Pilot Valve (Swing Parking Brake)
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| 图 1 | g06292088 |
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回转停车制动器（释放） (1) 主控制阀 (2) 弹簧 (3) 滑阀 (4) 回转制动器解锁电磁阀 (5) 端口 (6) 管路 (7) 油道 (8) 回转马达 (9) 活塞室 (10) 弹簧 (11) 活塞 (12) 油缸 | |
回转停车制动器连接在回转马达 (8) 上。 回转停车制动器由弹簧 (10)、活塞 (11) 和摩擦盘组成。 摩擦盘内圆周上的齿与油缸 (12) 上的花键接合。
当操作员移动回转操纵杆时，主控制阀 (1) 中的回转制动器解锁电磁阀 (4) 激活。 滑阀 (3) 克服弹簧 (2) 的力移动，允许先导油流过管路 (6)。 先导油流入回转马达 (8) 上的端口 (5) 中，经油道 (7) 流向活塞室 (9)。 活塞室 (9) 中的先导油使活塞 (11) 移向左侧压缩弹簧 (10)。 释放将摩擦盘保持在回转马达 (8) 上的力。 回转停车制动器释放，上部结构可以自由回转。
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| 图 2 | g06292090 |
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回转停车制动器（接合） (1) 主控制阀 (2) 弹簧 (3) 滑阀 (4) 回转制动器解锁电磁阀 (5) 端口 (6) 管路 (7) 油道 (8) 回转马达 (9) 活塞室 (10) 弹簧 (11) 活塞 (12) 油缸 | |
当回转制动器解锁电磁阀 (4) 处于中间位置时，先导油不会通过管路 (6) 流向回转马达 (8) 的端口 (5)。 滑阀 (3) 在弹簧 (2) 的力作用下向上移动。 滑阀 (3) 阻止先导油通过油道 (7) 流向活塞室 (9)。 活塞 (11) 被弹簧 (10) 的力移到右边。 随着活塞 (11) 向右移动，摩擦盘被顶紧在回转马达壳体上。 此动作可防止上部结构旋转。
Caterpillar Information System:
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