降低活塞环外圆漏光度的对策

活塞环分气环和油环两种，其材料一般采用片状、粒状或球状石墨的珠光体铸铁。为提高活塞环的使用性能，对活塞环表面进行镇铬处理。镀铝油环（如图1所示）精度要求高，加工难度大，影响镀铬油环质量的主要因素是漏光度问题，本文在原工艺基础上，对原工艺、工装进行改进；分析     

活塞环漏光度制造质量控制的关键技术探讨

分析活塞环的制造方法,重点讨论漏光度检测的关键质量控制点,提出通过对活塞环漏光度进行在线检测实现质量预测控制的一些思路和方法.     

全数控异形活塞环车库检测系统的研制

提出了一种检测活塞环外圆表面的新方法－－在位测量,设计了软硬件系统,并集成了活塞环自由形线生成系统,使活塞环自由形线的生成和测试一体化,大大提高了活塞环的生产率,缩短了活塞环生产的周期。     

内燃机活塞环漏光度检测

一、概述活塞环是内燃机的重要基础件之一,同时又是用量很大的易损件。活塞环的“漏光度”作为一项重要质量指标直接影响整机的性能,因此世界各国对活塞环漏光度的控制日趋严格。据国内四大活塞环厂统计,年产活塞环总量达7000万片,每片均要通过漏光度检验方可出厂。当今国内外流行的漏光度检测操作要求在暗室中进行,用肉眼观测微小漏光束和估算活塞环圆周漏光弧段的分布和每个弧段对应中心的度数,然后对照 GB1149—82标准,判定其符合漏光度质量要求。据工厂调查通常要求每人每班检测4000     

内燃机活塞环漏光度检测

<正> 一、概述活塞环是内燃机的重要基础件之一,同时又是用量很大的易损件。活塞环的“漏光度”作为一项重要质量指标直接影响整机的性能,因此世界各国对活塞环漏光度的控制日趋严格。据国内四大活塞环厂统计,年产活塞环总量达7000万片,每片均要通过漏光度检验方可出厂。当今国内外流行的漏光度     

铝酸钠溶液在线检测系统的研制

介绍了溶液在线分析系统的测定原理和系统结构。对数学模型的修正作了详细讨论。程序运算得到的溶液浓度值与化验室分析值的相对误差不超过± 2 .5 % ,测量结果的精度能满足生产工艺的要求 ,对生产具有现实的指导意义     

细钢丝绳张力在线检测装置的研制

采用“三点弯曲法”测力原理,设计出了以单片机为控制核心的细钢丝绳张力在线检测装置。该装置可以夹持于钢丝绳的任何位置,测出本身运动或不运动的钢丝绳的静、动张力。     

基于光纤传感技术的液压油污染度在线检测

对液压油污染度进行监测是了解液压设备工况的重要方法之一.基于光散射原理,结合计算机数据处理技术,该文提出了利用光纤传感器技术监测油液污染度大小的设计方案,以检测液压油的污染状况,并进行了相关的实验影响因素分析,为该类仪器的设计和性能完善提供了一定依据.     

Elastohydrodynamic lubrication of piston rings

A non-linear finite-element scheme, based on the Newton-Raphson-Murty algorithm, was used to analyze the problems of piston rings according to theories of both elastohydrodynamic and hydrodynamic lubrication. The maximum film pressure and the minimum film thickness were obtained and depicted as functions of the crank angle. For hydrodynamic lubrication the results obtained were compared with those found using the method suggested by Dowson and Ruddy; there was good consistency between them. In this way the accuracy and reliability of the proposed method are demonstrated. Furthermore, the results evaluated using the theory of elastohydrodynamic lubrication give a larger minimum oil film thickness and a flatter pressure distribution than those evaluated using the theory of hydrodynamic lubrication.     

Initial sliding wear on piston rings in a radial piston hydraulic motor

The initial sliding wear of boundary lubricated piston rings used in a hydraulic motor is studied in terms of the changes in mass, form and surface roughness. The piston ring in a hydraulic motor makes an important contribution to high volumetric efficiency by properly sealing the cylinder bore and piston. The results show that the wear on the piston ring in this particular test rig takes place at the top of the asymmetric crowning at the outer surface contacting the cylinder bore. Initially, the roughness amplitude decreased rapidly, and had decreased by one-third after sliding 10 m. The dominant wear mechanism was mild wear. Abrasive wear also clearly influences the amount of wear.     

F-C201氢压机Ⅱ级活塞、活塞环的改造

将氢压机活塞、活塞环进行改造。活塞环由金属环改为复合型填充PTFE新材料，增加巴氏合金导向环，实际运行表明，运行周期增加数倍。     

Friction and wear processes in piston rings

It has been recognised that a large part of the top piston ring wear of an ic engine takes place in boundary lubrication around top dead centre (tdc) position. A quantitative assessment of the friction behaviour using actual piston ring and cylinder liner under conditions close to tdc has been made. The factors responsible for wear under these conditions have been identified as surface temperature, peak combustion pressure, total energy on the wearing surfaces and other physical properties of the material under sliding     

基于.Net技术的ZnO避雷器在线监测系统的研制

ZnO避雷器是电力系统中重要的过电压保护设备．对避雷器进行在线监测非常重要。本文通过分析避雷器在线监测中的问题和难点．提出了一种基于．net技术的避雷器在线监测系统．系统采用了.net技术．同步技术和新型传感器，极大地提高了监测数据的精度和稳定性，系统集现场监测和远程监测于一体，有着很广阔的应用前景。     

金属腐蚀在线监测系统的研制

基于电化学线性极化和弱极化测定方法，本文设计了一种金属腐蚀速率在线监测系统．成功地实现了金属腐蚀速率和极化电阻的自动在线监测和实时数据显示。对比实验表明．监测系统性能稳定．测量速度快、测量结果可信。     

On the hydrodynamic lubrication analysis of piston rings

A theoretical hydrodynamic lubrication analysis of piston rings is presented. A numerical scheme is developed to solve the Reynolds' equation and the load equilibrium equation simultaneously. The hydrodynamic effects are examined in detail by considering solutions to the problem of lubricating the top compression ring in a two-stroke diesel engine. The minimum film thickness is computed throughout a complete cycle. The pressure profiles and film shapes at different crankshaft angles are presented. In the method proposed, the camtation boundary condition within the lubricated conjunction is included in the analysis.     

Measuring radial pressure distributions of piston rings based on partial-thin-walled cylinder

The measurement of radial pressure distribution of piston rings is very important for minimizing the wastages of lubricating oils and hence the lower gas emissions; for improving the friction status to reduce the gasoline consumption and for the reasonable heat transfer efficiency for the desired accuracy levels. For accurate and efficient measurement of radial pressure distribution of piston rings, a new PC based prototype instrument based on a partial-thin-walled cylinder sensor is designed and developed. The present paper describes the details of the measurement principle, hardware and software of this instrument. The measurement results thus obtained using the proposed instrument during experiments performed on a conical ring of diameter 110 mm and a drum ring of diameter 120 mm, are quite accurate, consistent and repeatable within the desired level of accuracy.     

Frictional behavior of piston rings of small utility two-stroke engine under secondary motion of piston

The secondary motion of the piston head of a motorized engine is captured using two laser displacement sensors to obtain the piston motion and tilt angle. The controlled parameters of the measurement are engine speed, quantity of oil and oil-fuel mixture and its ratio. The reduction in friction force is more significant at dead center at high speed as the quantity of oil supplied increases. Changes in tilt direction of piston head occur at the inlet port. The relationship between the friction force and piston tilt angle showed weak correlation at low speed and increases with the engine speed.