Fixed-type constant velocity universal joint
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United States of America Patent
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Jul 8, 2014
Grant Date -
May 2, 2013
app pub date -
Jul 19, 2011
filing date -
Aug 5, 2010
priority date (Note) -
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Abstract
A fixed type constant velocity universal joint comprises a ball and a lubricating grease sealed therein. A surface roughness of the ball is set to Ra 0.15 μm or less and a surface roughness of a counterpart surface on which the ball rolls is set to be higher than the surface roughness of the ball. An additive composition of the lubricating grease comprises a base oil, a diurea compound, molybdenum dithiocarbamate, zinc dialkyldithiophosphate, melamine cyanurate, molybdenum disulfide, and calcium salt of alkylaromatic sulfonic acid.
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