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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孔面來形成密封工作容積的,。由于柱塞與缸體內孔均為圓柱表面,，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節(jié)過程。
 　　– 堅固的驅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,。
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,，柱塞就在柱塞孔內作軸向往復滑動。處于π～2π范圍內的柱塞向外伸出,，使其底 部的密封容積增大,，將油吸入；處于0～π范圍內的柱塞向缸體內壓入,，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,。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（圖中為彈簧）,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,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,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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