专利检索 ap:("Tenaris Connections B.V.") AND inv:"Amato, Stefano" 第 1 页

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发明授权
Threaded connection with improved root thread profile 有权

公开(公告)号：EP2602423B1

公开(公告)日：2018-09-12

申请号：EP12193698.3

申请日：2012-11-21

申请人： Tenaris Connections B.V.

发明人： Mazzaferro, Gaston Mauro , Coppola, Tommaso , Amato, Stefano , Armendariz, Ramon Alberto Aguilar , Darcis, Philippe Pierre

IPC分类号： E21B17/042 , F16L15/06

CPC分类号： B23G1/02 , E21B17/042 , F16L15/001 , F16L15/06 , Y10T82/10 , Y10T408/03

摘要： A threaded connection design having a double ellipse in the thread root for reducing stress fatigue is illustrated in this disclosure. The root groove includes a first portion comprising a first elliptical surface being part of a first ellipse. The root groove further includes a second portion comprising a second elliptical surface, being part of a second ellipse, and the second elliptical surface being joined tangentially at a first end to the first elliptical surface at a junction point that defines the bottom of the root groove. The second elliptical surface is joined tangentially at a second end to the load flank.