摘要:驱动桥处于动力传动系的末端，其基本功能是：①将万向传动装置传来的发动机转矩通过主减速胎、差速器、半轴等传到驱动车轮，实现降速增大转矩；②通过主减速器圆锥齿轮副改变转矩的传递方向；③通过差速器实现两侧车轮差速作用，保证内、外侧车轮以不同转速转向。

驱动桥作为轿车四大总成之一，它的性能的好坏直接影响整车性能，而对于家用轿车显得尤为重要。当采用大功率发动机输出大的转矩以满足目前轿车的快速、载荷的高效率、高效益的需要时，必须要搭配一个高效、可靠的驱动桥。所以采用传动效率高的单级减速驱动桥已成为未来轿车的发展方向。本文参照传统驱动桥的设计方法进行了轿车驱动桥的设计。本文首先确定主要部件的结构型式和主要设计参数；然后参考类似驱动桥的结构，确定出总体设计方案；最后对主，从动锥齿轮，差速器圆锥行星齿轮，半轴齿轮，全浮式半轴和整体式桥壳的强度进行校核以及对支承轴承进行了寿命校核。本文不是采用传统的双曲面锥齿轮作为载重轿车的主减速器而是采用弧齿锥齿轮。

关键字：驱动桥，单级减速桥，弧齿锥齿轮

Abstract:Axles in the end of powertrain system, its basic function is: (1) to the engine driving device universal came through the slow torque, differential and half shaft drive wheels, etc.To dec increases torque, 2 the taper gear reducer through the transmission torque, vice change direction, 3 sides realized by differential wheel differential effect, guarantee the inner and outer side wheels with different speed.

Drive axle is the one of automobile four important assemblies. It` performance directly influence on the entire automobile，especially for the heavy truck .Because using the big power engine with the big driving torque satisfied the need of high speed，loaded，high efficiency，high benefit today`heavy truck，must exploiting the high driven efficiency single reduction final drive axle is becoming the truck`developing tendency. This design following the traditional designing method of the drive axle. First ，make up the main parts`structure and the key designing parameters; thus reference to the similar driving axle structure ， decide the entire designing project ; fanially check the strength of the axle drive bevel pinion ，bevel gear wheel ， the differentional planetary pinion， differential side gear ， full-floating axle shaft and the banjo axle housing ， and the life expection of carrier bearing .

Key words: drive axle,single reduction final drive,the spiral bevel gear