FIELD: soil or rock drilling; mining.
SUBSTANCE: invention relates to threaded pipe joint. Threaded connection contains the first and the second pipe components with the appropriate male and female ends. Female end comprises, on outer peripheral surface, at least one threaded zone and ends on extreme surface oriented radially relative to joint axis. Female end comprises, on inner peripheral surface, at least one threaded zone and ends on extreme surface oriented radially relative to joint axis. Width of teeth of male threaded zone, CWTp, increases from CWTpmin value of tooth width closest to male end extreme surface to CWTpmax value width of tooth farthest from outer surface of male end, and width of recesses of male threaded zone, CWRp, increases from CWRpmin value of recess width, furthest from end surface of male end, to CWRpmax value width of recess closest to said extreme surface. At that width of teeth of female threaded zone, CWTb, decreases with value of CWTbmax width of tooth farthest from outer surface of female end to CWTbmin value of tooth width closest to outer surface of female end (8), and width of recesses of female threaded zone, CWRb, decreases from CWRbmax value width of recess closest to outer surface of female end to CWRbmin value of the recess the furthest from the outermost surface. At least one part of at least one threaded zone on the male end and at least one part of at least one threaded zone at the female end interact in accordance with self-locking screwing.
EFFECT: technical result is improvement of fatigue characteristics.
20 cl, 20 dwg
