Improvement of Gear Durability for an 86 kW Class Agricultural Tractor Transmission by Material Selection

Seung-Min Baek, Seung-Yun Baek, Hyeon-Ho Jeon, Wan-Soo Kim, Yeon-Soo Kim, Nam-Hyeok Kim, Taeyong Sim, Hyunggun Kim and Yong-Joo Kim
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Seung-Min Baek: Department of Smart Agriculture Systems, Chungnam National University, Daejeon 34134, Korea
Seung-Yun Baek: Department of Smart Agriculture Systems, Chungnam National University, Daejeon 34134, Korea
Hyeon-Ho Jeon: Department of Smart Agriculture Systems, Chungnam National University, Daejeon 34134, Korea
Wan-Soo Kim: Department of Biosystems Machinery Engineering, Chungnam National University, Daejeon 34134, Korea
Yeon-Soo Kim: Smart Agricultural R&D Group, Korea Institute of Industrial Technology (KITECH), Gimje 54325, Korea
Nam-Hyeok Kim: Research and Development Institute, Kukje Machinery Co., Ltd., Cheongju 29036, Korea
Taeyong Sim: Department of Artificial Intelligence, Sejong University, Seoul 05006, Korea
Hyunggun Kim: Department of Biomechatronic Engineering, Sungkyunkwan University, Suwon 16419, Korea
Yong-Joo Kim: Department of Smart Agriculture Systems, Chungnam National University, Daejeon 34134, Korea

Agriculture, 2022, vol. 12, issue 2, 1-16

Abstract: This study was conducted to ensure gear durability and design optimal transmission of agricultural tractors. A field test was conducted using an 86 kW agricultural tractor for plow and rotary tillage, which are typical agricultural operations. The field test was completed after about 107 h due to transmission noise and operational problems. As a result of disassembling the transmission, it was found that the range shift A and B gears were damaged. In the case of the range shift A gear, it was judged that plastic deformation occurred due to low contact stress, and the bending stress was low, therefore gear tooth breakage occurred in the range shift B gear. In order to ensure the durability of the transmission, four materials of alloy steel for machine structural use, such as SCr420, SNCM220, SCM822, and SNC815, were selected, and the safety factor and service life according to the gear materials were compared using simulation software. As a result of simulation analysis, SCM822 satisfied the target life value and was selected as a material for change. The damaged range shift A and B gears were changed to SCM822, and an axle dynamometer test was performed for the verification of the modified transmission. After conducting the axle dynamometer test, the transmission was disassembled, and it was confirmed that the range shift A and B gears were in normal condition. Therefore, it was considered that the durability of the transmission was ensured by satisfying the target life requirements of the gears. In the future, the transmission simulation model for 86 kW class agricultural tractor is expected to be utilized for the development of tractor transmissions, cost reduction, and optimal design.

Keywords: agricultural tractor; transmission; gear; material; strength; life (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2022
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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