直線(xian)(xian)導(dao)軌(gui)(gui)又稱線(xian)(xian)軌(gui)(gui)、滑軌(gui)(gui)、線(xian)(xian)性導(dao)軌(gui)(gui)、線(xian)(xian)性滑軌(gui)(gui)，用于高(gao)精(jing)或高(gao)速直線(xian)(xian)往復運動場合，且(qie)可(ke)以(yi)承擔(dan)一定的(de)扭矩，可(ke)在高(gao)負載的(de)情(qing)況下實現高(gao)精(jing)度的(de)直線(xian)(xian)運動。

直(zhi)線導(dao)(dao)(dao)軌(gui)(gui)運動(dong)(dong)(dong)的(de)作用(yong)是(shi)用(yong)來(lai)支撐和(he)引導(dao)(dao)(dao)運動(dong)(dong)(dong)部件，按(an)給定的(de)方向做(zuo)往復直(zhi)線運動(dong)(dong)(dong)。　直(zhi)線軸(zhou)承(cheng)主(zhu)要用(yong)在(zai)(zai)自動(dong)(dong)(dong)化機械上比較多(duo),像直(zhi)線導(dao)(dao)(dao)軌(gui)(gui)主(zhu)要是(shi)用(yong)在(zai)(zai)精(jing)(jing)度要求比較高(gao)的(de)機械結構上,直(zhi)線導(dao)(dao)(dao)軌(gui)(gui)的(de)移動(dong)(dong)(dong)元(yuan)件和(he)固定元(yuan)件之間不用(yong)中間介質(zhi)，而用(yong)滾(gun)動(dong)(dong)(dong)鋼球。可以理解(jie)為是(shi)一種滾(gun)動(dong)(dong)(dong)導(dao)(dao)(dao)引，是(shi)由(you)鋼珠在(zai)(zai)滑塊跟導(dao)(dao)(dao)軌(gui)(gui)之間無限滾(gun)動(dong)(dong)(dong)循環， 從而使負(fu)載(zai)平(ping)(ping)臺(tai)沿著導(dao)(dao)(dao)軌(gui)(gui)輕易的(de)高(gao)精(jing)(jing)度線性運動(dong)(dong)(dong)，并將摩擦系數(shu)降至平(ping)(ping)常傳統滑動(dong)(dong)(dong)導(dao)(dao)(dao)引的(de)五十(shi)分之一，能輕易地達到很高(gao)的(de)定位精(jing)(jing)度。滑塊跟導(dao)(dao)(dao)軌(gui)(gui)間末制單(dan)元(yuan)設計，使線形導(dao)(dao)(dao)軌(gui)(gui)同時承(cheng)受上下左右等(deng)各方向的(de)負(fu)荷，回流(liu)系統及精(jing)(jing)簡化的(de)結構設計讓線性導(dao)(dao)(dao)軌(gui)(gui)有更平(ping)(ping)順且低噪音的(de)運動(dong)(dong)(dong)。

滑塊(kuai)-使運(yun)動(dong)由(you)曲(qu)線轉變為直線。

直線導軌主要是用(yong)(yong)在(zai)精度要求比較高(gao)的機(ji)械(xie)(xie)結構上,直線導軌的移動(dong)(dong)(dong)元件(jian)和固(gu)定元件(jian)之間不用(yong)(yong)中間介質，而(er)用(yong)(yong)滾動(dong)(dong)(dong)鋼(gang)球。因為滾動(dong)(dong)(dong)鋼(gang)球適應于高(gao)速(su)運(yun)(yun)動(dong)(dong)(dong)、摩擦系(xi)數小、靈敏度高(gao)，滿足運(yun)(yun)動(dong)(dong)(dong)部件(jian)的工(gong)(gong)作要求，被廣泛(fan)應用(yong)(yong)在(zai)自(zi)動(dong)(dong)(dong)化(hua)機(ji)械(xie)(xie)上比較多,像磨床、銑(xian)床、車(che)床、檢(jian)測儀器(qi)設(she)備、木工(gong)(gong)機(ji)械(xie)(xie)、搬(ban)運(yun)(yun)機(ji)械(xie)(xie)、傳送(song)裝置、自(zi)動(dong)(dong)(dong)化(hua)機(ji)械(xie)(xie)、半導體機(ji)械(xie)(xie)、包裝機(ji)械(xie)(xie)、機(ji)械(xie)(xie)手臂、自(zi)動(dong)(dong)(dong)化(hua)機(ji)床、激(ji)光行(xing)業、汽車(che)制(zhi)造、新能源等(deng)行(xing)業。