故傳動較平穩(wěn)。工作機構的變速和換向靠調節(jié)泵或馬達的變量機構實現，避免了開式系統(tǒng)換向過程中所出現的液壓沖擊和能量損失。但閉式系統(tǒng)較開式系統(tǒng)復雜，因無油箱，油液的散熱和過濾條件較差。為補償系統(tǒng)中的泄漏，通常需要一個小流量的補油泵

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