Constant velocity universal joint
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United States of America Patent
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Sep 15, 2015
Grant Date -
Feb 6, 2014
app pub date -
Feb 28, 2012
filing date -
Mar 18, 2011
priority date (Note) -
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Abstract
A constant-velocity universal joint includes an outer joint member; an inner joint member arranged in an inside of the outer joint member; and torque transmitting members. At least one of the outer joint member and the inner joint member comprises track grooves that are engaged with rolling surfaces of the torque transmitting members. At least one of the components of the constant-velocity universal joint is formed of a metal sintered compact. The metal sintered compact has a relative density of 80% or more and less than 100%. The metal sintered compact comprises a hardened layer formed on a surface thereof through heat treatment. Among the components each formed of the metal sintered compact, a component having a ring shape is subjected to a cold rolling process.
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