基于热固耦合的齿轮轴轴肩微动磨损机理研究

发布时间：2018-01-12 14:05

本文关键词：基于热固耦合的齿轮轴轴肩微动磨损机理研究　出处：《湖南大学》2013年硕士论文　论文类型：学位论文

【摘要】：微动是发生在接触表面之间振幅很小的往复运动,而微动磨损是工程实际中接触表面产生微动而出现的损伤形式。微动磨损可能造成机构配合性能改变,降低机器的工作可靠性和寿命,甚至引发严重的工程事故。由于表面磨损和表面微裂纹的诱发和扩展在现代高科技领域引起的破坏逐渐增加,因此研究微动磨损产生的机理,确定微动磨损的影响因素并采取相应的改进措施有着非常重要的现实意义。为此,本文以校企合作项目为依托,运用有限元分析软件ABAQUS对发动机动力总成齿轮轴轴肩与圆锥滚子轴承内圈接触面出现的微动磨损破坏现象进行了研究,主要工作与创新之处如下： (1)确定了轴肩微动磨损的影响因素,建立了齿轮轴机构的有限元模型和数学模型,为齿轮轴的热固耦合分析奠定了有力的研究基础。 (2)研究分析了轴肩处热量的来源,建立了锥齿轮和圆锥滚子轴承的几何模型和有限元模型,得出了齿轮温度、轴承温度和轴肩处温度随转速变化的规律。 (3)用热固耦合的方法确定减速器轴肩所受热应力,并分析微动磨损和温度的关系,通过氧化磨损公式计算齿轮轴轴肩的微动磨损量,从而说明温度是引起微动破坏的重要因素。
[Abstract]:Fretting is a reciprocating movement with small amplitude between contact surfaces, and fretting wear is the damage form of fretting the contact surface in engineering practice. Fretting wear may change the coordination performance of the mechanism. Reducing the working reliability and life of the machine, and even causing serious engineering accidents, the damage caused by the surface wear and micro-cracks in the field of modern high technology is increasing gradually. Therefore, it is of great practical significance to study the mechanism of fretting wear, determine the influencing factors of fretting wear and take corresponding improvement measures. Therefore, this paper relies on the cooperation project of school and enterprise. Using the finite element analysis software ABAQUS, the fretting wear failure phenomenon of the contact surface between the shaft shoulder of the engine powertrain gear shaft shoulder and the inner ring of the cone roller bearing is studied. The main work and innovation are as follows:. 1) the factors influencing the fretting wear of the shaft shoulder are determined, and the finite element model and mathematical model of the gear shaft mechanism are established, which lays a strong research foundation for the thermal-solid coupling analysis of the gear shaft. 2) the source of heat at the shaft shoulder is analyzed, the geometric model and finite element model of bevel gear and bevel roller bearing are established, and the gear temperature is obtained. The relationship between bearing temperature and shaft shoulder temperature with rotating speed. The thermal-solid coupling method is used to determine the thermal stress on the shaft shoulder of the reducer, and the relationship between fretting wear and temperature is analyzed, and the fretting wear quantity of gear shaft shoulder is calculated by oxidizing wear formula. It shows that temperature is an important factor of fretting failure.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TH132.41;TH117.1

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