Differential pinion, metal mold for plastic working the same, and method for plastic working with the metal mold
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United States of America Patent
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Sep 21, 1993
Issued Date -
N/A
app pub date -
Oct 8, 1992
filing date -
Sep 19, 1989
priority date (Note) -
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Abstract
The present invention relates to a differential pinion for automobiles or the like, a metal mold for plastic working the differential pinion, and a method for plastic working with the above metal mold. And particularly the differential pinion of the present invention is provided with an end relief section which is effective to reduce a noise and has a continuous fiber flow from a tooth face to the end relief section providing a high pitting resistance. The metal mold for plastic working the differential pinion of the present invention can provide the internal pressure working area of the die in a position deep below the open end by a required distance therefrom, thereby providing the metal mold with higher rigidity and strength. Further, in the plastic working method of the present invention, it is very easy to position the punch under pressure stress in the axial direction.
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