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Sensitivity Analysis and Experimental Verification of Automotive Transmission Gearbox Synchronizer Gear Shift Quality
Technical Paper
2020-28-0386
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Synchronizer is the key element for the smoother gear shift operation in the constant mesh transmission. In the gear shift operation, the double bump occurs at the contact between the sleeve teeth and the clutch body ring teeth after the full synchronization. The double bump is random in nature and the dynamics is difficult to predict. The double bump gives a reaction force to the driver and affects the gear shift quality. This paper focus on the sensitivity analysis of the synchronizer ring index percentage and the clutch body ring asymmetric chamfer angle to reduce the occurrence and magnitude of the double bump.
The system level simulation model is developed using 1D simulation tool. The modeling is done after complete declutching event so that there is no power supply to the transmission. The model can handle both upstream and downstream reflected inertia depending upon the gear shift event. The eight phases of gear shifting event such as first free flight, pre-synchronization, indexing of synchronizer ring, full synchronization, turning of synchronizer ring, second free flight, indexing of clutch body ring and complete engagement are included in the simulation model.
The simulation results have good correlation with the actual test data. The sensitivity analysis gives the optimal solution for the synchronizer parameters. The optimal values are validated on the test rig and vehicle for the improved gear shift quality.
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K, B., THANAPATI, A., and Yadav, V., "Sensitivity Analysis and Experimental Verification of Automotive Transmission Gearbox Synchronizer Gear Shift Quality," SAE Technical Paper 2020-28-0386, 2020, https://doi.org/10.4271/2020-28-0386.Data Sets - Support Documents
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References
- Socin , R.J. , and Walters , L.K. Manual Transmission Synchronizers SAE Technical Paper 680008 1968 https://doi.org/10.4271/680008
- Lovas , L. , Play , D. , Márialigeti , J. , and Rigal , J.F. Mechanical Behaviour Simulation for Synchromesh Mechanism Improvements Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 220 7 919 945 2006
- Bedmar , A.P. 2013
- Hoshino , H. Analysis on Synchronization Mechanism of Transmission SAE Technical Paper 1999-01-0734 1999 https://doi.org/10.4271/1999-01-0734
- Kelly , D. and Kent , C. Gear Shift Quality Improvement in Manual Transmissions Using Dynamic Modeling FISITA World Automotive Congress Seoul, Korea 2000
- Kim , E. , Sung , D. , Seok , C. , Kim , H. et al. Development of Shift Feeling Simulator for a Manual Transmission SAE Technical Paper 2002-01-2202 2002 https://doi.org/10.4271/2002-01-2202
- Li , J. , Luo , F. , Luo , Y. , Zhang , Y. et al. Sensitivity Analysis on a Synchronization Mechanism for Manual Transmission Gearbox SAE Technical Paper 2014-01-1768 2014 https://doi.org/10.4271/2014-01-1768
- Bannur , S.M. , and Deshmukh , P.N. Assess, Analyse and Improve Shift Quality of Five Speed Automated Manual Transmission for LCV International Journal of Innovative Research in Science, Engineering and Technology 5 6 June 2016
- Kumar , T.M. , D’mello , S. , and Pattabiraman , V. Optimization of Synchronizer of a Typical 5-Speed Manual Shift Synchromesh Transmission Using Statistics-Based Simulation Techniques SAE Technical Paper 2006-32-0069 2006 https://doi.org/10.4271/2006-32-0069
- https://www.fzg.mw.tum.de/en/research/components/synchronizers/