988K XE Wheel Loader Caterpillar


Brake Control Valve (Parking)

Usage:

988K XE E8X



图 1g03392164

停车制动器控制阀总览

(6) 监控器显示屏

(7) Can 数据链路

(8) 动力传动系 ECM

(9) 停车制动器开关(驾驶室)

(10) 停车制动器压力传感器

(11) 电磁阀控制先导阀

(12) 制动系统压力传感器




图 2g03392105

349-4389 制动器控制阀总成

(1) 至停车制动器的出口端口 (C)

(2) 压力传感器端口 (GP)

(3) 蓄能器管路压力端口 (P)

(4) 至油箱的管路端口 (T)

(5) 电磁阀控制先导阀

停车制动器控制阀位于驾驶室下方的机架顶部。 停车制动器控制阀将油流导向停车制动器。 电磁阀控制先导阀从端口 "P"(3)接收机油,用于移动停车制动器控制阀中的方向滑阀。 驾驶室中的停车制动器开关接通时,动力传动系 ECM 将停车制动器电磁阀控制先导阀 (5) 断电。 先导阀将先导信号压力从滑阀端部排到油箱出口端口" T"(3)。 弹簧力移动滑阀,阻止机从端口 "P"(3)流到停车制动器端口 "C"(1),并使停车制动器中的机油可流经端口 "C"(1),经端口 "T"(4)流回油箱。 弹簧力接合停车制动器。

驾驶室中的停车制动器开关断开时,动力传动系 ECM 将停车制动器电磁阀控制先导阀 (5) 通电。 先导阀将信号压力输送到滑阀端部。 滑阀移动并将机油从端口 "P" (3) 导向端口 "C" (1) ,并使压力释放停车制动器。

端口 "GP" (2) 上的停车制动器传感器向动力传动系 ECM 发送信号,指示停车制动器压力。

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