轉(zhuan)(zhuan)(zhuan)(zhuan)(zhuan)向(xiang)(xiang)機總成即轉(zhuan)(zhuan)(zhuan)(zhuan)(zhuan)向(xiang)(xiang)器(qi)(qi)(qi),又名轉(zhuan)(zhuan)(zhuan)(zhuan)(zhuan)向(xiang)(xiang)機、方向(xiang)(xiang)機,它(ta)(ta)是(shi)轉(zhuan)(zhuan)(zhuan)(zhuan)(zhuan)向(xiang)(xiang)系中最(zui)重(zhong)要的(de)部(bu)件。它(ta)(ta)的(de)作(zuo)用是(shi):增大轉(zhuan)(zhuan)(zhuan)(zhuan)(zhuan)向(xiang)(xiang)盤(pan)傳到(dao)轉(zhuan)(zhuan)(zhuan)(zhuan)(zhuan)向(xiang)(xiang)傳動(dong)(dong)(dong)機構的(de)力(li)(li)(li)和(he)(he)改變力(li)(li)(li)的(de)傳遞(di)方向(xiang)(xiang)。轉(zhuan)(zhuan)(zhuan)(zhuan)(zhuan)向(xiang)(xiang)器(qi)(qi)(qi)的(de)操縱(zong)是(shi)全液壓(ya)式(shi),也就(jiu)是(shi)說在轉(zhuan)(zhuan)(zhuan)(zhuan)(zhuan)向(xiang)(xiang)柱和(he)(he)轉(zhuan)(zhuan)(zhuan)(zhuan)(zhuan)向(xiang)(xiang)輪之(zhi)間沒有(you)機械(xie)連接(jie),在轉(zhuan)(zhuan)(zhuan)(zhuan)(zhuan)向(xiang)(xiang)器(qi)(qi)(qi)與轉(zhuan)(zhuan)(zhuan)(zhuan)(zhuan)向(xiang)(xiang)油缸之(zhi)間是(shi)液壓(ya)管(guan)或軟(ruan)管(guan)鏈接(jie)。當轉(zhuan)(zhuan)(zhuan)(zhuan)(zhuan)動(dong)(dong)(dong)方向(xiang)(xiang)盤(pan),轉(zhuan)(zhuan)(zhuan)(zhuan)(zhuan)向(xiang)(xiang)器(qi)(qi)(qi)根據方向(xiang)(xiang)盤(pan)轉(zhuan)(zhuan)(zhuan)(zhuan)(zhuan)動(dong)(dong)(dong)比(bi)例(li)輸(shu)送相對(dui)的(de)油量(liang),該(gai)油量(liang)直接(jie)流(liu)到(dao)操縱(zong)缸相應一(yi)側(ce),同時另(ling)一(yi)側(ce)的(de)油量(liang)回到(dao)油箱。轉(zhuan)(zhuan)(zhuan)(zhuan)(zhuan)向(xiang)(xiang)器(qi)(qi)(qi)按結構形(xing)式(shi)可(ke)分(fen)(fen)為(wei):有(you)齒(chi)(chi)輪齒(chi)(chi)條(tiao)式(shi)轉(zhuan)(zhuan)(zhuan)(zhuan)(zhuan)向(xiang)(xiang)器(qi)(qi)(qi)、蝸桿曲(qu)柄指銷式(shi)轉(zhuan)(zhuan)(zhuan)(zhuan)(zhuan)向(xiang)(xiang)器(qi)(qi)(qi)、循環(huan)(huan)球-齒(chi)(chi)條(tiao)齒(chi)(chi)扇式(shi)轉(zhuan)(zhuan)(zhuan)(zhuan)(zhuan)向(xiang)(xiang)器(qi)(qi)(qi)、循環(huan)(huan)球曲(qu)柄指銷式(shi)轉(zhuan)(zhuan)(zhuan)(zhuan)(zhuan)向(xiang)(xiang)器(qi)(qi)(qi)、蝸桿滾輪式(shi)轉(zhuan)(zhuan)(zhuan)(zhuan)(zhuan)向(xiang)(xiang)器(qi)(qi)(qi)等。按照助(zhu)力(li)(li)(li)形(xing)式(shi)又可(ke)以分(fen)(fen):為(wei)機械(xie)式(shi)(無助(zhu)力(li)(li)(li))轉(zhuan)(zhuan)(zhuan)(zhuan)(zhuan)向(xiang)(xiang)器(qi)(qi)(qi),和(he)(he)動(dong)(dong)(dong)力(li)(li)(li)式(shi)(有(you)助(zhu)力(li)(li)(li))轉(zhuan)(zhuan)(zhuan)(zhuan)(zhuan)向(xiang)(xiang)器(qi)(qi)(qi)兩種(zhong),其(qi)中動(dong)(dong)(dong)力(li)(li)(li)轉(zhuan)(zhuan)(zhuan)(zhuan)(zhuan)向(xiang)(xiang)器(qi)(qi)(qi)又可(ke)以分(fen)(fen)為(wei)氣壓(ya)動(dong)(dong)(dong)力(li)(li)(li)式(shi)、液壓(ya)動(dong)(dong)(dong)力(li)(li)(li)式(shi)、電(dian)動(dong)(dong)(dong)助(zhu)力(li)(li)(li)式(shi)、電(dian)液助(zhu)力(li)(li)(li)式(shi)等種(zhong)類。
QX56是(shi)日產(chan)品牌下的(de)(de)一款全(quan)尺寸豪華SUV,是(shi)“PathfinderArmada”的(de)(de)升(sheng)級版。QX56在2004年的(de)(de)底特(te)律車展(zhan)上(shang)首次(ci)亮相,并于當年春季上(shang)市銷售(shou)。QX56的(de)(de)設計(ji)和(he)(he)生產(chan)全(quan)部(bu)在美(mei)國(guo)進行,在密(mi)西西比制(zhi)造(zao),有(you)著(zhu)純正的(de)(de)美(mei)國(guo)血統。充分展(zhan)現美(mei)系大型(xing)SUV的(de)(de)特(te)點:大排量、身(shen)材龐(pang)大、外形兇猛(meng)、內(nei)部(bu)空間(jian)大。除此之外,QX56作為頂級豪華SUV,還(huan)格外重視駕駛者和(he)(he)乘坐者的(de)(de)舒適性和(he)(he)內(nei)部(bu)彰顯高貴身(shen)份的(de)(de)豪華性。
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