直(zhi)線導(dao)軌(gui)(gui)又稱線軌(gui)(gui)、滑軌(gui)(gui)、線性導(dao)軌(gui)(gui)、線性滑軌(gui)(gui)，用于高精或高速(su)直(zhi)線往復運動場合，且可以承擔(dan)一定(ding)的扭(niu)矩，可在高負載的情(qing)況下實現高精度(du)的直(zhi)線運動。

直線(xian)導(dao)(dao)軌(gui)(gui)(gui)運動(dong)(dong)(dong)的(de)作用(yong)(yong)是(shi)(shi)用(yong)(yong)來支撐和引(yin)導(dao)(dao)運動(dong)(dong)(dong)部(bu)件(jian)(jian)，按給定的(de)方(fang)向做往復直線(xian)運動(dong)(dong)(dong)。　直線(xian)軸(zhou)承(cheng)主要(yao)(yao)用(yong)(yong)在自動(dong)(dong)(dong)化(hua)機械上(shang)比較多,像直線(xian)導(dao)(dao)軌(gui)(gui)(gui)主要(yao)(yao)是(shi)(shi)用(yong)(yong)在精(jing)度要(yao)(yao)求(qiu)比較高(gao)的(de)機械結構上(shang),直線(xian)導(dao)(dao)軌(gui)(gui)(gui)的(de)移(yi)動(dong)(dong)(dong)元件(jian)(jian)和固定元件(jian)(jian)之(zhi)(zhi)間不用(yong)(yong)中間介質，而用(yong)(yong)滾(gun)動(dong)(dong)(dong)鋼(gang)球。可以理解為(wei)是(shi)(shi)一(yi)(yi)種滾(gun)動(dong)(dong)(dong)導(dao)(dao)引(yin)，是(shi)(shi)由(you)鋼(gang)珠(zhu)在滑(hua)塊(kuai)跟導(dao)(dao)軌(gui)(gui)(gui)之(zhi)(zhi)間無限滾(gun)動(dong)(dong)(dong)循環， 從而使(shi)負(fu)載平(ping)臺(tai)沿著導(dao)(dao)軌(gui)(gui)(gui)輕易(yi)的(de)高(gao)精(jing)度線(xian)性(xing)運動(dong)(dong)(dong)，并將摩擦系數降至平(ping)常傳統(tong)滑(hua)動(dong)(dong)(dong)導(dao)(dao)引(yin)的(de)五(wu)十分之(zhi)(zhi)一(yi)(yi)，能輕易(yi)地(di)達到很高(gao)的(de)定位精(jing)度。滑(hua)塊(kuai)跟導(dao)(dao)軌(gui)(gui)(gui)間末制單元設計(ji)，使(shi)線(xian)形導(dao)(dao)軌(gui)(gui)(gui)同時承(cheng)受上(shang)下左右(you)等(deng)各方(fang)向的(de)負(fu)荷，回流系統(tong)及精(jing)簡化(hua)的(de)結構設計(ji)讓(rang)線(xian)性(xing)導(dao)(dao)軌(gui)(gui)(gui)有更(geng)平(ping)順(shun)且低噪音的(de)運動(dong)(dong)(dong)。

滑塊-使運動由(you)曲(qu)線轉變為直線。

直(zhi)線(xian)導軌主(zhu)要(yao)(yao)是用(yong)在精度(du)要(yao)(yao)求比較(jiao)高的機(ji)械(xie)(xie)(xie)結構(gou)上(shang),直(zhi)線(xian)導軌的移(yi)動(dong)(dong)元(yuan)件(jian)和固定(ding)元(yuan)件(jian)之間不用(yong)中間介質，而用(yong)滾動(dong)(dong)鋼(gang)球(qiu)。因為滾動(dong)(dong)鋼(gang)球(qiu)適(shi)應于高速運動(dong)(dong)、摩擦系數小(xiao)、靈敏度(du)高，滿足運動(dong)(dong)部件(jian)的工(gong)作要(yao)(yao)求，被(bei)廣泛(fan)應用(yong)在自(zi)動(dong)(dong)化機(ji)械(xie)(xie)(xie)上(shang)比較(jiao)多,像磨床(chuang)、銑床(chuang)、車(che)床(chuang)、檢測儀器設備、木工(gong)機(ji)械(xie)(xie)(xie)、搬運機(ji)械(xie)(xie)(xie)、傳送裝置、自(zi)動(dong)(dong)化機(ji)械(xie)(xie)(xie)、半導體機(ji)械(xie)(xie)(xie)、包(bao)裝機(ji)械(xie)(xie)(xie)、機(ji)械(xie)(xie)(xie)手臂(bei)、自(zi)動(dong)(dong)化機(ji)床(chuang)、激光(guang)行業、汽車(che)制(zhi)造、新能源(yuan)等(deng)行業。