直線(xian)(xian)(xian)(xian)導(dao)軌(gui)又稱線(xian)(xian)(xian)(xian)軌(gui)、滑軌(gui)、線(xian)(xian)(xian)(xian)性導(dao)軌(gui)、線(xian)(xian)(xian)(xian)性滑軌(gui)，用于高(gao)精或高(gao)速直線(xian)(xian)(xian)(xian)往復(fu)運動場(chang)合，且可以承擔一定的扭矩，可在高(gao)負載的情況下(xia)實現高(gao)精度的直線(xian)(xian)(xian)(xian)運動。

直(zhi)(zhi)線導(dao)(dao)(dao)(dao)軌(gui)(gui)(gui)(gui)運動(dong)(dong)的(de)(de)(de)作(zuo)用(yong)是(shi)用(yong)來支撐和引(yin)導(dao)(dao)(dao)(dao)運動(dong)(dong)部(bu)件，按給定(ding)的(de)(de)(de)方向做往復直(zhi)(zhi)線運動(dong)(dong)。　直(zhi)(zhi)線軸承(cheng)主(zhu)要(yao)用(yong)在自動(dong)(dong)化(hua)機(ji)械(xie)上比較多(duo),像(xiang)直(zhi)(zhi)線導(dao)(dao)(dao)(dao)軌(gui)(gui)(gui)(gui)主(zhu)要(yao)是(shi)用(yong)在精度(du)要(yao)求比較高的(de)(de)(de)機(ji)械(xie)結(jie)構上,直(zhi)(zhi)線導(dao)(dao)(dao)(dao)軌(gui)(gui)(gui)(gui)的(de)(de)(de)移動(dong)(dong)元件和固定(ding)元件之(zhi)間(jian)不用(yong)中間(jian)介質(zhi)，而用(yong)滾動(dong)(dong)鋼球。可以(yi)理解(jie)為是(shi)一種滾動(dong)(dong)導(dao)(dao)(dao)(dao)引(yin)，是(shi)由鋼珠在滑(hua)塊跟(gen)導(dao)(dao)(dao)(dao)軌(gui)(gui)(gui)(gui)之(zhi)間(jian)無限滾動(dong)(dong)循(xun)環， 從(cong)而使負(fu)(fu)載平臺沿著導(dao)(dao)(dao)(dao)軌(gui)(gui)(gui)(gui)輕易的(de)(de)(de)高精度(du)線性(xing)運動(dong)(dong)，并(bing)將摩擦系數(shu)降至平常傳統(tong)滑(hua)動(dong)(dong)導(dao)(dao)(dao)(dao)引(yin)的(de)(de)(de)五十(shi)分(fen)之(zhi)一，能輕易地達到很高的(de)(de)(de)定(ding)位精度(du)。滑(hua)塊跟(gen)導(dao)(dao)(dao)(dao)軌(gui)(gui)(gui)(gui)間(jian)末制單(dan)元設(she)計(ji)(ji)，使線形導(dao)(dao)(dao)(dao)軌(gui)(gui)(gui)(gui)同(tong)時承(cheng)受上下左右等各方向的(de)(de)(de)負(fu)(fu)荷，回流系統(tong)及精簡化(hua)的(de)(de)(de)結(jie)構設(she)計(ji)(ji)讓線性(xing)導(dao)(dao)(dao)(dao)軌(gui)(gui)(gui)(gui)有更(geng)平順且(qie)低噪音的(de)(de)(de)運動(dong)(dong)。

滑塊(kuai)-使運(yun)動由曲線(xian)轉(zhuan)變為(wei)直線(xian)。

直線導(dao)軌主要是用在(zai)精度要求比(bi)(bi)較高(gao)的(de)機械(xie)(xie)結構(gou)上,直線導(dao)軌的(de)移動(dong)(dong)(dong)(dong)元件和(he)固定元件之間(jian)不用中間(jian)介質，而(er)用滾動(dong)(dong)(dong)(dong)鋼球。因為滾動(dong)(dong)(dong)(dong)鋼球適(shi)應于高(gao)速運動(dong)(dong)(dong)(dong)、摩擦(ca)系數(shu)小(xiao)、靈敏度高(gao)，滿足(zu)運動(dong)(dong)(dong)(dong)部件的(de)工作要求，被廣泛(fan)應用在(zai)自(zi)動(dong)(dong)(dong)(dong)化機械(xie)(xie)上比(bi)(bi)較多,像磨床(chuang)(chuang)(chuang)、銑床(chuang)(chuang)(chuang)、車(che)床(chuang)(chuang)(chuang)、檢測(ce)儀(yi)器設備、木工機械(xie)(xie)、搬運機械(xie)(xie)、傳(chuan)送裝置、自(zi)動(dong)(dong)(dong)(dong)化機械(xie)(xie)、半(ban)導(dao)體機械(xie)(xie)、包裝機械(xie)(xie)、機械(xie)(xie)手臂、自(zi)動(dong)(dong)(dong)(dong)化機床(chuang)(chuang)(chuang)、激光行業(ye)、汽車(che)制造、新能源等(deng)行業(ye)。