汽车链滚子元件的高速多冲抗力研究

通过台架和道路行驶试验,利用扫描电镜微观分析了汽车链在正常服役条件下的失效形式。试验结果表明:汽车链传动中滚子元件的失效形式主要表现为冲击疲劳破坏,并伴有疲劳点蚀、磨粒磨损现象。根据试验结果,探讨了合理选择滚子零件的材料及热处理工艺、合理设计滚子的成形工艺和外廓形状等措施,以提高汽车链的抗多冲疲劳断裂和耐磨损的能力。     

链传动的摩擦学设计分析

通过对链传动摩擦、磨损和润滑现象及机理,以及链传动结构和传动理论的综合分析,得出了链条磨损的主要形式及形成机理,给出设计减磨降阻链条的方法和机械结构;并应用链传动的摩擦学原理分析了链传动在各种工况下的润滑原理,给出了合理润滑方法;得出了链传动摩擦学设计的基本原理和方法。     

汽车分动箱链传动安全匹配设计方法与试验研究

基于汽车分时驱动和全时驱动整车动力性能要求,研究了分动箱链传动的匹配计算,分析了分动箱在各种典型工况下,其分动箱链条所承受载荷的计算方法,并据此提出安全匹配设计方法。介绍了分动箱链传动的试验方法并分析了试验结果,列举了分动箱选择匹配设计实例。结果表明,汽车分动箱链条的匹配设计在满足汽车分动箱动力分配的前提条件下,可以充分保证链传动系统的疲劳性能和磨损性能,该方法对汽车领域四驱分动箱链传动系统的自主开发具有重要的指导意义。     

新齿滚子链传动设计及动态特性分析

针对链传动中链条及链边振动较大、链条铰链磨损等动态问题,设计一种新齿滚子链传动,建立滚子链及新齿滚子链啮合传动模型,并对链传动动态特性进行仿真分析,研究了链传动在不同转速下啮合冲击力、不均匀系数、摩擦力和链传动横向振动的变化规律。研究结果表明:随着转速的增加,链传动过程中的啮合冲击力、链波动均增加,不均匀系数、摩擦力均减小;在转速小于6000r/min时,链传动横向振动较小,当转速大于6000r/min时,链传动横向振动急剧增加;新齿滚子链传动比标准滚子链传动的啮合冲击力、摩擦力小,传动平稳性好。     

基于Matlab 的链传动寿命计算及仿真

根据摩擦学原理，对多从动轮链传动的磨损使用寿命进行了研究，结合Matlab软件编程运算，构建了滚子链磨损使用寿命的计算模块，给出了多从动轮滚子链传动磨损寿命的计算公式，并进行了仿真计算。在已知工况下，仿真系统可以准确求解各段链条的磨损使用寿命及链条总预期磨损使用寿命。     

基于RecurDyn的扶梯驱动链系统故障仿真分析

为了研究扶梯驱动链系统的动力学特性及链轮磨损和链条磨损对链传动性能的影响,以链传动运动学理论和多体动力学理论为基础,采用RecurDyn软件建立扶梯驱动链系统的仿真模型,设置空载和负载两种工况,添加磨损故障条件进行仿真分析,得出正常状态和磨损状态链传动特性的变化规律;分析结果表明,磨损后动载荷显著增大。该方法可为扶梯驱动链系统磨损机理研究及故障诊断提供一定参考。     

封闭功率流式链传动试验台的设计与研制

封闭功率流式链传动试验台的设计与研制杭州链条总厂（３１０００５）陈建康一、前言随着我国链条工业的发展，在链传动的设计、研究、试验等方面取得了很大的成绩。在链传动动态性能的探索方面亦取得了一些经验。对整链运转试验，不仅是评定链条产品性能的基本方法，而且...     

汽车分动器齿形链疲劳失效分析

通过汽车分动器齿形链传动总成台架试验,研究了汽车链的疲劳机理,分析了链板疲劳断口的微观形貌,及探讨了汽车链主要零件的塑性变形和循环硬化特性,结果表明,汽车链的疲劳主要与链板的尺寸一致性、热处理和冲裁表面质量有关,指出了提高汽车分动器齿形链疲劳可靠性的措施.     

远距离输送链传动载荷分析及其磨损伸长研究

磨损是链条损坏的主要因素。对远距离输送链的各链段静、动载荷进行计算,通过分析理论公式,得出链条节距磨损不仅影响静载荷值而且会产生附加动载荷,对链传动过程中的振动激励力有较大的影响。对此,在输送链的静载荷逐点分析模型和链条、链轮啮合模型的基础上,得出每链段的载荷理论计算式,确立载荷和链条节距伸长量之间的公式化关系。为了分析验证理论结果,应用动力学软件RecurDyn进行数值模拟,得出了链条和链轮的载荷分布曲线,说明了每链段的总张力是静载荷和相应比例动载荷之和,验证得出了合理预紧张力的施加可以有效地降低磨损伸长引起的振动。     

汽车链磨损特性试验研究

为提高国产汽车链条的性能,满足汽车产品轻量化的个性需求,研究了一种汽车链产品的磨损机制,并对其磨损表面形貌进行微观分析.结果表明,该汽车链的主要磨损形式是疲劳磨损.销轴和套筒零件均发生循环软化,滚子零件发生循环硬化.保证滚子零件具有足够的强度与塑性,并采取合理的成形工艺,是提高滚子零件多冲抗力的有效方法.     

汽车发动机零件磨损机理分析

零件磨损是造成汽车发动机故障产生的主要原因之一。为了提高汽车发动机的工作可靠性，本文重要探讨了汽车发动机的使用条件和零件的表面质量等因素对零件磨损影响的机理，分析了影响零件磨损的具体原因。     

EXPERIMENTAL STUDY ON HIGH-SPEED CHARACTERISTICS OF AUTOMOTIVE ENGINE OIL-PUMP CHAIN

The high-speed multi-cycle impact and speed, load fluctuant characteristics of a kind of narrow-width automotive engine oil-pump chain 06BN-1 are studied through engine assembly and road-drive tests to satisfy the light-weight demand of engine. The worn surface morphologies of rubbing area between pin, bush and roller are also analyzed based on scanning electron microscope. The results show that the main wear mechanism of automotive engine oil-pump chain is fatigue wear, and it's failure mechanism is the forming, extending and flaking of cracks on top layer of pin and bush. Pin and bush both occurred cycle-soften phenomenon, and roller occurred cycle-harden. Fretting wear is one of the most important "fall to pieces" failure causes of automotive chain. Ensuring sufficient strength and plasticity of roller, as well as adopting suitable shaping technology are the effective methods to increase its resistance to multi-cycle impact.     

WEAR FAILURE MECHANISM AND MULTI-IMPACT PROPERTY OF AUTOMOTIVE ENGINE CHAIN

0 INTRODUCTIONIn recent years, along with continuous developing of the su-per-speed chain drive technique, the new automotive engines havealready extensively adopted timing chain and oil-pump chain(below general named for automotive chain). The driving sp…     

Wear Mechanism of Cemented Carbide Tool in High Speed Milling of Stainless Steel

Adhesion of cutting tool and chip often occurs when machining stainless steels with cemented carbide tools. Wear mechanism of cemented carbide tool in high speed milling of stainless steel 0Cr13Ni4 Mo was studied in this work. Machining tests on high speed milling of 0Cr13Ni4 Mo with a cemented carbide tool are conducted. The cutting force and cutting temperature are measured. The wear pattern is recorded and analyzed by high?speed camera, scanning electron microscope(SEM) and energy dispersive X?ray spectroscopy(EDS). It is found that adhesive wear was the dominant wear pattern causing tool failure. The process and microcosmic mechanism of the tool's adhesive wear are analyzed and discussed based on the experimental results. It is shown that adhesive wear of the tool occurs due to the wear of coating, the a nity of elements Fe and Co, and the grinding of workpiece materials to the tool material. The process of adhesive wear includes both microcosmic elements di usion and macroscopic cyclic process of adhe?sion, tearing and fracture.     

轿车后轮轴承磨粒磨损失效特性与产生机理

通过对 2 0 0余套早期失效的轿车后轮轴承失效统计分析发现 ,磨粒磨损及烧伤是后轮轴承主要的失效形式 ,该失效形式占所有轴承失效率的 6 0 %。根据轿车后桥半轴的结构、后轮轴承装配状况、及轿车后轮的动力学特性 ,本文提出了轿车后轮发生磨粒磨损及烧伤损坏的失效模型 :(1)在惯性载荷作用下 ,轴承内圈与轴颈接触部位的切向蠕动形成粘着磨损颗粒 ;(2 )半轴轴端螺纹防松键槽侵入轴颈与轴承内孔配合段 ,导致键槽锐边在轴承内孔刮研 ,产生切削微屑 ;(3)蠕动及刮研作用产生的磨损颗粒进入轴承滚道表面 ,与滚动体形成三体磨粒磨损。(4)在制动鼓的维修过程中 ,磨损颗粒的异常侵入 ,同样会导致轴承发生磨粒磨损失效。本文提出 ,防止轿车后轮轴承发生早期磨粒磨损失效的有效途径是 :(1)尽量避免与轴承配合的轴颈圆柱表面受到结构或工艺性的损害。(2 )提高轴颈与轴承内孔表面的光洁度和配合精度 ,以降低蠕动造成的磨损颗粒大小和数量。(3)通过密封等防范措施 ,防止磨损颗粒的侵入。     

An automated laboratory lubricant test to simulate valve train wear

The need for a laboratory tool to screen the antiwear properties of potential additives has become more crucial as engine tests have become more expensive and lubricant requirements have become more stringent. A laboratory test has been developed using the Falex machine to simulate the valve train wear of an automobile engine. The test procedure was 3.5 h long and included two levels of applied load. This laboratory test was found to give reproducible wear and correlated with the Sequence III-C engine wear test. The labor-intensive part of the test was converted to computer control and data acquisition. This conversion improved both test control and productivity.     

基于滴油润滑的摩托车传动链磨损特性的研究

定期滴油润滑的摩托车传动链道路行驶试验结果表明,滚子链套筒与销轴零件的主要磨损机制是磨粒磨损,并伴随有疲劳磨损的特征;在磨粒磨损机制下,一定范围内,套筒与销轴零件的初始表面硬度较高,渗层深度和心部硬度匹配合理,渗层硬度梯度较小,较佳的渗层及心部组织,都有利于改善其磨损表面形貌状态和耐磨性.     

高速切削Inconel 718刀具磨损形态和机理分析

利用涂层硬质合金刀具对Inconel 718进行了高速干切削试验,采用扫描电子显微镜SEM和能量分散光谱EDS扫描,对不同切削参数下刀具的损坏形态和损坏机理进行了研究。分析结果表明刀具损坏形式主要有前刀面磨损、后刀面磨损、剥落和崩刃。刀具损坏机理主要是粘结磨损、磨粒磨损、氧化磨损和扩散磨损等。     

Performance and failure of high speed steel drills related to wear

Three high speed steel grades, representing low, medium and high contents of alloying elements, were investigated in a comparative drill performance test using two different work materials. The results are discussed with reference to the observed wear mechanisms. Since drill performance is usually expressed as number of holes to failure, relationships between gradual wear and final failure of the drills are emphasized.The performance tests resulted in chisel edge, crater, flank and margin wear. The corresponding wear mechanisms were studied with the aid of scanning electron and light optical microscopy. The most important mechanisms are (1) abrasive wear for drilling in a plain carbon steel and (2) adhesive wear for drilling in a quenched and tempered steel.