Method of manufacturing multi-stage pulley
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United States of America Patent
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-
Jan 15, 2002
Grant Date -
N/A
app pub date -
Mar 23, 1999
filing date -
Mar 23, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The manufacturing cost of a multi-stage pulley is reduced without coaxially arranging a plurality of groove forming sections. While a portion between groove sections 103 is being pushed by a pushing roller 204, the groove sections 103 are successively formed. While a portion of workpiece W2 pushed by a groove forming roller 206 to form one groove section 103a and a portion of workpiece W2 pushed by a groove forming roller 207 to form the other groove section 103b are being shifted from each other in the circumferential direction, one groove section (103a) and the other groove section (103b) are simultaneously formed. Due to the foregoing, when the groove sections 103 are formed, it is possible to prevent the deformation of the groove section 103 and the groove section 103 which is adjacent to it. Accordingly, it is possible to enhance the yield of the multi-stage pulley 100 without coaxially arranging a plurality of groove forming sections. Therefore, the cost of manufacturing the multi-stage pulley 100 can be reduced.
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