引擎机械 ENGINE MECHANICAL
引擎机械 ENGINE MECHANICAL(中文7300字,英文5100字)
操作引擎的主要成分和分类
汽车引擎根本上的热机动性是内燃机。
操作原理
火花点火发动机是一种燃料在外部燃烧的内燃机，汽油发动机就是一种火花点火发动机，四冲程汽油发动机的一个工作循环，活塞运动四个行程冲程。
第一个冲程在你的引擎称进气冲程。在活塞下行之后， 进气门不止是已经打开，而是随着活塞下移，开度还在进一步增大。这在活塞移动下来的整个时间允许可燃混合气进入。
记住，进气冲程在活塞位于气缸的顶部（进气阀开启，排气门关闭）时开始，在活塞达到其行程的底部时结束。这要求曲轴转过半周。
当曲轴继续移动，带动活塞通过气缸，如果保持两个阀门关闭，燃料混合物将被紧压或者被压缩，活塞达到气缸上止点，这称压缩冲程，他，同样，要求曲轴的一个半周。
压缩冲程思维将燃料喂更小的微量而服务的。这发生于突然膨胀和搅动压缩混合物。
当混合气被压缩，它的温度上升。温度的增量使混合物更容易点燃并且使它爆炸产生更加巨大的力量。当活塞在压缩冲程到达它的上止点时，经过爆炸被推回到适当的位置。 [资料来源：Doc163.com]
记住，压缩冲程从活塞在气缸（两个阀门被关闭）下止点时开始终止于活塞在气缸的上止点。这要求曲轴再次转过半周。
因为活塞到达压缩冲程的上止点，混合气被打破成微粒子并且被加热。当点燃时，它将爆炸产生巨大的力量，这是正确时间点燃混合气。火花塞在燃烧箱里面提供火花，火花产生的触点由内燃机发火装置形成。
ENGINE MECHANICAL
Operation Main Components and Classification of the Engine
The automotive engine is essentially a heat mobiles are internal combustion engines.
Princiole of Operation
The spark-ignition engine is an internal-combustion engine with externally supplied in ignition .The gasoline engine is a kind of spark-ignition engines.
The four-stroke-cycle gasoline engine cycle is spread over four pistion strokes.
The first stroke in your engine is called the intake stroke. Instead of opening the intake valve after you have drawn the poston down . you will find it better to open the intake valve as the piston starts down . This allows the air to draw fuel in the entire time the piston is moving down.
Remember , the intake stroke starts with the piston at the top of the cylinder(intake valve open and exhaust valve closed)and stops with the piston at the bottom of its travel . This requires one half turn of the crankshaft.
As the crankshaft continues to move , the piston is forced up through the cylinder . If you keep both valves closed , the fuel mixture will be squeezed , or compressed , as the piston reaches the top .This is called the compression stroke . It , too , requires a half turn of the crankshaft .
The compression stroke serves to break up the fule into even smaller particles . This happens due to the the sudden swelling and churning of the mixture as it is compressed .
When the air fule mixture is subjected to a sudden sharp compression force . its temperature rises .This increase in temperature makes the mixture easier to ignite and causes it to explode with greater force , As the piston reaches the top of its travel on the compression sroke , it has returned to the pro[er position to be pushed back down by the explosion.
[资料来源：www.doc163.com]