直(zhi)線(xian)導軌(gui)(gui)又稱線(xian)軌(gui)(gui)、滑(hua)軌(gui)(gui)、線(xian)性導軌(gui)(gui)、線(xian)性滑(hua)軌(gui)(gui)，用于高(gao)(gao)精或高(gao)(gao)速直(zhi)線(xian)往復運(yun)動(dong)場(chang)合(he)，且可(ke)(ke)以承擔一(yi)定(ding)的(de)扭矩，可(ke)(ke)在高(gao)(gao)負載的(de)情況下(xia)實現高(gao)(gao)精度的(de)直(zhi)線(xian)運(yun)動(dong)。

直(zhi)線(xian)導(dao)軌(gui)(gui)(gui)運動(dong)(dong)(dong)(dong)的(de)(de)(de)(de)作用(yong)是(shi)用(yong)來(lai)支撐和(he)引(yin)導(dao)運動(dong)(dong)(dong)(dong)部件，按給定(ding)的(de)(de)(de)(de)方向(xiang)做往復直(zhi)線(xian)運動(dong)(dong)(dong)(dong)。　直(zhi)線(xian)軸承主要用(yong)在(zai)(zai)自動(dong)(dong)(dong)(dong)化(hua)機械上比較多,像直(zhi)線(xian)導(dao)軌(gui)(gui)(gui)主要是(shi)用(yong)在(zai)(zai)精度(du)(du)要求比較高(gao)的(de)(de)(de)(de)機械結構(gou)上,直(zhi)線(xian)導(dao)軌(gui)(gui)(gui)的(de)(de)(de)(de)移(yi)動(dong)(dong)(dong)(dong)元(yuan)件和(he)固定(ding)元(yuan)件之間不用(yong)中間介質，而用(yong)滾動(dong)(dong)(dong)(dong)鋼球(qiu)。可以理解(jie)為是(shi)一種滾動(dong)(dong)(dong)(dong)導(dao)引(yin)，是(shi)由鋼珠(zhu)在(zai)(zai)滑塊(kuai)跟(gen)導(dao)軌(gui)(gui)(gui)之間無限(xian)滾動(dong)(dong)(dong)(dong)循(xun)環， 從而使負載平臺沿著導(dao)軌(gui)(gui)(gui)輕(qing)易的(de)(de)(de)(de)高(gao)精度(du)(du)線(xian)性(xing)運動(dong)(dong)(dong)(dong)，并將摩擦系數(shu)降至平常傳統滑動(dong)(dong)(dong)(dong)導(dao)引(yin)的(de)(de)(de)(de)五十(shi)分之一，能(neng)輕(qing)易地達到很(hen)高(gao)的(de)(de)(de)(de)定(ding)位精度(du)(du)。滑塊(kuai)跟(gen)導(dao)軌(gui)(gui)(gui)間末制單元(yuan)設計(ji)，使線(xian)形導(dao)軌(gui)(gui)(gui)同時(shi)承受上下左右(you)等各(ge)方向(xiang)的(de)(de)(de)(de)負荷，回流系統及精簡化(hua)的(de)(de)(de)(de)結構(gou)設計(ji)讓線(xian)性(xing)導(dao)軌(gui)(gui)(gui)有更平順(shun)且低噪音的(de)(de)(de)(de)運動(dong)(dong)(dong)(dong)。

滑塊-使運動由曲線轉變為(wei)直線。

直線導軌主(zhu)要(yao)是用(yong)(yong)(yong)在(zai)精度要(yao)求比較高(gao)的機(ji)(ji)械(xie)結構上,直線導軌的移(yi)動元件和固定元件之間(jian)不用(yong)(yong)(yong)中間(jian)介質(zhi)，而用(yong)(yong)(yong)滾(gun)動鋼球。因為(wei)滾(gun)動鋼球適(shi)應于高(gao)速運(yun)動、摩擦系數(shu)小、靈敏(min)度高(gao)，滿足運(yun)動部件的工(gong)作要(yao)求，被(bei)廣泛應用(yong)(yong)(yong)在(zai)自(zi)動化(hua)(hua)機(ji)(ji)械(xie)上比較多,像磨床、銑床、車床、檢測(ce)儀(yi)器設備、木工(gong)機(ji)(ji)械(xie)、搬運(yun)機(ji)(ji)械(xie)、傳送裝(zhuang)置、自(zi)動化(hua)(hua)機(ji)(ji)械(xie)、半導體機(ji)(ji)械(xie)、包裝(zhuang)機(ji)(ji)械(xie)、機(ji)(ji)械(xie)手臂、自(zi)動化(hua)(hua)機(ji)(ji)床、激光行(xing)業、汽車制造、新能源等(deng)行(xing)業。