WorksheetsFundamentals of axles
Total questions: 36
Worksheet time: 18mins
Pusher axles are located in front of the _______.
drive, or main axles
steering axles
rear bumper
engine compartment
Tag axles are located _______ the drive axle.
in front of
behind
beside
above
A self-steering tag or pusher axle can usually be lifted when not needed.
True
False
What is the function of a drive axle (or live axle) in a vehicle?
To steer the vehicle
To contain the gearing necessary to drive the vehicle
To provide suspension
To control braking
What is the most popular type of steer axle in trucks?
Two-piece axle
One-piece I-beam style
Tubular axle
Split axle
Steer axles on heavy trucks are usually of which type?
Tubular type
Split type
I-beam type
Box type
The wheel spindles, also known as steering knuckles, are attached to the I-beam with which of the following?
Bolts and nuts
Kingpins and bushings
Screws and washers
Rivets and plates
Some heavy-duty vehicles have dual steering boxes, one on each side of the vehicle.
True
False
The amount of load the axles carry can be adjusted by controlling the _______ in the axle’s air bag suspension.
air pressure
oil level
spring tension
brake fluid
Dead axles, like this pusher axle, can be raised or lowered, when required, by the driver.
True
False
What is the primary function of stingers in vehicles?
Decrease the vehicle's length
Increase the effective length and payload capacity of the vehicle
Reduce fuel consumption
Improve braking efficiency
Stingers can increase payloads by up to five tons.
True
False
What is the primary function of trailer dead axles?
To steer the vehicle
To support vehicle weight and provide attachment points for brakes and suspension
To increase fuel efficiency
To provide power to the wheels
Bevel gears consist of a relatively small driving gear known as the _______ gear and a large gear known as the crown gear or ring gear.
pinion
spur
worm
helical
The crown gear is attached to the differential case, which houses the differential gears.
True
False
Explain fundamentals of axles. Name one benefit of spiral bevel gears.
Boost torque capacity
Increase friction
Reduce efficiency
Increase noise
Durapoid gearing improves the ______ and load-carrying capacity of spiral bevel gears.
strength
noise
cost
weight
What is one advantage of hypoid gearing compared to a normal spiral bevel gear?
It increases the center of gravity of the vehicle
It lowers the center of gravity of the vehicle
It reduces the strength of the gear
It increases friction between gear teeth
What is the primary drawback to hypoid gear sets?
Lower friction between gear teeth
Deeper mesh of the pinion gear leads to higher friction between gear teeth
Reduced strength of the gear
Pinion gear is mounted above the centerline
Fill in the blank: In a hypoid gear set, the pinion is mounted ______ the centerline of the crown gear.
below
above
on
beside
Fill in the blank: The tooth drive face side of the amboid crown gear is the ______, not the convex.
concave
circular
flat
tapered
The main advantage of having the pinion mounted above the centerline of the crown gear in amboid gears is:
It allows for a lower driveshaft position and increased ground clearance.
It increases the gear ratio for higher speed.
It reduces the overall weight of the gear assembly.
It improves lubrication efficiency.
What is a topoid gear?
A lower-mounted amboid system
A higher-mounted amboid system that reduces driveline angles and vibration
A type of axle with no gear
A system that increases vibration
Which of the following statements is true about generoid gears?
A) They increase tooth end loading and have less strength than hypoid designs.
B) They eliminate tooth end loading and deliver greater strength than traditional hypoid designs.
C) They do not require any lubricant.
D) They are weaker than bevel gears.
What is the function of the carrier in a drive axle?
The carrier holds the support bearings for the drive axle gearing.
The carrier transmits power directly to the wheels.
The carrier acts as a shock absorber for the axle.
The carrier lubricates the axle bearings automatically.
What does the integral drive axle housing have machined into it?
The mounts for the drive axle bearings.
The oil filter housing.
The transmission fluid reservoir.
The brake caliper mounts.
To access the gearing or bearing for repair in a removable/banjo carrier type housing, what must be done?
The entire carrier is removed from the housing.
Only the gears are removed.
The housing is cut open.
The bearings are replaced without removing the carrier.
Explain the design and functions of differential gear sets. When turning, the inside wheels follow a smaller curve than the outside and, therefore, travel a shorter distance. Which of the following statements is true?
The inside wheels travel a longer distance than the outside wheels during a turn.
The inside wheels travel a shorter distance than the outside wheels during a turn.
Both inside and outside wheels travel the same distance during a turn.
The outside wheels do not move during a turn.
The function of the differential cross in a heavy-duty vehicle differential gear set is to:
Allow the wheels to rotate at different speeds during turns.
Transmit power directly from the engine to the wheels.
Increase the overall speed of the vehicle.
Reduce the noise produced by the gear set.
Fill in the blank: When a vehicle negotiates a turn, the ______ gear slows down and the ______ gear speeds up.
inside, outside
outside, inside
front, rear
left, right
What is the function of thrust washers in differential gear sets?
To absorb the heavy thrust loads caused by bevel gears
To lubricate the gears
To connect the gears
To reduce noise
Spider gear can get easily damaged when one wheel of a differential spins.
True
False
What causes the spider gear to get damaged as shown in the image?
Excessive lubrication
Heat generated from spinning out
Lack of movement
Low speed operation
Which of the following is a major drawback of a differential?
It allows wheels to rotate at different speeds
It requires more torque on slippery surfaces
It allows a wheel to spin on a slippery surface with less torque
It prevents wheel spin
In a spin-out condition, the spinning wheel, its axle shaft, and its side gear are turning twice as fast as the differential case.
True
False
What happens when locking differential systems are activated?
When activated, these systems prevent one side gear from turning, which stops any movement of the spider gears in the differential.
They allow both wheels to spin at different speeds, improving cornering.
They disengage the drive shaft from the wheels, putting the vehicle in neutral.
They increase the speed of the vehicle automatically.
