CRANKSHAFT, INTERNAL COMBUSTION ENGINE, TRANSPORTATION APPARATUS, AND PRODUCTION METHOD FOR CRANKSHAFT
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United States of America Patent
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app pub date -
Mar 21, 2008
filing date -
Mar 23, 2007
priority date (Note) -
Abandoned
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Abstract
A crankshaft having a crankpin, a crank journal, and a crank arm for linking the crankpin and the crank journal, includes a pin fillet portion located between the crankpin and the crank arm, and a journal fillet portion located between the crank journal and the crank arm. At least one of the crankpin and the crank journal has a diameter of no less than about 20 mm and no more than about 40 mm. At least one of the pin fillet portion and the journal fillet portion contains a quench-hardened layer having a thickness of no less than about 1 mm and no more than about 2 mm in the vicinity of a surface thereof. The crankpin and the crank journal substantially do not contain any quench-hardened layer having a thickness exceeding about 2 mm in the vicinity of a surface thereof.
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