Planetary gear systems, which allow for the use of various gear ratios within a single gear system, are widely used in various industries. This study analyzes the loads of a planetary gear transmission system connected to the load-transporting motor of a crane used in various industries and proposes an optimal design method for the generated loads. This planetary gear system operates at 455 Nm and 3,000 RPM with a gear ratio of 1/3. Hydraulics are used for transmission, and the gear ratios are adjusted according to the crane's application, such as lifting and lowering loads. Basic 3D modeling was performed using the mechanical system design program CATIA. Romax, a gear system analysis program, was used to analyze the loads of the planetary gear system and propose an optimal design method based on theoretical data.

• 곽기명(경상국립대락교 기계항공우주공학부) | Kimyung Kwak
• 오동석(경상국립대락교 기계항공우주공학부) | Dongseok Oh
• 김태현(경상국립대락교 기계항공우주공학부) | Taehyen Kim
• 류성기(경상국립대락교 기계항공우주공학부) | Sungki Lyu Corresponding author
• 강진경(유한 E&S) | Jingyeong Kang