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大排量摩托车轴瓦菜鸟全攻略

之前写过两次关于轴瓦的烂文但是现在想想可能会存在很多的不足及容易误导很多菜鸟的地方,但是不管怎么说、怎么写,我只是想把这一点点心得跟大家说出来进行交流、讨论。（文中转载了部分轴瓦专业知识,文中只谈见解不谈结果）
一、清楚的认识曲轴与瓦
A、曲轴（这是曲轴在曲轴磨床上的图片）
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它的位置在中缸活塞之下的上下曲轴箱中心,离合器边盖右边部位的中心就是曲轴的位置0 && image.height>0){if(image.width>=700){this.width=700;this.height=image.height*700/image.width;}}" onmousewheel="return imgzoom(this);" onmouseover="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.style.cursor='hand'; this.alt='Click here to open new window\nCTRL+Mouse wheel to zoom in/out';}" onclick="if(!this.resized) {return true;} else {window.open('http://www.fuguiyumoto.com/upload_file/20061224172428766.JPG');}" alt="" src="http://www.fuguiyumoto.com/upload_file/20061224172428766.JPG" onload="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.alt='Click here to open new window\nCTRL+Mouse wheel to zoom in/out';}" border=0>
曲轴承载大小瓦片的部位就叫轴径,大瓦部位的就是主轴径,小瓦部位的就是连杆或小瓦轴径,一曲一拐的部位顾名思义就是曲柄了（看{dy}图）,一个主轴颈、一个连杆轴颈和一个曲柄组成了一个曲拐,并列缸的曲轴的曲拐数目等于气缸数,V缸发动机曲轴的曲拐数等于气缸数的一半。
先看直列四缸发动机曲轴的曲拐：

图一就是直列缸摩托车曲轴的图片。它有四个曲拐,每个拐的中间就是连杆轴径,连杆轴径与连杆中间就有小瓦承载,连杆上面安装活塞。。。。。。

再看V缸发动机曲轴的曲拐（大魔鬼的）：0 && image.height>0){if(image.width>=700){this.width=700;this.height=image.height*700/image.width;}}" onmousewheel="return imgzoom(this);" onmouseover="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.style.cursor='hand'; this.alt='Click here to open new window\nCTRL+Mouse wheel to zoom in/out';}" onclick="if(!this.resized) {return true;} else {window.open('http://www.fuguiyumoto.com/upload_file/20061224172449750.jpg');}" alt="" src="http://www.fuguiyumoto.com/upload_file/20061224172449750.jpg" onload="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.alt='Click here to open new window\nCTRL+Mouse wheel to zoom in/out';}" border=0>
它有四个主轴径跟两个连杆轴径,连杆轴径就是带两个孔的部位。。。。。。

主轴颈就是曲轴的承托部分,通过主轴承支承在曲轴箱主轴承座中。所谓的主轴承座就是这个部位：0 && image.height>0){if(image.width>=700){this.width=700;this.height=image.height*700/image.width;}}" onmousewheel="return imgzoom(this);" onmouseover="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.style.cursor='hand'; this.alt='Click here to open new window\nCTRL+Mouse wheel to zoom in/out';}" onclick="if(!this.resized) {return true;} else {window.open('http://www.fuguiyumoto.com/upload_file/20061224172510326.JPG');}" alt="" src="http://www.fuguiyumoto.com/upload_file/20061224172510326.JPG" onload="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.alt='Click here to open new window\nCTRL+Mouse wheel to zoom in/out';}" border=0>


它的上面放了曲轴主轴径瓦片（即大瓦）这个是下箱体的,还有上箱体也是同样的结构,曲轴的上下箱体也是通过了相当严格xx的筛选之后才进行装配的。
下面这个就是上曲轴箱：
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曲轴的大瓦（即主轴承）就是放在曲轴箱主轴承座中的（仔细看这是已经放入大瓦的示意图了）0 && image.height>0){if(image.width>=700){this.width=700;this.height=image.height*700/image.width;}}" onmousewheel="return imgzoom(this);" onmouseover="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.style.cursor='hand'; this.alt='Click here to open new window\nCTRL+Mouse wheel to zoom in/out';}" onclick="if(!this.resized) {return true;} else {window.open('http://www.fuguiyumoto.com/upload_file/20061224172610597.JPG');}" alt="" src="http://www.fuguiyumoto.com/upload_file/20061224172610597.JPG" width=896 onload="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.alt='Click here to open new window\nCTRL+Mouse wheel to zoom in/out';}" border=0>
一般来说,日系的大排量摩托车的主轴承的数目与连杆轴承的数目比为：“6：4、5：4（直列四缸）或4：2（V型四缸）”这个简单的来说就是曲轴的支承方式。国产教材上说,曲轴的支承方式一般有两种一种是全支承曲轴,另一种是非全支承曲轴。

全支承曲轴：曲轴的主轴颈数比气缸数目多,即每一个连杆轴颈两边都有一个主轴颈。如六缸发动机全支承曲轴有七个主轴颈。四缸发动机全支承曲轴有五个主轴颈。（但是CBR系列的机器与YAMAHA大板鼓系列的机器曲轴支撑方式就是xx不一样,CBR系列的机器支撑是5道主支撑轴承,而YAMAHA FZR系列的机器支撑是6道主支撑轴承）这种曲轴的设计即是为了减轻了主轴承载荷,减小磨损。