ATASA 5 4 Wheel Drive & All Wheel Drive...ATASA 5 th Study Guide Chapter 43 Pages 1271 1296 4 Wheel Drive & All Wheel Drive 30 Points ATASA 5 th 4 Wheel Drive & All Wheel Drive1. 4WD

ATASA 5 th Study Guide Chapter 43 Pages 1271 1296 4 Wheel Drive & All Wheel Drive 30 Points

ATASA 5 th 4 Wheel Drive & All Wheel Drive

Be Certain to Read the Summary

1. 4WD & AWD can drastically increase a vehicle’s _______________ and ________________ ability in rain, snow & offroad conditions and greater amounts of energy can be sent through the drive line.

steering & suspension traction & handling value & life expectancy


2. 4WD systems have a separate ________________ _________ and give the operator the choice of operating in either 2WD or 4WD. Locking hubs can be either manual or automatic locking.

transfer case needle case crank case


3. 4WD systems may or may not use an _________________ differential or ____________ clutch to distribute power to its front & rear drive lines.

intertwined interaxle integrated


Viscous Nasty Oneway


4. Many 4WD trucks have the option of _____ range for extra traction in especially rough conditions such as deep snow or mud. 4WD low range is not for dry pavement use!

2 Hi 4 Hi 4 Lo


5. AWD systems may or may not have a separate transfer case, they do use a FWD ________________ equipped with a viscious clutch, center differential or transfer clutch to transfer power to the rear.




6. AWD systems do not give the driver the option of selecting _____ or ______ modes, AWD operates in a continuous 4WD. Some AWD have an electromagnetic clutch in the transfer case.

2WD or 4WD 1WD or 2WD 3WD or 4WD


7. _____________________ allow for the outer wheels rolling faster than the inner wheels during turns.

Differentials Transmissions Transfer Cases


8. _______________ joints are used to couple drive shafts to the differentials and transfer cases.

Constant Velocity Universal Plunge


9. Either Ujoints or ___ joints are used to couple axles or half shafts to hubs.

RV UV CV


10. When 2 driving axles have different ratios the result is a pushpull action called driveline _________.

Windup Coast down Spool up



11. To dissipate driveline windup, an ______________ ______________ within the transfer case is used.

Interaxle differential Integrated transfer case Innermost triaxle


Some vehicles use a viscous clutch to distribute torque 35% to the front & 65% to the rear.


Limited slip differentials apply the torque to the wheel with the most traction.


Open differentials apply the torque to the axle with the least resistance. (easiest to turn & least traction)


AWD systems spread the driving force to all four wheels at all times. ATASA 5 th 4 Wheel Drive & All Wheel Drive

AWD biases or splits the driving torque to the axle that has the traction only when it is needed.


12. Viscious clutches operate ______________________ while constantly transmitting power to the axle assembly as soon as it becomes necessary to improve driving wheel traction.

Automatically Electronically Pneumatically


13. This action is known as biasing driving torque to the axle with __________ effort.


Laxative Tractive Reactive

14. A viscious clutch is made of a sealed, wet, multidisc clutch ________ fit inside of a clutch drum…to form a clutch pack.


Rates Plates Lates

15. A special _____________ fluid transmits force from the driving plates to the driven plates in a VC.


Silicone Nitrogen Petroleum

16. When a difference of speed of ____% exists between the input shaft driven by the driving axle with “tractive effort”, the clutch plates begin shearing the special silicone fluid.

1% 8% 15%


17. Shearing action ________ the fluid & causes it to stiffen & lock between the plates within 100 mSec!


Cools Heats Melts

18. The special silicone fluid also provides for a selfregulating control of the VC. True or False


19. Some AWD vehicle are equipped with a ____________ clutch located in front of the rear differential. It is ECU controlled and equipped with an electric pump & accumulator for fast reaction time.


Torrington Haldex Extroid



20. It is safe to say that most manufacturers are offering some type of AWD system. True or False


Neutral

RWD

4WD Lo

4WD Hi

21. When front hubs are ________ in 2WD, the front wheels turn, but the differential & drive shaft don’t.

Unlocked Locked


22. When front hubs are ___________, the wheels turn directly with the axles for most traction.

Locked Unlocked www.4x4abc.com


23. A disadvantage of ________________ hubs is that power cannot be applied to the wheels in reverse.

Selflocking Nonlocking


24. Most passenger cars with 4WD are not designed for the rigors of _____ _______ driving.

OnRoad OffRoad TollRoad


25. Passenger car AWD systems ___ ____ give the driver the option of 2WD or 4WD, they always drive all wheels. Many are also outfitted with a traction control or stability control system too.

Do Not


26. Shift onthefly systems use an electromagnetic _________ in the transfer case to help synchronize the front drive line to the transmission speed so that an electric motor can complete the shift.

Clutch Solenoid Relay


27. ____ ___________ systems operate at the discretion of the PCM to override driver settings.

OnESPN OnBoard OnDemand









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ATASA 5 4 Wheel Drive & All Wheel Drive...ATASA 5 th Study Guide Chapter 43 Pages 1271 1296 4 Wheel Drive & All Wheel Drive 30 Points ATASA 5 th 4 Wheel Drive & All Wheel Drive1. 4WD