直(zhi)線導(dao)軌運(yun)動(dong)(dong)的作用是(shi)用來支(zhi)撐和(he)引(yin)導(dao)運(yun)動(dong)(dong)部件，按給定的方向做往復直(zhi)線運(yun)動(dong)(dong)。依按摩擦性(xing)質而定，直(zhi)線運(yun)動(dong)(dong)導(dao)軌可以分(fen)為滑動(dong)(dong)摩擦導(dao)軌、滾動(dong)(dong)摩擦導(dao)軌、彈性(xing)摩擦導(dao)軌、流體摩擦導(dao)軌等種類(lei)。

直線(xian)(xian)軸承主要用(yong)在自動(dong)化機(ji)(ji)械上比較多,像德國進口的(de)機(ji)(ji)床,折彎(wan)機(ji)(ji),激光焊接機(ji)(ji)等等,當(dang)然直線(xian)(xian)軸承和直線(xian)(xian)軸是配(pei)套(tao)用(yong)的(de)。像直線(xian)(xian)導軌主要是用(yong)在精度要求比較高的(de)機(ji)(ji)械結構上,直線(xian)(xian)導軌的(de)移動(dong)元件(jian)和固定元件(jian)之(zhi)間(jian)(jian)不用(yong)中間(jian)(jian)介質，而用(yong)滾動(dong)鋼球。

1、直線導軌主要用在自動化機械上比較多,像德(de)國(guo)進口的機床,折彎(wan)機,激光焊接機等(deng)等(deng),當(dang)然(ran)直(zhi)線導軌(gui)和直(zhi)線軸是配套用的。　

2、直線(xian)(xian)導(dao)(dao)軌(gui)主要(yao)是用(yong)(yong)(yong)在(zai)精度要(yao)求(qiu)比較高的機械(xie)結構上,直線(xian)(xian)導(dao)(dao)軌(gui)的移動(dong)元(yuan)(yuan)件和固定元(yuan)(yuan)件之間不用(yong)(yong)(yong)中(zhong)間介質，而用(yong)(yong)(yong)滾動(dong)鋼(gang)(gang)球。因為滾動(dong)鋼(gang)(gang)球適應于高速運動(dong)、摩擦(ca)系數小、靈敏度高，滿(man)足運動(dong)部件的工(gong)作(zuo)要(yao)求(qiu)，如機床的刀架，拖板等(deng)。如果作(zuo)用(yong)(yong)(yong)在(zai)鋼(gang)(gang)球上的作(zuo)用(yong)(yong)(yong)力太大(da)，鋼(gang)(gang)球經受預加負荷時間過長(chang)，導(dao)(dao)致支架運動(dong)阻力增大(da)。