- Front-wheel drive
Front-wheel drive (or
FF layout) is a form of engine/transmission layout used in motor vehicles, where the engine drives the front wheels only. Most modern front-wheel drive vehicles feature a transverse engine, rather than the conventional longitudinal enginearrangement generally found in rear-wheel driveand four-wheel drivevehicles.
According to various sources, sometime between 1895 and 1898
Gräf & Stiftbuilt a " voiturette" with a one-cylinder De Dion-Boutonengine fitted in the front of the vehicle, powering the front axle. It was thus arguably the world's first front-wheel drive automobile, but it never saw mass production, with only one copy ever made.
1900 - 1920
Experiments with front-wheel drive cars date to the early days of the
automobile. Following the Spanish-American War, J. Walter Christieof the USA was working on designs for a front-wheel drive car, which he promoted and demonstrated by racing at various speedways in the U.S., and even competed in the Vanderbilt Cupand the French Grand Prix. In 1912 he began manufacturing a line of wheeled fire engine tractors which used his front-wheel drive system, but due to lack of sales this venture failed.
1920 - 1930
The first successful application of front-wheel drive was the Miller 122 racecar designed in 1924 by
Harry Arminius Millerof Menomonie, Wisconsin. However, the idea languished outside of the motor racing arena as no major auto manufacturer attempted the same for production automobiles. Market experiments in the United States were left to small endeavors such as the Ruxton (200 cars in 1929), and the Cord L-29 of 1929. Neither automobile maker was particularly successful on the open market. Alvis Carsof the United Kingdomalso introduced a front-wheel drive model in 1928, but it was not a success either.
1930 - 1945
The first successful consumer application came in 1931 with the
DKWF1 from Germany. Other German car producers followed: Stoeweroffered a car with front wheel drive in 1931, Adler in 1932 and Audiin 1933. In 1934, the very successful Traction Avant cars were introduced by Citroënof France. BSA three-wheelers of the United Kingdomwere also popular front-wheel drive automobiles, and the Cord 810 of the United States managed a bit better in the late 1930s than its predecessor one decade earlier. These vehicles featured a layout that places the engine behind the transmission, running "backwards," (save for the Cord, which drove the transmission from the front of the engine). The basic front-wheel drive layout provides sharp turning, and better weight distribution creates "positive handling characteristics" due to its low polar inertiaand relatively favourable weight distribution. (The heaviest component is near the centre of the car, making the main component of its moment of inertiarelatively low). Another result of this design is a lengthened chassis.
1945 - 1960
Front-wheel drive was further popularized by the 1948
Citroën 2CV,Fact|date=February 2007 where the air-cooledlightweight aluminium flat twinengine was mounted ahead of the front wheels, but used Hookes type universal jointdriveshaft joints, and 1955 Citroën DS, featuring the mid-engine layout. Panhardof France, DKWof Germany and Saab of Sweden offered exclusively front-wheel drive cars, starting with the 1948 Saab 92.
In 1954, Alfa-Romeo had experimented with its first front-wheel drive compact car named "33" (not related or referred to sports car similarly named "33"). It had the same transverse-mounted, forward-motor layout as the modern front-wheel drive automobiles. It even resembled the smaller version of its popular
Alfa-Romeo Guilia. However, due to the financial difficulties in post-war Italy, the 33 never saw the production. Had Alfa-Romeo succeed in producing 33, it would precede the Mini as the first "modern" front-wheel drive compact car.
Austin Miniwas launched by the British Motor Corporation, designed by Alec Issigonisas a response to the first 'oil crisis', the 1956 Suez Crisis, and the boom in bubble carsthat followed. It was the first production front wheel drive car with a watercooledinline four cylinder engine mounted transversely. This allowed eighty percent of the floor plan for the use of passengers and luggage. The majority of modern cars use this configuration. Its progressive rate rubber sprung independent suspension ( Hydrolastic1964-1971), low centre of gravity, and wheel at each corner with radial tyres, gave a massive increase in grip and handling over all but the most expensive cars on the market. It used GKNdesigned Constant-velocity jointdrive shaft universal joints.
1960 - 1975
The transversely mounted engine combined with front-wheel drive was popularized by the 1959
Mini;Fact|date=February 2007 there the transmission was built into the sumpof the engine, and drive was transferred to it via a set of primary gears. The same transmission concept was also used by Peugeotand Renaulton their jointly-developed small car engine of the 1970s where the 4-cylinder block was canted over to reduce the overall height of the engine with the transmission underneath ( PSA X engine). The tendency of this layout to generate unwanted transmission "whine" has seen it fall out of favour. Also, clutch changes required engine removal.
Triumph 1300was designed around a longitudinal engine with the transmission underneath. Audihas also used a longitudinally mounted engine overhung over the front wheels since the 1970s. Audi is one of the few manufacturers which still uses this particular configuration. It allows the use of equal-length half shafts and the easy addition of all-wheel drive, but has the disadvantage that it makes it difficult to achieve 50/50 weight distribution (although they remedy this in four-wheel drive models by mounting the gearbox at the rear of the transaxle.)
Also in the 1970s and 1980s, the
Douvrin engines used in the larger Renaults (20, 21, 25 and 30) used this longitudinal "forward" layout. The first generation Saab 900, launched in 1978, also used a longitudinal engine with a transmission underneath with helical gears. The 1966 Oldsmobile Toronadowas the first U.S. front-wheel drive car since the Cord 810. It used a longitudinal engine placement for its V8, coupled with an unusual "split" transmission, which turned the engine power 180 degrees. Power then went to a differential mounted to the transmission case, from which half-shafts took it to the wheels. The driveline was set fairly at centre-point of the wheels for better weight distribution, though this raised the engine, requiring lowered intake systems.
1975 - 1990
Corporate Average Fuel Economystandard drove a mass changeover of cars in the U.S. to front-wheel drive. The change began in 1978, with the introduction of the first American-built transverse-engined cars, the Plymouth Horizonand Dodge Omni(based on the European designed Simca Horizon), [ cite web | title=The Dodge Omni and Plymouth Horizon | author=Bryan T. Nicalek | publisher=Allpar | url=http://www.allpar.com/omni/omni.html ] followed by the 1980 Chevrolet Citationand numerous other vehicles. By reducing drivetrain weight and space needs, vehicles could be made smaller and more efficient without sacrificing acceleration. Some suggest that the introduction of the modern Volkswagen Rabbit in 1975, from a traditional U.S. competitor, and also the Honda Civic, served as a wake-up call for the "Big Three" (only Chrysler already produced front-wheel drive vehicles in their operations outside North America). Ford's 1976 Ford Fiestawas its first front wheel drive car in Europe, GM was even later with the 1979 Vauxhall Astra/ Opel Kadett. Captive importswere the US car makers initial response to the increased demand for economy cars. Front-wheel drive became the norm for mid-sized cars starting with the 1982 Chevrolet Celebrity, 1983 Dodge 600, 1985 Nissan Maxima, and the 1986 Ford Taurus. By the mid-1980s, most formerly rear-wheel drive Japanese models were front-wheel drive, and by the mid-1990s, most American brands only sold a handful of rear-wheel drive models.
1990 - today
There were relatively few rear-wheel drive cars marketed in North America by the early 1990s;
Chrysler's car line-up was entirely front-wheel drive by 1990. GM followed suit in 1996 where its B-bodyline was phased out, where its sports cars (Camaro, Firebird, Corvette) were the only RWDs marketed; by the early 2000s, the Chevrolet Corvettewas the only RWD car offered by Chevrolet until the introduction of the Sigma platform.
The vast majority of front-wheel drive vehicles today use a transversely mounted engine with "end-on" mounted transmission, driving the front wheels via driveshafts linked via constant velocity (CV) joints. This configuration was made popular by the 1967
Simca 1100, [ cite web | title="Simca 1000 cars" | author= Andy Thompson and Matt Cotton | publisher=Rootes-Chrysler.co.uk | url=http://rootes-chrysler.co.uk/simca-cars/simca-1000.html ] and the 1969 Fiat 128.Fact|date=February 2007 The 1959 Mini, while a pioneering transverse front-wheel drive vehicleFact|date=February 2007, used a substantially different arrangement with the transmission in the sump. Volvo Carshas switched its entire linup after the 900 series to front wheel drive. Swedish engineers at the company have said that transversely mounted engines allow for more crumple zone area in a head on collision. American auto manufacturers are now shifting larger models (such as the Chrysler 300and most of the Cadillaclineup) back to rear-wheel drive. [ cite web | title=The Chrysler-Dodge LX Cars: Charger, Challenger, 300, 300C, and Magnum | publisher=Allpar | url=http://www.allpar.com/cars/lx/index.html ] [ cite web | title=Cadillac goes to RWD - rear-wheel drive | publisher=Automotive Industries (extracted in LookSmart) | url=http://findarticles.com/p/articles/mi_m3012/is_n9_v178/ai_21155112 ]
Cadillac Eldorado, with front-wheel drive introduced in 1967, holds the record for the largest engine in a front-wheel drive production vehicle, at 8.2 L (500 in³), starting with the 1970 model, lasting until the 1976 model year.Fact|date=February 2007
*In acceleration, the
Dodge SRT-4holds the world record for the quickest production Turbo front-wheel drive production vehicle. [ [http://dodge.off-road.com/dodge/article/articleDetail.jsp?id=365982 Dodge] ]
Citroën SMbroke the land speed record for its class at Bonneville Salt Flatsin Utahin 1987, going 202 mph (325 km/h), a record for a front-wheel drive vehicle. [ [http://www.infoweb.nl/smworld/achievem1.htm Infoweb] ]
Wikimedia Foundation. 2010.
Look at other dictionaries:
front-wheel drive — front′ wheel drive′ n. aum an automotive drive system in which engine power is transmitted through the front wheels only • Etymology: 1925–30 … From formal English to slang
front-wheel drive — n. an automotive design in which only the front wheels receive driving power from the front mounted engine … English World dictionary
front-wheel drive — noun uncount a system in which the engine supplies power to the front wheels of a car a. count a car with this system … Usage of the words and phrases in modern English
front-wheel drive — ► NOUN ▪ a transmission system that provides power to the front wheels of a motor vehicle … English terms dictionary
front-wheel drive — /frunt hweel , weel /, Auto. a drive system in which engine power is transmitted through the front wheels only. [1925 30] * * * front wheel drive «FRUHNT HWEEL», a system in which power is transmitted to the front wheels of a motor vehicle. * * * … Useful english dictionary
front-wheel drive — UK / US noun Word forms front wheel drive : singular front wheel drive plural front wheel drives a) [uncountable] a system in which the engine supplies power to the front wheels of a car b) [countable] a car with this system … English dictionary
front-wheel drive — (FWD) A vehicle that is pulled by its front wheels rather than being pushed by its rear wheels. The driveshaft and center floor hump is eliminated in front wheel drive cars. The engine is located over the driving wheels so that it gains better… … Dictionary of automotive terms
front wheel drive — See front wheel drive … Dictionary of automotive terms
front-wheel drive — /frʌnt wil ˈdraɪv/ (say frunt weel druyv) noun 1. a vehicle propulsion method in which the engine power is transmitted to the front wheels (opposed to rear wheel drive and four wheel drive). 2. a vehicle with such a propulsion system. Also, front … Australian English dictionary
front-wheel drive — noun Engine layout in motor vehicles where only the front wheels are driven. Ant: rear wheel drive See Also: four wheel drive … Wiktionary