Chapter 29. DIFFERENTIALS, FINAL DRIVES, AND DRIVING AXLES

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Figure 28-8. Double Cross and Roller Constant Velocity Joint.

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TM-9-8000 Principles of Automotive Vehicles Manual

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Figure 29-2. Conventional Driveshaft.

TM 9-8000

CHAPTER 29

DIFFERENTIALS, FINAL DRIVES, AND DRIVING AXLES

Section I. CONVENTIONAL DIFFERENTIALS

bevel drive pinion rotates the bevel drive ring gear and

29-1.

Purposes (Fig. 29-1).

the differential case to which the final drive gear is

bolted. The axle shafts are splined to the differential side

a. Transmit Torque to Axles. One of the purposes

gears. Were it not for the differential pinions, each

of the differential is to transmit engine torque to the drive

wheel, with its respective axle shaft and side gear, would

axles. The drive axles usually are on a rotational axis

rotate freely with respect to the differential case and

that is 90 degrees different than the rotational axis of the

bevel drive gear.

a. Straight Ahead. When both wheels are rotating

b. Divide Engine Torque. Another purpose of the

at the same speed, as they do on a smooth, straight

differential is to divide engine torque between the driving

road, the differential pinions do not rotate around their

wheels so that they are free to rotate simultaneously at

own axis but serve only to

varying speeds. This is important particularly if the

vehicle is not moving in a straight line.

29-2.

Principles of Operation

(Fig.

The

Figure 29-1. Differential Operation.

29-1