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Performance Evaluation of a Driving Power Transmission System for 50 kW Narrow Tractors

  • Hong, Soon-Jung (Rural Human Resource Development Center, Rural Development Administration) ;
  • Ha, Jong-Kyou (Tractor R&D (Center), LS Mtron Ltd.) ;
  • Kim, Yong-Joo (Department of Biosystems Machinery Engineering, College of Agricultural and Life Sciences, Chungnam National University) ;
  • Kabir, Md. Shaha Nur (Department of Agricultural and Industrial Engineering, Faculty of Engineering, Hajee Mohammad Danesh Science and Technology University) ;
  • Seo, Young Woo (Department of Biosystems Machinery Engineering, College of Agricultural and Life Sciences, Chungnam National University) ;
  • Chung, Sun-Ok (Department of Biosystems Machinery Engineering, College of Agricultural and Life Sciences, Chungnam National University)
  • Received : 2018.02.07
  • Accepted : 2018.02.25
  • Published : 2018.03.01

Abstract

Purpose: The development of compact tractors that can be used in dry fields, greenhouses, and orchards for pest control, weeding, transportation, and harvesting is necessary. The development and performance evaluation of power transmission units are very important when it comes to tractor development. This study evaluates the performance of a driving power transmission unit of a 50 kW multi-purpose narrow tractor. Methods: The performance of the transmission and forward-reverse clutch, which are the main components of the driving power transmission unit of multi-purpose narrow tractors, was evaluated herein. The transmission performance was evaluated in terms of power transmission efficiency, noise, and axle load, while the forward-reverse clutch performance was evaluated in terms of durability. The transmission's power transmission efficiency accounts for the measurement of transmission losses, which occur in the transmission's gear, bearing, and oil seal. The motor's power was input in the transmission's input shaft. The rotational speed and torque were measured in the final output shaft. The noise was measured at each speed level after installing a microphone on the left, right, and upper sides. The axle load test was performed through a continuous equilibrium load test, in which a constant load was continuously applied. The forward-reverse clutch performance was calculated using the engine torque to axle torque ratio with the assembled engine and transmission. Results: The loss of power in the transmission efficiency test of the driving power unit was 6.0-9.7 kW based on all gear steps. This loss of horsepower was equal to 11-18% of the input power (52 kW). The transmission efficiency of the driving power unit was 81.5-89.0%. The noise of the driving power unit was 50-57 dB at 800 rpm, 70-77 dB at 1600 rpm, and 76-83 dB at 2400 rpm. The axle load test verified that the input torque and axle revolutions were constant. The results of the forward-reverse clutch performance test revealed that hydraulic pressure and torque changes were stably maintained when moving forward or backward, and its operation met the hydraulic design standards. Conclusions: When comprehensively examined, these research results were similar to the main driving power transmission systems from USA and Japan in terms of performance. Based on these results, tractor prototypes are expected to be created and supplied to farmhouses after going through sufficient in-situ adaptability tests.

Acknowledgement

Grant : Development of Gathering Type Potato Harvester

Supported by : Rural Development Administration

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