A threaded tubular element for threaded tubular connection resistant to fatigue and resulting threaded tubular connection.

摘要

A threaded tubular element male or female (1, 2) for threaded tubular connection (100, 300), formed at the end of a tube (101, 102, 202, 301, 302) and including a male threads (3, 303 , 303¿) or an internal female thread (4, 304, 304¿) as the threaded member is the male or female type, whose wires (11, 12) viewed in longitudinal section through the axis of the threaded element comprising a thread crest (17, 20, S1, S2), a thread (18, 19, F1, F2), one flank of rectilinear load (13, 14), one flank of rectilinear plug (15, 16) and two areas tangential link thread root (21, 22, 51, 52) being disposed each of these two zones between the thread root and one of the two flanks termed the corresponding flank and comprising an arc, characterized by at least one of the two tangential junction zones of the thread root area called ¿múltiples¿ radios comprises an arc called arc circ main unferencia (23, 24, 53, 54) whose circumference of short support the straight line of the corresponding flank at a point called the reference point flank (PRF1, PRF2, PRF3, pRF4) and a regular curve called secondary curve (25 , 26, 27, 55, 56) to either side of the principal arc, which connects tangentially to it, on the one hand, to the corresponding flank and, moreover, the thread root, and that a) in the reference point sidewall, the tangent (61, 62, 67, 68) to the circumference of the principal arc support forms a strictly positive acute angle (D, F) with the straight line of the corresponding flank being such the positive sense that the principal arc does not undermine matter thread flank; b) said circumference arc short head circumference support or is tangent to the line of the thread root support according to the secondary curve on the bottom side of yarn respectively possesses a non-zero length or is reduced to a point, forming the tangent to said circumference support (63), at the point considered of intersection (PRR1) or tangency angle (E) between -15 and + 15 ° with the straight line of the thread root support.