Magnetic encoder and bearing device including magnetic encoder
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United States of America Patent
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Oct 25, 2016
Grant Date -
Apr 30, 2015
app pub date -
Sep 29, 2014
filing date -
Oct 24, 2013
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A magnetic encoder 1 including a support member 2 attached to a rotating body 12 and a magnet member 3 fixed to the support member 2, the support member 2 and the magnet 4 are not attached to each other using an adhesive but the support member 2 and the plastic magnet 4 are joined together by molding shrinkage or wrap-around form of the magnet 4, and the material for the magnet 4 is selected such that the value of the ratio ((αp−αm)/εc) of a difference (αp−αm) between flowing-direction linear expansion coefficient (αp) of the magnet 4 and linear expansion coefficient (αm) of the support member 2, to tensile breaking strain (εc) of the material for the magnet 4 is equal to or less than a value beginning at a threshold (Nth) based on a prescribed value of cycle member at thermal shock destructive test.
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