多齿差内啮合摆线泵设计与开发关键技术研究

发布时间：2018-02-16 02:06

本文关键词： 内啮合摆线泵型线优化有限元仿真齿形修正　出处：《大连理工大学》2012年硕士论文　论文类型：学位论文

【摘要】：齿轮泵作为机械传动装置的重要组成部分,在液压传动与控制技术等领域中得到了广泛应用。而内啮合摆线泵更是以其单位体积排量大、容积效率高、流量脉动小、整体结构紧凑等优点受到行业内的高度重视。因此深入研究内啮合摆线泵的型线设计、优化、仿真、制造等关键技术,对齿轮泵的发展与创新有着重要意义。本文以多齿差内啮合摆线泵为研究对象,从短副外摆线参数方程的分析入手,分别运用相对运动法和包络法推导了摆线轮齿廓曲线方程。在对内外转子基本参数和几何尺寸归纳总结的同时,讨论了齿廓几何参数的限制条件,并对齿轮泵的啮合特性及运动特性进行了深入分析,其中包括啮合角、重合度、啮合界限点、齿廓曲率半径以及相对滑动系数等。以单位体积排量最大为目标函数,选取重合度、啮合角和齿廓重迭干涉条件等齿轮泵的限制条件作为约束,以弧径系数、创成系数、齿顶圆半径系数和齿根圆半径系数作为设计变量,建立多齿差内啮合摆线泵型线优化模型,并运用MATLAB软件编制了相应的GUl人机交互窗口,使优化设计操作更加方便快捷。通过对优化前后齿轮泵流量特性的分析比较,验证了优化结果的合理性。运用有限元仿真的方法对优化后的齿轮泵模型进行CFD流体仿真及CFX流固耦合分析。流体仿真中运用动网格技术,在得到齿轮泵内流场分布情况的同时分析了不同流体速度、粘度下的流场变化规律。流固耦合主要通过模拟内部组件与流体的相互耦合作用,分析内外转子及其关键组件的应力、应变情况,以期为转子齿廓修形提供理论依据。对内外转子的精加工方法进行讨论,在选定磨削为精加工方法的同时,针对具体情况,分析了展成磨削与成型磨削的利弊,并给出了磨削砂轮的形状设计方案。论文的最后对内外转子的齿形修正做了一定研究,选定转角修正法为齿形修正方法,具体操作可根据难易程度,只对内外转子中的一个进行修正,以期改善齿轮泵的传动条件。本文对多齿差内啮合摆线泵的研究主要包括：摆线轮齿廓型线设计、内外转子基本参数的优化分析、齿轮泵性能比较、模型的有限元仿真分析、内外转子精加工方法及齿形修正研究。论文基本形成了一套较为系统的研究体系,能够为多齿差内啮合摆线泵的设计制造及进一步研究提供一定的理论依据。
[Abstract]:Gear pump, as an important part of mechanical transmission, has been widely used in hydraulic transmission and control technology, while the inner meshing cycloid pump has the advantages of large displacement per unit volume, high volumetric efficiency and low flow pulsation. The advantages of compact structure are attached great importance to in the industry, so it is very important for the development and innovation of gear pump to study the key technologies such as profile design, optimization, simulation, manufacture and so on. This paper takes the multi-tooth difference inner meshing cycloid pump as the research object, starting with the analysis of the cycloid parameter equation of the short pair. The equations of tooth profile curve of cycloid gear are derived by using relative motion method and envelope method respectively. The limiting conditions of tooth profile geometric parameters are discussed while the basic parameters and geometric dimensions of inner and outer rotors are summarized and summarized. The meshing and motion characteristics of the gear pump are analyzed, including the meshing angle, the degree of coincidence, the meshing boundary point, the curvature radius of tooth profile and the relative slip coefficient. The maximum displacement per unit volume is taken as the objective function, and the limiting conditions of gear pump, such as overlap degree, mesh angle and overlap interference condition of tooth profile, are chosen as constraints, and the arc diameter coefficient and generating coefficient are taken as constraints. As the design variables, the radius coefficient of tooth top circle and the radius coefficient of tooth root circle are used as design variables to establish the optimization model of multi-tooth difference inner meshing cycloid pump profile, and the corresponding GUl man-machine interactive window is compiled by using MATLAB software. Through the analysis and comparison of the flow characteristics of the gear pump before and after optimization, the rationality of the optimization results is verified. The CFD fluid simulation and CFX fluid-structure coupling analysis of the optimized gear pump model are carried out by using finite element simulation method. In the fluid simulation, the flow field distribution in the gear pump is obtained and the different fluid velocity is analyzed by using the dynamic grid technology. By simulating the interaction between internal components and fluid, the stress and strain of internal and external rotors and their key components are analyzed in order to provide a theoretical basis for the tooth profile modification of rotors. The finishing machining method of inner and outer rotors is discussed. While grinding is selected as finishing method, the advantages and disadvantages of generating grinding and forming grinding are analyzed in the light of specific conditions. The shape design of grinding wheel is also given. Finally, the tooth profile correction of internal and external rotor is studied, and the method of angle correction is selected as the tooth shape correction method, which can be operated according to the degree of difficulty and ease. Only one of the inner and outer rotors is modified in order to improve the transmission conditions of the gear pump. In this paper, the research of multi-tooth difference internal meshing cycloid pump mainly includes: cycloidal gear profile profile design, internal and external rotor basic parameters optimization analysis, gear pump performance comparison, finite element simulation analysis of the model. The paper has formed a systematic research system, which can provide certain theoretical basis for the design, manufacture and further research of multi-tooth difference internal meshing cycloid pump.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH38

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