Slack Adjuster
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| 图 1 | g00803897 |
(1) 腔室 (2) 活塞 (3) 端口（制动器控制阀） (4) 活塞 (5) 腔室 (6) 端口（行车制动器） (A) 行车制动器接合。 (B) 行车制动器脱开。 | |
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| 图 2 | g00803902 |
前桥行车制动器的间隙调节器位于前桥上。 | |
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| 图 3 | g00803901 |
中心桥行车制动器的间隙调节器位于中心桥上。 | |
间隙调节器补偿行车制动器中的磨损量。 间隙调节器确保行车制动器磨损后，接合行车制动器仍需要同样的时间和同样的力度。
踩下驾驶室中的踏板后，制动器控制阀中的压力经端口 (3) 传递到间隙调节器中。 活塞 (2) 从间隙调节器的中心移开，腔室 (1) 中的机油经过端口 (6) 输送到行车制动器中。
如果活塞达到全行程但行车制动器由于磨损而没有完全接合，则腔室 (5) 中的压力将大于腔室 (1) 与连至行车制动器的管路中的压力。 压差使活塞 (4) 朝间隙调节器的中心移动，接合行车制动器所需要的更多机油流入腔室 (1) 。
松开驾驶室中的踏板时，腔室 (5) 中的压力降为零。 活塞 (4) 从间隙调节器的中心移开，将正确量的机油锁定在行车制动器和腔室 (1) 内。 行车制动器内的弹簧脱开行车制动器。 机油经过端口 (6) 输送到腔室 (1) 内，活塞 (2) 朝调节器的中心移动。 活塞 (2) 保持在中心位置，直到再次踩下驾驶室中的踏板。
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