某型拉维纳式齿轮变速器轮齿结构设计

为提高双排行星轮系齿轮变速器设计过程中各轮轮齿结构的合理性，以某型拉维纳式齿轮变速器为研究对象，首先分析了该齿轮变速器的结构组成和工作原理，明确了各挡位动力传动路线；其次计算了各挡位自由度与传动比，分析了该轮系的运动学特性；最后通过邻接条件、同心条件与安装条件，校核该齿轮变速器行星轮系的装配条件。结果表明：各齿轮轮齿结构能够满足双排行星轮系的装配条件，并能够实现运动确定、速比合理的7挡变速功能。

Tooth Structure Design for a Certain Type of Ravina Gear Transmission

In order to improve the rationality of the tooth structure in the design process of double row planetary gear transmission, the structure and working principle of a certain type of Ravina gear transmission are analyzed, and the power transmission lines of each gear are defined at first. Secondly, the degree of freedom and transmission ratio of each gear are calculated, and the kinematic characteristics of the gear train are analyzed. At last, the assembly conditions of the planetary gear train are checked by adjacent conditions, concentric conditions and installation conditions. The results show that the tooth structure of each gear can meet the assembly conditions of the double row planetary gear train, and can realize the function of 7-speed transmission with motion determination and reasonable speed ratio.