直(zhi)線(xian)(xian)導軌(gui)(gui)又稱(cheng)線(xian)(xian)軌(gui)(gui)、滑(hua)軌(gui)(gui)、線(xian)(xian)性(xing)導軌(gui)(gui)、線(xian)(xian)性(xing)滑(hua)軌(gui)(gui)，用于高精(jing)或高速直(zhi)線(xian)(xian)往復(fu)運(yun)動場合，且可(ke)以(yi)承擔一定的(de)扭矩，可(ke)在高負載的(de)情況下實現高精(jing)度的(de)直(zhi)線(xian)(xian)運(yun)動。

直(zhi)(zhi)線(xian)(xian)(xian)(xian)導(dao)(dao)軌(gui)(gui)(gui)運動(dong)(dong)的(de)(de)作(zuo)用是(shi)用來支撐和引(yin)(yin)(yin)導(dao)(dao)運動(dong)(dong)部件，按給定的(de)(de)方向(xiang)做往復直(zhi)(zhi)線(xian)(xian)(xian)(xian)運動(dong)(dong)。　直(zhi)(zhi)線(xian)(xian)(xian)(xian)軸承主要(yao)用在自(zi)動(dong)(dong)化機械上(shang)比(bi)較多(duo),像(xiang)直(zhi)(zhi)線(xian)(xian)(xian)(xian)導(dao)(dao)軌(gui)(gui)(gui)主要(yao)是(shi)用在精(jing)度要(yao)求比(bi)較高(gao)(gao)的(de)(de)機械結(jie)構上(shang),直(zhi)(zhi)線(xian)(xian)(xian)(xian)導(dao)(dao)軌(gui)(gui)(gui)的(de)(de)移動(dong)(dong)元件和固(gu)定元件之(zhi)間(jian)不用中(zhong)間(jian)介質，而用滾動(dong)(dong)鋼球。可以(yi)理解為是(shi)一種(zhong)滾動(dong)(dong)導(dao)(dao)引(yin)(yin)(yin)，是(shi)由鋼珠在滑(hua)塊跟(gen)導(dao)(dao)軌(gui)(gui)(gui)之(zhi)間(jian)無(wu)限滾動(dong)(dong)循(xun)環， 從(cong)而使(shi)負(fu)載(zai)平臺沿著導(dao)(dao)軌(gui)(gui)(gui)輕(qing)易的(de)(de)高(gao)(gao)精(jing)度線(xian)(xian)(xian)(xian)性運動(dong)(dong)，并將摩擦系(xi)(xi)數(shu)降(jiang)至平常傳統滑(hua)動(dong)(dong)導(dao)(dao)引(yin)(yin)(yin)的(de)(de)五十(shi)分(fen)之(zhi)一，能輕(qing)易地達到很高(gao)(gao)的(de)(de)定位精(jing)度。滑(hua)塊跟(gen)導(dao)(dao)軌(gui)(gui)(gui)間(jian)末制單元設(she)(she)計，使(shi)線(xian)(xian)(xian)(xian)形(xing)導(dao)(dao)軌(gui)(gui)(gui)同(tong)時承受上(shang)下左(zuo)右等各方向(xiang)的(de)(de)負(fu)荷，回流系(xi)(xi)統及精(jing)簡化的(de)(de)結(jie)構設(she)(she)計讓(rang)線(xian)(xian)(xian)(xian)性導(dao)(dao)軌(gui)(gui)(gui)有(you)更(geng)平順(shun)且低(di)噪音(yin)的(de)(de)運動(dong)(dong)。

滑塊(kuai)-使(shi)運動由曲(qu)線轉變(bian)為直線。

直(zhi)線導軌主要是(shi)用(yong)在精度要求比較高(gao)的機(ji)(ji)械(xie)(xie)(xie)(xie)結構上,直(zhi)線導軌的移動(dong)(dong)(dong)元(yuan)件(jian)和固定(ding)元(yuan)件(jian)之間不用(yong)中間介質，而用(yong)滾(gun)動(dong)(dong)(dong)鋼球(qiu)。因為(wei)滾(gun)動(dong)(dong)(dong)鋼球(qiu)適應于高(gao)速運動(dong)(dong)(dong)、摩擦系數小、靈敏度高(gao)，滿(man)足運動(dong)(dong)(dong)部件(jian)的工作要求，被廣(guang)泛應用(yong)在自動(dong)(dong)(dong)化機(ji)(ji)械(xie)(xie)(xie)(xie)上比較多,像磨床(chuang)(chuang)、銑床(chuang)(chuang)、車床(chuang)(chuang)、檢測(ce)儀器設(she)備、木工機(ji)(ji)械(xie)(xie)(xie)(xie)、搬(ban)運機(ji)(ji)械(xie)(xie)(xie)(xie)、傳送(song)裝(zhuang)置、自動(dong)(dong)(dong)化機(ji)(ji)械(xie)(xie)(xie)(xie)、半導體(ti)機(ji)(ji)械(xie)(xie)(xie)(xie)、包裝(zhuang)機(ji)(ji)械(xie)(xie)(xie)(xie)、機(ji)(ji)械(xie)(xie)(xie)(xie)手臂、自動(dong)(dong)(dong)化機(ji)(ji)床(chuang)(chuang)、激光行業、汽車制造(zao)、新(xin)能源等行業。