力士乐柱塞泵&力士乐变量柱塞泵

力士乐柱塞泵&力士乐变量柱塞泵
：宋珍
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公司： http://www.chem17.com/st210541
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变量柱塞泵概述及工作原理
变量柱塞泵的压力油经泵体、泵壳变量壳体中的通油孔通过单向阀进入变量壳体的下腔，
当拉杆向下运动时，推动伺服活塞向下移动，伺服阀的上阀口打开，
变量壳体下腔的压力油经变量活塞中的通油孔进入变量壳体上腔，
由于上腔面积大于下腔，液压力推动活塞向下运动，
带动销轴使变量头绕钢球中心旋转，改变变量头的倾斜角（增大），
柱塞泵的流量随之增大。反之拉杆向上运动，变量头的倾斜角向相反方向变化，
泵的流量也随之变化。当倾斜角度变至零以后，
则变量头向负偏角方向变化，液流产生换向，泵的进出油口变换。
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力士乐柱塞泵&力士乐变量柱塞泵
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