直(zhi)線(xian)(xian)(xian)導軌(gui)又稱線(xian)(xian)(xian)軌(gui)、滑軌(gui)、線(xian)(xian)(xian)性(xing)導軌(gui)、線(xian)(xian)(xian)性(xing)滑軌(gui)，用于(yu)高(gao)精(jing)或高(gao)速直(zhi)線(xian)(xian)(xian)往復運動場合，且可(ke)以承擔一定的(de)(de)扭(niu)矩(ju)，可(ke)在高(gao)負載的(de)(de)情況下(xia)實現高(gao)精(jing)度的(de)(de)直(zhi)線(xian)(xian)(xian)運動。

直線(xian)(xian)導(dao)(dao)(dao)軌(gui)(gui)(gui)(gui)運動(dong)(dong)的(de)作(zuo)用(yong)(yong)是(shi)用(yong)(yong)來(lai)支撐(cheng)和引(yin)導(dao)(dao)(dao)運動(dong)(dong)部件，按給定的(de)方向(xiang)做往復(fu)直線(xian)(xian)運動(dong)(dong)。　直線(xian)(xian)軸承主要用(yong)(yong)在自動(dong)(dong)化機械上(shang)(shang)比較(jiao)(jiao)多(duo),像(xiang)直線(xian)(xian)導(dao)(dao)(dao)軌(gui)(gui)(gui)(gui)主要是(shi)用(yong)(yong)在精(jing)度(du)要求比較(jiao)(jiao)高的(de)機械結(jie)構(gou)上(shang)(shang),直線(xian)(xian)導(dao)(dao)(dao)軌(gui)(gui)(gui)(gui)的(de)移動(dong)(dong)元件和固定元件之(zhi)間不用(yong)(yong)中間介質(zhi)，而(er)用(yong)(yong)滾動(dong)(dong)鋼球(qiu)。可以理解為是(shi)一種滾動(dong)(dong)導(dao)(dao)(dao)引(yin)，是(shi)由鋼珠在滑塊跟導(dao)(dao)(dao)軌(gui)(gui)(gui)(gui)之(zhi)間無限滾動(dong)(dong)循(xun)環， 從而(er)使(shi)負載平(ping)(ping)臺沿著導(dao)(dao)(dao)軌(gui)(gui)(gui)(gui)輕易(yi)(yi)的(de)高精(jing)度(du)線(xian)(xian)性運動(dong)(dong)，并將摩擦系數降至(zhi)平(ping)(ping)常傳(chuan)統(tong)滑動(dong)(dong)導(dao)(dao)(dao)引(yin)的(de)五十分之(zhi)一，能輕易(yi)(yi)地達(da)到(dao)很高的(de)定位精(jing)度(du)。滑塊跟導(dao)(dao)(dao)軌(gui)(gui)(gui)(gui)間末(mo)制單元設計(ji)，使(shi)線(xian)(xian)形導(dao)(dao)(dao)軌(gui)(gui)(gui)(gui)同時承受上(shang)(shang)下左右(you)等各方向(xiang)的(de)負荷，回(hui)流系統(tong)及(ji)精(jing)簡(jian)化的(de)結(jie)構(gou)設計(ji)讓線(xian)(xian)性導(dao)(dao)(dao)軌(gui)(gui)(gui)(gui)有更平(ping)(ping)順(shun)且(qie)低噪音的(de)運動(dong)(dong)。

滑塊-使運(yun)動由(you)曲線轉(zhuan)變為直線。

直線(xian)導軌(gui)主要(yao)是用在精(jing)度(du)要(yao)求(qiu)比(bi)較(jiao)高(gao)(gao)的機械(xie)(xie)結構上,直線(xian)導軌(gui)的移動(dong)(dong)元件和固(gu)定元件之間(jian)(jian)不用中間(jian)(jian)介質，而用滾動(dong)(dong)鋼球。因為滾動(dong)(dong)鋼球適應于高(gao)(gao)速運(yun)動(dong)(dong)、摩擦系數小、靈敏度(du)高(gao)(gao)，滿足運(yun)動(dong)(dong)部件的工(gong)作要(yao)求(qiu)，被廣泛應用在自動(dong)(dong)化(hua)機械(xie)(xie)上比(bi)較(jiao)多,像磨床(chuang)、銑床(chuang)、車(che)床(chuang)、檢測儀器設備(bei)、木工(gong)機械(xie)(xie)、搬運(yun)機械(xie)(xie)、傳(chuan)送裝置、自動(dong)(dong)化(hua)機械(xie)(xie)、半導體機械(xie)(xie)、包(bao)裝機械(xie)(xie)、機械(xie)(xie)手(shou)臂(bei)、自動(dong)(dong)化(hua)機床(chuang)、激光行業(ye)、汽車(che)制造、新(xin)能(neng)源等行業(ye)。