Design and Performance Verification of Compound CVTs with 2K-H I type Differential Gear

  • Kim Yeon-Su (Small Transit Research Team, Korea Railroad Research Institute) ;
  • Park Jae-Min (School of Mechanical Engineering, Gangwon Human Resources Development Institute) ;
  • Choi Sang-Hoon (School of Mechanical and Aerospace Engineering, Konkuk University)
  • Published : 2006.06.01

Abstract

This paper defined design constraints for the compound CVTs (continuously variable trans-missions) by combining power-circulation-mode CVTs and power-split-mode CVTs, which were proposed for connecting 2K-H I-type differential gear to V-belt-type CVU (Continuously Variable Unit). The design constraints are the necessary and sufficient conditions to avoid geometrical interferences among elements in the compound CVTs, and to guarantee smooth assembly between the power-circulation-mode CVT and power-split-mode CVT Two com-pound CVTs were designed and manufactured in accordance with the design constraints. With these compound CVTs, theoretical analysis and performance experiments were conducted. The results showed that the design constraints were valid and effective design method, and that the designed compound CVTs had the improved performance.

Keywords

References

  1. Beachley, N. H. and Frank, A. A., 1980, 'Principles and Definitions for Continuously Variable Transmissions with Emphasis on Automotive Application,' ASME Paper 80-C2/DET-95
  2. Choi, S. H. and Kim, Y. S., 2000, 'Characteristics on the Output Coupled CYT with Differential Gear,' Journal of the KSPE, Vol. 18, No.3, pp.205-216
  3. Choi, S. H., 2003, 'Performance of CVTs Composed of a Differential Gear Unit and a V-belt Drive,' Journal of the KSPE, Vol. 20, No.2, pp.199-208
  4. Hanachi, S., 1990, 'A Study of the Dynamics of a Split-Torque, Geared-Neutral Transmission Mechanism,' Journal of Mechanical Design, Vol. 112, pp.261-270 https://doi.org/10.1115/1.2912603
  5. Kim, Y. S., Choi, S. U. and Choi, S. H., 2000, 'A Study on the Efficiency Analysis of 2K-H Type Planetary Gear Train,' Journal of the KSPE, Vol. 17, No.3, pp.200-207
  6. Kim, Y. S. and Choi, S. H., 2000, 'Power Flow and Efficiency of Input Coupled type CVT combined Differential Gear Unit,' Journal of the KSPE, Vol. 17, No. 11, pp. 141-150
  7. Kim, Y. S. and Choi, S. H., 2002a, 'Development of CVTs Composed of a 2K-H I Type Differential Gear Unit and a V-belt Drive,' Transactions of the KSME (A), Vol. 26, No.6, pp. 1060-1068 https://doi.org/10.3795/KSME-A.2002.26.6.1060
  8. Kim, Y. S. and Choi, S. H., 2002b, 'Continuously Variable Transmission Composed of a V-belt Drive and a 2K-H II type Differential Gear Unit,' Transactions of the KSME (A), Vol. 26, No.8, pp. 1495-1505 https://doi.org/10.3795/KSME-A.2002.26.8.1459
  9. Kishi, S., Morozumi, M., Furukawa, Y., Misawa, H. and Miyata, H., 1992, 'A Study of a Variable Speed Transmission with a Hypocycloid Type Differential Gearing,' Journal of Japan Automotive technology Association, Vol. 23, No.2, pp. 91-96
  10. Macey, J. P., 1986, 'Geared-Neutral Continuously Variable Transmission,' US Patent No. 4644820
  11. Macmillan, R. H. and Davies, P. B., 1965, 'Analytical Study of Systems for Bifurcated Power Transmission,' Journal of Mechanical Engineering Science, Vol. 7, No.1, pp. 40-47 https://doi.org/10.1243/JMES_JOUR_1965_007_009_02
  12. Morozumi, M., 1989, 'The Theory and Design Method for Planetary Gear Drive and Differential Gear Unit, ' Japan Daily Industrial Paper, Tokyo, pp. 8-31
  13. Morozumi, M., Kishi, S., Furukawa, Y. and Misawa, H., 1992, 'A Study of Variable Speed Transmission with Differential Gear,' Journal of Japan Automotive technology Association, No. 46, pp.45-49
  14. Morozumi, M. and Kishi, S., 1997, 'A Mechanical Consideration on CVT with a Differential Gearing,' Mechanical Researches (Japanese), Vol. 49, No.5, pp. 570-578
  15. Mucino, V. H. and Smith, J. E., 1994, 'Parametric Modeling and Analysis of a Planetary Gear-CVT Mechanism,' SAE Paper 940519
  16. Park, J. M., Kim, Y. S. and Choi, S. H., 2004, 'Performance Analysis of CVTs with a 2K-H II Differential Gear,' Journal of the KSPE, Vol. 21, No.4, pp. 170-178
  17. Roberts, R. W., 1984, 'Continuously Variable Transmission with Synchronous shift,' US Patent No.4589303
  18. White, G., 1967, 'Properties of Differential Transmission,' The Engineer, pp. 105-111
  19. Wahl, R., Long, T., Mucino, V. H. and Smith, J. E., 1993, 'A Model for a Planetary-CVT Mechanism: Analysis and Synthesis,' SAE Paper 930065
  20. Yu, D. and Beachley, N., 1985, 'On the Mechanical Efficiency of Differential Gearing,' ASME Journal of Mechanisms, Transmissions and Automation in Design, Vol. 107, pp.61-67 https://doi.org/10.1115/1.3258696
  21. SAE Recommended Practice, 1994, 'Continuously Variable Transmission Test Code for Passenger Cars,' SAE J1618 AUG94, pp. 29.35-29.40