直線(xian)導(dao)軌(gui)(gui)(gui)又稱線(xian)軌(gui)(gui)(gui)、滑(hua)軌(gui)(gui)(gui)、線(xian)性導(dao)軌(gui)(gui)(gui)、線(xian)性滑(hua)軌(gui)(gui)(gui)，用于高精或高速直線(xian)往復運動(dong)場合，且(qie)可以承擔一定的(de)(de)扭矩(ju)，可在高負(fu)載的(de)(de)情況下實現高精度的(de)(de)直線(xian)運動(dong)。

直(zhi)線導(dao)軌(gui)運(yun)動(dong)(dong)(dong)(dong)的作用(yong)是用(yong)來(lai)支撐(cheng)和引導(dao)運(yun)動(dong)(dong)(dong)(dong)部(bu)件，按(an)給定的方(fang)向做(zuo)往復直(zhi)線運(yun)動(dong)(dong)(dong)(dong)。　直(zhi)線軸承主(zhu)要用(yong)在(zai)自動(dong)(dong)(dong)(dong)化機械(xie)(xie)上(shang)比較多,像直(zhi)線導(dao)軌(gui)主(zhu)要是用(yong)在(zai)精(jing)(jing)度要求(qiu)比較高的機械(xie)(xie)結(jie)構(gou)上(shang),直(zhi)線導(dao)軌(gui)的移動(dong)(dong)(dong)(dong)元件和固定元件之間(jian)(jian)(jian)不用(yong)中間(jian)(jian)(jian)介質，而用(yong)滾動(dong)(dong)(dong)(dong)鋼球。可(ke)以(yi)理解為是一(yi)種滾動(dong)(dong)(dong)(dong)導(dao)引，是由鋼珠在(zai)滑(hua)塊(kuai)跟導(dao)軌(gui)之間(jian)(jian)(jian)無限滾動(dong)(dong)(dong)(dong)循環， 從(cong)而使負載平臺沿著導(dao)軌(gui)輕易(yi)的高精(jing)(jing)度線性運(yun)動(dong)(dong)(dong)(dong)，并(bing)將摩(mo)擦系數降至平常(chang)傳統滑(hua)動(dong)(dong)(dong)(dong)導(dao)引的五十(shi)分之一(yi)，能輕易(yi)地達到很高的定位(wei)精(jing)(jing)度。滑(hua)塊(kuai)跟導(dao)軌(gui)間(jian)(jian)(jian)末制單元設計，使線形導(dao)軌(gui)同時承受(shou)上(shang)下左右等各(ge)方(fang)向的負荷，回流系統及精(jing)(jing)簡化的結(jie)構(gou)設計讓(rang)線性導(dao)軌(gui)有更平順且低噪音的運(yun)動(dong)(dong)(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(shi)用(yong)(yong)在精度(du)要求比(bi)(bi)較(jiao)高的(de)機(ji)械結構上(shang),直(zhi)線導(dao)軌(gui)的(de)移動(dong)元件(jian)和固(gu)定元件(jian)之間不(bu)用(yong)(yong)中間介(jie)質(zhi)，而用(yong)(yong)滾(gun)動(dong)鋼球(qiu)。因為滾(gun)動(dong)鋼球(qiu)適應于高速運(yun)(yun)動(dong)、摩擦系數小(xiao)、靈敏度(du)高，滿足運(yun)(yun)動(dong)部件(jian)的(de)工作要求，被廣(guang)泛應用(yong)(yong)在自動(dong)化(hua)機(ji)械上(shang)比(bi)(bi)較(jiao)多(duo),像磨床(chuang)(chuang)、銑床(chuang)(chuang)、車床(chuang)(chuang)、檢測儀器設(she)備、木工機(ji)械、搬運(yun)(yun)機(ji)械、傳送裝(zhuang)置、自動(dong)化(hua)機(ji)械、半導(dao)體機(ji)械、包(bao)裝(zhuang)機(ji)械、機(ji)械手臂、自動(dong)化(hua)機(ji)床(chuang)(chuang)、激光行業、汽(qi)車制造、新(xin)能源等行業。