直(zhi)線(xian)導軌(gui)(gui)又稱線(xian)軌(gui)(gui)、滑(hua)軌(gui)(gui)、線(xian)性導軌(gui)(gui)、線(xian)性滑(hua)軌(gui)(gui)，用于高(gao)精或高(gao)速直(zhi)線(xian)往復運動(dong)場合，且可以承擔一定的(de)扭(niu)矩，可在(zai)高(gao)負載的(de)情況(kuang)下實現高(gao)精度的(de)直(zhi)線(xian)運動(dong)。

直(zhi)線(xian)(xian)(xian)(xian)導(dao)(dao)(dao)(dao)(dao)軌(gui)(gui)運動(dong)(dong)的(de)作用(yong)(yong)是(shi)用(yong)(yong)來支撐和(he)引(yin)導(dao)(dao)(dao)(dao)(dao)運動(dong)(dong)部件，按(an)給(gei)定的(de)方向(xiang)做往復直(zhi)線(xian)(xian)(xian)(xian)運動(dong)(dong)。　直(zhi)線(xian)(xian)(xian)(xian)軸承主(zhu)(zhu)要(yao)用(yong)(yong)在自動(dong)(dong)化(hua)(hua)機械上(shang)比較多,像直(zhi)線(xian)(xian)(xian)(xian)導(dao)(dao)(dao)(dao)(dao)軌(gui)(gui)主(zhu)(zhu)要(yao)是(shi)用(yong)(yong)在精度要(yao)求比較高(gao)的(de)機械結(jie)構(gou)上(shang),直(zhi)線(xian)(xian)(xian)(xian)導(dao)(dao)(dao)(dao)(dao)軌(gui)(gui)的(de)移(yi)動(dong)(dong)元(yuan)件和(he)固定元(yuan)件之(zhi)間(jian)(jian)不用(yong)(yong)中間(jian)(jian)介質，而用(yong)(yong)滾動(dong)(dong)鋼(gang)球。可以(yi)理解為是(shi)一種(zhong)滾動(dong)(dong)導(dao)(dao)(dao)(dao)(dao)引(yin)，是(shi)由鋼(gang)珠在滑塊跟(gen)導(dao)(dao)(dao)(dao)(dao)軌(gui)(gui)之(zhi)間(jian)(jian)無限滾動(dong)(dong)循(xun)環， 從而使負(fu)載平臺沿著導(dao)(dao)(dao)(dao)(dao)軌(gui)(gui)輕易的(de)高(gao)精度線(xian)(xian)(xian)(xian)性運動(dong)(dong)，并(bing)將摩擦(ca)系數降至平常傳(chuan)統(tong)滑動(dong)(dong)導(dao)(dao)(dao)(dao)(dao)引(yin)的(de)五十分之(zhi)一，能輕易地達(da)到很高(gao)的(de)定位精度。滑塊跟(gen)導(dao)(dao)(dao)(dao)(dao)軌(gui)(gui)間(jian)(jian)末制單元(yuan)設計，使線(xian)(xian)(xian)(xian)形(xing)導(dao)(dao)(dao)(dao)(dao)軌(gui)(gui)同時承受(shou)上(shang)下左右(you)等各方向(xiang)的(de)負(fu)荷，回流(liu)系統(tong)及(ji)精簡化(hua)(hua)的(de)結(jie)構(gou)設計讓(rang)線(xian)(xian)(xian)(xian)性導(dao)(dao)(dao)(dao)(dao)軌(gui)(gui)有(you)更平順且低噪音的(de)運動(dong)(dong)。

滑塊-使運動(dong)由曲線轉(zhuan)變為直(zhi)線。

直(zhi)線(xian)導(dao)軌(gui)主要(yao)是用(yong)(yong)(yong)在精度(du)要(yao)求比(bi)較高的機(ji)(ji)(ji)(ji)械結構上,直(zhi)線(xian)導(dao)軌(gui)的移動(dong)元(yuan)件和固定元(yuan)件之間(jian)不用(yong)(yong)(yong)中間(jian)介質，而(er)用(yong)(yong)(yong)滾(gun)動(dong)鋼球(qiu)。因為滾(gun)動(dong)鋼球(qiu)適應于高速運動(dong)、摩擦(ca)系數小、靈敏度(du)高，滿足(zu)運動(dong)部件的工作(zuo)要(yao)求，被廣泛應用(yong)(yong)(yong)在自動(dong)化機(ji)(ji)(ji)(ji)械上比(bi)較多,像磨床、銑床、車(che)床、檢測儀器設備(bei)、木(mu)工機(ji)(ji)(ji)(ji)械、搬運機(ji)(ji)(ji)(ji)械、傳送(song)裝(zhuang)置、自動(dong)化機(ji)(ji)(ji)(ji)械、半導(dao)體機(ji)(ji)(ji)(ji)械、包裝(zhuang)機(ji)(ji)(ji)(ji)械、機(ji)(ji)(ji)(ji)械手臂、自動(dong)化機(ji)(ji)(ji)(ji)床、激(ji)光行(xing)(xing)業、汽車(che)制造、新(xin)能(neng)源等(deng)行(xing)(xing)業。