Bearing For Four-Cycle Engine
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United States of America Patent
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Issued Date -
Apr 16, 2009
app pub date -
Oct 9, 2008
filing date -
Oct 11, 2007
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A bearing capable of enduring long use in a four-cycle engine is provided. The bearing is provided with a hollow cylindrical retainer 1 made of steel and rotatably retaining a plurality of needle rollers 4. The retainer 1 is subjected to a sulphonitriding treatment to form a sulphonitrided layer 11 on a surface of the retainer 1. The sulphonitrided layer 11 is made up of a nitrogen-compound single-layer 12 deposited on the surface of the retainer 1 made of steel, and a sulfur-compound porous layer 13 formed continuously on the nitrogen-compound single-layer 12 and forming a surface layer of the sulphonitrided layer 11.
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