Korean Journal of Agricultural Science (농업과학연구)

Institute of Agricultural Science, CNU (충남대학교 농업과학연구소)
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Analysis of the load distribution and contact safety factor of PTO gears of a 71 kW class agricultural tractor

  • Baek, Seung-Min (Department of Biosystems Mechanical Engineering, Chungnam National University) ;
  • Kim, Wan-Soo (Department of Biosystems Mechanical Engineering, Chungnam National University) ;
  • Kim, Yeon-Soo (Department of Biosystems Mechanical Engineering, Chungnam National University) ;
  • Lee, Nam-Gyu (Department of Biosystems Mechanical Engineering, Chungnam National University) ;
  • Kim, Nam-Hyeok (Research and Development Institute, Kukje Machinery Co., Ltd.) ;
  • Kim, Yong-Joo (Department of Biosystems Mechanical Engineering, Chungnam National University)
  • Received : 2020.03.18
  • Accepted : 2020.05.15
  • Published : 2020.06.01
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Abstract

The purpose of this study was to analyze the load distribution and contact safety factor for the power take off (PTO) gear of a 71 kW class agricultural tractor. In this study, a simulation model of the PTO gear-train was developed using Romax DESGINER. The face load factor and contact safety factor were calculated using ISO 6336:2006. The simulation time was set at 2,736 hours considering the lifetime of the tractor, and the simulation was performed for each PTO gear stage at the engine rated power conditions. As a result of the simulation, the face load factors for the driving gear at the PTO 1st, 2nd and 3rd stages were 1.644, 1.632, and 1.341, respectively. The contact safety factors for the driving gear at the PTO 1st, 2nd and 3rd stages were 1.185, 1.216, and 1.458, respectively. As the PTO gear stage was increased, the face load factor decreased, and the contact safety factor increased. The load distributions for all the PTO gears were concentrated to the right of the tooth width. This causes stress concentrations and shortens the lifespan of the gears. Therefore, it is necessary to improve the face load factor and the contact safety factor with macro-geometry and micro-geometry.

Keywords

References

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