5. ADVANTAGES OF FEFWD
• Interior space: Since the power train is a single unit
contained in the engine compartment of the vehicle, there is
no need to devote interior space for a driveshaft tunnel or
rear differential, increasing the volume available for
passengers and cargo.
• Cost: Fewer components overall
Weight Fewer components lower weight
• Weight: Fewer components mean lower weight
• Fuel economy: Lower weight means better mileage.
• Improved drive train efficiency: the direct connection
between engine and transaxle reduce the mass and mechanical
inertia of the drive train compared to a rear-wheel drive
vehicle with a similar engine and transmission, allowing
greater fuel ecconomy.
•
6. • Assembly efficiency: The power train can often be
assembled and installed as a unit, which allows more
efficient production.
• Slippery-surface traction: Placing the mass of the
drive train over the driven wheels
improves traction on wet, snowy, or icy surfaces.
Although heavy cargo can be beneficial for traction
on rear-wheel drive pickup trucks.
7. DISADVANTAGES OF FEFWD
• Front-engine front-wheel-drive layouts are
"nose heavy" with more weight distribution
forward, which makes them prone to under
steer, especially in high horsepower
applications
applications.
• Tractive effort is reduced during acceleration.
9. ADVANTAGES OF FERWD
• Better handling in dry conditions - accelerating force is
applied to the rear wheels, on which the down force increases,
due to load transfer in acceleration, making the rear tires better
able to take simultaneous acceleration and curving than the
front tires.
• More predictable steering: In low traction conditions (ie: ice
gravel) because the steering wheels maintain traction and
or gravel) because the steering wheels maintain traction and
the ability to affect the motion of the vehicle even if the drive
wheels are slipping.
• Less costly and easier maintenance:- Rear wheel drive is
mechanically simpler and typically does not involve packing
as many parts into as small a space, thus requiring less
disassembly or specialized tools in order to replace parts.
10. • No torque steer.
• Even weight distribution - The division of weight
between the front and rear wheels has a significant impact
on a car's handling, and it is much easier to get a 50/50
weight distribution in a rear wheel drive car than in a
front wheel drive car.
11. DISADVANTAGES of FERWD
• Decreased interior space
• Increased weight
• Higher purchase price
• More difficult handling on low grip surfaces (wet
road, ice, gravel) the is pushed rather
road, ice, snow, gravel) as the car is pushed rather
than pulled. In modern rear drive cars, this
disadvantage is offset by electronic stability control
and traction control.
13. ADVANTAGES-RERWD
• Better road adhesion preferably on steep hills and
while accelerating with increased weight on the
driving wheels.
• Front wheels are only for steering purpose.
only purpose
• Good visibility and stream lining is provided by
proper design of vehicle front.
14. DISADVANTAGES-RERWD
• To control engine, clutch, gear box long linkages are
required.
• Width of the car front gets reduced for
accommodating the steering system, Hence luggage
compartment for given length and the car reduced.
• Efficient cooling will be very difficult to obtain for
screening of the engine by vehicle body. (Rear air
ducts)
18. 4WD
ADVANTAGES:
• Traction
• Off-road driving
• Better overall performance
DISADVANTAGES:
• Increased whole structure weight
• Cost is higher
• Sources of vibration and noise increase
19. Awd and 4wd
• Awd: A type of four wheel drive, without a
two speed transfer case, used in vehicles that
are primarily driven on-road. (not off-road)
• 4wd: A vehicle with drive axle at both front
• 4wd: A vehicle with drive axle at both front
and rear, so that all four wheel can be driven;
the drive train usually includes a two-speed
auxiliary transmission, or transfer case.
20.
21.
22. TRANSFER CASE
• A transfer case is a part of the drive train of four-
wheel-drive, all-wheel-drive, and other multiple
powered axle vehicles.
• The transfer case receives power from the
transmission and sends it to both the front and rear
axles.
• It also synchronizes the difference between the rotation
of the front and rear wheels, and may contain one or
more sets of low range gears for off-road use.
23. • This can be done with gears, hydraulics systems, or
chain drive. In some vehicles, such as four-wheel-
drive trucks or heavy duty vehicles intended for off-
road use, this feature is controlled by the driver.
