A connection structure of an external thread of an asymmetrical bidirectional tapered thread in an olive-like shape and a traditional screw thread, comprising an internal thread (9) and an external thread (6) in mutual threaded fit, wherein
- a complete unit thread of the symmetric bidirectional tapered external thread (9) in the olive-like shape (93) is a helical asymmetric bidirectional truncated cone body (71) in an olive-like shape (93), with a large middle and two small ends, and with different sizes in a left taper (95) and a right taper (96), and the complete unit thread comprises two taper structure forms in which the left taper (95) is greater than the right taper (96) and the left taper (95) is less than the right taper (96);
- a thread body of the external thread (6) is a helical bidirectional tapered hole (4) in an internal surface of a cylindrical body (2) and exists in the form of a “non-entity space”, and the helical bidirectional tapered hole (4) is assimilated by making a tooth body of the traditional internal thread (6) be in cohesion contact with the bidirectional tapered external thread (9);
- the left taper (95) formed by a left conical surface of the asymmetrical bidirectional tapered external thread (9) corresponds to a first taper angle (α1), and the right taper (96) formed by a right conical surface corresponds to a second taper angle (α2);
- the left taper (95) and the right taper (96) are opposite in direction and different in taper size;
- the internal thread (6) and the external thread (9) are in thread fit to house a cone in the tapered hole until an internal conical surface and an external conical surface mutually bear;
- technical performances mainly depend on the conical surfaces and the taper sizes of the screw thread bodies in mutual fit;
- the left taper (95) is greater than the right taper (96), preferably, the first taper angle (α1) is greater than 0° and less than 53°, and the second taper angle (α2) is greater than 0 and less than 53°;
- and for individual special fields, preferably, the first taper angle (α1) is greater than or equal to 53° and less than 180°;
- and
- the left taper (95) is less than the right taper (96), preferably, the first taper angle (α1) is greater than 0° and less than 53°, and the second taper angle (α2) is greater than 0° and less than 53°;
- and for individual special fields, preferably, the second taper angle (α2) is greater than or equal to 53° and less than 180°.