直線(xian)導(dao)軌(gui)又稱線(xian)軌(gui)、滑軌(gui)、線(xian)性(xing)導(dao)軌(gui)、線(xian)性(xing)滑軌(gui)，用于高(gao)(gao)(gao)精或高(gao)(gao)(gao)速(su)直線(xian)往復運(yun)動場合，且(qie)可(ke)以承擔一定的(de)(de)扭矩，可(ke)在高(gao)(gao)(gao)負載的(de)(de)情況下實現(xian)高(gao)(gao)(gao)精度的(de)(de)直線(xian)運(yun)動。

直(zhi)線(xian)(xian)(xian)導(dao)(dao)軌運(yun)(yun)(yun)動(dong)(dong)的(de)(de)作用(yong)是用(yong)來支撐(cheng)和(he)引導(dao)(dao)運(yun)(yun)(yun)動(dong)(dong)部件(jian)，按給定的(de)(de)方向做往復(fu)直(zhi)線(xian)(xian)(xian)運(yun)(yun)(yun)動(dong)(dong)。　直(zhi)線(xian)(xian)(xian)軸承主(zhu)(zhu)要用(yong)在(zai)自動(dong)(dong)化機械(xie)上比較多,像直(zhi)線(xian)(xian)(xian)導(dao)(dao)軌主(zhu)(zhu)要是用(yong)在(zai)精(jing)(jing)度要求比較高(gao)的(de)(de)機械(xie)結構上,直(zhi)線(xian)(xian)(xian)導(dao)(dao)軌的(de)(de)移動(dong)(dong)元(yuan)件(jian)和(he)固定元(yuan)件(jian)之(zhi)(zhi)間不用(yong)中間介質，而用(yong)滾動(dong)(dong)鋼(gang)球。可以(yi)理解(jie)為是一種滾動(dong)(dong)導(dao)(dao)引，是由(you)鋼(gang)珠在(zai)滑塊跟導(dao)(dao)軌之(zhi)(zhi)間無限(xian)滾動(dong)(dong)循環， 從而使負(fu)載平(ping)臺(tai)沿著導(dao)(dao)軌輕(qing)易的(de)(de)高(gao)精(jing)(jing)度線(xian)(xian)(xian)性運(yun)(yun)(yun)動(dong)(dong)，并將摩擦系數降至平(ping)常(chang)傳統滑動(dong)(dong)導(dao)(dao)引的(de)(de)五(wu)十(shi)分之(zhi)(zhi)一，能輕(qing)易地達到(dao)很高(gao)的(de)(de)定位精(jing)(jing)度。滑塊跟導(dao)(dao)軌間末制單元(yuan)設(she)(she)計，使線(xian)(xian)(xian)形導(dao)(dao)軌同(tong)時承受上下左(zuo)右等各(ge)方向的(de)(de)負(fu)荷，回流系統及精(jing)(jing)簡化的(de)(de)結構設(she)(she)計讓線(xian)(xian)(xian)性導(dao)(dao)軌有更平(ping)順且低噪音(yin)的(de)(de)運(yun)(yun)(yun)動(dong)(dong)。

滑塊-使運(yun)動由曲線轉變為直線。

直線導(dao)軌主要是用在(zai)精度(du)要求(qiu)比較高的機(ji)械(xie)結構上,直線導(dao)軌的移動(dong)(dong)元件和(he)固定元件之間不用中間介質，而用滾動(dong)(dong)鋼球。因為滾動(dong)(dong)鋼球適應于高速運(yun)動(dong)(dong)、摩擦系數小、靈(ling)敏度(du)高，滿足運(yun)動(dong)(dong)部件的工作要求(qiu)，被廣泛應用在(zai)自動(dong)(dong)化機(ji)械(xie)上比較多,像(xiang)磨床(chuang)、銑床(chuang)、車床(chuang)、檢測儀器設備、木工機(ji)械(xie)、搬運(yun)機(ji)械(xie)、傳(chuan)送裝置、自動(dong)(dong)化機(ji)械(xie)、半導(dao)體機(ji)械(xie)、包(bao)裝機(ji)械(xie)、機(ji)械(xie)手臂、自動(dong)(dong)化機(ji)床(chuang)、激光(guang)行業(ye)、汽(qi)車制造、新(xin)能(neng)源(yuan)等行業(ye)。