CONNECTION STRUCTURE OF BOLT AND NUT HAVING DUMBELL-LIKE SHAPED ASYMMETRICAL BIDIRECTIONAL TAPERED THREAD

Abstract

The disclosure belongs to the field of general technology of device, and relates to a connection structure of a bolt and a nut having dumbbell-like shaped asymmetrical bidirectional tapered thread, which solves the problem of poor self-positioning and self-locking of existing threads. An internal thread (6) is a bidirectional tapered hole (41) (non-entity space) on an inner surface of, a cylindrical body (2), an external thread (9) is a bidirectional tapered cone body (71) (material entity) on an outer surface of a columnar body (3), and a complete unit thread is a helical dumbbell-like shaped asymmetrical bidirectional tapered body small in the middle and large in both ends and having a left taper (95) greater than and/or small than a right taper (96).

Claims

1. A connection structure of a bolt and a nut having dumbbell-like shaped asymmetrical bidirectional tapered thread, comprising an external thread (9) and an internal thread (6) in mutual thread fit, wherein: a complete unit thread of the dumbbell-like shaped asymmetrical bidirectional tapered thread (1) is a helical dumbbell-like shaped asymmetrical bidirectional tapered body small in the middle and large in both ends and comprising a bidirectional tapered hole (41) and/or a bidirectional truncated cone body (71); the bidirectional tapered hole (41) and/or the bidirectional truncated cone body (71) have/has a left taper (95) and a right taper (96), wherein 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 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 the helical bidirectional truncated cone body (71) on an outer surface of a columnar body (3), and exists in a form of a material entity; the left taper (95) is formed on a left conical surface of the asymmetrical bidirectional tapered body and corresponds to a first taper angle (1), and the right taper (96) is formed on a right conical surface of the asymmetrical bidirectional tapered body and corresponds to a second taper angle (2); 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.

2. The connection structure according to claim 1, wherein the dumbbell-like shaped bidirectional tapered internal thread (6) comprises a left conical surface of a conical surface (42) of the bidirectional tapered hole, i.e., a first helical conical surface (421) of the tapered hole, a right conical surface of the conical surface (42) of the bidirectional tapered hole, i.e., 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, i.e., a bidirectional helical conical surface, is the same as, a shape of a helical outer flank of a first rotating body, wherein the first rotating body is formed by two hypotenuses of a right-angled trapezoid union being rotated around a right-angled side of the right-angled trapezoid union, and, at the same time, the right-angled trapezoid union axially moves at a constant speed along a central axis of the cylindrical body (2); wherein the right-angled trapezoid union is formed by oppositely jointing two asymmetrical upper sides of two right-angled trapezoids; the two right-angled trapezoids have same lower sides and upper sides, but different right-angled sides; and the two right-trapezoids are coincident with the central axis of the cylindrical body (2); the dumbbell-like shaped bidirectional tapered external thread (9) comprises a left conical surface of a conical surface (72) of the bidirectional truncated cone body, i.e., a first helical conical surface (721) of the truncated cone body, a right conical surface of the conical surface (72) of the bidirectional truncated cone body, i.e., a second helical conical surface (722) of the truncated cone body, and an external helical line (8); and 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, i.e., a bidirectional helical conical surface, is the same as a shape of a helical outer flank of a second rotating body, wherein the second rotating body is formed by two hypotenuses of a right-angled trapezoid union being rotated around a right-angled side of the right-angled trapezoid union, and, at the same time, the right-angled trapezoid union axially moves at a constant speed along a central axis of the columnar body (3); wherein the right-angled trapezoid union is formed by oppositely jointing two asymmetrical upper sides of two right-angled trapezoids; the two right-angled trapezoids have same lower sides and upper sides, but different right-angled sides; and the two right-trapezoids are coincident with the central axis of the columnar body (3).

3. The connection structure according to claim 2, 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.

4. The connection structure according to claim 2, 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.

5. The connection structure according to claim 2, wherein the left conical surface and the right conical surface of the bidirectional tapered body, i.e., 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; and the first helical conical surface (721) of the truncated cone body, 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.

6. The connection structure according to claim 1, wherein the internal thread (6) is formed by oppositely jointing two asymmetrical upper sides of two tapered holes (4), wherein the two tapered holes (4) have same, lower sides and upper sides, but different cone heights, and the lower sides of the two tapered holes (4) are located at two ends of the bidirectional tapered hole (41) and are mutually jointed with lower sides of the adjacent bidirectional tapered hole (41); and the external thread (9) is formed by oppositely jointing asymmetrical upper sides of two truncated cone bodies (7), wherein the two truncated cone bodies (7) have same lower sides and upper sides, but different cone heights, and the lower sides of the two truncated cone bodies (7) are located at two ends of the bidirectional truncated cone body (71) and are mutually jointed with lower sides of the adjacent bidirectional truncated cone body (71).

7. The connection pair according to claim 1, wherein the internal thread (6) and the external thread (9) form a thread pair (10); and a contact surface between the first helical conical surface (421) of the tapered hole and the first helical conical surface (721) of the truncated cone body in mutual fit as well as a contact surface between, the second helical conical surface (422) of the tapered hole and the second helical conical surface (722) of the truncated cone body in mutual fit are used as bearing surfaces; an outer diameter of an internal cone and an inner diameter of an external cone are centered under the guidance of the helical line till the conical surface (42) of the bidirectional tapered hole and the conical surface (72) of the bidirectional truncated cone body are cohered till the helical conical surface bears a load in one direction and/or the helical conical surface bears the load in two, directions and/or till self-positioning generated by self-positioning contact and/or interference contact.

8. The connection structure according to claim 1, wherein a screw body (31) of the columnar body (3) is provided with the dumbbell-like shaped asymmetrical bidirectional tapered external thread (9) having the left taper (95) greater than the right taper (96) and/or the dumbbell-like shaped asymmetrical bidirectional tapered external thread (9) having the left taper (95) smaller than the right taper (96); when a connecting hole of the cylindrical body (2) is screwed into in a screw-in end of the columnar body (3), the connecting hole of the cylindrical body (2) is not allowed to be screwed in a reverse direction, the connecting hole is a threaded hole arranged on a nut (21) and a nut (22), and the connecting hole is arranged in the nut (21) and the nut (22); the nut refers to an object comprising a nut with a thread structure on the inner surface of the cylindrical body (2); and when a single nut and/or double nuts and/or multiple nuts of the dumbbell-like shaped asymmetrical bidirectional tapered internal thread (6) of the cylindrical body (2) is/are in mutual thread fit with the dumbbell-like shaped asymmetrical bidirectional, tapered external thread (9) of the screw body (31) of the columnar body (3) for use, the thread of the cylindrical body (2) comprises the dumbbell-like shaped asymmetrical bidirectional tapered internal thread (6) having the left taper (95) greater than the right taper (96) and/or the dumbbell-like shaped asymmetrical bidirectional tapered internal thread (6) having the left taper (95) smaller than the right taper (96).

9. The connection structure according to 8, wherein when one nut is combined with the bolt, i.e., the internal thread (6) and the external thread (9) forming the tapered thread connection pair (10) are cohered together, the other nut is capable of being removed and/or kept, the removed nut is used as an installation process nut, and an internal thread of the installation process nut comprises the bidirectional tapered thread (1), a unidirectional tapered thread and a traditional thread such as a triangular thread, a trapezoidal, thread, a sawtooth thread, a rectangular thread and an arc thread.

10. The connection structure according to claim 1, wherein the internal thread (6) and/or the external thread (9) comprises a single thread body which is an incomplete tapered geometry, that is, the single thread body is an incomplete unit thread.

11. The connection structure according to claim 1, wherein 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; and/or, the first taper angle (1) is greater than or equal to 53 and smaller than 180; and 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; and/or, the second taper angle (2) is greater than or equal to 53 and smaller than 180.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0044] FIG. 1 is a schematic diagram of a connection structure of a bolt and double nuts of a dumbbell-like shaped (a left taper greater than a right taper) asymmetrical bidirectional tapered thread in Embodiment 1 provided by the disclosure.

[0045] FIG. 2 is a schematic diagram of a bolt of an external thread of the dumbbell-like shaped (the left taper greater than the right, taper) asymmetrical bidirectional tapered thread and a complete unit thread of the external thread in Embodiment 1 provided by the disclosure.

[0046] FIG. 3 is a schematic diagram of a bolt of an internal thread of the dumbbell-like shaped (the left taper greater than the right, taper) asymmetrical bidirectional tapered thread and a complete unit thread of the internal thread in Embodiment 1 provided by the disclosure.

[0047] FIG. 4 is a schematic diagram of a connection structure of a bolt and a single nut of a dumbbell-like shaped (a left taper greater than a right taper) asymmetrical bidirectional tapered thread in Embodiment 2 provided by the disclosure.

[0048] FIG. 5 is a schematic diagram of a connection structure of a bolt and double nuts of a dumbbell-like shaped (a left taper greater than a right taper) asymmetrical bidirectional tapered thread, in Embodiment 3 provided by the disclosure.

[0049] FIG. 6 is a schematic diagram of a connection structure of a bolt and double nuts (provided with a spacer like a gasket therebewteen) of the dumbbell-like shaped (the left taper greater than the right taper) asymmetrical bidirectional tapered thread in Embodiment 3 provided by the disclosure.

[0050] FIG. 7 is a schematic diagram of a connection structure of a bolt and double nuts of a dumbbell-like shaped (a left taper smaller than a right taper) asymmetrical bidirectional tapered thread in Embodiment 4 provided by the disclosure.

[0051] FIG. 8 is a schematic diagram of a bolt of an external thread of the dumbbell-like shaped (the left taper smaller than the right taper) asymmetrical bidirectional tapered thread and a complete unit thread of the external thread in Embodiment 4 provided by the disclosure.

[0052] FIG. 9 is a schematic diagram of a bolt of an internal thread of the dumbbell-like shaped (the left taper smaller than the right taper) asymmetrical bidirectional tapered thread and a complete unit thread of the internal thread in Embodiment 4 provided by the disclosure.

[0053] FIG. 10 is a schematic diagram of a connection structure of a bolt of two dumbbell-like shaped asymmetrical bidirectional tapered external threads comprising a dumbbell-like shaped (a left taper smaller than a right taper) asymmetrical bidirectional tapered thread and a dumbbell-like shaped (a left taper greater than a right taper) asymmetrical bidirectional tapered thread and double nuts of the dumbbell-like shaped asymmetrical bidirectional tapered thread provided in Embodiment 5 of the disclosure.

[0054] FIG. 11 is a schematic diagram of a connection structure of a bolt of an external thread of a dumbbell-like shaped asymmetrical bidirectional tapered external thread comprising taper structure forms of the dumbbell-like shape (the left taper smaller than the right taper) and the dumbbell-like shape (the left taper greater than the right taper) on a single screw body and double nuts of the dumbbell-like shaped asymmetrical bidirectional tapered thread and a complete unit thread of the external thread provided in Embodiment 5 of the disclosure.

[0055] FIG. 12 is a schematic diagram of a bolt of an internal thread of the dumbbell-like shaped (the left taper smaller than the right taper) asymmetrical bidirectional tapered thread and a complete unit thread of the internal thread in Embodiment 5 provided by the disclosure.

[0056] FIG. 13 is a schematic diagram of a bolt of an internal thread of the dumbbell-like shaped (the left taper greater than the right taper) asymmetrical bidirectional tapered thread and a complete unit thread of the internal thread in Embodiment 5 provided by the disclosure.

[0057] FIG. 14 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 disclosure.

[0058] FIG. 15 is a graphic presentation of that an inclined plane slider model of the principle of the existing thread technologythe principle of inclined plane involved in the background of the disclosure.

[0059] FIG. 16 is a graphic presentation of a thread rise angle of the existing thread technology involved in the background of the disclosure

[0060] In the figures, tapered thread 1, cylindrical body 2, nut body 21, nut body 22, columnar body 3, screw body 31, slick rod 20, tapered hole 4, bidirectional tapered hole 41, conical surface 42 of the bidirectional 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 bidirectional 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, 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, locking bearing surface 111, locking bearing surface 112, tapered thread bearing surface 122, tapered thread bearing surface 121, workpiece 130, cone axis 01, thread axis 02, slider A on the inclined surface, inclined surface B, gravity (3, 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 d1 of the traditional external thread and pitch diameter d2 of the traditional external thread.

DETAILED DESCRIPTION

[0061] The disclosure will be further described in detail below with reference to the accompany drawings and specific embodiments.

Embodiment 1

[0062] As shown in FIGS. 1 to 3, a connection structure of a bolt and double nuts is adopted in the embodiment, comprising 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 on an inner surface of a cylindrical body 2, i.e., comprises an external thread 9 and an internal thread 6 in mutual thread fit, wherein the internal thread 6 is presented by the helical bidirectional tapered hole 41 and exists in a form of a non-entity space, while the external thread 9 is presented by the helical bidirectional truncated cone body 71 and exists in a form of a material entity. The internal thread 6 and the external thread 9 are in a relationship of a containing part and a contained part: the internal thread 6 and the external thread 9 are sleeved together by screwing bidirectional tapered geometries in pitches and cohered till interference fit. The bidirectional tapered hole 41 contains the bidirectional truncated cone body 71 in pitches. 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 tapered thread connection pair 10 of the bolt and nut having metrical, bidirectional tapered to obtain a necessary ordered degree of freedom, thus effectively combining technical characteristics of a cone pair and, a thread pair.

[0063] According to the bolt and nut having bidirectional tapered thread in the embodiment, the tapered thread connection pair 10 has the self-locking and self-positioning performances only if the truncated cone body 7 and/or the tapered hole, i.e., the cone body forming the cone pair reaches 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 asymmetrical bidirectional tapered thread 1 of the embodiment, the left taper 95 is greater than the right taper 96. The left taper 95 corresponds to the left taper angle, i.e., a first taper angle 1. 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 In individual special fields transmission connection application fields without self-locking and/or with low requirements on self-positioning performances and/or with high requirements on axial bearing capacity, it is preferable that the first taper angle 1 is greater than or equal to 53 and smaller than 180; and preferably, the first taper angle 1 is 53-90. 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.

[0064] 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 an outer surface of the screw body 31, comprising an asymmetrical bidirectional truncated cone body 71. The asymmetrical bidirectional truncated cone body 71 is a dumbbell-like shaped 94 special bidirectional tapered geometry. The columnar body 3 may be solid or hollow, comprising a cylinder, a cone, body, a tubular body, and other workpieces and objects that need to be machined with external threads on outer surfaces thereof.

[0065] The dumbbell-like shaped 94 asymmetrical bidirectional truncated cone body 71 is formed by oppositely jointing two asymmetrical upper sides of two truncated cone bodies, wherein the two tapered holes have same lower sides and upper sides, but different cone heights, and the lower sides of the two truncated cone bodies are located at two ends of the bidirectional truncated cone body 71 and are mutually jointed with the lower sides of the adjacent bidirectional truncated cone body 71 and/or to be mutually jointed with the lower sides of the adjacent bidirectional truncated cone body 71. A conical surface 72 of the asymmetrical bidirectional truncated cone body is arranged on an outer surface of the truncated cone body 7. 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. In a cross section through which the thread axis 02 passes, the complete single-pitch asymmetrical bidirectional tapered external thread 9 is a dumbbell-like shaped 94 special bidirectional tapered geometry small in the middle and large in both ends. Moreover, the taper of the truncated cone body in the left side is greater than the taper of the truncated cone body in the right side. The asymmetrical bidirectional truncated cone body 71 comprises a conical surface 72 of the bidirectional truncated cone body. An angle formed between two plain lines of a left conical surface of the 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. An angle formed between two plain lines of a right conical surface of the asymmetrical 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. A 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 of the bidirectional truncated cone body 71 is the same as a shape of a helical outer flank of a rotating body, wherein the rotating body is formed by two hypotenuses of a right-angled trapezoid union being rotated around a right-angled side of the right-angled trapezoid union, and, at the same time, the right-angled trapezoid union axially moves at a constant speed along a central axis of, the columnar body 3; wherein the right-angled trapezoid union refers to a special geometry formed by oppositely jointing two asymmetrical upper sides of two right-angled trapezoids, the two right-angled trapezoids have same lower sides and upper sides, but different right-angled sides and the lower sides of the two right-angled trapezoids are respectively located at two ends of the right-angled trapezoid union; and the two right-trapezoids are coincident with the central axis of the columnar body 3.

[0066] The internal thread 6 is arranged on the inner surface of the cylindrical body 2, wherein the cylindrical body 2 is provided with a nut body 21 and a nut body 22. A tapered hole 4 is helically distributed on an inner surface of the nut body 21 and an inner surface of the nut body 22 respectively. The tapered hole 4 comprises an asymmetrical bidirectional tapered hole 41. The symmetrical bidirectional tapered hole 41 is a dumbbell-like shaped 94 special bidirectional tapered geometry, and the cylindrical body 2 comprises cylindrical and/or non-cylindrical workpieces and objects that need to be machined with internal threads on inner surfaces thereof.

[0067] The dumbbell-like shaped 94 asymmetrical bidirectional tapered hole 41 is formed by oppositely jointing two asymmetrical upper sides of two tapered holes, wherein the two tapered holes have same lower sides and upper sides but different cone heights, and the lower sides of the two tapered holes are located at two ends of the bidirectional tapered hole 41 and are mutually jointed with the lower sides of the adjacent asymmetrical bidirectional tapered hole 41 and/or to mutually jointed with the lower sides of the adjacent asymmetrical bidirectional tapered hole 41. The tapered hole 4 comprises a conical surface 42 of the asymmetrical bidirectional tapered hole. 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. In a cross section through which the thread axis 02 passes, the complete single-pitch asymmetrical bidirectional tapered internal thread 6 is a dumbbell-like shaped 94 special bidirectional tapered geometry small in the middle and large in both ends, and the taper of the tapered hole in the left side is greater than the taper of the tapered hole in the right side. The bidirectional tapered hole 41 comprises a conical surface 42 of the bidirectional tapered hole. An, angle formed between two plain lines of a 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 a right-direction distribution 98. An angle formed between two plain lines of a 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 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. A shape formed by the first helical conical surface 421 of the tapered hole and the second helical conical surface 422 of the tapered hole of the bidirectional tapered hole 41 is the same as a shape of a helical outer flank of a rotating body, wherein the rotating body is formed by two hypotenuses of a right-angled trapezoid union being rotated around a right-angled side of the right-angled trapezoid union, and, at the same time, the right-angled trapezoid union axially moves at a constant speed along a central axis of the cylindrical body 2; wherein the right-angled trapezoid union refers to a special geometry formed by oppositely jointing two asymmetrical upper sides of two right-angled trapezoids, the two right-angled trapezoids have same lower sides and upper sides, but different right-angled sides and the lower sides of the two right-angled trapezoids are respectively located at two ends of the right-angled trapezoid union; and the two right-trapezoids are coincident with the central axis of the cylindrical body 2.

[0068] A connection structure of a bolt and double nuts is adopted in the embodiment. The double nuts comprise a nut body 21 and a nut body 22. The nut body 21 is located at a left side of the fastened workpiece 130, while the nut body 22 is located at a right side of the fastened workpiece 130. When the bolt and the double nuts are working, a relationship with the fastened workpiece 130 is rigid connection. The rigid connection means that an end surface bearing surface of the nut and a bearing surface of the workpiece 130 are mutually bearing surfaces, comprising a bearing surface 111 and a locking bearing surface 112. The workpiece 130 refers to a connected object comprising the workpiece 130.

[0069] Working bearing surfaces of the thread in the embodiment are different, comprising a tapered thread bearing surface 121 and a tapered thread bearing surface 122. When the cylindrical body 2 is located at a left side of the fastened workpiece 130, i.e., a left end surface of the fastened workpiece 130, and a right end surface of the cylindrical body 2 (i.e., the left nut body 21) is the locking bearing surface 111 between the left nut body 21 and the fastened workpiece 130, the left helical conical surfaces of the bidirectional tapered threads 1 of the left nut body 21 and the columnar body 3 (i.e., the screw body 31), i.e., the bolt, are the tapered thread bearing surfaces. Namely, the first helical conical surface 421 of the tapered hole and the first helical conical surface 721 of the truncated cone body are the tapered thread bearing surface 122; and the first helical conical surface 421 of the tapered hole and the first helical conical surface 721 of the truncated cone body are mutually bearing surfaces. When the cylindrical body 2 is located at a right side of the fastened workpiece 130, i.e., a right end surface of the fastened workpiece 130, and a left end surface of the cylindrical body 2 (i.e., the right nut body 22) is the locking bearing surface 112 between the right nut body 22 and the fastened workpiece 130, the right helical conical surfaces of the bidirectional tapered threads 1 of the right nut body 22 and the columnar body 3 (i.e., the screw body 31), i.e., the bolt, are the tapered thread bearing surfaces. Namely, the second helical conical surface 422 of the tapered hole and the second helical conical surface 722 of the truncated cone body are the tapered thread bearing surfaces 121; and the second helical conical surface 422 of the tapered hole and the second helical conical surface 722 of the truncated cone body are mutually bearing surfaces.

[0070] During transmission connection of the bolt and nut having bidirectional tapered thread, bidirectional bearing is implemented through screwing connection of the bidirectional tapered hole 41 and the bidirectional truncated cone body 71. A clearance 101 between the bidirectional truncated cone body 71 and the bidirectional tapered hole 41 is required. The clearance 101 is beneficial to the formation of the bearing oil film. The tapered thread connection pair 10 is equivalent to a pair of sliding bearings consisting of one pair and/or several pairs of sliding bearings; namely, each pitch of the traditional internal thread 6 bidirectionally contains a corresponding pitch of traditional external thread 9 to form a pair of sliding bearings, A number of the formed sliding bearings is adjusted according to the application conditions, namely, a pitch number of containing and contained threads cohered by the effectively bidirectional jointing, i.e., effectively bidirectional contact of the bidirectional tapered internal thread 6 and the bidirectional tapered external thread 9 is designed according to application conditions. Through the bidirectional containment of the truncated cone body 71 by the tapered hole 4, by virtue of positioning in multiple directions such as radial, axial, angular and circumferential, the precision, efficiency and reliability of the transmission connection of the bidirectional tapered thread are ensured.

[0071] When the bolt and nut having bidirectional tapered thread is tightly connected and hermetically connected, technical performances thereof are realized through the screwing connection of the bidirectional tapered hole 41 and the bidirectional truncated cone body 71, namely, the technical performances are realized through sizing of the first helical conical surface 721 of the truncated cone body and the first helical conical surface 421 of the tapered hole till interference and/or sizing of the second helical conical surface 722 of the truncated cone body and the second helical conical surface 422 of the tapered hole till interference. According to application conditions, one direction bears the load and/or two directions simultaneously respectively bear the load. Namely, under the guidance of the helical line, an outer diameter of an internal cone of the bidirectional truncated cone body 71 and an inner diameter of an external cone of the bidirectional tapered hole 41 are centered till the first helical conical surface 421 of the tapered hole is cohered with the first helical conical surface 721 of the truncated cone body till interference contact and/or the second helical conical surface 422 of the tapered hole is connected with the second helical conical surface 722 of the truncated cone body till interference contact, thus realizing technical performances such as connection, locking, anti-loosening, bearing, fatigue and sealing of mechanical fastening structures.

[0072] Therefore, the technical performances such as the transmission precision and efficiency, the load bearing capacity, the locking force of self-locking, the anti-loosening ability, the sealing performance and the reusability of the bolt and nut having bidirectional tapered thread in the 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, and the second helical conical surface 722 of the truncated cone body and the formed right taper 96, i.e., the second taper angle 2, as well as the sizes of the first helical conical surface 421 of the tapered hole and the formed left taper 95, i.e., the first taper angle 1, and the second helical conical surface 422 of the tapered hole and the formed right taper 96, i.e., the second taper angle 2. 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.

[0073] In the bolt and nut having bidirectional tapered thread, 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, wherein the two right-angled trapezoids have same lower sides and upper sides, but different right-angled sides. The structure ensures that 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, 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.

[0074] In the bolt and nut having bidirectional tapered thread, 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, wherein the two right-angled trapezoids have same lower sides and upper sides, but different right-angled sides. The structure ensures that 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 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.

[0075] In the bolt and nut having bidirectional tapered thread, the first helical conical surface 721 of the truncated cone body and the second helical conical surface 722 of the truncated cone body are continuous helical surfaces or discontinuous helical surfaces. The first helical conical surface 421 of the tapered hole and the second helical conical surface 422 of the tapered hole are continuous helical surfaces or discontinuous helical surfaces.

[0076] In the bolt and nut having bidirectional tapered thread, when a connecting hole of the cylindrical body 2 is screwed into a screw-in end of the columnar body 3, a screw-in direction is required, and the connecting hole cannot be screwed in a reverse direction.

[0077] In the bolt and nut having bidirectional tapered thread, a head with a 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 external thread 9 of the tapered thread of the screw body 31 of the columnar body 3 is arranged at one end and/or two ends of the columnar body 3, and the connecting hole is a threaded hole arranged on the nut body 21. Namely, the columnar body 3 connected with the head herein 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, and the connecting hole is arranged in the nut body 21.

[0078] Compared with the prior art, in the tapered thread connection pair 10 of the connection structure of the bolt and the nut having bidirectional tapered thread 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, good mechanical sealing effect and good stability, realizes the fastening and connecting functions through sizing of the cone pair formed by the internal cone and the external cone until interference fit, can prevent loosening phenomenon during connection, and has self-lockin and self-positioning functions.

Embodiment 2

[0079] As shown in FIG. 4, the structure, principle and implementation steps of the embodiment are similar to that in Embodiment 1, and the differences are that the connection structure of the bolt and the single nut is adopted in the embodiment, and a bolt body is provided with a hexagon head greater than the screw body 31. When the hexagon head of the bolt is located at a left side, the cylindrical body 2 (i.e., the nut body 21), i.e., the single nut is located at a right side of the fastened workpiece 130. When the connection structure of the bolt and the single nut in the embodiment is working, a relationship with the fastened workpiece 130 is rigid connection. The rigid connection means that the end surface of the nut body 21 and the opposite end surface of the workpiece 130 are mutually bearing surfaces. The bearing surface is the locking bearing surface 111, and the workpiece 130 refers to a connected object comprising the workpiece 130.

[0080] The working bearing surface of the thread of the embodiment is the tapered thread bearing surface 122, i.e., the cylindrical body 2, i.e., the nut body 21, i.e., the single nut is located at the right side of the fastened workpiece 130. When the connection structure of the bolt and the single nut is working, a right end surface of the workpiece 130 and a left end surface of the nut body 21 are the locking bearing surface 111 between the nut body 21 and the fastened workpiece 130. Right helical conical surfaces of the bidirectional tapered threads 1 of the nut body 21 and the columnar body 3 (i.e., the screw body 31), i.e., the bolt, are the working bearing surfaces of the thread. Namely, the second helical conical surface 422 of the tapered hole and the second helical conical surface 722 of the truncated cone body are the tapered thread bearing surface 122, and the second helical conical surface 422 of the tapered hole and the second helical conical surface 722 of the truncated cone body are mutually bearing surfaces.

[0081] In the embodiment, when the hexagon head of the bolt is located in the right side, the structure, principle and implementation steps thereof are similar to that in Embodiment 1.

Embodiment 3

[0082] As shown in FIG. 5 and FIG. 6, the structure, principle and implementation steps of the embodiment are similar to that in Embodiment 1, and the differences are that a positional relationship between the double nuts and the fastened workpiece 130 is different. The double nuts comprise the nut body 21 and the nut body 22, and the bolt body has a hexagon head greater than the screw body 31. When the hexagon head of the bolt is located at a left side, both the nut body 21 and the nut body 22 are located at the right side of the fastened workpiece 130. When the connection structure of the bolt and the double nuts is working, a relationship between the nut body 21 and the nut body 22 with the fastened workpiece 130 is non-rigid connection. The non-rigid-connection means that opposite side end surfaces of the nut body 21 and the nut body 22 are mutually bearing surfaces. The bearing surfaces comprise the locking bearing surface 111 and the locking bearing surface 112. The non-rigid connection is mainly applied to non-rigid materials or non-rigid connection workpieces 130 such as transmission pieces and other application fields that need to be installed through double nuts to satisfy requirements, etc. The workpiece 130 refers to a connected object comprising the workpiece 130.

[0083] Working bearing surfaces of the thread of the embodiment are different, comprising the tapered thread bearing surface 121 and the tapered thread bearing surface 122. When the cylindrical body 2 comprises the left nut body 21 and the right nut body 22, a right end surface of the left nut body 21, i.e., the locking bearing surface 111 and a left end surface of the right nut body 22 i.e., the locking bearing surface 112 are oppositely and directly connected and are mutually locking bearing surfaces. When the right end surface of the left nut body 21 is the locking bearing surface 111, the left helical conical surfaces of the bidirectional tapered threads 1 of the left nut body 21 and the columnar body 3 (i.e., the screw body 31), i.e., the bolt, are the working bearing surfaces of the thread. Namely, the first helical conical surface 421 of the tapered hole and the first helical conical surface 721 of the truncated cone body are the tapered thread bearing surface 122, and the first helical conical surface 421 of the tapered hole and the first helical conical surface 721 of the truncated cone body are mutually bearing surfaces. When the left end surface of the right nut body 22 is the locking bearing surface 112, the right helical conical surfaces of the bidirectional tapered threads 1 of the right nut body 22 and the columnar body 3 (i.e., the screw body 31), i.e., the bolt, are the working bearing surfaces of the thread. Namely, the second helical conical surface 422 of the tapered hole and the second helical conical surface 722 of the truncated cone body are the tapered thread bearing surface 121 and the second helical conical surface 422 of the tapered hole and the second helical conical surface 722 of the truncated cone body are mutually bearing surfaces.

[0084] In the embodiment, when the cylindrical body 2 located inside, i.e., the nut body 21 adjacent with the fastened workpiece 130 is already effectively combined together with the columnar body 3 (i.e., screw body 31), i.e., the bolt, namely, the internal thread 6 and the external thread 9 forming the tapered thread connection pair 10 are effectively cohered together, the cylindrical body 2 located outside, i.e., the nut body 22 not adjacent with the fastened workpiece 130 may keep an original situation and/or be dismounted with one nut (for example, such application fields having lightweight requirements on equipment or not needing double nuts to ensure the reliability of the connection technology) according to application conditions. The dismounted nut body 22 is not used as a connection nut, but only used as an installation process nut. An internal thread of the installation process nut is not only manufactured by adopting bidirectional tapered threads, and may also be a nut body 22 made of unidirectional tapered threads and other threads that can be screwed with the tapered threads 1, i.e., threads comprising triangular threads, trapezoidal threads, sawtooth threads and other non-tapered threads, but are not limited to the above threads. On the premise of ensuring the reliability of the connection technology, the tapered thread connection pair 10 is a closed-loop fastening technical system, namely, after the internal thread 6 and the external thread 9 of the tapered thread connection pair 10 are effectively cohered together, the tapered thread connection pair 10 will become an independent technical system without relying on technical compensations from a third party to ensure the technical effectiveness of the connection technical system. The effectiveness of the tapered thread connection pair 10 will not be affected even without the support of other objects and even if there is a gap between the tapered thread connection pair 10 and the fastened workpiece 130. This will greatly reduce the weight of the equipment, remove invalid loads, and improve the technical requirements on an effective loading capability, braking performance, and energy conservation and emission reduction of the equipment, which is a unique thread technical advantage no matter the relationship between the tapered thread connection pair 10 of the connection structure of the bolt and the nut having bidirectional tapered thread and the fastened workpiece 130 is non-rigid connection or rigid connection, and is not possessed by other thread technologies.

[0085] In the embodiments, when a gasket is provided between the nut body 21 and the nut body 22, the structure, principle and implementation steps thereof are similar to that in Embodiment 1.

[0086] In the embodiment, when the hexagon head of the bolt is located at the right side, then both the nut body 21 and the nut body 22 are located at the left side of the fastened workpiece 130, and the structure, principle and implementation steps thereof are similar to that in Embodiment 1.

Embodiment 4

[0087] As shown in FIG. 7, FIG. 8 and FIG. 9, the structure, principle and implementation steps of the embodiment are similar to that in Embodiment 1, Embodiment 2 and Embodiment 3, and the differences are that the left taper 95 of the asymmetrical bidirectional tapered thread 1 in the embodiment is smaller than the right taper 96. 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. 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. In individual special fields, it is preferable that the second taper angle 2 is greater than or equal to 53 and smaller than 180; and preferably, the second taper angle 2 is 53-90.

Embodiment 5

[0088] As shown in FIG. 10, FIG. 11, FIG. 12 and FIG. 13, the structure, principle and implementation steps of the embodiment are similar to that in Embodiment 1 and Embodiment 4, and the differences are, that the screw body 31 on the columnar body 3 comprises two thread structures of the dumbbell-like shaped 94 asymmetrical bidirectional tapered thread 1, namely, the asymmetrical bidirectional tapered thread 1 of the screw body 31 refers to the external threads 9 of the dumbbell-like shaped 94 asymmetrical bidirectional tapered threads in two structural forms comprising that the left taper 95 is smaller than the right taper 96 and the left taper 95 is greater than the a right taper 96. A thread section of the screw body 31 located at a left side of a slick rod 20, i.e., a non-thread section, is the dumbbell-like shaped 94 asymmetrical bidirectional tapered external thread 9 having the left taper 95 smaller than the right taper 96. Namely, the thread section of the external thread 9 in mutual thread fit with the cylindrical body 2 located at the left side of the workpiece 130, i.e., the nut body 21 is the dumbbell-like shaped 94 asymmetrical bidirectional tapered external thread 9 having the left taper 95 smaller than the right taper 96. A thread section of the screw body 31 located at a right side of the slick rod 20, i.e., a non-thread section, is the dumbbell-like shaped 94 asymmetrical bidirectional tapered external thread 9 having the left taper 95 greater than the right taper 96. Namely, the thread section of the external thread 9 in mutual thread fit with the cylindrical body 2 located at the right side of the workpiece 130, i.e., the nut body 22 is the dumbbell-like shaped 94 asymmetrical bidirectional tapered external thread 9 having the left taper 95 greater than the right taper 96.

[0089] In the embodiment, the following structure may also be adopted, comprising that the cylindrical body 2 located at the left side of the workpiece 130 i.e., the internal thread 6 of the nut body 21 is the dumbbell-like shaped 94 asymmetrical bidirectional tapered internal thread 6 having the left taper 95 greater than the right taper 96, and the cylindrical body 2 located at the right side of the workpiece 130, i.e., the internal thread 6 of the nut body 22 is the dumbbell-like shaped 94 asymmetrical bidirectional tapered internal thread 6 having the left taper 95 smaller than the right taper 96. Accordingly, the dumbbell-like shaped 94 asymmetrical bidirectional tapered thread 1 of the screw body 31 of the columnar body 3 will also comprise the dumbbell-like shaped 94 asymmetrical bidirectional tapered external threads 9 in two types of taper structure forms, i.e., the thread section of the screw body 31 located at the left side of the slick rod 20, i.e., the non-thread section, is the dumbbell-like shaped 94 asymmetrical bidirectional tapered external thread 9 having the left taper 95 greater than the right taper 96, and the thread section of the screw body 31 located at the right side of the slick rod 20, i.e., the non-thread section, is the dumbbell-like shaped 94 asymmetrical bidirectional tapered external thread 9 having the left taper 95 smaller than the right taper 96. Namely, the thread section of the external thread 9 at the left side of the screw body 31 in mutual thread fit with the nut body 21 is the dumbbell-like shaped 94 asymmetrical bidirectional tapered external thread 9 having the left taper 95 greater than the right taper 96, and the thread section of the external thread 9 at the right side of the screw body 31 in mutual thread fit with the nut body 22 is the dumbbell-like shaped 94 asymmetrical bidirectional tapered external thread having the left taper 95 smaller than the right taper 96. The structure, principle and implementation steps of the embodiment are similar to that of Embodiment 1 and Embodiment 4.

[0090] The combination of the bolt and the double nuts above adopts any combination form which shall be determined on the application requirements.

[0091] The specific embodiments described herein are merely examples to illustrate the spirit of the disclosure. Those skilled in the art of the disclosure can make various modifications or supplements to the specific embodiments described or substitute with similar modes without deviating from the spirit of the disclosure or going beyond the scope defined by the appended claims.

[0092] The terms such as tapered thread 1, cylindrical body 2, nut body 21, nut body 22, columnar body 3, screw body 31, slick rod 20, tapered hole 4, bidirectional tapered hole 41, conical surface 42 of the bidirectional 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 1, internal helical line 5, internal thread 6, truncated cone body 7, bidirectional truncated cone body 71, conical surface 72 of the bidirectional 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, 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, shaft sleeve, shaft, non-entity space, material entity, single tapered body, double tapered body, cone body, internal cone body, tapered hole, external cone body, tapered body, cone pair, helical structure, helical movement, thread body, complete unit thread, axial force, axial force angle, counter-axial force, counter-axial force angle, centripetal force, counter-centripetal force, inversely collinear, internal stress, bidirectional force, unidirectional force, sliding bearing, sliding bearing pair 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 disclosure more conveniently; and it is contrary to the spirit of the disclosure to interpret the terms as any additional limitation.