直(zhi)線導軌(gui)(gui)(gui)又稱線軌(gui)(gui)(gui)、滑(hua)軌(gui)(gui)(gui)、線性導軌(gui)(gui)(gui)、線性滑(hua)軌(gui)(gui)(gui)，用(yong)于高(gao)(gao)(gao)精(jing)或高(gao)(gao)(gao)速(su)直(zhi)線往(wang)復運動(dong)場合，且可以承擔(dan)一定(ding)的扭矩(ju)，可在高(gao)(gao)(gao)負(fu)載(zai)的情況下實(shi)現高(gao)(gao)(gao)精(jing)度的直(zhi)線運動(dong)。

直(zhi)(zhi)線(xian)(xian)(xian)導(dao)(dao)軌(gui)運(yun)(yun)動(dong)(dong)(dong)(dong)(dong)的作用(yong)是用(yong)來(lai)支撐和(he)(he)引(yin)導(dao)(dao)運(yun)(yun)動(dong)(dong)(dong)(dong)(dong)部件，按給定(ding)(ding)的方向做(zuo)往復(fu)直(zhi)(zhi)線(xian)(xian)(xian)運(yun)(yun)動(dong)(dong)(dong)(dong)(dong)。　直(zhi)(zhi)線(xian)(xian)(xian)軸承(cheng)主(zhu)要用(yong)在自動(dong)(dong)(dong)(dong)(dong)化(hua)機(ji)(ji)械上比較多,像(xiang)直(zhi)(zhi)線(xian)(xian)(xian)導(dao)(dao)軌(gui)主(zhu)要是用(yong)在精(jing)度要求比較高(gao)的機(ji)(ji)械結(jie)構(gou)上,直(zhi)(zhi)線(xian)(xian)(xian)導(dao)(dao)軌(gui)的移動(dong)(dong)(dong)(dong)(dong)元件和(he)(he)固定(ding)(ding)元件之間(jian)不用(yong)中間(jian)介質(zhi)，而用(yong)滾動(dong)(dong)(dong)(dong)(dong)鋼(gang)(gang)球。可(ke)以理解為是一(yi)種滾動(dong)(dong)(dong)(dong)(dong)導(dao)(dao)引(yin)，是由鋼(gang)(gang)珠在滑(hua)(hua)塊跟(gen)導(dao)(dao)軌(gui)之間(jian)無(wu)限滾動(dong)(dong)(dong)(dong)(dong)循(xun)環， 從而使負(fu)載(zai)平臺沿著導(dao)(dao)軌(gui)輕易的高(gao)精(jing)度線(xian)(xian)(xian)性運(yun)(yun)動(dong)(dong)(dong)(dong)(dong)，并將(jiang)摩(mo)擦系數(shu)降(jiang)至平常傳(chuan)統滑(hua)(hua)動(dong)(dong)(dong)(dong)(dong)導(dao)(dao)引(yin)的五十分之一(yi)，能(neng)輕易地達到很高(gao)的定(ding)(ding)位(wei)精(jing)度。滑(hua)(hua)塊跟(gen)導(dao)(dao)軌(gui)間(jian)末制單元設計，使線(xian)(xian)(xian)形導(dao)(dao)軌(gui)同時承(cheng)受(shou)上下左(zuo)右等各方向的負(fu)荷，回流系統及精(jing)簡化(hua)的結(jie)構(gou)設計讓線(xian)(xian)(xian)性導(dao)(dao)軌(gui)有更平順且低噪音的運(yun)(yun)動(dong)(dong)(dong)(dong)(dong)。

滑塊-使(shi)運動由曲線轉變為直(zhi)線。

直線(xian)導(dao)軌主要(yao)(yao)是用在精(jing)度(du)要(yao)(yao)求(qiu)比較高(gao)(gao)的(de)機(ji)(ji)(ji)(ji)(ji)械(xie)(xie)(xie)(xie)結構上,直線(xian)導(dao)軌的(de)移(yi)動(dong)(dong)(dong)元件和固(gu)定元件之間不(bu)用中間介質，而(er)用滾(gun)動(dong)(dong)(dong)鋼球(qiu)。因為(wei)滾(gun)動(dong)(dong)(dong)鋼球(qiu)適應(ying)于高(gao)(gao)速運動(dong)(dong)(dong)、摩(mo)擦(ca)系數小、靈敏度(du)高(gao)(gao)，滿(man)足運動(dong)(dong)(dong)部件的(de)工(gong)作要(yao)(yao)求(qiu)，被廣(guang)泛應(ying)用在自(zi)動(dong)(dong)(dong)化機(ji)(ji)(ji)(ji)(ji)械(xie)(xie)(xie)(xie)上比較多,像(xiang)磨(mo)床(chuang)(chuang)(chuang)、銑床(chuang)(chuang)(chuang)、車床(chuang)(chuang)(chuang)、檢測(ce)儀器設(she)備、木(mu)工(gong)機(ji)(ji)(ji)(ji)(ji)械(xie)(xie)(xie)(xie)、搬運機(ji)(ji)(ji)(ji)(ji)械(xie)(xie)(xie)(xie)、傳送裝置、自(zi)動(dong)(dong)(dong)化機(ji)(ji)(ji)(ji)(ji)械(xie)(xie)(xie)(xie)、半導(dao)體機(ji)(ji)(ji)(ji)(ji)械(xie)(xie)(xie)(xie)、包裝機(ji)(ji)(ji)(ji)(ji)械(xie)(xie)(xie)(xie)、機(ji)(ji)(ji)(ji)(ji)械(xie)(xie)(xie)(xie)手臂、自(zi)動(dong)(dong)(dong)化機(ji)(ji)(ji)(ji)(ji)床(chuang)(chuang)(chuang)、激光行業、汽(qi)車制造、新能源等行業。