题目内容

试为下列齿轮选材，并确定热处理：（参考课本表9-2）（1）不需润滑的低速、无冲击齿轮，如打稻机上的传动齿轮。（2）尺寸较大，形状复杂的低速中载齿轮。（3）低速、受力较小，要求有一定抗蚀性的轻载齿轮（如钟表齿轮）。（4）高速、受力较大，并受冲击，要求高耐磨性的齿轮（如汽车变速齿轮）。

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