汽车四轮转向传动系统设计_【汽车专业毕业论文】【答辩通过】.doc

摘要 本文主要研究了 关键词 Abstract This paper mainly studies is the four-wheel steering transmission system the basic structure and working principle, and the four-wheel steering transmission routes are briefly analyzed. This theory, with a car related parameters of the four-wheel steering transmission system was designed. Including front wheel steering gear design calculation, rear wheel actuator design strength calculation, rack .Four-wheel steering transmission system is primarily through speed sensor, front wheel Angle sensor, front wheel speed sensor, steering wheel Angle sensor, rear Angle sensor, rear Lord Angle sensor, rear vice, rotational speed sensor sends a signal to the four-wheel steering controller inside, signal through processing, draw the rear required corner size and direction, control actuator finish turning. This system can improve vehicle speed steering flexibility and high speed control stability of, make cars in steering response quickly, steering capability is strong, run straight stability. Front wheel steering gear is the basic components, four-wheel steering motor hydraulically rack-and pinion steering gear Rear actuators are drive rear wheel steering the major components. Through the front wheel steering gear and rear actuator is designed for four-wheel steering technology integral design provides the basis. Key words Four-wheel steering gear rack of electric power steering gear, rear wheel actuators 目录 摘要 I Abstract II 目录 III 第一章 绪论 1 第二章 设计方案选择 7 2.1 各传感器位置确定 7 2.2 转向机构的设计要求 8 2.3 转向梯形设计 9 2.4 本章小结 10 第三章 齿轮齿条电动助力转向器设计计算 11 3.1 转向器的效率 11 3.2 转向器正效率η+ 11 3.3 转向器逆效率η- 12 3.4 传动比的变化特性 13 3.4.1力传动比与角传动比的关系 14 3.5 参数选择 16 3.5.1转向轮侧偏角计算 17 3.6 转向系载荷确定 18 3.7 转向器的主要元件设计 19 3.7.1选择齿轮齿条材料 19 3.7.2齿轮齿条基本参数 21 3.7.3转向横拉杆及其端部 22 3.7.4齿条调整 23 3.8 齿轮齿条转向器转向横拉杆的运动分析 24 3.9 齿轮齿条传动受力分析 25 3.10 弹簧的设计计算 29 3.11 齿轮轴轴承的校核 32 3.12 电机选择 33 3.12.1助力转矩的计算 33 3.12.2电动机参数的选择和计算 34 3.13 本章小结 34 第四章 后轮转向执行器设计计算 35 4.1 执行器结构设