OLIVE-SHAPED BIDIRECTIONAL TAPERED THREAD BOLT AND NUT CONNECTION STRUCTURE HAVING LARGE LEFT TAPER AND SMALL RIGHT TAPER

Abstract

The disclosure belongs to the technical field of general technology of devices, and relates to an olive-shaped bidirectional tapered thread bolt and nut connection structure having a large left taper and a small right taper, solving the problems of poor self-positioning and self-locking performances of the existing threads. An inner thread (6) is a bidirectional tapered hole (41) on the inner surface of the cylindrical body (2), an external thread (9) is a bidirectional truncated cone body (71) on the outer surface of a columnar body (3), the complete unit threads are both helical olive-like (93) shaped bidirectional tapered bodies which have larger left taper (95) being than right taper (96), and are large in the middle and small in two ends. The performance mainly depends on conical surfaces and tapers of mutually fit thread bodies.

Claims

1. An olive-shaped bidirectional tapered thread bolt and nut connection structure having a large left taper and a small right taper, namely, a bolt and nut connection structure of an olive-like (left taper is larger than right taper) shaped asymmetrical bidirectional tapered thread, comprising: an external thread (9) and an internal thread (6) which are in mutual thread fit, wherein the complete unit thread of the olive-like (left taper is larger than right taper) shaped asymmetric bidirectional tapered thread (1) is a helical olive-like (93) shaped asymmetric bidirectional tapered body which is large in the middle and small in two ends, has a left taper (95) being larger than a right taper (96) and comprises a bidirectional tapered hole (41) and/or bidirectional truncated cone body (71); the thread body of the internal thread (6) is presented by the helical bidirectional tapered hole (41) on the inner surface of the cylindrical body (2) and exists in a form of non-entity space, and the thread body of the external thread (9) is presented by the helical bidirectional truncated cone body (71) on the outer surface of the columnar body (3) and exists in a form of material entity; the left conical surface of the asymmetric bidirectional tapered body forms the left taper (95) corresponding to a first taper angle (1), the right conical surface forms the right taper (96) corresponding to a second taper angle (2), and the left taper (95) and the right taper (96) are opposite in direction and different in taper; the internal thread (6) and the external thread (9) contain cones in the tapered holes till inner and outer conical surfaces bear each other; the technical performance mainly depends on the conical surfaces and tapers of the mutually fit threaded bodies, preferably, 0<first taper angle (1)<53, 0<second taper angle (2)<53; for individual special fields, preferably, 53 first taper angle (1)<180.

2. The connection structure according to claim 1, wherein the olive-like (93) shaped bidirectional tapered internal thread (6) comprises the left conical surface namely a tapered hole first helical conical surface (421) of the bidirectional tapered hole conical surface (42), a right conical surface namely a tapered hole second helical conical surface (422) of the bidirectional tapered hole conical surface (42), and an inner helical line (5); a shape formed by the tapered hole first helical conical surface (421) and the tapered hole second helical conical surface (422) namely a bidirectional helical conical surface is the same as a shape of a helical outer flank of a rotating body, wherein the rotating body is formed by two bevels 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 symmetrical lower bottom sides of two right-angled trapezoids; wherein the two right-trapezoids have identical lower bottom sides and upper bottom sides, and different right-angled sides; wherein the two right-trapezoids are coincident with the central axis of the cylindrical body (2); the olive-like (93) shaped bidirectional tapered external thread (9) comprises a left conical surface namely a truncated cone body first helical conical surface (721) of the bidirectional truncated cone body conical surface (72), a right conical surface namely a truncated cone body second helical conical surface (722) of the bidirectional truncated cone body conical surface (72), and an outer helical line (8); a shape formed by the truncated cone body first helical conical surface (721) and the truncated cone body second helical conical surface (722) namely a bidirectional helical conical surface is the same as a shape of a helical outer flank of the rotating body, wherein the rotating body is formed by the right-angled trapezoid union being rotated around the 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 the central axis of the columnar body (3); wherein the right-angled trapezoid union is formed by oppositely jointing two symmetrical lower bottom sides of two right-angled trapezoids; wherein the two right-trapezoids have identical lower bottom sides and upper bottom sides, and 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 the constant speed, the 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 left conical surface and the right conical surface of the bidirectional tapered body, namely the tapered hole first helical conical surface (421), the tapered hole second helical conical surface (422) and the inner helical line (5) are all continuous helical surfaces or discontinuous helical surfaces and/or the truncated cone body first helical conical surface (721), the truncated cone body second helical conical surface (722) and the outer helical line (8) are all continuous helical surfaces or discontinuous helical surfaces.

6. The connection structure according to claim 1, wherein the helical olive-like (93) shaped asymmetrical bidirectional tapered internal thread (6) is formed by oppositely jointing two symmetrical lower bottom surfaces of two tapered holes (4), wherein the two tapered holes have identical lower bottom surfaces and upper top surfaces, but different taper heights; wherein the upper top surfaces of the two tapered holes are located at two ends of the bidirectional tapered holes (41), and are respectively jointed with the upper top surface of the adjacent bidirectional tapered holes; the helical olive-like (93) shaped asymmetrical bidirectional tapered external thread (9) is formed by oppositely jointing two symmetrical lower bottom surfaces of two truncated cone bodies (7), wherein the two truncated cone bodies have identical lower bottom surfaces and upper top surfaces, but different taper heights; wherein the upper top surfaces of the two truncated cone bodies are located at two ends of the bidirectional truncated cone body (71), and are respectively jointed with the upper top surfaces of the adjacent bidirectional truncated cone bodies (71).

7. The connection structure according to claim 1, wherein when the internal thread (6) and the external thread (9) constitute a thread pair (10), the tapered hole first helical conical surface (421) and the tapered hole second helical conical surface (422) as well as the truncated cone body first helical conical surface (721) and the truncated cone body helical conical surface (722) which are in mutual fit use contact surfaces as bearing surfaces, and the internal and external diameters of the inner cone and the outer cone are centered under the guidance of the helical line till the bidirectional tapered hole conical surface (42) and the bidirectional truncated cone body conical surface (72) are cohered to reach bearing on the helical conical surface in one direction and/or simultaneous bearing on the helical conical surface in two directions and/or till a self locking is generated by fixed-diameter self-positioning contact and/or till fixed-diameter interference contact.

8. The connection structure according to claim 1, wherein the bolt and double nut connection structure is adopted, the double nuts are respectively located at left and right sides of the fastened workpiece and/or the bolt and single nut connection structure is adopted and comprises a single nut (21) being located at the right side or left side of the fastened workpiece and/or the bolt and double nut connection structure is adopted, and the double nuts are both located at the single side of the fastened workpiece; furthermore, when one nut has been effectively combined with the bolt, namely, the internal thread (6) and the external thread (9) constituting the thread connection pair (10) are effectively cohered, the other nut can be disassembled and/or remained, and the disassembled nut is used as an installation process nut whose internal thread comprises a bidirectional tapered thread (1), an unidirectional tapered thread and traditional threads which meet the technical spirit of the disclosure due to mutual thread fit to the bidirectional tapered external thread (9), such as a triangular thread, a trapezoidal thread, a sawtooth thread, a rectangular thread and an arc thread.

9. The connection structure according to claim 1, wherein when the connection hole of the cylindrical body (2) is screwed into the screw-in end of the columnar body (3), the screw-in direction is required, namely, the connection hole of the cylindrical body (2) cannot be screwed in an opposite direction, the connection holes are thread holes formed on the nut (21) and the nut (22), the connection holes are formed in the nut (21) and the nut (22), and the nut refers to an object comprising the nut and having a thread structure on the inner surface of the cylindrical body (2).

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

Description

DESCRIPTION OF THE DRAWINGS

[0043] FIG. 1 is a diagram of a bolt and nut connection structure of an olive-like (left taper is greater than right taper) shaped asymmetric bidirectional tapered thread in embodiment 1 provided by the disclosure.

[0044] FIG. 2 is a structural diagram of a bolt of an olive-like shaped asymmetric bidirectional tapered thread internal thread and a complete unit thread of an external thread in embodiment 1 provided by the disclosure.

[0045] FIG. 3 is a structure diagram of a nut body of an olive-like shaped asymmetric bidirectional tapered thread internal thread and a complete unit thread of an internal thread in embodiment 1 provided by the disclosure.

[0046] FIG. 4 is a diagram of a bolt and single nut connection structure of an olive-like (left taper is greater than right taper) shaped asymmetric bidirectional tapered thread in embodiment 2 provided by the disclosure.

[0047] FIG. 5 is a diagram of a bolt and double nut connection structure of an olive-like (left taper is greater than right taper) shaped asymmetric bidirectional tapered thread in embodiment 3 provided by the disclosure.

[0048] FIG. 6 is a diagram of a bolt and double nut (with a gasket in the middle) connection structure of an olive-like (left taper is greater than right taper) shaped asymmetric bidirectional tapered thread in embodiment 4 provided by the disclosure.

[0049] FIG. 7 is a diagram of the thread in the existing thread technology is a bevel on a cylindrical or conical surface in the background technology of the disclosure.

[0050] FIG. 8 is a diagram of bevel slider model based on the existing thread technology principle-bevel principle in the background technology of the disclosure.

[0051] FIG. 9 is a diagram of lead angle in the existing thread technology in the background technology of the disclosure.

[0052] In the figures, 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 tapered hole conical surface 42, tapered hole first helical conical surface 421, first taper angle 1, tapered hole second helical conical surface 422, second taper angle 2, inner helical line 5, internal thread 6, truncated cone body 7, bidirectional truncated cone body 71, bidirectional truncated cone body conical surface 72, truncated cone body helical conical surface 721, first taper angle 1, truncated cone body second helical conical surface 722, second taper angle 2, outer helical line 8, external thread 9, olive-like 93, 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, nut body locking direction 131, gasket 132, cone axis 01, thread axis 02, slider A on a bevel body, bevel B, gravity G, component G1 of gravity along the bevel, friction force F, lead angle , equivalent friction angle P, large traditional external thread diameter d, small traditional external thread diameter d1, and middle traditional external thread diameter d2.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

[0053] Next, the disclosure will be further described in detail in combination with drawings and embodiments.

Embodiment 1

[0054] As shown in FIG. 1, FIG. 2 and FIG. 3, this embodiment adopts a bolt and double nut connection structure, including a bidirectional truncated cone body 71 helically distributed on the outer surface of the columnar body 3 and a bidirectional tapered hole helically distributed on the inner surface of the cylindrical body 2, that is, including an external thread 9 and an internal thread 6 which are in mutual thread fit, the internal thread 6 is presented by the helical bidirectional tapered hole 41 and exists in a form of non-entity space, and the external thread 9 is presented by the helical bidirectional truncated cone body 71 and exists in a form of material entity. The relationship between the internal thread 6 and the external thread 9 is a containing-contained relationship: the internal thread 6 and the external thread 9 are formed by screwing and sleeving bidirectional tapered geometries one by one to be cohered till interference fit, that is, the bidirectional tapered hole 41 contains the bidirectional truncated cone body 71 pitch by pitch, the disorder freedom degree between the tapered hole 4 and the truncated cone body 7 is bi-directionally contained and limited, helical movement also allows the tapered thread connection pair 10 of the bolt and the nut of the bidirectional tapered thread to acquire necessary order freedom degree, so as to effectively synthesize the technical features of the cone pair and the thread pair.

[0055] In the bolt and nut of the bidirectional tapered thread in this embodiment, when the truncated cone body 7 and/or tapered hole 4 of the tapered thread connection pair 10 reaches a certain taper, that is, the cone constituting the cone pair reaches a certain taper angle, the tapered thread connection pair 10 has self-locking property and self-positioning property. The taper includes left taper 95 and right taper 96, the taper angle includes a left taper angle and a right taper angle. In this embodiment, the asymmetric bidirectional tapered thread 1 has the left taper 95 being larger than the right taper 96. The left taper 95 corresponds to the left taper angle namely first taper angle 1, preferably, 0<first taper angle 1<53, preferably, the first taper angle 1 is 240; for individual special fields, namely connection application fields that do not need self-locking property and/or weak self-locking property and/or high axial bearing capability requirement, preferably, 53first taper angle 1<180, preferably, the first taper angle 1 is 5390; the right taper 96 corresponds to the right taper angle namely second taper angle 2, preferably, 0<second taper angle 2<53, preferably, the second taper angle 2 is 240.

[0056] 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 outer surface of the screw body 31 is provided with the helically distributed truncated cone body 7, the truncated cone body 7 includes the asymmetric bidirectional truncated cone body 71, the asymmetric bidirectional truncated cone body 71 is an olive-like 93 shaped special bidirectional tapered geometry. The columnar body 3 can be solid or hollow, including a cylinder, a cone, a tube and other workpieces and objects that need to be machined with external threads on their outer surfaces.

[0057] The olive-like 93 shaped asymmetric bidirectional truncated cone body 71 is characterized by being formed by oppositely jointing two symmetrical lower bottom surfaces of two truncated cone bodies, wherein the two truncated cone bodies have identical lower bottom surfaces and upper top surfaces, but different taper heights; wherein the upper top surfaces of the two truncated cone bodies are located at two ends of the bidirectional truncated cone body 71, and are respectively jointed with the upper top surfaces of the adjacent bidirectional truncated cone bodies 71, and the outer surface of the truncated cone body 7 is provided with the asymmetric bidirectional truncated cone body conical surface 72. The external thread 9 includes the truncated cone body first helical conical surface 721 and the truncated cone body second helical conical surface 722 as well as an outer helical line 8. In the cross section through which the thread axis 02 passes, the complete single-pitch asymmetric bidirectional tapered external thread 9 is an olive-like 93 shaped special bidirectional conical geometry which is large in the middle and small in two ends. The asymmetric bidirectional truncated cone body 71 includes a bidirectional truncated cone body conical surface 72. The included angle formed by two tessellation limes of the left conical surface namely truncated cone body first helical conical surface 721 is the first taper angle 1. The truncated cone body first helical conical surface 721 forms the left taper 95 and is in left-direction distribution 97, and the included angle between the two tessellation lines of the right conical surface namely truncated cone body second helical conical surface 722 is the second taper angle 2. The truncated cone body second helical conical surface 722 forms the right taper 96 and is in right-direction distribution 98. The tapers corresponding to the first taper angle 1 and the second taper angle 2 are opposite in direction. The tessellation line refers to an intersecting line of the conical surface and the plane through which the cone axis 01 passes. A shape formed by the truncated cone body first helical conical surface 721 and the truncated cone body second helical conical surface 722 of the bidirectional truncated cone body 71 is the same as a shape of a helical outer flank of the rotating body, wherein the rotating body is formed by the right-angled trapezoid union being rotated around the 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 the central axis of the columnar body 3; wherein the right-angled trapezoid union is formed by oppositely jointing two symmetrical lower bottom sides of two right-angled trapezoids; wherein the two right-trapezoids have identical lower bottom sides and upper bottom sides, and different right-angled sides; wherein the two right-trapezoids are coincident with the central axis of the columnar body 3. The right-angled trapezoid union refers to a special geometry in which the lower bottom sides are the same and upper bottom sides are the same but right-angled sides are different, and the lower bottom sides of two right-angled trapezoids are symmetric and oppositely jointed, and the upper bottom sides are respectively at the two ends of the right-angled trapezoid union.

[0058] The internal thread 6 is arranged on the inner surface of the cylindrical body 2, wherein the cylindrical body 2 includes a nut body 21 and a nut body 22, the inner surfaces of the nut body 21 and the nut body 22 are provided with helically distributed tapered holes 4, the tapered hole 4 includes the asymmetric bidirectional tapered hole 41, the asymmetric bidirectional tapered hole 41 is an olive-like 93 shaped special bidirectional tapered geometry, and the cylindrical body 2 includes cylindrical and/or non-cylindrical workpieces and objects that need to be machined with internal threads on their inner surfaces.

[0059] The olive-like 93 shaped asymmetric bidirectional tapered hole 41 is characterized by being formed by oppositely jointing two symmetrical lower bottom surfaces of two tapered holes, wherein the two tapered holes have identical lower bottom surfaces and upper top surfaces, but different taper heights; wherein the upper top surfaces of the two tapered holes are located at two ends of the bidirectional tapered holes 41, and are respectively jointed with the upper top surface of the adjacent bidirectional tapered holes 41. The tapered hole 4 includes an asymmetric bidirectional tapered conical surface 42. The internal thread 6 includes the tapered hole first helical conical surface 421 and the tapered hole second helical conical surface 422 as well as an inner helical line 5. In the cross section through which the thread axis 02 passes, the complete single-pitch asymmetric bidirectional tapered internal thread 6 is an olive-like 93 shaped special bi-directional conical geometry which is large in the middle and small in two ends. The bidirectional tapered hole 41 includes a bidirectional tapered hole conical surface 42. The included angle formed by two tessellation limes of the left conical surface namely tapered hole first helical conical surface 421 is the first taper angle 1. The tapered hole first helical conical surface 421 forms the left taper 95 and is in left-direction distribution 97, and the included angle between the two tessellation lines of the right conical surface namely tapered hole second helical conical surface 422 is the second taper angle 2. The tapered hole second helical conical surface 422 forms the right taper 96 and is in right-direction distribution 98. The tapers corresponding to the first taper angle 1 and the second taper angle 2 are opposite in direction. The tessellation line refers to an intersecting line of the conical surface and the plane which through the cone axis 01 passes. A shape formed by the tapered hole first helical conical surface 421 and the tapered hole second helical conical surface 422 is the same as a shape of a helical outer flank of a rotating body, wherein the rotating body is formed by two bevels 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 symmetrical lower bottom sides of two right-angled trapezoids; wherein the two right-trapezoids have identical lower bottom sides and upper bottom sides, and different right-angled sides; wherein the two right-trapezoids are coincident with the central axis of the cylindrical body 2. The right-angled trapezoid union refers to a special geometry in which the bottom sides are the same and upper bottom sides are the same but right-angled sides are different, and the lower bottom sides of two right-angled trapezoids are symmetric and oppositely jointed, and the upper bottom sides are respectively at the two ends of the right-angled trapezoid union.

[0060] In this embodiment, the bolt and nut connection structure is adopted, the double nuts include the nut body 21 located at the left side of the fastened workpiece 130 and the nut body 22 located at the right side of the fastened workpiece 130. When the bolt and the double nuts work, a relationship between the double nuts and the fastened workpiece 130 is a rigid connection. The rigid connection refers to a fact that the bearing surface of the nut end surface and the bearing surface of the workpiece are each other's bearing surfaces, including a locking bearing surface 111 and a locking bearing surface 112. The workpiece 130 refers to a connected object including the workpiece 130.

[0061] The thread work bearing surface in this embodiment is different, including a tapered thread bearing surface 121 and a tapered thread bearing surface 122. When the cylindrical body 2 is located at the left side of the fastened workpiece 130, that is, the left end surface of the fastened workpiece 130 and the right end surface of the cylindrical body 2 namely left nut body 21 are locking bearing surfaces 111 of the left nut body 21 and the fastened workpiece 130, the right helical conical surface of the bidirectional tapered thread 1 of the left nut body 21 and the columnar body 3 namely screw body 31 namely bolt is the thread work bearing surface, that is, the tapered hole second helical conical surface 422 and the truncated cone body second helical conical surface 722 are tapered hole thread bearing surfaces 122, and the tapered hole second helical conical surface 422 and the truncated cone body second helical conical surface 722 are each other's bearing surfaces. When the cylindrical body 2 is located at the right side of the fastened workpiece 130, that is, the right end surface of the fastened workpiece 130 and the left end surface of the cylindrical body 2 namely right nut body 22 are locking bearing surfaces 112 of the right nut body 22 and the fastened workpiece 130, the left helical conical surface of the bidirectional tapered thread 1 of the right nut body 22 and the columnar body 3 namely screw body 31 namely bolt is the thread work bearing surface, that is, the tapered hole first helical conical surface 421 and the truncated cone body first helical conical surface 721 are tapered thread bearing surfaces 121, and the tapered hole first helical conical surface 421 and the truncated cone body first helical conical surface 721 are each other's bearing surfaces.

[0062] When being in transmission connection, the bidirectional tapered internal thread and the traditional thread are in bidirectional bearing through screw connection of the bidirectional tapered hole 41 and the special tapered body 7 of the traditional external thread 9. When the external thread Sand the internal thread 6 constitute the thread pair 10, there must be a clearance 101 between the bidirectional tapered hole 41 and the special tapered body 7 of the traditional external thread 9. If there is an oily medium between the internal thread 6 and the external thread 9 for lubrication, a bearing oily film will be easily formed, the clearance 101 is beneficial to formation of the bearing oily film. The thread connection pair 10 is equivalent to a group of sliding bearing pairs composed of one pair and/or several pairs of sliding bearings, that is, each bidirectional tapered internal thread 6 bi-directionally receives a corresponding bidirectional external thread 9 so as to form a pair of sliding bearings. The number of the formed sliding bearings is adjusted according to application working conditions, that is, the bidirectional tapered internal thread 6 and the bidirectional external thread 9 are effectively and directionally jointed, that is, the number of containing-contained threads that are effectively and directionally in contact cohesion is designed according to application working conditions, and the truncated cone body 7 is bi-directionally received through the tapered hole 4 and is positioned in multiple directions such as radial, axial, angular and circumferential directions, so as to form a special cone pair and thread pair synthesis technology to ensure the tapered thread technology, especially the accuracy, efficiency and reliability of the transmission connection of the bolt and nut connection structure of the bidirectional tapered thread.

[0063] When the bolt and nut of the bidirectional tapered thread is in fastening connection and in sealing connection, its technical performance is realized by screw connection of the bidirectional tapered hole 41 and the bidirectional truncated cone body 71, that is, realized by fixed-diameter interference between the truncated cone body first helical conical surface 721 and the tapered hole first helical conical surface 421 and/or fixed-diameter interference between the truncated cone body second helical conical surface 722 and the tapered hole second helical conical surface 422. According to application working conditions, bearing in one direction and/or simultaneous and respective bearing in two directions are achieved, that is, the bidirectional truncated cone body 71 and the bidirectional tapered hole 41 are subjected to centring of the inner and outer diameters of the inner cone and the outer cone under the guidance of the helical line till the tapered hole first helical conical surface 421 and the truncated cone body first helical conical surface 721 are cohered till interference contact and/or the tapered hole second helical conical surface 422 and the truncated cone body second helical conical surface 722 are cohered till interference contact, thereby realizing technical performances of mechanical mechanisms, such as connection, locking, loosening prevention, bearing, fatigue and sealing.

[0064] Therefore, transmission accuracy, transmission effectiveness, bearing capability, self-locking force, loose prevention capability, sealing property and other technical properties of the bolt and nut of the bidirectional tapered thread in this embodiment are related to the truncated cone body first helical conical surface 721 and its formed left taper 95 namely first taper angle 1 and the truncated cone body second helical conical surface 722 and its formed right taper 96 namely second taper angle 2 as well as the tapered hole first helical conical surface 421 and its left taper 95 namely first taper angle 1 and the tapered hole second helical conical surface 422 and its right taper 96 namely second taper angle 2. The material friction coefficients, machining qualities and application workings condition of the columnar body 3 and the cylindrical body 2 can also affect cone fit to a certain extent.

[0065] In the bolt and nut of the above 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 a length of the sum of the right-angled sides of two right-angled trapezoids with the same lower bottom sides and the same upper bottom sides but different right-angled sides. This structure ensures that the truncated cone body first helical conical surface 721 and the truncated cone body second helical conical surface 722 as well as the tapered hole first helical conical surface 421 and the tapered hole second helical conical surface 422 have enough lengths, thus ensuring that the bidirectional truncated cone body conical surface 72 and the bidirectional tapered hole conical surface 42 have sufficiently effective contact areas and strengths and efficiency required by helical movement when being fit.

[0066] In the bolt and nut of the above 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 a length of the sum of the right-angled sides of the two right-angled trapezoids with the same lower bottom sides and the same upper bottom sides but different right-angled sides. This structure ensures that the truncated cone body first helical conical surface 721 and the truncated cone body second helical conical surface 722 as well as the tapered hole first helical conical surface 421 and the tapered hole second helical conical surface 422 have enough lengths, thus ensuring that the bidirectional truncated cone body conical surface 72 and the bidirectional tapered hole conical surface 42 have sufficiently effective contact areas and strengths and efficiency required by helical movement when being fit.

[0067] In the bolt and nut of the above bidirectional tapered thread, both of the truncated cone body first helical conical surface 721 and the truncated cone body second helical conical surface 722 are continuous helical surfaces or discontinuous helical surfaces; both of the tapered hole first helical conical surface 421 and the tapered hole second helical conical surface 422 are continuous helical surfaces or discontinuous helical surfaces.

[0068] In the bolt and nut of the above directional tapered thread, the connection hole of the cylindrical body 2 is screwed into the screw-in end of the columnar body 3, the screw-in direction is required, that is, the connection hole of the cylindrical body 2 cannot be screwed along the opposition direction.

[0069] In the bolt and nut of the above 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 the one end or two ends of the columnar body 3 are provided with a head having a size smaller than the small diameter of the tapered thread external thread 9 of the screw body 31 of the columnar body 3, the connection hole is the thread hole formed on the nut body 21. That is, the columnar body 3 herein and the head are connected to form the bolt, and the bolt which has no head and/or heads at the two ends being smaller than the small diameter of the bidirectional tapered external thread 9 and/or has no thread in the middle and bidirectional tapered external threads 9 respectively at two ends is a double-screw bolt, and the connection hole is formed in the nut body 21.

[0070] Compared with the prior art, the tapered thread connection pair 10 of the bolt and nut connection structure of the bidirectional tapered thread has the advantages of reasonable design, simple structure, convenient operation, large locking force, large bearing force, good anti-loosing property, high transmission efficiency and accuracy, good mechanical seal effect and good stability, is capable of preventing release when connection and has self-locking and self-positioning functions, and fastening and connection functions are achieved through sizing of the cone pair formed by inner and outer cones till interference fit.

Embodiment 2

[0071] As shown in FIG. 4, the structure, principle and implementation steps of this embodiment are the same as those in embodiment 1. The difference is that this embodiment adopts the bolt and single nut connection structure, and the bolt body has a hexagonal head larger than the screw body 31. When the hexagonal head is located at the left side, the cylindrical body 2 namely nut body 21 namely single nut is located at the right side of the fastened workpiece 130. When the bolt and single nut connection structure in this embodiment works, a relationship between the connection structure and the fastened workpiece 130 is similarly rigid connection. The rigid connection refers to a fact that the end surface of the nut body 21 and the opposite end surface of the end surface of the workpiece 130 are each other's bearing surfaces. The bearing surface is a locking bearing surface 111. The workpiece 130 refers to a connected object including the workpiece 130.

[0072] The thread work bearing surface in this embodiment is the tapered thread bearing surface 122, that is, the cylindrical body 2 namely nut body 21 namely single nut is located at the right side of the fastened workpiece 130. When the bolt and single nut connection structure works, the right end surface of the workpiece 130 and the left end surface of the nut body 21 are locking bearing surfaces 111 of the nut body 21 and the fastened workpiece 130. The left helical conical surfaces of the bidirectional tapered threads 1 of the nut body 21 and the columnar body 3 namely screw body 31 namely bolt are the thread work bearing surfaces, that is, the tapered hole first helical conical surface 421 and the truncated cone body first helical conical surface 721 are the tapered thread bearing surfaces 122 and the tapered hole first helical conical surface 421 and the truncated cone body first helical conical surface 721 are each other's bearing surfaces.

[0073] In this embodiment, when the hexagonal head is located at the right side, the structure, principle and implementation steps are the same as those in this embodiment.

Embodiment 3

[0074] As shown in FIG. 5, the structure, principle and implementation steps of this embodiment are the same as those in embodiment 1. The difference is that the position relationship of the double nuts and the fastened workpiece 130 is different. The double nuts include a nut body 21 and a nut body 22 and the bolt body has a hexagonal head larger than the screw body 31. When the hexagonal head is located at the left side, both of the nut body 21 and the nut body 22 are located at the right side of the fastened workpiece 130. When the bolt and double nut connection structure works, a relationship among the nut body 21, the nut body 22 and the fastened workpiece 130 is a non-rigid connection. The non-rigid connection refers to a fact that the opposite end surfaces of two nut bodies namely the nut body 21 and the nut body 22 are each other's bearing surfaces. The bearing surfaces include a locking bearing surface 111 and a locking bearing surface 112, and mainly applied to non-rigid materials or other non-rigid connection workpieces 130 such transmission members or application fields meeting requirements through installation of double nuts. The workpiece 130 refers to a connected object including the workpiece 130.

[0075] The thread work bearing surface in this embodiment is different, including a tapered thread bearing surface 121 and a tapered thread bearing surface 122. When the cylindrical body 2 includes the left nut body 21 and the right nu body 22, the right end surface namely locking bearing surface 111 of the left nut body 21 and the left end surface namely locking bearing surface 112 of the right nut body 22 are in opposite and direct contact and each other's locking bearing surfaces. When the right end surface of the left nut body 21 is the locking bearing surface 111, the right helical conical surfaces of the bidirectional tapered threads 1 of the left nut body 21 and the columnar body 3 namely screw body 31 namely bolt are the thread work bearing surfaces, that is, the tapered hole second helical conical surface 422 and the truncated cone body second helical conical surface 722 are the tapered thread bearing surfaces 122 and the tapered hole second helical conical surface 422 and the truncated cone body second helical conical surface 722 are each other's bearing surfaces. When the left end surface of the right nut body 22 is the locking bearing surface 112, the left helical conical surfaces of the bidirectional tapered threads 1 of the right nut body 22 and the columnar body 3 namely screw body 31 namely bolt are the thread work bearing surfaces, that is, the tapered hole second helical conical surface 422 and the truncated cone body second helical conical surface 722 are the tapered thread bearing surfaces 122 and the tapered hole first helical conical surface 421 and the truncated cone body first helical conical surface 721 are each other's bearing surfaces.

[0076] In this embodiment, when the cylindrical body 2 located inside namely the nut body 21 adjacent to the fastened workpiece 130 has been effectively combined with the columnar body 3 namely screw body 31 namely bolt, that is, the internal thread 6 and the external thread 9 constituting the thread connection pair 10 are effectively cohered, the cylindrical body 2 located outside namely the nut body 22 which is not adjacent to the fastened workpiece 130 can kept unchanged and/or disassembled with one nut left (for example, application fields which have requirements on light weigh of equipment or double buts are not needed to ensure the reliability of the connection technology), the disassembled nut body 22 is used as an installation process nut rather than connection nut. Besides being manufactured using the bidirectional tapered thread, the internal thread of the installation process nut is the nut body 22 manufactured using an unidirectional tapered thread and other threads formed by screwing with the tapered thread 1, including a triangular thread, a trapezoidal thread, a sawtooth thread and other non-tapered threads. On the premise of ensuring the reliability of the connection technology, the tapered thread connection pair 10 is a closed-loop fastening technology system, that is, after the internal thread 6 and the external thread 9 of the tapered thread connection pair 10 can be effectively cohered, the tapered thread connection pair 10 will automatically become an independent technical system without relying on the technical compensation of the third party to ensure the technical effectiveness of the connection technology system, that is, even if there are no supports of other objects, including a gap exists between the tapered thread connection pair 10 and the fastened workpiece 130, the effectiveness of the tapered thread connection pair 10 is not affected, which will facilitates significant reduction of the weight of the equipment, removal of the invalid load and promotion of the effective load capability of the equipment, braking performance, energy conservation and emission reduction and other technical requirements, and is a thread technology advantage that is unique when the relationship between the bolt and nut connection structure of the bidirectional tapered thread and the fastened workpiece 130 is non-rigid connection or rigid connection, exclusive of other thread technologies.

[0077] In this embodiment, when the hexagonal head of the bolt is located at the right side, both of the nut body 21 and the nut body 22 are located at the left side of the fastened workpiece 130, the structure, principle and implementation steps are similar to those of this embodiment.

Embodiment 4

[0078] As shown in FIG. 6, the structure, principle and implementation steps of this example are similar to those in embodiment 1 and embodiment 3. The difference is that in this embodiment, a spacer such as gasket 132 is added between the nut body 21 and the nut body 22 on the basis of embodiment 3, that is, the right end surface of the left nut body 21 is in opposite and indirect contact with the left end surface of the right nut body 22 via the gasket 132, so as to lock the bearing surfaces with each other, namely, a mutual relationship between the right end surface of the let nut body 21 and the left end surface of the right nut body 22 becomes indirect mutual locking of the support face from direct mutual locking of the support face.

[0079] Embodiments of the disclosure are only exemplified for the spirit of the disclosure. Those skilled in the art can make various modifications or supplementations to the described embodiments or use similar manners for replacement, which are not depart from the spirit of the disclosure or go beyond scope defined by the claims.

[0080] Although the present application uses terms such as tapered thread 1, cylindrical patent body 2, nut body 21, nut body 22, columnar patent body 3, screw body 31, tapered hole 4, bidirectional tapered hole 41, bidirectional tapered hole conical surface 42, tapered hole first helical conical surface 421, first taper angle 1, tapered hole second helical conical surface 422, second taper angle 2, inner helical line 5, internal thread 6, truncated cone body 7, bidirectional truncated cone body 71, bidirectional truncated cone body conical surface 72, truncated cone body first helical conical surface 721, first taper angle 1, truncated cone body second helical conical surface 722, first taper angle 2, outer helical line 8, external thread 9, olive-like 93, left taper 95, right taper 96, left distribution 97, right 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, single tapered body, dual tapered body, cone, inner cone, tapered hole, outer cone, tapered body, cone pair, helical structure, helical motion, thread body, complete unit thread, axial force, axial force angle, counter-axial force, counter-axial force angle, centripetal force, counter centripetal force, counter collineation, internal stress, bidirectional force, unidirectional force, sliding bearing, sliding bearing pair, locking bearing surface 111, locking bearing surface 112, tapered thread bearing surface 122, tapered thread bearing surface 121, non-entity space, material entity, workpiece 130, nut body locking direction 131, non-rigid connection, non-rigid material, transmission member and gasket 132, but are not exclusive of other terms, use of these terms are only for more conveniently describing and explaining the essence of the disclosure, and explaining them into any additional limitation is contrary to the spirit of the disclosure.