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최창환(C. H. Choi),허용(Y. Huh),김형익(H. I. Kim),석창성(C. S. Seok) 한국정밀공학회 2006 한국정밀공학회 학술발표대회 논문집 Vol.2006 No.5월
The limited slip differential(LSD) is a device which enables the driving force to be transmitted from one slipping wheel to another wheel in such case that the car is stuck in clay or snow. When the unwanted slipping occurs on one wheel, the LSD temporarily restraints the differential motion to transmit the driving force in the other wheel. So far, many types of LSD were developed such as mechanical lock type, disk clutch type, viscous coupling type, torsion type and multiple clutch type. we designed a new type of the hydraulic LSD which uses the principle of trochoid gear pump.
허용(Y. Huh),김형익(H. I. Kim),배봉국(B. K. Bae),석창성(C. S. Seok) 한국정밀공학회 2004 한국정밀공학회 학술발표대회 논문집 Vol.2004 No.10월
The limited slip differential(LSD) is a device which enables the driving force to be transmitted from one slipping wheel to another wheel in such case that the car is stuck in clay or snow. When the unwanted slipping occurs on one wheel, the LSD temporarily restraints the differential motion to transmit the driving force in the other wheel. So far, many types of LSD were developed such as mechanical lock type, disk clutch type, viscous coupling type, torsion type and multiple clutch type. However these types of LSD is too complicated and expensive, so it is used only for 4WD outdoor vehicles, military vehicles, and a portion of deluxe car. So, many studies has been devoted to improve new types of LSD to cover those demerits of existing LSDs that the hydraulic LSD is developed as arepresentative result of that. The hydraulic LSD which uses the principle of gear pump is packed with viscous oil in tight container. When a slip occurs on one wheel, the hydraulic LSD generates torque caused by high oil pressure in the container. This study has been devoted to suggest an improved hydraulic LSD. In order to achieve it, we designed a new type of hydraulic LSD, produced it and did a rig test with it on real vehicle. From the rig test, it has been confirmed that the new type of hydraulic LSD can be directly applied to exiting vehicles without changing the design criteria.
전자제어식 차동제한장치의 솔레노이드 어셈블리 형상정밀도 향상을 위한 가공변수 최적화
오상균(Sang-Kyun Oh),서창희(Chang-Hee Suh),이락규(Rac-Gyu Lee),정윤철(Yun-Chul Jung),김영석(Young-Suk Kim) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
Mechanical Limited Slip Differential(LSD) is replacing by the electro-magnetic LSD which has good characteristics such as fast response and active control of the vehicle. Coil housing made of STS 304 is one of the most important part in the solenoid assembly of the electro-magnetic LSD. High geometrical accuracy is a prerequisite to the manufacture of coil housing, but precision machining is difficult because the thickness of STS 304 is very thin. The aim of this study is to optimize of cutting parameters in the coil housing. Contact pressure of jaw, cutting speed, feed rate are considered as major parameters to control the geometrical accuracy. Optimized cutting condition was selected using Taguchi method and orthogonal array to evaluate the effectiveness of each parameters. The feed rate was the most effective parameter on the influence of the geometrical accuracy.
신광용(K.W Shin),김형모(H.M Kim),이기용(K.Y Lee),박순섭(S.S Park),최동훈(D.H Choi) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
The differential in an axle is an essential part that functions as transmitting power generated by the engine to the wheels and also balancing speed difference between the wheels when the vehicle cornering. In an absence of the differential, when one of the wheels is on the icy or muddy road, one of its shortcomings is that the vehicle looses the traction. This shortcoming is complemented by a characteristic of device, the Limited Slip Differential(LSD). Basically, the LSD restrains or locks to a certain degree the slipping of the wheels by the friction of among the components within the device as the vehicle drives on the slippery road conditions. In this research, among many types, helical gear type LSD is investigated. First, to develop the helical gear type LSD, the helix angles of gears were derived and the case that envelopes the gears was designed. Then, to test and access, the designed LSD was prototyped. The characteristics of designed part were accessed by dynamometer tests under the predefined conditions and the results were compared with that of the bench marker, wet-clutch-type LSD. Through the research, a design procedure of helical gear type LSD was proposed. The use of FEA enabled us to predict the structural safety of the part. The actual test confirmed the proposed ideas. In conclusion, the application of helical gear type LSD in a vehicle is very feasible. However, the further research to analyze the parameters that influence the functional characteristics in depth and to investigate the algorithm of the design optimization must be followed.
가공변수의 불확실성을 고려한 전자제어식 차동제한장치 솔레노이드 어셈블리의 강건 최적설계
오상균(Sang Kyun Oh),이광기(Kwang Ki Lee),서창희(Chang Hee Suh),김영석(Young Suk Kim) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.5
전자제어식 차동제한 장치는 기계식에 비해서 능동제어가 가능하고 응답성이 좋아 기계식을 대체해 나가고 있다. STS 304 재질의 코일 하우징은 전자제어식 차동제한장치의 솔레노이드 어셈블리에서 가장 중요한 부품이다. 코일 하우징의 제조시 높은 형상 정밀도가 필수적이나, STS 304의 박판 사용과 가공변수의 변동으로 정밀 가공이 어렵다. 본 연구의 목적은 코일하우징의 가공조건에서 강건해를 구하여 평균과 변동을 최적화 하는 것이다. 코일하우징의 형상정밀도 평균과 표준편차를 최소화 하기 위한 주요 변수로 조의 척킹압력, 절삭속도, 이송속도의 평균과 표준편차가 고려됐다. 가공변수의 변동을 고려하여 평균과 표준편차를 모두 최소화 하는 최적의 조건을 선정하고자 반응표면모델 기반 2 차 테일러 전개를 통한 강건 최적설계를 수행하였다. Mechanical Limited Slip Differential(LSD) is replaying by the electro-magnetic LSD because it has faster response and better active control characteristic for the vehicle. Coil housing made of STS 304 is one of the most important part in the solenoid assembly of the electro-magnetic LSD. High geometrical accuracy is a prerequisite to the manufacture of coil housing, but precision machining is difficult because of the very thin thickness of STS 304 and the variance of machining variables. The aim of this study is to optimize the mean and variance in the coil housing by finding the robust solution of machining ones. Mean and standard deviation of contact pressure of jaw, cutting speed, and feed rate are considered as major parameters to minimize the geometrical mean and variance. The response surface model based second order Taylor series is combined together to minimize the mean and variance of machining ones.
가공변수의 불확실성을 고려한 전자제어식 차동제한장치 솔레노이드 어셈블리의 강건 최적설계
오상균(Sang Kyun Oh),이광기(Kwang Ki Lee),서창희(Chang Hee Suh),정윤철(Yun-Chul Jung),김영석(Young Suk Kim) 대한기계학회 2011 大韓機械學會論文集A Vol.35 No.10
전자제어식 차동제한 장치는 기계식에 비해서 능동제어가 가능하고 응답성이 좋아 기계식을 대체해 나가고 있다. STS 304 재질의 코일 하우징은 전자제어식 차동제한장치의 솔레노이드 어셈블리에서 가장 중요한 부품이다. 코일 하우징의 제조시 높은 형상 정밀도가 필수적이나, STS 304의 박판 사용과 가공변수의 변동으로 정밀 가공이 어렵다. 본 연구의 목적은 코일하우징의 가공조건에서 강건해를 구하여 평균과 변동을 최적화 하는 것이다. 코일하우징의 형상정밀도 평균과 표준편차를 최소화 하기 위한 주요 변수로 조의 척킹압력, 절삭속도, 이송속도의 평균과 표준편차가 고려됐다. 가공변수의 변동을 고려하여 평균과 표준편차를 모두 최소화 하는 최적의 조건을 선정하고자 반응표면모델 기반 2차 테일러 전개를 통한 강건 최적설계를 수행하였다. The mechanical limited slip differential (LSD) in vehicles is being replaced by the electromagnetic LSD because of its fast response and better active control characteristics. The coil housing made of STS 304 is one of the most important parts in the solenoid assembly of the electromagnetic LSD. High geometrical accuracy is a prerequisite for the manufacture of such coil housings, but precision machining is difficult because of the use of STS 304 thin plate and the variance in machining variables. The aim of this study is to optimize the mean and variance of the shape accuracy in the coil housing by finding a robust solution for the machining process conditions. The mean and standard deviation of the jaw contact pressure, cutting speed, and feed rate are considered to be the major parameters for minimizing the geometrical mean and variance. The response surface model based on the second-order Taylor series is combined together to minimize the mean and variance of the shape accuracy of the coil housing.
편영식(Y. S. Pyoun),박정현(J. H. Park),김호태(H. T. Kim),이영춘(Y. C. Lee),김훈(H. Kim),박병수(B. S. Park),이상훈(S. H. Lee) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
In order to design new type of Limited Slip Differentials(LSD) for Sports Utility Vehicles(SUV) which was supported by Ministry of Commerce Industry and Energy, Reverse Engineering is applied to evaluate existing LSDs and mechanical properties of materials, thermal treatment and design criteria are derived. Design parameters of new LSD parts are decided based on these information. CAE tools such as CATIA and APM WinMachine are utilized for reverse engineering of existing LSDs and decision of design parameters of new LSD.