直線(xian)導軌(gui)又稱線(xian)軌(gui)、滑軌(gui)、線(xian)性導軌(gui)、線(xian)性滑軌(gui)，用于高(gao)精(jing)(jing)或高(gao)速直線(xian)往復運動場合，且可(ke)(ke)以承擔(dan)一定的扭(niu)矩，可(ke)(ke)在高(gao)負載的情(qing)況下實現高(gao)精(jing)(jing)度的直線(xian)運動。

直(zhi)線(xian)(xian)導(dao)(dao)軌(gui)運(yun)(yun)動(dong)(dong)(dong)(dong)(dong)的作用是用來支撐和引(yin)導(dao)(dao)運(yun)(yun)動(dong)(dong)(dong)(dong)(dong)部件(jian)，按(an)給定的方(fang)(fang)向(xiang)(xiang)做往復直(zhi)線(xian)(xian)運(yun)(yun)動(dong)(dong)(dong)(dong)(dong)。　直(zhi)線(xian)(xian)軸承主(zhu)要(yao)用在自動(dong)(dong)(dong)(dong)(dong)化(hua)機械上(shang)比(bi)較多(duo),像直(zhi)線(xian)(xian)導(dao)(dao)軌(gui)主(zhu)要(yao)是用在精(jing)度要(yao)求(qiu)比(bi)較高的機械結構上(shang),直(zhi)線(xian)(xian)導(dao)(dao)軌(gui)的移動(dong)(dong)(dong)(dong)(dong)元件(jian)和固定元件(jian)之(zhi)間不用中間介質，而用滾動(dong)(dong)(dong)(dong)(dong)鋼球(qiu)。可以(yi)理(li)解為是一(yi)種滾動(dong)(dong)(dong)(dong)(dong)導(dao)(dao)引(yin)，是由鋼珠在滑塊跟導(dao)(dao)軌(gui)之(zhi)間無(wu)限滾動(dong)(dong)(dong)(dong)(dong)循環， 從而使負載平臺沿著導(dao)(dao)軌(gui)輕易的高精(jing)度線(xian)(xian)性運(yun)(yun)動(dong)(dong)(dong)(dong)(dong)，并將摩擦系數降至平常傳(chuan)統(tong)滑動(dong)(dong)(dong)(dong)(dong)導(dao)(dao)引(yin)的五(wu)十分(fen)之(zhi)一(yi)，能輕易地達到很高的定位精(jing)度。滑塊跟導(dao)(dao)軌(gui)間末制單元設計，使線(xian)(xian)形導(dao)(dao)軌(gui)同(tong)時承受上(shang)下左(zuo)右等各方(fang)(fang)向(xiang)(xiang)的負荷，回流系統(tong)及精(jing)簡化(hua)的結構設計讓(rang)線(xian)(xian)性導(dao)(dao)軌(gui)有更(geng)平順且低(di)噪音的運(yun)(yun)動(dong)(dong)(dong)(dong)(dong)。

滑塊-使(shi)運(yun)動由曲線轉變為直線。

直線導軌主要(yao)是用(yong)在精度要(yao)求比較高(gao)的機(ji)械(xie)結構(gou)上(shang),直線導軌的移(yi)動元件和(he)固定元件之間(jian)不用(yong)中間(jian)介質，而用(yong)滾動鋼球。因為滾動鋼球適應于高(gao)速運(yun)(yun)動、摩擦系數小、靈(ling)敏度高(gao)，滿足運(yun)(yun)動部(bu)件的工(gong)作(zuo)要(yao)求，被廣泛應用(yong)在自動化機(ji)械(xie)上(shang)比較多,像磨床(chuang)、銑(xian)床(chuang)、車床(chuang)、檢測儀器設備、木工(gong)機(ji)械(xie)、搬運(yun)(yun)機(ji)械(xie)、傳(chuan)送裝置、自動化機(ji)械(xie)、半導體機(ji)械(xie)、包裝機(ji)械(xie)、機(ji)械(xie)手臂(bei)、自動化機(ji)床(chuang)、激光(guang)行業、汽車制(zhi)造、新能源等(deng)行業。