Browse > Article
http://dx.doi.org/10.9725/kstle.2014.30.5.265

Frictional Heat Generation in Wet Clutch Engagement according to Groove Pattern on Clutch Pad  

Kim, HaeYong (Graduate School of Automotive Engineering, Kookmin University)
Jang, Siyoul (Dept of Mechanical Automotive Engineering, Kookmin University)
Kim, WooJung (Huyndai Powertech, Co.)
Publication Information
Tribology and Lubricants / v.30, no.5, 2014 , pp. 265-270 More about this Journal
Abstract
Frictional heat greatly influences the friction behaviors during clutch engagement. Therefore, the engagement of a wet or dry clutch is frequently not under control by the frictional heat. In a wet clutch, the frictional temperature also specially needs to be controlled, and in many cases, the clutch material is selected to prevent a temperature rise from the friction between friction pad and separator. However, only the selection of the clutch material cannot ensure sufficient control of the temperature rise by the friction. The groove pattern on a friction pad is designed for more flow rates of transmission fluid between the contact gap of clutch pad and separator for the cooling effect. In this work, grove patterns are designed for more flow rates out of the contact gap between friction pad and separator plate. Selected groove design shows the improvement flow rates of transmission fluid through both inner and outer radius, where most of the transmission fluid flows through the outer radius when the clutch is engaged due to the centrifugal force in conventional wet clutch groove. Several comparisons of the amounts of frictional heat generated on clutch pads are made in order to verify the decrease of the temperature rise according to the flow rates along the groove patterns.
Keywords
clutch engagement; frictional heat; groove pattern; heat conductio; transmissio fluid (TF); wet clutch;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
1 Zagrodzki, P. and Farris, T., "Analysis of Temperature and Stresses in Wet Friction Disks Involving Thermally Induced Changes of Contact Pressure", SAE Technical Paper No. 982035, 1998.
2 Pacey, D., Turnquist, R., "Modeling Heat Transfer in a Wet Clutch", SAE Technical Paper No. 901655, 1990.
3 Zagrodzki, P. and Truncone S., "Generation of Hot Spots in a Wet Multidisk Clutch During Short-Term Engagement", Wear Vol. 254, pp. 474-491, 2003.   DOI
4 Cho, J., Katopodes, N. and Kapas, N. "CFD Modeling of Squeeze Film Flow in Wet Clutch", SAE International No. 01-1236, 2011.
5 Cameron, T. M., McVOmbs, T., Tersigni S. and jao, T. "Flash Temperature in Clutches", SAE Technical Paper No. 01-3890, 2005.
6 Yuan, Y., Attibele, P. and Dong, Y., "CFD Simulation of the Flows Within Disengaged Wet Clutches of an Automatic Transmission", SAE Technical Paper No. 2003-01-0320, 2003.
7 Yang, Y., Robert C, L., Yih Fang, C., Yabe, H., "Modeling of Heat Transfer and Fluid Hydrodynamic for a Multidisc Wet Clutch", SAE Technical Paper No. 950898, 1995.
8 Deur J., Petric, J. and Asgari, J., and Hrovat, D., "Modeling of Wet Clutch Engagement Including a Thorough Experimental Validation", SAE Technical Paper No. 2005-01-0877, 2005.
9 Jang, J., Maki, R. and Khonsari, M., "Three-Dimensional Thermohydrodynamic Analysis of a Wet Clutch With Consideration of Grooved Friction Surfaces", ASME J. of Tribol. Vol. 133, pp. 011703-1-011703-12, 2011.   DOI
10 Edward J. Berger, "An Investigation of Friction-Induced Vibration In Automatic Transmission Wet Clutches", In Partial Fulfillment of the Requirements for the Degree of Doctor of Philosophy, UMI Number 9725510, 1996.
11 Kim, H., Jang, S., Kim, W., Shin, S.,"Analysis of Dynamic Behaviors of Transmission Fluid Film in the Wet Clutch Pad according to the Patterned Grooves," submitted to J. Korean Soc. Tribol. Lubr. Eng., Vol. 30, No. 2, pp. 92-98, 2014.   과학기술학회마을   DOI
12 Kitabayashi, H., Li, C. and Hiraki, H., "Analysis of the Various Factors Affecting Drag torque in Multiple- Plate Wet Clutches", SAE Technical Paper No. 01-1973, 2003.
13 Jang, S and J. Jeon, "Analysis of ATF Behavior Characteristic in Friction Clearance by Friction Plate Modeling of Automatic Transmission Wet clutch", Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference, pp. 292-299, 2008.