比较不同结构型式行星齿轮机构的特点，基于它们各自的优缺点，选用拉威娜式自动变速器作为研究对象。
The structure and characteristic of different kinds of planetary gear train is briefly analyzed, based on this, Ravigneavx AT is selected as the research object.
比较不同结构型式行星齿轮机构的特点，基于它们各自的优缺点，选用拉威娜式自动变速器作为研究对象。
The structure and characteristic of different kinds of planetary gear train is briefly analyzed, based on this, Ravigneavx AT is selected as the research object.
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