摘  要
 
本次设计的题目是BJ1090汽车驱动桥设计。驱动桥一般由主减速器、差速器、半轴及桥壳四部分组成，其基本功用是增大由传动轴或直接由变速器传来的转矩，将转矩分配给左、右车轮，并使左、右驱动车轮具有汽车行驶运动学所要求的差速功能；此外，还要承受作用于路面和车架或车厢之间的铅垂力、纵向力和横向力。
BJ1090汽车是重型载货汽车，要保证足够的离地间隙，满足汽车的通过性，同时需要满足较大的传动比，本文首先确定驱动桥的总体结构，在分析驱动桥各部分结构型式，及其以往形式的优缺点的基础上，确定了总体设计方案：采用整体式驱动桥，主减速器的减速型式采用双级减速器，主减速器齿轮采用螺旋锥齿轮，差速器采用普通对称式圆锥行星齿轮差速器，半轴型式采用全浮式，桥壳采用铸造整体式桥壳。在本次设计中， 主要完成了双级减速器、圆锥行星齿轮差速器、全浮式半轴、桥壳的设计工作。
 
关键词： 驱动桥；主减速器；全浮式半轴；桥壳；

ABSTRACT
 
The object of the design is The Design for Driving Axle of Heavy Truck. Driving Axle is consisted of Main Decelerator, Differential Mechanism, Half Shaft and Axle Housing. The basic function of Driving Axle is to increase the torque transmitted by Drive Shaft or directly transmitted by Gearbox, then distributes it to left and right wheel, and make these two wheels have the differential function which is required in Automobile Driving Kinematics; besides, the Driving Axle must also stand the lead hangs down strength, the longitudinal force and the transverse force acted on the road surface, the frame or the compartment lead.
BJ1090 cars are heavy duty truck, to ensure the adequate ground clearance, meet the car by sex, at the same time need to meet large transmission ratio, the configuration of the Driving Axle is introduced in the thesis at first. On the basis of the analysis of the structure and the developing process of Driving Axle, the design adopted the Integral Driving Axle, Double Reduction Gear for Main Decelerator’s deceleration form, Spiral Bevel Gear for Main Decelerator’s gear, Full Floating for Axle and Casting Integral Axle Housing for Axle Housing. In the design, we accomplished the design for Double Reduction Gear, tapered Planetary Gear Differential Mechanism, Full Floating Axle and Axle Housing.
 
Key words: Driving Axle; Main Decelerator; Full floating axle; Axle Housing; Differential Mechani