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Development of Ultra-Low-Friction and Zero-Leakage Mechanical Seal for High-Speed e-Mobility Shaft Sealing Applications
Technical Paper
2020-01-1090
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
By the year 2020, EU legislation limits CO2 emissions for new passenger cars to a maximum of 95 g/km, and further reductions to 68 g/km are expected. An electric motor (e-motor) with high power density often requires shaft cooling in combination with increased rotational speeds to boost efficiency. Especially, low friction and durability of sealing faces are essential to overcome severe friction under high-speed rotation. This challenge can be resolved by using the revolutionary GlideXTM sealing technologies, featuring advanced surface-texturing that enables microscopic flow control in dynamic sealing faces. The surface-textured mechanical seal can reduce leakage to the level of insignificance and up to 90% less friction, compared to a non-textured seal. The advanced texturing produces a thin liquid-sealing film between sealing faces, and liquid-lubrication becomes dominant at low speeds; at high speeds, gas-lubrication becomes dominant by manipulating liquid ingress into sliding surfaces. As a result, the textured seal can maintain low friction even at very high-speed rotations, taking advantage of air as less viscous lubricant. Low friction promotes less wear, more service life, and less power/fuel consumption. Less power consumption helps higher battery range; lower friction leads to a reduction in CO2 emissions compared to ICE (Internal Combustion Engine) and hybrid vehicles. The proposed sealing technologies can be used for applications like ORC (Organic Rankine Cycle) compressors, water pumps, e-motor shaft cooling, reduction gear sealing, fuel cell compressors, and more. Herein, development of ultra-low-friction and zero-leakage mechanical seal for high-speed e-motor shaft is explained. Both numerical calculations and experiments are performed to confirm fluid film thickness, friction coefficient, and amount of leakage. Furthermore, application examples for e-motor shaft cooling system, reduction gearbox, and electric water pumps are introduced.
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Tokunaga, Y., Nakahara, N., and Itadani, M., "Development of Ultra-Low-Friction and Zero-Leakage Mechanical Seal for High-Speed e-Mobility Shaft Sealing Applications," SAE Technical Paper 2020-01-1090, 2020, https://doi.org/10.4271/2020-01-1090.Data Sets - Support Documents
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References
- Tokunaga , Y. , Inoue , H. , Okada , K. , Uemura , N. et al. Improvement in Sealing Performance and Friction Reduction by Laser Surface Texturing for Mechanical Seal Proc. 21th Int. Conf. Fluid Sealing 2011 91 102
- Kimura , W. , Katori , H. , Dircks , R. , and Takigahira , Y. Realization of Ultra-High Speed, Zero-Leakage and Low-Friction Textured Mechanical Seals by Combining Liquid and Gas Lubrications - Gas Liquid Hybrid Face Proc. 20th ISC - International Sealing Conference Stuttgart 2018
- Dircks , R. , Huppertz , H. , Itadani , M. , and Okada , T. GlideX™ - Frictionless Sealing Solutions for Electric Drives Antriebstechnischen Kolloquium (ATK) 2019
- Lai , T. Development of Non-Contacting, Non-Leaking Spiral Groove Liquid Face Seals J. Society of Tribol. And Lub. Eng. 50 8 625 1994
- Mammadov , V.A. , Yusifov , A. , and Tacon , K.P. Upstream Pumping Technology in Centrifugal Pump Mechanical Sealing Applications ― Field Experience with High Duty Sea Water Injection Pumps Proc. The 26th Int. Pump Users Symp 2010 27
- Bondarchuk , P. and Falaleev , S. Direction of Improvement of the Radial-Face Seals of Rotor Supports of the Aircraft Engines Int. J. Eng. and Tech.(IJET) 6 5 2261 2014
- Simon , C. , Lang , K. , Feigl , P. , and Bock , E. Turbocharger Seal for Zero Oil Consumption and Minimised Blow-By MTZ Worldwide 71 4 36 2010
- Neuberger , S. and Bock , E. Gas-Lubricated Mechanical Face Seals Reduce CO2 Emissions Sealing Technology Sep. 2014 ISSN 1350-4789
- Dirks , R. , Driessen , P. , and Katori , H. GlideX™ - Revolutionary Dynamic Sealing Technology for (Electric) Turbo-Chargers Proc. The 22nd Supercharging Conference September 2017
- Elrod , H.G. A Cavitation Algorithm ASME J. Lubr. Technol. 103 3 350 354 1981
- Tokunaga , Y. , Inoue , H. , and Sugimura , J. Multi-Objective Design Optimization for Zero-Leakage and Low-Friction Mechanical Seals with Texturing Surface Proc. World Tribol. Congress Sept. 2017