驅(qu)(qu)動(dong)(dong)橋(qiao)是位于傳(chuan)動(dong)(dong)系末(mo)端能改變來自變速器的轉(zhuan)速和(he)(he)(he)轉(zhuan)矩，并將它們傳(chuan)遞(di)給(gei)驅(qu)(qu)動(dong)(dong)輪(lun)的機構。驅(qu)(qu)動(dong)(dong)橋(qiao)一般由主減速器、差速器、車輪(lun)傳(chuan)動(dong)(dong)裝(zhuang)置和(he)(he)(he)驅(qu)(qu)動(dong)(dong)橋(qiao)殼等(deng)組(zu)成，轉(zhuan)向(xiang)驅(qu)(qu)動(dong)(dong)橋(qiao)還(huan)有等(deng)速萬向(xiang)節(jie)。另(ling)外，驅(qu)(qu)動(dong)(dong)橋(qiao)還(huan)要承受作用(yong)于路(lu)面和(he)(he)(he)車架或車身(shen)之(zhi)間的垂(chui)直力，縱向(xiang)力和(he)(he)(he)橫向(xiang)力，以及制動(dong)(dong)力矩和(he)(he)(he)反作用(yong)力。

　　驅動橋(qiao)處于動力傳(chuan)(chuan)(chuan)動系的末端，其基本(ben)功能(neng)是：①將萬向傳(chuan)(chuan)(chuan)動裝(zhuang)置傳(chuan)(chuan)(chuan)來的發動機轉(zhuan)矩通(tong)過(guo)(guo)主減速器(qi)(qi)、差(cha)速器(qi)(qi)、半軸等傳(chuan)(chuan)(chuan)到驅動車(che)輪，實(shi)現(xian)降(jiang)速增大轉(zhuan)矩；②通(tong)過(guo)(guo)主減速器(qi)(qi)圓(yuan)錐齒輪副(fu)改變轉(zhuan)矩的傳(chuan)(chuan)(chuan)遞方向；③通(tong)過(guo)(guo)差(cha)速器(qi)(qi)實(shi)現(xian)兩側車(che)輪差(cha)速作用，保證(zheng)內、外側車(che)輪以不同(tong)轉(zhuan)速轉(zhuan)向；④通(tong)過(guo)(guo)橋(qiao)殼(ke)體和車(che)輪實(shi)現(xian)承(cheng)載及傳(chuan)(chuan)(chuan)力矩作用.