Chapter 67 POWERPOINT

Use the textbook to define these Technical Terms:

1. Constant Velocity Universal Joint-

2. Drive Shaft-

3. Driveline-

4. Slip Yoke-

5. Transfer Case-

6. U-Joint (Universal Joints)-

Use the textbook to answer these discussion questions:

1. Explain the functions of a drive shaft.

2. List the different types of drivelines.

3. Explain the basic operation of a transfer case.

Read the chapter summary below:

Summary

■ The term driveline generally refers to the parts that transfer power from the transmission to the drive wheels.

■ A drive shaft is a long shaft with universal joints at both ends that transfers power from the transmission back to the rear axle assembly.

■ A universal joint allows the driveline to flex as the rear axle moves up and down.

■ The slip yoke, splined to the transmission output shaft, allows for any changes in driveline length by sliding in and out of the transmission.

■ The extension housing bushing supports the slip yoke as it spins in the transmission.

■ The transmission rear seal rides on the slip yoke and prevents fluid leakage.

■ The propeller shaft is commonly a hollow steel tube with permanent yokes welded on each end.

■ Drive shaft balancing weights are frequently welded to the shaft to avoid vibration.

■ The cross-and-roller (cardan) universal joint is the most common type of drive shaft universal joint.

■ A constant velocity joint normally has two cross- and-roller joints connected by a centering socket and center yoke.

■ The ball-and-trunnion joint is designed for constant velocity.

■ A center support bearing is needed to hold the middle of a two-piece drive shaft.

■ A transfer case sends power to both the front and rear axle assemblies in a four-wheel-drive vehicle.

■ All-wheel drive refers to a four-wheel-drive system that does not use a conventional transfer case.