直線(xian)(xian)(xian)導軌(gui)又稱線(xian)(xian)(xian)軌(gui)、滑(hua)軌(gui)、線(xian)(xian)(xian)性(xing)導軌(gui)、線(xian)(xian)(xian)性(xing)滑(hua)軌(gui)，用于(yu)高(gao)(gao)精(jing)或(huo)高(gao)(gao)速(su)直線(xian)(xian)(xian)往復(fu)運動場合，且可以承擔一定的(de)(de)(de)扭矩，可在高(gao)(gao)負載(zai)的(de)(de)(de)情況下實現(xian)高(gao)(gao)精(jing)度的(de)(de)(de)直線(xian)(xian)(xian)運動。

直(zhi)(zhi)線(xian)導(dao)(dao)(dao)(dao)(dao)軌(gui)運(yun)(yun)(yun)(yun)動(dong)(dong)的(de)(de)(de)(de)作用(yong)(yong)(yong)是(shi)(shi)(shi)用(yong)(yong)(yong)來(lai)支(zhi)撐和(he)引(yin)(yin)導(dao)(dao)(dao)(dao)(dao)運(yun)(yun)(yun)(yun)動(dong)(dong)部(bu)件，按給(gei)定的(de)(de)(de)(de)方向做往復直(zhi)(zhi)線(xian)運(yun)(yun)(yun)(yun)動(dong)(dong)。　直(zhi)(zhi)線(xian)軸承主(zhu)要(yao)用(yong)(yong)(yong)在(zai)(zai)自動(dong)(dong)化機(ji)械(xie)上(shang)比較(jiao)(jiao)多,像直(zhi)(zhi)線(xian)導(dao)(dao)(dao)(dao)(dao)軌(gui)主(zhu)要(yao)是(shi)(shi)(shi)用(yong)(yong)(yong)在(zai)(zai)精度(du)要(yao)求(qiu)比較(jiao)(jiao)高(gao)的(de)(de)(de)(de)機(ji)械(xie)結(jie)構(gou)上(shang),直(zhi)(zhi)線(xian)導(dao)(dao)(dao)(dao)(dao)軌(gui)的(de)(de)(de)(de)移(yi)動(dong)(dong)元件和(he)固定元件之間不(bu)用(yong)(yong)(yong)中間介質，而用(yong)(yong)(yong)滾動(dong)(dong)鋼(gang)球。可以理(li)解(jie)為是(shi)(shi)(shi)一種滾動(dong)(dong)導(dao)(dao)(dao)(dao)(dao)引(yin)(yin)，是(shi)(shi)(shi)由(you)鋼(gang)珠在(zai)(zai)滑塊跟導(dao)(dao)(dao)(dao)(dao)軌(gui)之間無(wu)限滾動(dong)(dong)循(xun)環， 從而使負載平(ping)臺(tai)沿著導(dao)(dao)(dao)(dao)(dao)軌(gui)輕易的(de)(de)(de)(de)高(gao)精度(du)線(xian)性運(yun)(yun)(yun)(yun)動(dong)(dong)，并將摩擦系(xi)數降至(zhi)平(ping)常傳統滑動(dong)(dong)導(dao)(dao)(dao)(dao)(dao)引(yin)(yin)的(de)(de)(de)(de)五十分之一，能輕易地(di)達到(dao)很高(gao)的(de)(de)(de)(de)定位精度(du)。滑塊跟導(dao)(dao)(dao)(dao)(dao)軌(gui)間末制單元設計，使線(xian)形導(dao)(dao)(dao)(dao)(dao)軌(gui)同時承受上(shang)下(xia)左右(you)等各方向的(de)(de)(de)(de)負荷，回流系(xi)統及精簡(jian)化的(de)(de)(de)(de)結(jie)構(gou)設計讓線(xian)性導(dao)(dao)(dao)(dao)(dao)軌(gui)有(you)更平(ping)順且低噪音的(de)(de)(de)(de)運(yun)(yun)(yun)(yun)動(dong)(dong)。

滑塊(kuai)-使運動由曲線轉變為直(zhi)線。

直(zhi)線導(dao)軌(gui)主要是用(yong)在精度要求比(bi)較高的(de)機(ji)械(xie)結(jie)構上,直(zhi)線導(dao)軌(gui)的(de)移動(dong)(dong)元件和固(gu)定元件之間不(bu)用(yong)中(zhong)間介質，而用(yong)滾動(dong)(dong)鋼(gang)(gang)球(qiu)。因為滾動(dong)(dong)鋼(gang)(gang)球(qiu)適應(ying)于高速運動(dong)(dong)、摩(mo)擦系數小、靈敏度高，滿足運動(dong)(dong)部件的(de)工(gong)作(zuo)要求，被廣泛應(ying)用(yong)在自(zi)動(dong)(dong)化(hua)機(ji)械(xie)上比(bi)較多,像磨床、銑床、車床、檢測儀器(qi)設備、木(mu)工(gong)機(ji)械(xie)、搬運機(ji)械(xie)、傳送裝(zhuang)置、自(zi)動(dong)(dong)化(hua)機(ji)械(xie)、半導(dao)體機(ji)械(xie)、包裝(zhuang)機(ji)械(xie)、機(ji)械(xie)手(shou)臂、自(zi)動(dong)(dong)化(hua)機(ji)床、激光行(xing)業、汽車制造、新能源等行(xing)業。