【作者】 姜楠；

【导师】 孙培岩；

【作者基本信息】 大连理工大学 ， 动力工程（专业学位）， 2014， 硕士

【摘要】 时代在进步,整个世界都在发生着翻天覆地变化,汽车作为一项重要的交通工具,不知不觉的成为生活的组成部分。21世纪以来,我国的汽车产业高速发展,汽车市场正处于增长期。加快发展和生产自主研发的自主品牌汽车,是解决人们生活需求和拉动内需的有效方法。发动机的核心部件曲柄连杆机构是实现工作循环和完成能量转换的主要运动部分。随着时代的发展,美国、德国、日本等汽车工业发达国家都向着开发绿色清洁环保型发动机和高性能发动机两大方向开展技术创新。曲柄连杆机构的技术创新大多在于材料的制作工艺方面,以满足发动机功率提高所带来的安全性和可靠性等问题。随着人们对环境以及可持续发展要求的不断提高,使用对环境友好的清洁汽车,减少对环境的污染,是当今社会对内燃机动力汽车的迫切需要。然而,材料的改变不能实现燃烧性能的改善,因此结构方面的创新就成为一种新思路。1999年,法国研制出一种新型气体发动机曲柄连杆机构,实现了曲轴与定点的配合,改变了活塞运行的曲线,使燃烧更加完全,从而提高燃烧效率。PRO/ENGINEER是在机械类三维造型软件中很典型的设计模拟软件,在发动机的设计中应用也最为广泛。软件中包含的三维造型和运动分析对于实现新型曲柄连杆机构的设计和验证有着很大的帮助。本文通过PRO/E仿真建模和解析解理论分析,设计了一种应用在发动机上的新型曲柄连杆机构。通过对其结构的重新设计规划,使该结构在工作中具有明显的定容燃烧过程,快速压缩过程和自由排气过程。首先,确定了需要实现的目标曲线,以及目标模型主、副曲轴旋转的角速度关系；再结合实际情况设定参数,确定了目标曲柄连杆机构的初步模型；其次,在PRO/E软件中通过对模型的建立和动态分析,生成活塞运行竖直位移与时间的关系曲线,并分析各参数对结果的影响并对机构进行优化,逐步实现目标曲线；最后,验证机构转化模型——平面闭链五杆双曲柄机构的存在条件,并用解析解验证模型建立和模拟结果的合理性。更多还原

【Abstract】 Era of progress, the whole world is undergoing tremendous changes. Automobile as an important means of transport, unknowingly become an integral part of life. Since the21st century, As China’s automobile industry’s rapid development and is in a growth phase, accelerating the development and production of independent research and the development of own-brand cars is an effective way to solve the people’s living needs and stimulating domestic demand. Crank linkage is a core component of the engine and the main part of the movement to achieve the completion of work cycles and energy conversion. Technical innovation of crank linkage mostly lies on aspects of the materials’production process to meet safety and reliability issues brought by engine power increased. With the increasing people’s demands on the environment and sustainable development, Using of environmentally friendly cleaning car to reduce environmental pollution has been urgently needed to internal combustion engine powered vehicles in today’s society. If considering from the aspects of structural innovation, the traditional crank connecting rod mechanism obviously can not meet the design requirements. However, improve the combustion performance by changing the material can not be achieved, the structural aspects of innovation become a new idea. In1999, the French developed a new gas engine connecting rod to achieve the crankshaft and sentinel mating structure, changed the operation curve of the piston to more complete combustion and improving combustion efficiency. PRO/ENGINEER is a typical software of design simulation in the mechanical3D modeling software and most widely used in engine design. The3D modeling and motion analysis included in it has a great help for the realization of the design and validation of new crank linkage.This article designs a new crank linkage applied on the engine with simulation and modeling by PRO/E and theoretical analysis and analytical solutions. So that the structure has obvious constant volume combustion process, fast compression process and freedom of exhaust process at work. First, determine a target curve to be achieved and the angular velocity relationship of primary and secondary crankshaft in the target model. Set the parameters with the actual situation and determine the initial model of the target crank linkage mechanism. In the PRO/E software, generate a vertical displacement piston running relationship with time curve, through the establishment of the model and dynamic analysis. Analyze the impact of various parameters on the results and optimize the mechanism. Then achieve the target curve progressively. Certificate the exist conditions of the structure’s transformation model-a plane close chain five pairs crank mechanism. Final, verify the rationality of model with analytical solutions and simulation results.更多还原