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1、按流量是否可調(diào)節(jié)可分為：變量泵和定量泵。輸出流量可以根據(jù)需要來調(diào)節(jié)的稱為變量泵，流量不能調(diào)節(jié)的稱為定量泵。
2、按液壓系統(tǒng)中常用的泵結(jié)構(gòu)分為：齒輪泵、葉片泵和柱塞泵3種。
【液壓泵的工作原理】
1、齒輪泵
齒輪泵具有體積小，結(jié)構(gòu)簡單，抗污染性強(qiáng)，價(jià)格便宜，以及泄漏大，噪聲大，流量脈動(dòng)大，排量不能調(diào)節(jié)等特點(diǎn)。
齒輪泵是由兩個(gè)齒輪互相嚙合，當(dāng)馬達(dá)或者引擎帶動(dòng)其中一個(gè)齒輪的時(shí)候，與之嚙合的另一個(gè)齒輪會(huì)同時(shí)旋轉(zhuǎn)。
這對齒輪相互旋轉(zhuǎn)，在嚙合齒的一側(cè)輪齒逐漸脫開，密封腔容積增大，形成了局部真空，油箱當(dāng)中的液壓油在大氣壓的作用下被吸進(jìn)來填補(bǔ)不斷增大的容積，被吸進(jìn)來的液壓油將齒槽填滿，并隨著齒槽旋轉(zhuǎn)，將油液帶到嚙合區(qū)另一側(cè)的壓油腔中，兩個(gè)齒輪嚙合線將吸油腔和壓油腔分隔開，使得吸油區(qū)和壓油區(qū)之間不會(huì)產(chǎn)生液壓油泄漏，齒輪不斷旋轉(zhuǎn)完成一次次的吸油壓油過程。