Piston Pump (Brake)
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| 图 1 | g00800485 |
(1) 活塞泵（制动） (2) 活塞 (3) 活塞 (4) 柱塞 (5) 旋转斜盘 (6) 泵控制阀 (7) 弹簧 (8) 滑阀 (9) 滑阀 (10) 弹簧 | |
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| 图 2 | g02460899 |
活塞泵 (1) 和泵控制阀 (6) 安装在发动机的左侧。 | |
制动活塞泵 (1) 为变量泵。 活塞泵的输出由旋转斜盘 (5) 的角度决定。 随着活塞 (3) 冲程的增加，更大的旋转斜盘角度产生更高的输出。 泵输出管路内的压力送往通过螺栓固定到活塞泵上的泵控制阀 (6) 。
活塞泵的输出由滑阀 (9) 控制。 在活塞泵输出所产生系统压力的作用下，滑阀可克服弹簧 (10) 发生移动。 弹簧和滑阀共同控制系统的最大压力。
当系统低于最大压力时，滑阀 (9) 在弹簧 (10) 的作用下固定不动。 系统压力和弹簧力作用到柱塞 (4) 上，而活塞 (2) 内的腔室经由节流孔与油箱相连。 旋转斜盘 (5) 移动到最大角度。
系统达到最大压力时，滑阀 (9) 克服弹簧 (10) 发生移动。 系统压力和弹簧力仍作用到柱塞 (4) 上，但压力还通过滑阀送入活塞 (2) 中。 活塞的移动使旋转斜盘向最小角度方向移动，并保持最大系统压力。
注: 弹簧 (7) 和滑阀 (8) 不参与系统的工作。
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