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Design Methodology for a Compact Dual Clutch Transmission (DCT)
Technical Paper
2009-01-0511
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
The gear train architecture utilized in DCT is the same parallel shaft arrangement as the conventional manual transmission with synchronizers for smooth gear transition, and enjoys the efficiency much higher than automatic transmission with torque converter.
Conventional geartrain arrangement for a 6, 7, or 8-speed DCT makes the overall transmission length unmanageable for packaging in a vehicle. Dependency, which allows two output gears to share one input gear, can be employed to reduce the overall length of the transmission.
The dependencies present challenges to accurately determine the interrelating parameters such as center distances, speed gear and final drive ratios and pitch diameters, etc.
Mathematical algorithms and nomograms have been developed to demonstrate interrelationship of the key parameters. Overall top gear and low gear ratios and ratio spread have been computed for a given application using engine torque and power signature that satisfy the acceleration, gradability, and top speed requirements. The intermediate ratios subsequently have been determined by employing mathematical technique to achieve uniformly, progressively smaller ratios steps. The mathematical algorithms developed for single or double dependency have been applied to iteratively calculate pitch diameters of common input gear and the two sharing output gears as well as the center distances of the two output shafts to the input shaft. Finally, number of teeth for the dependency gearsets has been determined by applying continued fraction method.
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Authors
Topic
Citation
Razzacki, S., "Design Methodology for a Compact Dual Clutch Transmission (DCT)," SAE Technical Paper 2009-01-0511, 2009, https://doi.org/10.4271/2009-01-0511.Also In
References
- Hardy G. H. Wright E. M. “An Introduction to the Theory of Numbers” Oxford University Press London 1945
- Razzacki S. T. “Design and Application of Manual Transmission for Improved Fuel Economy and Efficiency” GPC 2001
- Razzacki S. T. “Layshaft Transmission Gear Ratio Selection” GPC 2002