直線(xian)導軌(gui)又(you)稱線(xian)軌(gui)、滑軌(gui)、線(xian)性導軌(gui)、線(xian)性滑軌(gui)，用于高精或高速直線(xian)往復運動場合，且可以(yi)承(cheng)擔一定的扭矩(ju)，可在(zai)高負載(zai)的情(qing)況下實現高精度的直線(xian)運動。

直線(xian)(xian)導(dao)(dao)(dao)(dao)(dao)軌(gui)(gui)(gui)(gui)運動(dong)(dong)(dong)(dong)的(de)(de)作(zuo)用是(shi)用來(lai)支撐和引(yin)導(dao)(dao)(dao)(dao)(dao)運動(dong)(dong)(dong)(dong)部件，按給定的(de)(de)方(fang)向(xiang)做(zuo)往復直線(xian)(xian)運動(dong)(dong)(dong)(dong)。　直線(xian)(xian)軸承(cheng)主(zhu)要用在(zai)自動(dong)(dong)(dong)(dong)化機械(xie)上比(bi)較多,像直線(xian)(xian)導(dao)(dao)(dao)(dao)(dao)軌(gui)(gui)(gui)(gui)主(zhu)要是(shi)用在(zai)精(jing)度(du)要求比(bi)較高(gao)(gao)的(de)(de)機械(xie)結(jie)構上,直線(xian)(xian)導(dao)(dao)(dao)(dao)(dao)軌(gui)(gui)(gui)(gui)的(de)(de)移(yi)動(dong)(dong)(dong)(dong)元(yuan)件和固定元(yuan)件之(zhi)間不用中(zhong)間介質，而(er)用滾(gun)動(dong)(dong)(dong)(dong)鋼球。可以理解為是(shi)一種滾(gun)動(dong)(dong)(dong)(dong)導(dao)(dao)(dao)(dao)(dao)引(yin)，是(shi)由鋼珠在(zai)滑塊跟導(dao)(dao)(dao)(dao)(dao)軌(gui)(gui)(gui)(gui)之(zhi)間無限滾(gun)動(dong)(dong)(dong)(dong)循環(huan)， 從而(er)使(shi)負載平(ping)臺沿著導(dao)(dao)(dao)(dao)(dao)軌(gui)(gui)(gui)(gui)輕易的(de)(de)高(gao)(gao)精(jing)度(du)線(xian)(xian)性運動(dong)(dong)(dong)(dong)，并將摩擦系(xi)數降至平(ping)常(chang)傳統(tong)滑動(dong)(dong)(dong)(dong)導(dao)(dao)(dao)(dao)(dao)引(yin)的(de)(de)五十分之(zhi)一，能輕易地達到(dao)很高(gao)(gao)的(de)(de)定位精(jing)度(du)。滑塊跟導(dao)(dao)(dao)(dao)(dao)軌(gui)(gui)(gui)(gui)間末(mo)制單元(yuan)設計(ji)(ji)，使(shi)線(xian)(xian)形導(dao)(dao)(dao)(dao)(dao)軌(gui)(gui)(gui)(gui)同時(shi)承(cheng)受上下左(zuo)右等(deng)各方(fang)向(xiang)的(de)(de)負荷，回(hui)流(liu)系(xi)統(tong)及精(jing)簡化的(de)(de)結(jie)構設計(ji)(ji)讓線(xian)(xian)性導(dao)(dao)(dao)(dao)(dao)軌(gui)(gui)(gui)(gui)有(you)更平(ping)順且低噪音的(de)(de)運動(dong)(dong)(dong)(dong)。

滑(hua)塊-使(shi)運動由曲(qu)線轉(zhuan)變為直線。

直線導軌主(zhu)要是用(yong)在精度要求比較高的機(ji)(ji)械(xie)(xie)結構(gou)上(shang),直線導軌的移動(dong)元件和(he)固定(ding)元件之間不用(yong)中間介質，而用(yong)滾(gun)動(dong)鋼球。因為滾(gun)動(dong)鋼球適應(ying)(ying)于(yu)高速運動(dong)、摩擦系數(shu)小、靈敏(min)度高，滿足運動(dong)部件的工作要求，被廣泛應(ying)(ying)用(yong)在自動(dong)化(hua)機(ji)(ji)械(xie)(xie)上(shang)比較多,像磨床(chuang)(chuang)(chuang)、銑床(chuang)(chuang)(chuang)、車床(chuang)(chuang)(chuang)、檢測儀器設備(bei)、木工機(ji)(ji)械(xie)(xie)、搬運機(ji)(ji)械(xie)(xie)、傳送裝(zhuang)置、自動(dong)化(hua)機(ji)(ji)械(xie)(xie)、半(ban)導體機(ji)(ji)械(xie)(xie)、包裝(zhuang)機(ji)(ji)械(xie)(xie)、機(ji)(ji)械(xie)(xie)手臂、自動(dong)化(hua)機(ji)(ji)床(chuang)(chuang)(chuang)、激光(guang)行業(ye)、汽車制造、新能源等行業(ye)。