如果大齿轮与小齿轮不相啮合的话，机器就不会工作。

If the big gear did not engage with the small one, the machine would refuse to work.

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内啮合齿轮泵中的小齿轮是主动轮，大齿轮为从动轮，在工作时大齿轮随小齿轮同向旋转。

Internal gear pump is the small gear wheel, the big gear for driven wheel, in work big gear with small gear cocurrent rotation.

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摆线齿形的内啮合齿轮泵又叫做摆线转子泵，泵中的小齿轮和内齿轮只相关一个齿，因此这种内啮合齿轮泵不需要设置隔板。

Cycloidal tooth profile of the internal gear pump, also called cycloidal rotor pump, pump the small gear and internal gear only related a tooth, so the internal gear pump do not need to set partition.

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