Browse > Article

Performance and Transmission Efficiency Analysis of 2-Mode Hydro Mechanical Transmission  

Jung Gyuhong (Department of Computer Aided Mechanical Design Engineering, Daejin University)
Kim Hyoungeui (Industrial Technology Department, KIMM)
Kim Jongki (Industrial Technology Department, KIMM)
Publication Information
Transactions of the Korean Society of Automotive Engineers / v.13, no.1, 2005 , pp. 90-98 More about this Journal
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
HMT; Hydro static unit; Mode shift; Transmission efficiency; Synchronous shift;
Citations & Related Records
연도 인용수 순위
  • Reference
1 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
2 S. I. Mistry and G. E. Sparks, 'Infinitely Variable Transmission(IVT) of John Deere 7000 TEN Series Tractors,' IMECE Paper 06262002, ASME, 2002
3 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
4 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
5 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
6 J. Pichard and B. Besson, 'Hydrostatic Power Splitting Transmission Design and Application Examples,' Transactions of ASME, Vol.103, pp.168-173, 1981
7 H. Aitzetmller, 'Steyr S-matic The Future CVT System,' F200A130, FISITA, 2000
8 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