直線(xian)(xian)導軌(gui)又稱線(xian)(xian)軌(gui)、滑(hua)軌(gui)、線(xian)(xian)性導軌(gui)、線(xian)(xian)性滑(hua)軌(gui)，用于高(gao)(gao)精或高(gao)(gao)速直線(xian)(xian)往復運(yun)動場(chang)合，且可以承擔一定的扭矩，可在高(gao)(gao)負(fu)載的情況下實現(xian)高(gao)(gao)精度的直線(xian)(xian)運(yun)動。

直線(xian)(xian)(xian)導(dao)(dao)(dao)(dao)軌(gui)(gui)(gui)(gui)運(yun)(yun)(yun)動(dong)的(de)(de)作用(yong)(yong)是(shi)用(yong)(yong)來支撐和引導(dao)(dao)(dao)(dao)運(yun)(yun)(yun)動(dong)部件，按給定(ding)的(de)(de)方向做(zuo)往復直線(xian)(xian)(xian)運(yun)(yun)(yun)動(dong)。　直線(xian)(xian)(xian)軸承主(zhu)(zhu)要(yao)用(yong)(yong)在自(zi)動(dong)化(hua)機(ji)械上(shang)比(bi)較(jiao)多,像直線(xian)(xian)(xian)導(dao)(dao)(dao)(dao)軌(gui)(gui)(gui)(gui)主(zhu)(zhu)要(yao)是(shi)用(yong)(yong)在精度要(yao)求(qiu)比(bi)較(jiao)高的(de)(de)機(ji)械結(jie)構(gou)(gou)上(shang),直線(xian)(xian)(xian)導(dao)(dao)(dao)(dao)軌(gui)(gui)(gui)(gui)的(de)(de)移動(dong)元(yuan)件和固定(ding)元(yuan)件之(zhi)間不用(yong)(yong)中(zhong)間介(jie)質(zhi)，而用(yong)(yong)滾動(dong)鋼球。可以理解為(wei)是(shi)一(yi)種滾動(dong)導(dao)(dao)(dao)(dao)引，是(shi)由鋼珠在滑(hua)塊(kuai)跟(gen)導(dao)(dao)(dao)(dao)軌(gui)(gui)(gui)(gui)之(zhi)間無限滾動(dong)循環， 從而使負載平(ping)臺沿著導(dao)(dao)(dao)(dao)軌(gui)(gui)(gui)(gui)輕易(yi)的(de)(de)高精度線(xian)(xian)(xian)性運(yun)(yun)(yun)動(dong)，并將摩擦(ca)系(xi)數降(jiang)至平(ping)常(chang)傳統滑(hua)動(dong)導(dao)(dao)(dao)(dao)引的(de)(de)五十分之(zhi)一(yi)，能輕易(yi)地達到很(hen)高的(de)(de)定(ding)位精度。滑(hua)塊(kuai)跟(gen)導(dao)(dao)(dao)(dao)軌(gui)(gui)(gui)(gui)間末制(zhi)單(dan)元(yuan)設計，使線(xian)(xian)(xian)形(xing)導(dao)(dao)(dao)(dao)軌(gui)(gui)(gui)(gui)同時承受上(shang)下左右等各(ge)方向的(de)(de)負荷(he)，回(hui)流系(xi)統及精簡(jian)化(hua)的(de)(de)結(jie)構(gou)(gou)設計讓線(xian)(xian)(xian)性導(dao)(dao)(dao)(dao)軌(gui)(gui)(gui)(gui)有更(geng)平(ping)順且低噪音的(de)(de)運(yun)(yun)(yun)動(dong)。

滑塊-使運(yun)動(dong)由曲線(xian)轉變為直線(xian)。

直(zhi)線導軌(gui)主要(yao)是用(yong)在精度要(yao)求比較高的機(ji)械(xie)(xie)結構上,直(zhi)線導軌(gui)的移(yi)動元件和固定(ding)元件之間不用(yong)中間介質(zhi)，而用(yong)滾動鋼球(qiu)(qiu)。因為滾動鋼球(qiu)(qiu)適應(ying)于高速運(yun)動、摩擦(ca)系數小(xiao)、靈敏度高，滿足(zu)運(yun)動部件的工作要(yao)求，被(bei)廣泛(fan)應(ying)用(yong)在自動化(hua)(hua)機(ji)械(xie)(xie)上比較多(duo),像磨床、銑床、車床、檢測(ce)儀器設備、木工機(ji)械(xie)(xie)、搬運(yun)機(ji)械(xie)(xie)、傳(chuan)送裝(zhuang)置、自動化(hua)(hua)機(ji)械(xie)(xie)、半導體機(ji)械(xie)(xie)、包裝(zhuang)機(ji)械(xie)(xie)、機(ji)械(xie)(xie)手臂、自動化(hua)(hua)機(ji)床、激光行業、汽車制造、新能源等行業。