The domestic 1-ton truck market in Korea is rapidly shifting from diesel vehicles to LPG and electrified vehicles. However, hydraulic special-purpose vehicles, such as aerial work platforms, still require a reliable power take-off system to drive hydraulic equipment. In particular, conventional transmission-mounted PTO systems are difficult to apply to 1-ton LPG automatic-transmission trucks, despite the high market demand for automatic-transmission vehicles. In this study, a PTO system was developed for an aerial work platform based on a 1-ton LPG automatic-transmission truck. The developed system indirectly extracts engine power and transmits it to a hydraulic pump through a magnetic clutch. The hydraulic system was designed based on a flow rate of 20 L/min and a maximum pressure of 200 bar. The generated hydraulic power and required transmission torque were calculated using measured flow rate, pressure, and engine speed. The calculated pump input torque was confirmed to be within the allowable torque capacity of the 15 kgf·m magnetic clutch. The developed PTO-driven hydraulic system was applied to an actual aerial work platform, and the main working motions were confirmed to operate normally.

Abstract
1. 서 론
2. PTO 시스템 설계
    2.1 PTO 시스템 설계
    2.2 유압 동력 설계
3. PTO 시스템 제작 및 구성
4. 시스템 구동평가 및 결과
    4.1 계측 시스템 구성
    4.2 구동평가 및 결과
    4.3 고 찰
5. 결 론
후 기
References

• 장일도(Associate Professor, Dept. of Mechanical Engineering, Wonkwang University) | Il Do Chang Corresponding author
• 이명군(Vice President, K-Top Co., Ltd) | Myung Kun Lee
• 이지윤(K-Top Co., Ltd) | Ji Yoon Lee