自動(dong)(dong)(dong)(dong)扶(fu)(fu)梯(ti)(ti)由梯(ti)(ti)路(lu)（變(bian)型的(de)板(ban)式輸(shu)送(song)機）和(he)兩旁的(de)扶(fu)(fu)手（變(bian)形的(de)帶式輸(shu)送(song)機）組成。其主(zhu)要(yao)部件有梯(ti)(ti)級(ji)、牽引鏈(lian)條及(ji)鏈(lian)輪(lun)、導軌(gui)系(xi)統(tong)、主(zhu)傳動(dong)(dong)(dong)(dong)系(xi)統(tong)（包括電動(dong)(dong)(dong)(dong)機、減速(su)裝置、制動(dong)(dong)(dong)(dong)器及(ji)中間傳動(dong)(dong)(dong)(dong)環節等）驅動(dong)(dong)(dong)(dong)主(zhu)軸(zhou)、梯(ti)(ti)路(lu)張(zhang)緊裝置、扶(fu)(fu)手系(xi)統(tong)、梳板(ban)、扶(fu)(fu)梯(ti)(ti)骨架和(he)電氣系(xi)統(tong)等。梯(ti)(ti)級(ji)在乘(cheng)客入(ru)口處作水(shui)平(ping)運(yun)動(dong)(dong)(dong)(dong)（方(fang)便乘(cheng)客登(deng)梯(ti)(ti)）以后(hou)逐漸(jian)形成階梯(ti)(ti)；接近入(ru)口處階梯(ti)(ti)逐漸(jian)消失，梯(ti)(ti)級(ji)再度(du)作水(shui)平(ping)運(yun)動(dong)(dong)(dong)(dong)。這些運(yun)動(dong)(dong)(dong)(dong)都是(shi)由梯(ti)(ti)級(ji)主(zhu)輪(lun)、輔輪(lun)分別(bie)沿不同的(de)梯(ti)(ti)級(ji)導軌(gui)行走來實(shi)現的(de)。

自動(dong)扶梯的速(su)度范(fan)圍(wei)是(shi)從27米/分(fen)至55米/分(fen)。一(yi)個移動(dong)速(su)度為44米/分(fen)的自動(dong)扶梯在(zai)一(yi)小時內可承載(zai)1萬多(duo)(duo)人，比標準電梯的承載(zai)人數多(duo)(duo)得多(duo)(duo)。