Connection structure of external thread of dumbell-like shaped asymmetrical bidirectional tapered thread and traditional thread

A connection structure of an external thread of a dumbbell-like shaped asymmetrical bidirectional tapered thread and a traditional thread, comprising an internal thread (6) and an external thread (9) in mutual thread fit, wherein:

• a complete unit thread of the dumbbell-like shaped asymmetrical bidirectional tapered external thread (9) is a helical dumbbell-like shaped asymmetrical bidirectional truncated cone body (71) small in the middle and large in both ends and having a left taper (95) different from a right taper (96);
• the left taper (95) is greater than the right taper (96) and/or the left taper (95) is smaller than the right taper (96);
• a thread body of the external thread (9) is the helical bidirectional tapered hole (71) on an outer surface of a columnar body (3), and exists in a form of a “material entity”;
• a thread body of the internal thread (6) is a helical special tapered hole (4) on an inner surface of a cylindrical body (2) formed by a tooth body of the original traditional internal thread (6) which is assimilated by the bidirectional tapered external thread (9) due to cohesive contact with the bidirectional tapered external thread (9), and exists in a form of a “non-entity space”;
• the left taper (95) is formed on a left conical surface of the asymmetrical bidirectional tapered external thread (9) and corresponds to a first taper angle (α1), and the right taper (96) is formed on a right conical surface of the asymmetrical bidirectional tapered external thread (9) and corresponds to a second taper angle (α2);
• the left taper (95) and the right taper (96) have opposite directions, and different tapers;
• and
• the internal thread (6) and the external thread (9) contain the bidirectional truncated cone body by the special tapered hole till an inner conical surface of the special tapered hole and an outer conical surface of the truncated cone body bear each other.