直(zhi)線(xian)(xian)導軌(gui)又稱(cheng)線(xian)(xian)軌(gui)、滑軌(gui)、線(xian)(xian)性導軌(gui)、線(xian)(xian)性滑軌(gui)，用于高(gao)精或高(gao)速直(zhi)線(xian)(xian)往復運動(dong)場合(he)，且可以承(cheng)擔一定的扭矩，可在(zai)高(gao)負載(zai)的情況(kuang)下實(shi)現高(gao)精度的直(zhi)線(xian)(xian)運動(dong)。

直(zhi)(zhi)線(xian)(xian)導軌運(yun)(yun)動(dong)的作用(yong)(yong)(yong)是(shi)(shi)用(yong)(yong)(yong)來支撐和引(yin)導運(yun)(yun)動(dong)部件，按給定的方向做(zuo)往復直(zhi)(zhi)線(xian)(xian)運(yun)(yun)動(dong)。　直(zhi)(zhi)線(xian)(xian)軸承主要用(yong)(yong)(yong)在自動(dong)化機(ji)械(xie)(xie)上(shang)(shang)比較多(duo),像直(zhi)(zhi)線(xian)(xian)導軌主要是(shi)(shi)用(yong)(yong)(yong)在精度(du)要求比較高的機(ji)械(xie)(xie)結構上(shang)(shang),直(zhi)(zhi)線(xian)(xian)導軌的移動(dong)元件和固定元件之(zhi)間(jian)不用(yong)(yong)(yong)中間(jian)介質(zhi)，而用(yong)(yong)(yong)滾動(dong)鋼(gang)球。可(ke)以(yi)理(li)解為是(shi)(shi)一種(zhong)滾動(dong)導引(yin)，是(shi)(shi)由鋼(gang)珠在滑塊(kuai)跟導軌之(zhi)間(jian)無限(xian)滾動(dong)循環， 從(cong)而使負載平(ping)(ping)臺沿著(zhu)導軌輕(qing)易的高精度(du)線(xian)(xian)性運(yun)(yun)動(dong)，并將摩擦系數(shu)降至平(ping)(ping)常傳統滑動(dong)導引(yin)的五十分之(zhi)一，能輕(qing)易地達(da)到(dao)很高的定位(wei)精度(du)。滑塊(kuai)跟導軌間(jian)末制(zhi)單元設(she)計，使線(xian)(xian)形導軌同(tong)時承受上(shang)(shang)下左右等(deng)各(ge)方向的負荷，回流系統及精簡(jian)化的結構設(she)計讓線(xian)(xian)性導軌有(you)更(geng)平(ping)(ping)順且低(di)噪(zao)音(yin)的運(yun)(yun)動(dong)。

滑(hua)塊(kuai)-使運動由(you)曲(qu)線(xian)轉(zhuan)變(bian)為直線(xian)。

直(zhi)線導(dao)軌主(zhu)要(yao)是用在精度(du)要(yao)求比(bi)較高的(de)機械(xie)(xie)結構上(shang),直(zhi)線導(dao)軌的(de)移動(dong)(dong)元件和固定元件之間(jian)不用中間(jian)介質，而用滾(gun)動(dong)(dong)鋼球(qiu)。因為(wei)滾(gun)動(dong)(dong)鋼球(qiu)適應于高速運動(dong)(dong)、摩擦系數小、靈(ling)敏度(du)高，滿(man)足運動(dong)(dong)部件的(de)工(gong)(gong)作要(yao)求，被(bei)廣泛應用在自動(dong)(dong)化機械(xie)(xie)上(shang)比(bi)較多,像(xiang)磨(mo)床(chuang)(chuang)、銑床(chuang)(chuang)、車床(chuang)(chuang)、檢測(ce)儀器設備、木(mu)工(gong)(gong)機械(xie)(xie)、搬運機械(xie)(xie)、傳送(song)裝(zhuang)置、自動(dong)(dong)化機械(xie)(xie)、半導(dao)體機械(xie)(xie)、包裝(zhuang)機械(xie)(xie)、機械(xie)(xie)手(shou)臂、自動(dong)(dong)化機床(chuang)(chuang)、激(ji)光行業、汽車制造、新能(neng)源等行業。