Crankshaft structure
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United States of America Patent
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-
Feb 16, 2016
Grant Date -
Jan 29, 2015
app pub date -
Jul 17, 2014
filing date -
Jul 23, 2013
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A crankshaft structure includes a crank pin section, a crank journal section, and a counter weight section arranged between the crank pin section and the crank journal section in a direction of a crankshaft. A crank arm section connecting the crank pin section and the crank journal section is formed with each of lateral edge portions extending substantially along a circumscribed tangential line connecting a base of the crank pin section and a base of the crank journal section when viewed in the direction of the crankshaft. Each of the lateral edge portions of the crank arm section includes an edge groove having a length extending between a central axis of the crank pin section and a central axis of the crank journal section when viewed in a direction to cross the crankshaft. The edge groove has a groove bottom portion formed between two reinforcing ribs.
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