离合器从动盘总成关键零件表面处理工艺

目前,汽车离合器从动盘总成产品中的从动盘、减振盘、盘毂、压紧片和垫片等关键金属零件的表面较多采用磷化生产工艺,工艺技术落后,产品外观不好看,不同批次零件表面色差大;工件尺寸受磷化时间影响,精度难以控制,质量不稳定,且磷化工艺使用的硫酸污染程度高;部分零件采用镀锌、镀铬、镀镍等电镀工艺,其价格昂贵,对环境的污染大,已不适应企业发展的需要。     

重型汽车离合器从动盘总成解决方案

正离合器是汽车传动系中的重要部件,主要由飞轮、盖总成、从动盘总成、分离轴承以及压紧机构和操纵机构组成。其中一个重要作用就是保证具有可靠的传扭能力,其从动盘总成为单片式。目前,商用车趋于大型化,发动机功率不断加大,但离合器允许加大尺寸的空间有限,给传扭能力的增加带来很大的局限性。因此,增加传扭能力,提高其使用寿命,解决传扭能力增加受离合器允许加大尺寸空间限制的业内技术难题,成为当前重型汽车离合器发展的趋势。本文通过结构优化和技术创新,提供一种离合器大转矩双片式从动盘总成,能够满足传递大转矩的要     

干式双离合变速器转矩传递建模与仿真

干式双离合自动变速器(Dry Dual Clutch Transmission,DDCT)的膜片弹簧和从动盘波形弹簧片对常开式离合器的转矩传递特性有着重要影响。在分析膜片弹簧结合性能和载荷特性的基础上,推导出了内、外膜片弹簧的载荷变形公式。通过离合器总成台架试验,得到了从动盘轴向压缩曲线。综合考虑了膜片弹簧的载荷变形特性和从动盘总成的轴向压缩特性,利用Matlab/Simulink工具箱建立了常开式膜片弹簧离合器转矩传递模型,进而仿真得到了离合器转矩与接合轴承位移的关系曲线。     

微机测控汽车离合器从动盘总成综合性能试验台

本文介绍了微机测控汽车离合器从动盘总成综合性能试验台测试原理和基本构成,阐述了其硬件系统和软件系统的组成和功能。实际运行表明：该试验台使用方便,运行稳定可靠,自动化程度高,测试效率和测试精度均满足要求,适用于汽车离合器从动盘总成生产线上的产品最终检验。     

离合器从动盘总成铆接模具改造

正汽车离合器是汽车传动系中的重要部件,其主要由飞轮、盖总成、从动盘总成、分离轴承、压紧机构及操纵机构组成。其中,从动盘总成作为汽车离合器的核心产品之一,对汽车工业的发展起着重要作用。在汽车零部件市场瞬息万变的今天,市场竞争很大程度上取决于质量、成本和时间的竞争。目前,业内的从动盘总成铆接模具,根据产品规格不同,每种规格产品所对应的模具不同。这种对应方式,需要有很多的模具数量才能满足生产     

离合器摩擦片应急更换

一台W4-60型挖掘机离合器片失效,需要更换.在野外更换离合器片时,可以不必将变速器和离合器总成吊下,只要使其与发动机分离出一定的间距就可以采用换件法更换从动盘总成.     

离合器从动盘微调装置设计与波形片弹性研究

波形片是汽车离合器从动盘总成中的重要弹性元件,基于客户对从动盘总成弹性的特殊要求,设计了一套波形片弯曲成形微调装置,便于实现快速制造;该调整装置主要由夹紧机构、调整机构以及弯曲成形机构组成。利用微调装置对波形片成形高度进行微调,对3种不同成形高度的波形片进行试装,分析了波形片大端成形高度对离合器从总成弹性的影响,实践验证了微调装置设计的合理性、可操作性与便捷性。     

汽车离合器从动盘拖曳分离测试机设计

汽车离合器从动盘拖曳分离测试机是汽车从动盘总成工件出厂检验的主要设备，是保证汽车从动盘总成产品质量考核的重要手段。通过深入研究国外同类产品，设计开发了测试机。采用四导杆的导引结构，使用伺服电机加载，电机采用滑模变结构控制，降低了超调量，提高了检测精度与检测效率。经使用，所设计制造的测试机工作可靠，满足了生产线大批量生产检验的需要。     

汽车离合器从动盘扭转耐久试验台架设计

从动盘是汽车离合器的关键零件,其扭转耐久性能对汽车动力传输的可靠性起着至关重要的作用。设计试验台架,按实车状态安装从动盘,通过角度扭矩传感器实时监控扭转角度和加载的扭矩,确保对从动盘扭转耐久性能的充分验证;采用摇杆机构对多个从动盘同时进行扭转耐久试验,提高了试验效率。     

汽车干摩擦式离合器台架试验方法摘登

１　主题内容与适用范围本标准规定了汽车干摩擦式离合器及其组成部件的台架试验方法。本标准适用于各类汽车干摩擦式离合器。２　引用标准ＱＣ／Ｔ２９０２５汽车干摩擦式离合器技术条件。ＱＣ／Ｔ２９０５２汽车离合器总成质量分等标准。３　术语及代号３．１　负荷特性在未装从动盘总成的条件下，对压盘加载和随后减载过程中，作用于压盘上的载荷Ｐ１与压盘位移λ１之间的关系曲线（见图１）。３．２　工作位置压盘移量λｂ离合器处于实际安装状态，压盘位置相对于未装从动盘总成时压盘位置的位移量。３．３　工作压紧力Ｐｂ在负荷特性减…     

Minimal Realization of Linear Graph Models for Multi-physics Systems

An engineering system may consist of several different types of components,belonging to such physical"domains"as mechanical,electrical,fluid,and thermal.It is t...     

INTEGRAL EQUATION METHOD＇S APPLICATION IN HOLE-EDGE STRESS OF COMPOSITE MATERIAL PLATE WITH DIFFERENT SHAPED HOLES

The strength of composite plate with different hole-shapes is always one of the most important but complicated issues in the application of the composite material. The holes will lead to mutations and discontinuity to the structure. So the hole-edge stress concentration is always a serious phenomenon. And the phenomenon makes the structure strength decrease very quickly to form dangerous weak points. Most partial damage begins from these weak points. According to the complex variable functions theory, the accurate boundary condition of composite plate with different hole-shapes is founded by conformal mapping method to settle the boundary condition problem of complex hole-shapes. Composite plate with commonly hole-shapes in engineering is studied by several complex variable stress fimction. The boundary integral equations are founded based on exact boundary conditions. Then the exact hole-edge stress analytic solution of composite plate with rectangle holes and wing manholes is resolved. Both of offset axis loadings and its influences on the stress concentration coefficient of the hole-edge are discussed. And comparisons of different loads along various offset axis on the hole-edge stress distribution of orthotropic plate with rectangle hole or wing manhole are made. It can be concluded that hole-edge with continuous variable curvatures might help to decrease the stress concentration coefficient; and smaller angle of outer load and fiber can decrease the stress peak value.     

Non-monotonic material contrast in scanning ion and scanning electron images

30 keV Ga⁺ focused ion beam induced secondary electron (iSE) imaging was used to determine the relative contrast between several materials. The iSE signal compared from C, Si, Al, Ti, Cr, Ni, Cu, Mo, Ag, and W metal layers does not decrease with an increase in target atomic number Z₂, and shows a non-monotonic relationship between contrast and Z₂. The non-monotonic relationship is attributed to periodic fluctuations of the stopping power and sputter yield inherent to the ion–solid interactions. In addition, material contrast from electron-induced secondary electron (eSE) and backscattered electron (BSE) images using scanning electron microscopy (SEM) also shows non-monotonic contrast as a function of Z₂, following the periodic behavior of the stopping power for electron–solid interactions. A comparison of the iSE and eSE results shows similar relative contrast between the metal layers, and not complementary contrast as conventionally understood. These similarities in the contrast behavior can be attributed to similarities in the periodic and non-monotonic function defined by incident particle–solid interaction theory.     

Application of Feature Extraction through Convolution Neural Networks and SVM Classifier for Robust Grading of Apples

This paper proposes a novel grading method of apples,in an automated grading device that uses convolutional neural networks to extract the size,color,texture,an...     

分布动态载荷识别的抗噪处理

针对正交多项式频域法在用多种响应对矩形薄板进行载荷识别中抗噪性较差的问题,综合运用平均法、矩阵预处理和奇异值截断法等方法对之进行改善,并引入空间映射的思想,将该方法的应用范围拓展为复杂的模型.利用仿真算例,证实了该方法具有较好的抗噪性.     

Short-Term Relay Quality Prediction Algorithm Based on Long and Short-Term Memory

The fraction defective of semi-finished products is predicted to optimize the process of relay production lines, by which production quality and productivity ar...     

End-to-End Multiview Gesture Recognition for Autonomous Car Parking System

The use of hand gestures can be the most intuitive human-machine interaction medium.The early approaches for hand gesture recognition used device-based methods....     

基于MELTAC-N平台的核电厂安全级DCS环网研究与测试

针对工程实践中环网通讯相关问题的处理缺乏理论基础及国产化安全级DCS平台的开发缺乏成熟经验借鉴问题,对基于MELTAC-N平台核电厂安全级DCS环网的软硬件实现进行了研究。提出了安全级DCS环网双环网冗余设计、光切换开关设计等硬件设计方法,以及以RPR协议为基础,采用全数据收发策略的软件设计方法。在CPR1000安全级DCS平台上对安全级DCS环网的可靠性及实时性进行了评价,并进行了容错能力、响应时间及响应时间稳定性测试验证实验。结果表明,基于MELTAC-N平台安全级DCS环网软硬件设计具有较好的容错能力及响应时间稳定性。     

The laboratory simulation of abrasive wear

Abrasive wear has long been recognised as one of the most potentially serious tribological problems facing the operators of many types of plant and machinery; several industrial surveys have indicated that wear by abrasion can be responsible for more than 50% of unscheduled machine and plant stoppages. Locating the operating point of a tribological contact in an appropriate operational ‚map’︁ can provide a useful guide to the likely nature and origins of the surface degradation experienced in use, though care must be exercised in choosing the most suitable parameters for the axes of the plot. Laboratory testing of materials and simulations of machine contacts are carried out for a number of purposes; at one level for the very practical aims of ranking candidate materials or surface hardening treatments in order of their wear resistance, or in an attempt to predict wear lives under field conditions. More fundamentally, tests may be aimed at elucidating the essential physical mechanisms of surface damage and loss, with the longer term aim of building an analytical and predictive model of the wear process itself. In many cases, component surface damage is brought about by the ingress of hard, particulate matter into machine bearing or sealing clearances. These may be running dry although, more usually, a lubricant or service fluid is present at the interface. A number of standardised wear test geometries and procedures have been established for both two- and three-body wear situations, and these are briefly described. Although abrasive wear is often modelled as following an ‚Archard’︁ equation (i.e. a linear increase in material loss with both load and time, and an inverse dependence on specimen hardness) both industrial experience and laboratory tests of particularly lubricated contacts show that this is not always the case: increasing the hardness differential in an abrasively contaminated lubricated pair may not always reduce the rate of damage to the harder surface.     

ANGULAR DISTORTION ALLOWABLE VALUE AND ASSESS METHOD OF WELD ON COKE TOWER

A graph as the new engineering method for estimate the safety of bulging deformation of coke tower is proposed. Through stresses analysis of circumferential weld of coke tower and comparing the stresses produced by pressure with heat stress of steady state, residual stress, bending stress produced by both itself weight and wind loads, it showed that the stresses produced by pressure on the angle distortion are the main factor of equivalent stress of the combined stress. After comparing four kinds of stress controlling conditions, the relation to stress with depth of angular distortion, grade of curvature of angular distortion and half of region of angular distortion has been inferred. Graph of deformation allowable value of coke tower for different condition by angular distortion and half of region of angular distortion has been plotted. The five steps for its engineering use have been explained. The lighter the grade of curvature is, the larger of bulge allowance, may be, and the bigger of depth of angular distortion may pose too. For the coke tower with a popular structure of Dg 5 400 mm×28 mm, the result by graph is nearly more than the result of two formulas formed by other research, the error is less than 7.0%. But, the graph can be easily applied to different size of angular distortion.