Method for increasing torsional fatigue strength in crankshafts
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United States of America Patent
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Issued Date -
May 6, 2010
app pub date -
Aug 1, 2008
filing date -
Aug 1, 2008
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Abandoned
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Abstract
A method for processing a cast iron crankshaft to improve the torsional fatigue strength of the crankshaft includes forming oil holes into a portion of the crankshaft, treating the portion of the crankshaft to harden an annular area of the portion, and roller burnishing a length of the interior of the oil holes to an increased diameter. The roller burnished length of the oil holes extending from a surface of the crankshaft to at least beyond the hardened annular area.
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