直(zhi)(zhi)線(xian)(xian)導軌(gui)(gui)又(you)稱線(xian)(xian)軌(gui)(gui)、滑軌(gui)(gui)、線(xian)(xian)性(xing)導軌(gui)(gui)、線(xian)(xian)性(xing)滑軌(gui)(gui)，用于高精(jing)或高速直(zhi)(zhi)線(xian)(xian)往復運(yun)動場合，且(qie)可以承擔一定的扭矩，可在高負載的情況(kuang)下(xia)實現(xian)高精(jing)度的直(zhi)(zhi)線(xian)(xian)運(yun)動。

直(zhi)(zhi)線(xian)(xian)導(dao)(dao)(dao)(dao)軌運(yun)(yun)動(dong)(dong)的(de)(de)作用(yong)(yong)(yong)是(shi)(shi)用(yong)(yong)(yong)來支撐和引(yin)導(dao)(dao)(dao)(dao)運(yun)(yun)動(dong)(dong)部件，按給(gei)定的(de)(de)方向做往復直(zhi)(zhi)線(xian)(xian)運(yun)(yun)動(dong)(dong)。　直(zhi)(zhi)線(xian)(xian)軸(zhou)承主要用(yong)(yong)(yong)在(zai)自動(dong)(dong)化機(ji)(ji)械上比較多(duo),像直(zhi)(zhi)線(xian)(xian)導(dao)(dao)(dao)(dao)軌主要是(shi)(shi)用(yong)(yong)(yong)在(zai)精(jing)(jing)度要求比較高(gao)(gao)的(de)(de)機(ji)(ji)械結構上,直(zhi)(zhi)線(xian)(xian)導(dao)(dao)(dao)(dao)軌的(de)(de)移(yi)動(dong)(dong)元(yuan)件和固定元(yuan)件之(zhi)(zhi)間不用(yong)(yong)(yong)中間介(jie)質，而用(yong)(yong)(yong)滾(gun)動(dong)(dong)鋼球(qiu)。可(ke)以(yi)理解為是(shi)(shi)一種滾(gun)動(dong)(dong)導(dao)(dao)(dao)(dao)引(yin)，是(shi)(shi)由鋼珠在(zai)滑塊跟導(dao)(dao)(dao)(dao)軌之(zhi)(zhi)間無限滾(gun)動(dong)(dong)循環， 從而使負(fu)(fu)載(zai)平(ping)臺沿著導(dao)(dao)(dao)(dao)軌輕易(yi)的(de)(de)高(gao)(gao)精(jing)(jing)度線(xian)(xian)性(xing)運(yun)(yun)動(dong)(dong)，并將摩擦系數(shu)降(jiang)至平(ping)常傳統滑動(dong)(dong)導(dao)(dao)(dao)(dao)引(yin)的(de)(de)五十分(fen)之(zhi)(zhi)一，能輕易(yi)地達到很(hen)高(gao)(gao)的(de)(de)定位精(jing)(jing)度。滑塊跟導(dao)(dao)(dao)(dao)軌間末制單元(yuan)設計，使線(xian)(xian)形(xing)導(dao)(dao)(dao)(dao)軌同時承受上下左右等各方向的(de)(de)負(fu)(fu)荷，回流系統及精(jing)(jing)簡化的(de)(de)結構設計讓線(xian)(xian)性(xing)導(dao)(dao)(dao)(dao)軌有更(geng)平(ping)順且低噪(zao)音的(de)(de)運(yun)(yun)動(dong)(dong)。

滑塊-使(shi)運動(dong)由曲線轉變為直線。

直(zhi)(zhi)線導(dao)(dao)軌(gui)主要(yao)是(shi)用(yong)(yong)在(zai)精度(du)要(yao)求(qiu)比較高的(de)機(ji)械(xie)(xie)結構上(shang),直(zhi)(zhi)線導(dao)(dao)軌(gui)的(de)移動元件(jian)和(he)固(gu)定元件(jian)之(zhi)間不用(yong)(yong)中間介質，而(er)用(yong)(yong)滾動鋼球(qiu)。因(yin)為(wei)滾動鋼球(qiu)適應(ying)于高速運動、摩(mo)擦系數小、靈(ling)敏度(du)高，滿(man)足(zu)運動部件(jian)的(de)工作要(yao)求(qiu)，被廣泛應(ying)用(yong)(yong)在(zai)自(zi)動化(hua)(hua)機(ji)械(xie)(xie)上(shang)比較多,像磨(mo)床、銑床、車(che)床、檢(jian)測儀(yi)器設(she)備(bei)、木工機(ji)械(xie)(xie)、搬運機(ji)械(xie)(xie)、傳送(song)裝置、自(zi)動化(hua)(hua)機(ji)械(xie)(xie)、半導(dao)(dao)體機(ji)械(xie)(xie)、包裝機(ji)械(xie)(xie)、機(ji)械(xie)(xie)手臂、自(zi)動化(hua)(hua)機(ji)床、激光行業(ye)(ye)、汽車(che)制造、新(xin)能(neng)源等行業(ye)(ye)。