力士樂柱塞泵&力士樂變量柱塞泵
：宋珍
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變量柱塞泵概述及工作原理
變量柱塞泵的壓力油經(jīng)泵體、泵殼變量殼體中的通油孔通過單向閥進(jìn)入變量殼體的下腔，
當(dāng)拉桿向下運(yùn)動時，推動伺服活塞向下移動，伺服閥的上閥口打開，
變量殼體下腔的壓力油經(jīng)變量活塞中的通油孔進(jìn)入變量殼體上腔，
由于上腔面積大于下腔，液壓力推動活塞向下運(yùn)動，
帶動銷軸使變量頭繞鋼球中心旋轉(zhuǎn)，改變變量頭的傾斜角（增大），
柱塞泵的流量隨之增大。反之拉桿向上運(yùn)動，變量頭的傾斜角向相反方向變化，
泵的流量也隨之變化。當(dāng)傾斜角度變至零以后，
則變量頭向負(fù)偏角方向變化，液流產(chǎn)生換向，泵的進(jìn)出油口變換。
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力士樂柱塞泵&力士樂變量柱塞泵
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