直線(xian)(xian)(xian)導(dao)軌(gui)(gui)(gui)又稱線(xian)(xian)(xian)軌(gui)(gui)(gui)、滑軌(gui)(gui)(gui)、線(xian)(xian)(xian)性(xing)導(dao)軌(gui)(gui)(gui)、線(xian)(xian)(xian)性(xing)滑軌(gui)(gui)(gui)，用于高精或高速直線(xian)(xian)(xian)往(wang)復運動場合(he)，且可以(yi)承擔(dan)一定的扭(niu)矩，可在高負載(zai)的情況下實(shi)現高精度的直線(xian)(xian)(xian)運動。

直線(xian)導(dao)(dao)(dao)軌(gui)(gui)(gui)運動(dong)(dong)(dong)(dong)的(de)作(zuo)用(yong)是用(yong)來(lai)支撐和引(yin)導(dao)(dao)(dao)運動(dong)(dong)(dong)(dong)部(bu)件(jian)，按給定(ding)的(de)方向做往(wang)復直線(xian)運動(dong)(dong)(dong)(dong)。　直線(xian)軸承主(zhu)要用(yong)在自動(dong)(dong)(dong)(dong)化(hua)機(ji)械上(shang)比(bi)較多(duo),像直線(xian)導(dao)(dao)(dao)軌(gui)(gui)(gui)主(zhu)要是用(yong)在精(jing)度要求比(bi)較高的(de)機(ji)械結(jie)構上(shang),直線(xian)導(dao)(dao)(dao)軌(gui)(gui)(gui)的(de)移動(dong)(dong)(dong)(dong)元(yuan)件(jian)和固定(ding)元(yuan)件(jian)之間不用(yong)中(zhong)間介質，而用(yong)滾動(dong)(dong)(dong)(dong)鋼(gang)球。可以理(li)解為是一種滾動(dong)(dong)(dong)(dong)導(dao)(dao)(dao)引(yin)，是由(you)鋼(gang)珠在滑(hua)塊(kuai)(kuai)跟導(dao)(dao)(dao)軌(gui)(gui)(gui)之間無(wu)限滾動(dong)(dong)(dong)(dong)循(xun)環， 從而使(shi)負載平(ping)臺沿著導(dao)(dao)(dao)軌(gui)(gui)(gui)輕(qing)易的(de)高精(jing)度線(xian)性(xing)運動(dong)(dong)(dong)(dong)，并將(jiang)摩擦系(xi)數降至平(ping)常傳統滑(hua)動(dong)(dong)(dong)(dong)導(dao)(dao)(dao)引(yin)的(de)五十分之一，能輕(qing)易地(di)達到(dao)很高的(de)定(ding)位精(jing)度。滑(hua)塊(kuai)(kuai)跟導(dao)(dao)(dao)軌(gui)(gui)(gui)間末制單元(yuan)設(she)計，使(shi)線(xian)形導(dao)(dao)(dao)軌(gui)(gui)(gui)同時承受上(shang)下左右等(deng)各方向的(de)負荷，回(hui)流系(xi)統及精(jing)簡化(hua)的(de)結(jie)構設(she)計讓線(xian)性(xing)導(dao)(dao)(dao)軌(gui)(gui)(gui)有(you)更平(ping)順且低(di)噪音的(de)運動(dong)(dong)(dong)(dong)。

滑塊(kuai)-使運動由曲(qu)線轉變為直線。

直線導(dao)軌(gui)主要是用在精(jing)度要求(qiu)比較高的機(ji)(ji)械(xie)(xie)結構上,直線導(dao)軌(gui)的移動(dong)元(yuan)件和固定元(yuan)件之間(jian)不(bu)用中間(jian)介質，而(er)用滾(gun)動(dong)鋼(gang)球(qiu)。因(yin)為滾(gun)動(dong)鋼(gang)球(qiu)適應于高速運動(dong)、摩擦系數(shu)小(xiao)、靈敏度高，滿足運動(dong)部件的工作要求(qiu)，被廣泛應用在自動(dong)化機(ji)(ji)械(xie)(xie)上比較多,像(xiang)磨床、銑(xian)床、車床、檢測(ce)儀器設備、木(mu)工機(ji)(ji)械(xie)(xie)、搬(ban)運機(ji)(ji)械(xie)(xie)、傳送裝置、自動(dong)化機(ji)(ji)械(xie)(xie)、半導(dao)體(ti)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)化機(ji)(ji)床、激光行業、汽車制造、新能(neng)源等行業。