轉(zhuan)(zhuan)(zhuan)向(xiang)(xiang)機(ji)(ji)總成即轉(zhuan)(zhuan)(zhuan)向(xiang)(xiang)器(qi)(qi)(qi)(qi),又(you)名轉(zhuan)(zhuan)(zhuan)向(xiang)(xiang)機(ji)(ji)、方(fang)向(xiang)(xiang)機(ji)(ji),它(ta)是轉(zhuan)(zhuan)(zhuan)向(xiang)(xiang)系中最重(zhong)要的(de)部件。它(ta)的(de)作用是:增大轉(zhuan)(zhuan)(zhuan)向(xiang)(xiang)盤傳(chuan)到(dao)轉(zhuan)(zhuan)(zhuan)向(xiang)(xiang)傳(chuan)動(dong)機(ji)(ji)構的(de)力(li)(li)(li)和(he)改(gai)變力(li)(li)(li)的(de)傳(chuan)遞方(fang)向(xiang)(xiang)。轉(zhuan)(zhuan)(zhuan)向(xiang)(xiang)器(qi)(qi)(qi)(qi)的(de)操縱是全液壓(ya)(ya)式(shi)(shi),也就是說(shuo)在轉(zhuan)(zhuan)(zhuan)向(xiang)(xiang)柱和(he)轉(zhuan)(zhuan)(zhuan)向(xiang)(xiang)輪之間沒有機(ji)(ji)械連接,在轉(zhuan)(zhuan)(zhuan)向(xiang)(xiang)器(qi)(qi)(qi)(qi)與(yu)轉(zhuan)(zhuan)(zhuan)向(xiang)(xiang)油缸之間是液壓(ya)(ya)管或(huo)軟管鏈接。當轉(zhuan)(zhuan)(zhuan)動(dong)方(fang)向(xiang)(xiang)盤,轉(zhuan)(zhuan)(zhuan)向(xiang)(xiang)器(qi)(qi)(qi)(qi)根據方(fang)向(xiang)(xiang)盤轉(zhuan)(zhuan)(zhuan)動(dong)比例輸(shu)送(song)相對的(de)油量,該油量直接流到(dao)操縱缸相應一側(ce),同時另一側(ce)的(de)油量回到(dao)油箱。轉(zhuan)(zhuan)(zhuan)向(xiang)(xiang)器(qi)(qi)(qi)(qi)按(an)結構形式(shi)(shi)可分(fen)為:有齒輪齒條式(shi)(shi)轉(zhuan)(zhuan)(zhuan)向(xiang)(xiang)器(qi)(qi)(qi)(qi)、蝸(gua)桿曲(qu)柄指銷(xiao)式(shi)(shi)轉(zhuan)(zhuan)(zhuan)向(xiang)(xiang)器(qi)(qi)(qi)(qi)、循環球(qiu)-齒條齒扇式(shi)(shi)轉(zhuan)(zhuan)(zhuan)向(xiang)(xiang)器(qi)(qi)(qi)(qi)、循環球(qiu)曲(qu)柄指銷(xiao)式(shi)(shi)轉(zhuan)(zhuan)(zhuan)向(xiang)(xiang)器(qi)(qi)(qi)(qi)、蝸(gua)桿滾輪式(shi)(shi)轉(zhuan)(zhuan)(zhuan)向(xiang)(xiang)器(qi)(qi)(qi)(qi)等(deng)。按(an)照助(zhu)(zhu)力(li)(li)(li)形式(shi)(shi)又(you)可以(yi)(yi)分(fen):為機(ji)(ji)械式(shi)(shi)(無助(zhu)(zhu)力(li)(li)(li))轉(zhuan)(zhuan)(zhuan)向(xiang)(xiang)器(qi)(qi)(qi)(qi),和(he)動(dong)力(li)(li)(li)式(shi)(shi)(有助(zhu)(zhu)力(li)(li)(li))轉(zhuan)(zhuan)(zhuan)向(xiang)(xiang)器(qi)(qi)(qi)(qi)兩種(zhong),其(qi)中動(dong)力(li)(li)(li)轉(zhuan)(zhuan)(zhuan)向(xiang)(xiang)器(qi)(qi)(qi)(qi)又(you)可以(yi)(yi)分(fen)為氣壓(ya)(ya)動(dong)力(li)(li)(li)式(shi)(shi)、液壓(ya)(ya)動(dong)力(li)(li)(li)式(shi)(shi)、電動(dong)助(zhu)(zhu)力(li)(li)(li)式(shi)(shi)、電液助(zhu)(zhu)力(li)(li)(li)式(shi)(shi)等(deng)種(zhong)類。
沃爾沃公司除了大(da)客車(che)、各種(zhong)載貨車(che)在北歐(ou)占絕(jue)對統(tong)治(zhi)地位(wei)外(wai),它的小客車(che)在世界(jie)上也小有名氣因而把工人從機械往(wang)復式(shi)勞動中(zhong)解(jie)放出來,激發了工人的勞動熱情。這種(zhong)生產(chan)方式(shi)是繼福特流水線生產(chan)方式(shi)之后的又一重(zhong)大(da)變革,引起世界(jie)產(chan)業界(jie)的極大(da)關(guan)注。
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