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Front-engine, four-wheel-drive layout

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F4 layout
F4 layout

In automotive design, an F4, or front-engine, four-wheel drive (4WD) layout places the internal combustion engine at the front of the vehicle and drives all four roadwheels. This layout is typically chosen for better control on many surfaces, and is an important part of rally racing, as well as off-road driving. In terms of racing purposes, whether it be on-road or off-road, can be described as follows,

A team that pursues the Weak LS4WD architecture will minimize the development cost of the front-wheel drive system at the expense of having a larger rear powertrain. The Weak architecture produces a vehicle with a large powersplit between the front and rear powertrains, while the Strong architecture recommends a vehicle with more similar power and torque requirements for the front and rear.[1]

Most four-wheel-drive layouts are front-engined and are derivatives of earlier front-engine, rear-wheel drive, or front-engine, front-wheel drive designs. The first origins of it were introduced in the 1820s from steam coach builders Burstall & Hill. This was then re-created by many other manufactures, such as "British engineer Joseph Diplock patented a four-wheel-drive system for a traction engine, while in Vienna, Austria, Ferdinand Porsche developed an electric vehicle that also had all wheels driven, with an electric motor at each corner, as early as 1899". This layout is designed for off road vehicles to have the most traction in strenuous situations without losing too much cargo space at the same time.[2] However, the 1903 Spyker 60 HP was the first official car built with an F4 drive layout.

This layout is also the drive train of choice for off-road pickup trucks and SUVs. It allows these vehicles to get the most traction without sacrificing cargo or passenger room. Part-time four-wheel drive vehicles frequently have a transfer case and no center differential, meaning, in many cases, the 4WD mode does not allow any difference in front and rear axle speeds. For normal road driving, these vehicles are shifted into 2WD mode, to prevent damage to the transfer case. Full-time four-wheel drive systems, on the other hand, cannot do without some kind of center differential.[3] The purpose of four-wheel drive is to maintain optimal traction when manually selected. A vehicle has four-wheel drive when the front and rear driveshafts can be locked together to move at the same speed and send the same amount of torque to all four wheels.[4]

Several four-wheel-drive vehicles have been built without a drive shaft between the front combustion engine and rear wheels; instead the rear wheels receive power and torque from a rear electric motor. This setup has been mainly used by hybrid electric vehicles, although some conventional vehicles had also adopted the system.[5]

Discover more about Front-engine, four-wheel-drive layout related topics

Automotive design

Automotive design

Automotive design is the process of developing the appearance of motor vehicles - including automobiles, motorcycles, trucks, buses, coaches, and vans.

Internal combustion engine

Internal combustion engine

An internal combustion engine is a heat engine in which the combustion of a fuel occurs with an oxidizer in a combustion chamber that is an integral part of the working fluid flow circuit. In an internal combustion engine, the expansion of the high-temperature and high-pressure gases produced by combustion applies direct force to some component of the engine. The force is typically applied to pistons, turbine blades, a rotor, or a nozzle. This force moves the component over a distance, transforming chemical energy into kinetic energy which is used to propel, move or power whatever the engine is attached to. This replaced the external combustion engine for applications where the weight or size of an engine were more important.

Off-roading

Off-roading

Off-roading is the activity of driving or riding in a vehicle on unpaved surfaces such as sand, gravel, riverbeds, mud, snow, rocks, and other natural terrain. Types of off-roading range in intensity, from leisure drives with unmodified vehicles, to competitions with customized vehicles and professional drivers. Off-roaders have been met with criticism for the environmental damage caused by their vehicles. There have also been extensive debates over the role of government in regulating the sport, including a Supreme Court case brought against the Bureau of Land Management in the United States.

Front-wheel drive

Front-wheel drive

Front-wheel drive (FWD) is a form of engine and 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 engine arrangement generally found in rear-wheel drive and four-wheel drive vehicles.

Front-engine, rear-wheel-drive layout

Front-engine, rear-wheel-drive layout

A front-engine, rear-wheel-drive layout (FR) is an automotive design with an engine in front and rear-wheel-drive, connected via a drive shaft. This arrangement, with the engine straddling the front axle, was the traditional automobile layout for most of the 20th century.It is also used in trucks, pickups, and high-floor buses and school buses.

Front-engine, front-wheel-drive layout

Front-engine, front-wheel-drive layout

In automotive design, a front-engine, front-wheel-drive (FWD) layout, or FF layout, places both the internal combustion engine and driven roadwheels at the front of the vehicle.

Bramah Joseph Diplock

Bramah Joseph Diplock

Bramah Joseph Diplock was an English inventor who invented the pedrail wheel in 1899 and the pedrail chaintrack, a type of caterpillar track, in 1907.

Ferdinand Porsche

Ferdinand Porsche

Ferdinand Porsche was an Austro-Bohemian automotive engineer and founder of the Porsche AG. He is best known for creating the first gasoline–electric hybrid vehicle (Lohner–Porsche), the Volkswagen Beetle, the Auto Union racing car, the Mercedes-Benz SS/SSK, several other important developments and Porsche automobiles.

Pickup truck

Pickup truck

A pickup truck or pickup is a light-duty truck that has an enclosed cabin, and a back end made up of a cargo bed that is enclosed by three low walls with no roof. In Australia and New Zealand, both pickups and coupé utilities are called utes, short for utility vehicle. In South Africa, people of all language groups use the term bakkie, a diminutive of bak, Afrikaans for "basket".

Differential (mechanical device)

Differential (mechanical device)

A differential is a gear train with three drive shafts that has the property that the rotational speed of one shaft is the average of the speeds of the others. A common use of differentials is in motor vehicles, to allow the wheels at each end of a drive axle to rotate at different speeds while cornering. Other uses include clocks and analog computers.

Drive shaft

Drive shaft

A drive shaft, driveshaft, driving shaft, tailshaft, propeller shaft, or Cardan shaft is a component for transmitting mechanical power and torque and rotation, usually used to connect other components of a drivetrain that cannot be connected directly because of distance or the need to allow for relative movement between them.

Electric motor

Electric motor

An electric motor is an electrical machine that converts electrical energy into mechanical energy. Most electric motors operate through the interaction between the motor's magnetic field and electric current in a wire winding to generate force in the form of torque applied on the motor's shaft. An electric generator is mechanically identical to an electric motor, but operates with a reversed flow of power, converting mechanical energy into electrical energy.

Examples

Discover more about Examples related topics

Willys MB

Willys MB

The Willys MB and the Ford GPW, formally the U.S. Army Truck, 1⁄4-ton, 4×4, Command Reconnaissance, informally the Willys Jeep, Jeep, or jeep, and sometimes referred to by its supply catalogue designation G503, are American off-road four-wheel drive military light utility vehicles, built in large numbers to a single standardized design, for the United States and the Allies of World War II from 1941 until 1945.

Troller T4

Troller T4

The Troller T4 was a four-wheel drive/rear-wheel drive vehicle made by Troller. It was only available as a two-door car with a fiberglass body and steel chassis, with a design inspired by the Jeep. It has standard 4WD, a 5-speed manual transmission and Dana axles. The engine is a 3.0 L turbo Diesel built by MWM and was introduced in 2004.

Jeep Liberty

Jeep Liberty

The Jeep Liberty is a four door unibody compact SUV four-door manufactured and marketed by Jeep for model years 2002–2012 over two generations, internally designed the KJ (2002-2007) and KK (2008-2012), respectively. Both generations were marketed globally, including as the Jeep Cherokee outside North America.

Torsen

Torsen

Torsen Torque-Sensing is a type of limited-slip differential used in automobiles.

Dodge Power Wagon

Dodge Power Wagon

The Dodge Power Wagon is a four-wheel drive medium duty truck that was produced in various model series from 1945 to 1980 by Dodge. The Power Wagon name was revived for the 2005 model year as a four-wheel drive version of the Dodge Ram 2500. As a nameplate, "Power Wagon" continues as a special package of the four-wheel drive version of 3/4 ton Ram Trucks 2500 model.

Nissan Skyline GT-R

Nissan Skyline GT-R

The Nissan Skyline GT-R is a sports car based on the Nissan Skyline range. The first cars named "Skyline GT-R" were produced between 1969 and 1972 under the model code KPGC10, and were successful in Japanese touring car racing events. This model was followed by a brief production run of second-generation cars, under model code KPGC110, in 1973.

Mitsubishi Lancer Evolution X

Mitsubishi Lancer Evolution X

The Mitsubishi Lancer Evolution X is the tenth and final generation of the Lancer Evolution, a sports sedan produced by Japanese manufacturer Mitsubishi Motors.

Subaru WRX

Subaru WRX

The Subaru WRX is an all-wheel drive sport compact car manufactured by the Japanese automaker Subaru, originally based on the Impreza created for the World Rally Championship in 1992. Subaru claimed the name WRX stands for "World Rally eXperimental". Since 2014, the WRX lineup has been split from the Impreza, with a different body style that is not offered as an optional hatchback/wagon, being introduced as the separate Levorg model.

Ferrari FF

Ferrari FF

The Ferrari FF is a grand tourer presented by Italian automobile manufacturer Ferrari on March 1, 2011, at the Geneva Motor Show as a successor to the 612 Scaglietti grand tourer. It is Ferrari's first production four-wheel drive model. The body style has been described as a shooting brake, a type of two-door coupé-based sporting estate. The FF has a top speed of 335 km/h (208 mph) and it accelerates from 0 to 100 km/h (62 mph) in 3.7 seconds. Ferrari states that the FF was the world's fastest four-seat automobile upon its release to the public. The FF costs US$300,000, with 800 being produced during the first year.

Audi Quattro

Audi Quattro

The Audi Quattro is a road and rally car, produced by the German automobile manufacturer Audi, part of the Volkswagen Group. It was first shown at the 1980 Geneva Motor Show on 3 March. Production continued through 1991.

Toyota Celica GT-Four

Toyota Celica GT-Four

The Toyota Celica GT-Four is a high performance model of the Celica Liftback that was produced from 1986 to 1999, with a turbocharged 3S-GTE engine, and full-time AWD. It was created to compete in the World Rally Championship, whose regulations dictate that a manufacturer must build road-going versions of the vehicle in sufficient numbers. These vehicles are referred to as "homologation special vehicles".

Source: "Front-engine, four-wheel-drive layout", Wikipedia, Wikimedia Foundation, (2022, November 21st), https://en.wikipedia.org/wiki/Front-engine,_four-wheel-drive_layout.

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References
  1. ^ Owen, Elliot Douglas (June 2018). The Benefits of Four-Wheel Drive for a High-Performance FSAE Electric Racecar (PDF) (Thesis). Massachusetts Institute of Technology. OCLC 1080309406. Retrieved 2 October 2021.
  2. ^ "The Origins of Four-Wheel Drive". Hemmings Motor News. December 2019. Retrieved 5 May 2021.
  3. ^ Swan, Ian (3 December 2015). "Comparisons of Drivetrains - FWD, RWD, AWD". YourMechanic. Retrieved 2 October 2021.
  4. ^ Markovich, Tony (17 July 2020). "AWD vs. 4WD: Know the Differences". The Drive. Retrieved 5 May 2021.
  5. ^ "Which Hybrids Have All-Wheel Drive?". AutoTrader.ca. 26 August 2020. Retrieved 23 April 2022.

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