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活塞用的铸造铝合金在强化工况下不能保证内燃机可靠地工作,因为工作温度高达300～350℃时,铝合金内迅速出现固溶体分解、硬化相聚集等过程,从而使合金的物理性能改变,强度降低。 为了延长柴油机的使用寿命,提高工作可靠性,增大其功率,活塞受热最大的部位,都以定向油流,通过制于活塞顶部、邻接燃烧室和第一道气环附近的不同形状的冷却腔来进行冷却。
The cast aluminum alloy for piston can not guarantee the reliable operation of the internal combustion engine under the enhanced working conditions. Because the working temperature is up to 300 ~ 350 ℃, the solid solution rapidly decomposes and the hardening phase accumulates in the aluminum alloy to change the physical properties of the alloy. Reduced strength. In order to extend the service life of diesel engines, improve work reliability and increase their power, the most heated parts of the piston are oriented oil flow through the cooling system of different shapes made in the top of the piston, adjacent to the combustion chamber and the first gas ring Cavity to cool.