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REXROTH比例閥是用于控制流量大小是通過(guò)比例電磁鐵(帶中心螺紋和可拆卸線圈)進(jìn)行控制里面的電磁鐵線圈可轉(zhuǎn)動(dòng),雙向流量控制 帶隱藏的輔助操作裝置,可選擇,若要使其工作點(diǎn)與汽車(chē)載荷的大小相適應(yīng),就必須能改變彈簧力的大小,這就是感載比例閥。閥體安裝在車(chē)架上,其中的活塞4右部的空腔內(nèi)有閥門(mén)2。不制動(dòng)時(shí),活塞在感載拉力彈簧6通過(guò)杠桿5施加的推力F作用下處于右端極限位置,閥門(mén)2因其桿部頂觸螺塞1而開(kāi)啟。
REXROTH比例閥一般采用兩端承壓面積不等的差徑活塞結(jié)構(gòu)。比例閥不工作時(shí),差徑活塞2在彈簧3的作用下處于上極限位置,此時(shí)閥門(mén)1保持開(kāi)啟,因而在輸入控制壓力P1與輸出壓力P2從零同步增長(zhǎng)的初始階段,總是P1等于P2。但是壓力P1的作用面積A1為π(D2-d2)/4,壓力P2的作用面積A2為πD2/4,因而A2大于A1,故活塞上方液壓作用力大于活塞下方液壓作用力。在P1、P2同步增長(zhǎng)過(guò)程中,當(dāng)活塞上、下兩端液壓作用之差超過(guò)彈簧3的預(yù)緊力時(shí),活塞便開(kāi)始下移。當(dāng)P1和P2增長(zhǎng)到一定值PS時(shí)活塞2內(nèi)腔中的閥座與閥門(mén)1接觸,進(jìn)油腔與出油腔即為隔絕,使比例閥進(jìn)入平衡狀態(tài)。若進(jìn)一步提高P1則活塞將回升,閥門(mén)再度開(kāi)啟,油液繼續(xù)流入出油腔而使P2不斷升高,但由于A2大于A1,P2尚未增長(zhǎng)到新的P1值,活塞又下降到平衡位置。在任一平衡狀態(tài)下,差徑活塞的力的平衡方程為:P2路A2=P1路A1+F。從而保證P2的增量小于P1的增量,若彈簧3的彈力F不變,則PS點(diǎn)不變,即比例閥節(jié)制后輪管路壓力的工作點(diǎn)與汽車(chē)的載荷無(wú)關(guān),這就是非感比例閥。
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