ENGINEERING

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

Seung Min Baek1   Wan Soo Kim2   Yeon Soo Kim2,3   Seung Yun Baek1   Nam Gyu Lee2   Seok Pyo Moon2   Hyeon Ho Jeon1   Young Soo Choi4   Taek Jin Kim5,*   Yong-Joo Kim1,2,*   

1Department of Smart Agriculture Systems, Chungnam National University, Daejeon 34134, Korea
2Department of Biosystems Machinery Engineering, Chungnam National University, Daejeon 34134, Korea
3Smart Agricultural Machinery R&D Group, Korea Institute of Industrial Technology (KITECH), Gimje 54325, Korea
4Department of Rural and Biosystems Engineering, Chonnam National University, Gwangju 61186, Korea
5Research and Development Institute, Tongyang Moolsan Co., Ltd., Gongju 32530, Korea

Abstract

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.

Figures & Tables

Fig. 1. Photo of the load measurement tractor used in this study.