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thumb A drive shaft, driveshaft, driving shaft, propeller shaft (prop shaft), or Cardan shaft is a mechanical component for transmitting torque and rotation, usually used to connect other components of a drive train that cannot be connected directly because of distance or the need to allow for relative movement between them. As torque carriers, drive shafts are subject to torsion and shear stress, equivalent to the difference between the input torque and the load. They must therefore be strong enough to bear the stress, whilst avoiding too much additional weight as that would in turn increase their inertia. To allow for variations in the alignment and distance between the driving and driven components, drive shafts frequently incorporate one or more universal joints, jaw couplings, or rag joints, and sometimes a splined joint or prismatic joint. ==History== The term drive shaft first appeared during the mid 19th century. In Storer's 1861 patent reissue for a planing and matching machine, the term is used to refer to the belt-driven shaft by which the machine is driven.〔Henry D. Stover, Improvement in Wood-Planing Machines, (U.S. Patent Reissue 1,190 ), May 21, 1861.〕 The term is not used in his original patent.〔Henry D. Stover, Planing Machine, (U.S. Patent 30,993 ), Dec. 18, 1860, 1861.〕 Another early use of the term occurs in the 1861 patent reissue for the Watkins and Bryson horse-drawn mowing machine.〔John DeLancy Watkins and Robert Bryson, Mowing Machines, (U.S. Patent Reissue 1,904 ), July 23, 1861.〕 Here, the term refers to the shaft transmitting power from the machine's wheels to the gear train that works the cutting mechanism. In the 1890s, the term began to be used in a manner closer to the modern sense. In 1891, for example, Battles referred to the shaft between the transmission and driving trucks of his Climax locomotive as the drive shaft,〔Rush S. Battles, Locomotive, (U.S. Patent 455,154 ), June 30, 1891.〕 and Stillman referred to the shaft linking the crankshaft to the rear axle of his shaft-driven bicycle as a drive shaft.〔Walter Stillman, Bicycle, (U.S. Patent 456,387 ), July 21, 1891.〕 In 1899, Bukey used the term to describe the shaft transmitting power from the wheel to the driven machinery by a universal joint in his Horse-Power.〔Dudley D. Bukey, Horse-Power, (U.S. Patent 631,198 ), Aug. 15, 1899.〕 In the same year, Clark described his Marine Velocipede using the term to refer to the gear-driven shaft transmitting power through a universal joint to the propeller shaft.〔Charles Clark, Marine Velocipede, (Patent 637,547 ), Nov. 21, 1899.〕 Crompton used the term to refer to the shaft between the transmission of his steam-powered Motor Vehicle of 1903 and the driven axle.〔Charles Crompton, Motor-Vehicle (U.S. Patent 718,097 ), Jan. 1903.〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Drive shaft」の詳細全文を読む スポンサード リンク
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