活塞销

It provides a scientific appraisal method for the judgement of grouping reasonableness of piston pin and piston hole .

提出了活塞销与活塞销孔配合的可靠度概念及计算方法，可以定量地反映出活塞销与活塞销孔配合达到设计要求的程度，为判断活塞销与活塞销孔分组是否合理提供了一个科学的评价方法。

Because of the connecting rod is one of dyadic engine of piston and main compression engine part, whose larger end hole and crank shaft link up , the small head hole links up by the wrist pin and the piston , whose effect is that the piston gas pressure is transmitted to the crank shaft , collect crank shaft gas in driving but setting a piston in motion to compress a cylinder.

因为液压是活塞式发动机和压缩机的主要零件之一，其大头孔与曲轴连接，小头孔通过活塞销与活塞连接，其作用是将活塞的气体压力传送给曲轴，又收曲轴驱动而带动活塞压缩汽缸中的气体。

Because of the connecting rod is one of dyadic engine of piston and main compression engine part, whose larger end hole and crank shaft link up , the small head hole links up by the wrist pin and the piston , whose effect is that the piston gas pressure is transmitted to the crank shaft , collect crank shaft gas in driving but setting a piston in motion to compress a cylinder. the intensity is high.

因为连杆是活塞式发动机和压缩机的主要零件之一，其大头孔与曲轴连接，小头孔通过活塞销与活塞连接，其作用是将活塞的气体压力传送给曲轴，又收曲轴驱动而带动活塞压缩汽缸中的气体。

The piston is attached to the top of a connecting rod by a pin,called a piston pin or wrist pin.the bottom of the connecting rod is attached to the crankshaft.the connecting rod transmits the up-and-down motion of the piston to the crankshaft,which changes it into rotary motion.the connecting rod is mounted on the crankshaft with large bearings called rod bearings.

这个活塞被一个叫活塞销或轴颈销的销子连接在连杆的上部。连杆的底部被连接在曲轴上。连杆把活塞的上下运动传递给曲轴转变成旋转运动。连杆通过一个大的叫做杆轴承的轴承（其实就是滑动轴承，分成两个半圆轴瓦）安装在曲轴上。

The connecting rod main part processes a surface being that head hole and both ends big or small are weak, more important faying face and bolt hole locating surface being the connecting rod body and cover treating /outside.

因为液压是活塞式发动机和压缩机的主要零件之一，其大头孔与曲轴连接，小头孔通过活塞销与活塞连接，其作用是将活塞的气体压力传送给曲轴，又收曲轴驱动而带动活塞压缩汽缸中的气体。

Because of the connecting rod is one of dyadic engine of piston and main compression engine part, whose larger end hole and crank shaft link up , the small head hole links up by the wrist pin and the piston , whose effect is that the piston gas pressure is transmitted to the crank shaft , collect crank shaft gas in driving but setting a piston in motion to compress a cylinder.

本文主要论述了液压设计。因为液压是活塞式发动机和压缩机的主要零件之一，其大头孔与曲轴连接，小头孔通过活塞销与活塞连接，其作用是将活塞的气体压力传送给曲轴，又收曲轴驱动而带动活塞压缩汽缸中的气体。

Because of the connecting rod is one of dyadic engine of piston and main compression engine part, whose larger end hole and crank shaft link up , the small head hole links up by the wrist pin and the piston , whose effect is that the piston gas pressure is transmitted to the crank shaft , collect crank shaft gas in driving but setting a piston in motion to compress a cylinder.

因为连杆是活塞式发动机和压缩机的主要零件之一，其大头孔与曲轴连接，小头孔通过活塞销与活塞连接，其作用是将活塞的气体压力传送给曲轴，又收曲轴驱动而带动活塞压缩汽缸中的气体。

Firstly, the piston pin boss bearing, the piston pin and the connecting rod small end bearings were taken as a whole system, and the fourth-order Runge-Kutta method was used to solve the rotation speed of the piston pin operating in hydrodynamic lubrication.

首先，将活塞销孔轴承与活塞销及连杆小头轴承作为一个系统，利用四阶的龙格库塔方法求解了活塞销在流体润滑状态下的转动速度。

According to the acoustic model of piston slap noise, how the parameters affect the piston slap noise at different rotate speed was discussed. And those parameters were piston clearance, piston pin offset, connect rod ratio, piston skirt stiffness, crank shaft offset, height of piston's gravity center, total length of piston skirt, vertical position of piston-pin axis and under part length of piston skirt.

借助建立的活塞拍击噪声理论声学模型，深入探讨了配缸间隙、活塞销偏移量、连杆比、活塞裙部刚度、曲轴轴线偏移量、活塞质心高度、活塞裙部总长度、活塞销轴线竖直方向位置和活塞裙部下段长度等主要影响参数在不同的转速下对活塞拍击噪声的影响规律，初步总结出活塞低拍击噪声设计和改进的基本规律。

Load increased on piston,unreasonable design of piston pin boss,unevenly distributed positive stress on pin hole,stress on inside upper area of pin hole much higher than that on outside,the quality problem in machining and assembly are main reasons of fracture of steel-topped aluminium-skirted piston skirt .

活塞承受的负荷不断提升，活塞销座设计不合理，销孔正应力分布不均匀，销孔内侧上方区域应力远高于外侧应力以及加工和装配中存在的质量问题是柴油机钢顶铝裙组合活塞裙部裂损的主要原因。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。