直線(xian)(xian)(xian)導軌(gui)又稱線(xian)(xian)(xian)軌(gui)、滑(hua)(hua)軌(gui)、線(xian)(xian)(xian)性導軌(gui)、線(xian)(xian)(xian)性滑(hua)(hua)軌(gui)，用于高(gao)精或高(gao)速(su)直線(xian)(xian)(xian)往(wang)復(fu)運動(dong)場(chang)合(he)，且可(ke)以承擔一定的(de)扭矩，可(ke)在高(gao)負載的(de)情況(kuang)下實(shi)現高(gao)精度的(de)直線(xian)(xian)(xian)運動(dong)。

直(zhi)(zhi)線導(dao)(dao)(dao)軌(gui)(gui)(gui)(gui)運(yun)(yun)動(dong)(dong)的(de)作用(yong)是用(yong)來支撐和引(yin)導(dao)(dao)(dao)運(yun)(yun)動(dong)(dong)部件，按給定(ding)的(de)方向做往復直(zhi)(zhi)線運(yun)(yun)動(dong)(dong)。　直(zhi)(zhi)線軸承主要(yao)用(yong)在自動(dong)(dong)化(hua)機械上(shang)比較(jiao)(jiao)多,像(xiang)直(zhi)(zhi)線導(dao)(dao)(dao)軌(gui)(gui)(gui)(gui)主要(yao)是用(yong)在精(jing)(jing)度要(yao)求比較(jiao)(jiao)高(gao)的(de)機械結(jie)構上(shang),直(zhi)(zhi)線導(dao)(dao)(dao)軌(gui)(gui)(gui)(gui)的(de)移動(dong)(dong)元(yuan)件和固定(ding)元(yuan)件之間(jian)不用(yong)中間(jian)介質，而(er)用(yong)滾動(dong)(dong)鋼(gang)球。可以(yi)理解(jie)為是一(yi)種滾動(dong)(dong)導(dao)(dao)(dao)引(yin)，是由鋼(gang)珠(zhu)在滑(hua)塊跟(gen)導(dao)(dao)(dao)軌(gui)(gui)(gui)(gui)之間(jian)無限滾動(dong)(dong)循環， 從而(er)使負(fu)載平臺沿著導(dao)(dao)(dao)軌(gui)(gui)(gui)(gui)輕易的(de)高(gao)精(jing)(jing)度線性(xing)運(yun)(yun)動(dong)(dong)，并將摩擦系(xi)數降至平常傳統(tong)滑(hua)動(dong)(dong)導(dao)(dao)(dao)引(yin)的(de)五十分之一(yi)，能(neng)輕易地(di)達到很高(gao)的(de)定(ding)位(wei)精(jing)(jing)度。滑(hua)塊跟(gen)導(dao)(dao)(dao)軌(gui)(gui)(gui)(gui)間(jian)末制單(dan)元(yuan)設計，使線形(xing)導(dao)(dao)(dao)軌(gui)(gui)(gui)(gui)同時承受上(shang)下左(zuo)右(you)等各方向的(de)負(fu)荷(he)，回流系(xi)統(tong)及精(jing)(jing)簡化(hua)的(de)結(jie)構設計讓線性(xing)導(dao)(dao)(dao)軌(gui)(gui)(gui)(gui)有更平順且低噪音的(de)運(yun)(yun)動(dong)(dong)。

滑塊-使運(yun)動由曲(qu)線轉變為直線。

直(zhi)線(xian)(xian)導(dao)軌主要是(shi)用(yong)在精度要求比(bi)較高的機(ji)械(xie)(xie)(xie)結構(gou)上,直(zhi)線(xian)(xian)導(dao)軌的移動(dong)(dong)(dong)元件(jian)(jian)和固定元件(jian)(jian)之間不用(yong)中間介質(zhi)，而用(yong)滾(gun)動(dong)(dong)(dong)鋼(gang)球(qiu)。因(yin)為滾(gun)動(dong)(dong)(dong)鋼(gang)球(qiu)適應(ying)于高速運動(dong)(dong)(dong)、摩擦(ca)系數小、靈敏度高，滿足運動(dong)(dong)(dong)部(bu)件(jian)(jian)的工作要求，被(bei)廣泛應(ying)用(yong)在自動(dong)(dong)(dong)化(hua)機(ji)械(xie)(xie)(xie)上比(bi)較多,像磨(mo)床(chuang)(chuang)、銑床(chuang)(chuang)、車床(chuang)(chuang)、檢測儀器(qi)設備、木工機(ji)械(xie)(xie)(xie)、搬運機(ji)械(xie)(xie)(xie)、傳送裝置、自動(dong)(dong)(dong)化(hua)機(ji)械(xie)(xie)(xie)、半導(dao)體機(ji)械(xie)(xie)(xie)、包裝機(ji)械(xie)(xie)(xie)、機(ji)械(xie)(xie)(xie)手(shou)臂、自動(dong)(dong)(dong)化(hua)機(ji)床(chuang)(chuang)、激(ji)光行業(ye)、汽(qi)車制造、新能源等行業(ye)。