Load Sharing Behavior of Star Gearing Reducer for Geared Turbofan Engine

• Published in: Chinese journal of mechanical engineering 2017-07, Vol.30 (4), p.796-803
• Main Authors: MO, Shuai, ZHANG, Yidu, WU, Qiong, WANG, Feiming, MATSUMURA, Shigeki, HOUJOH, Haruo
• Format: Article
• Language: English
• Subjects: Coefficient of variation; Design parameters; Electrical Machines and Networks; Electronics and Microelectronics; Engine; Engineering; Engineering Thermodynamics; Error analysis; Gear teeth; Gearboxes; Gears; Heat and Mass Transfer; Instrumentation; Load sharing; Machines; Manufacturing; Mechanical Engineering; Meshing; Original Article; Power Electronics; Processes; Stiffness; Theoretical and Applied Mechanics; Turbofan engines; 分配特性; 星型齿轮传动; 星形; 涡扇发动机; 载荷; 齿轮传动系统; 齿轮减速器
• ISSN: 1000-9345; 2192-8258
• DOI: 10.1007/s10033-017-0096-2

Load sharing behavior is very important for power-split gearing system, star gearing reducer as a new type and special transmission system can be used in many industry fields. However, there is few literature regarding the key multiple-split load sharing issue in main gearbox used in new type geared turbofan engine. Further mechanism anal- ysis are made on load sharing behavior among star gears of star gearing reducer for geared turbofan engine. Compre- hensive meshing error analysis are conducted on eccentricity error, gear thickness error, base pitch error, assembly error, and bearing error of star gearing reducer respectively. Floating meshing error resulting from meshing clearance variation caused by the simultaneous floating of sun gear and annular gear are taken into account. A refined mathematical model for load sharing coefficient calculation is established in consideration of different meshing stiffness and support- ing stiffness for components. The regular curves of load sharing coefficient under the influence of interactions, single action and single variation of various component errors are obtained. The accurate sensitivity of load sharing coefficienttoward different errors is mastered. The load sharing coef- ficient of star gearing reducer is 1.033 and the maximum meshing force in gear tooth is about 3010 N. This paper provides scientific theory evidences for optimal parameter design and proper tolerance distribution in advanced devel- opment and manufacturing process, so as to achieve optimal effects in economy and technology.