Gear
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United States of America Patent
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-
Jan 17, 2012
Grant Date -
Nov 13, 2008
app pub date -
Jul 23, 2008
filing date -
Jul 31, 2003
priority date (Note) -
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status (Latency Note)
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Abstract
A gear comprised of a tooth surface and a hard carbon film formed on at least a part of the tooth surface. When the gear is used in lubricant including a specific component, a friction of a tooth surface of the gear is largely decreased, and therefore the gear performs an excellent power transmission efficiency. Further, when the gear is employed in a planetary gear mechanism or speed reducing mechanism which has a plurality of meshing portions of gears, the power transmission efficiency of the mechanism is also improved.
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