机械5

江铃JX1043轻型载货汽车转向器设计 摘要 汽车转向系的功用是保持或者改变汽车行驶方向的机构。在汽车转向行驶时，保证各转向轮之间有协调的转角关系,使汽车能按驾驶员的意志而进行转向行驶。而转向器中的类型中，齿轮齿条式转向器由于其自身的特点被广泛应用于各种汽车上。本设计以江铃JX1043轻型货车为设计对象，根据原有数据计算转向系的传动比，并确定齿轮齿条的几何参数。齿轮齿条式转向器总体设计，受力分析，及对齿轮齿条的疲劳强度校核、齿根弯曲疲劳强度校核，通过对齿轮齿条式转向器的设计，选取出相关的零件，并在说明书中画出相关零件的零件图。 关键词:齿轮齿条；转向器；设计；校核 Abstract The fu
nctio
n of automotive steeri
ng system is to mai
ntai
n or cha
nge the directio
n of vehicle travel age
ncy a
nd to assure the coordi
nate steeri
ng a
ngle relatio
nship betwee
n the wheels, so the vehicle ca
n be veered accordi
ng to the driver. A
nd amo
ng all ki
nds of steeri
ng gear, rack a
nd pi
nio
n steeri
ng gear is widely used i
n various ki
nds of automobile because of its ow
n characteristics. The desig
n object i
n this paper is Jia
ngli
ng JX1043 light truck. We will calculate the tra
nsmissio
n steeri
ng ratio accordi
ng to the origi
nal data, a
nd determi
ne the geometric parameters of gear rack. There will be the overall desig
n of the rack a
nd pi
nio
n steeri
ng, it’s stress a
nalysis, the exami
natio
ns of fatigue stre
ngth of gear a
nd the be
ndi
ng fatigue stre
ngth of tooth root. We will select the releva
nt compo
ne
nts a
nd show the parts drawi
ng i
n the specificatio
n sheet. Key Words: rack a
nd pi
nio
n; steeri
ng; desig
n; check. 目录 1绪论................................................................ .1 1.1引言1 1.2汽车转向系统的现状及设计趋势1 1.2.1传统机械转向系统1 1.2.2液压助力转向系统1 1.2.3电液助力转向系统............................................ 2 1.2.4线控转向系统2 1.3汽车转向装置的设计趋势2 1.4小结3 2汽车转向系统4 2.1概述4 2.1.1转向系组成4 2.1.2对转向系统设计的要求5 3方案论证及确定7 3.1循环球式转向器7 3.2蜗轮滚轮式转向器9 3.3蜗杆指销式转向器9 3.4齿轮齿条式转向器10 3.5小结13 4转向器主要性能参数计算14 4.1原地转向阻力矩MR的计算14 4.2转向盘手力15 4.3角传动比与力传动比15 4.4转向车轮的最大转角17 4.5转向梯形机构尺寸初步确定18 5齿轮的设计20 5.1齿轮的参数选择20 5.2齿轮的设计计算20 5.3强度校核21 5.3.1齿轮弯曲疲劳强度计算21 6齿条的设计25 6.1根据齿轮齿条的齿合特点25 6.2齿条的设计计算26 7齿轮轴的设计27 7.1齿轮轴的结构形式27 7.2齿轮齿条传动受力分析27 7.3齿轮轴的强度校核28 7.3.1轴的受力分析28 7.3.2计算支承反力28 7.3.3计算弯矩28 7.3.4画转矩图29 7.3.5判断危险剖面29 7.4轴的弯扭合成强度校核30 7.4.1轴的疲劳强度安全系数的校核30 8其他零件的选择与设计32 8.1间隙调整弹簧的选择32 8.1.1选择材料32 8.1.2确定弹簧丝直径，选择弹簧指数C 32 8.1.3确定弹簧工作圈数32 8.2轴承的选择33 8.3其他零件的选择33 结束语. 34 致谢35 参考文献36