德國REXROTH力士樂柱塞泵

德國REXROTH力士樂柱塞泵依靠柱塞與缸體內(nèi)孔面來形成密封工作容積的,。由于柱塞與缸體內(nèi)孔均為圓柱表面，因此加工方便,，配合精度高,，密封性能好。故柱塞泵常做成高壓泵,。
 優(yōu)點：壓力高,、結構緊湊、效率高及流量調(diào)節(jié)方便,。
 缺點：結構復雜,，價格較貴。
 柱塞泵按柱塞排列方向的不同,，分為軸向柱塞泵和徑向柱塞泵。在此,，簡要介紹軸向柱塞泵和回轉式徑向柱塞泵,。
– 斜軸結構軸向柱塞變量泵，用于開式回路的液壓傳動系統(tǒng),。
 　　– 適用于工程機械或工業(yè)領域,。
 　　– 多種變量方式適用于各種控制和調(diào)節(jié)過程。
 　　– 堅固的驅(qū)動軸圓錐滾子軸承使泵結構緊湊,，壽命長,。
 　　– 輸出流量與轉速和排量成正比，排量從Vg max至Vg min＝0無級可調(diào),。
1)軸向柱塞泵,。軸向柱塞泵由配流盤、缸體(轉子),、柱塞和斜盤等主要零件組成,。在配流盤上開有兩個弧形 溝槽，分別與泵的吸,、壓油口連通,，形成吸油腔和壓油腔。斜盤、配流盤均與泵體相固定,，柱塞在彈簧的作用下以球形端頭與斜盤接觸,。兩個弧形溝槽彼此隔開，保 持一定的密封性,。斜盤相對于缸體的夾角為γ,。原動機通過傳動軸帶動缸體旋轉，柱塞就在柱塞孔內(nèi)作軸向往復滑動,。處于π～2π范圍內(nèi)的柱塞向外伸出,，使其底 部的密封容積增大，將油吸入,；處于0～π范圍內(nèi)的柱塞向缸體內(nèi)壓入,，使其底部的密封容積減小，把油壓往系統(tǒng)中,。

rexroth力士樂軸向柱塞泵的工作原理  軸向柱塞泵是將多個柱塞配置在一個共同缸體的圓周上,并使柱塞中心線和缸體中心線平行的一種泵,。軸向柱塞泵有兩種形式,直軸式（斜盤式）和斜軸式（擺缸式）,如圖3-23所示為直軸式軸向柱塞泵的工作原理,這種泵主體由缸體1、配油盤2,、柱塞3和斜盤4組成,。柱塞沿圓周均勻分布在缸體內(nèi)。斜盤軸線與缸體軸線傾斜一角度,柱塞靠機械裝置或在低壓油作用下壓緊在斜盤上,配油盤2和斜盤4固定不轉,當原動機通過傳動軸使缸體轉動時,由于斜盤的作用,迫使柱塞在缸體內(nèi)作往復運動,并通過配油盤的配油窗口進行吸油和壓油,。如圖3-23中所示回轉方向,當缸體轉角在π～2π范圍內(nèi),柱塞向外伸出,柱塞底部缸孔的密封工作容積增大,通過配油盤的吸油窗口吸油;在0～π范圍內(nèi),柱塞被斜盤推入缸體,使缸孔容積減小,通過配油盤的壓油窗口壓油,。缸體每轉一周,每個柱塞各完成吸、壓油一次,如改變斜盤傾角,就能改變柱塞行程的長度,即改變液壓泵的排量,改變斜盤傾角方向,就能改變吸油和壓油的方向,即成為雙向變量泵,。

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