Transactions of the Korean Society of Automotive Engineers (한국자동차공학회논문집)

The Korean Society of Automotive Engineers (한국자동차공학회)
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Performance and Transmission Efficiency Analysis of 2-Mode Hydro Mechanical Transmission

2-모드 기계유압식 무단변속기의 성능 및 전달효율해석

  • Jung Gyuhong (Department of Computer Aided Mechanical Design Engineering, Daejin University) ;
  • Kim Hyoungeui (Industrial Technology Department, KIMM) ;
  • Kim Jongki (Industrial Technology Department, KIMM)
  • Published : 2005.01.01
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Abstract

HMT is a type of continuously variable transmission which has split power flow path characteristics with gear train and hydro static unit. The benefit of improved fuel economy and high power capacity enables it to be a promising application fur large vehicles. This paper presents the analysis results including velocity, static torque, transmission efficiency and dynamic model of the HMT that is developed for city buses. The speeds or gear shafts, the static clutch torque and split power ratio for each mode are detailed here. From the analysis of HMT transmission efficiency considering the power loss in meshed gear and hydraulic unit, we can conclude that minimization of hydraulic power is necessary for improved fuel economy design. Also, the dynamic simulation result for mode shift characteristics shows that little shift shock is observed because of the synchronized rotation speed in clutch.

Keywords

References

  1. H. Aitzetmller, 'Steyr S-matic The Future CVT System,' F200A130, FISITA, 2000
  2. K. Kinokami and K. Miki, 'A Development of HMT for Trucks and Buses,' Proceedings of International Congress on Continuously Variable Power Transmission CVT '99, pp.125-135, 1999
  3. W. R. Kelley, 'A CVT for V8 Engine Applications in Passenger Cars and Light Trucks,' Proceedings of International Congress on Continuously Variable Power Transmission CVT '99, pp.117-124, 1999
  4. S. I. Mistry and G. E. Sparks, 'Infinitely Variable Transmission(IVT) of John Deere 7000 TEN Series Tractors,' IMECE Paper 06262002, ASME, 2002
  5. J. Pichard and B. Besson, 'Hydrostatic Power Splitting Transmission Design and Application Examples,' Transactions of ASME, Vol.103, pp.168-173, 1981
  6. D. H. Sung, G. H. Lee, H. E. Kim and H. S. Kim, 'Analysis of Power Characteristics for a Hydro-Mechanical Transmission Considering HSU Flow Loss,' 2001 KSAE Fall Conference Proceeding, pp.1131-1136, 2001
  7. G. H. Jung, H. E. Kim and G. H. Lee, 'Analysis of Hydro Mechanical Transmission for City Buses,' 2004 KSAE Spring Conference Proceeding, pp.623-628, 2004
  8. J. S. Kim, W. Kim, Y. E. Jung, S. B. Jung and H. S. Kim, 'Power Circulation Characteristics of Hydro-Mechanical Transmission System in Steering,' Transactions of KSAE, Vol.5, No.2, pp.13-22, 1997