直線(xian)(xian)(xian)導(dao)(dao)軌(gui)又稱線(xian)(xian)(xian)軌(gui)、滑軌(gui)、線(xian)(xian)(xian)性導(dao)(dao)軌(gui)、線(xian)(xian)(xian)性滑軌(gui)，用于高精或高速直線(xian)(xian)(xian)往(wang)復(fu)運(yun)動場合，且可以(yi)承擔一(yi)定的扭矩，可在(zai)高負載的情(qing)況下實現高精度的直線(xian)(xian)(xian)運(yun)動。

直線(xian)(xian)(xian)導(dao)(dao)(dao)(dao)軌運(yun)動(dong)(dong)的(de)(de)(de)(de)(de)(de)作用(yong)(yong)(yong)(yong)是(shi)(shi)(shi)用(yong)(yong)(yong)(yong)來支撐和引導(dao)(dao)(dao)(dao)運(yun)動(dong)(dong)部件，按給定的(de)(de)(de)(de)(de)(de)方(fang)向做往復直線(xian)(xian)(xian)運(yun)動(dong)(dong)。　直線(xian)(xian)(xian)軸承(cheng)主要用(yong)(yong)(yong)(yong)在(zai)(zai)自動(dong)(dong)化(hua)機(ji)械上比較多(duo),像直線(xian)(xian)(xian)導(dao)(dao)(dao)(dao)軌主要是(shi)(shi)(shi)用(yong)(yong)(yong)(yong)在(zai)(zai)精(jing)(jing)度(du)要求比較高的(de)(de)(de)(de)(de)(de)機(ji)械結構上,直線(xian)(xian)(xian)導(dao)(dao)(dao)(dao)軌的(de)(de)(de)(de)(de)(de)移動(dong)(dong)元件和固定元件之間(jian)不用(yong)(yong)(yong)(yong)中(zhong)間(jian)介質，而(er)用(yong)(yong)(yong)(yong)滾動(dong)(dong)鋼球。可以理解為是(shi)(shi)(shi)一(yi)種(zhong)滾動(dong)(dong)導(dao)(dao)(dao)(dao)引，是(shi)(shi)(shi)由鋼珠在(zai)(zai)滑(hua)塊跟(gen)導(dao)(dao)(dao)(dao)軌之間(jian)無限滾動(dong)(dong)循環， 從而(er)使負(fu)載平(ping)臺沿著(zhu)導(dao)(dao)(dao)(dao)軌輕(qing)易的(de)(de)(de)(de)(de)(de)高精(jing)(jing)度(du)線(xian)(xian)(xian)性運(yun)動(dong)(dong)，并將(jiang)摩擦系(xi)數(shu)降至平(ping)常傳統滑(hua)動(dong)(dong)導(dao)(dao)(dao)(dao)引的(de)(de)(de)(de)(de)(de)五十(shi)分(fen)之一(yi)，能輕(qing)易地達到很高的(de)(de)(de)(de)(de)(de)定位(wei)精(jing)(jing)度(du)。滑(hua)塊跟(gen)導(dao)(dao)(dao)(dao)軌間(jian)末制單元設(she)計(ji)，使線(xian)(xian)(xian)形導(dao)(dao)(dao)(dao)軌同時承(cheng)受(shou)上下左(zuo)右等各方(fang)向的(de)(de)(de)(de)(de)(de)負(fu)荷(he)，回(hui)流系(xi)統及精(jing)(jing)簡化(hua)的(de)(de)(de)(de)(de)(de)結構設(she)計(ji)讓線(xian)(xian)(xian)性導(dao)(dao)(dao)(dao)軌有(you)更平(ping)順且低噪音的(de)(de)(de)(de)(de)(de)運(yun)動(dong)(dong)。

滑塊-使運動由曲線轉(zhuan)變為直線。

直線導軌主(zhu)要(yao)是用(yong)在精(jing)度要(yao)求比較(jiao)高的機(ji)(ji)械(xie)(xie)結(jie)構上,直線導軌的移動(dong)(dong)元(yuan)件和固定元(yuan)件之間不用(yong)中(zhong)間介質，而用(yong)滾動(dong)(dong)鋼(gang)球。因為滾動(dong)(dong)鋼(gang)球適應于高速運(yun)動(dong)(dong)、摩擦(ca)系數小、靈敏(min)度高，滿足運(yun)動(dong)(dong)部件的工作要(yao)求，被廣泛(fan)應用(yong)在自(zi)(zi)(zi)動(dong)(dong)化(hua)機(ji)(ji)械(xie)(xie)上比較(jiao)多,像(xiang)磨床、銑床、車床、檢測儀器設備(bei)、木工機(ji)(ji)械(xie)(xie)、搬(ban)運(yun)機(ji)(ji)械(xie)(xie)、傳(chuan)送裝置、自(zi)(zi)(zi)動(dong)(dong)化(hua)機(ji)(ji)械(xie)(xie)、半導體機(ji)(ji)械(xie)(xie)、包裝機(ji)(ji)械(xie)(xie)、機(ji)(ji)械(xie)(xie)手(shou)臂、自(zi)(zi)(zi)動(dong)(dong)化(hua)機(ji)(ji)床、激光行業(ye)、汽(qi)車制(zhi)造(zao)、新能源等行業(ye)。