Journal of the Korean Society of Manufacturing Process Engineers (한국기계가공학회지)

The Korean Society of Manufacturing Process Engineers (한국기계가공학회)
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Efficiency Improvement of Transfer Drive Gear Bearings for an Automotive Automatic Transmission

승용차 자동변속기용 트랜스퍼 드라이브 기어 베어링의 효율개선 방법에 관한 연구

  • 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)
  • 이인욱 ((유) 셰플러코리아) ;
  • 한성길 (경상대학교 대학원 기계설계학과) ;
  • 곽범섭 (경상대학교 대학원 기계설계학과) ;
  • 이호성 (경상대학교 기계융합공학과) ;
  • 송철기 (경상대학교 기계공학부)
  • Received : 2020.11.13
  • Accepted : 2020.12.12
  • Published : 2021.03.31
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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.

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References

  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. https://doi.org/10.7467/KSAE.2018.26.1.120
  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. https://doi.org/10.9725/kstle.2015.31.6.281
  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.