CONNECTION STRUCTURE OF BOLT AND NUT WITH DUMBBELL SHAPE BIDIRECTIONAL TAPERED THREAD HAVING SMALL LEFT TAPER AND LARGE RIGHT TAPER

Abstract

The disclosure relates to the general technology of devices, and in particular relates to a connection structure of bolt and nut with dumbbell shape bidirectional tapered thread having small left and large right taper. The disclosure solves the problems of poor self-positioning and poor self-locking of existing thread. The disclosure is characterized that an internal thread (6) is a bidirectional tapered hole (41) in an inner surface of a cylindrical body (2) (non-solid space) and an external thread (9) is a bidirectional truncated cone body (71) in an the outer surface of a columnar body (3) (material entity), and each of the complete unit threads thereof is a dumbbell-like shape (94) bidirectional conical body with a left-side taper (95) smaller than a right-side taper (96) in the form of a helical and having a small middle and two large ends.

Claims

1. A connection structure of bolt and nut with dumbbell-like shape (a left taper is smaller than a right taper) bidirectional tapered thread, that is, a connection structure of bolt and nut with dumbbell-like shape (a left taper is smaller than a right taper) asymmetric bidirectional tapered thread, comprising an external thread(9) and an internal thread(6) threaded with each other, wherein a complete unit thread of the dumbbell-like shape (the left taper is smaller than the right taper) asymmetric bidirectional tapered thread is a helical dumbbell-like shape (94) bidirectional cone with small middle and big ends, and the left taper (95) the is smaller than the right taper (96); the above-mentioned complete unit thread comprises a bidirectional tapered hole (41) and a bidirectional truncated cone body (71); a threaded body of the internal thread (6) is an inner surface of a cylindrical body (2) presenting as a helical bidirectional tapered hole (41) and exists in a form of non-solid space; a threaded body of the external thread (9) is an outer surface of a columnar body (3) presenting as the helical bidirectional truncated cone body (71) and exists in a form of material entity; for the above-mentioned asymmetric bidirectional cone, the left conical surface forms the left taper (95) corresponding to the first taper angle (1), the right conical surface forms the right taper (96) corresponding to the second taper angle (2); the left taper (95) and right taper (96) are opposite and the taper is different; the above-mentioned internal thread (6) and external thread (9) bear each other by the tapered hole enclosing the cone; the technical performance mainly depends on the matching conical surfaces of threaded body and taper; preferably, 0<the first taper angle (1)<53), 0<the second taper angle (2)<53, for individual special fields, preferably, 53the second taper angle (2)<180.

2. The connection structure according to claim 1, wherein the dumbbell-like shape (94) bidirectional 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).

3. The connection structure 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.

4. The connection structure 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.

5. The connection structure according to claim 1, wherein 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/or 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.

6. The connection structure according to claim 1, wherein the 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 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.

7. The connection structure according to claim 1, wherein the first helical cone surface of the tapered hole (421) and the second helical cone surface of the tapered hole (422), with the matching first helical cone surface of the truncated cone body (721) and matching second helical cone surface of the truncated cone body (722) take the contact surface as the supporting surface; under the guidance of the helical line, the inner and outer diameters of the inner cone and the outer cone of the thread pair (10) composed of the internal thread (6) and the external thread (9) are centered until the bidirectional tapered hole cone surface (42) and the bidirectional truncated cone body cone surface (72) are entangled so that the helical conical surface is loaded in one direction and/or two directions at the same time and/or until the sizing self-positioning contact and/or until the sizing interference contact producing self-locking.

8. The connection structure according to claim 1, wherein the connection structure of bolt and double nuts is provided with the nuts located on the left and right sides of the fastened workpiece and/or the connection structure of bolt and single nuts is provided with the single nut (21) located on the left or right side of the fastened workpiece, and/or the nuts located on the left and right sides of the fastened workpiece when the connection structure of bolt and double nuts is provided; when a nut has been effectively combined with the bolt, that is, when the internal thread (6) and the external thread (9) forming the tapered threaded connection pair (10) are effectively entangled together, the other nut can be removed and/or retained; the nut removed is used as an installation process nut; its internal thread comprises the bidirectional tapered thread (1), one-way tapered thread, triangular thread, trapezoidal thread, sawtooth thread, rectangular thread, circular arc thread and others; these traditional threads meets the technical spirit of the present disclosure only when they are threaded to match the above-mentioned bidirectional conical external thread (9).

9. The connection structure according to claim 1, wherein when the cylindrical body (2) connecting hole is screwed into the screw-in end of the columnar body (3), there is a screw-in direction requirement, that is, the cylindrical body (2) connecting hole cannot be rotated in the opposite direction into the screw-in end of the columnar body (3); the connecting hole is a threaded hole set on the nut body (21) and the nut body (22); the connecting hole is set in the nut body (21) and the nut body (22); the nut refers to a object such as nut body whose the inner surface of the cylindrical body (2) has a threaded structure on including such as nut.

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

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0044] FIG. 1 is a schematic diagram of a connection structure of a bolt and double nuts with a dumbbell-like shape (the taper on the left is smaller than the taper on the right) asymmetric bidirectional tapered thread according to embodiment 1 of the present disclosure.

[0045] FIG. 2 is a schematic diagram of the bolt with the external thread of the dumbbell-like shape (the taper on the left is smaller than the taper on the right) bidirectional tapered thread and the complete unit thread of external thread according to the embodiment 1 of the present disclosure.

[0046] FIG. 3 is a schematic diagram of the bolt with the internal thread of the dumbbell-like shape (the taper on the left is smaller than the taper on the right) bidirectional tapered thread and the complete unit thread of internal thread according to the embodiment 1 of the present disclosure.

[0047] FIG. 4 is a schematic diagram of a connection structure of a bolt and a single nut with a dumbbell-like shape (the taper on the left is smaller than the taper on the right) asymmetric bidirectional tapered thread according to embodiment 2 of the present disclosure.

[0048] FIG. 5 is a schematic diagram of a connection structure of a bolt and double nuts with a dumbbell-like shape (the taper on the left is smaller than the taper on the right) asymmetric bidirectional tapered thread according to embodiment 3 of the present disclosure.

[0049] FIG. 6 is a schematic diagram of a connection structure of a bolt and double nuts (there is a washer between the double nuts) with a dumbbell-like shape (the taper on the left is smaller than the taper on the right) asymmetric bidirectional tapered thread according to embodiment 4 of the present disclosure.

[0050] FIG. 7 is an illustration of the thread of the existing thread technology is an inclined plane on a cylindrical or conical surface involved in the background technology of the present disclosure.

[0051] FIG. 8 is an illustration of the an inclined plane slider model of the principle of the existing thread technologythe principle of inclined plane involved in the background technology of the present disclosure.

[0052] FIG. 9 is an illustration of the a thread rise angle of the existing thread technology involved in the background technology of the present disclosure.

[0053] In the figure, tapered thread 1, cylindrical body 2, nut body 21, nut body 22, columnar body 3, screw body 31, tapered hole 4, bidirectional tapered hole 41, bidirectional conical surface 42 of the tapered hole, first helical conical surface 421 of the tapered hole, first taper angle 1, second helical cone surface of the tapered hole 422, 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 cone surface of the truncated cone body 721, first taper angle 1, first helical conical surface 721 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 supporting surface 111, locking supporting surface 112, tapered thread supporting surface 122, tapered thread supporting surface 121, workpiece 130, nut body locking direction 131, washer 132, cone axis 01, thread axis 02, slider A on the inclined surface, inclined surface B, gravity G, gravity component Gi along the inclined surface component, friction force F, thread rise angle , equivalent friction angle P, major diameter d of traditional external thread, small diameter d1 of traditional external thread, pitch diameter d2 of traditional external thread.

DETAILED DESCRIPTION OF EMBODIMENTS

[0054] The present disclosure will be further described in detail below with reference to the drawings and specific embodiments.

Embodiment 1

[0055] As shown in FIG. 1, FIG. 2, and FIG. 3, the present embodiment adopts the connection structure of a bolt and double nut 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. This effectively synthesizes the technical characteristics of the cone pair and the thread pair.

[0056] For the bolt and nut with bidirectional tapered thread in this embodiment, the thread connection pair 10 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 an asymmetric bidirectional tapered thread 1 having an olive-like shape 93 and an asymmetric 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. 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. 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 530 and smaller than and equal to 90; and the second taper angle 2 is greater than or equal to 530 and smaller than and equal to 90.

[0057] 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 asymmetric bidirectional truncated cone body 71. The asymmetric bidirectional truncated cone body 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.

[0058] The asymmetric 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 asymmetric 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 an asymmetric bidirectional tapered external thread 9. In a cross section through which the thread axis 02 passes, a complete single-pitch asymmetric 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 ends. The asymmetric bidirectional truncated cone body 71 comprises a conical surface 72 of the asymmetric 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 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. 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.

[0059] 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 asymmetric bidirectional tapered holes 41. The cone hole 4 includes the asymmetric bidirectional cone hole 41. The asymmetric bidirectional cone hole 41 is a special dumbbell-like shape 94 bidirectional cone geometry. 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.

[0060] The asymmetric 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 asymmetric 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 asymmetric bidirectional tapered internal thread 6. In the cross section passing through the thread axis 02, the complete single-pitch asymmetric 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 asymmetric bidirectional tapered holes 41 include conical surfaces 42 of the asymmetric 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 asymmetric 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.

[0061] This embodiment adopts the connection structure of a bolt and double nuts. The double nuts include a nut body 21 and a nut body 22. The nut body 21 is located on the left side of the fastened workpiece 130, and the nut body 22 is located on the right side of the fastened workpiece 130. When the bolt and the double nuts works, the relationship with the workpiece 130 to be fastened is a rigid connection. The rigid connection means that the end face supporting surface of nuts and supporting surface of the workpiece 130 are mutually supporting surfaces, including the locking supporting surface 111 and the locking supporting surface 112. The workpiece 130 refers to the connected object including the workpiece 130.

[0062] The working supporting surface of the thread in the embodiment is different, including the tapered thread support surface 121 and the tapered thread supporting surface 122. When the cylindrical body 2 is located on the left of the fastened workpiece130, that is, when the left end face of the fastened workpiece 130 and the right end face of the cylindrical body2, that is, the left nut body 21 are locking supporting surface 111 of the left nut body 21 and the fastened workpiece 130, the left helical conical surface of the bidirectional tapered thread 1 of the left nut body 21 and columnar body 3, that is, the bolt body 31 or bolt, is the thread working supporting surface. In other words, the first conical surface of the tapered hole 421 and the first helical conical surface of the truncated cone body 721 are the supporting surface of the tapered thread 122. The first conical surface of the tapered hole 421 and the first helical conical surface of the truncated cone body 721 are mutually the supporting surfaces. When the cylindrical body 2 is located on the right of the fastened workpiece130, that is, when the right end face of the fastened workpiece 130 and the left end face of the cylindrical body2, that is, the right nut body 22 are locking supporting surface 112 of the right nut body 22 and the fastened workpiece 130, the right helical conical surface of the bidirectional tapered thread 1 of the right nut body 22 and columnar body 3, that is, the bolt body 31 or bolt, is the thread working supporting surface. In other words, the second conical surface of the tapered hole 422 and the second helical conical surface of the truncated cone body 722 are the supporting surface of the tapered thread 121. The second conical surface of the tapered hole 422 and the second helical conical surface of the truncated cone body 722 are mutually the supporting surfaces.

[0063] The bolt and nut with bidirectional tapered thread are connected in transmission through the screw connection of the bidirectional tapered hole 41 and the bidirectional truncated cone body 71, and the load is bidirectional. When the external thread 9 and the internal thread 6 form a thread pair 10, there must be a clearance 101 between the bidirectional truncated cone body 71 and the bidirectional tapered hole 41. If oil and other media are lubricated between the internal thread 6 and the external thread 9, it will easily form a bearing oil film. The clearance is conducive to the formation of the bearing oil film. The tapered thread connection pair, are equivalent to a group of sliding bearing pairs composed of one pair and/or several pairs of sliding bearings. In other words, each section of bidirectional conical internal thread 6 bidirectionally contains a corresponding section of bidirectional conical external thread 9 to form a pair of sliding bearing, and the number of sliding bearings composed is adjusted according to the application conditions. In other words, thread pitches of the effective bidirectional joint of the bidirectional conical internal thread 6 and the bidirectional conical external thread 9, that is, the effective contact envelopment of the containment and contained, should be designed according to the application conditions. By the bidirectional tapered hole 4 containing the bidirectional truncated cone body 7, radial, axial, angular, circumferential and so on, the multi-directional positioning is achieved. This produces a special composite technology of the cone pair and the thread pair to ensure the tapered thread technology, especially transmission connection accuracy, efficiency and reliability of the connection structure of bolt and nut with bidirectional tapered thread.

[0064] For the bolt and nut with bidirectional tapered thread, the fastened and sealed technical performance is realized by the screw connection of the bidirectional tapered hole 41 and the bidirectional truncated cone body 71, that is, by the first helical conical surface of the tapered hole 721 and the first helical conical surface of the truncated cone body 421 sizing interference and/or the second helical conical surface of the tapered hole 722 and the second helical conical surface of the truncated cone body 422 sizing interference. According to the application conditions, loading in one direction and/or loading in two directions simultaneously is achieved. That is, with the bidirectional truncated cone body 71 and the bidirectional tapered hole 41 guided by the helical line, the inner and outer diameters of inner and outer cone are centered until the first helical conical surface of the tapered hole 421 encloses the first helical conical surface of the truncated cone body 721 to achieve loading in one direction or in two directions at the same time sizing cooperation or until sizing interference contact. Thereby, to the technical performance of mechanical mechanism connection, locking, anti-loosening, bearing, fatigue and sealing is achieved.

[0065] Therefore, for the bolt and nut with bidirectional tapered thread in this embodiment, the technical performance of transmission accuracy and efficiency, bearing capacity, self-locking locking force, anti-loosening capacity, and sealing is related to the first helical conical surface of the truncated cone body 721 and its left taper 95, that is, the first taper angle 1, the second helical conical surface of the truncated cone body 722 and its right taper 96, that is, the second taper angle 2, the first helical conical surface of the tapered hole 421 and its left taper 95, that is, the first taper angle 1, and the second helical conical surface of the tapered hole 422 and its right taper 96, that is, the second taper angle 2. The material friction coefficient, processing quality and application conditions of the columnar body 3 and the cylindrical body 2 also have a certain influence on the cone fit.

[0066] For the above-mentioned bolt and nut with bidirectional tapered thread, 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.

[0067] For the above-mentioned bolt and nut with bidirectional tapered thread, 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.

[0068] For the above-mentioned bolt and nut with bidirectional tapered thread, the first helical conical surface of the truncated cone body 721 and the second helical conical surface of the truncated cone body 722 are both continuous helical surfaces or discontinuous helical surfaces; The first helical conical surface of the tapered hole 421 and the second helical conical surface of the tapered hole 422 are both continuous helical surfaces or discontinuous helical surfaces.

[0069] For the above-mentioned bolt and nut with bidirectional tapered thread, when the cylindrical body 2 connecting hole is screwed into the screw-in end of the columnar body 3, there is a screw-in direction requirement, that is, the cylindrical body connecting hole cannot be rotated in the opposite direction into the screw-in end of the columnar body 2.

[0070] For the above-mentioned bolt and nut with bidirectional tapered thread, one end of the columnar body 3 is provided with a head having a size larger than the outer diameter of the columnar body 3, and/or one and/or both ends of the columnar body 3 are provided with a head having a size smaller than the small diameter of the external tapered thread 9 of the columnar body 3 screw body 31. The connecting hole is a threaded hole provided in the nut body 21. That is to say, the columnar body 3 and the head are connected as bolt. The columnar body without the head, and/or the columnar body with the heads at both ends which are smaller than the small diameter of the bidirectional external tapered thread, and/or the columnar body with no-thread in the middle and bidirectional external tapered threads at both ends are the studs. The connecting hole is arranged in the nut body 21.

[0071] Compared with the existing technology, the advantages of the conical connection pair 10 with the connection structure of bolt and nut with bidirectional tapered thread are: reasonable design, simple structure, the function of fastening and connection realized by the bidirectional load-bearing of cone pair which is formed by the inner and outer coaxial diameters positioning of the inner and outer cone or sizing interference cooperation, convenient operation, large locking force, large bearing value, good anti-loosening performance, high transmission efficiency and precision, good mechanical sealing effect, good stability, prevention of loose phenomenon of connection, and self-locking and self-positioning functions.

Embodiment 2

[0072] As shown in FIG. 4, the structure, principle, and implementation steps of this embodiment are similar to those of Embodiment 1. The difference is that this embodiment adopts a connection structure of a bolt and single nut, and the bolt body has a hexagonal head larger than the screw body 31. When the hexagonal head of the bolt is located on the left side, the cylindrical body 2, that is the nut body 21 or the single nut, is located on the right side of the fastened workpiece 130. When the connection structure of a bolt and single nut in this embodiment works, the relationship with the fastened workpiece 130 is also a rigid connection. The rigid connection means that the opposite end surfaces of the end face of the nut body 21 and the end face of the workpiece 130 are mutually supporting surfaces, and the supporting surface is the locking supporting surface 111. The workpiece 130 refers to a connected object including the workpiece 130.

[0073] The tapered thread working supporting surface of this embodiment is the tapered thread support surface 122. In other words, the cylindrical body 2, that is, the nut body 21 or the single nut, is located on the right side of the fastened workpiece 130. When the connection structure of the bolt and single nut works, the right end surface of the workpiece 130 and the left end surface of the nut body 21 are the locking supporting surface 111 of the nut body 21 and the fastened workpiece 130. The right helical conical surface of the bidirectional tapered thread 1 of the nut body 21 and columnar body 3, that is, the bolt body 31 or bolt, is the thread working supporting surface. In other words, the second conical surface of the tapered hole 422 and the first helical conical surface of the truncated cone body 722 are the supporting surface of the tapered thread 122. The second conical surface of the tapered hole 422 and the second helical conical surface of the truncated cone body 722 are mutually the supporting surfaces.

[0074] In this embodiment, when the hexagon head of the bolt is located on the right side, its structure, principle and implementation steps are similar to this embodiment.

Embodiment 3

[0075] As shown in FIG. 5, the structure, principle, and implementation steps of this embodiment are similar to those of Embodiment 1. The difference is the positional relationship between the double nuts and the fastened workpiece 130. The double nuts include the nut body 21 and the nut body 22, and the bolt body has a hexagonal head larger than the screw body 31. When the hexagonal head of the bolt is located on the left side, the nut body 21 and the nut body 22 are located on the right side of the fastened workpiece 130. When the connection structure of a bolt and double nuts in this embodiment works, the relationship between the nut body 21, the nut body 22 and the fastened workpiece 130 is a non-rigid connection. The non-rigid connection means that the opposite end surfaces of the end face of the nut body 21, the nut body 22 are mutually supporting surfaces, and the supporting surfaces are the locking supporting surface 111 and the locking supporting surface 112. The workpiece 130 refers to a connected object including the workpiece 130.

[0076] The working supporting surface of the thread in this embodiment is different, including the tapered thread support surface 121 and the tapered thread supporting surface 122. The cylindrical body 2 includes the left nut body 21 and the right nut body 22. The right end face of the left nut body 21 is the locking supporting surface 111. The left end face of the right nut body 22 is the locking supporting surface 112. The locking supporting surface 111 and the locking supporting surface 112 contact each other oppositely and act as locking bearing surfaces mutually. When the right end face of the left nut body 21 is the locking supporting surface 111, the left helical conical surface of the bidirectional tapered thread 1 of the left nut body 21 and columnar body 3, that is, the bolt body 31 or bolt, is the thread working supporting surface. In other words, the first conical surface of the tapered hole 421 and the first helical conical surface of the truncated cone body 721 are the supporting surface of the tapered thread 122. The first conical surface of the tapered hole 421 and the first helical conical surface of the truncated cone body 721 are mutually the supporting surfaces. When the left end face of the right nut body 22 is the locking supporting surface 112, the right helical conical surface of the bidirectional tapered thread 1 of the right nut body 22 and columnar body 3, that is, the bolt body 31 or bolt, is the thread working supporting surface. In other words, the second conical surface of the tapered hole 422 and the second helical conical surface of the truncated cone body 722 are the supporting surface of the tapered thread 121. The second conical surface of the tapered hole 422 and the second helical conical surface of the truncated cone body 722 are mutually the supporting surfaces.

[0077] In this embodiment, when the inner cylindrical body 2, that is, the nut body 21 adjacent to the fastened workpiece 130, has been effectively combined with the columnar body 3, that is, the bolt body 31 or blot, the screw body, and in other words, when the internal thread 6 and the external thread 9 forming the tapered thread connection pair 10 are effectively entangled together, the outer cylindrical body 2, that is, the nut body 22 which is not adjacent to the fastened workpiece 130, can stay and/or be removed according to the application conditions, leaving only one nut (for example, if there is a requirement for lightweight equipment or no double nuts to ensure the reliability of the connection technology and other application fields). The removed nut body 22 is not used as a connecting nut but only used as an installation process nut. The internal thread of the installation process nut is not only made of bidirectional tapered threads, but also unidirectional tapered threads and other threads which can be screwed with tapered threads 1, including non-tapered threads such as triangular threads, trapezoidal threads, and sawtooth threads. The reliability of the connection technology should be ensured. The conical connection pair 10 is a closed-loop fastening technology system. That is, when the internal thread 6 and the external thread 9 of the tapered thread connection pair 10 are effectively entangled together, the tapered conical connection pair will become an independent technical system without relying on the technical compensation of the third party to ensure the technical effectiveness. That is, even if there is no support from other objects, including the gap between the tapered thread connection pair 10 and the fastened workpiece, it will not affect the effectiveness of the tapered thread connection pair 10. This will help greatly reduce the equipment weight, remove the dead load, and improve the equipment's effective load capacity, braking performance, energy saving and emission reduction, and other technical requirements. This is the unique thread technology advantage of the tapered thread connection pair 10 of the connection structure of bolt and nut with the bidirectional tapered thread, regardless of whether the relationship with the fastened workpiece 10 is non-rigid or rigid connection. And other thread technologies cannot be provided with this advantage.

[0078] In this embodiment, when the hexagon head of the bolt is located on the right side, the nut body 21 and the nut body 22 are both located on the left side of the fastened workpiece 130, and the structure, principle and implementation steps are similar to those of this embodiment.

Embodiment 4

[0079] As shown in FIG. 6, the structure, principle, and implementation steps of this embodiment are similar to those of embodiment 1 and embodiment 3. The difference is that in this embodiment, on the basis of the third embodiment, a spacer such as a washer 132 is added between the nut body 21 and the nut body 22. In other word, the right end surface of the left nut body 21 and the right end surface of the left nut body 22 are in indirect contact with each other through the spacer and indirectly are mutually locking supporting surfaces. The relationship between the right end face of the left nut body 21 and the left end face of the right nut body 22 is changed from the direct mutual locking supporting surfaces to the indirect mutual locking supporting surfaces.

[0080] The specific embodiments described herein are merely examples to illustrate the spirit of the present disclosure. Those skilled in the technical field to which the present disclosure pertains can make various modifications, additions or similar alternatives to the specific embodiments described, but they will not deviate from the spirit of the present disclosure or exceed the definition range of the appended claims.

[0081] Although the terms are used in this article, such as tapered thread 1, cylindrical body 2, nut body 21, nut body 22, columnar body 3, screw body 31, tapered hole 4, bidirectional tapered hole 41, bidirectional conical surface 42 of the tapered hole, first helical conical surface 421 of the tapered hole, first taper angle 1, second helical cone surface of the tapered hole 422, second taper angle 2, internal helical line 5, internal thread 6, truncated cone body 7, bidirectional truncated cone body 71, bidirectional truncated cone body cone surface 72, first helical cone surface of the truncated cone body 721, first taper angle 1, second helical cone surface of the truncated cone body 722, 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, mirrored, axis sleeve, axis, single cone body, double cones body, cone, internal cone, tapered hole, external cone, cone pair, helical structure, helical motion, threaded body, complete unit body thread, axial force, axial force angle, anti-axial force, anti-axial force angle, centripetal force, reverse central force, reverse collinearity, internal stress, bidirectional force, unidirectional force, sliding bearing, sliding bearing pair, locking supporting surface 111, locking supporting surface 112, tapered thread supporting surface 122, tapered thread supporting surface 121, non-solid space, material entity, workpiece 130, nut body locking direction 131, non-rigid connection, non-rigid material, transmission part and washer 132, they do not exclude the possibility of using other terms. These terms are used only to describe and explain the essence of the present disclosure more conveniently. To interpret them as any additional limitation is against the spirit of the present disclosure.