有些车的转向系角传动比是可变的，这种转向器采用齿轮齿条式，它在中间而不是外部，有不同的齿密度（每寸齿数）。

Some cars have variable-ratio steering, which uses a rack-and-pinion gear set that has a different tooth pitch (number of teeth per inch) in the center than it has on the outside.

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介绍了谐波齿轮传动的工作原理，输入与输出同轴、结构简单、且输出在电机与减速器中间的减速传动。

This paper introduced the theory of harmonic gear and one reducing transmission from the middle of motor and reducer , which has the same shaft for output and input and a simple structure .

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SGTN系列旋耕机灭茬机采用中间齿轮传动结构，是为12 ~ 80马力拖拉机配套的耕作机械。

SGTN series rotary tiller is adopted middle gear transmission system, mounted with the tractor of 12-80hp.

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