Korean Journal of Agricultural Science (농업과학연구)

Institute of Agricultural Science, CNU (충남대학교 농업과학연구소)
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Analysis of the effects of operating point of tractor engine on fatigue life of PTO gear using simulation

  • Lee, Pa-Ul (Dept. of Biosystems Machinery Engineering, Chungnam National University) ;
  • Chung, Sun-Ok (Dept. of Biosystems Machinery Engineering, Chungnam National University) ;
  • Choi, Chang-Hyun (Dept. of Bio-mechatronic Engineering, Sungkyunkwan University) ;
  • Park, Young-Jun (Korea Institute of Machinery & Materials) ;
  • Kim, Yong-Joo (Dept. of Biosystems Machinery Engineering, Chungnam National University)
  • Received : 2016.06.27
  • Accepted : 2016.07.28
  • Published : 2016.09.30
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Abstract

Agricultural tractors are designed using the empirical method due to the difficulty of measuring precise load cycles under various working conditions and soil types. Especially, directly drives various tractor implements, the power take off (PTO) gear. Therefore, alternative design methods using gear design software are needed for the optimal design of tractors. The objective of this study is to simulate fatigue life of the PTO gear according to the operating point of the tractor engine. The PTO gear was made with SCr415 alloy steel with carburizing and quenching treatments. The fatigue life of the PTO gear was simulated by using bending and contact stress according to the torque of the load levels. The PTO gear simulation was conducted by the KISSsoft commercial software for gear analysis. Bending and contact stress were calculated by the ISO 6336:2006 Method A and B. The simulation of fatigue life was calculated by the Miner's cumulative damage law. The total fatigue life of tractors can be estimated to 3,420 hours; thus, 3,420 hours of fatigue life were used in the simulation of the PTO gear of tractors. The main simulation results showed that the maximum fatigue life of the PTO gear was infinite fatigue life at maximum engine power. Minimum fatigue life of the PTO gear was 19.61 hours at 70% of the maximum engine power. Fatigue life of the PTO gear changed according to load of tractor. Therefore, tractor work data is needed for optimal design of the PTO gear.

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References

  1. Belingardi G, Cuffaro V, Cura F. 2014. Dynamic additional loads influencing the fatigue life of gears in an electric vehicle transmission. Frattura ed Integrità Strutturale 8(30):469-477. https://doi.org/10.3221/IGF-ESIS.30.57
  2. Borner J, Humm K, Joachim F. 2003. Development of conical involute gears (beveloids) for vehicle transmissions. ASME 2003 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference.
  3. Han HS, Lee JK. 2004. Development of a web-based powertrain performance simulation system. Journal of the Korean Society of Precision Engineering 21:100-107. [in Korean]
  4. Han MS, Kim SH, Song HB, Jeon EC. 2009. A study on verification and automatic design program of gears. Journal of the Korean Society of Manufacturing Technology Engineers 368-373. [in Korean]
  5. Han KH, Kim KU, Wu YG. 1999. Severeness of transmission loads of agricultural tractor for rotary operations in poorly drained paddy field. Journal of Biosystems Engineering 24:293-300. [in Korean]
  6. Han LH. 1994. Dynamic analysis of automobile collisions with friction. The Korean Society of Automotive Engineers 2:1-11. [in Korean]
  7. Jeong UG. 2013. Durability verification of gears in the multi-range transmission using cumulative damage rule. Ph.D. dissertation, Gyeongsang National Univ., Jinju, Korean. [in Korean]
  8. Jung JW, Kim KP, Ji HC, Moon TS. 2015. Design improvement of the driving bevel gear in transmissions of a tracked vehicle. Journal of the Korean Society of Manufacturing Process Engineers 14:1-6. [In Korean]
  9. KAMICO (Korea Agricultural Machinery Industry Cooperative) and KSAM (Korean Society for Agricultural Machinery). 2015. Export record of agricultural machinery. [in Korean]
  10. Kim YJ, Chung SO, Choi CH, Lee DH. 2011a. Evaluation of tractor PTO severeness during rotary tillage operation. Journal of Biosystems Engineering 36:163-170. [in Korean] https://doi.org/10.5307/JBE.2011.36.3.163
  11. Kim YJ, Chung SO, Park SJ, Choi CH. 2011b. Analysis of power requirement of agricultural tractor by major field operation. Journal of Biosystems Engineering 36:79-88. [in Korean] https://doi.org/10.5307/JBE.2011.36.2.79
  12. Kim KS, Na SD, Kim BM, Jeong CM, Yoo WS. 2012. Environment of real-time simulation for vehicle dynamic model. Proceedings of the Korean Society of Mechanical Engineers 2012 Winter Conference 36:218-219. [in Korean]
  13. Kim YB, Kim PY, Park JS, Kong CH. 2009. Design optimization of gearbox of CPP system for medium speed diesel engine. Journal of The Korean Society of Mechanical Engineers 1151-1154. [In Korean]
  14. Kim JG, Park YJ, Lee GH, Nam YY, Yang WY. 2014. Optimum design of pitch reducer for wind turbine using genetic algorithm. Journal of the Korean Society of Mechanical Engineers 38:185-192. [In Korean] https://doi.org/10.3795/KSME-A.2014.38.2.185
  15. Lee JS. 2014. An analysis of the load spectrum of 70 kW-class tractor: focused on rotavating and plowing operation in Jeonbuk region. Ph.D. dissertation, Chonbuk National Univ., Jeonju, Korea. [in Korean]
  16. Lee S, Lee DH, Hwang SC, Lee KH. 2012. Stress analysis of helical gear for a railway reducer. Journal of the Korean Society of Manufacturing Process Engineers 11:55-59. [in Korean]
  17. RDA (Rural Development Administration), The department of disaster prevention engineering. 2006. The used agricultural machinery type & Service data. [in Korean]
  18. Standard ISO 6336-1, 2006, Calculation of Load capacity of Spur and Helical Gears, Part 1. International Standard Organization, Geneva.
  19. Standard ISO 6336-2, 2006, Calculation of Load capacity of Spur and Helical Gears, Part 2. International Standard Organization, Geneva.
  20. Standard ISO 6336-3, 2006, Calculation of Load capacity of Spur and Helical Gears, Part 6. International Standard Organization, Geneva.
  21. Zheng CH, Kim KW, Park YI, Lim WS, Cha SW. 2009. A simulation program for HEV performance tests. KSAE (Korea Automobile Manufacturers Association) 2009 Annual Conference. [in Korean]

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