High density dual helical gear and method for manufacture thereof
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United States of America Patent
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Apr 29, 2008
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N/A
app pub date -
Jun 21, 2005
filing date -
Jul 14, 2004
priority date (Note) -
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Abstract
The present invention relates to a low cost technique for manufacturing dual helical gears, such as herringbone gears, from powder metals. The dual helical gears made by this technique are of high density (greater than 92% of theoretical density) and offer superior strength. The present invention more specifically discloses a forged metal herringbone gear which is comprised of a body and a plurality of teeth wherein the metal has a density of greater than 92% of theoretical and wherein the grain in the teeth is one range higher on the ASTM E 112 grain size chart than the grain in the body of the gear. The present invention also discloses a method for manufacturing a high density forged dual helical gear.
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