位(wei)于(yu)汽(qi)車(che)(che)懸架與(yu)汽(qi)車(che)(che)車(che)(che)輪之間(jian)，兩(liang)端(duan)安裝車(che)(che)輪。通過懸架與(yu)車(che)(che)架(或(huo)(huo)車(che)(che)身(shen))相連，其功用(yong)(yong)(yong)(yong)(yong)(yong)是(shi)傳遞車(che)(che)架(或(huo)(huo)車(che)(che)身(shen))與(yu)車(che)(che)輪之間(jian)各種載(zai)荷的(de)作用(yong)(yong)(yong)(yong)(yong)(yong)。按(an)懸架結構(gou)不同(tong)，分為(wei)(wei)整(zheng)體式(shi)(shi)和(he)(he)斷(duan)開(kai)式(shi)(shi)兩(liang)種；整(zheng)體式(shi)(shi)汽(qi)車(che)(che)車(che)(che)橋(qiao)(qiao)的(de)中部是(shi)剛性實心(xin)或(huo)(huo)空(kong)心(xin)梁，與(yu)非(fei)獨立懸架配用(yong)(yong)(yong)(yong)(yong)(yong)；斷(duan)開(kai)式(shi)(shi)車(che)(che)橋(qiao)(qiao)為(wei)(wei)活動(dong)關節式(shi)(shi)結構(gou)，與(yu)獨立懸架配用(yong)(yong)(yong)(yong)(yong)(yong)。按(an)車(che)(che)橋(qiao)(qiao)上(shang)車(che)(che)輪的(de)作用(yong)(yong)(yong)(yong)(yong)(yong)不同(tong)，汽(qi)車(che)(che)車(che)(che)橋(qiao)(qiao)分為(wei)(wei)轉(zhuan)(zhuan)向(xiang)橋(qiao)(qiao)，驅(qu)(qu)動(dong)橋(qiao)(qiao)。轉(zhuan)(zhuan)向(xiang)驅(qu)(qu)動(dong)橋(qiao)(qiao)和(he)(he)支持橋(qiao)(qiao)四種類型。其中轉(zhuan)(zhuan)向(xiang)橋(qiao)(qiao)和(he)(he)支持橋(qiao)(qiao)都屬于(yu)從動(dong)橋(qiao)(qiao)。在后(hou)輪驅(qu)(qu)動(dong)的(de)汽(qi)車(che)(che)中，前橋(qiao)(qiao)不僅用(yong)(yong)(yong)(yong)(yong)(yong)于(yu)承(cheng)載(zai)，而(er)且(qie)兼起(qi)轉(zhuan)(zhuan)向(xiang)作用(yong)(yong)(yong)(yong)(yong)(yong)，稱(cheng)為(wei)(wei)轉(zhuan)(zhuan)向(xiang)橋(qiao)(qiao)；后(hou)橋(qiao)(qiao)不僅用(yong)(yong)(yong)(yong)(yong)(yong)于(yu)承(cheng)載(zai)，而(er)且(qie)兼起(qi)驅(qu)(qu)動(dong)的(de)作用(yong)(yong)(yong)(yong)(yong)(yong)，稱(cheng)為(wei)(wei)驅(qu)(qu)動(dong)橋(qiao)(qiao)。越(yue)野汽(qi)車(che)(che)和(he)(he)前輪驅(qu)(qu)動(dong)汽(qi)車(che)(che)的(de)前橋(qiao)(qiao)，除了承(cheng)載(zai)和(he)(he)轉(zhuan)(zhuan)向(xiang)的(de)作用(yong)(yong)(yong)(yong)(yong)(yong)外，還兼起(qi)驅(qu)(qu)動(dong)作用(yong)(yong)(yong)(yong)(yong)(yong)，所以稱(cheng)為(wei)(wei)轉(zhuan)(zhuan)向(xiang)驅(qu)(qu)動(dong)橋(qiao)(qiao)。只起(qi)支承(cheng)作用(yong)(yong)(yong)(yong)(yong)(yong)的(de)車(che)(che)橋(qiao)(qiao)稱(cheng)為(wei)(wei)支持橋(qiao)(qiao)，掛(gua)車(che)(che)的(de)車(che)(che)橋(qiao)(qiao)就(jiu)是(shi)支持橋(qiao)(qiao)，支持橋(qiao)(qiao)除不能(neng)轉(zhuan)(zhuan)向(xiang)外，其他功能(neng)和(he)(he)結構(gou)與(yu)轉(zhuan)(zhuan)向(xiang)橋(qiao)(qiao)相同(tong)。