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| Four-wheel-drive ： ウィキペディア英語版 |
Four-wheel drive
Four-wheel drive, 4×4 ("four by four"), 4WD, and AWD is a form of drivetrain most commonly capable of providing power to all wheel ends of a two-axled vehicle simultaneously. It may be full-time or on-demand, and may be linked via a transfer case to provide multiple gear ranges.
A four-wheeled vehicle with power supplied to both axles may be described as "all-wheel drive". However, not all "four-wheel drive" vehicles are "all-wheel drive", as vehicles with more than two axles may also be described as "four-wheel drive" regardless of how many axles, so long as two axles (of two wheel ends apiece) are powered.〔NACFE (North American Council for Freight Efficiency) Executive Report – 6x2 (Dead Axle) Tractors () "A typical three axle Class 8 tractor today is equipped with two rear drive axles (“live” tandem) and is commonly referred to as a 6 X 4 configuration meaning that it has four-wheel drive capability."〕
==Definitions==
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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