液(ye)(ye)(ye)壓(ya)(ya)傳動(dong)是(shi)以液(ye)(ye)(ye)體(ti)為工(gong)作介(jie)質，利用液(ye)(ye)(ye)體(ti)的壓(ya)(ya)力能來實(shi)現(xian)運動(dong)和力的一種傳動(dong)方式(shi)。一般而(er)言，能夠實(shi)現(xian)某種特定(ding)(ding)功能的液(ye)(ye)(ye)壓(ya)(ya)元(yuan)(yuan)件(jian)的組合(he)，稱為液(ye)(ye)(ye)壓(ya)(ya)回路，而(er)若干特定(ding)(ding)的基本(ben)功能回路連(lian)接或復(fu)合(he)而(er)成的總(zong)體(ti)則(ze)稱為直流液(ye)(ye)(ye)壓(ya)(ya)動(dong)力單元(yuan)(yuan)。直流液(ye)(ye)(ye)壓(ya)(ya)動(dong)力單元(yuan)(yuan)通常(chang)都(dou)是(shi)由液(ye)(ye)(ye)壓(ya)(ya)元(yuan)(yuan)件(jian)（動(dong)力元(yuan)(yuan)件(jian)、執行元(yuan)(yuan)件(jian)、控制元(yuan)(yuan)件(jian)、輔助元(yuan)(yuan)件(jian)）和工(gong)作介(jie)質兩大部(bu)分組成。

直流液壓動力單元(yuan)型號規格：