Connection structure of dumbell-like shaped bidirectional tapered internal thread having small left taper and large right taper and traditional thread

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

• the connection structure is a connection structure of an internal thread of a dumbbell-like shaped (a left taper smaller than a right taper) asymmetrical bidirectional tapered thread and a traditional thread;
• a complete unit thread of the dumbbell-like shaped (the left taper smaller than the right taper) asymmetrical bidirectional tapered internal thread (6) is a helical dumbbell-like shaped asymmetrical bidirectional tapered hole (41) small in the middle and large in both ends and having a left taper (95) smaller than a right taper (96);
• a thread body of the internal thread (6) is the helical bidirectional tapered hole (41) on an inner surface of a cylindrical body (2), and exists in a form of a “non-entity space”;
• a thread body of the external thread (9) is a helical special tapered body (7) on an outer surface of a columnar body (3) formed by a thread body of the original traditional external thread (9) which is assimilated by the bidirectional tapered internal thread (6) due to cohesive contact with the bidirectional tapered internal thread (6), and exists in the form of a “material entity”;
• a left taper (95) is formed on a left conical surface of the asymmetrical bidirectional tapered internal thread (6) and corresponds to a first taper angle (α1), and a right taper (96) is formed on a right conical surface of the asymmetrical bidirectional tapered internal thread (6) and corresponds to a second taper angle (α2);
• and
• 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 bidirectional tapered hole till an inner conical surface of the bidirectional tapered hole and an outer conical surface of the bidirectional truncated cone body bear each other.