英语翻译Engine constructionThe automobile engine is essentially a heat engine.The heat engines used in modern automobile are internal combustion engines.Each of this engine has a few main working parts; the auxiliary parts are necessary to hold t

英语翻译Engine constructionThe automobile engine is essentially a heat engine.The heat engines used in modern automobile are internal combustion engines.Each of this engine has a few main working parts; the auxiliary parts are necessary to hold t
英语翻译
Engine construction
The automobile engine is essentially a heat engine.The heat engines used in modern automobile are internal combustion engines.Each of this engine has a few main working parts; the auxiliary parts are necessary to hold the working parts together or to assist the main working parts in their performance.The main parts are:(a) the engine block; (b) the cylinder; (c) cylinder head,usually holding inlet and exhaust valves; (d)the piston; (e)the connecting rod; (f)the crankshaft; (g)the crankshaft or main and connecting-rod bearing; and (h)the fuel pump and fuel nozzle.
Cylinder block
The cylinder block is cast in one piece.Usually,this is the largest and the most complicated single liece of metal in the automobile.
The cylinder block is a complicated casting made of gray iron (cast iron) or aluminum.It contains the cylinders and the water jackets that surround them.To make the cylinder block,a sand form called a moldis made.Then molten metal is poured into the mold.When the metal has cooled,the sand mold is broken up and removed.This leaves the rough cylinder-block casting.The casting is then cleaned and machined to make the finished block.
Cylinder blocks for diesel engines are very similar to those for spark-ignition engines.The basic difference is that the diesel-engine cylinder block is heavier and stronger.This is because of the higher pressures developed in the diesel-engine cylinders.
Several engines have aluminum cylinder blocks.Aluminum is a relatively light metal,weighing much less than cast iron.Also,aluminum conducts heat more rapidly than cast iron.This means there is less chance for hot sports to develop.However,aluminum is to soft to use as cylinder-wall material.It wears too rapidly.Therefore,aluminum cylinder blocks must have cast-iron cylinder liners or be cast from an aluminum alloy that has silicon particles in it.
Some manufactures make an aluminum cylinder block that does not have cylinder liners,or sleeves.Instead,the aluminum is loaded with silicon particles.Silicon is a very hard material.After the cylinder-block is cast the cylinders are honed.Then they are treated with a chemical that etches eats away the surface aluminum.This leaves only the silicon particles exposed.The piston and rings slide on the silicon with minimum wear.
有的不太成句子啊~本人英语不好，能不能在细致点啊，

英语翻译Engine constructionThe automobile engine is essentially a heat engine.The heat engines used in modern automobile are internal combustion engines.Each of this engine has a few main working parts; the auxiliary parts are necessary to hold t
发动机建设
汽车发动机基本上是一个热机.该热机在现代汽车是国内内燃机.每年这个引擎有几个主要工作部件;辅助部件需要进行了工作部件一起,或协助主要工作部件,在他们的工作表现.主要内容是：（一）发动机缸体; （二）缸; （三）缸盖,通常持进排气阀门; （四）活塞; （五）连杆; （六）曲轴; （七）曲轴或主及连接杆轴承;以及（ h ）的燃油泵和燃油喷嘴.
缸体
该缸体铸造,是在一块.通常情况下,这是我国最大和最复杂的单一liece金属在汽车工业.
该缸体是一个复杂铸件的灰口铸铁（铸铁）或铝.它载气罐及水的护套环绕.使缸体,砂状称为moldis .然后熔融金属注入模具.当金属冷却,砂型被摧毁和拆除.这使得该粗缸块铸造.铸造,然后进行清洗加工,使成品块.
缸体柴油发动机非常相似,这些为火花点火引擎.基本不同的是,柴油发动机缸体是加重和壮大.这是因为较高的压力,发达国家在柴油发动机气缸.
几个引擎都采用铝合金缸体.铝是一种比较轻金属,重量大大低于铸铁.此外,铝进行热量的速度比铸铁.这意味着有机会较少,为炎热的体育发展.不过,铝是软用气缸壁材料.它穿着过于急剧的.因此,铝缸体必须有铸铁缸套或投下由铝合金具有硅粒子.
一些制成品,使铝制缸体没有缸套,或袖子.取而代之的是,铝是装有硅粒子.硅是一种十分艰苦的物质.后缸块铸樽磨练.那么,他们的待遇与化学品,研究人员吃远离表面铝.这使得只有硅粒子暴露出来.活塞及戒指幻灯片对硅与最低磨损