缸盖的下方和活塞顶部形成燃烧室。
The underside forms the combustion chamber with the top of the piston.
简单地讲，活塞环就是装在活塞顶部的凹槽里的薄，圆的金属。
In simplest terms, piston rings are thin, circular pieces of metal that fit into grooves in the tops of the pistons.
共晶铝硅合金活塞顶部直径有两次突然长大，而过共晶铝合金活塞仅有一次。
The crown diameter of eutectic al Si alloy piston has increased suddenly in twice, but the hyper eutectic al Si alloy piston only once.
活塞顶部可以做成平的、凹的、凸的或是能够促进涡流帮助燃烧的任何形状。
It may be flat, concave, and convex or any one of a great variety of shapes to promote turbulence or help control combustion.
压力的大幅度升高使得作用在活塞顶部的力足够大，从而迫使活塞一直延气缸下行。
This pressure rise is so great that a force is exerted upon the top of the piston that is sufficient to force the piston all the way down the cylinder.
而且气门头部容易被经过的高温气体烧蚀，活塞顶部也可能会碰到气门使发动机严重损坏。
Also the valve heads will be liable to be burnt by the passing hot gases, and there is the likelihood of the piston crown touching an open valve, which can seriously damage the engine.
活塞顶部的形状使进入气缸的可燃混合气向上运动，这样有助于扫气，引导燃烧过的废气向上运动并从排气口排出。
The top of the piston is shaped to give the incoming mixture an upward movement. This helps to sweep the Burned gases ahead and out through the exhaust port.
采用温度记忆螺钉法对桑塔纳汽车发动机活塞顶部与裙部温度进行了测定，分析了测试结果，并与有限元计算所得结果进行了比较。
The temperature of top and skirt of the piston of SANTANA engine is measured by using temperature memory screw, the results are analyzed, and agree with the calculated results of FEM.
这些活塞中有3个顶部烧坏了。
在地铁区间隧道顶部开孔，利用地铁列车运行产生的“活塞风”进行自然通风换气是一种可能的通风技术手段。
Natural ventilation that made use of piston wind induced by metro operation at the top opening of metro tunnel is a possible means of ventilation technology.
大多数活塞的顶部有3个活塞环槽。
进气冲程在活塞位与气缸顶部（进气门开启，排气门关闭）时开始，在活塞到达其行程的底部时结束。
The intake stroke starts with the pistonat the top of the cylinder (intake valve open and exhaust valve closed) and stops with the pistonat the bottom of its travel.
进气冲程在活塞位与气缸顶部（进气门开启，排气门关闭）时开始，在活塞到达其行程的底部时结束。
The intake stroke starts with the pistonat the top of the cylinder (intake valve open and exhaust valve closed) and stops with the pistonat the bottom of its travel.
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