FATIGUE RESISTANT THREAD PROFILE WITH COMBINED CURVE ROUNDING

摘要

A threaded connector that includes a pin end having external threads and a box end having internal threads that are complementary to the external threads has a thread profile that defines at least a portion of either or both of the internal threads and the external threads. The thread profile may include a thread root connecting a first flank to a second flank and the thread root may be at least partially defined by a plurality of tangentially interconnected radii. The plurality of radii may include at least a medial radius, a first distal radius on one side of the medial radius, and a second distal radius on the another side of the medial radius. The medial radius may be larger than the first and the second distal radius. Alternatively, the thread profile includes a thread root connecting a first flank to a second flank that is at least partially defined by a plurality of radii, each radius having a different length and each defining a circular arc.

主权项

1. A threaded connector, comprising:
a pin end having external threads; a box end having internal threads that are complementary to the external threads; and a thread profile that defines at least a portion of one of the internal threads and the external threads, the thread profile including a thread root connecting a first flank to a second flank, the thread root being at least partially defined by a plurality of tangentially interconnected radii, the plurality of radii including at least:
a medial radius,a first distal radius on one side of the medial radius, anda second distal radius on the another side of the medial radius, wherein the medial radius is larger than the first and the second distal radius.