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,
F4 layout
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[clarification needed] 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]
Center transfer case sending power from the transmission to the rear axle (right) and front axle (left)
The HMMWV is a 4WD/AWD that powers all wheels evenly (continuously) via a manually lockable center differential, with Torsen differentials for both front and rear.
^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.
^"The Origins of Four-Wheel Drive". Hemmings Motor News. December 2019. Retrieved 5 May 2021.
^Swan, Ian (3 December 2015). "Comparisons of Drivetrains - FWD, RWD, AWD". YourMechanic. Retrieved 2 October 2021.
^Markovich, Tony (17 July 2020). "AWD vs. 4WD: Know the Differences". The Drive. Retrieved 5 May 2021.
^"Which Hybrids Have All-Wheel Drive?". AutoTrader.ca. 26 August 2020. Retrieved 23 April 2022.
March 16, 2023
front, engine, four, wheel, drive, layout, this, article, needs, additional, citations, verification, please, help, improve, this, article, adding, citations, reliable, sources, unsourced, material, challenged, removed, find, sources, news, newspapers, books, . This article needs additional citations for verification Please help improve this article by adding citations to reliable sources Unsourced material may be challenged and removed Find sources Front engine four wheel drive layout news newspapers books scholar JSTOR October 2021 Learn how and when to remove this template message 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 F4 layout 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 amp 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 clarification needed 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 Examples Edit 1943 Willys Jeep A Troller T4 jeep 2008 2009 Jeep Liberty Center transfer case sending power from the transmission to the rear axle right and front axle left The HMMWV is a 4WD AWD that powers all wheels evenly continuously via a manually lockable center differential with Torsen differentials for both front and rear First generation Dodge Power Wagon Land Rover Series I Nissan Skyline GT R V Spec II BNR34 Mitsubishi Lancer Evolution X MR Subaru WRX STI Ferrari FF with a front mid engine four wheel drive layout Audi Quattro Toyota Celica GT Four ST205 References Edit 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 The Origins of Four Wheel Drive Hemmings Motor News December 2019 Retrieved 5 May 2021 Swan Ian 3 December 2015 Comparisons of Drivetrains FWD RWD AWD YourMechanic Retrieved 2 October 2021 Markovich Tony 17 July 2020 AWD vs 4WD Know the Differences The Drive Retrieved 5 May 2021 Which Hybrids Have All Wheel Drive AutoTrader ca 26 August 2020 Retrieved 23 April 2022 Retrieved from https en wikipedia org w index php title Front engine four wheel drive layout amp oldid 1123062995, wikipedia, wiki, book, books, library,
