Korean Journal of Agricultural Science (농업과학연구)

Institute of Agricultural Science, CNU (충남대학교 농업과학연구소)
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Evaluation of gear reduction ratio for a 1.6 kW multi-purpose agricultural electric vehicle platform based on the workload data

  • Mohammod Ali (Department of Agricultural Machinery Engineering, Graduate School, Chungnam National University) ;
  • Md Rejaul Karim (Department of Agricultural Machinery Engineering, Graduate School, Chungnam National University) ;
  • Habineza Eliezel (Department of Smart Agricultural Systems, Graduate School, Chungnam National University) ;
  • Md Ashrafuzzaman Gulandaz (Department of Smart Agricultural Systems, Graduate School, Chungnam National University) ;
  • Md Razob Ali (Department of Agricultural Machinery Engineering, Graduate School, Chungnam National University) ;
  • Hyun-Seok Lee (SB Industry Co., Ltd.) ;
  • Sun-Ok Chung (Department of Agricultural Machinery Engineering, Graduate School, Chungnam National University) ;
  • Soon Jung Hong (Department of Liberal Arts, Korea National University of Agriculture and Fisheries)
  • Received : 2024.01.03
  • Accepted : 2024.03.31
  • Published : 2024.06.01
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Abstract

Selection of gear reduction ratio is essential for machine design to ensure suitable power and speed during agricultural operations. The goal of the study was to evaluate the gear reduction ratio for a 1.6 kW four-wheel-drive (4WD) multi-purpose agricultural electric vehicle platform using workload data under different off-road conditions. A data acquisition system was fabricated to collect workload (torque) of the vehicle acting on the gear shaft. Field tests were performed under three driving surfaces (asphalt, concrete, and grassland), payload operations (981, 2,942, and 4,903 N), and slope conditions (0 - 4°, 4 - 8°, and 8 - 12°), respectively. Commercial speed reduction gear phases were attached to the input shaft of the vehicle powertrain. The maximum required torque was recorded as 37.5 Nm at a 4,903 N load with 8 - 12° slope levels, and the minimum torque was 12.32 Nm at 0 - 4° slope levels with a 981 Nm load for a 4 km/h speed on asphalt, concrete, and grassland roads. Based on the operating load condition and motor torque and rotational speed (TN) curve, the minimum and maximum gear reduction ratios were chosen as 1 : 50 and 1 : 64, respectively. The selected motor satisfied power requirements by meeting all working torque criteria with the gear reduction ratios. The chosen motor with a gear reduction ratio of 1 : 50 was suitable to fit with the motor T-N curve, and produced the maximum speeds and loads needed for driving and off-road activities. The findings of the study would assist in choosing a suitable gear reduction ratio for electric vehicle multi-purpose field operations.

Keywords

Acknowledgement

This work was supported by Chungnam National University.

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