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挖机活塞顶部的几种不同结构形状

日期:2022-08-24   来源:http://www.dybocheng.com
挖机活塞顶部的几种不同结构形状?这个问题您了解吗?实际上长臂挖掘机租赁商购买时大多采用平顶活塞,优点是制造简单,受热面积小。
What are the different structural shapes of the top of the excavator piston? Do you understand this question? In fact, the long arm excavator renters mostly use flat top pistons when purchasing, which has the advantages of simple manufacturing and small heating area.
大多数挖掘机机出租时的活塞顶部由于要形成特殊形状的燃烧室,其形状比较复杂,一般都制有各种各样的凹坑,凹坑是为了改善发动机的燃烧状况而设置的,使可燃混合气的形成更有利,燃烧过程更完善。
Because the piston top of most excavators is required to form a combustion chamber with a special shape when they are rented, its shape is relatively complex. Generally, there are various pits. The pits are set to improve the combustion condition of the engine, so that the formation of the fuel mixture is more favorable and the combustion process is more perfect.
有的柴油机为避免气门与活塞顶相碰撞,在顶部还制有浅的气门避碰凹坑。柴油机活塞所受的热负荷大(尤其是直接喷射式柴油机),往往会使活塞引起热疲劳,产生裂纹。因此,有的柴油机可从连杆小头上的喷油孔喷射机油,以冷却活塞顶内壁。
In order to avoid the collision between the valve and the piston crown, some diesel engines also have shallow valve anti-collision pits on the top. The piston of diesel engine is subjected to large thermal load (especially in direct injection diesel engine), which often causes thermal fatigue and cracks. Therefore, some diesel engines can inject oil from the injection hole on the small end of the connecting rod to cool the inner wall of the piston crown.
长臂挖掘机
也有的挖掘机出租时在机体里设有专门的喷油机构,也可起到同样的作用。活塞顶部因承受燃气压力所以一般比较厚;有的活塞顶内部还制有加强筋。
Some excavators are equipped with special fuel injection mechanism in the body when they are rented, which can also play the same role. The piston top is generally thick because it bears the gas pressure; Some piston tops are also provided with reinforcing ribs.
环槽部环槽部主要用于安装活塞环以防止燃油或燃气漏曲轴箱,并将活塞吸收的热量经活塞环传给气缸壁,与此同时阻止润滑油窜入燃烧室。活塞头部加工有数道安装活塞环的环槽,上面2~3道用于安装气环,下面1~2道是油环槽。油环槽的底部钻有许多径向小孔,以便油环从气缸壁上刮下多余的润滑油从小孔流回曲轴箱。
Ring groove part the ring groove part is mainly used to install the piston ring to prevent fuel or gas from leaking into the crankcase, transmit the heat absorbed by the piston to the cylinder wall through the piston ring, and prevent the lubricating oil from flowing into the combustion chamber. The piston head is processed with several ring grooves for installing the piston ring. The upper 2-3 grooves are used for installing the gas ring, and the lower 1-2 grooves are used for installing the oil ring. Many radial holes are drilled at the bottom of the oil ring groove so that the oil ring can scrape off the excess lubricating oil from the cylinder wall and flow back to the crankcase through the small holes.
以上就是有关挖机活塞顶部的几种不同结构形状这一问题的相关内容了,您对此有啥想咨询的问题,可关注我们网站http://www.dybocheng.com更好的咨询。
The above is related to several different structural shapes of the piston top of the excavator. If you have any questions about this, please follow our website http://www.dybocheng.com Better consultation.


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