直線(xian)導軌(gui)又稱線(xian)軌(gui)、滑(hua)軌(gui)、線(xian)性導軌(gui)、線(xian)性滑(hua)軌(gui)，用于高(gao)(gao)精(jing)或(huo)高(gao)(gao)速直線(xian)往復運(yun)動場(chang)合，且可以承擔一定的(de)扭矩，可在高(gao)(gao)負載的(de)情況下實現(xian)高(gao)(gao)精(jing)度的(de)直線(xian)運(yun)動。

直(zhi)線導(dao)(dao)(dao)軌(gui)(gui)(gui)運(yun)(yun)動(dong)(dong)(dong)的(de)(de)(de)(de)(de)作用(yong)(yong)是(shi)用(yong)(yong)來支撐和引導(dao)(dao)(dao)運(yun)(yun)動(dong)(dong)(dong)部件(jian)，按給定(ding)的(de)(de)(de)(de)(de)方向做往(wang)復(fu)直(zhi)線運(yun)(yun)動(dong)(dong)(dong)。　直(zhi)線軸(zhou)承主(zhu)(zhu)要用(yong)(yong)在自動(dong)(dong)(dong)化(hua)機械上比較多,像(xiang)直(zhi)線導(dao)(dao)(dao)軌(gui)(gui)(gui)主(zhu)(zhu)要是(shi)用(yong)(yong)在精(jing)(jing)度要求比較高的(de)(de)(de)(de)(de)機械結構(gou)(gou)上,直(zhi)線導(dao)(dao)(dao)軌(gui)(gui)(gui)的(de)(de)(de)(de)(de)移動(dong)(dong)(dong)元件(jian)和固(gu)定(ding)元件(jian)之間(jian)不用(yong)(yong)中間(jian)介質，而用(yong)(yong)滾動(dong)(dong)(dong)鋼球。可以理解為是(shi)一種(zhong)滾動(dong)(dong)(dong)導(dao)(dao)(dao)引，是(shi)由(you)鋼珠在滑塊跟導(dao)(dao)(dao)軌(gui)(gui)(gui)之間(jian)無限(xian)滾動(dong)(dong)(dong)循環(huan)， 從而使(shi)負(fu)載(zai)平(ping)臺(tai)沿(yan)著(zhu)導(dao)(dao)(dao)軌(gui)(gui)(gui)輕易(yi)的(de)(de)(de)(de)(de)高精(jing)(jing)度線性運(yun)(yun)動(dong)(dong)(dong)，并將摩擦系數降至平(ping)常傳統滑動(dong)(dong)(dong)導(dao)(dao)(dao)引的(de)(de)(de)(de)(de)五十分之一，能輕易(yi)地達到很高的(de)(de)(de)(de)(de)定(ding)位精(jing)(jing)度。滑塊跟導(dao)(dao)(dao)軌(gui)(gui)(gui)間(jian)末制(zhi)單元設(she)計，使(shi)線形導(dao)(dao)(dao)軌(gui)(gui)(gui)同時承受(shou)上下左右等各方向的(de)(de)(de)(de)(de)負(fu)荷，回(hui)流系統及(ji)精(jing)(jing)簡化(hua)的(de)(de)(de)(de)(de)結構(gou)(gou)設(she)計讓(rang)線性導(dao)(dao)(dao)軌(gui)(gui)(gui)有更平(ping)順且低(di)噪音(yin)的(de)(de)(de)(de)(de)運(yun)(yun)動(dong)(dong)(dong)。

滑塊-使運動由曲線轉變為直線。

直線導(dao)軌主要(yao)(yao)是用在精度要(yao)(yao)求比較高的機(ji)械(xie)(xie)(xie)結(jie)構上,直線導(dao)軌的移(yi)動(dong)元(yuan)件(jian)(jian)(jian)和固(gu)定(ding)元(yuan)件(jian)(jian)(jian)之間(jian)(jian)不用中間(jian)(jian)介質，而用滾(gun)動(dong)鋼球(qiu)。因為滾(gun)動(dong)鋼球(qiu)適(shi)應(ying)于(yu)高速運動(dong)、摩擦系數小(xiao)、靈(ling)敏度高，滿足運動(dong)部(bu)件(jian)(jian)(jian)的工(gong)作要(yao)(yao)求，被(bei)廣泛應(ying)用在自(zi)動(dong)化(hua)(hua)機(ji)械(xie)(xie)(xie)上比較多,像磨床(chuang)、銑床(chuang)、車床(chuang)、檢測儀器設備、木工(gong)機(ji)械(xie)(xie)(xie)、搬運機(ji)械(xie)(xie)(xie)、傳送裝置、自(zi)動(dong)化(hua)(hua)機(ji)械(xie)(xie)(xie)、半導(dao)體機(ji)械(xie)(xie)(xie)、包(bao)裝機(ji)械(xie)(xie)(xie)、機(ji)械(xie)(xie)(xie)手臂、自(zi)動(dong)化(hua)(hua)機(ji)床(chuang)、激光行(xing)業(ye)、汽車制造、新能源等行(xing)業(ye)。