Manufacturing method of a drawn cup needle roller bearing having seal ring
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United States of America Patent
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Mar 3, 2015
Grant Date -
Aug 2, 2012
app pub date -
Apr 10, 2012
filing date -
Jun 8, 2006
priority date (Note) -
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status (Latency Note)
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Abstract
A method of manufacturing a drawn cup needle roller bearing having a seal ring, including forming the seal ring by a press working by: punching a metal plate to form an annular first intermediate material; subjecting the first intermediate material to burring working such that a portion close to an inner diameter of the first intermediate material is bent in an axial direction at a right angle to form an annular second intermediate material having an L-shaped cross section, the second intermediate material comprising a cylindrical portion and an outward flange portion which is bent radially outward from an axial end portion of the cylindrical portion; removing the outward flange portion to form a cylindrical third intermediate; and subjecting the third intermediate material to cold rolling working to regulate an inner diameter, an outer diameter and a cross sectional shape of the third intermediate material.
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