电动SUV转向系统设计(含CAD零件图装配图)(任务书,开题报告,外文翻译,论文说明书15000字,CAD图纸5张)
摘 要
电动助力转向系统将电动机，电子控制单元等加在机械结构上，动力转向系统的力矩由电动机提供。与传统的形式相比，EPS系统具有节约资源，助力性能优，安全性好等优点。EPS将逐步取代液压助力，是未来转向系统发展的方向。在结构上，电机提供的转向力矩，经过减速机构传到转向轴，再通过万向传动装置传到小齿轮轴，小齿轮带动齿条横向移动，经过传动机构传递到两侧的车轮，实现汽车的转向。电动助力转向系统是在汽车转向系统上应用新兴的电力电子技术和高水平的电机控制技术，符合现代技术的发展。解决能源危机和环境污染是汽车行业发展的大潮流，电动汽车这种新能源汽车迅速发展，其特点是没有内燃机，依靠蓄电池作为动力源，所以电动助力转向对于电动车是一个必须的选择。从电动助力的优点和汽车的发展来说，研究电动助力转向是具有重要意义的。电动助力转向核心的两部分是ECU和转向器。ECU根据传感器传来的信息，对电机提供的助力大小进行控制。转向器是将旋转运动转换为横向运动。所以根据自己所学的汽车设计，机械设计等知识，对转向器的齿轮轴和齿条进行设计是本论文的主要内容。
本论文研究了汽车转向系统的整个发展历程和国内外的发展现状，并对不同形式转向器进行对比分析。对电动助力转向系统和其机械部分的工作原理进行介绍。接下来根据现有的汽车参数对齿轮齿条部分进行设计，并建立相应的三维模型。最后用ANSYS对小齿轮轴进行应力应变仿真分析。本论文为今后的电动助力转向系统设计提供了一定的参考，为其发展提供方向。
关键词：EPS，齿轮齿条转向器,设计，ANSYS
ABSTRACT
Electric power steering system will be motor, electronic control unit, etc. added to the mechanical structure, the power steering system torque provided by the motor. Compared with the traditional form, EPS system has the advantages of saving resources, providing excellent performance and good security. EPS will gradually replace the hydraulic power, is the future direction of the development of the steering system.In the structure, the steering torque provided by the motor, through the deceleration mechanism to the steering shaft, and then through the universal transmission device to the pinion shaft, pinion to drive the rack lateral movement, through the transmission mechanism to the wheels on both sides, The Electric power steering system is the application of emerging power electronics technology and high level of motor control technology in automobile steering system, which conforms to the development of modern technology.To solve the energy crisis and environmental pollution is the development trend of the automotive industry, electric vehicles, the rapid development of new energy vehicles, which is characterized by no internal combustion engine, relying on the battery as a power source, so electric power steering for electric vehicles is a necessary choice. From the advantages of electric power and the development of the car, the study of electric power steering is of great significance. The two parts of the electric power steering core are the ECU and the diverter.The diverter is to convert the rotary motion into lateral motion. Therefore, according to their own design of the car design, mechanical design and other knowledge, the steering gear gear shaft and rack design is the main content of this paper.
This paper studies the whole development process of automobile steering system and the development status at home and abroad, and compares and analyzes different types of steering gears. The working principle of the electric power steering system and its mechanical part is introduced. Next, according to the existing car parameters of the rack and pinion parts of the design, and the establishment of the corresponding three-dimensional model. Finally, ANSYS is used to analyze the stress and strain of the pinion shaft. This paper provides some reference for the future design of electric power steering system, and provides the direction for its development.
Key words: EPS, gear rack steering gear, design, ANSYS
目 录
摘 要 3
ABSTRACT 4
第一章 绪论 1
1.1论文研究的意义和目的 1
1.2转向系统发展 1
1.2.1传统机械转向 1
1.2.2 液压助力式转向系统 1
1.2.3电液助力式转向系统 2
1.2.3.1 电控液压助力转向 2
1.2.3.2 电动液压助力转向系统 2
1.2.4 电动助力转向 3
1.2.5 主动转向系统 4
1.2.6四轮转向系统 4
1.2.7线控转向系统 4
1.3 EPS的优点（详细） 5
1.4转向器的结构 6
1.4.1齿轮齿条式 6
1.4.2循环球式转向器 6
1.4.3蜗杆曲柄销式 7
1.5国内外研究现状 7
1.6课题研究的主要内容 8
第2章 齿轮齿条机械结构的设计 9
2.1主要参数的确定 9
2.2齿轮轴结构分析及设计计算 10
2.3齿轮轴的强度校核 12
2.4 齿条强度校核 15
第3章助力电机电机的选择和计算 16
3.1永磁直流无刷电机的选定 16
3.1.1电机的种类 16
3.1.2转矩选择 16
3.2功率的选择 18
3.4额定电压的选择 18
3.5电动SUV的电机选择 18
第4章电动助力转向系统控制策略 20
4.1助力特性研究和选择 20
4.2控制模式介绍 23
第5章齿轮轴有限元分析 26
5.1 齿轮轴力学模型 26
5.2齿轮轴参数 27
总结与展望 28
6.1总结 28
6.2展望 29
参考文献 30
致 谢 32
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