直(zhi)線(xian)導軌(gui)又稱線(xian)軌(gui)、滑(hua)軌(gui)、線(xian)性導軌(gui)、線(xian)性滑(hua)軌(gui)，用(yong)于高(gao)精或(huo)高(gao)速直(zhi)線(xian)往復(fu)運動場合，且(qie)可(ke)以承擔一定的(de)扭(niu)矩，可(ke)在高(gao)負(fu)載的(de)情況下實現高(gao)精度的(de)直(zhi)線(xian)運動。

直(zhi)線(xian)(xian)(xian)導(dao)(dao)(dao)軌(gui)(gui)運(yun)(yun)動(dong)(dong)的(de)(de)作(zuo)用(yong)(yong)是用(yong)(yong)來(lai)支撐和引(yin)導(dao)(dao)(dao)運(yun)(yun)動(dong)(dong)部件，按給定的(de)(de)方向做往(wang)復直(zhi)線(xian)(xian)(xian)運(yun)(yun)動(dong)(dong)。　直(zhi)線(xian)(xian)(xian)軸承(cheng)(cheng)主要用(yong)(yong)在(zai)自動(dong)(dong)化機械上(shang)比(bi)較多(duo),像直(zhi)線(xian)(xian)(xian)導(dao)(dao)(dao)軌(gui)(gui)主要是用(yong)(yong)在(zai)精(jing)度(du)要求比(bi)較高(gao)的(de)(de)機械結構(gou)上(shang),直(zhi)線(xian)(xian)(xian)導(dao)(dao)(dao)軌(gui)(gui)的(de)(de)移動(dong)(dong)元(yuan)件和固定元(yuan)件之(zhi)(zhi)間不用(yong)(yong)中間介質，而(er)用(yong)(yong)滾動(dong)(dong)鋼球。可以理解為(wei)是一(yi)種滾動(dong)(dong)導(dao)(dao)(dao)引(yin)，是由(you)鋼珠在(zai)滑(hua)塊跟導(dao)(dao)(dao)軌(gui)(gui)之(zhi)(zhi)間無限滾動(dong)(dong)循環， 從而(er)使(shi)負(fu)(fu)載平(ping)臺沿著(zhu)導(dao)(dao)(dao)軌(gui)(gui)輕(qing)易的(de)(de)高(gao)精(jing)度(du)線(xian)(xian)(xian)性(xing)(xing)運(yun)(yun)動(dong)(dong)，并將摩擦系數降至(zhi)平(ping)常傳統(tong)滑(hua)動(dong)(dong)導(dao)(dao)(dao)引(yin)的(de)(de)五十分之(zhi)(zhi)一(yi)，能輕(qing)易地達到(dao)很高(gao)的(de)(de)定位(wei)精(jing)度(du)。滑(hua)塊跟導(dao)(dao)(dao)軌(gui)(gui)間末制單(dan)元(yuan)設計，使(shi)線(xian)(xian)(xian)形導(dao)(dao)(dao)軌(gui)(gui)同時(shi)承(cheng)(cheng)受上(shang)下左(zuo)右等(deng)各方向的(de)(de)負(fu)(fu)荷，回流(liu)系統(tong)及精(jing)簡化的(de)(de)結構(gou)設計讓(rang)線(xian)(xian)(xian)性(xing)(xing)導(dao)(dao)(dao)軌(gui)(gui)有更平(ping)順且低噪音的(de)(de)運(yun)(yun)動(dong)(dong)。

滑塊-使運動(dong)由曲線轉變為直線。

直線導軌主要是用在精度(du)要求比(bi)較高的機(ji)(ji)(ji)械(xie)結構上,直線導軌的移動元件(jian)和固定(ding)元件(jian)之間不用中間介質，而用滾動鋼球。因為滾動鋼球適(shi)應(ying)(ying)于高速運動、摩擦系數小、靈敏度(du)高，滿(man)足運動部件(jian)的工作要求，被廣泛應(ying)(ying)用在自動化機(ji)(ji)(ji)械(xie)上比(bi)較多,像磨床、銑(xian)床、車(che)床、檢測儀器(qi)設備、木工機(ji)(ji)(ji)械(xie)、搬運機(ji)(ji)(ji)械(xie)、傳送裝置、自動化機(ji)(ji)(ji)械(xie)、半(ban)導體(ti)機(ji)(ji)(ji)械(xie)、包裝機(ji)(ji)(ji)械(xie)、機(ji)(ji)(ji)械(xie)手臂、自動化機(ji)(ji)(ji)床、激光行業、汽車(che)制(zhi)造、新能源等行業。