(1)功能:键是一种标准零件，通常用来实现轴与轮载之间的周向固定以传递转矩，有的还能实现轴上零件的轴向固定或轴向滑动的导向。

(2) 主要类型:平键连接、半圆键连接、模键连接和切向键连接。

①平键连接

键的两侧面是工作面，工作时靠键与键槽侧面的挤压来传递扭矩。平键具有结构简单、装拆方便、对中性好的优点，但是平键连接不能承受轴向力，因此，不能用于轴向固定。其按用途可分为普通平键、薄型平键、导向平键和滑键。

a. 普通平键按构造分为圆头(A 型)、平头(B 型)和单圆头(C 型) 。

b. 薄型平键与普通平键的主要区别是键的高度约为普通平键的60 -70% 。薄型平键传递转矩的能力较低，常用于薄壁结构、空心轴及一些径向尺寸受限制的场合。

c. 导向平键长度较长，需用螺钉固定，为便于装拆，制有起键螺孔。

d. 滑移距离较大时，所需导向平键过长，制造困难，此时可采用滑键。

②半圆键连接

半圆键工作时，靠其侧面来传递转矩。

优点:工艺性较好，装配方便，尤其适用于锥形轴端与轮载的连接;

缺点:轴上键槽较深，对轴的强度削弱较大，故一般只用于轻载静连接中。

③模键连接

模键的上下两面是工作面，键的上表面和与它相配合的轮毅键槽底面均有1: 100 的斜度。工作时，靠键的模紧作用来传递转矩，同时还可以承受单向的轴向载荷。由于模键模紧后，轴与轮载的配合易产生偏心和偏斜，因此主要用于毅类零件的定心精度要求不高和低转速的场合。

④切向键连接

切向键是由一对斜度为1: 100 的模键组成，其工作面是由一对模键沿斜面拼合后相互平行的两个窄面。当需要传递双向转矩时，必须用两个切向键，两者之间的夹角为

120度 - 130度。

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