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Topic: Four-wheel drive


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In the News (Thu 18 Jul 19)

  
 Front-wheel drive - Wikipedia, the free encyclopedia
All Subaru front wheel drive and all wheel drive layouts are derived from the standard longitudinal front engine/rear drive transmission configuration, however the differential for the front wheels is between the bellhousing and the transmission.
Transversly mounted engine and front wheel drive was introduced with the 1949 Saab 92 and popularised by the Mini of 1959, there the transmission was built into the sump of the engine, and drive was transferred to it via a set of primary gears.
Front wheel drive was further advanced by the 1948 Citro├źn 2CV (a Porsche 911 boxer exactly reversed in layout).
en.wikipedia.org /wiki/Front_wheel_drive   (1752 words)

  
 Four wheel drive - Wikipedia, the free encyclopedia
Four wheel drive (4WD or 4x4 for short) was the original term, often used to describe truck -like vehicles that required the driver to manually switch between a two wheel drive mode for streets and a four wheel drive mode for low traction conditions such as ice, mud, or loose gravel.
Four wheel drive, 4WD, 4x4, all wheel drive, and AWD are terms used to describe a four-wheeled vehicle with a drivetrain that allows all four wheels to receive power from the engine simultaneously.
The "all wheel drive" term (AWD for short) was invented to distinguish vehicles that are capable of driving all four wheels on normal roads without causing poor control and excessive tire and drivetrain wear.
en.wikipedia.org /wiki/Four_wheel_drive   (1752 words)

  
 Rear-wheel drive - Wikipedia, the free encyclopedia
It should be mentioned that front wheel drive and four wheel drive cars may also drift, but only with much more difficulty.
Rear wheel drive has fallen out of favor in passenger cars since the 1980s, due in part to higher manufacturing costs, and a perception by many car buyers that front wheel drive is safer, and that it performs better on slippery roads.
Rear-wheel drive (or RWD for short) was a common engine/transmission layout used in automobiles throughout the 20th century.
en.wikipedia.org /wiki/rear_wheel_drive   (906 words)

  
 Four-wheel drive - Wikipedia, the free encyclopedia
Four-wheel drive (4WD or 4x4 for short) was the original term, often used to describe truck-like vehicles that required the driver to manually switch between a two wheel drive mode for streets and a four-wheel drive mode for low traction conditions such as ice, mud, or loose gravel.
Four-wheel drive, 4WD, 4x4 ("four by four"), all wheel drive, and AWD are terms used to describe a four-wheeled vehicle with a drivetrain that allows all four wheels to receive power from the engine simultaneously.
The "all wheel drive" term (AWD for short) was invented to distinguish vehicles that are capable of driving all four wheels on normal roads without causing poor control and excessive tire and drivetrain wear.
en.wikipedia.org /wiki/Four_wheel_drive   (2760 words)

  
 Six-wheel-drive - Wikipedia, the free encyclopedia
Most 6WD/6x6 vehicles have two wheels at the front and four at the rear and require the driver to manually switch between drive to the four rear wheels for on road and all-six for off-road.
Six wheel drive, 6WD, and 6x6 are terms used to describe a six-wheeled vehicle with a drivetrain that allows all six wheels to receive power from the engine simultaneously.
This page was last modified 07:55, 5 February 2006.
en.wikipedia.org /wiki/Six-wheel-drive   (133 words)

  
 FRONT WHEEL DRIVE CYCLE (US3848891)
drive means having a first drive linkage drivably connecting the front wheel with the forward portion of the tiller means and a second drive linkage connecting the first drive linkage and the rear portion of the tiller means, and means for imparting torque to the rear portion of the second drive linkage.
A drive train has a first drive linkage operably connected to front wheel means for rotation of the front wheel upon actuation of the drive train.
A manually powered front wheel drive cycle particularly adaptable for use by paraplegic individuals.
www.delphion.com /details?pn=US03848891__   (343 words)

  
 World Intellectual Property Organization
An alternative drive assembly for transfer of the power from the rear wheel to the main shaft involves the extension of the drive shaft directly to the rear wheel assembly wherein the pinion gear at the end of the drive shaft meshes with a bevel gear mounted circumferentially on the rear drive gears.
The rear drive sprockets 22 are mounted on the rear wheel 90 at the rear wheel hub 89 which is rotationally mounted on the rear axle 64 between the right rear dropout 7 and left rear dropout 8.
Additionally, the rear wheel bevel gear 37 is mounted on the low gear side of the rear drive sprockets 22 at a close clearance distance to the rear end of the straight main drive tube 86 of the bicycle 79.
www.wipo.int /ipdl/IPDL-CIMAGES/view/pct/getbykey5?KEY=97/41024.030904&ELEMENT_SET=DECL   (343 words)

  
 Patent 4037429: Adapter unit for converting a two-wheel drive vehicle to a four-wheel drive vehicle
For negotiating such areas, it is desirable to have four-wheel drive capability as four-wheel drive vehicles are ideally suited for traveling off road over rough, hilly country.
Two power outputs extend from the housing, one delivering power to the drive shaft 18 leading to the rear wheels 20 and one delivering power to the drive shaft 30 leading to the forward wheels 26.
The drive shaft 49 is in perfect alignment with the power output shaft of the transmission and is aligned such that the gear adequately meshes with the gears of the power transfer unit for adequate driving thereof.
www.freepatentsonline.com /4037429.html   (343 words)

  
 Front wheel drive, rear wheel drive or all wheel drive? - Page 2 - Ultimatecarpage.com forums
All wheel drive has its place but is somewhat of a marketing gimmick made popular by the success of the Subaru WRX which I think had as much to do with the entire package as it did with the fact that it is all whell drive.
All wheel drive is great for rainy and snowy conditions, but i feel it is too safe and the driver loses the pleasure and thrill of driving.
front wheel drive is safer for the average driver, rear wheel for enthusiasts, all wheel drive for massive horsepower.
www.ultimatecarpage.com /forum/showthread.php?p=34438   (2358 words)

  
 FR layout - Wikipedia, the free encyclopedia
Placing the drive wheels at the rear allows ample room for the transmission in the center of the vehicle and avoids the mechanical problems of transmitting drive to steered wheels.
In Automobile design, an FR, or Front-engine, Rear wheel drive means a layout where the engine is in the front of the vehicle and drive wheels at the rear.
Many of the newest models have adopted all wheel drive, and some, like the Chrysler 300 are switching back to the FR layout.
en.wikipedia.org /wiki/FR_layout   (504 words)

  
 Benefits of Rear Wheel Drive
Since the driveline is connected to the steering wheels the torque of the engine applies force to the front wheels causing the car to pull to the right during acceleration.
The better weight balance of rear wheel drive allows the car to handle better.
Rear Drive cars do not have this problem since the engine is not connected to the steering gear.
www.rearwheeldrive.org /rwd/rwdbenefits.htm   (1132 words)

  
 Front-wheel drive
Australian National Four Wheel Drive Council A voluntary organization and peak body for four wheel drive associations in Australia.
All Wheel Drives All wheel and four wheel drive specialists.
Finishing Touch 4-wheel Drive Center Automotive service, installation, parts, and accessories for four wheel drive vehicles.
www.serebella.com /encyclopedia/article-Front-wheel_drive.html   (371 words)

  
 Two wheel drive - Wikipedia, the free encyclopedia
A two-wheel drive configuration has only two wheels-- either the front two or the back two-- providing propulsion.
This page was last modified 13:20, 25 May 2005.
en.wikipedia.org /wiki/2_wheel_drive   (371 words)

  
 Four Wheel Drive Glossary
Second, when shifting from two- to four-wheel drive "on the fly" (while moving), the front axle disconnect couples the front axle to the front differential side gear only when the transfer case's synchronizing mechanism has spun the front driveshaft up to the same speed as the rear driveshaft.
Automatic-locking hubs automatically engage, or "lock," the hub and tire and wheel assembly to the front drive axle's axle shaft when the operator engages a four-wheel drive mode.
When one wheel is slipping, both types use the separating force generated by the specially-designed differential pinion gears, combined with the static load, to bypass the pinion gears and transfer a greater proportion of power directly from the ring gear to both axle shafts.
www.4crawler.com /4x4/Glossary.shtml   (371 words)

  
 Two-Wheel Drive(View)
Two California inventors have begun marketing what they call the world's first "sport utility bicycle." The Xtracycle is a retrofitted frame extender that fits over the back of your bike and allows you to lug as much as 200 pounds of otherwise unwieldy cargo (surfboards, fish tanks, kayaks, six bags of groceries).
www.utne.com /pub/2000_103/view/1751-1.html   (371 words)

  
 ChiefDelphi Forums - 2-wheel versus 4-wheel drive
If you begin to push something such that the two driven wheels are away from the object your pushing, you might end up with all 130 lb on the two drive wheels giving you 130 lb of pushing force.
Two wheel is very effective with tracks (only power two of the wheels in the tracks) and wide wheels.
I am a BIG fan of 3 wheels on a side with the middle wheels lower (1/4 to 1/2 inch depending on a number of factors including the flex in the tires you are using).
www.chiefdelphi.com /forums/showthread.php?t=2177   (371 words)

  
 Hemmings Motor News Magazine Article - November 2004
Driving a Pinzgauer takes a bit of practice and patience, You learn to drive it as a four-speed -- first is totally unnecessary until climbing a steep hill -- and you learn that 55 mph is an O.K. top speed -- it's easier to see the bewildered faces people make when you drive by.
The coil sprung suspension and stock-size wheels and tires provide 45 degree approach and departure angles, enough to scale any obstacles we came across on a near by trail cut for access to a fire tower.
Jason said he drives his Pinzgauer, a 712M, every day he can't ride his motorcycle, and only laments the lack of a radio in everyday driving.
www.northeastoffroad.com /hemmings2.htm   (1195 words)

  
 Alvis Stalwart Six Wheel Drive
From here drive is taken out sideways to the centre wheel bevel boxes, then on to the front and rear wheel pairs by further side mounted prop-shafts.
Manoeuverability in water is good, steering being achieved by a combination of vectored thrust from the PTO driven twin Dowty water-jet propulsion units, and the road wheels.
Drive is taken forward through a 12 inch Borg and Beck clutch, to the 5-speed primary gearbox, which incorporates PTO's for winch and marine drive.
www.4wdonline.com /Mil/Alvis/Stalwart.html   (1267 words)

  
 CanadianDriver: Auto Tech - Rear wheel drive is back!
With front wheel drive cars, the majority of cornering traction and all acceleration traction must be carried by the front tires.
When a mechanical problem develops in the driveline of a rear wheel drive vehicle, the labour it takes to remove and install components is usually much less because of easier mechanical access.
Putting the weight over the drive wheels in front wheel drive cars makes a lot of sense but there is more to traction than straight-line performance.
www.canadiandriver.com /articles/jk/040331.htm   (772 words)

  
 Cadillac's Rear-Wheel-Drive Technology - AmericanCarFans.com
When the system senses impending wheel slip during acceleration, it signals the electronic throttle control to reduce drive wheel torque, which the system accomplishes smoothly and seamlessly.
Establishing RWD as the primary drive configuration was the essential enabler for this transition.
While RWD vehicles have always been superior performers on dry, high-coefficient of friction surfaces, low-coefficient tests of these new Cadillacs equipped with advanced chassis controls and tire technologies have demonstrated their ability to operate safely and confidently under all types of adverse weather conditions, including on wet, snow-covered or icy road surfaces.
www.americancarfans.com /print.cfm?ID=2050131.004   (1216 words)

  
 CanadianDriver: Front wheel drive vs rear wheel drive
We used to have predominately rear wheel drive (RWD) automobiles on the road, but by the late 1970's, front wheel drive (FWD) vehicles were beginning to dominate.
Independent rear suspension, used on many current RWD cars allows the engineers to position the body closer to the differential and driveshaft, so interior room has improved.
Rear tire traction is decreased and the car may swap ends on icy roads easier.
www.canadiandriver.com /articles/jk/020619.htm   (807 words)

  
 Rear vs Front Wheel Drive in Winter
Bob Erck ===================================================== In principle, four wheel drive is superior because power reaches all four wheels independently and the electronics allow each wheel to "recognize" the traction of the other three.
Front wheel drive is considered next best because the "weight" of the engine is over the wheels doing the steering.
Rear wheel drive without added weight is considered to be the least effective.
www.newton.dep.anl.gov /askasci/eng99/eng99328.htm   (377 words)

  
 Front Wheel Drive - Is it practical?
Front wheel drive means that you are going to use the front wheel to propel the bike as well as steer it.
One is to build a bike that looks like a SWB with the bottom bracket (BB) out in front connected to the main frame, but instead of routing the chain to the rear wheel it goes to the front wheel.
A far simpler way of building a FWD bike is to mount the bottom bracket in front of the front wheel but have it attached to the fork instead of to the frame.
traylorfwd.home.mindspring.com /fwd.html   (828 words)

  
 Back Room: Front wheel drive is dangerous!
The guy who stated in the Telegraph that RWD was inherently safer than rear wheel drive quoted several examples "have you ever seen a front wheel drive bicycle, a rocket with the jet on the front, a speedboat with the propellor at the front" or words to that effect.
And actually I think the penny f***hing had "front wheel drive" and the reason you don't put the jet on the front of rocket is obvious, as is the speedboat thing.
Front or reear wheel drive just changes the way the car behaves in response to throttle input as you appraoch the limit.
www.honestjohn.co.uk /forum/post?t=13634   (6018 words)

  
 CanadianDriver: Front wheel drive vs rear wheel drive
We used to have predominately rear wheel drive (RWD) automobiles on the road, but by the late 1970's, front wheel drive (FWD) vehicles were beginning to dominate.
With some of the mechanical parts removed from the front and installed at the rear, vehicle balance and handling are much improved.
The disadvantages of FWD are mainly the decrease in vehicle handling ability.
www.canadiandriver.com /articles/jk/020619.htm   (807 words)

  
 front wheel drive car good in snow - Topic
The difference I have noticed between a rear wheel drive and front wheel drive is with rear wheel, the rear end tends to fish tail on you.
The only advantage that front wheel drive offers is that the majority of the car's weight is over the driven wheels therefore providing more traction.
They have a front wheel drive version, and all wheel drive version, and a front wheel drive with a high performance engine, (Celica engine), with 6 speed transmission.
answerpool.com /eve/ubb.x/a/tpc/f/526604891/m/2936070645   (367 words)

  
 Front wheel drive and fluid suspension
His bold concept of front wheel drive and fluid suspension, were unheard of at the time.
By comparison with front engine and rear driven cars, adhesion on the driven wheels is improved in that they carry considerably more than half the laden weight.
These different leverages were chosen to accommodate the heavier front load of the ADO 17, at the same time using common units front and rear.
austin1800.homestead.com /Page7.html   (1572 words)

  
 Front Wheel Drive Car
For wheels to operate properly, the center of the wheel must be attached to the body.
Wheels must be attached to the body, yet allowed to rotate.
Click on the right wheel and type in the same number as the left wheel for the y position.
www.pblunit10.com /rmorrison/front_wheel_drive_car.htm   (836 words)

  
 FRONT WHEEL DRIVE CAN GET YOU KILLED
Front Wheel Drive vehicles, although they have been in production in various parts of the world for most of this century, first came to America in any kind of quantity with the advent of the Austin/Morris Mini, first introduced here around 1959.
The slight braking of the rear wheels will bring on some slewing around of the rear of the car, and the braking of the front wheels will be offset by the power applied to them at the same time.
You may have been driving it for years without any problem, not knowing that when and if you encounter a condition of front-end skid, or fwd understeer, you life may well depend on knowing what to do, and most importantly,that you don't want to do what was correct with Rear Wheel Drive.
www.angelfire.com /biz/snwvlly/fwd.htm   (2433 words)

  
 Front wheel drive bike with hub gear
A problem with front wheel drive bikes is the fact that pressure on the pedals also exerts a steering effect.
If the seat were positioned over the front wheel, then the chain would have to be led back from the pedals, over an idler pulley and then down along the side of the fork.
An idler pulley on the tension side of a chain drive is generally undesirable because it significantly increases energy loss compared with an idler on the non-tension side.
web.uct.ac.za /depts/psychology/bok/fwd.html   (1673 words)

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