This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Modelling of Power Losses of Transmission Synchronizers in Neutral Position
Technical Paper
2018-01-1228
ISSN: 0148-7191, e-ISSN: 2688-3627
This content contains downloadable datasets
Annotation ability available
Sector:
Language:
English
Abstract
Developing an energy-efficient powertrain system is a solution for environment-friendly vehicles. Furthermore, it also enhances the performance of vehicles. In powertrain system, transmission plays an important role in terms of vehicle dynamic performance and energy consumption. Therefore, a lot of researches have been conducted on modelling power losses inside the transmission. Basically, the power losses in transmission consist of bearing losses, drag torque losses on gear blank that is immersed in the oil and gear mesh losses due to the sliding frictional force on gear flank. According to some experiments in the latest literatures, power losses of synchronizers cannot be neglected, when its shift sleeve is in neutral position. Principally, power losses of synchronizers in neutral position mainly come from load independent drag torque. The drag torque is generated by the shear torque of lubrication in the gap (or gaps) between synchronizer ring and synchronizer cone, which are rotating at different speed. In this paper, a drag torque model of synchronizer units in neutral position is built up based on mechanism of tribology lubrication. Several factors are considered in the model, for example, synchronizer geometry (cone angle, face width, etc.) and lubrication factors (viscosity, oil volume, etc.). Furthermore, the power losses of synchronizer under different oil injection methods are considered and separately discussed in the paper. In the end, validations are conducted. The amplitude and tendency of simulation results agree well with test data. In the future, the model of synchronizer power losses in neutral position will be further modified and it is planned to apply it into a study case for a manual transmission.
Recommended Content
Authors
Topic
Citation
Shen, Y., Liu, Z., and Rinderknecht, S., "Modelling of Power Losses of Transmission Synchronizers in Neutral Position," SAE Technical Paper 2018-01-1228, 2018, https://doi.org/10.4271/2018-01-1228.Data Sets - Support Documents
Title | Description | Download |
---|---|---|
Unnamed Dataset 1 |
Also In
References
- Tulpule , P. , V. Marano , and G. Rizzoni Effects of Different PHEV Control Strategies on Vehicle Performance American Control Conference, 2009. ACC'09 2009
- Niemann , G. and H. Winter Maschinenelemente: Band 2: Getriebe allgemein, Zahnradgetriebe-Grundlagen Stirnradgetriebe 2013 Springer-Verlag
- Petry-Johnson , T.T. et al. An Experimental Investigation of Spur Gear Efficiency Journal of Mechanical Design 130 6 062601 2008
- Seetharaman , S. et al. Oil Churning Power Losses of a Gear Pair: Experiments and Model Validation Journal of Tribology-Transactions of the Asme 131 2 022202 2009
- GmbH , S. SKF-Hauptkatalog: das Wälzlager-Handbuch für Studenten 2004
- ” 2001
- Iwata , T. et al. 2016 10.4271/2016-01-1172
- Wirth , M.A. Schleppmomente in Synchronisierungen von Fahrzeuggetrieben,” 2012
- Aphale , C.R. et al. Modeling and Parametric Study of Torque in Open Clutch Plates Journal of Tribology 128 2 422 430 2005
- Iqbal , S. , et al. Mathematical Model and Experimental Evaluation of Drag Torque in Disengaged Wet Clutches ,” ISRN Tribology 2013
- Yuan , Y. et al. An Improved Hydrodynamic Model for Open Wet Transmission Clutches Journal of Fluids Engineering 129 3 333 337 2007
- KG , I.-S. Zwischenringe für Mehrkonus-Synchronisationen ,” 2002
- Erdmann , D.-I.K. Einflussfaktoren auf die Leistungsfähigkeit von Mehrfachsynchronisierungen ,” 2008
- Racina , A. Vermischung in Taylor-Couette Strömung,” 2008
- Shihua , H.J.P.Z.Y. Drag Torque Prediction Model for the Wet Clutches Chinese Journal of Mechanical Engineering 22 2 1 2009
- Panton , R.L. Incompressible Flow 4th 2013 John Wiley & Sons, Inc
- Schlichting , H. , et al. Boundary-layer theory 1955 Springer
- Iqbal , S. et al. Model for Predicting Drag Torque in Open Multi-disks Wet Clutches Journal of Fluids Engineering 136 2 021103 2014
- Wirth , M. Synchro-Schleppmomente ,” 2011 575