共查询到20条相似文献，搜索用时 265 毫秒
1.
Due to low carrying capacity and short life of current ring reducer, we proposed a new planetary gearing with internal gear ring, which consisted of two stages. One was an involute planetary drive and the other was an N-type planetary drive with small teeth difference. The kinematic calculation was conducted based on the analysis of structural composition and working principle. Formulas of backlash calculation for the new planetary gearing were derived by using probabilistic theory and the analytical model was created at the same time. Then, main factors that affect the systematic backlash were introduced and the effects of manufacture error, misaligments and roller bearing parameters on the distribution of backlash were presented. The influence of gear backlash on systematic return difference was performed based on the backlash mathematic model proposed. The results show that the backlash is a little large, of which the backlash of bearing takes a greater part than two gearing stages. So we presented some practical methods to reduce the systematic backlash. 相似文献
2.
采用有限元分析方法对烟草包装机椭圆齿轮的静力学特性进行理论计算和研究,建立椭圆齿轮的有限元模型,通过有限元分析软件ANSYS Workbench对椭圆齿轮进行分析,得出椭圆齿轮各轮齿的应力分布,并对计算结果进行分析。该方法和所得结果为椭圆齿轮的优化设计提供了参考。 相似文献
3.
Translational torsional coupled model based nonlinear dynamic analysis of an NGW planetary gear train 总被引：1，自引：0，他引：1
This paper aims to investigate the nonlinear dynamic behaviors of an NGW planetary gear train with multi-clearances and manufacturing/assembling errors. For this purpose, an analytical translational ? torsional coupled dynamic model is developed considering the effects of time-varying stiffness, gear backlashes and component errors. Based on the proposed model, the nonlinear differential equations of motion are derived and solved iteratively by the Runge-Kutta method. An NGW planetary gear reducer with three planets is taken as an example to analyze the effects of nonlinear factors. The results indicate that the backlashes induce complicated nonlinear dynamic behaviors in the gear train. With the increment of the backlashes, the gear system has experienced periodic responses, quasi-periodic response and chaos responses in sequence. When the planetary gear system is in a chaotic motion state, the vibration amplitude increases sharply, causing severe vibration and noise. The present study provides a fundamental basis for design and parameter optimization of NGW planetary gear trains. 相似文献
4.
曹冬梅 《连云港职业技术学院学报》2007,20(2):10-13,19
从齿轮时变啮合刚度出发，建立了单级2K-H渐开线行星齿轮传动的集中质量参数型振动模型，以行星架作为参考坐标，将齿轮啮合的刚度近似成时变分段线性的弹簧刚度，采用模态叠加的原理，通过系统在刚度变化时的速度以及位移的连续性条件，在时域范围内模拟系统的振动过程。分析了不同齿数齿轮对啮合力的影响，最后得出：在2K-H渐开线行星齿轮传动中，若太阳轮与内齿圈均为行星轮个数的整数倍时，行星轮的均载效果好；太阳轮与内齿圈的齿数不为行星轮个数的整数倍时，行星轮之间出现偏载；系统有数个与初始刚度相关的稳定点的结论。 相似文献
5.
利用速度图解法绘制3个等速点的线速度矢量,以直观了解机构中各元件的转动状态,并总结了利用速度图解法分析辛普森式行星齿轮机构的原则;利用相似三角形原理计算各传动方案的传动比,通过对速度图解法与解析法传动比的比较分析,验证了该方法和过程的正确性. 相似文献
6.
以2K-H行星齿轮传动系统为研究对象,给出固有频率的计算结果。在此基础上,研究了该系统的频响特性试验,包括试验台的布置及其试验方案的设计;测得系统的频率响应函数和固有频率,并将试验结果与理论计算结果进行了对比分析。 相似文献
7.
鼓形齿联轴器啮合分析 总被引：1，自引：0，他引：1
易传云 《上海大学学报(英文版)》2005,9(6):527-533
This paper presents an analysis result of three-dimensional meshing of crown gear coupling （CGC） surfaces of crown gear and internal gear are established. The equation of internal gear surface is given. The equation of conjugate surface of crown gear is solved according to the principle of gearing, and that of non-conjugate crown gear is derived with crown curve of a circular arc. The meshing state of conjugate and non-conjugate surfaces is analyzed through computation of contact lines and points. It is concluded that the meshing of conjugate CGC is line-contact, there are several pairs of teeth engage simultaneously, and non-conjugate CGC has point-contact condition of meshing and only 2 pairs of teeth engage in theory. 相似文献
8.
9.
利用Proe/Engineer软件的参数化设计功能进行渐开线直齿圆柱齿轮进行了建模.通过ANSYS有限元软件对渐开线齿轮考虑加工刀痕进行齿根应力分析.结果表明,力加载在渐开线齿廓上不同位置对齿根应力应变影响是不同的,在齿顶处影响最大SMX1〉SMX2〉SMX3,即在齿顶处加载轮齿容易破坏.在同一位置加载不同大小的力时,载荷大时齿根应力应变大,更易破坏.在有刀痕存在时,刀痕处易产生应力集中,并影响齿根应力分布,特别是在齿廓上时更易破坏。 相似文献
10.
In this paper, a 3D finite element （FE） program ADINA was applied to analyzing a tunnel with 9 segment tings. The loads acting on these segment tings included the squeezing action of tail brush of shield machine under attitude deflection, the jacking forces, the grouting pressure and the soil pressure. The analyses focused on the rebar stress in two statuses： （1） normal construction status without shield machine squeezing; （2） squeezing action induced by shield machine under attitude deflection. The analyses indicated that the rebar stress was evidently affected by the construction loads. In different construction status, the rebar stress ranges from -80 MPa to 50 MPa, and the rebar is in elastic status. Even some cracks appear on segments, the stress of segment rebar is still at a low level. It is helpful to incorporate a certain quantity of steel fiber to improve the anti-crack and shock resistance performance. 相似文献
11.
以计算机图形学中的曲线、曲面形成为基础，分析了双圆弧弧齿锥齿轮的齿形网格模型、表面模型的形成过程，为进一步对其进行有限元分析，进行网格划分打下基础。 相似文献
12.
According to Hertz theory, the difference of contact stress for non-circular gears and equivalent gears is compared in the paper, a calculating method of contact stress for non-circular gears by using equivalent gears is researched, and computing formulas of power and rotation speed for equivalent gears are deduced. A numerical simulation of contact stress for non-circular gears has also been conducted based on the finite element method. By the comparison of fitting curves, the feasibility of using equivalent gears instead of non-circular gears to calculate the contact stress is testified. 相似文献
13.
Three-ring gear reducer , an internal gear planetarytransmission, claims many advantages , including largetransmission ratio, high loading capacity, and compactvolume[1].However ,there still exist some disadvantagesinits application.One is the unbalanced … 相似文献
14.
A dynamic finite element method combined with finite element mixed formula for contact problem is used to analyze the dynamic characteristics of gear system. Considering the stiffness excitation, error excitation and meshing shock excitation, the dynamic finite element model is established for the entire gear system which includes gears, shafts, bearings and gearbox housing. By the software of I-DEAS, the natural frequency, normal mode, dynamic time-domain response, frequency-domain response and one-third octave velocity grade structure borne noise of gear system are studied by the method of theoretical modal analysis and dynamic response analysis. The maximum values of vibration and structure borne noise are occurred at the mesh frequency of output grade gearing. 相似文献
15.
针对教学过程中渐开线齿廓的形成过程难教难学的问题,设计制造了齿轮范成加工教具。该教具采用滚齿加工蜡制齿轮,可实现渐开线直齿圆柱齿轮和变位齿轮的加工,可用于范成法加工齿轮的演示教学和学生实验。 相似文献
16.
涂杰 《武汉职业技术学院学报》2013,12(1):97-99
为了减小齿轮的齿根弯曲应力,提高齿轮的传动能力,本文根据非对称渐开线齿轮研究学者提出的齿廓方程构建思路进行了建模,并用NISAⅡ进行了齿轮应力变化的有限元分析。通过分析比较得出使用非对称渐开线齿轮可以提高齿轮的弯曲强度从而提高齿轮的传动能力。 相似文献
17.
This paper is aimed to propose an approach to predict the dynamic characteristics of ring-plate planetary indexing cam mechanism,
which is a novel type of indexing mechanism that employs internal planetary transmission structure. Firstly, the geometry
and structure of the mechanism are discussed and the kinematic practicability is simulated with virtual prototype design.
Then a 3D finite element model of the ring-plate planetary indexing cam mechanism is developed with the commercial software
of MATLAB and ANSYS. Through the finite element analysis, the natural frequencies and the corresponding mode shapes are predicted
in one motion cycle. On the basis of the virtual prototype design and finite element analysis, an experimental prototype is
made and tested to validate the prediction of the dynamic characteristics. The agreement between experimental results and
the finite element analysis testifies that the finite element model developed is applicable to the prediction of the dynamic
characteristics of this type of mechanism. 相似文献
18.
介绍了椭圆齿轮的特点,利用Ⅰ-DEAS的三维实体造型功能和特有的一些绘图命令,实现了椭圆齿轮的三维建模,并为进一步进行有限元分析和数控加工仿真提供了参考和指导。 相似文献
19.
通过应用VB语言编制程序,以计算绘图所需的齿轮范成参数实现刀具和齿坯的范成运动和刀具的切削运动,实现任意模数、任意齿数不同压力角及不同变位系数齿轮的动态切削仿真,克服了采用齿廓范成仪做实验时,参数不能改变的局限性,基本满足现代化教学要求. 相似文献
20.
图论在行星轮系传动比分析中的应用 总被引：1，自引：0，他引：1
针对行星轮系求传动比的传统方法,提出以图论为基础,用图画对行星齿轮系进行拓扑描述。通过拓扑图中基本回路建立基本回路方程,对各类行星轮系进行传动比分析。较传统方法更直观、方便。 相似文献