直(zhi)(zhi)線(xian)導軌(gui)又稱(cheng)線(xian)軌(gui)、滑(hua)軌(gui)、線(xian)性導軌(gui)、線(xian)性滑(hua)軌(gui)，用于(yu)高(gao)精或高(gao)速直(zhi)(zhi)線(xian)往復運(yun)動(dong)場合，且(qie)可(ke)以承擔一定的扭矩，可(ke)在高(gao)負載(zai)的情況下實現高(gao)精度(du)的直(zhi)(zhi)線(xian)運(yun)動(dong)。

直(zhi)(zhi)(zhi)線導(dao)軌(gui)(gui)(gui)運動(dong)(dong)的(de)(de)(de)作用(yong)是(shi)(shi)用(yong)來(lai)支撐和(he)引導(dao)運動(dong)(dong)部件，按(an)給定(ding)的(de)(de)(de)方(fang)向(xiang)做往復直(zhi)(zhi)(zhi)線運動(dong)(dong)。　直(zhi)(zhi)(zhi)線軸承(cheng)主(zhu)要(yao)用(yong)在自動(dong)(dong)化(hua)機械上比較(jiao)多,像(xiang)直(zhi)(zhi)(zhi)線導(dao)軌(gui)(gui)(gui)主(zhu)要(yao)是(shi)(shi)用(yong)在精度(du)要(yao)求(qiu)比較(jiao)高(gao)的(de)(de)(de)機械結構(gou)上,直(zhi)(zhi)(zhi)線導(dao)軌(gui)(gui)(gui)的(de)(de)(de)移動(dong)(dong)元(yuan)件和(he)固定(ding)元(yuan)件之(zhi)間不用(yong)中(zhong)間介質，而用(yong)滾動(dong)(dong)鋼球。可以理解為(wei)是(shi)(shi)一種滾動(dong)(dong)導(dao)引，是(shi)(shi)由鋼珠在滑塊跟(gen)導(dao)軌(gui)(gui)(gui)之(zhi)間無限(xian)滾動(dong)(dong)循環， 從而使(shi)負載平(ping)臺沿(yan)著(zhu)導(dao)軌(gui)(gui)(gui)輕易(yi)的(de)(de)(de)高(gao)精度(du)線性運動(dong)(dong)，并(bing)將摩(mo)擦系數降至平(ping)常傳統(tong)滑動(dong)(dong)導(dao)引的(de)(de)(de)五(wu)十(shi)分之(zhi)一，能輕易(yi)地達到很高(gao)的(de)(de)(de)定(ding)位精度(du)。滑塊跟(gen)導(dao)軌(gui)(gui)(gui)間末制單元(yuan)設計(ji)，使(shi)線形導(dao)軌(gui)(gui)(gui)同時承(cheng)受上下左右等各方(fang)向(xiang)的(de)(de)(de)負荷，回流系統(tong)及精簡化(hua)的(de)(de)(de)結構(gou)設計(ji)讓線性導(dao)軌(gui)(gui)(gui)有更平(ping)順且低噪音的(de)(de)(de)運動(dong)(dong)。

滑塊(kuai)-使運動(dong)由(you)曲線(xian)轉變(bian)為(wei)直線(xian)。

直線導軌主要(yao)是用在(zai)精度要(yao)求(qiu)比較(jiao)高的機(ji)(ji)械(xie)(xie)結構上,直線導軌的移動(dong)(dong)(dong)元(yuan)件(jian)和(he)固(gu)定(ding)元(yuan)件(jian)之間不用中間介質，而用滾動(dong)(dong)(dong)鋼球。因為滾動(dong)(dong)(dong)鋼球適(shi)應(ying)(ying)于(yu)高速運(yun)動(dong)(dong)(dong)、摩擦(ca)系數小、靈敏度高，滿足運(yun)動(dong)(dong)(dong)部件(jian)的工(gong)作要(yao)求(qiu)，被廣泛應(ying)(ying)用在(zai)自(zi)(zi)動(dong)(dong)(dong)化(hua)機(ji)(ji)械(xie)(xie)上比較(jiao)多,像磨(mo)床、銑(xian)床、車床、檢測儀器設備、木工(gong)機(ji)(ji)械(xie)(xie)、搬運(yun)機(ji)(ji)械(xie)(xie)、傳送裝置、自(zi)(zi)動(dong)(dong)(dong)化(hua)機(ji)(ji)械(xie)(xie)、半導體機(ji)(ji)械(xie)(xie)、包(bao)裝機(ji)(ji)械(xie)(xie)、機(ji)(ji)械(xie)(xie)手臂(bei)、自(zi)(zi)動(dong)(dong)(dong)化(hua)機(ji)(ji)床、激光行業、汽車制造、新(xin)能(neng)源等行業。