齿轮跑合过程的表面形貌研究

本文通过齿轮副跑合的模拟试验，得出了齿轮副在跑合过程中表面形貌的变化规律。     

考虑ARMA风速模型半直驱风电行星齿轮传动系统动力学分析

针对半直驱风电行星齿轮系统的变速变载的特点,考虑风速变化引起的外部载荷激励,采用自回归-滑动平均(ARMA)方法建立模拟风速模型,在考虑时变啮合刚度、啮合阻尼等因素的基础上,采用集中参数法建立了行星齿轮传动系统平移-扭转耦合动力学模型。并采用四阶龙格-库塔法,求解1.5 MW半直驱风力发电行星齿轮传动系统的动态响应。     

基于Pro/E双圆弧圆柱齿轮的参数化设计

分析双圆弧圆柱齿轮的齿形结构并计算相关尺寸,先利用Pro/E软件的参数特征建模功能构建基本形体,再切出一个齿槽,最后阵列出其余齿槽,实现双圆弧齿轮的参数化三维设计。并通过修改相关参数的值创建同类的其他齿轮模型,提高了同类产品的设计效率。     

相交轴渐开线变厚齿轮几何设计与啮合特性分析

根据空间齿轮啮合原理,建立相交轴渐开线变厚齿轮传动工作节圆锥模型,确定工作节锥角、齿线倾斜角及两齿轮安装距。提出空间点接触到线接触的转变控制条件,实现相交轴齿轮副的近似线接触;推导齿轮变位系数对节圆锥左右两侧有效齿宽的影响;基于相交轴变厚齿轮副参数关系,分析设计参数对啮合主方向角(FPD角)和齿轮副重合度的影响;根据线接触控制条件完成齿轮副参数设计并采用有限元法进行啮合特性分析,结果表明,考虑线接触条件的节圆锥设计得到的相交轴齿轮副在加载情况下,啮合状态呈现明显的线接触且啮合区域达到整个区域的50%左右,试验验证了理论分析的正确性。     

数控插齿机驱动箱系统综合变形下齿轮承载能力分析

以某企业YK51160C数控插齿机驱动箱系统为对象,建立了包含扭转、弯曲和横向耦合振动的驱动箱系统力学模型,分析了驱动箱系统综合变形引起的齿轮啮合错位对齿轮齿面载荷分布情况的影响,采用Romax软件基于ISO6336-1～3:1996标准,在考虑系统变形引起齿轮啮合错位的情况下,对驱动箱系统中的圆柱齿轮进行齿轮承载能力分析。结果表明驱动箱系统中的圆柱齿轮的强度均满足要求,为YK51160C数控插齿机驱动箱系统的进一步分析、优化提供了参考。     

偏曲轴少齿差行星减速器箱体的有限元分析

以偏曲轴少齿差行星减速器为研究对象,介绍了它的结构和传动原理。采用Pro/E三维造型技术生成实体模型,完成了减速器的整机装配。将箱体模型导入到ANSYS软件中进行有限元静应力分析。结果表明:减速器箱体壁厚为20 mm时最大应力值为15.572 MPa,远小于材料的许用应力60 MPa,取厚度为10 mm仍然满足强度要求。对偏曲轴少齿差行星减速器结构的优化设计有指导作用。     

汽车中小模数齿轮冷滚轧技术研究

阐述了中小模数齿轮零件冷滚轧技术的工艺、模具、坯料和工装夹具的设计方法和要点。分析了汽车转向器转向齿轮零件的结构特点及采用冷滚轧成形工艺加工的技术要点;并设计出了转向齿轮的冷滚轧工艺和滚轧轮;进行了滚轧轮与工装的安装、调试和冷滚轧工艺的试验研究。滚轧出了符合用户要求的转向齿轮零件。     

渐开线椭圆齿轮造型设计与分析

针对椭圆齿轮设计繁复的现状,提出了渐开线椭圆齿轮造型设计与分析的新方法。即根据给定的传 动比函数的变化规律,选取该函数最合适的表达式,反求节曲线;利用瞬时曲率圆法,进行渐开线椭圆齿轮齿廓造 型;用一对椭圆齿轮相互啮合时的传动比进行对比分析,验证了此方法不但可行而且具有较高精度。     

Sources of time‐varying contact stress and misalignments in wind turbine planetary sets

Recent data shows that 90% of large wind turbines include a gearbox, and industry forecasts expect this figure to remain relatively stable. With global annual volumes (2009) of around 18,600 units, the quality, cost and performance of gearboxes is of paramount importance to the wind sector. The industry has been focusing some attention on gearbox reliability, as demonstrated by a growth in the number of specific seminars and collaborative programs on this topic. One aspect that needs to be brought to an industry‐wide forum is the understanding of the complexity of bearing design in the gearbox and the careful attention that needs to be paid to ensure a reliable gearbox design. This paper seeks to address this issue by clear demonstration of design issues using a model of the gearbox from the National Renewable Energy Lab's Gearbox Reliability Collaborative. Detailed models are presented with focus on determining the quality of the function of the planetary gear stages. Key design drivers are discussed such as the quality of alignment at the gears and bearings and the loads and stresses seen on these components. Under a design load case with a significant rotor off‐axis moment the stresses in the planet gears and bearings are investigated. It is shown how the misalignment of the planet pins varies with the rotation of the planetary set and how subsequently time‐varying contact stresses and load distributions occur in the planet gears and bearings. These factors strongly influence the fatigue life of the gearbox components as well as the level of vibration. Design tools are then used to demonstrate how small variations in the clearances of the planet carrier bearings can have a big effect on the quality of the design. Numerical studies show where optimal clearance settings lie and how the misalignment of the planetary set can be improved. Furthermore, a demonstration is made of how redesign of the bearing arrangement and subsequent optimization of the planet tooth geometry further improves the misalignment and results in significantly reduced time‐varying contact stresses, better load distribution and reduced vibration. It is illustrated that small clearances, such as in the carrier bearings, can have a large effect on the performance of the design and a study shows how to identify and reduce time‐varying misalignment and contact stresses resulting in lower vibration, lower fatigue and a more reliable product. Copyright © 2011 John Wiley & Sons, Ltd.     

一种傅里叶非圆齿轮驱动的横封机构设计

目的设计一种符合块状包装物横封要求的横封机构,以更好满足横封的工艺要求。方法在分析块状物体横封工艺过程基础上建立傅里叶非圆齿轮数学模型,根据工艺要求建立目标函数以及横封机构参数优化模型,并通过实例进行验证。结果通过实例计算可知,优化设计得到的傅里叶非圆齿轮能更好满足设计要求,比原有传统偏心圆具有更高的灵活性。结论采用更加灵活的傅里叶非圆齿轮副驱动横封机构对横封机构参数进行优化设计,能够更好地满足块状物体横封工艺要求。