Hydraulic Schematic (Canopy System)
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| 图 1 | g03389408 |
顶篷液压系统 (1) 顶篷油缸 (2) 主安全阀 (3) 马达和泵总成 (4) 控制阀 (5) 单向阀 | |
电动马达和泵总成 (3) 内部有电动马达、液压泵、油箱和电磁操作阀。 马达和泵总成运行时，液压泵经吸入滤网从液压油箱中吸油。 泵经单向阀 (5) 将油供至控制阀 (4) 。
该供油被输送至控制阀 (4) 和主安全阀 (2) 。 顶篷位于保持位置时，控制阀上的电磁阀不通电。 控制阀阻断液压油流动，将机油截留到顶篷油缸 (1) 和单向阀 (5) 中。 随着压力的增大，主安全阀打开，机油流到油箱。
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| 图 2 | g03389439 |
顶篷提升液压系统 (1) 顶篷油缸 (2) 主安全阀 (3) 马达和泵总成 (4) 控制阀 (5) 单向阀 | |
马达和泵总成 (3) 运行时，液压泵经吸入滤网从液压油箱中吸油。 泵经单向阀将油供至控制阀 (4) 。
升起顶篷时，控制阀内的提升电磁阀通电。 机油流经控制阀，通过管路上的单向阀进入油缸缸盖。 机油还将管路中单向阀上的压力供至油缸连杆端。 压力减小的机油将压力供至顶篷油缸 (1) 的缸盖。
随着顶篷油缸 (1) 缸盖的压力增大，管路中单向阀到油缸连杆端的压力增大。 该单向阀开启，机油从油缸连杆端流经控制阀 (4) 。 回油流至油箱。
顶篷下降时，控制阀 (4) 上的下降电磁阀通电。 机油流经单向阀，并向顶篷油缸 (1) 的连杆端供压。
随着顶篷油缸 (1) 连杆端的压力增大，管路中单向阀到油缸缸盖的压力增大。 该单向阀开启，机油从油缸缸盖流经控制阀 (4) 。 回油流至油箱。
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