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Topic: Two wheel drive

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	cars - Four wheel drive
		When a part-time four wheel drive system is enabled, the transfer case connects both the front and rear drive shafts with the transmission.
		The sum of the output angular velocity of the two output shafts (connected to the wheels) is linearly related to the angular velocity of the input shaft (connected to the transfer case).
		When wheel slip is detected, a computer or a hydraulic pump progressively engages a clutch that transfers power to the other pair of wheels; one such car that uses such a system is the Nissan Skyline GT-R, which would otherwise be RWD under casual circumstances.
	www.carluvers.com /cars/Four-wheel_drive (1535 words)

	Two-wheel drive - Wikipedia, the free encyclopedia
		For four-wheeled vehicles, this term is used to describe vehicles that are able to power at most two wheels, referred to as either front or rear-wheel drive.
		For vehicles that have part-time four wheel drive, the term refers to the mode when 4WD is deactivated and power is applied to only two wheels.
		Sidecar drive vehicles are typically mechanically driven via a shaft and may or may not have a differential.
	en.wikipedia.org /wiki/2_wheel_drive (378 words)

	System for controlling two-wheel and four-wheel drives - Patent 4417641
		In conventional four-wheel drive vehicles, a transmission device is adapted to drive either two wheels or four wheels by means of a dog clutch which is manually operated by a select lever.
		Therefore, the present invention provides an apparatus for controlling two-wheel and four-wheel drives which comprises an electromagnetic clutch enabling a change of the engaging state of a transmission with either of two wheels or four wheels by means of a signal, a steering angle sensor, and a control circuit.
		A drive pinion 5a for the front differential device 5 is formed integrally on the front end of the output shaft 6 and is engaged with a ring gear 5b.
	www.freepatentsonline.com /4417641.html (2128 words)

	Howstuffworks "How Four-Wheel Drive Works"
		The benefit of four-wheel drive is easy to understand: If you are driving four wheels instead of two, you've got the potential to double the amount of longitudinal force (the force that makes you go) that the tires apply to the ground.
		When you go around a turn, the inside wheels follow a different path than the outside wheels, and the front wheels follow a different path than the rear wheels, so each of the wheels is spinning at a different speed.
		When four-wheel drive is not engaged, the locking hubs are used to disconnect the front wheels from the front differential, half-shafts (the shafts that connect the differential to the hub) and driveshaft.
	auto.howstuffworks.com /four-wheel-drive.htm/printable (2966 words)

	Four-wheel drive vehicle operating system - Patent 4883138
		Specifically, the differential-locked drive mode is generally used to certainly transmit driving power from the engine to wheels in such a case that, for example, one of traction wheels sticks while the vehicle is running in the differential-free four-wheel drive mode.
		A rear wheel drive shaft or rear output shaft 4R of the transfer case T is coupled to a rear axle shaft 5R through a rear propeller shaft 6R and a rear axle differential gear assembly 7R by which a pair of rear wheels 8R are turned differentially.
		A front wheel in the 4WD indicator 92 is formed an illumination lamp (4WD lamp) 92A and a rear wheel in the Lock indicator 93 is painted as a circle 93B.
	www.freepatentsonline.com /4883138.html (7420 words)

	Luxury cars go off road with all-wheel drive (Site not responding. Last check: 2007-10-08)
		All-wheel drive is the latest to make a leap into a wide spectrum of family cars.
		Makers say all-wheel drive is most popular in snowy areas, but the system also helps in tight turns and emergency maneuvers.
		All-wheel drive had helped the German company set speed records and powered it to the top of the international rally circuit.
	www.post-gazette.com /pg/05259/572879.stm (1997 words)

	Smart Motorist - Four Wheel Drive, All-Wheel Drive, Traction Control (Site not responding. Last check: 2007-10-08)
		In a front-wheel drive system, power from the engine is transferred to the front tires of a vehicle.
		In an all-wheel drive system, power is distributed to all four of the vehicle's tires, all of the time.
		In a four-wheel drive system, power is delivered to all four wheels, only when the driver requests it.
	www.smartmotorist.com /awd/awd.htm (674 words)

	gizmag Article: Yamaha two-wheel drive motorcycle
		The hydraulic pressure transmitted to the front wheel is proportional to the speed of the rear wheel: the more the rear wheel loses traction, the more the hydraulic system compensates by increasing the traction power to the front wheel.
		The front wheel can never turn quicker than the rear wheel, and the power transmitted to the front wheel is never higher than that used for the rear.
		When the throttle is closed, no power is transmitted to the front wheel, but if the throttle is opened abruptly and that the rear wheel starts to lose grip, the sudden increase in pump revs increases the hydraulic pressure of the system and a higher proportion of engine power is transmitted to the front wheel.
	gizmag.com /go/2351 (555 words)

	Two Wheel Drive, Albuquerque New Mexico's Bicycle Specialists. Located in the University(UNM) area, Albuquerque NM. We ...
		This was so because when the engineers went to work, it was the recumbent design, which is 25 to 33% more aerodynamically efficient than a conventional upright bicycle, that satisfied their equations for a two wheeler that could produce such speed.
		Soon, in 1986, a recumbent bicycle ridden by Fast Freddy Markham captured the Dupont prize and it was his victory that gave a shot of adrenaline to the fledgling industry that Ryan had helped to revitalize.
		In fact the lower center of gravity and greater proximity to the ground mean that if you should crash on one, your feet will absorb most of the shock instead of your head.
	www.swcp.com /bicycles/twowheeldrive.com/whyRecumbents.htm (605 words)

	Drive wheel - Wikipedia, the free encyclopedia
		A drive wheel is a wheel in an automotive vehicle that receives power from the powertrain, and provides the final driving force for a vehicle.
		A two-wheel drive vehicle has two driven wheels, and a four-wheel drive has four.
		A trailer wheel is one that is neither a drive wheel nor a steer wheel.
	en.wikipedia.org /wiki/Drive_wheel (142 words)

	Introduction to All Wheel Drive systems
		A permanently engaged four wheel drive system needs to have three differentials to enable it to apply power to four wheels and be able to turn without resistance: The front, rear and center diffs.
		An all wheel drive system is always engaged and is actually simpler because it eliminates the need of these convenience "features" and their associated parts, which are the usual source of problems.
		When four wheel drive is not engaged, which is typically the majority of the time, one is left with a hopelessly understeery vehicle, because the front still assumes a rear end that has to scrub off excess speed.
	home.comcast.net /~eliot_www/awd.html (6007 words)

	Four-Wheel Drive Tire Pressure, Axle Control & Glossary - Truck Trend
		Where four-wheel drive is mentioned hereafter, much of the information will apply to all-wheel drive as well (keep in mind gearing is where we make the distinction).
		In vehicles derived from front drives, many are front drive normally and add rear drive as required: The amount of output transferred to the rear is often a function of strength--the Saturn VUE four-cylinder can direct 69-percent power to the rear, while the V-6 sends a maximum of 57 percent.
		As the speed varies between the two sets of plates, because one driveshaft is rotating faster than the other (either by turning or by wheels slipping), the silicone reacts to the heat being generated by thickening, which in turn starts to limit the speed differential between the two sides of the VCU.
	www.trucktrend.com /features/tech/163_0206_four_wheel_drive (1747 words)

	Some of the Fastest, Best Handling Off Road Trucks are Two-Wheel Drive - 4 Wheel and Offroad Magazine
		Now, you can ruin your two-by and turn it into a belly dragging barrio cruiser that gets hung up on speed bumps with groceries in the bed, or you can do the right thing and try to get a little performance and lift out of the suspension.
		Since two-wheel drives don’t have transfer cases, front differentials, or front driveshafts to lower or worry about, the lift kits tend to be less bracket-happy.
		These beams provide gobs of wheel travel and up to 8 inches of lift when all of the corresponding parts are used.
	www.4wheeloffroad.com /techarticles/two_wheel_drive_trucks (3159 words)

	Subaru \| All Wheel Drive \| Active Drive Content (Site not responding. Last check: 2007-10-08)
		Other two-wheel drive cars equipped with traction control can't offer the same level of vehicle control in hazardous driving conditions as Subaru All-Wheel Drive.
		Subaru placed two high-strength steel pipe beams in the front door and steel replacement in the shoulder section to improve side-impact protection in the new Legacy and Outback models.
		These side-impact beams tie in with a strengthened rear wheel arch to reduce the possibility of a side-impact intrusion.
	www.subaru.com /allwheeldrive/active_drive_middle.html (936 words)

	Dirt Bike News - KTM's Two-Wheel Drive Dirt Bike - Dirt Rider Magazine
		When you are riding very slowly, for example at the Erzberg, where it's seriously up and down over rough ground, the rear wheel often breaks traction and spins - but not with the 2-wheel drive, which keeps on pulling with the front wheel.
		With 2-wheel drive one simply twists the throttle and the bike accelerates because the power is distributed to both wheels.
		You must get used to the fact that the front wheel is also always driving, that you should always take a wider curve radius, and that you'll be amazed when the front wheel pulls you out of a rocky section.
	www.dirtrider.com /news/141_0406_two_wheel_drive_dirtbike/index.html (671 words)

	CanadianDriver: Auto Tech - Understanding different four-wheel-drive systems
		Some use a lever to shift between two wheel drive (2wd) and four wheel drive, while other manufacturers may use a switch and electric motor or vacuum actuator to shift modes.
		Continue to drive with the driveline binding and soon the axles or transfer case can be destroyed.
		Honda's CRV is typical of one type where the front wheels have to slip before the rear wheels are engaged.
	www.canadiandriver.com /articles/jk/040414.htm (800 words)

	2 Wheel Drive Modified Rules (Site not responding. Last check: 2007-10-08)
		133” wheel base but the wheels must be inside the original fender well location.
		shorter than 30% of 133” wheel base or 40” from center of rear axle to hitch point.
		Wheels must be a minimum of 6” round by 2” wide and
	www.newlandpullers.com /Rules3.html (410 words)

	Inside Line: What Wheel Drive? - (Site not responding. Last check: 2007-10-08)
		This layout is also more challenging to drive in inclement weather where, without the aid of traction control, a RWD car can more easily end up on somebody's front lawn or stuck in a ditch.
		These systems were not very advanced in that they simply put power to all four wheels, usually after an interior shift lever was moved and/or the vehicle's hubs were manually "locked" by the operator.
		The "all" part of all-wheel drive is a bit misleading since the majority of AWD vehicles use the front wheels primarily and only direct power to the rear wheels when a sensor detects front-wheel slip.
	www.edmunds.com /insideline/do/Features/articleId=43847 (1228 words)

	CA Dep. Consumer Affairs- Bur. Automotive Repair - All Wheel Vehicles
		Vehicles which use all-wheel drive or traction control may not be clearly marked.
		Continuous four-wheel drive systems on 1974-1979 Dodge pickups and Ramcharger cannot be disengaged unless vehicle is equipped with an aftermarket part-time retrofit kit.
		Continuous four-wheel drive system on 1974-1979 Plymouth Trailduster cannot be disengaged unless vehicle is equipped with an aftermarket part-time retrofit kit.
	www.smogcheck.ca.gov /StdPage.asp?Body=/Geninfo/Otherinfo/AllWheel.htm (933 words)

	Page 2 - Two Wheel Drive Patent (Site not responding. Last check: 2007-10-08)
		wheel drive system, but that they may be a trifle
		drive setup; it's not at all clear how that would work.
		hp is being sent to the rear wheel.
	www.cyclingforums.com /t-103783-15-2.html (1299 words)

	Pickup Truck Buyer's Guide - Drive Type (Site not responding. Last check: 2007-10-08)
		It also provides good drive traction, since the weight of the powertrain is carried primarily by the driving wheels.
		Most pickup trucks use a part-time 4x4 system that sends power only to the rear wheels in normal operation when 4-wheel drive is not engaged.
		Having the ability to drive all four wheels improves traction on slippery or off-road conditions.
	www.gmcanada.com /english/truckguide/pick_drive.html (495 words)

	Yamaha WR450F 2-Trac - Review
		In simple terms the two wheel drive system can be explained as follows: The gearbox output sprocket drives a short, fully enclosed chain to a pump, which in turn pushes the oil (not hydraulic fluid) to the front hub via the pipe and back via the parallel pipe.
		There's no drive at all until the rear wheel starts to spin and only a maximum of 15% of the power goes to the front at any time.
		The two wheel drive does inspire confidence though, especially in soft sand and it does make a real difference, as I discovered when I swapped back to the rear wheel drive bike.
	www.mcnews.com.au /Testing/Yamaha/WR-2trac/Page1.htm (547 words)

	Motorcycle Daily
		The benefits for the road are similar to those found in the dirt, i.e., improved traction everywhere together with more confidence/control while cornering.
		Yamaha would likely be the first manufacturer to make two-wheel drive available for the road.
		No part of this service may be reproduced, reprinted or republished in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise without written permission from Motorcycle Daily, LLC.
	www.motorcycledaily.com /28march05_2wheel.htm (160 words)

	Visteon Corporation: All-Wheel Drive System
		An All-Wheel Drive vehicle has a driveline that delivers, or has the capability to deliver, tractive torque to all four wheels.
		Part-time All-Wheel Drive systems enable a two-wheel drive vehicle to drive with all four wheels when the driver selects the option.
		Full-time All-Wheel Drive systems deliver torque to all four wheels continuously.
	www.visteon.com /products/automotive/allwheel_drive.shtml (63 words)

	4WD vs 2WD: The Differences Between 4x4 And 4x2 (via CobWeb/3.1 planetlab1.tamu.edu) (Site not responding. Last check: 2007-10-08)
		The common assumption is that 4x4 means all four wheels are driven at the same time.
		So, if one wheel is on a slippery surface (like ice) then all the energy will be sent to that wheel and away from the wheel with traction.
		When four-wheel drive mode is engaged, the front and rear axles are locked together, so at least one wheel on each axle can be driven by the engine effectively.
	4wheeldrive.about.com.cob-web.org:8888 /library/weekly/aa021401a.htm (779 words)

	Columbia Missourian - Two-wheel drive (Site not responding. Last check: 2007-10-08)
		“When you go to college, you’ll be wheeling around one of those things instead of walking,” said tailgater Denise Thurman to her 8-year-old son and his friend.
		MU’s athletic department bought two Segways to reduce the time spent walking or driving from one athletic facility to another.
		It is comparable to driving a bike for the first time, in which the easiest way to learn is through hands-on experience.
	columbiamissourian.com /news/story.php?ID=16419 (615 words)

	Bicycle inventor has the last laugh - Billie Joe Becoat invents two-wheel drive bicycle and secures patent in 32 ... (Site not responding. Last check: 2007-10-08)
		The bike, which looks like a typical mountain bike, consists of an extra ring gear on the back wheel and a sheathed rotating cable that connects to another gear on the front wheel.
		By shifting power from the back wheel to the front wheel, the new bike, Becoat says, provides better traction and handling on slippery surfaces and rough terrain.
		Steering is easier on turns because the front wheels won't slide on sharp turns.
	www.findarticles.com /p/articles/mi_m1077/is_n8_v48/ai_13923138 (886 words)

	TWO-WHEEL DRIVE SPECIALTY BICYCLE (Site not responding. Last check: 2007-10-08)
		This new alternative bicycle technology is comparable to a four-wheel drive automobile, in that each of its wheels is provided with power.
		The bike is equipped with one or two additional brakes for increased safety.
		As one becomes familiar with such conventional biking, it is possible to shift, as desired, to the new skill and either all-wheel (hand and foot) or front-wheel (hands only) propulsion.
	www.people.cornell.edu /pages/jv19 (141 words)

	Ford Explorer Two Wheel Drive to Four Wheel Drive Conversion
		The most important part about a 4x4 conversion is having all of the parts you need to do the conversion.
		It is a good Idea to have two people work on this conversion.
		I placed the Explorer on four Jack stands two at the rear end and two at the radius arm cross member.
	www.explorer4x4.com /2wdto4wd.html (482 words)

	KTM Reviewing 2-Wheel Drive
		Hoping to keep on top of what may be the next major breakthrough in motorcycle design, KTM says it also is now working with a two-wheel-drive system.
		"What we're testing at the moment is a mechanical hydraulic system with a pre-set torque distribution between the front and rear wheel," Project Leader Wolfgang Felber explained in a prepared statement.
		But if someone has problems with steep climbs or often gets bogged down, then I think 2-wheel drive will yield great rewards.
	gotgearmotorsports.com /news_article.asp?id=2019 (333 words)

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