直線(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)，用于高精或高速直線(xian)往復運動場合，且可以(yi)承擔一定(ding)的(de)(de)(de)扭矩，可在高負(fu)載的(de)(de)(de)情況下實現高精度的(de)(de)(de)直線(xian)運動。

直(zhi)(zhi)線(xian)導(dao)(dao)(dao)軌(gui)(gui)(gui)(gui)運動(dong)(dong)的(de)作用(yong)是用(yong)來支撐和引(yin)導(dao)(dao)(dao)運動(dong)(dong)部件(jian)，按給定(ding)的(de)方向(xiang)做往復(fu)直(zhi)(zhi)線(xian)運動(dong)(dong)。　直(zhi)(zhi)線(xian)軸承主要用(yong)在自動(dong)(dong)化機(ji)械(xie)(xie)上(shang)比較(jiao)多,像(xiang)直(zhi)(zhi)線(xian)導(dao)(dao)(dao)軌(gui)(gui)(gui)(gui)主要是用(yong)在精度要求(qiu)比較(jiao)高的(de)機(ji)械(xie)(xie)結(jie)構上(shang),直(zhi)(zhi)線(xian)導(dao)(dao)(dao)軌(gui)(gui)(gui)(gui)的(de)移(yi)動(dong)(dong)元件(jian)和固定(ding)元件(jian)之(zhi)間(jian)不用(yong)中間(jian)介質，而(er)用(yong)滾(gun)動(dong)(dong)鋼(gang)球。可以理(li)解為是一(yi)種滾(gun)動(dong)(dong)導(dao)(dao)(dao)引(yin)，是由鋼(gang)珠在滑(hua)塊(kuai)(kuai)跟導(dao)(dao)(dao)軌(gui)(gui)(gui)(gui)之(zhi)間(jian)無限滾(gun)動(dong)(dong)循環， 從而(er)使(shi)負載平臺沿著導(dao)(dao)(dao)軌(gui)(gui)(gui)(gui)輕(qing)易(yi)的(de)高精度線(xian)性(xing)運動(dong)(dong)，并(bing)將(jiang)摩(mo)擦系(xi)數降(jiang)至(zhi)平常傳(chuan)統滑(hua)動(dong)(dong)導(dao)(dao)(dao)引(yin)的(de)五十分之(zhi)一(yi)，能輕(qing)易(yi)地達到很高的(de)定(ding)位精度。滑(hua)塊(kuai)(kuai)跟導(dao)(dao)(dao)軌(gui)(gui)(gui)(gui)間(jian)末制單元設(she)計(ji)，使(shi)線(xian)形(xing)導(dao)(dao)(dao)軌(gui)(gui)(gui)(gui)同時承受上(shang)下左(zuo)右等各方向(xiang)的(de)負荷(he)，回流系(xi)統及精簡化的(de)結(jie)構設(she)計(ji)讓線(xian)性(xing)導(dao)(dao)(dao)軌(gui)(gui)(gui)(gui)有更平順且低(di)噪音的(de)運動(dong)(dong)。

滑塊-使運動(dong)由曲線轉變為(wei)直線。

直線導軌主要是用(yong)在精度要求(qiu)比較(jiao)高(gao)(gao)的(de)(de)機(ji)(ji)(ji)械(xie)(xie)(xie)結(jie)構上,直線導軌的(de)(de)移動(dong)(dong)(dong)元(yuan)件(jian)和固定元(yuan)件(jian)之間(jian)不用(yong)中間(jian)介質，而用(yong)滾動(dong)(dong)(dong)鋼球。因為滾動(dong)(dong)(dong)鋼球適應于高(gao)(gao)速(su)運(yun)動(dong)(dong)(dong)、摩擦系數小(xiao)、靈敏度高(gao)(gao)，滿足運(yun)動(dong)(dong)(dong)部(bu)件(jian)的(de)(de)工作(zuo)要求(qiu)，被廣泛應用(yong)在自(zi)動(dong)(dong)(dong)化機(ji)(ji)(ji)械(xie)(xie)(xie)上比較(jiao)多(duo),像磨(mo)床(chuang)、銑床(chuang)、車(che)床(chuang)、檢測儀器(qi)設備、木工機(ji)(ji)(ji)械(xie)(xie)(xie)、搬運(yun)機(ji)(ji)(ji)械(xie)(xie)(xie)、傳(chuan)送裝置、自(zi)動(dong)(dong)(dong)化機(ji)(ji)(ji)械(xie)(xie)(xie)、半(ban)導體機(ji)(ji)(ji)械(xie)(xie)(xie)、包裝機(ji)(ji)(ji)械(xie)(xie)(xie)、機(ji)(ji)(ji)械(xie)(xie)(xie)手(shou)臂、自(zi)動(dong)(dong)(dong)化機(ji)(ji)(ji)床(chuang)、激(ji)光行(xing)業、汽車(che)制造(zao)、新能源等行(xing)業。