推荐回答(2个)
硅油风扇离合器,用硅油作为介质,利用硅油高粘度的特性传递扭矩。利用散热器后面空气的温度,通过感温器自动控制风扇离合器的分离和接合。温度低时,硅油不流动,风扇离合器分离,风扇转速减慢,基本上是空转。温度高时,硅油的粘度使风扇离合器结合,于是风扇和水泵轴一起旋转,起到调节发动机温度的作用。
当发动机负荷增大,冷却液温度升高时,通过散热器芯部气流的温度也随之升高。高温气流吹在双金属感温器上,使双金属片受热变形,带动阀片传动销和控制阀片偏转一个角度。气流温度超过65℃后,从动板上的进油孔A被打开,贮油腔中的硅油通过此孔进入工作腔中。
粘性的硅油流进主动板与从动板及主动板与离合器壳体之间的间隙中,将主动板上的转矩传给离合器壳体,带动风扇高速旋转,离合器此时处于接合状态。进入工作腔的硅油在离心力的作用下甩向外缘,顶开单向阀1并通过从动板上的回油孔B流回贮油腔,然后再进入工作腔。如此反复,形成循环。硅油在循环时将热量传给铸有散热片的前盖和离合器外壳而得到冷却,以避免工作时硅油温度过高。
当发动机因负荷下降等原因,吹向双金属片感温器的气流温度低于35℃时,控制阀片将进油孔A关闭,硅油不再进入工作腔,而原来在工作腔中的硅油仍不断地在离心力作用下返回贮油腔,直至排空为止。离合器此时又处于分离状态,风扇空转打滑。
1、构造如下图,原理是:
用硅油作为介质,利用硅油高粘度的特性传递扭矩。利用散热器后面空气的温度,通过感温器自动控制风扇离合器的分离和接合。温度低时,硅油不流动,风扇离合器分离,风扇转速减慢,基本上是空转。温度高时,硅油的粘度使风扇离合器结合,于是风扇和水泵轴一起旋转,起到调节发动机温度的作用。
2、硅油风扇离合器的工作过程:
1)当流经散热器的空气温度升高时,双金属感温器受热变形,迫使阀片轴转动,打开从动板上进油孔。从动板与前盖之间贮存的硅油便流入主动板与从动板之间的工作腔,离合器接合,风扇转速升高。空气温度越高,进油孔开度越大,风扇转速就越快。
2)当流经散热器的空气温度下降时,双金属感温器恢复原状,阀片关闭进油孔,在离心力的作用下,硅油经回油孔从工作腔返回储油腔,离合器分离,风扇转速变得很低。
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