Air Control Valve (Parking Brake)
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| 图 1 | g00875376 |
停车制动器空气控制阀的位置 (2) 停车制动器操纵杆 | |
停车制动器空气控制阀位于控制台中。 停车制动器控制阀控制流向停车制动器和辅助制动器阀门的气流。
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| 图 2 | g00446883 |
(1) 柱塞 (2) 操纵杆 (3) 柱塞中的通道 (4) 排气通道 (5) 输送通道 (6) 弹簧 (7) 进气阀 (8) 阀座 (9) 弹簧 (10) 供气通道 | |
当操纵杆 (2) 处于 OFF 位置时，操纵杆 (2) 会将柱塞 (1) 向下推。 柱塞 (1) 将进气阀 (7) 移离阀座 (8) 。 柱塞 (1) 还会堵住排气通道 (4) 。 供气通道 (10) 中的气压将绕过进气阀 (7) 流至输送通道 (5) 。
空气将从输送通道 (5) 流出，进入停车制动器和辅助制动器阀门。 气流会将停车制动器和辅助制动器阀门中的滑阀向下推。 这样，油流即可释放弹簧接合的停车制动器。
当操纵杆 (2) 移至 ON 位置时，操纵杆 (2) 将释放柱塞 (1) 。 弹簧 (6) 提升柱塞 (1) ，使其离开进气阀 (7) 。 弹簧 (9) 将进气阀 (7) 推向阀座 (8) 。 供气通道 (10) 中的气流被堵住。 输送通道 (5) 保持打开状态。 停车制动器和辅助制动器阀门中的空气流经柱塞 (1) 中的通道 (3) 中。 这部分空气将通过排气通道 (4) 离开停车制动器控制阀。
当流向停车制动器和辅助制动器阀门的气源被切断后，停车制动器和辅助制动器阀门中的弹簧将会移动滑阀， 阻止机油流向停车制动器的油室。 停车制动器将会接合。
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