当传动轴带动缸体旋转时，斜盘将柱塞从缸体中拉出或推回，完成吸排油过程。柱塞与缸孔组成的工作容腔中的油液通过配油盘分别与泵的吸、排油腔相通。变量机构用来改变斜盘的倾角，通过调节斜盘的倾角可改变泵的排量。 力士乐变量柱塞泵a4vg系列特点：
1、斜盘式轴向柱塞变量泵，用于闭式回路静液压传动；
2、流量与驱动转速及排量成正比并可无级变量；
3、流量随斜盘摆角从零增加到大值；
4、使斜盘摆过中位可以平稳改变液流流动方向；
5、易与各种控制和调节系统匹配的多种变量方式；
6、泵在高压油侧配备两个溢流阀来保护静液压传动（泵和马达）免于超载；
7、高压溢流阀同时也具有补油阀的功能；
8、内置辅助泵用作补油泵和控制泵；
9、gao补油压力由一个内置补油溢流阀来限制；
10、全系列带有内置压力切断阀。 a10vso71dfr1/32r-vpb12n00
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ae-a10vso140d/31r-ppb12n00 德国力士乐变量柱塞泵华北总经销