直(zhi)線(xian)導軌(gui)又稱線(xian)軌(gui)、滑(hua)(hua)軌(gui)、線(xian)性導軌(gui)、線(xian)性滑(hua)(hua)軌(gui)，用于高精或高速直(zhi)線(xian)往(wang)復運(yun)動(dong)(dong)場合，且可以承擔一定的(de)扭(niu)矩，可在(zai)高負載(zai)的(de)情況下實(shi)現高精度(du)的(de)直(zhi)線(xian)運(yun)動(dong)(dong)。

直線(xian)導(dao)(dao)(dao)軌(gui)運動(dong)(dong)(dong)(dong)的(de)(de)(de)作(zuo)用(yong)(yong)(yong)是用(yong)(yong)(yong)來支撐和引(yin)導(dao)(dao)(dao)運動(dong)(dong)(dong)(dong)部件(jian)，按給定(ding)的(de)(de)(de)方(fang)向做往復直線(xian)運動(dong)(dong)(dong)(dong)。　直線(xian)軸承主(zhu)要(yao)(yao)用(yong)(yong)(yong)在自動(dong)(dong)(dong)(dong)化機(ji)械上(shang)(shang)比較(jiao)多(duo),像直線(xian)導(dao)(dao)(dao)軌(gui)主(zhu)要(yao)(yao)是用(yong)(yong)(yong)在精度(du)要(yao)(yao)求比較(jiao)高(gao)(gao)的(de)(de)(de)機(ji)械結(jie)構上(shang)(shang),直線(xian)導(dao)(dao)(dao)軌(gui)的(de)(de)(de)移動(dong)(dong)(dong)(dong)元件(jian)和固定(ding)元件(jian)之間(jian)(jian)不用(yong)(yong)(yong)中間(jian)(jian)介質(zhi)，而用(yong)(yong)(yong)滾(gun)動(dong)(dong)(dong)(dong)鋼球。可(ke)以理解為是一種(zhong)滾(gun)動(dong)(dong)(dong)(dong)導(dao)(dao)(dao)引(yin)，是由鋼珠在滑(hua)塊跟導(dao)(dao)(dao)軌(gui)之間(jian)(jian)無限滾(gun)動(dong)(dong)(dong)(dong)循環， 從而使負(fu)(fu)載平臺(tai)沿著導(dao)(dao)(dao)軌(gui)輕易的(de)(de)(de)高(gao)(gao)精度(du)線(xian)性運動(dong)(dong)(dong)(dong)，并將(jiang)摩擦系(xi)數降至平常傳統(tong)滑(hua)動(dong)(dong)(dong)(dong)導(dao)(dao)(dao)引(yin)的(de)(de)(de)五十分之一，能輕易地達(da)到很(hen)高(gao)(gao)的(de)(de)(de)定(ding)位精度(du)。滑(hua)塊跟導(dao)(dao)(dao)軌(gui)間(jian)(jian)末制單元設(she)計，使線(xian)形導(dao)(dao)(dao)軌(gui)同時承受上(shang)(shang)下左右等(deng)各方(fang)向的(de)(de)(de)負(fu)(fu)荷，回流(liu)系(xi)統(tong)及精簡化的(de)(de)(de)結(jie)構設(she)計讓(rang)線(xian)性導(dao)(dao)(dao)軌(gui)有更平順(shun)且低噪音的(de)(de)(de)運動(dong)(dong)(dong)(dong)。

滑(hua)塊-使運(yun)動由曲線(xian)(xian)轉(zhuan)變(bian)為直(zhi)線(xian)(xian)。

直線(xian)導(dao)(dao)(dao)軌(gui)(gui)主要是用在(zai)精度要求比較高(gao)的機(ji)械(xie)(xie)結構上,直線(xian)導(dao)(dao)(dao)軌(gui)(gui)的移動(dong)元(yuan)件和固定元(yuan)件之間不用中間介質，而用滾動(dong)鋼球。因為滾動(dong)鋼球適應(ying)于(yu)高(gao)速運(yun)動(dong)、摩(mo)擦(ca)系數小、靈敏度高(gao)，滿足運(yun)動(dong)部件的工(gong)作要求，被廣泛應(ying)用在(zai)自(zi)(zi)動(dong)化(hua)機(ji)械(xie)(xie)上比較多,像磨(mo)床、銑床、車(che)床、檢測(ce)儀器設備、木工(gong)機(ji)械(xie)(xie)、搬運(yun)機(ji)械(xie)(xie)、傳送裝(zhuang)置、自(zi)(zi)動(dong)化(hua)機(ji)械(xie)(xie)、半導(dao)(dao)(dao)體機(ji)械(xie)(xie)、包裝(zhuang)機(ji)械(xie)(xie)、機(ji)械(xie)(xie)手臂、自(zi)(zi)動(dong)化(hua)機(ji)床、激(ji)光行(xing)業、汽車(che)制(zhi)造、新能源(yuan)等行(xing)業。