直(zhi)線(xian)導(dao)軌(gui)又稱線(xian)軌(gui)、滑軌(gui)、線(xian)性(xing)導(dao)軌(gui)、線(xian)性(xing)滑軌(gui)，用(yong)于高精(jing)或高速直(zhi)線(xian)往(wang)復運動場合，且(qie)可以承擔一定的扭矩，可在高負載的情況(kuang)下(xia)實現高精(jing)度的直(zhi)線(xian)運動。

直(zhi)線(xian)(xian)導軌(gui)(gui)(gui)運(yun)動(dong)的(de)(de)作用(yong)(yong)(yong)是用(yong)(yong)(yong)來支撐(cheng)和(he)引(yin)(yin)導運(yun)動(dong)部件(jian)，按給定的(de)(de)方向做往復直(zhi)線(xian)(xian)運(yun)動(dong)。　直(zhi)線(xian)(xian)軸承(cheng)主要(yao)用(yong)(yong)(yong)在自(zi)動(dong)化機械(xie)(xie)上比較(jiao)多,像直(zhi)線(xian)(xian)導軌(gui)(gui)(gui)主要(yao)是用(yong)(yong)(yong)在精度(du)(du)要(yao)求(qiu)比較(jiao)高(gao)的(de)(de)機械(xie)(xie)結構(gou)上,直(zhi)線(xian)(xian)導軌(gui)(gui)(gui)的(de)(de)移動(dong)元(yuan)件(jian)和(he)固定元(yuan)件(jian)之間(jian)(jian)(jian)不用(yong)(yong)(yong)中間(jian)(jian)(jian)介(jie)質，而用(yong)(yong)(yong)滾(gun)動(dong)鋼球(qiu)。可以理(li)解為是一種滾(gun)動(dong)導引(yin)(yin)，是由鋼珠在滑塊跟(gen)導軌(gui)(gui)(gui)之間(jian)(jian)(jian)無限滾(gun)動(dong)循(xun)環， 從而使(shi)負載平(ping)(ping)臺沿著導軌(gui)(gui)(gui)輕易(yi)的(de)(de)高(gao)精度(du)(du)線(xian)(xian)性運(yun)動(dong)，并將摩擦系數降至平(ping)(ping)常(chang)傳統(tong)滑動(dong)導引(yin)(yin)的(de)(de)五(wu)十(shi)分之一，能輕易(yi)地達(da)到(dao)很高(gao)的(de)(de)定位精度(du)(du)。滑塊跟(gen)導軌(gui)(gui)(gui)間(jian)(jian)(jian)末制單元(yuan)設計，使(shi)線(xian)(xian)形導軌(gui)(gui)(gui)同時(shi)承(cheng)受(shou)上下左右(you)等各方向的(de)(de)負荷，回流系統(tong)及精簡化的(de)(de)結構(gou)設計讓線(xian)(xian)性導軌(gui)(gui)(gui)有更平(ping)(ping)順(shun)且低噪音(yin)的(de)(de)運(yun)動(dong)。

滑塊-使運動由曲線(xian)轉變(bian)為直線(xian)。

直線導(dao)軌主(zhu)要是用(yong)(yong)在精(jing)度(du)要求比較高的機(ji)(ji)械(xie)(xie)結構上,直線導(dao)軌的移動(dong)(dong)元(yuan)件和固(gu)定元(yuan)件之間(jian)(jian)不(bu)用(yong)(yong)中間(jian)(jian)介(jie)質，而用(yong)(yong)滾(gun)動(dong)(dong)鋼(gang)球(qiu)。因為滾(gun)動(dong)(dong)鋼(gang)球(qiu)適(shi)應(ying)于(yu)高速運(yun)動(dong)(dong)、摩擦(ca)系數小、靈敏度(du)高，滿足運(yun)動(dong)(dong)部(bu)件的工作要求，被廣泛(fan)應(ying)用(yong)(yong)在自動(dong)(dong)化機(ji)(ji)械(xie)(xie)上比較多,像(xiang)磨床(chuang)、銑床(chuang)、車床(chuang)、檢(jian)測儀器設備、木(mu)工機(ji)(ji)械(xie)(xie)、搬運(yun)機(ji)(ji)械(xie)(xie)、傳(chuan)送裝置(zhi)、自動(dong)(dong)化機(ji)(ji)械(xie)(xie)、半導(dao)體機(ji)(ji)械(xie)(xie)、包裝機(ji)(ji)械(xie)(xie)、機(ji)(ji)械(xie)(xie)手臂、自動(dong)(dong)化機(ji)(ji)床(chuang)、激光行業、汽車制造(zao)、新能源等行業。