This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
CFD Simulation of Transmission for Lubrication Oil Flow Validation and Churning Loss Reduction
Technical Paper
2020-01-1089
ISSN: 0148-7191, e-ISSN: 2688-3627
This content contains downloadable datasets
Annotation ability available
Sector:
Language:
English
Abstract
Rapidly changing emission and fuel efficiency regulations are pushing the design optimization boundaries further in the Indian car market which is already a very cost conscious. Fuel economy can be improved by reducing moving parts friction and weight optimization.
Driveline or Transmission power losses are major factor in overall efficiency of rotating parts in a vehicle. Transmission efficiency can be improved by using low viscosity oil, reducing oil quantity and reducing churning losses in car transmission. Changes like low viscosity and reduced oil volume give rise to challenges like compromised lubrication and durability of rotating parts. This further leads to extended design cycles for launching new cars with better transmission efficiency and fuel economy into the market. Design cycle time can be reduced by using CFD simulation for oil flow validation in the early design stage.
CFD simulation of transmission is challenging due to interaction of fluid and multiple gears/shafts rotating at high speed. It is also complex as lubrication is done only by splash generated by gears and oil flow through narrow galleries further complicate the simulation. Current paper describes a CFD simulation method developed for virtual validation of lubrication and oil churning losses using ParticleworksTM software. Simulation model consists of complete transmission system with all the gears rotating, shift system, oil flow galleries and transmission housings. Input conditions to the CFD model are as per the actual test conditions. CFD Simulation model is validated by correlating it with the actual oil flow using transparent housing. Validated model is being used to carry out virtual validation for lubrication system of new design. Improved version of the CFD model is used to calculate the torque loss due to oil churning. Experience of improving oil churning losses using CFD simulation is also presented in the paper. Churning loss improvement is also validated by testing.
Recommended Content
Authors
Topic
Citation
Singh, B., Choudhary, V., Kumar, A., and chopra, C., "CFD Simulation of Transmission for Lubrication Oil Flow Validation and Churning Loss Reduction," SAE Technical Paper 2020-01-1089, 2020, https://doi.org/10.4271/2020-01-1089.Data Sets - Support Documents
| Title | Description | Download |
|---|---|---|
| Unnamed Dataset 1 | ||
| Unnamed Dataset 2 | ||
| Table 3 | ||
| Table 4 | ||
| Unnamed Dataset 5 |
Also In
References
- Moshammer , T. , Mayr , F. , Kargl , K. , and Honeger , C. Simulation of Oil Flow in Gear Box Housing SAE Technical Paper 2006-01-1574 2006 https://doi.org/10.4271/2006-01-1574
- Saegusa , D. and Kawai , S. CFD Analysis of Lubricant Fluid Flow in Automotive Transmission SAE Technical Paper 2014-01-1772 2014 https://doi.org/10.4271/2014-01-1772
- Kodela , C. , Kraetschmer , M. , and Basa , S. Churning Loss Estimation for Manual Transmission Gear Box Using CFD SAE Int. J. Passeng. Cars - Mech. Syst. 8 1 391 397 2015 https://doi.org/10.4271/2015-26-0201
- Peng , Q. , Gui , L. , and Fan , Z. Numerical and Experimental Investigation of Splashing Oil Flow in a Hypoid Gearbox Engineering Applications of Computational Fluid Mechanics 12 1 324 333 2018 10.1080/19942060.2018.1432506
- Andersson , M. 2014