液(ye)壓(ya)(ya)傳(chuan)動(dong)(dong)(dong)是以(yi)液(ye)體為工(gong)作介質(zhi)，利用液(ye)體的壓(ya)(ya)力(li)(li)能(neng)來(lai)實現運(yun)動(dong)(dong)(dong)和(he)力(li)(li)的一種傳(chuan)動(dong)(dong)(dong)方式。一般而(er)言，能(neng)夠(gou)實現某種特定功(gong)能(neng)的液(ye)壓(ya)(ya)元(yuan)(yuan)件(jian)(jian)的組合，稱(cheng)為液(ye)壓(ya)(ya)回路，而(er)若干特定的基本功(gong)能(neng)回路連接或復合而(er)成(cheng)的總體則(ze)稱(cheng)為直(zhi)流液(ye)壓(ya)(ya)動(dong)(dong)(dong)力(li)(li)單元(yuan)(yuan)。直(zhi)流液(ye)壓(ya)(ya)動(dong)(dong)(dong)力(li)(li)單元(yuan)(yuan)通常(chang)都是由液(ye)壓(ya)(ya)元(yuan)(yuan)件(jian)(jian)（動(dong)(dong)(dong)力(li)(li)元(yuan)(yuan)件(jian)(jian)、執行元(yuan)(yuan)件(jian)(jian)、控制元(yuan)(yuan)件(jian)(jian)、輔助(zhu)元(yuan)(yuan)件(jian)(jian)）和(he)工(gong)作介質(zhi)兩大部分組成(cheng)。

直流(liu)液壓動力(li)單元型號規格：