Taper threaded joint

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

Patent

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Details

F16L 15/06 (2006.01)

Patent

CA 2411851

A taper threaded joint, wherein a clearance (L1[mm]) between the thread top face (1a) of a tapered male thread (1) and the thread bottom face (2b) of a tapered female thread (2) or a clearance (L2[mm]) between the thread bottom face (1c) of the tapered male thread (1) and the thread top face (2c) of the tapered female thread (2), whichever comes smaller (L[mm]), is so related as .delta.<=L.bullet. (tan.alpha.+tan.beta.) to a load surface angle (.alpha.[~]) and an inserting surface angle (.beta.[~]), and an axial clearance (.delta.[mm]) produced in the lateral direction of the thread as a difference between the top width of the tapered male thread (1) and the bottom width of the tapered female thread (2) threaded with each other, an initially set thread interference amount (H) being H>2L if an interference amount is required for the thread part, whereby a thread having sufficient tensile and compressive resistance forces can be manufactured easily with a correct working allowance and, particularly in a threaded joint for well pipe having a metal seal part, a reliability can be increased because the sealability thereof is excellent.

L'invention concerne une liaison à filetage conique, caractérisée en ce que le jeu (L¿1?[mm]) entre la face supérieure (1a) d'un filetage mâle chanfreiné (1) et la face inférieure (2b) d'un filetage femelle chanfreiné (2) ou le jeu (L¿2?[mm]) entre la face inférieure (1c) du filetage mâle chanfreiné (1) et la face supérieure (2c) du filetage femelle chanfreiné (2), quel que soit le plus petit (L[mm]) des deux, satisfait à la relation .delta.<=L . (tan.alpha.+tan.beta.), .alpha. étant l'angle de surface de charge (.alpha.[· ]) et .beta. étant l'angle de surface d'insertion (.beta. [· ]), en ce que le jeu axial (.delta. [mm]) produit dans le sens latéral du filetage correspond à la différence entre la largeur au sommet du filetage mâle chanfreiné (1) et la largeur à la base du filetage femelle chanfreiné (2) après vissage, et en ce que l'engagement (H) des filetages initialement défini est tel que H>2L, si un tel engagement est nécessaire pour la partie filetée. Ainsi, il est possible d'une part, de fabriquer facilement un filetage possédant des forces de résistance à la traction et à la compression suffisantes, et ce avec une tolérance d'usinage correcte et d'autre part, notamment dans le cas d'une liaison filetée pour tuyaux de forage à liaison métallique, d'améliorer la fiabilité dudit filetage du fait de ses excellentes propriétés d'étanchéité.

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