轉(zhuan)向(xiang)(xiang)(xiang)機(ji)(ji)總成即轉(zhuan)向(xiang)(xiang)(xiang)器(qi)(qi)(qi)(qi)(qi),又名轉(zhuan)向(xiang)(xiang)(xiang)機(ji)(ji)、方向(xiang)(xiang)(xiang)機(ji)(ji),它是轉(zhuan)向(xiang)(xiang)(xiang)系中最重要的(de)部件。它的(de)作用(yong)是:增(zeng)大轉(zhuan)向(xiang)(xiang)(xiang)盤傳到(dao)(dao)轉(zhuan)向(xiang)(xiang)(xiang)傳動(dong)(dong)機(ji)(ji)構(gou)的(de)力(li)(li)(li)(li)和改變力(li)(li)(li)(li)的(de)傳遞(di)方向(xiang)(xiang)(xiang)。轉(zhuan)向(xiang)(xiang)(xiang)器(qi)(qi)(qi)(qi)(qi)的(de)操縱是全液壓(ya)式(shi)(shi)(shi),也就(jiu)是說在(zai)轉(zhuan)向(xiang)(xiang)(xiang)柱和轉(zhuan)向(xiang)(xiang)(xiang)輪(lun)之間沒有機(ji)(ji)械連接(jie),在(zai)轉(zhuan)向(xiang)(xiang)(xiang)器(qi)(qi)(qi)(qi)(qi)與轉(zhuan)向(xiang)(xiang)(xiang)油缸(gang)之間是液壓(ya)管或(huo)軟管鏈接(jie)。當轉(zhuan)動(dong)(dong)方向(xiang)(xiang)(xiang)盤,轉(zhuan)向(xiang)(xiang)(xiang)器(qi)(qi)(qi)(qi)(qi)根(gen)據方向(xiang)(xiang)(xiang)盤轉(zhuan)動(dong)(dong)比例(li)輸送(song)相對(dui)的(de)油量,該油量直接(jie)流到(dao)(dao)操縱缸(gang)相應一(yi)側(ce),同(tong)時另(ling)一(yi)側(ce)的(de)油量回(hui)到(dao)(dao)油箱。轉(zhuan)向(xiang)(xiang)(xiang)器(qi)(qi)(qi)(qi)(qi)按結構(gou)形式(shi)(shi)(shi)可分為:有齒輪(lun)齒條(tiao)式(shi)(shi)(shi)轉(zhuan)向(xiang)(xiang)(xiang)器(qi)(qi)(qi)(qi)(qi)、蝸桿(gan)曲柄指銷式(shi)(shi)(shi)轉(zhuan)向(xiang)(xiang)(xiang)器(qi)(qi)(qi)(qi)(qi)、循(xun)環(huan)球-齒條(tiao)齒扇式(shi)(shi)(shi)轉(zhuan)向(xiang)(xiang)(xiang)器(qi)(qi)(qi)(qi)(qi)、循(xun)環(huan)球曲柄指銷式(shi)(shi)(shi)轉(zhuan)向(xiang)(xiang)(xiang)器(qi)(qi)(qi)(qi)(qi)、蝸桿(gan)滾輪(lun)式(shi)(shi)(shi)轉(zhuan)向(xiang)(xiang)(xiang)器(qi)(qi)(qi)(qi)(qi)等(deng)。按照助(zhu)力(li)(li)(li)(li)形式(shi)(shi)(shi)又可以(yi)分:為機(ji)(ji)械式(shi)(shi)(shi)(無助(zhu)力(li)(li)(li)(li))轉(zhuan)向(xiang)(xiang)(xiang)器(qi)(qi)(qi)(qi)(qi),和動(dong)(dong)力(li)(li)(li)(li)式(shi)(shi)(shi)(有助(zhu)力(li)(li)(li)(li))轉(zhuan)向(xiang)(xiang)(xiang)器(qi)(qi)(qi)(qi)(qi)兩種,其中動(dong)(dong)力(li)(li)(li)(li)轉(zhuan)向(xiang)(xiang)(xiang)器(qi)(qi)(qi)(qi)(qi)又可以(yi)分為氣(qi)壓(ya)動(dong)(dong)力(li)(li)(li)(li)式(shi)(shi)(shi)、液壓(ya)動(dong)(dong)力(li)(li)(li)(li)式(shi)(shi)(shi)、電(dian)動(dong)(dong)助(zhu)力(li)(li)(li)(li)式(shi)(shi)(shi)、電(dian)液助(zhu)力(li)(li)(li)(li)式(shi)(shi)(shi)等(deng)種類。
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