直線(xian)導(dao)軌(gui)又稱線(xian)軌(gui)、滑(hua)軌(gui)、線(xian)性導(dao)軌(gui)、線(xian)性滑(hua)軌(gui)，用于高(gao)精或(huo)高(gao)速直線(xian)往復運(yun)動場合，且可(ke)以承(cheng)擔一定(ding)的扭矩，可(ke)在高(gao)負載的情況下實現高(gao)精度(du)的直線(xian)運(yun)動。

直線(xian)導(dao)(dao)(dao)(dao)軌(gui)(gui)運(yun)動(dong)的(de)(de)作用(yong)是(shi)(shi)用(yong)來支(zhi)撐和引(yin)導(dao)(dao)(dao)(dao)運(yun)動(dong)部件，按給定的(de)(de)方(fang)向做(zuo)往復直線(xian)運(yun)動(dong)。　直線(xian)軸承主(zhu)要(yao)用(yong)在自(zi)動(dong)化機(ji)械(xie)上比較多,像直線(xian)導(dao)(dao)(dao)(dao)軌(gui)(gui)主(zhu)要(yao)是(shi)(shi)用(yong)在精度(du)要(yao)求比較高的(de)(de)機(ji)械(xie)結構(gou)上,直線(xian)導(dao)(dao)(dao)(dao)軌(gui)(gui)的(de)(de)移(yi)動(dong)元(yuan)件和固定元(yuan)件之(zhi)間(jian)(jian)不用(yong)中間(jian)(jian)介質，而用(yong)滾動(dong)鋼(gang)球。可以理解為是(shi)(shi)一(yi)種(zhong)滾動(dong)導(dao)(dao)(dao)(dao)引(yin)，是(shi)(shi)由鋼(gang)珠在滑塊(kuai)跟導(dao)(dao)(dao)(dao)軌(gui)(gui)之(zhi)間(jian)(jian)無(wu)限滾動(dong)循(xun)環(huan)， 從(cong)而使負(fu)載平(ping)(ping)臺沿著導(dao)(dao)(dao)(dao)軌(gui)(gui)輕易的(de)(de)高精度(du)線(xian)性運(yun)動(dong)，并(bing)將摩擦系(xi)數降(jiang)至平(ping)(ping)常(chang)傳統(tong)滑動(dong)導(dao)(dao)(dao)(dao)引(yin)的(de)(de)五十分之(zhi)一(yi)，能(neng)輕易地達到很高的(de)(de)定位精度(du)。滑塊(kuai)跟導(dao)(dao)(dao)(dao)軌(gui)(gui)間(jian)(jian)末制單(dan)元(yuan)設計，使線(xian)形導(dao)(dao)(dao)(dao)軌(gui)(gui)同時(shi)承受上下(xia)左右等各方(fang)向的(de)(de)負(fu)荷，回流系(xi)統(tong)及(ji)精簡化的(de)(de)結構(gou)設計讓線(xian)性導(dao)(dao)(dao)(dao)軌(gui)(gui)有更平(ping)(ping)順(shun)且低(di)噪音的(de)(de)運(yun)動(dong)。

滑塊-使運動由曲(qu)線(xian)轉變為直(zhi)線(xian)。

直(zhi)(zhi)線導(dao)軌主要(yao)(yao)是(shi)用(yong)在精度(du)要(yao)(yao)求比較高(gao)的機(ji)(ji)械(xie)(xie)結構上,直(zhi)(zhi)線導(dao)軌的移動(dong)(dong)元(yuan)件和固定元(yuan)件之間(jian)不用(yong)中間(jian)介質，而用(yong)滾動(dong)(dong)鋼球(qiu)。因為滾動(dong)(dong)鋼球(qiu)適應于高(gao)速(su)運(yun)動(dong)(dong)、摩擦系(xi)數小、靈敏度(du)高(gao)，滿足運(yun)動(dong)(dong)部(bu)件的工(gong)作要(yao)(yao)求，被廣泛(fan)應用(yong)在自動(dong)(dong)化機(ji)(ji)械(xie)(xie)上比較多,像磨床(chuang)、銑(xian)床(chuang)、車床(chuang)、檢測儀(yi)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、自動(dong)(dong)化機(ji)(ji)械(xie)(xie)、半(ban)導(dao)體機(ji)(ji)械(xie)(xie)、包(bao)裝機(ji)(ji)械(xie)(xie)、機(ji)(ji)械(xie)(xie)手(shou)臂、自動(dong)(dong)化機(ji)(ji)床(chuang)、激光行(xing)業(ye)、汽車制造、新能源等行(xing)業(ye)。