The four main types of gears (spur, helical, worm, and bevel) and a rack and pinion are shown in Figure 7.

图7所示是四种主要的齿轮(巨齿轮，斜齿轮，蜗轮和伞齿轮)以及齿条和小齿轮。

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The four main types of gears (spur, helical, worm, and bevel) and a rack and pinion are shown in Figure 7.

图7所示是四种主要的齿轮(巨齿轮，斜齿轮，蜗轮和伞齿轮)以及齿条和小齿轮。

youdao