直(zhi)線(xian)(xian)(xian)導軌(gui)(gui)又稱線(xian)(xian)(xian)軌(gui)(gui)、滑軌(gui)(gui)、線(xian)(xian)(xian)性(xing)導軌(gui)(gui)、線(xian)(xian)(xian)性(xing)滑軌(gui)(gui)，用(yong)于高(gao)精或(huo)高(gao)速(su)直(zhi)線(xian)(xian)(xian)往復運(yun)動(dong)場合，且可(ke)以承擔(dan)一定的扭(niu)矩(ju)，可(ke)在(zai)高(gao)負載(zai)的情(qing)況下(xia)實(shi)現高(gao)精度的直(zhi)線(xian)(xian)(xian)運(yun)動(dong)。

直線導(dao)(dao)(dao)(dao)軌(gui)運(yun)動(dong)的(de)(de)作用是(shi)(shi)用來支撐和引導(dao)(dao)(dao)(dao)運(yun)動(dong)部件(jian)，按給(gei)定的(de)(de)方向做往復直線運(yun)動(dong)。　直線軸承主要用在(zai)自動(dong)化機(ji)(ji)械(xie)上(shang)(shang)比(bi)較(jiao)(jiao)多,像直線導(dao)(dao)(dao)(dao)軌(gui)主要是(shi)(shi)用在(zai)精度要求比(bi)較(jiao)(jiao)高的(de)(de)機(ji)(ji)械(xie)結構上(shang)(shang),直線導(dao)(dao)(dao)(dao)軌(gui)的(de)(de)移動(dong)元(yuan)(yuan)件(jian)和固(gu)定元(yuan)(yuan)件(jian)之間(jian)不用中間(jian)介質，而用滾(gun)動(dong)鋼(gang)球。可(ke)以理解為(wei)是(shi)(shi)一(yi)種滾(gun)動(dong)導(dao)(dao)(dao)(dao)引，是(shi)(shi)由鋼(gang)珠在(zai)滑塊(kuai)跟導(dao)(dao)(dao)(dao)軌(gui)之間(jian)無限滾(gun)動(dong)循環(huan)， 從而使負載(zai)平臺(tai)沿著導(dao)(dao)(dao)(dao)軌(gui)輕(qing)易的(de)(de)高精度線性運(yun)動(dong)，并(bing)將摩擦系(xi)數降至平常傳(chuan)統(tong)滑動(dong)導(dao)(dao)(dao)(dao)引的(de)(de)五十(shi)分之一(yi)，能輕(qing)易地達(da)到很高的(de)(de)定位精度。滑塊(kuai)跟導(dao)(dao)(dao)(dao)軌(gui)間(jian)末制單元(yuan)(yuan)設(she)計，使線形導(dao)(dao)(dao)(dao)軌(gui)同時承受上(shang)(shang)下左右等各(ge)方向的(de)(de)負荷，回流系(xi)統(tong)及精簡(jian)化的(de)(de)結構設(she)計讓線性導(dao)(dao)(dao)(dao)軌(gui)有(you)更(geng)平順且低噪音的(de)(de)運(yun)動(dong)。

滑塊-使運(yun)動由(you)曲線轉變(bian)為直線。

直線(xian)導軌(gui)主要(yao)是用在(zai)精(jing)度要(yao)求(qiu)比較高(gao)的機(ji)械(xie)(xie)(xie)(xie)結構上,直線(xian)導軌(gui)的移(yi)動(dong)(dong)(dong)元件(jian)(jian)和固定(ding)元件(jian)(jian)之間不用中(zhong)間介質，而用滾(gun)動(dong)(dong)(dong)鋼(gang)球。因為滾(gun)動(dong)(dong)(dong)鋼(gang)球適應于高(gao)速運動(dong)(dong)(dong)、摩擦系數小、靈敏度高(gao)，滿足運動(dong)(dong)(dong)部件(jian)(jian)的工(gong)作要(yao)求(qiu)，被廣泛應用在(zai)自(zi)動(dong)(dong)(dong)化機(ji)械(xie)(xie)(xie)(xie)上比較多,像磨床(chuang)、銑床(chuang)、車床(chuang)、檢測(ce)儀器設備(bei)、木工(gong)機(ji)械(xie)(xie)(xie)(xie)、搬運機(ji)械(xie)(xie)(xie)(xie)、傳送裝置、自(zi)動(dong)(dong)(dong)化機(ji)械(xie)(xie)(xie)(xie)、半導體(ti)機(ji)械(xie)(xie)(xie)(xie)、包(bao)裝機(ji)械(xie)(xie)(xie)(xie)、機(ji)械(xie)(xie)(xie)(xie)手臂、自(zi)動(dong)(dong)(dong)化機(ji)床(chuang)、激光行(xing)業(ye)、汽車制造、新能源(yuan)等行(xing)業(ye)。