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Low-Height Differential Concepts for EVs
Technical Paper
2018-01-1294
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Compared to the internal-combustion-engine (ICE) vehicles on the road today, Electric Vehicles (EV) deliver more torque to vehicle wheels, and require smaller driveline packaging envelopes. Current differentials use asymmetrical ring gears with differential housings that are roughly a third of the tire outside diameter. New differential architecture concepts are shown here to deliver more torque to the wheels, while decreasing the height of the differential as much as fourfold. Most EV’s are driven by one or more torsion motors, delivering torque to the left side and the right side of the EV’s at different speeds during a vehicle turn, or a wheel “spinout.” At low speeds, the EV motors deliver more torque to the wheels than comparably sized ICE vehicles, so EV differentials must be built stronger and stiffer to manage the distribution of available drive torque. But, less space is available within EV’s as battery space is added while passenger and cabin space is expanded, leaving a smaller envelope for the driveline in competitive models. New concepts that reduce the vertical envelope by seventy-five percent are depicted here, with analysis of the methods of higher torque in a smaller package. Novel methods with smaller ring gears, internal cases, reduction of residual loading, and redistribution of components are depicted, explained, and justified for size, torque, shape, and mass. The open space necessary for additional componentry such as limited slip or lock-up are shown, so the EV driveline can be optimized for cabin space, road clearance, aerodynamics, and energy efficiency. Although these architectures focus on EV applications, they can be used for retrofit into ICE pass-car, light truck, and heavy truck vehicles.
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Fritz, P., "Low-Height Differential Concepts for EVs," SAE Technical Paper 2018-01-1294, 2018, https://doi.org/10.4271/2018-01-1294.Data Sets - Support Documents
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References
- Anand , A. , and Konka , H. , and Fritz , P. Light Weight Structures - Structural Analysis for Weight Optimization and Joining Techniques of Dissimilar Materials SAE Technical Paper 2016-01-1394 2016 10.4271/2016-01-1394
- Fritz , P. , Mapkar , J. , and Williams , K. Metal-To-Composite Structural Joining for Drivetrain Applications http://www.nasampe.org/page/searchengine#home/technicalpaperdetails/57aa64407d12ebee580e8aad 2016 May
- Fritz , P. , Cloud , G. Patterson , E. , and Backman , D. Joining Technologies for Composites and Dissimilar Materials Proceedings of the 2016 Annual Conference on Experimental and Applied Mechanics, Society for Experimental Mechanics Series 1st 107 114
- Fritz , P. On Improvements in Differential Power Flow Architectures for Increased Efficiency th http://www.transmission-symposium.com/usa/on-improvements-in-differential-power-flow-architectures-for-increased-efficiency 2017
- Fritz , P. A System Evaluation of Rotational Inertia for Lightweighting in Driveline Components http://www.euroforum.de/veranstaltung/pdf/p2300447en.pdf th 2017
- Cole , J. , and Loveday , E. Monthly Plug-In EVs Scorecard Inside EVs https://insideevs.com/monthly-plug-in-sales-scorecard 2017
- Brown , D. Next EV Revolution-think Trucks and Buses Energy Post Weekly http://energypost.eu/next-ev-revolution-think-trucks-buses 2017
- Masson , L. The Pros and Cons of Using In-Wheel Motors in Electric Cars http://www.plugincars.com/pros-and-cons-wheel-motors-127174.html 2013
- Al Emran Hasan , M.M. , Motamed Ektesabi , M. , and Kapoor , A. An Investigation into Differential Torque Based Strategies for Electronic Stability Control in an In-Wheel Electric Vehicle International Journal of Engineering and Innovative Technology (IJEIT) 2 7 2013
- Learn More about DC Motors http://www.globalspec.com/learnmore/motion_controls/motors/dc_motors 15 20 2012-2017