直(zhi)線(xian)導(dao)軌(gui)又稱線(xian)軌(gui)、滑(hua)軌(gui)、線(xian)性導(dao)軌(gui)、線(xian)性滑(hua)軌(gui)，用于高精或高速直(zhi)線(xian)往復運動(dong)場合，且可(ke)以承(cheng)擔一定(ding)的(de)扭矩，可(ke)在(zai)高負載(zai)的(de)情況下(xia)實現高精度(du)的(de)直(zhi)線(xian)運動(dong)。

直(zhi)線(xian)(xian)導軌(gui)運動(dong)(dong)(dong)的(de)(de)作用(yong)(yong)是(shi)用(yong)(yong)來支(zhi)撐和(he)引導運動(dong)(dong)(dong)部件(jian)，按(an)給(gei)定的(de)(de)方(fang)向做往復直(zhi)線(xian)(xian)運動(dong)(dong)(dong)。　直(zhi)線(xian)(xian)軸(zhou)承(cheng)主(zhu)要用(yong)(yong)在自動(dong)(dong)(dong)化機(ji)械上(shang)(shang)比(bi)較(jiao)多,像直(zhi)線(xian)(xian)導軌(gui)主(zhu)要是(shi)用(yong)(yong)在精度(du)(du)要求(qiu)比(bi)較(jiao)高(gao)的(de)(de)機(ji)械結構(gou)上(shang)(shang),直(zhi)線(xian)(xian)導軌(gui)的(de)(de)移動(dong)(dong)(dong)元件(jian)和(he)固定元件(jian)之(zhi)間(jian)(jian)不用(yong)(yong)中間(jian)(jian)介質(zhi)，而(er)用(yong)(yong)滾動(dong)(dong)(dong)鋼(gang)球。可以(yi)理解(jie)為是(shi)一(yi)種滾動(dong)(dong)(dong)導引，是(shi)由鋼(gang)珠(zhu)在滑(hua)塊跟導軌(gui)之(zhi)間(jian)(jian)無限滾動(dong)(dong)(dong)循(xun)環， 從而(er)使負載平(ping)臺沿著導軌(gui)輕易的(de)(de)高(gao)精度(du)(du)線(xian)(xian)性(xing)運動(dong)(dong)(dong)，并將摩擦系數降至(zhi)平(ping)常傳(chuan)統(tong)(tong)滑(hua)動(dong)(dong)(dong)導引的(de)(de)五十分之(zhi)一(yi)，能輕易地達到很(hen)高(gao)的(de)(de)定位(wei)精度(du)(du)。滑(hua)塊跟導軌(gui)間(jian)(jian)末制單元設計，使線(xian)(xian)形導軌(gui)同時承(cheng)受上(shang)(shang)下(xia)左右(you)等(deng)各方(fang)向的(de)(de)負荷，回流系統(tong)(tong)及精簡化的(de)(de)結構(gou)設計讓線(xian)(xian)性(xing)導軌(gui)有更平(ping)順且低噪音的(de)(de)運動(dong)(dong)(dong)。

滑(hua)塊-使運動由曲線轉變為直(zhi)線。

直線(xian)導(dao)(dao)軌主要是用(yong)在精度要求比較高(gao)(gao)的(de)機(ji)(ji)(ji)械(xie)(xie)(xie)結構上,直線(xian)導(dao)(dao)軌的(de)移動(dong)元(yuan)件和固定(ding)元(yuan)件之間(jian)不(bu)用(yong)中(zhong)間(jian)介質，而用(yong)滾動(dong)鋼球。因為滾動(dong)鋼球適應(ying)于高(gao)(gao)速運動(dong)、摩擦系(xi)數小(xiao)、靈敏度高(gao)(gao)，滿足運動(dong)部件的(de)工(gong)作(zuo)要求，被廣泛(fan)應(ying)用(yong)在自(zi)(zi)動(dong)化機(ji)(ji)(ji)械(xie)(xie)(xie)上比較多(duo),像磨床、銑床、車床、檢測儀(yi)器(qi)設備、木工(gong)機(ji)(ji)(ji)械(xie)(xie)(xie)、搬(ban)運機(ji)(ji)(ji)械(xie)(xie)(xie)、傳送裝(zhuang)置、自(zi)(zi)動(dong)化機(ji)(ji)(ji)械(xie)(xie)(xie)、半導(dao)(dao)體機(ji)(ji)(ji)械(xie)(xie)(xie)、包裝(zhuang)機(ji)(ji)(ji)械(xie)(xie)(xie)、機(ji)(ji)(ji)械(xie)(xie)(xie)手臂、自(zi)(zi)動(dong)化機(ji)(ji)(ji)床、激光行業、汽車制造(zao)、新能源(yuan)等行業。