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Front-engine, front-wheel-drive layout
In automotive design, an FWD, or Front-engine, Front-wheel-drive layout places both the internal combustion engine and driven roadwheels at the front of the vehicle.
==Usage implications==
In contrast with the front-engine, rear-wheel-drive layout (RWD), the FWD layout eliminates the need for a central tunnel or a higher chassis clearance to accommodate a driveshaft providing power to the rear wheels. Like the rear-engine, rear-wheel-drive layout (RR) and rear mid-engine, rear-wheel-drive layout (RMR) layouts, it places the engine over the drive wheels, improving traction in many applications. As the steered wheels are also the driven wheels, FWD cars are generally considered superior to RWD cars in conditions where there is low traction such as snow, mud, gravel or wet tarmac. When hill climbing in low traction conditions RR is considered the best two-wheel-drive layout, primarily due to the shift of weight to the rear wheels when climbing. The cornering ability of a FWD vehicle is generally better, because the engine is placed over the steered wheels. However, as the driven wheels have the additional demands of steering, if a vehicle accelerates quickly, less grip is available for cornering, which can result in understeer.〔(【引用サイトリンク】title=Engine & Driveline Layouts )〕 High-performance vehicles rarely use the FWD layout because weight is transferred to the rear wheels under acceleration, while unloading the front wheels and sharply reducing their grip, effectively putting a cap on the amount of power which could realistically be utilized; in addition, the high horsepower of high-performance cars can result in the sensation of torque steer. Electronic traction control can avoid wheel-spin but largely negates the benefit of extra power.〔(www.motortrend.com ) Road Test: Rear Drive vs. Front Drive vs. All-Wheel Driv〕 This was a reason for the adoption of the four-wheel-drive quattro system by front wheel drive specialist Audi with the 1980 Audi Quattro for road cars. Although it was first used in the 1960s Jensen FF to overcome FR layout traction problems in a high performance road car.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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