Analytical investigation on load sharing characteristics of herringbone planetary gear train with flexible support and floating sun gear

• Published in: Mechanism and machine theory 2020-02, Vol.144, p.103670, Article 103670
• Main Authors: Shuai, Mo, Ting, Zhang, Guo-guang, Jin, Xiao-lin, Cao, Han-jun, Gao
• Format: Article
• Language: English
• Subjects: Flexible support; Floating sun gear; Herringbone planetary gear train; Load sharing characteristic; Natural characteristic
• ISSN: 0094-114X; 1873-3999
• DOI: 10.1016/j.mechmachtheory.2019.103670

Established a dynamic model for HPGT with flexible support and floating sun gear.Researched the natural characteristics of HPGT.Studied the load sharing characteristic of flexible support when sun gear is floating.Studied the load sharing characteristic of flexible support when sun gear is normally supported.Compared the load sharing characteristic under these two conditions. As an important part of reducers, herringbone planetary gear train (HPGT) has the advantages of small size, small mass, large transmission ratio, compact structure and strong carrying capacity. It has wide applications in the transmission fields such as aviation and ships. The flexible support stiffness and the floating components are largely influencing the load sharing characteristic, which is a key indicator to evaluate the bearing stability and reliability of planet gears. Therefore, it is necessary to study the influence mechanism of flexible support on the load sharing characteristic with floating sun gear. Based on the centralized parameters theory and the Lagrange method, a dynamic model for HPGT is established. At the same time, based on this model, natural characteristic is also researched. Particularly, the dynamic curves are expressed in a form of polar coordinate system, which can make the curves clearly show the changing law of dynamic characteristics. As shown in the studied results, when the sun gear is normally supported and the sun gear is floating, the natural frequency of the HPGT is calculated, and the influence mechanism of the flexible support on the load sharing characteristics is studied. In addition, the difference in load sharing characteristic is compared.