力士樂液壓系統(tǒng)按油液的循環(huán)方式,，液壓系統(tǒng)可分為開式系統(tǒng)和閉式系統(tǒng)。開式系統(tǒng)是指液壓泵從油箱吸油,，油經(jīng)各種控制閥后,，驅(qū)動(dòng)液壓執(zhí)行元件，回油再經(jīng)過換向閥回油箱,。這種系統(tǒng)結(jié)構(gòu)較為簡單,，可以發(fā)揮油箱的散熱、沉淀雜質(zhì)作用,，但因油液常與空氣接觸,，使空氣易于滲入系統(tǒng)，導(dǎo)致機(jī)構(gòu)運(yùn)動(dòng)不平穩(wěn)等后果,。開式系統(tǒng)油箱大,，油泵自吸性能好。閉式系統(tǒng)中,，液壓泵的進(jìn)油管直接與執(zhí)行元件的回油管相連,，工作液體在系統(tǒng)的管路中進(jìn)行封閉循環(huán)。其結(jié)構(gòu)緊湊,，與空氣接觸機(jī)會(huì)少,，空氣不易滲入系統(tǒng)，故傳動(dòng)較平穩(wěn),。工作機(jī)構(gòu)的變速和換向靠調(diào)節(jié)泵或馬達(dá)的變量機(jī)構(gòu)實(shí)現(xiàn),，避免了開式系統(tǒng)換向過程中所出現(xiàn)的液壓沖擊和能量損失。但閉式系統(tǒng)較開式系統(tǒng)復(fù)雜,，因無油箱,，油液的散熱和過濾條件較差。為補(bǔ)償系統(tǒng)中的泄漏，通常需要一個(gè)小流量的補(bǔ)油泵和油箱,。

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