Journal of Biosystems Engineering

Korean Society for Agricultural Machinery (한국농업기계학회)
권호 표지
DOI QR코드

DOI QR Code

Characteristic Analysis of Planetary Gear Set of Hydromechanical Transmission System of Agricultural Tractors

  • Park, Young-Jun (Department of System Reliability, Korea Institute of Machinery and Materials) ;
  • Kim, Jeong-Gil (Convergence Components & Agricultural Machinery Group, Korea Institute of Industrial Technology) ;
  • Lee, Geun-Ho (Department of System Reliability, Korea Institute of Machinery and Materials)
  • Received : 2016.06.29
  • Accepted : 2016.08.08
  • Published : 2016.09.01
Download PDF
⟨ Previous Next ⟩

Abstract

Purpose: This study aims to establish the effect of pinhole position errors in the planet carrier of a planetary gear set (PGS) on load sharing among the planet gears in the hydromechanical transmission (HMT) system of an agricultural tractor. Methods: A simulation model of a PGS with five planet gears was developed to analyze load sharing among the planet gears. The simulation model was verified by comparing i ts r esults w ith those of a model developed in a previous s tudy. The verified simulation model was used to analyze the load-sharing characteristics of the planet gears with respect to the pinhole position error and the input torque to the PGS. Results: Both simulation models had identical load magnitude sequences for the five planet gears. However, the load magnitudes on the corresponding planet gears differed between the models because of the different stiffnesses of the PGS components and the input torques to the PGS. The verified simulation model demonstrated that the evenness of load sharing among the planet gears increases with decreasing pinhole position error and increasing input torque. Conclusions: The geometrical tolerance of the pinhole position should be properly considered during the design of the planet carrier to improve the service life of the PGS and load sharing among the planet gears.

Keywords

References

  1. American Gear Manufacturers Association (AGMA). 2006. Design Manual for Enclosed Epicyclic Gear Drives. ANSI/AGMA 6123-B06.
  2. Bodas, A. and A. Kahraman. 2004. Influence of carrier and gear manufacturing errors on the static load sharing behavior of planetary gear sets. JSME International Journal 47(3):908-915. https://doi.org/10.1299/jsmec.47.908
  3. Goering, C. E., M. L. Stone, D. W. Smith and P. K. Turnquist. 2003. Off-road Vehicle Engineering Principles. Miami:The American Society of Agricultural Engineers (ASAE).
  4. Hayashi, T., Y. Li, I. Hayashi, K. Endou and W. Watanabe. 1986. Measurement and some discussions on dynamic load sharing in planetary gears. Bulletin of the JSME 29:2290-2297. https://doi.org/10.1299/jsme1958.29.2290
  5. Hidaka, T., Y. Terauchi and K. Dohi. 1979. On the relation between the run out errors and the motion of the center of sun gear in a Stoeckicht planetary gear. Bulletin of the JSME 22:748-754. https://doi.org/10.1299/jsme1958.22.748
  6. Hidaka, T., Y. Terauchi and K. Nagamura. 1979. Dynamic behavior of planetary gear, 7th report, Influence of the thickness of the ring gear. Bulletin of the JSME 22:1142-1149. https://doi.org/10.1299/jsme1958.22.1142
  7. International Organization for Standardization (ISO). 2003-2007. Calculation of load capacity of spur and helical gears. ISO:6336-(1:6).
  8. Kahraman, A. and S. Vijayakar. 2001. Effect of internal gear flexibility on the quasi-static behavior of a planetary gear set. Transactions of the ASME 123:408-415. https://doi.org/10.1115/1.1371477
  9. Prueter, P. E., R. G. Parker and F. Cunliffe. 2011. A study of gear root strains in a multi-stage planetary wind turbine gear train using a three dimensional finite element/contact mechanics model and experiments. Proceedings of the ASME 2011 International Design Engineering Technical Conferences & Computer and Information in Engineering Conference (IDETC/CIE 2011), Washington, DC, USA.
  10. Park, Y. J., G. H. Lee, J. S. Song and Y. Y. Nam. 2013. Characteristic analysis of wind turbine gearbox considering non-torque loading. Journal of Mechanical Design 135(4):044501-(1:8).
  11. Romax Technology Ltd. 2003. Romax Designer Software Manual. Nottingham, UK.
  12. Singh, A. 2005. Application of a system level model to study the planetary load sharing behavior. Journal of Mechanical Design 127:469-476. https://doi.org/10.1115/1.1864115
  13. Sung, D. H., H. E. Kim, G. H. Lee and H. S. Kim. 2001. Power transmission characteristics of a hydromechanical transmission. Transactions of the Korean Society of Mechanical Engineers A 25(11):1854-1862.

Cited by

  1. Experimental Study on the Carrier Pinhole Position Error Affecting Dynamic Load Sharing of Planetary Gearboxes vol.19, pp.6, 2018, https://doi.org/10.1007/s12541-018-0104-1
  2. Effects of Non-torque Loads and Carrier Pinhole Position Errors on Planet Load Sharing of Wind Turbine Gearbox pp.2198-0810, 2019, https://doi.org/10.1007/s40684-019-00059-8