直線導軌(gui)又(you)稱線軌(gui)、滑軌(gui)、線性導軌(gui)、線性滑軌(gui)，用(yong)于高(gao)精或高(gao)速直線往復運動場合，且(qie)可(ke)以(yi)承擔一定(ding)的扭矩(ju)，可(ke)在高(gao)負載的情況下(xia)實現高(gao)精度的直線運動。

直(zhi)(zhi)(zhi)(zhi)線(xian)(xian)(xian)導(dao)(dao)軌(gui)(gui)運(yun)(yun)(yun)動(dong)的(de)(de)作用(yong)(yong)(yong)是(shi)用(yong)(yong)(yong)來支撐(cheng)和引導(dao)(dao)運(yun)(yun)(yun)動(dong)部(bu)件，按給定(ding)(ding)的(de)(de)方向(xiang)做往復直(zhi)(zhi)(zhi)(zhi)線(xian)(xian)(xian)運(yun)(yun)(yun)動(dong)。　直(zhi)(zhi)(zhi)(zhi)線(xian)(xian)(xian)軸承主要(yao)(yao)用(yong)(yong)(yong)在自(zi)動(dong)化機械上(shang)(shang)比(bi)較多,像直(zhi)(zhi)(zhi)(zhi)線(xian)(xian)(xian)導(dao)(dao)軌(gui)(gui)主要(yao)(yao)是(shi)用(yong)(yong)(yong)在精(jing)度(du)(du)要(yao)(yao)求比(bi)較高(gao)的(de)(de)機械結構上(shang)(shang),直(zhi)(zhi)(zhi)(zhi)線(xian)(xian)(xian)導(dao)(dao)軌(gui)(gui)的(de)(de)移動(dong)元件和固定(ding)(ding)元件之間(jian)不用(yong)(yong)(yong)中間(jian)介質，而(er)用(yong)(yong)(yong)滾動(dong)鋼球。可以理(li)解為是(shi)一種滾動(dong)導(dao)(dao)引，是(shi)由(you)鋼珠在滑(hua)(hua)塊跟導(dao)(dao)軌(gui)(gui)之間(jian)無限滾動(dong)循(xun)環， 從而(er)使負(fu)載平臺沿著導(dao)(dao)軌(gui)(gui)輕易(yi)的(de)(de)高(gao)精(jing)度(du)(du)線(xian)(xian)(xian)性運(yun)(yun)(yun)動(dong)，并將(jiang)摩擦系(xi)數降至平常傳統滑(hua)(hua)動(dong)導(dao)(dao)引的(de)(de)五(wu)十分(fen)之一，能輕易(yi)地達(da)到很(hen)高(gao)的(de)(de)定(ding)(ding)位精(jing)度(du)(du)。滑(hua)(hua)塊跟導(dao)(dao)軌(gui)(gui)間(jian)末制單(dan)元設(she)計(ji)，使線(xian)(xian)(xian)形導(dao)(dao)軌(gui)(gui)同時承受上(shang)(shang)下(xia)左右等各方向(xiang)的(de)(de)負(fu)荷，回流系(xi)統及精(jing)簡化的(de)(de)結構設(she)計(ji)讓線(xian)(xian)(xian)性導(dao)(dao)軌(gui)(gui)有更平順且(qie)低噪音的(de)(de)運(yun)(yun)(yun)動(dong)。

滑塊-使運動由(you)曲(qu)線(xian)轉變為直線(xian)。

直線(xian)(xian)導(dao)軌(gui)(gui)主要是用(yong)(yong)(yong)在精度要求比較(jiao)高(gao)(gao)的機(ji)械(xie)結構上,直線(xian)(xian)導(dao)軌(gui)(gui)的移動(dong)(dong)元件和(he)固定元件之間不用(yong)(yong)(yong)中間介質，而用(yong)(yong)(yong)滾動(dong)(dong)鋼球(qiu)(qiu)。因(yin)為滾動(dong)(dong)鋼球(qiu)(qiu)適應于高(gao)(gao)速運動(dong)(dong)、摩(mo)擦系數小、靈敏度高(gao)(gao)，滿(man)足(zu)運動(dong)(dong)部件的工(gong)作要求，被廣泛(fan)應用(yong)(yong)(yong)在自(zi)動(dong)(dong)化(hua)(hua)機(ji)械(xie)上比較(jiao)多,像磨床、銑床、車(che)床、檢測儀器設(she)備、木工(gong)機(ji)械(xie)、搬運機(ji)械(xie)、傳送裝置、自(zi)動(dong)(dong)化(hua)(hua)機(ji)械(xie)、半導(dao)體機(ji)械(xie)、包裝機(ji)械(xie)、機(ji)械(xie)手臂、自(zi)動(dong)(dong)化(hua)(hua)機(ji)床、激光行(xing)業、汽車(che)制造、新能源等行(xing)業。