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Simulation to Estimate the Output Torque Characteristics and Temperature Rise of a Transmission Wet Clutch during the Engagement Process
Technical Paper
2018-01-0402
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
During a typical shift event, one or more clutches are brought to engagement while others are released in order to change the torque transmission path. A mismatch in torque level and handshake timing between the off-going and on-coming clutches affects the shift quality. In order to capture the dynamic behavior of the torque response and estimate the temperature rise at the friction disk and separator plate interfaces during the engagement process, several numerical models have been developed. The earliest of these models was presented by Berger et al. which was later modified and enhanced by Natsumeda et al. and Yang et al. However, these models cannot capture the dynamic behavior of grooved clutch disks. Hence, development of a wet clutch engagement simulation model using commercial CFD simulation tool, which can capture the dynamic behaviors of no groove and grooved disks, becomes a pressing need. In this paper, we have presented an engagement simulation model using Star CCM+ simulation software and also discussed our observations from the simulation results. The key input parameters are squeeze velocity of the oil film, oil inlet temperature, initial rotating speed and flow rate. The porosity of the friction materials, friction co-efficient, compressive strain and flow factors are also taken into account. Our simulation model provides a helpful means to realize the influence of oil flow rate, rotating speed, applied pressure and groove patterns on the output torque behavior and temperature rise.
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Citation
Mahmud, S., Pahlovy, S., and Ogawa, M., "Simulation to Estimate the Output Torque Characteristics and Temperature Rise of a Transmission Wet Clutch during the Engagement Process," SAE Technical Paper 2018-01-0402, 2018, https://doi.org/10.4271/2018-01-0402.Data Sets - Support Documents
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References
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- Berger , E.J. , Sadeghi , F. , and Krousgrill , C.M. Analytical and Numerical Modeling of Engagement of Rough Permeable Grooved Wet Clutches Journal of Tribology 119 143 148 1997
- Davis , C.L. , Sadeghi , F. , and Krousgrill , C.M. A Simplified Approach to Modeling Thermal Effects in Wet Clutch Engagement: Analytical and Experimental Comparison Journal of Tribology 122 110 118 2000
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- Natsumeda , S. and Miyoshi , T. Numerical Simulation of Engagement of Paper Based Wet Clutch Facing Journal of Tribology 116 2 232 237 1994
- Yang , Y. , Lam , R. , and Fujii , T. Prediction of Torque Response During the Engagement of Wet Friction Clutch SAE Technical Paper 981097 1998 https://doi.org/10.4271/981097
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- Mahmud , S. , Pahlovy , S. , Kubota , M. , Ogawa , M. et al. Multi-Phase Simulation for Predicting Better Groove Pattern of the Clutch Disk for Low Drag Torque SAE Technical Paper 2015-01-1977 2015 https://doi.org/10.4271/2015-01-1977
- Mahmud , S. , Pahlovy , S. , Kubota , M. , Ogawa , M. et al. Multi-Phase Simulation for Studying the Effect of Different Groove Profiles on the Drag Torque Characteristics of Transmission Wet Clutch SAE Technical Paper 2016-01-1144 2016 https://doi.org/10.4271/2016-01-1144