直(zhi)線(xian)(xian)導軌(gui)又稱線(xian)(xian)軌(gui)、滑(hua)軌(gui)、線(xian)(xian)性(xing)(xing)導軌(gui)、線(xian)(xian)性(xing)(xing)滑(hua)軌(gui)，用于高精或(huo)高速直(zhi)線(xian)(xian)往(wang)復運動場合，且可以承擔一(yi)定的扭矩，可在(zai)高負載(zai)的情況下(xia)實現高精度的直(zhi)線(xian)(xian)運動。

直線(xian)(xian)(xian)導(dao)(dao)軌(gui)運(yun)動的作(zuo)用是(shi)用來支撐(cheng)和(he)引導(dao)(dao)運(yun)動部(bu)件，按(an)給定(ding)的方向做往復直線(xian)(xian)(xian)運(yun)動。　直線(xian)(xian)(xian)軸承主要用在(zai)自動化(hua)機(ji)械(xie)(xie)上比較(jiao)多,像直線(xian)(xian)(xian)導(dao)(dao)軌(gui)主要是(shi)用在(zai)精(jing)度(du)要求比較(jiao)高的機(ji)械(xie)(xie)結構(gou)上,直線(xian)(xian)(xian)導(dao)(dao)軌(gui)的移動元件和(he)固定(ding)元件之間(jian)(jian)不(bu)用中間(jian)(jian)介質，而(er)(er)用滾動鋼(gang)球。可以理解(jie)為是(shi)一種滾動導(dao)(dao)引，是(shi)由鋼(gang)珠在(zai)滑(hua)(hua)塊跟導(dao)(dao)軌(gui)之間(jian)(jian)無限滾動循環， 從而(er)(er)使負(fu)載平(ping)臺沿著導(dao)(dao)軌(gui)輕易的高精(jing)度(du)線(xian)(xian)(xian)性(xing)運(yun)動，并將(jiang)摩擦系數降至平(ping)常傳(chuan)統滑(hua)(hua)動導(dao)(dao)引的五(wu)十分之一，能輕易地達到很高的定(ding)位精(jing)度(du)。滑(hua)(hua)塊跟導(dao)(dao)軌(gui)間(jian)(jian)末制(zhi)單元設計(ji)，使線(xian)(xian)(xian)形導(dao)(dao)軌(gui)同(tong)時承受(shou)上下左右等各方向的負(fu)荷，回(hui)流系統及精(jing)簡化(hua)的結構(gou)設計(ji)讓線(xian)(xian)(xian)性(xing)導(dao)(dao)軌(gui)有(you)更(geng)平(ping)順且低噪音(yin)的運(yun)動。

滑(hua)塊-使運動(dong)由曲線(xian)轉變為直線(xian)。

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)械(xie)(xie)結構上,直線導軌的移動(dong)(dong)元件(jian)和(he)固定元件(jian)之(zhi)間不(bu)用(yong)中間介質(zhi)，而(er)用(yong)滾(gun)動(dong)(dong)鋼球(qiu)(qiu)。因為滾(gun)動(dong)(dong)鋼球(qiu)(qiu)適應于高速(su)運(yun)(yun)動(dong)(dong)、摩擦(ca)系數小、靈(ling)敏度高，滿(man)足運(yun)(yun)動(dong)(dong)部件(jian)的工(gong)作要(yao)求，被(bei)廣(guang)泛應用(yong)在自動(dong)(dong)化(hua)機(ji)械(xie)(xie)上比較(jiao)多,像(xiang)磨床(chuang)、銑床(chuang)、車床(chuang)、檢測(ce)儀器設備、木工(gong)機(ji)械(xie)(xie)、搬運(yun)(yun)機(ji)械(xie)(xie)、傳(chuan)送裝置、自動(dong)(dong)化(hua)機(ji)械(xie)(xie)、半導體機(ji)械(xie)(xie)、包(bao)裝機(ji)械(xie)(xie)、機(ji)械(xie)(xie)手臂、自動(dong)(dong)化(hua)機(ji)床(chuang)、激光行(xing)業、汽車制(zhi)造、新能源等行(xing)業。