Threaded connection for enhanced fatigue resistance

F - Mech Eng,Light,Heat,Weapons – 16 – L

Patent

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Details

F16L 15/00 (2006.01) E21B 17/08 (2006.01) F16L 15/04 (2006.01) F16L 15/06 (2006.01) F16L 25/00 (2006.01) E21B 17/042 (2006.01)

Patent

CA 2288740

A threaded connection for improving fatigue resistance to cyclic loading is disclosed. The threaded connection (10) basically comprises a pair of interlocking members (12, 16) having corresponding radially inner (52) and radially outer (50) spiral threads thereon, each spiral thread including a spiral compression flank (56, 68) and a spiral tension flank (58, 64) wherein at least one of the spiral compression flanks (56, 68) and spiral tension flanks (58, 64) on the inner spiral threads are in planar engagement with a corresponding spiral compression flank (56, 68) and spiral tension flank (58, 64) on the outer spiral thread. Axial spacing between the tension flanks (58, 64) and the compression flanks (56, 68) on the radially inner and radially outer spiral threads further define a stress reducing spiral root surface (60, 62) on at least one of the radially inner (52) and radially outer (50) threads and a corresponding crest surface (54, 66) on the other radially inner and radially outer spiral threads.

L'invention concerne un raccord fileté destiné à présenter une meilleure résistance à la fatigue sous charge cyclique. Ledit raccord fileté (10) comprend essentiellement deux éléments de verrouillage (12, 16) pourvus d'un filetage spiralé radialement intérieur (52) et d'un filetage spiralé radialement extérieur (50) correspondants, chaque filetage spiralé comprenant un flanc de compression spiralé (56, 68) et un flanc de tension spiralé (58, 64), un des flancs de compression spiralé (56, 68) au moins et un des flancs de tension spiralé(58, 64) au moins du filetage spiralé intérieur étant au contact planaire d'un flanc de compression spiralé (56, 68) et d'un flanc de tension spiralé (56, 68) correspondants sur le filetage spiralé extérieur. L'espacement axial entre les flancs de tension (58, 64) et les flancs de compression (56, 68) sur les filetages spiralés radialement intérieur et extérieur définit en outre une surface de pied spiralée réduisant la contrainte (60, 62) sur un des filetages radialement intérieur (52) et radialement extérieur (50) au moins et une surface de crête (54, 66) correspondante sur le filetage spiralé radialement intérieur et radialement extérieur correspondant.

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