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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)，又(you)(you)名轉(zhuan)(zhuan)(zhuan)向(xiang)(xiang)(xiang)機(ji)、方(fang)向(xiang)(xiang)(xiang)機(ji)，它是轉(zhuan)(zhuan)(zhuan)向(xiang)(xiang)(xiang)系(xi)中(zhong)最(zui)重(zhong)要(yao)的部件。它的作(zuo)用是：增(zeng)大轉(zhuan)(zhuan)(zhuan)向(xiang)(xiang)(xiang)盤(pan)傳(chuan)到(dao)轉(zhuan)(zhuan)(zhuan)向(xiang)(xiang)(xiang)傳(chuan)動(dong)(dong)機(ji)構(gou)的力(li)和改變力(li)的傳(chuan)遞方(fang)向(xiang)(xiang)(xiang)。轉(zhuan)(zhuan)(zhuan)向(xiang)(xiang)(xiang)器(qi)(qi)的操(cao)縱是全液(ye)(ye)壓(ya)式(shi)，也就(jiu)是說在轉(zhuan)(zhuan)(zhuan)向(xiang)(xiang)(xiang)柱和轉(zhuan)(zhuan)(zhuan)向(xiang)(xiang)(xiang)輪(lun)(lun)(lun)之(zhi)(zhi)間沒有機(ji)械(xie)連接(jie)，在轉(zhuan)(zhuan)(zhuan)向(xiang)(xiang)(xiang)器(qi)(qi)與(yu)轉(zhuan)(zhuan)(zhuan)向(xiang)(xiang)(xiang)油缸(gang)之(zhi)(zhi)間是液(ye)(ye)壓(ya)管或軟管鏈(lian)接(jie)。當轉(zhuan)(zhuan)(zhuan)動(dong)(dong)方(fang)向(xiang)(xiang)(xiang)盤(pan)，轉(zhuan)(zhuan)(zhuan)向(xiang)(xiang)(xiang)器(qi)(qi)根據方(fang)向(xiang)(xiang)(xiang)盤(pan)轉(zhuan)(zhuan)(zhuan)動(dong)(dong)比例輸送(song)相(xiang)對的油量，該油量直接(jie)流到(dao)操(cao)縱缸(gang)相(xiang)應(ying)一(yi)側，同時另一(yi)側的油量回(hui)到(dao)油箱。轉(zhuan)(zhuan)(zhuan)向(xiang)(xiang)(xiang)器(qi)(qi)按(an)結構(gou)形式(shi)可(ke)分(fen)為：有齒輪(lun)(lun)(lun)齒條式(shi)轉(zhuan)(zhuan)(zhuan)向(xiang)(xiang)(xiang)器(qi)(qi)、蝸桿曲柄指銷式(shi)轉(zhuan)(zhuan)(zhuan)向(xiang)(xiang)(xiang)器(qi)(qi)、循環球-齒條齒扇式(shi)轉(zhuan)(zhuan)(zhuan)向(xiang)(xiang)(xiang)器(qi)(qi)、循環球曲柄指銷式(shi)轉(zhuan)(zhuan)(zhuan)向(xiang)(xiang)(xiang)器(qi)(qi)、蝸桿滾輪(lun)(lun)(lun)式(shi)轉(zhuan)(zhuan)(zhuan)向(xiang)(xiang)(xiang)器(qi)(qi)等。按(an)照助力(li)形式(shi)又(you)(you)可(ke)以(yi)分(fen)：為機(ji)械(xie)式(shi)（無助力(li)）轉(zhuan)(zhuan)(zhuan)向(xiang)(xiang)(xiang)器(qi)(qi)，和動(dong)(dong)力(li)式(shi)（有助力(li)）轉(zhuan)(zhuan)(zhuan)向(xiang)(xiang)(xiang)器(qi)(qi)兩種，其(qi)中(zhong)動(dong)(dong)力(li)轉(zhuan)(zhuan)(zhuan)向(xiang)(xiang)(xiang)器(qi)(qi)又(you)(you)可(ke)以(yi)分(fen)為氣壓(ya)動(dong)(dong)力(li)式(shi)、液(ye)(ye)壓(ya)動(dong)(dong)力(li)式(shi)、電動(dong)(dong)助力(li)式(shi)、電液(ye)(ye)助力(li)式(shi)等種類。
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