直(zhi)線(xian)導軌(gui)(gui)又稱線(xian)軌(gui)(gui)、滑軌(gui)(gui)、線(xian)性導軌(gui)(gui)、線(xian)性滑軌(gui)(gui)，用于高(gao)精或高(gao)速(su)直(zhi)線(xian)往(wang)復運動場(chang)合，且可以承擔一(yi)定的(de)扭矩，可在高(gao)負載(zai)的(de)情況下(xia)實(shi)現高(gao)精度(du)的(de)直(zhi)線(xian)運動。

直(zhi)線導(dao)軌(gui)(gui)運(yun)(yun)動(dong)(dong)(dong)(dong)的(de)作用是(shi)用來(lai)支撐(cheng)和(he)引導(dao)運(yun)(yun)動(dong)(dong)(dong)(dong)部件，按(an)給定的(de)方向做往復直(zhi)線運(yun)(yun)動(dong)(dong)(dong)(dong)。　直(zhi)線軸承(cheng)主(zhu)要用在自動(dong)(dong)(dong)(dong)化(hua)機(ji)械上(shang)(shang)比(bi)較(jiao)多,像(xiang)直(zhi)線導(dao)軌(gui)(gui)主(zhu)要是(shi)用在精度(du)(du)要求(qiu)比(bi)較(jiao)高的(de)機(ji)械結構上(shang)(shang),直(zhi)線導(dao)軌(gui)(gui)的(de)移動(dong)(dong)(dong)(dong)元(yuan)件和(he)固(gu)定元(yuan)件之(zhi)(zhi)間不用中間介質，而用滾(gun)動(dong)(dong)(dong)(dong)鋼球。可以理解為是(shi)一種滾(gun)動(dong)(dong)(dong)(dong)導(dao)引，是(shi)由鋼珠在滑塊跟導(dao)軌(gui)(gui)之(zhi)(zhi)間無限滾(gun)動(dong)(dong)(dong)(dong)循環， 從而使負載平臺沿著導(dao)軌(gui)(gui)輕易的(de)高精度(du)(du)線性(xing)運(yun)(yun)動(dong)(dong)(dong)(dong)，并將摩擦系(xi)數降(jiang)至(zhi)平常傳統滑動(dong)(dong)(dong)(dong)導(dao)引的(de)五(wu)十分之(zhi)(zhi)一，能輕易地達(da)到很(hen)高的(de)定位精度(du)(du)。滑塊跟導(dao)軌(gui)(gui)間末制單元(yuan)設計，使線形導(dao)軌(gui)(gui)同(tong)時承(cheng)受上(shang)(shang)下左右等各方向的(de)負荷(he)，回流系(xi)統及精簡(jian)化(hua)的(de)結構設計讓線性(xing)導(dao)軌(gui)(gui)有(you)更平順且(qie)低噪音(yin)的(de)運(yun)(yun)動(dong)(dong)(dong)(dong)。

滑塊(kuai)-使(shi)運動由曲線轉變(bian)為直(zhi)線。

直線導軌(gui)(gui)主要(yao)是用在精度要(yao)求(qiu)比較高(gao)的(de)機械(xie)結(jie)構(gou)上(shang),直線導軌(gui)(gui)的(de)移(yi)動(dong)(dong)元(yuan)件和固定(ding)元(yuan)件之間不用中間介質，而用滾(gun)動(dong)(dong)鋼球(qiu)(qiu)。因為滾(gun)動(dong)(dong)鋼球(qiu)(qiu)適(shi)應于(yu)高(gao)速運(yun)動(dong)(dong)、摩擦系數小(xiao)、靈敏(min)度高(gao)，滿足運(yun)動(dong)(dong)部件的(de)工作要(yao)求(qiu)，被(bei)廣泛應用在自(zi)動(dong)(dong)化機械(xie)上(shang)比較多(duo),像磨(mo)床、銑(xian)床、車床、檢測儀器設(she)備、木工機械(xie)、搬運(yun)機械(xie)、傳送裝置、自(zi)動(dong)(dong)化機械(xie)、半導體機械(xie)、包裝機械(xie)、機械(xie)手(shou)臂、自(zi)動(dong)(dong)化機床、激光(guang)行業(ye)、汽車制造(zao)、新能源等行業(ye)。