DFL4180牵引车转向系统设计(含CATIA三维图)

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DFL4180牵引车转向系统设计(含CATIA三维图)(任务书,开题报告,外文翻译,论文说明书10800字,PDF图,CATIA三维图)
摘要
汽车用于载客、运货,人们总是要求它绝对安全,因此自从汽车问世百年来,安全性一直是研究、设计、制造者关心的首要问题。现代汽车由于高效、节能发展的总趋势,使设计车速越来越高,加之已经数字庞大的保有量仍在不断增加,因而提高汽车的安全性,尤其是主动安全性几乎成了所有汽车生产厂家不倦研究的课题。汽车转向系是汽车操纵系统的一支主体,其与汽车操纵稳定性密切相关,因而它们的设计水平、制造质量、可靠程度是汽车主动安全性的重要依托。
本文所选车型属于重型货车,选用与之相匹配的整体式两轮转向系统。利用相关汽车设计和运动学知识,首先对汽车总体参数进行选择,在此基础上,对转向器、转向传动机构、转向助力系统进行方案确定,接着对转向器、转向传动机构、转向助力系统进行设计,并且利用CATIA软件对系统进行运动校核。最后,使用AutoCAD完成转向系统及相关零件的设计图纸。
本文从四个方面展开对转向系统设计:一、汽车整体参数对汽车转向的影响;二、机械转向器的选型与结构参数的设计计算校核;三、转向梯形的结构设计;四、动力转向系统的方案确定和参数选择。最终得到一个转向系统的整体设计方案。
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关键词:转向系统;液压助力转向器;曲柄指销;转向梯形
Abstract
Automobile is always required to be absolutely safe when it is used to carry passengers and cargo. Therefore, safety has been the primary concern of research, design and manufacturer since the automobile came out one hundred years ago. Due to the general trend of efficient and energy-saving development of modern automobiles, the design speed of automobiles is getting higher and higher. In addition, the large number of existing automobiles is still increasing. Therefore, improving the safety of automobiles, especially the active safety, has become a subject that almost all automobile manufacturers tirelessly study. Vehicle steering system is a main body of vehicle handling system, which is closely related to vehicle handling and stability. Therefore, their design level, manufacturing quality and reliability are the important support of active safety of vehicles.
The vehicle selected in this paper belongs to heavy-duty truck, and a matching integral two-wheel steering system is selected. Based on the knowledge of automobile design and kinematics, the overall parameters of automobile are selected firstly. On this basis, the scheme of steering gear, steering transmission mechanism and steering assist system is determined. Then the steering gear, steering drive mechanism and steering assist system are designed, and the motion of the system is checked by CATIA software. Finally, AutoCAD is used to complete the design drawings of steering system and related parts.
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This paper starts the design of steering system from four aspects: first, the influence of vehicle overall parameters on vehicle steering; second, the selection of mechanical steering gear and the design calculation and verification of structural parameters; third, the structural design of steering trapezium; fourth, the scheme determination and parameter selection of power steering system. Finally, an overall design scheme of steering system is obtained.
Key words: steering system;electro-hydraulic power system;cam and lever steering gear
本次设计以东风天龙重卡DFL4180为参考车型进行设计,该车为4×2牵引车,平顶驾驶室,以下是该车型的结构参数。
DFL4180牵引车相关参数
参数名称 数值 单位
外形尺寸 6330×2500×3030 mm
轴距 3500 mm
轮距(前/后) 2027/1820 mm
整备质量 7100 kg [版权所有:http://DOC163.com]
总质量 18000 kg
拖挂车总质量 21500 kg
轴荷 5000/13000 kg
驱动方式 4×2 -
轮胎数 6 个
轮毂 7.5V-20 -
轮胎型号 10.00R20 -
轮胎气压 840 kPa
前轮外倾 1° 度
主销内倾角 7° 度
主销后倾角 1°52’37” 度
内轮 42° 度
外轮 34° 度
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目录
第1章绪论 1
1.1 课题研究背景与目的意义 1
1.2电控液压助力转向系统国内外研究发展 2
1.3总体设计内容及目标 2
第2章转向系统方案 4
2.1转向系统概述 4
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2.2转向系统方案 5
2.3整车主要结构参数 5
第3章机械转向系统部分设计计算 7
3.1转向系的主要性能参数 7
3.1.1 转向系计算载荷 7
3.1.2 转向器效率 7
3.1.3 传动比变化特性 8
3.1.4 力传动比与转向系角传动比的关系 10
3.2转向器主要参数确定 11
3.3转向蜗杆设计 13
3.3.1 螺纹导程角α 13
3.3.2 蜗杆螺纹齿厚 13
3.3.3 蜗杆齿槽 14
3.3.4 蜗杆切削进刀量及指状铣刀最小摆动角 15
3.3.5 蜗杆图的绘制 16
3.4指销及指销轴承的设计 18
3.5曲柄垂臂轴设计 18
3.6曲柄指销转向器零件强度校核 20
3.6.1 蜗杆传动受力分析 20
3.6.2 蜗杆螺纹接触强度校核 20
3.7转向梯形优化 21 [来源:http://www.doc163.com]
第4章动力转向系统设计 23
4.1动力缸主要尺寸计算 23
4.3分配阀尺寸 25
4.4 转向助力泵与电机选型 26
第5章总结 28
参考文献 29
致谢 31
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