BIDIRECTIONAL TAPERED THREAD TECHNOLOGY FOR COMBINING TECHNICAL CHARACTERISTICS OF CONE PAIR AND HELIX

Abstract

The present invention belongs to the technical field of device access, and relates to a bidirectional tapered thread technology for combining technical characteristics of a cone pair and a helix, so as to solve the problems of poor self-positioning and self-locking performance of existing threads, wherein an internal thread (6) is a bidirectional tapered hole (41) (non-entity space) in an inner surface of a cylindrical body (2); an external thread (9) is a bidirectional truncated cone body (71) (material entity) on an outer surface of a columnar body (3); and a complete unit thread is a helical bidirectional tapered body in an olive-like shape (93) and in a dumbbell-like (94), and can assimilate the traditional thread matched with the complete unit thread into a special truncated cone body (7) or special tapered hole (4).

Claims

1. A bidirectional tapered thread for combining technical characteristics of a cone pair and a helix, comprising an internal thread (6) and/or an external thread (9), wherein the bidirectional tapered thread (1) comprises a bidirectional tapered hole (41) and/or a bidirectional truncated cone body (71); the bidirectional tapered hole and/or the bidirectional truncated cone body have/has a left taper (95) and a right taper (96) on a surface of a column or a cone; wherein the left taper (95) is same or approximately same as the right taper (96); and/or the left taper (95) is greater than the right taper (96); and/or the left taper (95) is smaller than the right taper (96); the left taper (95) and the right taper (96) have reverse and/or opposite taper directions, and same and/or different tapers; the bidirectional tapered thread is the bidirectional tapered body helically distributed along a helical line continuously and/or discontinuously; a complete unit thread comprises an olive-like shaped bidirectional tapered thread and/or a dumbbell-like shaped bidirectional tapered thread; 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 presented by the bidirectional truncated cone body (71) on an outer surface of a columnar body (3) and in the form of a material entity; the left taper (95) formed by a left conical surface of the bidirectional tapered thread (1) corresponds to a first taper angle (1), and the right taper (96) formed by a right conical surface corresponds to a second taper angle (2); the internal thread (6) and the external thread (9) are in thread fit to 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.

2. The bidirectional tapered thread according to claim 1, wherein in the olive-like shaped bidirectional tapered thread (1), the internal thread (6) comprises a first helical conical surface (421) of the tapered hole, a second helical conical surface (422) of the tapered hole, and an internal helical line (5); a first shape formed by the first helical conical surface (421) of the tapered hole and the second helical conical surface (422) of the tapered hole is the same as a shape of a helical outer flank of a first rotating body, wherein the first rotating body is formed by a first right-angled trapezoid union being rotated around a right-angled side of the first right-angled trapezoid union , and, at the same time, the first right-angled trapezoid union axially moves at a constant speed along a central axis of the cylindrical nut (2); wherein the first right-angled trapezoid union is formed by oppositely jointing two symmetrical lower sides of two right-angled trapezoids; wherein the two right-trapezoids have identical lower sides and upper sides, and same and/or different right-angled sides; wherein the two right-trapezoids are coincident with the central axis of the cylindrical nut (2); the bidirectional tapered external thread (9) comprises a first helical conical surface (721) of the truncated cone body, a second helical conical surface (722) of the truncated cone body, and an external helical line (8); a second shape formed by the first helical conical surface (721) of the truncated cone body and the second helical conical surface (722) of the truncated cone body, is the same as a shape of a helical outer flank of the rotating body, wherein the rotating body is formed by the first right-angled trapezoid union being rotated around the first right-angled side of the first right-angled trapezoid union , and, at the same time, the first right-angled trapezoid union axially moves at constant speed along the central axis of the columnar body (3); wherein the first right-angled trapezoid union is formed by oppositely jointing two symmetrical lower sides of two right-angled trapezoids; wherein the two right-trapezoids have identical lower sides and upper sides, and same and/or different right-angled sides; wherein the two right-trapezoids are coincident with the central axis of the columnar body (3);

3. The bidirectional tapered thread according to claim 1, wherein in the dumbbell-like shaped bidirectional tapered thread, the internal thread (6) comprises a first helical conical surface (421) of the tapered hole, a second helical conical surface (422) of the tapered hole, and an internal helical line (5); a third shape formed by the first helical conical surface (421) of the tapered hole and the second helical conical surface (422) of the tapered hole is the same as a shape of a helical outer flank of a second rotating body; wherein the second rotating body is formed by a second right-angled trapezoid union being rotated around a right-angled side of the second right-angled trapezoid union, and, at the same time, the second right-angled trapezoid union axially moves at a constant speed along the central axis of the cylindrical nut (2); wherein the second right-angled trapezoid union is formed by oppositely jointing two symmetrical upper sides of two right-angled trapezoids; wherein the two right-trapezoids have identical lower sides and upper sides, and same and/or different right-angled sides; wherein the two right-trapezoids are coincident with the central axis of the cylindrical nut (2); the external thread (9) comprises a first helical conical surface (721) of the truncated cone body, a second helical conical surface (722) of the truncated cone body, and an external helical line (8); a fourth shape formed by the first helical conical surface (721) of the truncated cone body and the second helical conical surface (722) of the truncated cone body, is the same as the shape of a helical outer flank of the second rotating body, wherein the second rotating body is formed by the second right-angled trapezoid union being rotated around the right-angled side of the second right-angled trapezoid union, and, at the same time, the second right-angled trapezoid union axially moves at constant speed along the central axis of the columnar body (3); wherein the second right-angled trapezoid union is formed by oppositely jointing two symmetrical upper sides of the two right-angled trapezoids; wherein the two right-trapezoids have identical lower sides and upper sides, and same and/or different right-angled sides; wherein the two right-trapezoids are coincident with the central axis of the columnar body (3).

4. The bidirectional tapered thread according to claim 2, wherein when the right-angled trapezoid union rotates a circle at a constant speed, an axial movement distance of the right-angled trapezoid union is at least double a length of the sum of the right-angled sides of the two right-angled trapezoids of the right-angled trapezoid union.

5. The bidirectional tapered thread according to claim 2, wherein when the right-angled trapezoid union rotates a circle at a constant speed, an axial movement distance of the right-angled trapezoid union is equal to a length of the sum of the right-angled sides of the two right-angled trapezoids of the right-angled trapezoid union.

6. The bidirectional tapered thread according to claim 2, wherein the first helical conical surface (721) of the truncated cone body and the second helical conical surface (722) of the truncated cone body, and the external helical line (8) are continuous helical surfaces or discontinuous helical surfaces; and/or the first helical conical surface (421) of the tapered hole and the second helical conical surface (422) of the tapered hole, and the internal helical line (5) are continuous helical surfaces or discontinuous helical surfaces.

7. The bidirectional tapered thread according to claim 1, wherein the olive-like shaped bidirectional tapered internal thread (6) is formed by oppositely jointing two symmetrical lower sides of two tapered holes, wherein the two tapered holes have identical lower sides and upper sides, and same and/or different taper height; wherein the upper sides of the two tapered holes are located at two ends of the bidirectional tapered holes (41), and are respectively jointed with the upper side of the adjacent bidirectional tapered holes; the dumbbell-like shaped bidirectional tapered internal thread (6) is formed by oppositely jointing two symmetrical upper sides of two tapered holes (3), wherein the two tapered holes have identical lower sides and upper sides, and same and/or different taper height; wherein the lower sides of the two tapered holes are located at two ends of the bidirectional tapered holes (41), and are respectively jointed with the lower sides of the adjacent bidirectional tapered holes; the olive-like shaped bidirectional tapered external thread (9) is formed by oppositely jointing two symmetrical lower sides of two truncated cone bodies, wherein the two truncated cone bodies have identical lower sides and upper sides, and same and/or different taper height; wherein the upper sides of the two truncated cone bodies are located at two ends of the bidirectional truncated cone body (41), and are respectively jointed with the upper side of the adjacent bidirectional truncated cone bodies; the dumbbell-like shaped bidirectional tapered external thread (9) is formed by oppositely jointing two symmetrical upper bottom sides of two truncated cone bodies, wherein the two truncated cone bodies have identical lower sides and upper sides, and same and/or different taper height; wherein the lower sides of the two truncated cone bodies are located at two ends of the bidirectional truncated cone body (41), and are respectively jointed with the lower sides of the adjacent bidirectional truncated cone bodies.

8. The bidirectional tapered thread according to claim 1, wherein a mutual thread fit of the internal thread (6) and the external thread (9) which form the thread connection pair (10) comprises a combination of the olive-like shaped bidirectional tapered threads (1) and/or a combination of the dumbbell-like shaped bidirectional tapered threads (1) (94) and/or a combination of the olive-like shaped bidirectional tapered thread (1) and the dumbbell-like shaped bidirectional tapered threads (1); when a mutual thread fit of a thread connection pair formed by the bidirectional tapered thread and the traditional external and internal threads comprises a combination of the olive-like shaped bidirectional tapered threads (1) and/or a combination of the dumbbell-like shaped bidirectional tapered threads (1) and/or a combination of the olive-lie shaped bidirectional tapered thread (1) and the dumbbell-like shaped bidirectional tapered thread.

9. The bidirectional tapered thread according to claim 1, wherein the bidirectional tapered internal thread (6) and/or the bidirectional tapered external thread (9) have the ability to assimilate traditional threads; the thread body of the external thread (9) is the truncated cone body (7) on the outer surface of the columnar body (3) and is presented in the form of material entity; the thread body of the internal thread (6) is the tapered hole (4) on the inner surface of the cylindrical body (2) and is presented in the form of non-entity space; the traditional threads comprise at least one of triangular threads, trapezoidal threads, sawtooth threads, rectangular threads and arc threads.

10. The bidirectional tapered thread according to claim 1, wherein the bidirectional tapered internal thread (6) and/or the bidirectional tapered external thread (9) may be used solely or combined with machines; wherein the machines comprise non-thread mechanical structures and/or mechanical elements.

11. The bidirectional tapered thread according to claim 1, wherein a pressure formed by the internal thread and the external thread under an external load when the internal thread (6) and external thread (9) form a thread pair (10) depends on the conical surface and the taper size of the thread body and is inversely proportional to a tangent of taper angle of the first taper angle (1) and/or the second taper angle (2).

12. The bidirectional tapered thread according to claim 1, wherein the thread pair (10) is formed by the helical bidirectional tapered hole (41) and the helical bidirectional truncated cone body (71) fit under the guidance of the helical line to form the thread pair (10).

13. The bidirectional tapered thread according to claim 1, wherein the thread pair (10)is formed by the internal cone and the external cone fitted helically with each other and the helical conical contact surface being a bearing surface, and/or till a self-locking generated by a self-positioning contact and/or the interference fit .

14. The bidirectional tapered thread according to claim 1, wherein the bidirectional tapered internal thread (6) and/or the bidirectional tapered external thread (9) comprise that a single-pitch thread body is an incomplete unit thread.

15. The bidirectional tapered thread according to claim 1, wherein the columnar body (3) is solid or hollow, comprising cylindrical and/or non-cylindrical workpieces and objects that need to be machined with the bidirectional tapered external threads (9) on the outer surfaces; the cylindrical body (2) comprises cylindrical and/or non-cylindrical workpieces and objects that need to be machined with the bidirectional tapered internal threads (6) on the inner surfaces; and the outer surfaces and/or inner surfaces comprise cylindrical surfaces and/or non-cylindrical surfaces including conical surfaces.

16. The bidirectional tapered thread according to claim 1, wherein the internal thread (6) and the external thread (9) comprise single-start threads, double-start threads and multi-start threads.

17. The bidirectional tapered thread according to claim 1, wherein the internal thread (6) and the external thread (9) comprise left-hand threads and right-hand threads.

18. The bidirectional tapered thread according to claim 1, wherein when the left taper (95) is same or approximately same with the right taper (96), the first taper angle (1) is greater than 0 and smaller than 53, and the second taper angle (2) is greater than 0 and smaller than 53; when the left taper (95) is greater than the right taper (96), the first taper angle (1) is greater than 0 and smaller than 53, and the second taper angle (2) is greater than 0 and smaller than 53; when the left taper (95) is smaller than the right taper (96), the first taper angle (1) is greater than 0 and smaller than 53 and the second taper angle (2) is greater than 0 and smaller than 53.

19. The bidirectional tapered thread according to claim 17, wherein when the left taper (95) is same or approximately same with the right taper (96), the first taper angle (1) is greater than or equal to 53 and smaller than 180; the second taper angle (2) is greater than or equal to 53 and smaller than 180; when the left taper (95) is greater than the right taper (96), the first taper angle (1) is greater than or equal to 53 and smaller than 180; when the left taper (95) is smaller than the right taper (96), the second taper angle (2) is greater than or equal to 53 and smaller than 180.

Description

DESCRIPTION OF THE DRAWINGS

[0044] FIG. 1 is a structural schematic diagram of a typical thread connection pair of a bidirectional tapered thread technology in Embodiment 1 provided by the present invention; the diagram looks like a structural form of the thread connection pair, but substantially can accurately reflect and include a structural schematic diagram of rich thread pair structure connotation of multiple thread connection pairs in accordance with technical spirit of the present invention, comprising a symmetric bidirectional tapered thread connection pair in an olive-like shape and/or a symmetric bidirectional tapered thread connection pair in a dumbbell-like shape and/or a mixed thread connection pair between symmetric bidirectional tapered external threads in an olive-like shape and symmetric bidirectional tapered internal threads in a dumbbell-like shape and/or a mixed thread connection pair between symmetric bidirectional tapered external threads in a dumbbell-like shape and symmetric bidirectional tapered internal threads in an olive-like shape;

[0045] FIGS. 2A-2B are structural schematic diagrams of an internal thread, an external thread of a bidirectional tapered thread in an olive-like shape and a complete unit thread thereof in Embodiment 1 provided by the present invention; wherein FIG. 2A is the structural schematic diagram of the external thread of the symmetric bidirectional tapered thread in the olive-like shape; FIG. 2B is the structural schematic diagram of the internal thread of the symmetric bidirectional tapered thread in the olive-like shape;

[0046] FIGS. 3A-3B are structural schematic diagrams of an internal thread, an external thread of a symmetric bidirectional tapered thread in a dumbbell-like shape and a complete unit thread thereof in Embodiment 1 provided by the present invention; wherein FIG. 3A is the structural schematic diagram of the external thread of the symmetric bidirectional tapered thread in the dumbbell-like shape; FIG. 3B is the structural schematic diagram of the internal thread of the symmetric bidirectional tapered thread in the dumbbell-like shape;

[0047] FIG. 4 is a relational graph of axial force and counter-axial force of a cone pair in a bidirectional tapered thread technology for combining technical characteristics of a cone pair and a helix provided by the present invention;

[0048] FIG. 5 is a critical relational graph of axial force and counter-axial force of a cone pair comprising achievement of self-positioning and/or self-locking in a bidirectional tapered thread technology for combining technical characteristics of a cone pair and a helix provided by the present invention;

[0049] FIGS. 6A-6B are structural schematic diagrams of an internal thread and an external thread of an asymmetric bidirectional tapered thread in an olive-like shape (a left taper greater than a right taper) and a complete unit thread thereof; wherein FIG. 6A is the structural schematic diagram of the internal thread of the asymmetric bidirectional tapered thread in the olive-like shape (the left taper greater than a right taper); FIG. 6B is the structural schematic diagram of the external thread of the asymmetric bidirectional tapered thread in the olive-like shape (the left taper greater than a right taper).

[0050] FIGS. 7A-7B are structural schematic diagrams of an internal thread and an external thread of a asymmetric bidirectional tapered thread in a dumbbell-like shape (the left taper smaller than the right taper) and a complete unit thread thereof; wherein FIG. 7A is the structural schematic diagram of the internal thread of the asymmetric bidirectional tapered thread in the dumbbell-like shape (the left taper is smaller than the right taper); FIG. 7B is the structural schematic diagram of the external thread of the asymmetric bidirectional tapered thread in the dumbbell-like shape (the left taper is smaller than the right taper);

[0051] FIGS. 8A-8B are structural schematic diagrams of an internal thread and an external thread of the asymmetric bidirectional tapered thread in the olive-like shape (the left taper greater than the right taper) and a complete unit thread thereof according to the present invention; wherein FIG. 8A is the structural schematic diagram of the internal thread of the asymmetric bidirectional tapered thread in the olive-like shape (the left taper greater than the right taper); FIG. 8B is the structural schematic diagram of the external thread of the asymmetric bidirectional tapered thread in the olive-like shape (the left taper greater than the right taper);

[0052] FIGS. 9A-9B are structural schematic diagrams of an internal thread and an external thread of the asymmetric bidirectional tapered thread in the dumbbell-like shape (the left taper smaller than the right taper) and a complete unit thread according to the present invention; wherein FIG. 9A is the structural schematic diagram of the internal thread of the asymmetric bidirectional tapered thread in the dumbbell-like shape (the, left taper smaller than the right taper); FIG. 9B is the structural schematic diagram of the external thread of the asymmetric bidirectional tapered thread in the dumbbell-like shape (the left taper smaller than the right taper);

[0053] FIG. 10 is a structural schematic diagram of a symmetric bidirectional tapered thread connection pair in an olive-like shape in a detail drawing of FIG. 1 according to the present invention;

[0054] FIG. 11 is a structural schematic diagram of a symmetric bidirectional tapered thread connection pair in a dumbbell-like shape in a detail drawing of FIG. 1 according to the present invention;

[0055] FIG. 12 is a structural schematic diagram of a thread connection pair of a mixed combination of a symmetric bidirectional tapered external thread in an olive-like shape and a symmetric bidirectional tapered internal thread in a dumbbell-like shape in a detail drawing of FIG. 1 according to Embodiment 1 of the present invention;

[0056] FIG. 13 is a structural schematic diagram of a thread connection pair of a mixed combination of a symmetric bidirectional tapered external thread in a dumbbell-like shape and a symmetric bidirectional tapered internal thread in an olive-like shape in a detail drawing of FIG. 1 according to Embodiment 1 of the present invention;

[0057] FIG. 14 is a schematic diagram of a connection structure between double nuts comprising a double-nut combined asymmetric bidirectional tapered thread in an olive-like shape (the left taper smaller than the right taper) and an asymmetric bidirectional tapered thread in a dumbbell-like shape (the left taper smaller than the right taper) and a traditional thread bolt

[0058] FIG. 15 is a structural schematic diagram of a nut body asymmetric bidirectional tapered internal thread in an olive-like shape (the left taper greater than the right taper) in FIG. 14 and a complete unit thread thereof according to the present invention;

[0059] FIG. 16 is a structural schematic diagram of a nut body asymmetric bidirectional tapered internal thread in a dumbbell-like shape (the left taper greater than the right taper) in FIG. 14 and a complete unit thread thereof according to the present invention;

[0060] FIG. 17 is a schematic diagram of a connection structure between bolts comprising an asymmetric bidirectional tapered thread in an olive-like shape (the left taper greater than the right taper) and an asymmetric bidirectional tapered thread in a dumbbell-like shape (the left taper greater than the right taper) and a mixed combination of double nuts of the traditional internal thread according to the present invention;

[0061] FIG. 18 is a structural schematic diagram of bolts of two asymmetric bidirectional tapered external threads, i.e., an asymmetric bidirectional tapered external thread in an olive-like shape (the left taper greater than the right taper) and an asymmetric bidirectional tapered external thread in a dumbbell-like shape (the left taper greater than the right taper), and a complete unit thread of the external thread;

[0062] FIG. 19 is a graphic presentation of that the thread of the existing thread technology is an inclined plane on a cylindrical or conical surface involved in the background of the present invention;

[0063] FIG. 20 is a graphic presentation of an inclined plane slider model of the principle of the existing thread technology-the principle of inclined plane involved in the background of the present invention; and

[0064] FIG. 21 is a graphic presentation of a thread rise angle of the existing thread technology involved in the background of the present invention.

[0065] In the figures, tapered thread 1, cylindrical body 2, nut body 21, columnar body 3, screw body 31, tapered hole 4, bidirectional tapered hole 41, conical surface 42 of the tapered hole, first helical conical surface 421 of the tapered hole, first taper angle 1, second helical conical surface 422 of the tapered hole, second taper angle 2, internal helical line 5, internal thread 6, truncated cone body 7, bidirectional truncated cone body 71, conical surface 72 of the truncated cone body, first helical conical surface 721 of the truncated cone body, first taper angle 1, second helical conical surface 722 of the truncated cone body, second taper angle 2, external helical line 8, external thread 9, olive-like shape 93, dumbbell-like shape 94, left taper 95, right taper 96, left-direction distribution 97, right-direction distribution 98, thread connection pair and/or thread pair 10, internal cone body 13, external cone body 14, axial force 15, counter-axial force 16, centripetal force 17, counter-centripetal force 18, external load 19, taper angle , half taper angle , axial force angle 1, counter-axial force angle 2, clearance 101, cone axis 01, thread axis 02, slider A on the inclined surface, inclined surface B, gravity G, gravity component G1 along the inclined plane, friction force F, thread rise angle , equivalent friction angle P, major diameter d of the traditional external thread, minor diameter dl of the traditional external thread and pitch diameter d2 of the traditional external thread.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

[0066] The present invention will be further described in detail below with reference to the accompany drawings and specific embodiments.

Embodiment 1

[0067] As shown in FIGS. 1, 2 and 3 and detail drawings of FIG. 1 comprising FIGS. 10, 11, 12 and 13, a thread connection pair 10 of a bidirectional tapered thread technology comprises a bidirectional truncated cone body 71 helically distributed on an outer surface of a columnar body 3 and a bidirectional tapered hole 41 helically distributed in an inner surface of a cylindrical body 2, namely, comprises an external thread 9 and an internal thread 6 which are in mutual thread fit. The internal thread 6 is distributed as a helical bidirectional tapered hole 41; and the external thread 9 is distributed as a helical bidirectional truncated cone body 71. The internal thread 6 presents the helical bidirectional tapered holes 41 and exists in the form of non-entity space; and the external thread 9 presents the helical bidirectional truncated cone bodies 71 and exists in the form of material entity. The internal thread 6 and the external thread 9 are subjected to a relationship of containing part and contained part as follows: the internal thread 6 and the external thread 9 are fitted together by screwing bidirectional tapered geometries pitch by pitch and cohered till an interference fit is achieved, i.e., the bidirectional tapered hole 41 contains the bidirectional truncated cone body 71 pitch by pitch. The bidirectional containment limits a disordered degree of freedom between the tapered hole 4 and the truncated cone body 7; and the helical movement enables the thread connection pair 10 of the bidirectional tapered thread technology to obtain a necessary ordered degree of freedom.

[0068] When the thread connection pair 10 of the bidirectional tapered thread technology is used, a conical surface 72 of the bidirectional truncated cone body and the conical surface 42 of the bidirectional tapered hole are fitted with each other.

[0069] The thread connection pair 10 of the bidirectional tapered thread technology in the present embodiment has the self-locking and self-positioning performances only if the truncated cone body 7 and/or the tapered hole 4 reaches a certain taper, i.e., cone bodies forming the cone pair reach a certain taper angle. The taper comprises a left taper 95 and a right taper 96. The taper angle comprises a left taper angle and a right taper angle. In the present embodiment, the left taper 95 and the right taper 96 are the same or approximately the same, and the tapered thread comprises a symmetric bidirectional tapered thread 1 having an olive-like shape 93 and a symmetric bidirectional tapered thread 1 having a dumbbell-like shape 94. The left taper 95 corresponds to the left taper angle, i.e., a first taper angle 1.

[0070] It is preferable that the first taper angle 1 is greater than 0 and smaller than 53; and preferably, the first taper angle 1 is 2-40. The right taper 96 corresponds to the right taper angle, i.e., a second taper angle 2. It is preferable that the second taper angle 2 is greater than 0 and smaller than 53; and preferably, the second taper angle 2 is 2-40.

[0071] In individual special fields, i.e., transmission connection application fields without self-locking and/or with low requirements on self-positioning performances and/or in which anti-lock measures are set, t is preferable that the first taper angle 1 is greater than or equal to 53 and smaller than 180, and the second taper angle 2 is greater than or equal to 53 and smaller than 180. It is preferable that the first taper angle 1 is greater than or equal to 53 and smaller than and equal to 90; and the second taper angle 2 is greater than or equal to 53 and smaller than and equal to 90.

[0072] The external thread 9 is arranged on the outer surface of the columnar body 3, wherein the columnar body 3 is provided with a screw body 31; the truncated cone body 7 is helically distributed on the outer surface of the screw body 31; and the truncated cone body 7 comprises the bidirectional truncated cone body 71, which has two structural forms, i.e., one is a special bidirectional tapered geometry in the olive-like shape 93, and the other is a special bidirectional tapered geometry in the dumbbell-like shape 94. The columnar body 3 may be solid or hollow, comprising workpieces and objects like cylinders, cones and tubes that need to be machined with threads on outer surfaces thereof

[0073] The symmetric bidirectional truncated cone body 71 in the olive-like shape 93, i.e., the external thread body, is formed by symmetrically and oppositely jointing lower bottom surfaces of two same truncated cone bodies. The upper top surfaces are located at both ends of the bidirectional truncated cone body 71 to form the symmetric bidirectional tapered thread 1, the process comprises that the lower bottom surfaces are respectively jointed with the upper top surfaces of the adjacent bidirectional truncated cone bodies 71 and/or to be respectively jointed with the upper top surfaces of the adjacent bidirectional truncated cone bodies 71. The external thread 9 comprises a first helical conical surface 721 of the truncated cone body, a second helical conical surface 722 of the truncated cone body and an external helical line 8, which form a symmetric bidirectional tapered external thread 9. In the cross section passing through the thread axis 02, a complete single-pitch symmetric bidirectional tapered external thread 9 is a special bidirectional tapered geometry in the olive-like shape 93 and with a large middle and two small ends. The bidirectional truncated cone bodies 71 include conical surfaces 72 of symmetric bidirectional truncated cone bodies. The angle formed between two plain lines of the left conical surface of the asymmetric bidirectional truncated cone body 71, i.e., the first helical conical surface 721 of the truncated cone body, is the first taper angle 1. The left taper 95 formed on a first helical conical surface 721 of the truncated cone body is subjected to a left-direction distribution 97. The angle formed between the two plain lines of the right conical surface of the asymmetric bidirectional truncated cone body 71, i.e., the second helical conical surface 722 of the truncated cone body, is the second taper angle 2, i.e., the right taper angle corresponding to the right taper 96 of the external thread 9 of the asymmetric bidirectional tapered thread, wherein the right taper 96 is subjected to a right-direction distribution 98. The taper directions corresponding to the first taper angle 1 and the second taper angle 2 are opposite. The plain line is an intersection line of the conical surface and the plane through which the cone axis 01 passes. The shape formed by the first helical conical surface 721 and the second helical conical surface 722 of the truncated cone body of the bidirectional truncated cone body 71 is the same as the shape of a helical outer flank of a rotating body, which circumferentially rotates at a constant speed by using a right-angled side of a right-angled trapezoid union as a rotating center and is formed by two hypotenuses of the right-angled trapezoid union when the right-angled trapezoid union axially moves at a constant speed along a central axis of the columnar body 3, wherein the right-angled side is coincident with the central axis of the columnar body 3; and the right-angled trapezoid union is formed by symmetrically and oppositely jointing lower sides of two same right-angled trapezoids. The right-angled trapezoid union refers to a special geometry, which is formed by symmetrically and oppositely jointing the lower sides of two same right-angled trapezoids and has the upper sides respectively located at both ends of the right-angled trapezoid union.

[0074] The symmetric bidirectional truncated cone body 71 in the dumbbell-like shape 94, i.e., the external thread, is formed by symmetrically and oppositely jointing the upper top surfaces of two same truncated cone bodies, and the lower bottom surfaces are located at both ends of the bidirectional truncated cone body 71 to form the symmetric bidirectional tapered thread 1, comprising that the lower bottom surfaces of the bidirectional truncated cone body 71 are respectively jointed with the lower bottom surfaces of the adjacent bidirectional truncated cone bodies 71 and/or to be respectively jointed with the lower bottom surfaces of the adjacent bidirectional truncated cone bodies 71. The external thread 9 comprises a first helical conical surface 721 of the truncated cone body as well as a second helical conical surface 722 of the truncated cone body and an outer helical line 8 so as to form a symmetric bidirectional tapered external thread 9. In a cross section through which the thread axis 02 passes, a complete single-pitch symmetric bidirectional tapered external thread 9 is a special bidirectional tapered geometry in the dumbbell-like shape 94 small in the middle and large in both end. The symmetric bidirectional truncated cone body 71 comprises a conical surface 72 of the symmetric bidirectional truncated cone body. The angle formed between the two plain lines of the left conical surface of the asymmetric bidirectional truncated cone body 71, i.e., the first helical conical surface 721 of the truncated cone body, is the first taper angle 1. The left taper 95 is formed on the first helical conical surface 721 of the truncated cone body and is subjected to a right-direction distribution 98. The angle formed by the two plain lines of the right conical surface of the symmetric bidirectional truncated cone body 71, i.e., the second helical conical surface 722 of the truncated cone body, is the second taper angle 2. The right taper 96 is formed on the second helical conical surface 722 of the truncated cone body and is subjected to a left-direction distribution 97. The taper directions corresponding to the first taper angle 1 and the second taper angle 2 are opposite. The plain line is an intersection line of the conical surface and the plane through which the cone axis 01 passes. The shape formed by the first helical conical surface 721 and the second helical conical surface 722 of the truncated cone body of the bidirectional truncated cone body 71 is the same as the shape of a helical outer flank of a rotating body, which circumferentially rotates at a constant speed by using a right-angled side of a right-angled trapezoid union as a rotating center and is formed by two hypotenuses of the right-angled trapezoid union when the right-angled trapezoid union axially moves at a constant speed along a central axis of the columnar body 3, wherein the right-angled side is coincident with the central axis of the columnar body 3. The right-angled trapezoid union refers to a special geometry, which is formed by symmetrically and oppositely jointing the upper sides of two same right-angled trapezoids and has the lower sides respectively located at both ends of the right-angled trapezoid union.

[0075] The internal thread 6 is arranged in the inner surface of the cylindrical body 2, wherein the cylindrical body 2 comprises a nut body 21 and a nut body 22; the tapered hole 4 is helically distributed in the inner surfaces of the nut body 21 and the nut body 22; and the tapered hole 4 comprises the symmetric bidirectional tapered holes 41. Each symmetric bidirectional tapered hole 41 has two structural forms, i.e., one is a special bidirectional tapered geometry in the olive-like shape 93, and the other is a special bidirectional tapered geometry in the dumbbell-like shape 94. The cylindrical body 2 comprises cylindrical and/or non-cylindrical workpieces and objects which need to be machined with the internal threads in the inner surfaces.

[0076] The symmetric bidirectional tapered hole 41 in the olive-like shape 93, i.e., the internal thread, is formed by symmetrically and oppositely jointing lower bottom surfaces of two same tapered holes. The upper top surfaces are located at both ends of the bidirectional tapered hole 41 to form the symmetric bidirectional tapered thread 1, the process comprises that the upper top surfaces are respectively jointed with the upper top surfaces of the adjacent bidirectional tapered holes 41 and/or to be respectively jointed with the lower bottom surfaces of the adjacent bidirectional tapered holes 41. The internal thread 6 comprises the first helical conical surface 421 of the tapered hole, the second helical conical surface 421 of the tapered hole and the internal helical line 5, which form the symmetric bidirectional tapered internal thread 6. In the cross section passing through the thread axis 02, the complete single-pitch symmetric bidirectional tapered internal thread 6 is a special bidirectional tapered geometry in the olive-like shape 93 and with a large middle and small large ends. The symmetric bidirectional tapered holes 41 comprises conical surfaces of the symmetric bidirectional tapered holes. The angle formed by the two plain lines of the left conical surface of the bidirectional tapered hole 41, i.e., the first helical conical surface 421 of the tapered hole, is the first taper angle 1. The left taper 95 is formed on the first helical conical surface 421 of the tapered hole and is subjected to the left-direction distribution 97. The angle formed by the two plain lines of the right conical surface of the bidirectional tapered hole 41, i.e., the second helical conical surface 422 of the tapered hole, is the second taper angle 2. The right taper 96 is formed on the second helical conical surface 422 of the tapered hole and is subjected to the right-direction distribution 98. The taper directions corresponding to the first taper angle 1 and the second taper angle 2 are opposite. The plain line is an intersection line of the conical surface and the plane through which the cone axis 01 passes. The shape formed by the first helical conical surface 421 and the second helical conical surface 422 of the tapered hole of the bidirectional tapered hole 41 is the same as the shape of a helical outer flank of a rotating body, which circumferentially rotates at a constant speed by using a right-angled side of a right-angled trapezoid union as a rotating center and is formed by two hypotenuses of the right-angled trapezoid union when the right-angled trapezoid union axially moves at a constant speed along a central axis of the cylindrical body 2, wherein the right-angled side is coincident with the central axis of the cylindrical body 2. The right-angled trapezoid union refers to a special geometry, which is formed by symmetrically and oppositely jointing the lower sides of two same right-angled trapezoids and has the upper sides respectively located at both ends of the right-angled trapezoid union.

[0077] The symmetric bidirectional tapered hole 41 in the dumbbell-like shape 94, i.e., the internal thread, is formed by symmetrically and oppositely jointing the upper top surfaces of two same tapered holes, and the lower bottom surfaces are located at both ends of the bidirectional tapered hole 41 to form the symmetric bidirectional tapered thread 1, comprising that the lower bottom surfaces of the bidirectional tapered hole 41 are respectively jointed with the lower bottom surfaces of the adjacent bidirectional tapered holes 41 and/or to be respectively jointed with the lower bottom surfaces of the adjacent bidirectional tapered holes 41. The internal thread 6 comprises a first helical conical surface 421 of the tapered hole as well as a second helical conical surface 422 of the tapered hole and an inner helical line 5 so as to form the symmetric bidirectional tapered internal thread 6. In the cross section passing through the thread axis 02, the complete single-pitch symmetric bidirectional tapered internal thread 6 is a special bidirectional tapered geometry in the dumbbell-like shape 94 and with a small middle and two large ends. The symmetric bidirectional tapered holes 41 include conical surfaces 42 of the symmetric bidirectional tapered holes. The angle formed between the two plain lines of the left conical surface of the asymmetric bidirectional tapered hole 41, i.e., the first helical conical surface 421 of the tapered hole, is the first taper angle 1. The left taper 95 is formed on the first helical conical surface 421 of the tapered hole and is subjected to a right-direction distribution 98. The angle formed by the two plain lines of the right conical surface of the symmetric bidirectional tapered hole 41, i.e., the second helical conical surface 422 of the tapered hole, is the second taper angle 2. The right taper 96 is formed on the second helical conical surface 422 of the tapered hole and is subjected to a left-direction distribution 97. The taper directions corresponding to the first taper angle 1 and the second taper angle 2 are opposite. The plain line is an intersection line of the conical surface and the plane through which the cone axis 01 passes. The shape formed by the first helical conical surface 421 and the second helical conical surface 422 of the tapered hole of the bidirectional tapered hole 41 is the same as the shape of a helical outer flank of a rotating body, which circumferentially rotates at a constant speed by using a right-angled side of a right-angled trapezoid union as a rotating center and is formed by two hypotenuses of the right-angled trapezoid union when the right-angled trapezoid union axially moves at a constant speed along a central axis of the cylindrical body 2, wherein the right-angled side is coincident with the central axis of the cylindrical body 2. The right-angled trapezoid union refers to a special geometry, which is formed by symmetrically and oppositely jointing the upper sides of two same right-angled trapezoids and has the lower sides respectively located at both ends of the right-angled trapezoid union.

[0078] According to bidirectional tapered thread technology in the present embodiment, the internal thread 6 and the external thread 9 form the thread connection pair 10, i.e., the internal thread 6 and the external thread 9 are in mutual screw-thread fit, comprising: in case of a combination of the bidirectional tapered threads 1 in the olive-like shape 93 and/or a combination of bidirectional tapered threads 1 in the dumbbell-like shape 94 and/or a mixed combination of the bidirectional tapered threads 1 in the olive-like shape 93 and in the dumbbell-like shape 94 and/or a combination of the internal thread with the traditional external thread 9 to form the thread connection pair, the combination comprises a combination of the bidirectional tapered threads 1 in the olive-like shape 93 and/or a combination of the bidirectional tapered threads 1 in the dumbbell-like shape 94 and/or a mixed combination of the bidirectional tapered threads 1 in the olive-like shape 93 and the bidirectional tapered threads 1 in the dumbbell-like shape 94.

[0079] Therefore, the technical performances such as the transmission precision, the transmission efficiency, the load bearing capacity, the locking force of self-locking, the anti-loosening ability, the sealing performance and reusability of the mechanical mechanism using the thread connection pair 10 of the bidirectional tapered thread technology in the present embodiment are related to the sizes of the first helical conical surface 721 of the truncated cone body and the formed left taper 95, i.e., the first taper angle 1, the second helical conical surface 722 of the truncated cone body and the formed right taper 96, i.e., the second taper angle 2, the first helical conical surface 421 of the tapered hole and the formed left taper 95, i.e., the first taper angle 1, as well as the second helical conical surface 422 of the tapered hole and the formed right taper 96, i.e., the second taper angle 2.

[0080] Material friction coefficient, processing quality and application conditions of the columnar body 3 and the cylindrical body 2 also have a certain impact on the cone fit.

[0081] According to the bidirectional tapered thread technology, when the right-angled trapezoid union rotates a circle at a constant speed, the axial movement distance of the right-angled trapezoid union is at least double the length of the sum of the right-angled sides of two same right-angled trapezoids. The structure ensures that the first helical conical surface 721 and the second helical conical surface 722 of the truncated cone body as well as the first helical conical surface 421 and the second helical conical surface 422 of the tapered hole have sufficient length, thereby ensuring that the conical surface 72 of the bidirectional truncated cone body and the conical surface 42 of the bidirectional tapered hole have sufficient effective contact area and strength and the efficiency required by helical movement during fitting.

[0082] According to the bidirectional tapered thread technology, when the right-angled trapezoid union rotates a circle at a constant speed, the axial movement distance of the right-angled trapezoid union is equal to the length of the sum of the right-angled sides of two same right-angled trapezoids. The structure ensures that the first helical conical surface 721 and the second helical conical surface 722 of the truncated cone body as well as the first helical conical surface 421 and the second helical conical surface 422 of the tapered hole have sufficient length, thereby ensuring that the conical surface 72 of the bidirectional truncated cone body and the conical surface 42 of the bidirectional tapered hole have sufficient effective contact area and strength and the efficiency required by helical movement during fitting.

[0083] According to the bidirectional tapered thread technology, the first helical conical surface 721 of the truncated cone body and the second helical conical surface 722 of the truncated cone body are both continuous helical surfaces or discontinuous helical surfaces; and the first helical conical surface 421 of the tapered hole and the second helical conical surface 422 of the tapered hole are both continuous helical surfaces or discontinuous helical surfaces. Preferably, the first helical conical surface 721 of the truncated cone body and the second helical conical surface 722 of the truncated cone body as well as the first helical conical surface 421 of the tapered hole and the second helical conical surface 422 of the tapered hole are all continuous helical surfaces.

[0084] In the thread connection pair 10 of the bidirectional tapered thread technology, one end and/or two ends of the columnar body 3 may be a screw-in end of the cylindrical body 2 connecting hole. By virtue of contact between the first helical conical surface 421 of the internal thread 6 and the first helical conical surface 721 of the external thread 9 and/or interference fit and/or contact between the second helical conical surface 422 of the internal thread 6 and the second helical conical surface 722 of the external thread 9 and/or interference fit, a connecting function of the thread connection pair 10 in the thread technology for combining technical characteristics of the cone pair and the helix is realized.

[0085] In the thread connection pair 10 of the bidirectional tapered thread technology, a head with the size greater than an outer diameter of the columnar body 3 is arranged at one end of the columnar body 3, and/or a head with a size smaller than a minor diameter of the bidirectional tapered external thread 9 of the screw body 31 of the columnar body 3 is arranged at one end and/or two ends of the columnar body 3, wherein the connecting hole is a threaded hole formed in a nut body 21 and the nut body 22. Namely, the columnar body 3 connected with the head is a bolt; and the columnar body having no head and/or having heads at both ends smaller than the minor diameter of the bidirectional tapered external thread 9 and/or having no thread at the middle and having the bidirectional tapered external threads 9 at both ends is a stud, wherein the connecting hole is formed in the nut body 21 and the nut body 22.

[0086] Compared with the prior art, the bidirectional tapered thread technology has the advantages of reasonable design, simple structure, convenient operation, large locking force, high bearing capacity, excellent anti-loosening performance, high transmission efficiency and precision and good mechanical sealing effect, realizes the fastening and connecting functions through sizing of the cone pair formed by the internal cone and the external cone to achieve interference fit, can prevent loosening phenomenon during connection, and has self-locking and self-positioning functions.

[0087] The specific embodiments described herein are merely examples to illustrate the spirit of the present invention. Those skilled in the art of the present invention can make various modifications or supplements to the specific embodiments described or substitute with similar modes without deviating from the spirit of the present invention or going beyond the scope defined by the appended claims.

[0088] The terms such as tapered thread 1, cylindrical body 2, nut body 21, columnar body 3, screw body 31, tapered hole 4, bidirectional tapered hole 41, helical conical surface 42 of the tapered hole, first helical conical surface 421 of the tapered hole, first taper angle 1, second helical conical surface 422 of the tapered hole, second taper angle 2, internal helical line 5, internal thread 6, truncated cone body 7, bidirectional truncated cone body 71, conical surface 72 of the truncated cone body, first helical conical surface 721 of the truncated cone body, first taper angle 1, second helical conical surface 722 of the truncated cone body, second taper angle 2, external helical line 8, external thread 9, olive-like shape 93, dumbbell-like shape 94, left taper 95, right taper 96, left-direction distribution 97, right-direction distribution 98, thread connection pair and/or thread pair 10, clearance 101, self-locking force, self-locking, self-positioning, pressure, cone axis 01, thread axis 02, mirror image, workpiece 130, shaft sleeve, shaft, non-entity space, material entity, single tapered body, double tapered body, cone body, internal cone body 13, tapered hole, external cone body 14, tapered body, cone pair, helical structure, helical movement, complete unit thread, mechanical element, taper angle , half taper angle , axial force 15, axial force angle 1, counter-axial force 16, counter-axial force angle 2, centripetal force 17, counter-centripetal force 18, external load 19, reversely collinear, internal stress, bidirectional force and unidirectional force are widely used, but the possibility of using other terms is not excluded. These terms are merely used to describe and explain the essence of the present invention more conveniently; and it is contrary to the spirit of the present invention to interpret the terms as any additional limitation.