Constant velocity universal joint outer joint member and manufacturing method for same
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United States of America Patent
Stats
-
May 7, 2019
Grant Date -
May 18, 2017
app pub date -
May 20, 2015
filing date -
Jun 18, 2014
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A cup member has a cylindrical portion, a bottom portion, and a short shaft portion having a solid shaft shape and including a joining end surface at an end portion thereof. A shaft member has a solid shaft shape and includes a joining end surface at one end thereof. The joining end surfaces of the cup and shaft members are brought into abutment against each other and welded from a radially outer side to form a welded portion. At this time, center segregation is prevented from interfering with the welded portion. The cup member is formed by forging including upsetting a billet having a columnar shape successively in a plurality of stages, extruding the cylindrical portion and the short shaft portion, and ironing the cylindrical portion. In the course of the upsetting, a region of the billet corresponding to a bottom side of the cup member is narrowed.
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