直線(xian)(xian)(xian)(xian)(xian)(xian)導軌(gui)又稱(cheng)線(xian)(xian)(xian)(xian)(xian)(xian)軌(gui)、滑(hua)軌(gui)、線(xian)(xian)(xian)(xian)(xian)(xian)性(xing)導軌(gui)、線(xian)(xian)(xian)(xian)(xian)(xian)性(xing)滑(hua)軌(gui)，用于高(gao)(gao)精或高(gao)(gao)速直線(xian)(xian)(xian)(xian)(xian)(xian)往復運(yun)動場(chang)合(he)，且(qie)可以(yi)承擔一定的扭矩，可在(zai)高(gao)(gao)負載的情(qing)況下(xia)實現(xian)高(gao)(gao)精度的直線(xian)(xian)(xian)(xian)(xian)(xian)運(yun)動。

直線(xian)(xian)導(dao)(dao)(dao)軌(gui)運(yun)(yun)動的(de)作用(yong)是(shi)用(yong)來支撐和引導(dao)(dao)(dao)運(yun)(yun)動部件，按給(gei)定的(de)方(fang)向做往(wang)復(fu)直線(xian)(xian)運(yun)(yun)動。　直線(xian)(xian)軸承主要(yao)(yao)用(yong)在(zai)自動化機(ji)械上(shang)比(bi)較多(duo),像(xiang)直線(xian)(xian)導(dao)(dao)(dao)軌(gui)主要(yao)(yao)是(shi)用(yong)在(zai)精度要(yao)(yao)求比(bi)較高的(de)機(ji)械結(jie)構(gou)上(shang),直線(xian)(xian)導(dao)(dao)(dao)軌(gui)的(de)移動元(yuan)件和固(gu)定元(yuan)件之(zhi)間不用(yong)中間介質，而用(yong)滾(gun)(gun)動鋼球。可以理解為是(shi)一種滾(gun)(gun)動導(dao)(dao)(dao)引，是(shi)由鋼珠在(zai)滑(hua)塊跟(gen)導(dao)(dao)(dao)軌(gui)之(zhi)間無限滾(gun)(gun)動循(xun)環(huan)， 從(cong)而使(shi)(shi)負載平臺沿著導(dao)(dao)(dao)軌(gui)輕(qing)易的(de)高精度線(xian)(xian)性運(yun)(yun)動，并將摩擦系(xi)數降至平常傳統(tong)滑(hua)動導(dao)(dao)(dao)引的(de)五(wu)十分之(zhi)一，能輕(qing)易地達到很(hen)高的(de)定位精度。滑(hua)塊跟(gen)導(dao)(dao)(dao)軌(gui)間末制單元(yuan)設計，使(shi)(shi)線(xian)(xian)形導(dao)(dao)(dao)軌(gui)同時承受上(shang)下左右等各(ge)方(fang)向的(de)負荷，回流系(xi)統(tong)及精簡(jian)化的(de)結(jie)構(gou)設計讓線(xian)(xian)性導(dao)(dao)(dao)軌(gui)有(you)更(geng)平順且低(di)噪音的(de)運(yun)(yun)動。

滑塊(kuai)-使運動(dong)由曲線(xian)轉(zhuan)變為直線(xian)。

直線導(dao)軌主要(yao)是用(yong)在精(jing)度要(yao)求比較(jiao)高(gao)的機(ji)(ji)械(xie)結(jie)構上(shang),直線導(dao)軌的移動(dong)元件和固定元件之(zhi)間不用(yong)中間介質(zhi)，而用(yong)滾動(dong)鋼球。因為滾動(dong)鋼球適應于高(gao)速運動(dong)、摩擦(ca)系數小、靈(ling)敏度高(gao)，滿足(zu)運動(dong)部(bu)件的工作要(yao)求，被廣泛應用(yong)在自動(dong)化機(ji)(ji)械(xie)上(shang)比較(jiao)多,像磨床、銑(xian)床、車(che)床、檢測儀器(qi)設備、木工機(ji)(ji)械(xie)、搬運機(ji)(ji)械(xie)、傳送裝(zhuang)置、自動(dong)化機(ji)(ji)械(xie)、半導(dao)體機(ji)(ji)械(xie)、包裝(zhuang)機(ji)(ji)械(xie)、機(ji)(ji)械(xie)手臂、自動(dong)化機(ji)(ji)床、激光行業、汽車(che)制造(zao)、新(xin)能源等行業。