International Journal of Automotive Technology

, Volume 15, Issue 1, pp 145–150 | Cite as

Design of 2-speed transmission for electric commercial vehicle

  • J. W. ShinEmail author
  • J. O. Kim
  • J. Y. Choi
  • S. H. Oh


As environmental and economic interests increase, the need for eco-friendly vehicle such as an electric vehicle (EV) has increased rapidly. Various research of enhancing EV powertrain efficiency and relibility have been studied. In this study, 2-speed shift gears mechanism is designed by using simpson type planetary gear train. This transmission has two planetary gear unit. Gear position is determinded by which ring gear is fixed. Internal components of the transmission are designed for satisfying the required specification of EV. We analyze gear strength, gear mesh efficiency, and transmission efficiency. By manufacturing the transmission prototype and performing some experiments, we verify the application suitability of this transmission.

Key Words

Electric vehicle Transmission Powertrain Planetary gear 



mean diameter of friction plate, (mm)


total torque capacity of all friction plates


torque capacity each friction plate


reduction gear ratio


torque with axial direction, (N.m)


number of friction plates


number of sun gear teeth


number of 1st planet gear teeth


number of 2nd planet gear teeth


number of 1st ring gear teeth


number of 2nd ring gear


friction coefficient of friction plate


angular velocity of sun gear


angular velocity of ring gear


a angular velocity of carrier


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. Bajer, A. and Demkowicz, L. (2002). Dynamic contact/ impact problems, energy conservation, and planetary gear trains, Computer methods in Applied Mechanics and Engineering, 191, 4159–4191.CrossRefzbMATHMathSciNetGoogle Scholar
  2. Del Castillo, J. M. (2002). The analytical expression of the efficiency of planetary gear trains. Mechanism and Machine Theory, 37, 197–214.CrossRefzbMATHGoogle Scholar
  3. Dudley, D. W. (1984). Handbook of Practical Gear Design. McGraw-Hill. New York. 1.27–3.153, 7.1–7.51.Google Scholar
  4. Irimescu, A., Mihon, L. and Padure, G. (2011). Automotive transmission efficiency measurement using a chassis dynamometer. Int. J. Automotive Technology 12,4, 555–559.CrossRefGoogle Scholar
  5. June, A. K. (1995). Planetary gear train dynamics. J. Mechanical Design, Trans. ASME, 116, 241–247.Google Scholar
  6. Kissling, U. and Beermann, S. (2007). Face gears: Geometry and strength. Gear Technology, Jan/Feb, 54–61.Google Scholar
  7. Litvin, F. L. (1994). Gear Geometry and Applied Theory. Prentice-Hall. New Jersey. 1–84, 331–345.Google Scholar
  8. Parker, R. G., Agashe, V. and Vijayakar, S. M. (2000). Dynamic response of a planetary gear system using a finite element/contact mechanics model. J. Mechanical Design, 122, 304–310.CrossRefGoogle Scholar
  9. Strachan, P. J., Reynaud, F. P. and von Backstrom, T. W. (1992). The hydrodynamic modeling of torque converters. N&O Joernaal, Apr, 21–28Google Scholar
  10. Yang, H., Kim, B., Park, Y., Lim, W. and Cha, S. (2009). Analysis of planetary gear hybrid powertrain system part 2: Output split system. Int. J. Automotive Technology 10,3, 381–390.CrossRefGoogle Scholar

Copyright information

© The Korean Society of Automotive Engineers and Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • J. W. Shin
    • 1
    Email author
  • J. O. Kim
    • 2
  • J. Y. Choi
    • 2
  • S. H. Oh
    • 1
  1. 1.Department of Mechanical EngineeringChung-Ang UniversitySeoulKorea
  2. 2.SPG Co., Ltd.IncheonKorea

Personalised recommendations