直线导轨运动的作用是用来支撑和引导运动部件，按给定的方向做往复直线运动。依按摩擦性质而定，直线运动导轨可以分为滑动摩擦导轨、滚动摩擦导轨、弹性摩擦导轨、流体摩擦导轨等种类。
The function of linear guideway motion is to support and guide the moving parts and make reciprocating linear motion in a given direction. According to the nature of massage and friction, linear motion guides can be divided into sliding friction guides, rolling friction guides, elastic friction guides and fluid friction guides.
直线轴承主要用在自动化机械上比较多，像德国进口的机床，折弯机，激光焊接机等等，当然直线轴承和直线轴是配套用的。像直线导轨主要是用在精度要求比较高的机械结构上，直线导轨的移动元件和固定元件之间不用中间介质，而用滚动钢球。
Linear bearings are mainly used in automation machinery, such as German imported machine tools, benders, laser welding machines and so on. Of course, linear bearings and linear shafts are matched. Like linear guides, they are mainly used in mechanical structures with high precision requirements. There is no intermediate between the moving elements and the fixed elements of linear guides, but rolling steel balls.