直(zhi)(zhi)線(xian)(xian)(xian)導(dao)軌又(you)稱線(xian)(xian)(xian)軌、滑軌、線(xian)(xian)(xian)性導(dao)軌、線(xian)(xian)(xian)性滑軌，用于高精或高速直(zhi)(zhi)線(xian)(xian)(xian)往(wang)復運(yun)動場(chang)合(he)，且可以(yi)承擔一定的(de)扭矩，可在高負載的(de)情(qing)況下實現高精度的(de)直(zhi)(zhi)線(xian)(xian)(xian)運(yun)動。

直(zhi)線(xian)(xian)(xian)導(dao)(dao)軌(gui)運(yun)動(dong)(dong)的(de)(de)作(zuo)用(yong)(yong)是用(yong)(yong)來支撐和引導(dao)(dao)運(yun)動(dong)(dong)部件(jian)，按給定的(de)(de)方向做往復直(zhi)線(xian)(xian)(xian)運(yun)動(dong)(dong)。　直(zhi)線(xian)(xian)(xian)軸承主要用(yong)(yong)在(zai)(zai)自動(dong)(dong)化(hua)機械上比較(jiao)多(duo),像(xiang)直(zhi)線(xian)(xian)(xian)導(dao)(dao)軌(gui)主要是用(yong)(yong)在(zai)(zai)精(jing)度要求(qiu)比較(jiao)高(gao)的(de)(de)機械結構(gou)上,直(zhi)線(xian)(xian)(xian)導(dao)(dao)軌(gui)的(de)(de)移動(dong)(dong)元(yuan)件(jian)和固定元(yuan)件(jian)之間不用(yong)(yong)中間介質，而(er)用(yong)(yong)滾動(dong)(dong)鋼(gang)球。可以(yi)理解為(wei)是一種滾動(dong)(dong)導(dao)(dao)引，是由鋼(gang)珠在(zai)(zai)滑(hua)塊跟導(dao)(dao)軌(gui)之間無限(xian)滾動(dong)(dong)循環， 從而(er)使負載(zai)平臺沿著導(dao)(dao)軌(gui)輕(qing)易的(de)(de)高(gao)精(jing)度線(xian)(xian)(xian)性運(yun)動(dong)(dong)，并將(jiang)摩擦系數降(jiang)至平常傳統滑(hua)動(dong)(dong)導(dao)(dao)引的(de)(de)五(wu)十(shi)分(fen)之一，能輕(qing)易地達到很(hen)高(gao)的(de)(de)定位精(jing)度。滑(hua)塊跟導(dao)(dao)軌(gui)間末制單元(yuan)設計，使線(xian)(xian)(xian)形導(dao)(dao)軌(gui)同時(shi)承受上下左(zuo)右等各方向的(de)(de)負荷，回流系統及(ji)精(jing)簡化(hua)的(de)(de)結構(gou)設計讓線(xian)(xian)(xian)性導(dao)(dao)軌(gui)有更(geng)平順(shun)且低噪音的(de)(de)運(yun)動(dong)(dong)。

滑塊-使運動(dong)由曲線轉變為直線。

直線(xian)導(dao)軌主要是(shi)用(yong)在精度要求比較(jiao)高的(de)機(ji)(ji)(ji)械(xie)(xie)結構上,直線(xian)導(dao)軌的(de)移動(dong)(dong)(dong)元(yuan)件(jian)和(he)固定元(yuan)件(jian)之(zhi)間(jian)不用(yong)中間(jian)介(jie)質，而用(yong)滾動(dong)(dong)(dong)鋼(gang)(gang)球。因(yin)為(wei)滾動(dong)(dong)(dong)鋼(gang)(gang)球適應(ying)于高速(su)運動(dong)(dong)(dong)、摩擦(ca)系數小、靈敏(min)度高，滿足運動(dong)(dong)(dong)部(bu)件(jian)的(de)工作要求，被廣泛應(ying)用(yong)在自(zi)(zi)動(dong)(dong)(dong)化(hua)機(ji)(ji)(ji)械(xie)(xie)上比較(jiao)多,像磨床、銑床、車床、檢測儀器設備(bei)、木工機(ji)(ji)(ji)械(xie)(xie)、搬運機(ji)(ji)(ji)械(xie)(xie)、傳送裝(zhuang)置、自(zi)(zi)動(dong)(dong)(dong)化(hua)機(ji)(ji)(ji)械(xie)(xie)、半導(dao)體機(ji)(ji)(ji)械(xie)(xie)、包裝(zhuang)機(ji)(ji)(ji)械(xie)(xie)、機(ji)(ji)(ji)械(xie)(xie)手臂、自(zi)(zi)動(dong)(dong)(dong)化(hua)機(ji)(ji)(ji)床、激(ji)光行業(ye)、汽(qi)車制造、新能源等(deng)行業(ye)。