401h Drive Axle Assembly Fundamentals (On-Road) Flashcards Preview

HET4 190401 Clutch/ Driveline/ Transmission > 401h Drive Axle Assembly Fundamentals (On-Road) > Flashcards

Flashcards in 401h Drive Axle Assembly Fundamentals (On-Road) Deck (29):
1

List the four (4) functions of the drive axle assembly.

- The drive axle assembly must withstand and support the weight of the vehicle and load that has been passed through the suspension system to the drive axle assemblies.
- The drive axle assembly provides the last gear reduction in the basic vehicle powertrain.
-The drive axle assembly must change the direction of torque by 90°.
- The drive axle must transfer torque evenly between the two wheel assemblies it is driving while allowing for a difference in speed between the two.

2

The weight rating that refers to how much each axle can carry is called the:

gross axle weight rating (GAWR).

3

The gross combination weight rating refers to the:

total combined gross axle weight ratings for a vehicle and its trailers.

4

The reason a driving axle would be added to the rear of a truck rather than a non-driving (tag or pusher) would be to:

increase traction.

5

The percentage of grade at which a drivetrain system can start a loaded vehicle moving at idle is called:

startability.

6

Which components are attached to the drive axle housing?
a) suspension components
b) wheels tires and hubs
c) carrier housing
d) all of the above

d) all of the above.

7

The main function of the carrier housing is to:

hold the internal gear components.

8

The pinion bearing cage is always a removable component of the carrier housing.
T/F

false; It may be a removable piece of the carrier housing or an integral component.

9

The overhung pinion differs from the straddle mount in that it has a short stub that extends past the end of the pinion gear.
T/F

false; The overhung mount pinion can be distinguished by the flat surface at the end of the pinion gear. A short stub shaft that extends past the end of the pinion gear characterizes the straddle mount pinion design.

10

The input drive pinion is in constant mesh with the:

bevel gear.

11

What is the main purpose of the thrust screw?

The thrust screw prevents the bevel gear from deflecting away from the input pinion during heavy torque loads.

12

The bevel gear is bolted directly to the:
a) carrier housing.
b) differential pinions.
c) plain case half.
d) flanged case half.

d) flanged case half.

13

The differential pinions are driven by the:
a) cross shafts.
b) axle side gears.
c) bevel gear.
d) case halves.

a) cross shafts.

14

The most common differential carrier assembly used today is the:
a) single speed single reduction.
b) single speed double reduction.
c) two speed double reduction.
d) planetary carrier.

a) single speed single reduction.

15

Number the following components in the path-of-power through the single speed single reduction carrier assembly. Begin with the input shaft yoke and end with the wheel assemblies.
input yoke _____________
differential cross shaft _____________
differential case _____________
axle shafts _____________
input drive pinion _____________
bevel gear _____________
axle side gears _____________
differential pinions _____________
wheel assemblies _____________

input shaft yoke 1
differential cross shaft 5
differential case 4
axle shafts 8
input drive pinion 2
bevel gear 3
axle side gears 7
differential pinions 6
wheel assemblies 9

16

On a two speed double reduction carrier assembly, the component that drives the helical drive gear is the:
a) cross shaft.
b) bevel gear.
c) helical driven gear.
d) shift collar.

d) shift collar.

17

In the planetary differential carrier assembly, low gear is achieved when:
a) the sun gear is locked to the retainer plate.
b) the sun gear is locked to the carrier.
c) the carrier is locked to the bevel gear.
d) the bevel gear is locked to the internal gear.

a) the sun gear is locked to the retainer plate.

18

The torque available to the wheel with good traction in a wheel spin condition is:

d) the same as the torque to the spinning wheel.

19

When a vehicle is turning a corner, the differential assembly allows the:
a) inner drive wheel to rotate faster than the outer drive wheel.
b) outer drive wheel to rotate faster than the inner drive wheel.
c) bevel gear to rotate at the same speed as the outer drive wheel.
d) bevel gear to rotate at the same speed as the inner drive wheel.

b) outer drive wheel to rotate faster than the inner drive wheel.

20

The inter-axle differential is physically located:
a) between the front and rear drive axle assemblies.
b) in the front drive axle assembly.
c) in the rear drive axle assembly.
d) in the driveline before the front drive axle assembly.

b) in the front drive axle assembly.

21

The input shaft drives the helical drive gear through a set of splines.
T/F

false; The input shaft drives the differential shaft through a set of splines.

22

The cross shafts of the inter-axle differential are driven by the:
a) case halves.
b) helical drive gear.
c) differential pinions.
d) input shaft.

d) input shaft

23

The lockout assembly of the inter-axle differential locks what two components?
a) input shaft and cross shaft
b) input shaft and helical drive gear
c) helical drive gear and the output haft
d) input shaft and the inter-axle differential case

b) input shaft and helical drive gear.

24

Semi-floating axle shafts can be removed from a vehicle when the weight of the vehicle is on the drive wheels.
T/F

false; To remove the semi-floating axles, the vehicle weight must be supported and the drive wheels must be off the ground.

25

On a drive axle assembly using a planetary final drive system, the input member of the planetary system is the:

sun gear

26

Identify the two (2) main drive axle lubrication systems.

- splash lubrication
- combination splash and pressure lubrication

27

Explain the drive axle filtration systems.

The drive axle assemblies use magnetic drain plugs, magnetic screens and spin on filters to filter and clean the oil.

28

A differential assembly equipped with a no-spin assembly allows for normal differential action when the vehicle turns a corner.
T/F

true

29

When the operator activates the driver controlled differential lock, the operator is mechanically locking:
a) the axle shafts together.
b) the two case halves together.
c) the differential pinions to the axle side gears.
d) one axle shaft to the differential case.

d) one axle shaft to the differential case.