直線(xian)(xian)(xian)導軌(gui)又(you)稱(cheng)線(xian)(xian)(xian)軌(gui)、滑軌(gui)、線(xian)(xian)(xian)性導軌(gui)、線(xian)(xian)(xian)性滑軌(gui)，用(yong)于高精或(huo)高速直線(xian)(xian)(xian)往復(fu)運動場合，且可以承擔一定的扭矩，可在高負(fu)載的情況下(xia)實(shi)現(xian)高精度(du)的直線(xian)(xian)(xian)運動。

直(zhi)(zhi)線(xian)(xian)(xian)導(dao)(dao)(dao)(dao)軌(gui)運(yun)動(dong)(dong)的作用(yong)是(shi)用(yong)來支撐和(he)引導(dao)(dao)(dao)(dao)運(yun)動(dong)(dong)部件(jian)，按給定(ding)的方向(xiang)做往復(fu)直(zhi)(zhi)線(xian)(xian)(xian)運(yun)動(dong)(dong)。　直(zhi)(zhi)線(xian)(xian)(xian)軸承主要(yao)用(yong)在自(zi)動(dong)(dong)化機械(xie)上比較多,像直(zhi)(zhi)線(xian)(xian)(xian)導(dao)(dao)(dao)(dao)軌(gui)主要(yao)是(shi)用(yong)在精(jing)度(du)要(yao)求比較高(gao)的機械(xie)結構上,直(zhi)(zhi)線(xian)(xian)(xian)導(dao)(dao)(dao)(dao)軌(gui)的移動(dong)(dong)元件(jian)和(he)固(gu)定(ding)元件(jian)之間不用(yong)中(zhong)間介質，而用(yong)滾(gun)動(dong)(dong)鋼球。可以(yi)理解為(wei)是(shi)一(yi)種滾(gun)動(dong)(dong)導(dao)(dao)(dao)(dao)引，是(shi)由鋼珠(zhu)在滑(hua)塊(kuai)(kuai)跟導(dao)(dao)(dao)(dao)軌(gui)之間無限滾(gun)動(dong)(dong)循環， 從而使(shi)(shi)負載平臺沿著導(dao)(dao)(dao)(dao)軌(gui)輕(qing)易(yi)的高(gao)精(jing)度(du)線(xian)(xian)(xian)性運(yun)動(dong)(dong)，并將摩(mo)擦系(xi)數降至平常傳統滑(hua)動(dong)(dong)導(dao)(dao)(dao)(dao)引的五十分之一(yi)，能輕(qing)易(yi)地(di)達到(dao)很(hen)高(gao)的定(ding)位精(jing)度(du)。滑(hua)塊(kuai)(kuai)跟導(dao)(dao)(dao)(dao)軌(gui)間末制單元設計，使(shi)(shi)線(xian)(xian)(xian)形(xing)導(dao)(dao)(dao)(dao)軌(gui)同時(shi)承受上下左右等各方向(xiang)的負荷，回流系(xi)統及精(jing)簡(jian)化的結構設計讓線(xian)(xian)(xian)性導(dao)(dao)(dao)(dao)軌(gui)有更(geng)平順且低噪(zao)音的運(yun)動(dong)(dong)。

滑塊-使運動(dong)由曲線轉變為直(zhi)線。

直線導(dao)軌(gui)主要是用(yong)在(zai)精度要求(qiu)比(bi)(bi)較高的機(ji)(ji)械(xie)(xie)結(jie)構(gou)上,直線導(dao)軌(gui)的移動(dong)(dong)元件和固定元件之(zhi)間不用(yong)中間介質，而(er)用(yong)滾動(dong)(dong)鋼(gang)球。因為(wei)滾動(dong)(dong)鋼(gang)球適應于高速運(yun)動(dong)(dong)、摩(mo)擦(ca)系數小、靈(ling)敏度高，滿足運(yun)動(dong)(dong)部件的工(gong)作要求(qiu)，被(bei)廣泛應用(yong)在(zai)自動(dong)(dong)化機(ji)(ji)械(xie)(xie)上比(bi)(bi)較多,像磨床(chuang)、銑床(chuang)、車(che)床(chuang)、檢(jian)測儀器設備、木工(gong)機(ji)(ji)械(xie)(xie)、搬運(yun)機(ji)(ji)械(xie)(xie)、傳送裝(zhuang)(zhuang)置(zhi)、自動(dong)(dong)化機(ji)(ji)械(xie)(xie)、半(ban)導(dao)體機(ji)(ji)械(xie)(xie)、包裝(zhuang)(zhuang)機(ji)(ji)械(xie)(xie)、機(ji)(ji)械(xie)(xie)手臂、自動(dong)(dong)化機(ji)(ji)床(chuang)、激光(guang)行業(ye)、汽車(che)制造、新能源等行業(ye)。