A four-wheel drive vehicle
existed since 1899. Like any technology that we have right now, this
kind of vehicle has undergone series of transformation until it has
adapted the looks of the modern day cars. Most of these vehicles
serve well in the military but because of technology, passenger
vehicles were able to adapt this system. Although the first car of
this kind was generally used as transportation to the moon, it has
paved way to various improvements that worked well for ordinary
folks in our time.
There are many advantages of using a four-wheel drive. From the word
itself, the benefits of using such vehicle is attributed to the
wheels, as they become the focal point in this feature. However,
most of the automobiles adapting this kind of mechanism perform
better because of the other features that compliment the performance
of the wheels. The following are the reasons why 4WDs are of great
advantage:
1. This kind of vehicle avoids wheel slip. In any kind of road,
(whether muddy or icy) you will have the great traction to keep you
in control with your vehicle. You cannot get this kind of advantage
from the usual cars. Although traction can also be found on 2WDs,
however they are not as better as what you get from 4-wheel
vehicles.
2. Using this vehicle would also mean more control on rough trails.
If you use mainstream cars, you will definitely stop in the middle
of your driving spree. If you want to keep on moving despite how
rough the road will be, this is your solution. However, you need to
have accessories like tuff country lift kits to improve the
performance in difficult roads. They can be a great help to you in
maneuvering your car especially when you engage in off-road
adventure.
3. In cases of emergency, this kind of vehicle can help you in
towing. Due to the enhanced traction, towing should not be a
problem. If in any case another family member will have engine
problems while on the road, you do not to pay towing services just
to help them. You can go down and get them yourselves. All you need
is a bunch of ropes or cables and you will be off to save the day.
4. Having a four-wheel drive vehicle helps ordinary folks to make
everyday driving safe for their family. Many people no car can avoid
the dangers of the road; not even a 4WD. However most automobiles
with this kind have adapted special features like ABS (Anti-Lock
Braking system) and other safety features that could be the possible
reason most of them are a little expensive compared to 2WDs.
5. They are good for safe off-road adventure, which many outdoor
enthusiasts love. Some of the vehicles using this kind of feature
are mostly trucks and SUVs. With their safety features and the
accessories that you add like tuff country lift kits, makes the
performance of these vehicles even better.
Despite the many criticisms of four-wheel Drives, many people still
buy them. That is why before you opt to buy them check out the other
features that could compliment the performance. This way, you will
be able to have a safe ride everyday.
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The term four-wheel drive
The term four-wheel drive typically describes larger passenger
vehicles that may allow the driver to manually switch (sometimes
with an automatic option) between two-wheel drive mode (if
available) for streets and four-wheel drive mode for low-traction
conditions such as ice, mud, snow, or loose gravel.
All-wheel drive (AWD) is often used to describe a "full time" 4WD
that may be used on dry pavement without damaging the differentials,
although the term may be abused when marketing a
vehicle[2][non-primary source needed] as there are no specific
definitions or guidelines (per the SAE for example) to differentiate
these terms.[3] AWD can be used on dry pavement because it employs a
center differential, which allows each axle to rotate at a different
speed. This eliminates driveline binding, wheel hop, and other
driveline issues associated with the use of 4WD on dry pavement. For
vehicles with more than four wheels, AWD means all wheels drive the
vehicle, to varying degrees of engagement, while 4WD means only four
of the wheels drive the vehicle continuously. For example, an AWD
vehicle with six wheels is often described as a 6×6, the M35 2½ ton
cargo truck being one of the best-known examples (dual wheels on the
rear axles are not counted as additional drive wheels).
Because all 4 tires in a full time AWD system are connected by a
system of differentials, they are potentially very susceptible to
torque reduction when a wheel loses traction. Without sophisticated
traction control systems, they would become immobilized when any one
of the four tires lost traction. A traditional part time 4WD system
does not connect the front and rear via a differential, and
therefore does not suffer any front/rear torque reduction—if a front
tire loses traction, it does not reduce torque delivered to the rear
tires, even without traction control systems.
Part-time 4WD systems are mechanically simpler and cheaper than AWD
systems. Also, a part-time 4WD transfer case is usually equipped
with a reduction gear setting that provides for higher torque at
lower speeds, a vital feature for vehicles that will see much
off-road use. In AWD systems a more expensive separate reduction
gearbox is usually used. The main drawback of 4WD is that because it
lacks a center differential, a part-time 4WD system can only be used
in low traction situations where the wheels have the ability to slip
as needed.
For these reasons, full-time AWD is appropriate for improving
on-road handling and is seen on cars and car-based crossover SUVs,
while traditional part-time 4WD systems without center
differentials, or with locking center differentials, are better for
heavy-duty use such as off-road or in deep snow and are commonly
seen on trucks and truck-based SUVs.
Manufacturers often use these terms interchangeably, and the English
word all is obviously equivalent to the word four when referring to
a set of four wheels. In typical use, the terms are used as
described above, but they are not fixed or legal definitions, and
some manufacturers, such as Honda, often use the term "four wheel
drive" when referring to systems that include center differentials.
These terms are therefore not always very reliable for assessing the
features and capabilities of a given drivetrain.
Identical drivetrain systems are commonly marketed under different
names for upmarket and downmarket branding and, conversely,
different drivetrain systems are commonly marketed under the same
name for brand uniformity. Audi's quattro, Mercedes-Benz's 4Matic,
BMW with the xDrive, Saab's XWD, and Volkswagen's 4motion, for
example, can mean either an automatically engaging "on-demand"
system with Borg-Warner ITM 3e magnetic or Haldex Traction hydraulic
clutch, or a continuously-operating permanent 4WD system with a
Torsen (torque-sensing) or other type of a differential. |
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