面齿轮传动是一种新型齿轮传动方式，当锥齿轮与圆柱齿轮啮合，两轮轴线垂直时称为面齿轮传动，即面齿轮传动是一种特殊的锥齿轮传动。与锥齿轮相比，面齿轮传动因重合度大、结构紧凑、运动噪声小、传动比大等优点，在航空工业中越来越受重视。因其具有良好的“分扭—汇扭”作用，在直升机动力传动系统中也展现出广阔的应用前景。本文的主要研究内容及成果如下：

(1) 为了改善面齿轮副的啮合特性与承载接触特性，对面齿轮副的齿面进行了主动修形。齿轮主动修形是一种可以直接预控齿轮啮合性能的方法。对面齿轮副可采用主动修形的方法来预控其几何性能，从而对其承载接触特性进行预控。这说明主动修形微观修形参数与面齿轮副的承载接触特性之间存在着必然的联系。为了进一步研究微观修形参数对面齿轮承载接触特性的影响，首先，建立了面齿轮副主动修形的有限元装配模型；其次，通过有限元仿真获得修形参数不同时面齿轮副的承载接触特性；最后，通过不同修形参数对面齿轮副承载特性的影响，判断出各主动修形微观参数的最佳取值范围。从而为面齿轮的加工、应用提供设计依据。

(2) 面齿轮齿面为复杂的空间异形曲面，使其加工制造较为困难、加工成本较高。为了简单、高效的加工面齿轮，根据传统面齿轮的齿形特征，提出了面齿轮齿面可由一系列直线族构成的假设，通过在其齿面上建立空间直线方程验证了齿面直线族的存在；基于渐开线建立了可展直纹面面齿轮数学模型，并对其进行了齿面修形；分析了面齿轮直线齿廓与传统齿廓的偏差，并讨论了传动比对偏差的影响，结果表明传动比较大时两者偏差较小，可使用直线齿廓代替传统齿廓。

(3) 通过齿面接触分析，对可展直纹面面齿轮的啮合特性进行评价；为说明可展直纹面代替传统齿面的可行性，对其进行承载接触分析，并与传统面齿轮副及主动修形面齿轮副的承载特性进行比较，结果显示：可展直纹面与传统齿面承载能力相当。

Face gear drive is a new type of gear drive mode. When bevel gear and cylindrical gear mesh and the axes of the two wheel are vertical, it is called face gear drive. Namely face gear drive is a special bevel gear transmission. Compared with bevel gear, face gear transmission has attracted more and more attention in the aviation industry because of its advantages, such as large coincidence degree, compact structure, low motion noise and large transmission ratio. Because of its good function of ‘split of torque-sink of torque’, it also shows a broad application prospect in helicopter power transmission system. The main research contents and achievements of this paper are as follows:

(1) In order to improve the meshing and load-bearing contact characteristics of face gear pair, the tooth surface of face gear pair is actively modified. Active modification of gear is a method that can directly pre control the meshing performance of gear. The geometric performance of opposite gear pair can be pre controlled by active modification, so as to pre control the load-bearing contact characteristics of gear surface. It shows that there is an inevitable relationship between the micro modification parameters of active modification and the load-bearing contact characteristics of face gear pair. In order to further research the influence of micro modification parameters on the bearing contact characteristics of face gear, Firstly, the finite element assembly model of active modification of face gear pair is established ; Secondly, the load-bearing contact characteristics of face gear pairs with different modification parameters are obtained by finite element simulation ;Finally, through the influence of different modification parameters on the bearing characteristics of face gear pair, the optimal value range of micro parameters of active modification is determined . So as to provide design basis for the processing and application of face gear.

(2) The tooth surface of face gear is a complex spatial special-shaped curved surface, which makes it difficult to manufacture and high processing cost. In order to process face gear simply and efficiently, according to the tooth profile characteristics of traditional face gear, the hypothesis that the tooth surface of face gear can be composed of a series of straight line families is put forward. The existence of tooth surface straight line families is verified by establishing spatial straight line equations on its tooth surface; The mathematical model of developable ruled surface gear is established based on involute, and its tooth surface is modified; The deviation between the linear tooth profile and the theoretical tooth profile of face gear is analyzed, and the influence of transmission ratio on it is discussed. The results show that the deviation between the two is small when the transmission ratio is large, and the straight tooth profile can be used instead of theoretical tooth profile. 

(3) The meshing characteristics of developable ruled surface gear are evaluated by tooth surface contact analysis; In order to illustrate the feasibility of the developable ruled surface replacing the theoretical tooth surface, the load-bearing contact analysis is carried out, and the load-bearing characteristics are compared with the theoretical surface gear pair and the active modified surface gear pair. The results show that the load-bearing capacity of the developable ruled surface is equivalent to that of the theoretical tooth surface.

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