Study on Unbalanced Meshing Loads of Planetary Gear Transmission under Heavy-load Conditions

doi:10.3969/j.issn.1004-132X.2023.13.001

Abstract

Abstract: To study the gear tooth load distribution affected by the multi-flexible body deformations of planetary gear transmission under heavy-load conditions， a coupled dynamics modeling method of planetary gear transmission that taken into account the structural flexibility and dynamic contact of gear pair was proposed. Taking a certain type of megawatt-class wind turbine gearbox planetary gear train as the research object， according to the ring gear， carrier， and their boundary characteristics， the finite element reduction theory was used to establish the correlations between the ring gear teeth， carriers coupling points and the corresponding elastic supports， and the dynamic load-contact of the gear pair was used as the interface coordination condition to couple these components， to establish the planetary gear transmission coupling dynamics model. The phenomenon of unbalanced meshing loads and the effects of structural parameters on the meshing characteristics were analyzed. The results show that the comprehensive bending moment acting on the planet gear and the asymmetric structural deformations of the carrier pin are the main causes of the unbalanced meshing loads， and the resonance of the system will aggravate this phenomenon. In the resonance region， the dynamic meshing stiffness differs greatly from the static meshing stiffness. Increasing the carrier pin stiffness and the helix angle may improve the meshing condition and reduce the system vibration in the resonance region. But in low-speed region, that is not good for system vibration absorption. Increase of the rigidity of the carriers connecting plate may keep the systems vibration state in the low-speed region， and reduce the system vibration in the resonance region.

Key words: wind turbine gearbox, planetary gear train, structural flexibility, ring gear, dynamics

摘要： 为了深入研究重载行星齿轮传动多柔体变形下齿面载荷分布规律，提出一种计入结构柔性与齿轮副动态接触的行星齿轮传动耦合动力学建模方法。以某型兆瓦级风电齿轮箱行星轮系为研究对象，根据内齿圈、行星架结构及其边界特征，采用有限元缩聚理论建立内齿圈轮齿、行星架耦合点与弹性支撑之间的关联关系，利用齿轮副动态承载接触作为界面协调条件将各构件进行耦合，建立行星齿轮传动耦合动力学模型，分析了啮合偏载现象以及结构参数对啮合特性的影响。研究结果表明，作用在行星轮上的合弯矩以及行星架销轴非对称结构变形是造成啮合偏载的主要原因，系统共振会加剧啮合偏载程度；在共振区附近，齿轮动态啮合刚度与静态啮合刚度存在较大差异；增加销轴刚性、增大螺旋角可以改善啮合偏载程度，减小共振区系统振动，但在低转速区不利于系统减振，而增大行星架连接板刚性可以保持低转速区系统振动状态，同时减小共振区系统振动。

关键词: 风电齿轮箱, 行星轮系, 结构柔性, 内齿圈, 动力学

CLC Number:

TM614

TAN Jianjun, LI Hao, YANG Shuyi, ZHU Caichao, SONG Chaosheng, SUN Zhangdong. Study on Unbalanced Meshing Loads of Planetary Gear Transmission under Heavy-load Conditions[J]. China Mechanical Engineering, 2023, 34(13): 1513-1524.

谭建军, 李浩, 杨书益, 朱才朝, 宋朝省, 孙章栋. 重载工况下行星齿轮传动啮合偏载分析[J]. 中国机械工程, 2023, 34(13): 1513-1524.

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