直線(xian)(xian)(xian)導軌(gui)又稱(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(gao)精或高(gao)速直線(xian)(xian)(xian)往復運動(dong)場合，且可以承擔一定的(de)(de)扭矩(ju)，可在高(gao)負載的(de)(de)情(qing)況下(xia)實現高(gao)精度的(de)(de)直線(xian)(xian)(xian)運動(dong)。

直(zhi)(zhi)線(xian)(xian)(xian)(xian)(xian)導(dao)(dao)(dao)(dao)軌(gui)運(yun)(yun)動(dong)(dong)的(de)(de)作用(yong)是(shi)用(yong)來支撐和引導(dao)(dao)(dao)(dao)運(yun)(yun)動(dong)(dong)部件(jian)，按(an)給定的(de)(de)方向(xiang)做往復直(zhi)(zhi)線(xian)(xian)(xian)(xian)(xian)運(yun)(yun)動(dong)(dong)。　直(zhi)(zhi)線(xian)(xian)(xian)(xian)(xian)軸(zhou)承(cheng)主要(yao)用(yong)在(zai)自(zi)動(dong)(dong)化(hua)機械上(shang)比(bi)較(jiao)多(duo),像(xiang)直(zhi)(zhi)線(xian)(xian)(xian)(xian)(xian)導(dao)(dao)(dao)(dao)軌(gui)主要(yao)是(shi)用(yong)在(zai)精度(du)要(yao)求(qiu)比(bi)較(jiao)高的(de)(de)機械結(jie)構上(shang),直(zhi)(zhi)線(xian)(xian)(xian)(xian)(xian)導(dao)(dao)(dao)(dao)軌(gui)的(de)(de)移動(dong)(dong)元(yuan)件(jian)和固定元(yuan)件(jian)之間不(bu)用(yong)中(zhong)間介質，而用(yong)滾(gun)動(dong)(dong)鋼球。可以理(li)解為(wei)是(shi)一種(zhong)滾(gun)動(dong)(dong)導(dao)(dao)(dao)(dao)引，是(shi)由鋼珠在(zai)滑(hua)(hua)塊(kuai)跟導(dao)(dao)(dao)(dao)軌(gui)之間無限滾(gun)動(dong)(dong)循(xun)環， 從(cong)而使(shi)負載平臺沿著導(dao)(dao)(dao)(dao)軌(gui)輕易的(de)(de)高精度(du)線(xian)(xian)(xian)(xian)(xian)性(xing)運(yun)(yun)動(dong)(dong)，并將摩擦系(xi)數降至平常傳統滑(hua)(hua)動(dong)(dong)導(dao)(dao)(dao)(dao)引的(de)(de)五十(shi)分之一，能(neng)輕易地達到很(hen)高的(de)(de)定位精度(du)。滑(hua)(hua)塊(kuai)跟導(dao)(dao)(dao)(dao)軌(gui)間末制單元(yuan)設計，使(shi)線(xian)(xian)(xian)(xian)(xian)形導(dao)(dao)(dao)(dao)軌(gui)同時承(cheng)受上(shang)下(xia)左右等(deng)各方向(xiang)的(de)(de)負荷，回流系(xi)統及精簡化(hua)的(de)(de)結(jie)構設計讓線(xian)(xian)(xian)(xian)(xian)性(xing)導(dao)(dao)(dao)(dao)軌(gui)有更平順且低噪(zao)音的(de)(de)運(yun)(yun)動(dong)(dong)。

滑(hua)塊-使運動由曲線轉(zhuan)變為(wei)直線。

直線導(dao)軌(gui)主要(yao)是用在(zai)精度要(yao)求比較高的機械(xie)(xie)(xie)(xie)結構上(shang),直線導(dao)軌(gui)的移(yi)動(dong)(dong)(dong)元件(jian)和固定(ding)元件(jian)之(zhi)間不用中間介(jie)質，而用滾動(dong)(dong)(dong)鋼球(qiu)。因為滾動(dong)(dong)(dong)鋼球(qiu)適(shi)應(ying)于(yu)高速運動(dong)(dong)(dong)、摩擦(ca)系(xi)數小、靈敏度高，滿足運動(dong)(dong)(dong)部件(jian)的工作要(yao)求，被(bei)廣泛(fan)應(ying)用在(zai)自(zi)動(dong)(dong)(dong)化(hua)機械(xie)(xie)(xie)(xie)上(shang)比較多,像磨床(chuang)、銑(xian)床(chuang)、車床(chuang)、檢(jian)測(ce)儀器設備、木工機械(xie)(xie)(xie)(xie)、搬運機械(xie)(xie)(xie)(xie)、傳送裝置(zhi)、自(zi)動(dong)(dong)(dong)化(hua)機械(xie)(xie)(xie)(xie)、半導(dao)體機械(xie)(xie)(xie)(xie)、包裝機械(xie)(xie)(xie)(xie)、機械(xie)(xie)(xie)(xie)手臂(bei)、自(zi)動(dong)(dong)(dong)化(hua)機床(chuang)、激(ji)光(guang)行(xing)業、汽車制(zhi)造、新能(neng)源等行(xing)業。