液力自动变速器一种变速装置，是由液力变扭器和行星齿轮变速器组合而成的变速器。液力变扭器（HYDRAULIC CONVERTER），是能改变所传递扭矩的液力传动装置。
AMT和液力自动变速器(AT)一样是有级自动变速器。
AMT and the hydraulic automatic transmission gearbox (at) is the having steps automatic transmission equally.
采用液力自动变速器是汽车新技术的一个标志，它有许多其他变速器不可替代的优点。
Automatic transmission (at) is a sign of the new automobile technology, and it has a lot of merits that other transmissions don't have.
本文针对TN518型牵引车的作业特点，分析并设计了YYX20A型液力自动变速器。
This thesis analyzed the working characteristic of the TN518towing vehicle and designed YYX20A automatic transmission to match with it,.
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