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轉(zhuan)(zhuan)(zhuan)(zhuan)向(xiang)(xiang)(xiang)機(ji)總成即轉(zhuan)(zhuan)(zhuan)(zhuan)向(xiang)(xiang)(xiang)器，又名轉(zhuan)(zhuan)(zhuan)(zhuan)向(xiang)(xiang)(xiang)機(ji)、方向(xiang)(xiang)(xiang)機(ji)，它是轉(zhuan)(zhuan)(zhuan)(zhuan)向(xiang)(xiang)(xiang)系中最重要的(de)部件。它的(de)作用是：增大轉(zhuan)(zhuan)(zhuan)(zhuan)向(xiang)(xiang)(xiang)盤傳到(dao)轉(zhuan)(zhuan)(zhuan)(zhuan)向(xiang)(xiang)(xiang)傳動(dong)(dong)機(ji)構的(de)力(li)(li)和改變力(li)(li)的(de)傳遞(di)方向(xiang)(xiang)(xiang)。轉(zhuan)(zhuan)(zhuan)(zhuan)向(xiang)(xiang)(xiang)器的(de)操縱是全液(ye)壓式(shi)(shi)(shi)，也就是說(shuo)在轉(zhuan)(zhuan)(zhuan)(zhuan)向(xiang)(xiang)(xiang)柱(zhu)和轉(zhuan)(zhuan)(zhuan)(zhuan)向(xiang)(xiang)(xiang)輪(lun)之(zhi)間沒有(you)機(ji)械連(lian)接，在轉(zhuan)(zhuan)(zhuan)(zhuan)向(xiang)(xiang)(xiang)器與轉(zhuan)(zhuan)(zhuan)(zhuan)向(xiang)(xiang)(xiang)油(you)缸(gang)之(zhi)間是液(ye)壓管或軟管鏈接。當(dang)轉(zhuan)(zhuan)(zhuan)(zhuan)動(dong)(dong)方向(xiang)(xiang)(xiang)盤，轉(zhuan)(zhuan)(zhuan)(zhuan)向(xiang)(xiang)(xiang)器根據方向(xiang)(xiang)(xiang)盤轉(zhuan)(zhuan)(zhuan)(zhuan)動(dong)(dong)比例輸送相對的(de)油(you)量，該油(you)量直(zhi)接流到(dao)操縱缸(gang)相應(ying)一側，同時另一側的(de)油(you)量回到(dao)油(you)箱。轉(zhuan)(zhuan)(zhuan)(zhuan)向(xiang)(xiang)(xiang)器按結構形(xing)式(shi)(shi)(shi)可分(fen)為：有(you)齒輪(lun)齒條式(shi)(shi)(shi)轉(zhuan)(zhuan)(zhuan)(zhuan)向(xiang)(xiang)(xiang)器、蝸(gua)桿曲柄(bing)指(zhi)銷式(shi)(shi)(shi)轉(zhuan)(zhuan)(zhuan)(zhuan)向(xiang)(xiang)(xiang)器、循(xun)環(huan)球-齒條齒扇式(shi)(shi)(shi)轉(zhuan)(zhuan)(zhuan)(zhuan)向(xiang)(xiang)(xiang)器、循(xun)環(huan)球曲柄(bing)指(zhi)銷式(shi)(shi)(shi)轉(zhuan)(zhuan)(zhuan)(zhuan)向(xiang)(xiang)(xiang)器、蝸(gua)桿滾輪(lun)式(shi)(shi)(shi)轉(zhuan)(zhuan)(zhuan)(zhuan)向(xiang)(xiang)(xiang)器等。按照(zhao)助力(li)(li)形(xing)式(shi)(shi)(shi)又可以分(fen)：為機(ji)械式(shi)(shi)(shi)（無(wu)助力(li)(li)）轉(zhuan)(zhuan)(zhuan)(zhuan)向(xiang)(xiang)(xiang)器，和動(dong)(dong)力(li)(li)式(shi)(shi)(shi)（有(you)助力(li)(li)）轉(zhuan)(zhuan)(zhuan)(zhuan)向(xiang)(xiang)(xiang)器兩種，其中動(dong)(dong)力(li)(li)轉(zhuan)(zhuan)(zhuan)(zhuan)向(xiang)(xiang)(xiang)器又可以分(fen)為氣壓動(dong)(dong)力(li)(li)式(shi)(shi)(shi)、液(ye)壓動(dong)(dong)力(li)(li)式(shi)(shi)(shi)、電(dian)動(dong)(dong)助力(li)(li)式(shi)(shi)(shi)、電(dian)液(ye)助力(li)(li)式(shi)(shi)(shi)等種類。
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