to investigate the wear properties of the friction bushing materials for clutch system of automobile. plate-on-disc type wear test have been conducted for three different types of composites reinforced by grass fiber. mineral fiber and mullite at several test conditions. In this paper. the friction properties of three different types of composites have been analyzed. Grass fiber reinforced composite exhibits lower friction coefficient, even though it maintains the friction coefficient stably under all test condition. It aseems to be due to the lubricity of grass fiber. On the contrary, the friction coefficient of mineral fiber reinforced composite exhibits unstable even though it shows high friction coefficient. The friction coefficient of mullite reinforced composite lies between these of grass fiber and mineral fiber reinforced composite. However deviation and amplitude of friction coefficient at a high temperature of 100℃ increases due to the formation of composite film transferred on counter surface.
자동차용 클러치 마찰재의 미끄럼마찰마모특성 해석(제1보 마모특성)
이한영(Han-Young Lee),김근영(Geon-Young Kim),허만대(Man-Dae Hur) 한국트라이볼로지학회 2004 한국윤활학회지(윤활학회지) Vol.20 No.6
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.