[논문]Strength analysis of the driving shift gears for a 67 kW class agricultural tractor according to tire type

Baek, Seung Min; Kim, Wan Soo; Kim, Yeon Soo; Baek, Seung Yun; Lee, Nam Gyu; Moon, Seok Pyo; Jeon, Hyeon Ho; Choi, Young Soo; Kim, Taek Jin; Kim, Yong Joo

doi:10.7744/kjoas.20200096

Strength analysis of the driving shift gears for a 67 kW class agricultural tractor according to tire type 원문보기

Korean journal of agricultural science, v.47 no.4, 2020년, pp.1147 - 1158

Baek, Seung Min (Department of Smart Agriculture Systems, 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 Smart Agriculture Systems, Chungnam National University) , Lee, Nam Gyu (Department of Biosystems Machinery Engineering, Chungnam National University) , Moon, Seok Pyo (Department of Biosystems Machinery Engineering, Chungnam National University) , Jeon, Hyeon Ho (Department of Smart Agriculture Systems, Chungnam National University) , Choi, Young Soo (Department of Rural and Biosystems Engineering, Chonnam National University) , Kim, Taek Jin (Research and Development Institute, Tongyang Moolsan Co., Ltd.) , Kim, Yong Joo (Department of Smart Agriculture Systems, Chungnam National University)

Abstract ▼ AI-Helper

The purpose of this study was to measure the engine torque and rotational speed of a 67 kW class agricultural tractor according to tire type during plow tillage and to analyze the gear strength of the driving shift for the tractor. A field test was performed under the condition with a single tire (Test A) and dual tires (Test B) to increase the ground width of the rear tires. A load monitoring system was developed, and the engine torque and rotational speed were measured using controller area network (CAN) communication. The engine torque and rotational speed during plow tillage were calculated as the equivalent torque and speed using Palmgren Miner's rule. As a result, the equivalent torque and speed in Test A and Test B were 181.0 Nm and 1,913 rpm and 206.1 Nm and 2,130 rpm, respectively. As the ground width of the rear tire was increased, the bending stress in Test B was about 9.9 to 10.5% higher than that of the Test A, and the contact stress was about 4.6 to 4.9% higher than that of the Test A. Under all conditions, the safety factor for the bending and contact stress was 1 or more. Thus, the driving shift gears for the dual tire type are considered safe.

주제어

표/그림 (14)

그림 Fig. 1. Photo of the load measurement tractor used in this study.
그림 Fig. 2. Confguration of the load measurement system used in this study. CAN, controller area network; DAQ, data acquisition.
표 Table 1. Specifications of load measurement tractor used in this study.
표 Table 2. Specifications of DAQ (data acquisition) used in this study.
그림 Fig. 3. Photo of field test according to tire type during plow tillage: (a) Single tire (Test A), (b) dual tire (Test B).
표 Table 3. Specifications of attached implement used in this study.
표 Table 4. Specifications of tire type used in this study.
그림 Fig. 4. Power flow of driving shift for 67 kW class agricultural tractor used in this study. A1, 1st driving gear; A2, 2nd driving gear; A3, 3rd driving gear; A4, 4th driving gear; B1, 1st driven gear; B2, 2nd driven gear; B3, 3rd driven gear; B4, 4th driven gear.
표 Table 5. Specifications of driving shift gear for 67 kW class agricultural tractor used in this study.
그림 Fig. 5. Simulation model of driving shift for 67 kW class agricultural tractor using KISSsoft. A1, 1st driving gear; A2, 2nd driving gear; A3, 3rd driving gear; A4, 4th driving gear; B1, 1st driven gear; B2, 2nd driven gear; B3, 3rd driven gear; B4, 4th driven gear.
그림 Fig. 6. Results of measured engine torque and rotational speed according to tire type during plow tillage: (a) Single tire (Test A), (b) Dual tire (Test B).
그림 Fig. 7. Results of stress for driving shift gears according to tire type during plow tillage: (a) Bending stress, (b) contact stress. A1, 1st driving gear; A2, 2nd driving gear; A3, 3rd driving gear; A4, 4th driving gear; B1, 1st driven gear; B2, 2nd driven gear; B3, 3rd driven gear; B4, 4th driven gear.
표 Table 6. Results of engine torque and rotational speed according to tire type during plow tillage.
그림 Fig. 8. Results of safety factor for driving gears according to tire type during plow tillage: (a) Bending safety factor, (b) contact safety factor. A1, 1st driving gear; A2, 2nd driving gear; A3, 3rd driving gear; A4, 4th driving gear; B1, 1st driven gear; B2, 2nd driven gear; B3, 3rd driven gear; B4, 4th driven gear.

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