半弧
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The transmission system comprises a worm and one or more worm wheels which are engaged with the worm, wherein the worm wheel is provided with a semiarc tooth outline.
此传动系统包括一个蜗杆和一个或几个与蜗杆啮合的蜗轮。蜗轮具有半弧形齿轮廓。
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