Chapter 3 Coupling and Drive Axle Section 2 Drive axle 1.Functions and Types of Drive Axles 1.1 Drive Axle and Their Function Automobiles'and tractors'drive axles are all transmission components and the shells between driving wheels and the transmission except drive shaft and coupling.The main functions of drive axles:First,they transmit engine torque came from the universal joint to the driving wheel through the final drive,differential, half-axle,etc.,and achieve to speed reduction and torque growth; Second,changing the direction of torque through the bevel gear pair of the final drive to make it parallel with the vehicle traveling direction; Third,ensuring that the speed of inside and outside wheels are not the same through the differential to achieve steering. 1.2 The Components and Types of Drive Axles Components:the final drive,differential,half-axle,housing,etc. 械电子工程学 Automobile and Tractor Northwest A&F University Automobile and Tractor Northwest A&F University Chapter 3 Coupling and Drive Axle 1. Functions and Types of Drive Axles 1.1 Drive Axle and Their Function Automobiles’ and tractors’ drive axles are all transmission components and the shells between driving wheels and the transmission except drive shaft and coupling. The main functions of drive axles： First, they transmit engine torque came from the universal joint to the driving wheel through the final drive, differential, half-axle, etc., and achieve to speed reduction and torque growth; Second, changing the direction of torque through the bevel gear pair of the final drive to make it parallel with the vehicle traveling direction; Third, ensuring that the speed of inside and outside wheels are not the same through the differential to achieve steering. 1.2 The Components and Types of Drive Axles Components: the final drive, differential, half-axle, housing, etc.. Section 2 Drive axle