This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Probability Considerations in Design Case Study- Analysis of Multi Plate Wet Clutch for Judder and Rattling
ISSN: 0148-7191, e-ISSN: 2688-3627
Published January 17, 2007 by The Automotive Research Association of India in India
Annotation ability available
Event: SIAT 2007
Most of the studies on judder and rattling in power train with multi plate wet clutches are focused on the slip-stick phenomena of the friction materials, lubrication used, thermo-elastic behavior of friction materials, tribology considerations, boundary layer, asperity contact theories and so on. In this paper, a different approach for problem solution is presented. This is based on the concept of mutual matching and differences seen in the behavior of mating components under different assembly boundary conditions, since a very small proportion of mass production exhibits judder and rattling. The clutch and the engine components are assembled in random orientation about the axis of rotation. The probability considerations are extended to explain the basic, root cause of variation on problem occurrence and inconsistency of problem repeatability, even though all the components are within design specifications. The effects of mutual matching of clutch assembly parts and possible variations during clutch fitment on an engine due to the geometric tolerances allowed are objectively evaluated through the design for assembly (DFA) considerations using solid models of parts. An approach towards the design of clutch actuating components for accommodating misalignments is suggested. A design leading to the complete solution to the problem is evolved. The validation of the design was executed with many permutations and combinations on the different assemblies and different engines. The design refinements were introduced based on the vehicle validations and test rig observations under various operating conditions.
|Technical Paper||Fundamental Studies on ATF Friction, Part II|
|Technical Paper||A Straightening Strategy for the Automobile Industries|
|Technical Paper||Carbon Fiber for Wet Friction Applications|
- Ashutosh Jahagirdar - High-Technology Transmission Systems (I) Pvt. Ltd. Aurangabad, India
- Ramesh Gehaney - High-Technology Transmission Systems (I) Pvt. Ltd. Aurangabad, India
- Praveen Kumar Gupta - High-Technology Transmission Systems (I) Pvt. Ltd. Aurangabad, India
- Sanjay Deshpande - High-Technology Transmission Systems (I) Pvt. Ltd. Aurangabad, India
CitationJahagirdar, A., Gehaney, R., Gupta, P., and Deshpande, S., "Probability Considerations in Design Case Study- Analysis of Multi Plate Wet Clutch for Judder and Rattling," SAE Technical Paper 2007-26-069, 2007, https://doi.org/10.4271/2007-26-069.
- Mäki Rikard, Doctoral thesis on Wet Clutch tribology, “Friction Characteristics in Limited Slip Differentials”, Luleå University of Technology, Sweeden, 2005
- Berger, E. J., et al., “Friction Induced Sliding Instability in a Multi Degree of Freedom System with Oscillatory Normal Forces”, Journal of Sound and Vibrations, 266(2), pp. 369-387, 2003
- Mäki Rikard, “New Demands Driving New Technology, A Literature Review of Research into behavior and performance of wet clutches”. Luleå University of Technology, Sweeden
- Cameron, T. M., et al., “ATF Effects on Friction Stability in Slip Controlled Torque Converter Clutches”, SAE Paper No. 2003-01-3255
- Gao, C., et al., “Dynamic Analysis of Stick-slip Motion”, Wear 1994, 173 (1-2), pp 1-12, 1994
- Van De Velde, F., et al., “Stick-Slip with Slip Phase as Starting Point”, Tribo Test 2000. 7(1), pp. 25-35
- Barber J. R., “Frictionally Excited Thermoilastic Instability”, http://www-personal.umich.edu/∼jbarber/TEI.html
- SRC Tech Bulletin 101-02, “Clutch Actuation, Free Play and Wear”, Summers Racing Components, http://www.srcinc.net/html/101-02.html.