直線導軌(gui)又(you)稱線軌(gui)、滑軌(gui)、線性(xing)(xing)導軌(gui)、線性(xing)(xing)滑軌(gui)，用于高(gao)(gao)精(jing)或高(gao)(gao)速直線往復運動場合，且(qie)可以承擔一定(ding)的扭矩，可在高(gao)(gao)負載的情況下實(shi)現高(gao)(gao)精(jing)度的直線運動。

直(zhi)(zhi)線(xian)(xian)導(dao)軌(gui)運(yun)(yun)動(dong)(dong)(dong)的(de)(de)(de)(de)作用(yong)是用(yong)來支撐和引(yin)導(dao)運(yun)(yun)動(dong)(dong)(dong)部件(jian)(jian)，按給(gei)定的(de)(de)(de)(de)方向做往(wang)復直(zhi)(zhi)線(xian)(xian)運(yun)(yun)動(dong)(dong)(dong)。　直(zhi)(zhi)線(xian)(xian)軸承主要用(yong)在自(zi)動(dong)(dong)(dong)化機械上(shang)比較多,像直(zhi)(zhi)線(xian)(xian)導(dao)軌(gui)主要是用(yong)在精(jing)(jing)度要求比較高(gao)(gao)的(de)(de)(de)(de)機械結構(gou)上(shang),直(zhi)(zhi)線(xian)(xian)導(dao)軌(gui)的(de)(de)(de)(de)移動(dong)(dong)(dong)元件(jian)(jian)和固定元件(jian)(jian)之間(jian)不用(yong)中間(jian)介質，而(er)用(yong)滾(gun)動(dong)(dong)(dong)鋼(gang)球。可以理解為是一(yi)種(zhong)滾(gun)動(dong)(dong)(dong)導(dao)引(yin)，是由鋼(gang)珠在滑塊(kuai)跟導(dao)軌(gui)之間(jian)無限滾(gun)動(dong)(dong)(dong)循環， 從(cong)而(er)使負載平臺沿著導(dao)軌(gui)輕易的(de)(de)(de)(de)高(gao)(gao)精(jing)(jing)度線(xian)(xian)性運(yun)(yun)動(dong)(dong)(dong)，并(bing)將(jiang)摩擦系數(shu)降至平常傳(chuan)統(tong)滑動(dong)(dong)(dong)導(dao)引(yin)的(de)(de)(de)(de)五十分之一(yi)，能輕易地(di)達到很高(gao)(gao)的(de)(de)(de)(de)定位(wei)精(jing)(jing)度。滑塊(kuai)跟導(dao)軌(gui)間(jian)末制單(dan)元設計，使線(xian)(xian)形導(dao)軌(gui)同時承受上(shang)下左右等各(ge)方向的(de)(de)(de)(de)負荷，回流系統(tong)及(ji)精(jing)(jing)簡(jian)化的(de)(de)(de)(de)結構(gou)設計讓線(xian)(xian)性導(dao)軌(gui)有更平順且低(di)噪音(yin)的(de)(de)(de)(de)運(yun)(yun)動(dong)(dong)(dong)。

滑(hua)塊-使運動由(you)曲線(xian)轉變為直線(xian)。

直線導(dao)軌主(zhu)要(yao)(yao)是用在精(jing)度(du)要(yao)(yao)求(qiu)比較高(gao)的機(ji)(ji)(ji)(ji)械(xie)結構上,直線導(dao)軌的移動元件(jian)和固定元件(jian)之間不用中間介質，而(er)用滾(gun)動鋼球(qiu)(qiu)。因為滾(gun)動鋼球(qiu)(qiu)適應于高(gao)速運動、摩擦系數小、靈敏度(du)高(gao)，滿(man)足運動部(bu)件(jian)的工(gong)作要(yao)(yao)求(qiu)，被廣泛應用在自(zi)動化(hua)機(ji)(ji)(ji)(ji)械(xie)上比較多,像磨床(chuang)、銑床(chuang)、車(che)床(chuang)、檢測儀器(qi)設備、木(mu)工(gong)機(ji)(ji)(ji)(ji)械(xie)、搬(ban)運機(ji)(ji)(ji)(ji)械(xie)、傳(chuan)送裝(zhuang)置、自(zi)動化(hua)機(ji)(ji)(ji)(ji)械(xie)、半導(dao)體機(ji)(ji)(ji)(ji)械(xie)、包裝(zhuang)機(ji)(ji)(ji)(ji)械(xie)、機(ji)(ji)(ji)(ji)械(xie)手臂、自(zi)動化(hua)機(ji)(ji)(ji)(ji)床(chuang)、激光行(xing)(xing)業、汽車(che)制造、新能源等行(xing)(xing)業。