Method for producing a sheet metal poly-V groove pulley and a sheet metal poly-V groove pulley
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United States of America Patent
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Mar 31, 1998
Grant Date -
N/A
app pub date -
Jul 8, 1996
filing date -
Jan 27, 1995
priority date (Note) -
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Abstract
The present invention relates a method of producing a sheet metal poly-V groove pulley in which a thickened annular peripheral wall of an outer peripheral side of a base plate is holding held and pressed so as to increase the axial length of the annular peripheral wall, thereby forming a drum wall and preliminary ears projected from the root portion of the drum wall, and thereafter a step of forming poly-V grooves and ears is performed so that poly-V grooves and ears which are obtained by further projecting the preliminary ears and have a single layer structure are formed on the drum wall. According to this method, the preliminary ears are previously formed and then further projected so as to form the ears. Even when a sheet metal member is thin, therefore, ears of a single-layer structure which has a sufficient projection degree can be obtained.
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