An analysis of the wear features of worm gear tooth flanks

Worm reducers with a double enveloping toroidal surface are a new type of reducer with higher wear resistance and longer service life. A series of contact fatigue tests of worm pairs has been carried out on a microcomputer-controlled test stand of closed power flow type, using an incremental method of increasing the load. During the test, the worm tooth flank completed 2.2 × 10⁷ cycles, and the worm gear tooth flank 1.1 × 10⁶ cycles. Meanwhile, the state of the flank was duplicated by means of a chemical film. This paper discusses the whole process of the occurrence and development of surface cracks as well as the formation of fatigue peeling. It should provide a reliable basis for definition of the law of fatigue damage of the worm gear tooth flank.     

孔内键槽与齿有方位要求的量具设计

通过对零件结构及用途进行分析,设计了一套简单易操作的孔内键槽与齿有方位要求的量具。在生产实践中,进行划线、对刀、检验,效果良好。     

Detecting gear tooth fatigue cracks in advance of complete fracture

Some results from using vibration-based methods to detect gear tooth fatigue cracks are presented. An experimental test rig was used to fail a number of spur-gear specimens through bending fatigue. The gear tooth fatigue crack in each test was initiated through a small notch in the fillet area of a tooth on the gear. The primary purpose of these tests was to verify analytical predictions of fatigue crack propagation direction and rate as a function of gear rim thickness. The vibration signal from a total of three tests was monitored and recorded for gear fault detection research. The damage consisted of complete rim fracture on the two thin rim gears and single tooth fracture on the standard full rim test gear. Vibration-based fault detection methods were applied to the vibration signal both on-line and after the tests were completed. The objectives of this were to identify methods capable of detecting the fatigue crack, and determine how far in advance of total failure positive detection was given. Results showed that the fault detection methods failed to respond to the fatigue crack prior to complete rim fracture in the thin rim gear tests. In the standard full rim gear test all of the methods responded to the fatigue crack in advance of tooth fracture; however, only three of the methods responded to the fatigue crack in the early stages of crack propagation.     

圆形活齿行星传动中内齿圈应力的研究

首先介绍了圆形活齿行星传动的工作原理,其次对内齿圈与针齿之间的相互作用力进行了理论分析,通过对内齿圈与针齿的受力最大处进行有限元分析,校核了受力复杂的内齿圈的强度.     

减速齿轮传动中主动轮齿根弯曲疲劳的计算

传动齿轮强度理论认为,齿间滑动摩擦对齿轮齿根弯曲疲劳的影响可忽略不计。针对此说法,本文作者对带惰轮的起重减速齿轮传动中主动轮受国情况展开全面的分析研究,推导出包括齿间滑动摩擦力在内的,实际外载荷作用下的主动轮齿根弯曲疲劳应力计算公式。结果表明,齿间摩擦力对含惰轮的减速齿轮传动中主动轮齿根弯曲疲劳强度的影响不可忽视。     

双圆弧齿轮传动弯曲疲劳强度可靠性分析

运用机械零件可靠度的计算方法 ,对双圆弧齿轮弯曲疲劳强度的可靠性进行计算 ,并给出了一实际算例。     

曲齿锥齿轮的应用与发展

纵观曲齿锥齿轮的发展历史可以看出：其两种主要类型一弧齿和摆线齿，是由加工机床决定的。随着机械科学与其他学科的交叉，切削刀具与被加工齿轮之间的相对位置可以通过控制系统实现相当灵活的连续变动，曲齿锥齿轮的齿线和齿形应该将具有更大的选择范围。此外，应用计算机辅助技术可以充分挖掘传统加工机床潜在的强大的机械性能，使现有的廉价生产设备转变为高效、高可靠性、操作简便灵活的先进设备。     

基于CosmosWorks的起重机高速齿轮轴疲劳分析

起重机高速齿轮轴是起重机运行和起升机构的重要零件之一,运用CosmosWorks软件对起重机高速齿轮轴进行有限元和疲劳分析计算,得到齿轮轴应力应变的分布情况和疲劳寿命,为起重机的可靠性设计提供理论数据。     

A generating method for digital gear tooth surfaces

Based on the theories of digital conjugate surface and gear meshing, a generating method for digital gear tooth surfaces (DGTS) is demonstrated in this paper. The research focuses on the conjugate motion between the DGTS, represented by discrete points, and the cutter figuration determined by analytic function in the manufacture process. Conjugate points in the cutter section corresponding to the discrete points on the digital surface and conjugate movements are solved. Automated sequence arrangements of the generating movement parameters have been performed and the discrete generating movements are interpolated in a continuous conjugate motion along the order. Strategies of error analysis and error compensation are also discussed in this paper. Computer-simulated examples of the generating machining of involute DGTS and non-standard shaped DGTS, the parameters of machining motions and real tooth surfaces verify the developed method. The research develops a new idea for the machining of DGTS, which breaks the limitations of conventional approaches based on analytic surfaces. It is of important theoretical and practical value to manufacture digital surfaces. Our method is not only be applicable in generating machining of discrete DGTS and analytic gear tooth surfaces with complex geometric design, but also in contributing to the processing of discrete digital cam and other 3-D digital surfaces .     

摆动活齿泵的研制

介绍了活齿传动的结构类型以及摆动活齿泵的工作原理,分析了摆动活齿泵的结构特点,确定了摆动活齿泵的基本参数,设计并制作了摆动活齿泵样机,进行了初步的实验室试验。研究结果表明,活齿泵具有流量大、流量均匀性好、运行平稳、噪声低等特点。     

展成法大轮准双曲面齿轮点啮合齿面主动设计

为准双曲面齿轮传动点啮合齿面主动设计建立通用的技术平台对于方便点啮合齿面主动设计的实际应用和更加深入的锥齿轮技术研究都是一项重要的基础工作.基于三轴联动锥齿轮机床建立准双曲面齿轮展成法大轮齿面的通用数学模型.根据点啮合齿面主动设计的原理和方法,在大轮轴截面内描述空间齿面啮合的接触点迹线,推导得到了展成法大轮点啮合齿面主动设计所需要的具体计算公式.这些公式可用于不同展成型式的展成法大轮点啮合齿面主动设计.最后,给出了一个展成法大轮准双曲面齿轮传动点啮合齿面主动设计的算例.     

基于齿面寿命的齿轮参数优化设计

以齿面寿命为目标对齿轮传动进行了优化设计，该优化设计考虑了负荷大小，接触点几何形状、滑动速度、油膜厚度等因素的影响，优化设计能为提高齿面寿命提供有价值的齿轮参数组合。     

弧齿线圆柱齿轮齿面形成原理

弧齿线圆柱齿轮是一种新型齿轮,它具有齿面弯曲强度高、低噪声、更好的润滑性能、对轴线平行度误差适应性强、无轴向力等一系列优点。但由于该齿轮发展历史不长,在理论上还缺乏系统性的研究,这就给该齿轮的设计应用带来了困难。着重从弧齿线圆柱齿轮齿面的齿面形成原理及啮合特性方面对该齿轮进行了分析和研究,推导出被加工齿轮齿面方程,目的在于为该齿轮的设计提供必要的理论依据。     

传动齿轮轮齿断裂问题的分析及防护措施

传动齿轮轮齿断裂现象，在机械传动设备中是一种最为常见的齿轮损伤形式。分析造成轮齿断裂的原因，采取适当的防护措施，避免轮齿断裂的发生。     

中心齿轮齿形的圆弧替代及误差分析

以MATLAB6．1为平台,提出用圆弧齿形替代中心齿轮理论齿形的优化设计方法,并对由此产生的径向误差进行分析。     

渗碳硬齿面双圆弧齿轮超硬加工技术

为了拓展圆弧齿轮的应用范围 ,本文介绍了渗碳硬化双圆弧齿轮超硬加工技术。应用这项技术加工的硬齿面双圆弧齿轮 ,其承载能力与相同规格的硬齿面渐开线齿轮相当     

活齿端面谐波齿轮啮合副齿面修形

活齿端面谐波齿轮传动是一种新型的传动方式,可以应用于大传动比、大功率的减速器之中,因此具有广泛的应用前景。在分析活齿运动规律的基础上,对于啮合副的理论齿面提出了一种便于设计和加工的修形方法,推导出了齿面修形的原则,为活齿端面谐波齿轮传动的设计、制造和应用奠定了理论基础。     

摆动活齿传动的中心齿轮参数化设计

这里以Pro／ENGINEER2000i为平台，给出了摆动活齿传动的主要零件--中心齿轮的参数化设计，并对中心齿轮齿形曲线的顶切进行了分析。应用该设计程序，设计出一系列内、外中心齿轮。     

单点线啮合齿轮齿厚测量尺寸研究

渐开线齿轮的齿厚测量尺寸通过测量公法线长度控制。但单点线啮合齿轮中大齿轮为一个大负变位的齿轮,渐开线部分较短,公法线无法测量。当单点线啮合齿轮中大齿轮模数较大时,测量法线长度有困难。提出了两种大齿轮齿厚测量方法：测量法线长度或测量J点（渐开线齿廓曲线与过渡曲线之间的交点）法向齿厚与齿高,分别用于中小模数和大模数单点线啮合齿轮齿厚的控制。推导了测量尺寸计算公式,并通过实例进行了验证。     

机床调整参数误差对螺旋锥齿轮齿面形状误差影响的研究

通过齿面点离散的方法,评判机床调整参数误差对螺旋锥齿轮齿面误差的影响程度,进一步分析齿面形状变化趋势,指出了由于齿面误差引起啮合区位置偏移,从而导致的不良啮合状态,为机床误差补偿及提高螺旋锥齿轮的制造精度提供了依据.