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http://dx.doi.org/10.14775/ksmpe.2021.20.03.040

Efficiency Improvement of Transfer Drive Gear Bearings for an Automotive Automatic Transmission  

Lee, In Wook (Schaeffler Korea Corporation)
Han, Sung Gil (Depart. of Mechanical Engineering, Gyeongsang National University)
Gwak, Beom-Seop (Depart. of Mechanical Engineering, Gyeongsang National University)
Lee, Ho Sung (Depart. of Mechanical Convergence Engineering, Gyeongsang National University)
Song, Chul Ki (School of Mechanical Engineering, Engineering Research Institute, Gyeongsang National University)
Publication Information
Journal of the Korean Society of Manufacturing Process Engineers / v.20, no.3, 2021 , pp. 40-46 More about this Journal
Abstract
An automatic transmission of automobiles enables comfortable driving experience with lower transmission shifting jerks. However, the assembly structure is more complicated and requires additional components with lower efficiency than the manual transmission system. Extensive research has been conducted to improve the overall transmission efficiency by optimizing each component of the automatic transmission assembly. This study focuses on enhancing the friction torque of double angular contact ball bearings used in automatic transmission. The friction torque of the bearing varies with the operating conditions such as the operational load and rotating speed. Since reducing the friction torque of the bearing tends to deteriorate the durability of the bearing, it is necessary to design the bearing having a minimum required friction torque by determining the durability life of an automatic transmission assembly, In this study, the theoretical life and friction torque of conventional and newly-developed bearings are calculated. The difference in the friction torque between the new and existing bearings are also evaluated.
Keywords
Automatic Transmission; Angular Contact Ball Bearing; Transmission Efficiency; Bearing Frictional Power Losses; Bearing Rating Life;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
1 Jung, H. J., and Lee, S. H., "Technical Trends for the Bearing of Automotive Transmissions/Transaxles," Journal of the Korean Society of Automotive Engineers, Vol. 38, No. 8, pp. 24-27, 2016.
2 Park, K. J., Kang, M. R., Lee, S. H., Son, W. C., Kwon Y. H., and Kahraman, A., "Prediction of Mechanical and Spin Power Losses of a Parallel-Axis Geartrain in an Automobile Transmission," The Korean Society of Automotive Engineers, Vol. 26, No. 1, pp. 120-130, 2018.   DOI
3 Gwak, D. W., "Study on the Effects of Bearing Type and Operating conditions on Drag Torque in Automobile Transmission," a master's thesis, Hannam University, 2017.
4 "Gasoline 6 speed automatic transmission,"(2012) https://www.hyundainews.com(accessed 23, Nov., 2020)
5 Baek, H. Y., Pyun, J. M., Lee, D. Y., and Park, T. J., "Improving the Endurance Life of Deep Groove Ball Bearings for Automotive Transmission," The Korean Society of Tribologists and Lubrication Engineers, Vol. 31, No. 6, pp. 281-286, 2015.   DOI
6 Lee, I. W., Han, S. K., Shin, Y. I., and Song, C. K., "A Study on Efficiency of Tapered Roller Bearing for an Automatic Transmission," The Korean Society of Manufacturing Process Engineers, Vol. 17, No. 5, pp. 30-36, 2018.