Fan Drive
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图 1 | g00714447 |
风扇驱动装置 |
风扇离合器为机械驱动式离合器, 它使用机油进行润滑和冷却。 已经过滤和冷却的发动机润滑油通过管道输送到风扇离合器。 内部的孔道可分配润滑油和冷却油。 风扇离合器包含多个离合器片。 通过油压启动风扇离合器。 油压通过调节风扇离合器的开合控制风扇转速。
没有控制压力时,风扇以最低转速 100 转/分至 300 转/分运转。 施加恒定的控制油压时,风扇以 800 转/分至 1150 转/分的转速运转。 最大风扇转速取决于应用场合。
风扇离合器所需的冷却油量取决于以下输入信息:
- 冷却液温度
- 制动器油温
- 后冷器温度
- 空调压力(如有配备)
风扇驱动阀可调节风扇离合器的控制油压。 调节幅度取决于冷却液温度传感器和制动器油温传感器输入的信息。 达到启动温度时,后冷器温度开关会超弛送往风扇驱动阀的信号。 达到启动压力时,空调压力开关可超弛送往风扇驱动阀的信号。 出现以下情况时,取代可提供最大风扇转速:
- 排气温度高
- 空调(如有配备)负荷重
- 大幅度减速
风扇驱动阀可调节风扇离合器的控制压力。 调节控制压力可平稳地改变风扇转速。 调节控制压力可使油冷式离合器片滑动。 这种滑动可导致风扇转速改变。
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