습식 DCT의 드래그 토크 저감을 위한 클러치 패드 유로 설계
A Study on the Wet Clutch Pattern Design for the Drag Torque Reduction in Wet DCT System
1
조회
0
다운로드
2
인용
0
참고문헌
키워드
초록
The drag torque in the wet clutch system of a dual clutch transmission system is investigated because it is relatively high, up to 10 of the total output torque of the engine, even when the clutch is in the disengagement state with zero torque transfer. Drag torque results from the shear resistance of the DCTF between the friction pad and separator plate. To reduce the drag torque for ensuring fuel economy, the groove pattern of the wet clutch friction pad is designed to have a high flow rate through the pattern groove. In this study, four types of groove patterns on the friction pad are designed. The volume fraction of the DCTF (VOF) and hydrodynamic pressure developments in the gap between the friction pad and separator plate are computed to correlate with the computation of the drag torque. From the computational results, it is found that a high VOF and hydrodynamics increase the drag torque resulting from the shear resistance of the DCTF. Therefore, a patterned groove design should be used for increasing the flow rate to have more air parts in the gap to reduce the drag torque. In this study, ANSYS FLUENT is used to solve the flow analysis.
Abstract
The drag torque in the wet clutch system of a dual clutch transmission system is investigated because it is relatively high, up to 10 of the total output torque of the engine, even when the clutch is in the disengagement state with zero torque transfer. Drag torque results from the shear resistance of the DCTF between the friction pad and separator plate. To reduce the drag torque for ensuring fuel economy, the groove pattern of the wet clutch friction pad is designed to have a high flow rate through the pattern groove. In this study, four types of groove patterns on the friction pad are designed. The volume fraction of the DCTF (VOF) and hydrodynamic pressure developments in the gap between the friction pad and separator plate are computed to correlate with the computation of the drag torque. From the computational results, it is found that a high VOF and hydrodynamics increase the drag torque resulting from the shear resistance of the DCTF. Therefore, a patterned groove design should be used for increasing the flow rate to have more air parts in the gap to reduce the drag torque. In this study, ANSYS FLUENT is used to solve the flow analysis.
참고문헌 (5)
- 김해용, "습식클러치 패드의 Groove 패턴에 의한변속기유의 동적 거동", 한국윤활학회지, 30(2), pp.92~98 (2014), 한국윤활학회[DOI]
- Lee, S. H., "Study of Flow Behaviors in the Groove Patterns of Wet Clutch Pad", J. Korean Soc. Tribol. Lubr. Eng, 2013(10), pp.108~109 (2013)
- Vladimir Ivanović, "Experimental Characterization of Wet Clutch Friction Behaviors Including Thermal Dynamics", SAE International Journal of Engines, 2(1), pp.1211~1220 (2009), SAE International[DOI]
- Iqbal, S., "Mathmatical Model and Experimental Evaluation of Drag Torque in Disengaged Wet Clutches", ISRN Tribol., 2013 (2013)[DOI]
- Kitabayashi, H., "Analysis of the Various Factors Affecting Drag Torque in Multiple-Plate Wet Clutches", SAE Int. J. Engines (2003)