• Title/Summary/Keyword: 듀얼 클러치 변속기

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Fatigue Study for a Shift Fork of a Dual Clutch Transmission (듀얼클러치 변속기의 쉬프트 포크에 관한 피로해석 연구)

  • Kim, Kyounghoon;Jeong, Jongkyu;Won, Jongjin;Jeong, Jayil
    • Journal of Auto-vehicle Safety Association
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    • v.4 no.1
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    • pp.23-26
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    • 2012
  • 본 논문은 듀얼클러치 변속기 변속 메커니즘 개발을 위한 동역학적 시뮬레이션 해석 및 피로수명 해석에 관한 연구이다. 캠을 이용한 쉬프트 포크의 이송으로 기어를 변속하는 개념을 갖는 쉬프트 메커니즘의 작동성 및 설계안 검증을 위해 캠의 회전 속도, 접촉면의 경계조건 및 싱크로나이저 슬리브에서의 저항을 반영한 모델링을 구성하여 동역학적 시뮬레이션을 실시하였다. 각 파트의 응력 및 변형률 발생을 해석하여 설계 개선안을 도출하고, 개선안이 반영된 최종 시작모델의 시뮬레이션 상 최대 응력 발생 시점에서 시프트 포크의 각 접촉면 별 외력 작용을 분석하여 이를 적용한 피로 해석을 진행하였다.

Characteristic Dynamics Torque Vibration of Behavior in Wet Clutch Engagement for Dual Clutch Transmissions (듀얼클러치 변속기용 습식클러치 체결에 따른 토크 변화에 대한 동적거동)

  • Cho, Jaecheol;Kim, Woojung;Jang, Jaeduk;Jang, Siyoul
    • Transactions of the Korean Society of Automotive Engineers
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    • v.24 no.2
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    • pp.183-190
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    • 2016
  • Engine torque is transferred to the transmission where drag torque is minimized improving fuel efficiency. This is particularly true in a wet clutch pack. This study measures slip friction when the wet clutch pack in a DCT (Dual-Clutch Transmission) is disengaged, and the friction pads are slipping. Shudder engagement velocity, and applied forces can be measured under various working conditions through these torque transfer experiments. Test results demonstrate that the design parameters, and engagement conditions of wet clutch packs can be optimized to reduce shudder and frictional vibration during engagement in a dual clutch transmission.

Transmission Efficiency of Dual-clutch Transmission in Agricultural Tractors (농업용 트랙터 듀얼 클러치 변속기의 동력전달 효율 분석에 관한 연구)

  • Moon, Seok Pyo;Moon, Sang Gon;Kim, Jae Seung;Sohn, Jong Hyeon;Kim, Yong Joo;Kim, Su Chul
    • Journal of Drive and Control
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    • v.19 no.1
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    • pp.43-50
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    • 2022
  • The aim of this study was to conduct basic research on the development of a dual-clutch transmission(DCT) and automatic transmission for agricultural tractors. The DCT layout and the DCT simulation model were developed using commercial software. Power transmission efficiency of the DCT and component power loss were analyzed to verify the developed simulation model. Power loss analysis of the components was conducted according to previous studies and ISO(International Organization for Standardization) standards. The power transmission efficiency of the DCT simulation model was 68.4-91.5% according to the gear range. The power loss in the gear, bearing, and clutch DCT system components was 0.75-1.49 kW, 0.77-2.99 kW, and 5.24-10.52 kW, respectively. The developed simulation model not include the rear axle, differential gear, final reduction gear. Therefore actual power transmission efficiency of DCT will be decreased. In a future study, an actual DCT can be developed through the simulation model in this study, and optimization design of DCT can be possible by comparing simulation results and actual vehicle test.

Development of Shift Map for TMED Type DCT PHEV in Charge Sustaining Mode considering Transmission and Motor Losses (변속기 및 모터 손실을 고려한 TMED Type DCT PHEV의 CS 모드 주행 시 변속맵 개발)

  • Jeon, Sungbae;Bae, Kyunggook;Wi, Junbeom;Namkoong, Choul;Goo, Changgi;Lee, Ji-suk;Hwang, Sung-Ho;Kim, Hyunsoo
    • Transactions of the Korean Society of Automotive Engineers
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    • v.25 no.3
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    • pp.367-373
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    • 2017
  • In this paper, a new shift map was proposed to improve the fuel economy of a transmission mounted electric device(TMED) type dual clutch transmission(DCT) plug-in hybrid electric vehicle(PHEV) by considering transmission and motor losses. To construct the shift map, powertrain efficiencies of the engine-DCT-motor were obtained at each gear step. A shift map that provides the highest powertrain efficiency was constructed for the given wheel torque and vehicle speed. Simulation results showed that the fuel economy of the target PHEV can be improved by the new shift map compared with the existing engine optimal operating line(OOL) shift control.

Study on the Lubricant Flow Behaviors in the Wet Clutch Pack System of Dual Clutch Transmission (습식 DCT(Dual Clutch Transmission) 클러치 팩 내부에서의 체결 동작에 따른 변속기유 거동 연구)

  • Kim, WooJung;Lee, SangHo;Jang, Siyoul
    • Tribology and Lubricants
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    • v.33 no.3
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    • pp.85-91
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    • 2017
  • This work studies the flow behaviors in the gap between the friction pad and separator in wet-clutch systems. The fluid volume of the lubricant is modeled using the entire system of wet-clutch pack of a dual clutch transmission that has larger outer radius of odd gear shifts and smaller inner radius of even gear shifts. Flow behaviors in the gap of the clutch pad are computed using the gear shift modes that consider the real relative velocities between the friction pad and separator. Flow behaviors in the gap of the disengaged clutch pad are mainly investigated for the wet-clutch system, whereas the engaged clutch pad is modeled with no fluid rate through the contacting surfaces. The developed hydrodynamic fluid pressures and velocity fields in the clutch pad gap are computed to obtain the relevant information for managing flow rates in wet-clutch packs under dual operating conditions during gear shifts. These hydrodynamic pressures and velocity fields are compared on the basis of each gear level and gap location, which is necessary to determine the effects of groove patterns on the friction pad. Shear stresses in the gap locations are also computed on the basis of the gear level for the inner and outer clutch pads. The computed results are compared and used for the design of cooling capacity against frictional heat generation in wet-clutch pack systems.

The Effect of Dual Clutch Transmissions on the Stability Emissions Characteristic in a Gasoline Direct Injection Engine (GDI 엔진에 DCT 적용에 따른 배기 배출물 특성에 미치는 영향)

  • Kim, Kwang Lae;Roh, Hyun Gu
    • Journal of ILASS-Korea
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    • v.20 no.3
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    • pp.156-161
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    • 2015
  • This paper described the effect of dual clutch transmissions on the stability emissions characteristic in a GDI engine at vehicle Inspection and Maintenance(I/M) program. In order to investigate the influence of direct injection gasoline engine with DCT, the experimental apparatus consisted of GDI engine with 4 cylinder, dynamometer and exhaust emissions analyzer. Analyzed emission gas include CO, HC and NOx results that DCT vehicle in the case of NOx, HC in automatic transmission vehicles less than 1/2 level was confirmed to be exhausted. However vehicle specific power increases CO also has increased.