Journal of Drive and Control (드라이브 ㆍ 컨트롤)

The Korean Society for Fluid Power and Construction Equipment (유공압건설기계학회)
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Design of the Hydro-Mechanical Transmission for a 55kW-Class Agricultural Tractor

55kW급 농업용 트랙터 정유압 기계식 변속기 설계

  • Baek, Seung Min (Department of Biosystems Machinery Engineering, Chungnam National University) ;
  • Kim, Wan Soo (Department of Biosystems Machinery Engineering, Chungnam National University) ;
  • Kim, Yeon Soo (Department of Biosystems Machinery Engineering, Chungnam National University) ;
  • Baek, Seung Yun (Department of Biosystems Machinery Engineering, Chungnam National University) ;
  • Kim, Yong Joo (Department of Biosystems Machinery Engineering, Chungnam National University)
  • Received : 2020.04.07
  • Accepted : 2020.05.24
  • Published : 2020.06.01
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Abstract

The purpose of this study was to suggest design criteria for the HMT (hydro-mechanical transmission) of a 55 kW-class agricultural tractor, develop a simulation model, and evaluate its performance such as axle rotational speed, tractor speed, and power transmission efficiency. In this study, the HMT comprised a compound planetary gear and a HSU (hydro-static unit), and the compound planetary gear comprised two planetary gear sets. The HMT has three gear stages, and the maximum tractor speed was selected as 40 km/h. The simulation time was set at 2736 hours considering the lifetime of the tractor, and the simulation was performed for each gear stage at the engine-rated power conditions. As a result of the simulation, the axle rotational speeds for each gear stage were 39, 77, and 158 rpm, respectively. The range of tractor speed for each gear stage were 1.05-10.22 km/h, 10.74-20.17 km/h, and 20.70-41.40 km/h, respectively. The APE (absolute percentage gear) for the tractor's maximum speed between target value and simulation results were 2.20%, 0.85%, and 3.50%, respectively. Also, the power transmission efficiency for each gear stage were 0-75%, 72-81%, and 69-81%, respectively. The simulation results for the power transmission efficiency of the HMT were similar with the results of the previous research. This was a basic study on the development of the HMT for an agricultural tractor. In future studies, it is necessary to develop a tractor platform and evaluate the performance. The comparison between the simulation model and the HMT tractor should be performed.

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