论文总字数：17233字

摘 要

本次毕业设计的题目是2t电动叉车转向系统和转向桥设计，并完成2 t电动叉车的转向系统结构、部件调研；确定转向桥中各部件的选择方案等，绘制转向梯形机构简图，并进行梯形机构运动分析；进行转向阻力的初步计算。确定液压转向器型式、转向油缸工作压力、流量及基本尺寸；并对转向系统、转向桥和车轮等做校核计算。并绘制转向系统方案图和转向桥总成图和一定量的零件工作图。

本次毕业设计是对叉车转向系统的设计一次良好的实践和学习的机会。通过此次毕业设计，我从中学习到很多有关设计方面的知识，培养了我独立思考设计的能力，让我对初步的机械设计制造有了充分的了解，这对我以后的工作学习有很大的帮助。

关键词：四支点；电动叉车；转向系统；转向桥

Steering motion analysis and steering bridge

design of four-pivot electric vehicle

Abstract

The topic of this graduation project is the steering system and steering bridge design of 2t electric forklift, and the research on steering system structure and components of 2t electric forklift is completed.The selection scheme of each component in steering bridge is determined, the diagram of steering trapezoid mechanism is drawn, and the movement analysis of the trapezoid mechanism is carried out. The steering system, steering bridge and wheels are checked and calculated.Draw steering system scheme diagram and steering bridge assembly diagram and a certain amount of parts work diagram.

This graduation project is a good practice and learning opportunity for the design of forklift steering system.Through this graduation project, I learned a lot of knowledge about design, which cultivated my ability of independent thinking and design, and enabled me to have a full understanding of the preliminary mechanical design and manufacturing, which will be of great help to my future work and study.

Keywords: Four Fulcrum, Electric Fork-lift Truck, Steering System, Steering Axle

目 录

摘 要 I

Abstract ..............II

第一章 绪 论.. .....................................................................................................................................................1

1.1 电动叉车概述 1

1.2 设计要求与设计步骤分析 1

1.2.1技术设计.......................................................................................................................................1

1.2.2方案设计.......................................................................................................................................21.3 四支点电动车转向系统 ........................................................................................................................21.3.1转向系统图与组成、设计要点说明............................................................................................2

1.3.2转向桥装配图与组成、设计要点说明.......................................................................................3

第二章 总体基础设计计算 4

2.1 叉车的基本参数选定 4

2.2转向系统的整体选择及其设计计算......................................................................................................4

2.2.1转向系统选择...............................................................................................................................4

2.2.2最小转弯半径的分析...................................................................................................................4

2.3 叉车的转向机构设计 5

2.3.1叉车的转向机构选择...................................................................................................................5

2.3.2曲柄滑块机构设计 6

2.3.3转向阻力转矩的计算...................................................................................................................7

2.3.4油缸行程和最大推力计算...........................................................................................................8

2.3.5转向油缸的设计.........................................................................................................................10

2.3.6全液压转向器的选择.................................................................................................................12

2.4转向桥的设计计算及强度校核............................................................................................................12

2.4.1转向桥的计算载荷.....................................................................................................................12

2.4.2转向桥的强度计算.....................................................................................................................13

第三章 部件与零件设计计算............................................................................................................................18

3.1转向节强度计算............................................................................................................................18

3.2主销强度计算................................................................................................................................193.3车轮轴承计算................................................................................................................................20

3.4主销轴承计算................................................................................................................................21

结束语 22

致 谢 23

参考文献 24

第一章 绪 论

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