汽车发动机链条高速性能的试验研究

汽车发动机链条的高速多冲特性以及速度与载荷的交变特性,是影响其耐磨性能和多冲抗力的关键因素。汽车发动机链条的主要磨损机制是销轴、套筒零件表层的裂纹生成、扩展与剥落,其磨损曲线的变化规律不同于中低速传动滚子链。保证滚子零件具有足够的强度与塑性,并采用合理的成形工艺,是提高滚子零件多冲抗力的有效方法。     

交变高速重载工况下滚子链磨损伸长量计算方法研究

滚子链磨损伸长量过大是造成滚子链传动失效的主要原因,考虑交变高速重载工况下滚子链的磨损伸长量的产生由三部分组成:套筒表面的疲劳磨损量、销轴表面的黏着磨损量和滚子链链板的塑性变形量,通过磨损的剥层理论、黏着磨损理论和低应力多冲碰撞宏观累积塑性变形理论,综合考虑载荷、速度、材料属性、表面加工系数、润滑状态等影响因素,建立了滚子链磨损伸长量计算模型,并以汽车用典型滚子链06B-1为研究对象进行磨损伸长量的计算。     

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。     

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.     

汽车发动机滚子链的疲劳可靠性试验研究

根据ISO15654-2004（传动用精密滚子链疲劳试验方法）中规定的链传动疲劳试验规范,分别利用成组法和升降法对汽车发动机机油泵滚子链06BT-1进行了疲劳可靠性试验,研究了高速汽车链的疲劳寿命分布规律,建立了与不同可靠度相对应的疲劳寿命和载荷水平之间的关系曲线。通过试验结果的对比分析,探讨了成组法和升降法的“谐应”关系,提出了实用的高速汽车链的疲劳试验方法。     

目前国产滚子链质量水平及存在的质量问题

本文通过对滚子链用户调访、滚子链产品的质量检测及现场工艺考察，综合分析了目前国产滚子链的质量水平以及存在的质量问题，对指导目前滚子链生产、提高国产滚子链质量水平可靠性具有重要的意义。     

基于RecurDyn的精密滚子链传动的运动特性仿真分析

滚子链是一种用于传送机械动力链条,广泛应用于工业和农业机械。以08B型短节距精密滚子链的例,分析了常用滚子链的传动方式,并分别对链传动的运动特性、动载荷、传动效率等进行了仿真分析,仿真结果验证了链传动的基本特性,预测了其动载荷的大小及传动效率,与理论分析结果一致。该方法为工程中选择和应用链传动提供了依据,为选择其他滚子链的设计和选型提供了依据。     

汽车主锥总成装配预紧力控制方法

根据汽车主锥总成对圆锥滚子轴承预紧力的控制要求,分析了装配尺寸链的动态特性,建立了基于动态尺寸链的预紧力控制方法.     

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.     

工程用钢制套筒链的疲劳与磨损特性

工程用钢制套筒链的疲劳与磨损特性吉林工业大学链传动研究所孟繁忠金昌黄梅１．结构特性工程用钢制套筒链作为传动与输送用的重要机械基础件，适用于斗式提升机等物料输送机，特别是在提升和输送颗粒或粉尘物料的工况下，更具有优越性。普通滚子链工作时，物料颗粒和粉尘...     

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…     

汽车发动机链条的微动磨损现象研究

通过对汽车发动机链条进行高速磨损试验和道路行驶试验,研究了汽车发动机链条的摩擦磨损性能。结果表明,试验后链条的套筒与内链板以及销轴与外链板之间的压出力和扭矩均有所下降,这就说明了微动磨损现象的存在。通过对磨斑形貌的分析,探讨了其磨损机制,表明粘着磨损、疲劳磨损和磨粒磨损是主要磨损机制。对汽车发动机链条微动损伤防护方法进行了探讨,表明通过对链板孔采用挤孔工艺,增加套筒与内链板,销轴与外链板的过盈配合量以及改进链板、销轴和套筒的表面处理工艺来提高其疲劳强度,可增加抗微动损伤的能力。     

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.     

新型Hy-Vo齿形链磨损特性的研究

通过分析计算以及300h的台架磨损试验,研究了新型Hy-Vo齿形链的耐磨特性,结果表明,由于新型Hy-Vo齿形链的一对对滚异型销轴以滚动摩擦为主交替承载磨损,其承载表面比压值较普通滚子链以及圆销式齿形链低,新型Hy-Vo齿形链具有较高的耐磨性。对新型Hy-Vo齿形链的异型销轴、内-外复合啮合链板以及外啮合链板的磨损表面作了SEM形貌分析。销轴的磨损机制为疲劳磨损,工作链板的磨损机制为磨粒磨损和疲劳磨损。     

Design and Analysis of the Gemini Chain System in Dual Clutch Transmission of Automobile

Chain drive system is widely used in the conditions of high-speed, overload, variable speed and load. Many studies are focused on the meshing theory and wear characteristics of chain drive system, but system design, analysis, and noise characteristics of the chain drive system are weak. System design and noise characteristic are studied for a new type Gemini chain of dual-clutch automatic transmission. Based on the meshing theory of silent chain, the design parameters of the Gemini chain system are calculated and the mathematical models and dynamic analysis models of the Gemini chain system are established. Dynamic characteristics of the Gemini chain system is simulated and the contact force of plate and pin, plate and sprockets, the chain tension forces, the transmission error and the stress of plates and pins are analyzed. According to the simulation results of the Gemini chain system, the noise experiment about system is carried out. The noise values are tested at different speed and load and spectral characteristics are analyzed. The results of simulation and experimental show that the contact forces of plate and pin, plate and sprockets are smaller than the allowable stress values, the chain tension force is less than ultimate tension and transmission error is limited in 1.2%. The noise values can meet the requirements of industrial design, and it is proved that the design and analysis method of the Gemini chain system is scientific and feasible. The design and test system is built from analysis to test of Gemini chain system. This research presented will provide a corresponding theoretical guidance for the design and dynamic characteristics and noise characteristics of chain drive system.     

表面强化销轴农用滚子链的磨损试验研究

对农机用滚子链条的主要磨损表面——销轴表面进行化学镀镍、镀硬铬、渗钒不同的表面强化处理,测量了三种销轴表面强化后及国外某公司同规格销轴的表面硬度及硬化层厚度.把三种销轴表面强化的链段与国外同节数的链段组装成一条链条,在LS910A封闭力流试验机上进行对比磨损试验.试验数据表明,在所提供的试验条件下,销轴表面镀硬铬链条具有更好的耐磨性能,优于国外的样品链条.     

Wear of Unlubricated Steel Surfaces in Sliding Contact

Observations have been made of the wear from an SAE 1113 steel pin specimen rubbing on a SAE 113 steel disk in a normal laboratory atmosphere in relation to normal load (0.5–10.4 lbf), slidinq speed (21–188 ft/sec), sliding distance and track history. As a function of sliding distance, three regions are observed; (i) initial severe wear, (ii) mild wear resultinq from the formation of oxide layers on both the pin specimen and transferred particles adhering to the track, (iii) a milder wear, due to the attainment of a uniform track condition. The wear rate measured in (ii) is observed to be proportional to normal load for constant (normal load)^1/2 × (sliding speed) provided that the magnitude of this parameter is insufficient to cause periodic removal of the surface film. This conclusion is shown to be compatible with earlier theoretical predictions when the presence of an oxide layer was pre-supposed. Unlike the coefficient of friction which is primarily determined by the pin surface condition only, the pin wear rate depends on the conditions of both the pin and track surface.