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수동 변속기용 카본 마찰재 싱크로나이져 링의 개발 및 적용
장성식(Seongsik Jang),이창호(Changho Lee),신남선(Namsun Shin),조홍상(Hongsang Cho),유광석(Kwangsuk You) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
Various friction materials are used in synchronizer rings of manual transmissions. Stable characteristics of friction material has been required in terms of shift feeling and durability that are important requirements for customer satisfaction. Durability and higher μ of carbon are superior to other friction materials used for this application. Basically, synchronizer ring with friction lining is made of base material for the ring, which can be brass, steel or powdered metal. Friction lining can be made from carbon, paper, Mo etc. Carbon lined brass synchronizer ring has been developed and introduced into our SUV and passenger cars for global markets. Test data showed significant improvement of durability, consistent friction coefficient over the durability test period.
차량용 수동 변속기의 후진변속울림 방지장치에 대한 고찰
장성식(Seongsik Jang),신남선(Namsun Sin),양민석(Minseok Yang) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
Varieties of reverse braking systems for manual transmission are investigated. Reverse braking system is different from synchronizer mechanism which is used for forward gears in automotive manual transmission. The purpose of reverse braking system of manual transmission is to eliminate clashing or grinding noise when shifting to reverse gear. In the constant mesh arrangement, reverse idler gear has to engage two other gears to complete torque flow when the vehicle is stationary while shifting to reverse, input shaft with the reverse pinion could still be spinning due to clutch disk inertia and this will create the clashing or grinding noise. The reverse braking system stops the rotation of the input shaft and prevents clashing noise. Clashing noise by reverse gear shifting strongly depends on driver’s behavior as described, e.g., enough spin down time, more over 3 sec, will seldom generate clashing noise even without reverse braking system. However the reverse brake will guarantee that at all times, the spinning input shaft is stopped even when shifting quickly to reverse. Characteristics of each reverse braking system is reviewed and tabulated for better understanding.
장성식(Seongsik Jang),신남선(Namsun Shin),배동영(Dongyoung Bae) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
In this paper, main factors of manual transmission internal shift control part about shift force and how can we analysis and optimize the shift force by mathematical approach are presented. 3 kinds of detent device on Shift Tower and Fork-shift and Sleeve ASM are considered as main control factors and its contribution for shift force are analyzed. Shift force optimization is based on driver’s requirement for comfortable shifting in the view of shift stroke and force variation characteristics that can recognized as driver feeling. To make close correlation of real driver shift feeling and analytical force value, frictionless component and minimized free play of each component are recommended.
1D 해석 기법을 이용한 변속기 회전 손실 특성 및 오일 레벨 최적화에 관한 연구
김재영(Jaiyeong Kim),유영우(Yeongwoo Yoo),장성식(Seongsik Jang) 한국자동차공학회 2013 한국자동차공학회 학술대회 및 전시회 Vol.2013 No.11
Energy efficiency is very important to modern vehicles. The new vehicle which alter internal combustion vehicle such as Hybrid, electric vehicle and fuel cell consider about efficiency significantly. In electric vehicle spin loss is important to increase power efficiency and battery life. To reduce Spin loss there are many factor to control and design. One of the method to decrease the loss is to balance the oil level in the gear box. In this study, using common theoretical formula and some estimation to calculate spin loss for electric vehicle drive system. Some specific level can be achieved to meet more efficient on this drive system. For the accurate result, this method will be upgraded and complicated in further study.
박호일(Hoil Park),최성배(Sungbae Choi),장성식(Seongsik Jang),황준영(Junyoung Hwang) 한국소음진동공학회 2015 한국소음진동공학회 학술대회논문집 Vol.2015 No.4
There are several flow noises induced from compressors of automotive turbochargers. In the previous study, the flow noise was analyzed to be around 1.6k~1.8kHz from gasbench tests, and could be reduced by machining a proper rectangular groove around compressor inlet before its main blades. The groove was shown to be very effective for removing the noise under the small difference of compressor performance. It was all right because the engine performance was high enough to cover the difference. This study was interested in another flow noise, rather the higher and wider frequency band, 4k~6kHz ? the 3<SUP>rd</SUP> order of turbocharger speed, and proposed an optimal configuration of the groove, lowering the noise and maintaining the performance. A best shape was proposed, and was confirmed to be satisfied with the performance on an engine dynamometer and the noise target on a vehicle.
차량 NVH 개선을 위한 Powertrain mounting boss stiffness 관한 연구
조미희(Mihui Jo),유영우(Yeongwoo Yoo),장성식(Seongsik Jang) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
This study is powertrain mounting boss stiffness analysis for improving vehicle NVH. This paper describes a procedure to calculate the Free-Free boss stiffness of powertrain mounting bosses using a finite element model of the full powertrain. For individual boss stiffness analysis, inertia relief method is used in this study. The predicted individual boss stiffness is used for design evaluation of boss stiffness to improve vehicle NVH, and boundary conditions in a component mounting bracket modal analysis. Composite boss stiffness analysis is to improve stiffness assessment of a set of bosses, by replacing the assessment of individual bosses with the combined effects of their stiffness and their relative location.
5단 수동변속기의 후진변속장치 싱크로나이저 적용에 대한 고찰
배동영(Dongyoung Bae),윤상목(Sangmok Yoon),장성식(Seongsik Jang),신남선(Namsun Shin) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
This paper presented application of full reverse synchronizer system to the current 5 speed transmission without package change. There are three kinds of reverse shifting systems: non brake system, semi synchronizer system and full synchronizer system. The last two types, semi-synchronizer and full synchronizer systems, are used to prevent clashing and grinding noise when shifting to reverse gear. This paper explained the merits and demerits of applying full reverse synchronizer system by comparing the system with other two types of synchronizer systems, non brake and semi synchronizer systems. Components and layout of the three systems were also described. A case example of applying full synchronizer system without package impact was provided and points to be considered were suggested when applying reverse full synchronizer system.
1D 해석을 이용한 수동 변속기 클러치 페달 특성 최적화 기법에 관한 연구
정영재(Youngjae Jung),유영우(Yeongwoo Yoo),장성식(Seongsik Jang) 한국자동차공학회 2013 한국자동차공학회 학술대회 및 전시회 Vol.2013 No.11
This paper deals with 1D simulation method of clutch pedal characteristics and optimization strategy for the manual gearbox. Most of clutch system is consist of mechanical parts and hydraulic components to transfer pedal force until diaphragm spring on clutch cover system. It is very important to predict mechanical friction and hydraulic loss for the exact pedal behavior. The general mechanism will be dealt on the first half with introduction and simulation method will be followed. This simulation is based on MATLAB and AMESim 1D analysis tools and correlation results are also shown on conclusion section. Particularly the major parameters which make the highest influences to the pedal characteristics will be studied and design target values will be also provided to obtain the optimized pedal reaction behavior for potential customers. Once the simulation model is correlated, this method will be taken center stage with high confidence level and it can be utilized for design determination and optimization with less cost and time.