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In a reciprocating engine, the crankpins, also known as crank journals are the journals of the big end bearings, at the ends of the connecting rods opposite to the pistons. If the engine has a crankshaft, then the crank pins are the journals of the off-centre bearings of the crankshaft. In a beam engine, the single crank pin is mounted on the flywheel; In a steam locomotive, the crank pins are often mounted directly on the driving wheels. ==Big end bearings== Big end bearings are commonly bushings or plain bearings, but less commonly may be roller bearings, see ''crankshaft''. In a multi-cylinder engine, a crankpin can serve one or many cylinders, for example: * In a straight (parallel) or flat (boxer) engine, each crankpin normally serves just one cylinder. * In a V engine, each crankpin usually serves two cylinders, one in each cylinder bank. * In a radial engine, each crankpin serves an entire row of cylinders. 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「Crankpin」の詳細全文を読む スポンサード リンク
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