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轉(zhuan)(zhuan)(zhuan)向(xiang)(xiang)(xiang)機(ji)總成即轉(zhuan)(zhuan)(zhuan)向(xiang)(xiang)(xiang)器(qi)(qi)(qi)，又(you)名轉(zhuan)(zhuan)(zhuan)向(xiang)(xiang)(xiang)機(ji)、方向(xiang)(xiang)(xiang)機(ji)，它是轉(zhuan)(zhuan)(zhuan)向(xiang)(xiang)(xiang)系中(zhong)最重要的(de)(de)部件。它的(de)(de)作用是：增大轉(zhuan)(zhuan)(zhuan)向(xiang)(xiang)(xiang)盤傳到(dao)轉(zhuan)(zhuan)(zhuan)向(xiang)(xiang)(xiang)傳動(dong)(dong)機(ji)構的(de)(de)力(li)(li)(li)和改(gai)變力(li)(li)(li)的(de)(de)傳遞方向(xiang)(xiang)(xiang)。轉(zhuan)(zhuan)(zhuan)向(xiang)(xiang)(xiang)器(qi)(qi)(qi)的(de)(de)操縱是全液壓式(shi)(shi)(shi)(shi)，也就是說在轉(zhuan)(zhuan)(zhuan)向(xiang)(xiang)(xiang)柱和轉(zhuan)(zhuan)(zhuan)向(xiang)(xiang)(xiang)輪之(zhi)間沒有(you)(you)機(ji)械(xie)(xie)連接(jie)，在轉(zhuan)(zhuan)(zhuan)向(xiang)(xiang)(xiang)器(qi)(qi)(qi)與轉(zhuan)(zhuan)(zhuan)向(xiang)(xiang)(xiang)油缸之(zhi)間是液壓管或軟管鏈接(jie)。當(dang)轉(zhuan)(zhuan)(zhuan)動(dong)(dong)方向(xiang)(xiang)(xiang)盤，轉(zhuan)(zhuan)(zhuan)向(xiang)(xiang)(xiang)器(qi)(qi)(qi)根據方向(xiang)(xiang)(xiang)盤轉(zhuan)(zhuan)(zhuan)動(dong)(dong)比(bi)例輸送相對的(de)(de)油量(liang)，該油量(liang)直接(jie)流到(dao)操縱缸相應一側，同時另一側的(de)(de)油量(liang)回到(dao)油箱。轉(zhuan)(zhuan)(zhuan)向(xiang)(xiang)(xiang)器(qi)(qi)(qi)按結構形(xing)式(shi)(shi)(shi)(shi)可(ke)分(fen)(fen)(fen)為(wei)(wei)：有(you)(you)齒(chi)輪齒(chi)條式(shi)(shi)(shi)(shi)轉(zhuan)(zhuan)(zhuan)向(xiang)(xiang)(xiang)器(qi)(qi)(qi)、蝸(gua)桿(gan)曲(qu)柄指銷式(shi)(shi)(shi)(shi)轉(zhuan)(zhuan)(zhuan)向(xiang)(xiang)(xiang)器(qi)(qi)(qi)、循(xun)(xun)環(huan)球-齒(chi)條齒(chi)扇式(shi)(shi)(shi)(shi)轉(zhuan)(zhuan)(zhuan)向(xiang)(xiang)(xiang)器(qi)(qi)(qi)、循(xun)(xun)環(huan)球曲(qu)柄指銷式(shi)(shi)(shi)(shi)轉(zhuan)(zhuan)(zhuan)向(xiang)(xiang)(xiang)器(qi)(qi)(qi)、蝸(gua)桿(gan)滾輪式(shi)(shi)(shi)(shi)轉(zhuan)(zhuan)(zhuan)向(xiang)(xiang)(xiang)器(qi)(qi)(qi)等。按照助(zhu)力(li)(li)(li)形(xing)式(shi)(shi)(shi)(shi)又(you)可(ke)以(yi)分(fen)(fen)(fen)：為(wei)(wei)機(ji)械(xie)(xie)式(shi)(shi)(shi)(shi)（無(wu)助(zhu)力(li)(li)(li)）轉(zhuan)(zhuan)(zhuan)向(xiang)(xiang)(xiang)器(qi)(qi)(qi)，和動(dong)(dong)力(li)(li)(li)式(shi)(shi)(shi)(shi)（有(you)(you)助(zhu)力(li)(li)(li)）轉(zhuan)(zhuan)(zhuan)向(xiang)(xiang)(xiang)器(qi)(qi)(qi)兩(liang)種(zhong)(zhong)，其(qi)中(zhong)動(dong)(dong)力(li)(li)(li)轉(zhuan)(zhuan)(zhuan)向(xiang)(xiang)(xiang)器(qi)(qi)(qi)又(you)可(ke)以(yi)分(fen)(fen)(fen)為(wei)(wei)氣壓動(dong)(dong)力(li)(li)(li)式(shi)(shi)(shi)(shi)、液壓動(dong)(dong)力(li)(li)(li)式(shi)(shi)(shi)(shi)、電(dian)(dian)動(dong)(dong)助(zhu)力(li)(li)(li)式(shi)(shi)(shi)(shi)、電(dian)(dian)液助(zhu)力(li)(li)(li)式(shi)(shi)(shi)(shi)等種(zhong)(zhong)類。
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