On the systematic design of planetary gear trains with high reduction ratio

• Main Authors: Tsung-Well Wu, 吳宗蔚
• Other Authors: Lung-Chang Hsieh
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/sk3t7z

碩士 === 國立虎尾科技大學 === 機械與機電工程研究所 === 96 === Gear reducers are mechanical devices for transferring power to do works. Due to their characteristics of lower output speed and higher output torque than input shaft, they are often used with engines or motors and wildly used in automated production equipment, transmission systems, machine tools, electric vehicles, electric hand tools, and other needs of high-torque low-speed applications. Due to the reasons of compact size, lightweight, and multi-degrees of freedom, high load capacity, high reduction ratio, planetary gear trains are commonly used in various transmissions(Such as multi-speed gear box, automotive transmissions, and gear differentials, etc.). Due to above reasons, planetary gear trains can be used as the transmission systems with high reduction ratio for power machinery. The purpose of this paper is to propose a systematic approach for designing planetary gear trains with high reduction ratio. First, according to the train value equation and coupling theorem of planetary gear trains, we derive the reduction ratio equations for all possible coupling cases. Then, based on these reduction ratio equations, we accomplish the kinematic design of planetary gear trains with high reduction ratio and get three planetary gear trains with high reduction ratio. According to the latent power theorem, we do analyze the mechanical efficiencies of these planetary gear trains with high reduction ratio. Finally, the prototypes of planetary gear trains with high reduction ratio are produced include one machined mockup and two rapid prototypes.