CONNECTION PAIR OF THREADS OUTLINING ASYMMETRICALLY AND BIDIRECTIONAL TAPERED DUMBBELL-LIKE SHAPE HAVING SMALLER-END CONICAL DEGREE

Abstract

The disclosure relates to the general technology of equipment, and in particular relates to a connection pair of threads outlining asymmetrically and bidirectional tapered dumbbell-like shape having smaller-end conical degree. The disclosure solves the problems of poor self-positioning and poor self-locking of existing threads, etc. The disclosure is characterized that an internal thread (6) on the inner surface of a cylindrical body (2) outlines a bidirectionally tapered hole (41) (non-solid space) and an external thread (9) on the outer surface of a columnar body (3) outlines a bidirectionally truncated cone body (71) (material entity) and each complete thread body unit forms a special bidirectionally tapered body in a helical dumbbell-like shape (94) having a small middle part and two large ends, the left taper being smaller than the right taper (96).

Claims

1. A connection pair of threads outlining asymmetrically and bidirectional tapered dumbbell-like shape having smaller-end conical degree, that is, a connection pair of dumbbell-like shape (a left taper is smaller than a right taper) asymmetric bidirectional tapered threads, 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 (.sup.1)<53, 0<the second taper angle (.sup.2)<530, for individual special fields, preferably, 53the second taper angle (.sup.2)<180.

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

4. The bidirectional tapered thread according to claim 2, wherein when the right-angled trapezoid union rotates a circle at a constant speed, an axial movement distance of the right-angled trapezoid union is 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 pair of threads 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 pair of threads 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 pair of threads according to claim 1, wherein a major diameter of the external thread (9) adopts an external shape corner structure, a small diameter of the external thread (9) adopts an internal shape corner structure, a major diameter of the internal thread (6) adopts an internal shape corner structure, and a small diameter of the internal thread (6) adopts an external sharp corner structure; and/or the small diameter of the external thread (9) adopts the groove (91) structure treatment, the major diameter of the internal thread (6) adopts the groove (61) structure treatment while the major diameter of the external thread (9) and the small diameter of the internal thread (6) stay sharp corner structure; and/or the major diameter of the external thread (9) adopts the flat top or arc (92) structure treatment, the small diameter of the internal thread (6) adopts the flat top or arc (62) structure treatment while the small diameter of the external thread (9) and the major diameter of the internal thread (6) stay sharp corner structure; and/or the small diameter of the external thread (9) adopts the groove (91) structure treatment, the major diameter of the internal thread (6) adopts the groove (61) structure treatment while the major diameter of the external thread (9) adopts the flat top or arc (92) structure treatment, the small diameter of the internal thread (6) adopts the flat top or are (62) structure treatment.

8. The connection pair of threads according to claim 1, wherein the internal thread (6) and the external thread (9) form the thread pair (10); in other words, the helical bidirectional tapered hole (41) and the helical bidirectional truncated cone body (71) under the guidance of the helical line are sizing cooperation to form sections of the cone pairs which form a thread pair (10); there is a clearance (101) between the bidirectional truncated cone body (71) and the bidirectional tapered hole (41); each section of bidirectional conical internal thread (6) contains a corresponding section of bidirectional conical external thread (9) coaxially centering and sizing to form a pair of sliding bearing; the entire threaded connection pair (10) comprises one or several pairs of sliding bearings; the number of containing and contained sections effectively bidirectionally jointed or contacting is designed according to the application conditions; the internal thread (6) tapered hole (4) bidirectionally contain the external thread (9) the truncated cone body (7); it is positioned in multiple directions such as the radial, circumferential, angular and axial directions; each section of internal thread (6) and external thread (9) includes one side bidirectional load bearing and/or two sides of the left and right bidirectional load bearing.

9. The connection pair of threads according to claim 1, wherein the internal thread (6) and the external thread (9) form the thread pair (10); in other words, the first helical cone surface of tapered hole (421), the second helical cone surface of tapered hole (422), the matching first helical cone surface of the truncated cone body (721) and the matching second helical cone surface of the truncated cone body (722) take the contacting 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 are centred until the cone surface of bidirectional tapered hole (42) and the cone surface of bidirectional truncated cone body (72) are entangled so that the helical cone 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 producing self-locking.

10. The connection pair of threads according to claim 1, wherein the columnar body (3) can be solid or hollow, comprising workpieces and objects such as columnar and/or non-columnar bodies that need to be processed with a bidirectional conical external thread (9) on the outer surface; the cylindrical body (2) comprises workpieces and objects such as cylindrical and/or non-cylindrical bodies that need to be processed with a bidirectional conical internal thread (6) on the inner surface; the above-mentioned outer and/or inner surfaces include surface geometry such as cylindrical and/or conical surfaces and other non-cylindrical surfaces.

11. 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

[0041] FIG. 1 is a schematic diagram of a connection pair of dumbbell-like shape (the left taper is smaller than the right taper) asymmetric bidirectional tapered threads according to embodiment 1 of the present disclosure.

[0042] FIG. 2 is a schematic diagram of connection pair of dumbbell-like shape (the left taper is smaller than the right taper) asymmetric bidirectional tapered threads and the complete unit thread of external thread according to the embodiment 1 of the present disclosure.

[0043] FIG. 3 is a schematic diagram of the connection pair of dumbbell-like shape (the left taper is smaller than the right taper) asymmetric bidirectional tapered threads and the complete unit thread of internal thread according to the embodiment 1 of the present disclosure.

[0044] FIG. 4 is a schematic diagram of a connection pair of dumbbell-like shape (the left taper is smaller than the right taper) asymmetric bidirectional tapered threads according to embodiment 2 of the present disclosure.

[0045] FIG. 5 is a schematic diagram of a connection pair of dumbbell-like shape (the left taper is smaller than the right taper) asymmetric bidirectional tapered threads according to embodiment 3 of the present disclosure.

[0046] FIG. 6 is a schematic diagram of a connection pair of dumbbell-like shape (the left taper is smaller than the right taper) asymmetric bidirectional tapered threads according to embodiment 4 of the present disclosure.

[0047] FIG. 7 is a schematic diagram of a connection pair of dumbbell-like shape (the left taper is smaller than the right taper) asymmetric bidirectional tapered threads according to embodiment 5 of the present disclosure.

[0048] FIG. 8 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.

[0049] FIG. 9 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.

[0050] FIG. 10 is an illustration of the a thread rise angle of the existing thread technology involved in the background technology of the present disclosure.

[0051] 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, conical surface 42 of the tapered hole, first helical conical surface 421 of the tapered hole, first taper angle 1, second helical conical surface 422 of the tapered hole, second taper angle 2, internal helical line 5, internal thread 6, truncated cone body 7, bidirectional truncated cone body 71, conical surface 72 of the truncated cone body, first helical conical surface 721 of the truncated cone body, first taper angle 1, second helical conical surface 722 of the truncated cone body, second taper angle 2, external helical line 8, external thread 9, 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 plane, friction force F, thread rise angle , equivalent friction angle P, major diameter d of the traditional external thread, minor diameter d1 of the traditional external thread and pitch diameter d2 of the traditional external thread.

DETAILED DESCRIPTION OF EMBODIMENTS

[0052] The present disclosure will be further described in detail below with reference to the drawings and specific embodiments.

Embodiment 1

[0053] As shown in FIG. 1, FIG. 2, and FIG. 3, the connection pair of dumbbell-like shape asymmetric bidirectional tapered threads, includes a bidirectional truncated cone body 71 spirally distributed on the outer surface of the columnar body 3 and a bidirectional tapered hole 41 spirally distributed on the inner surface the cylindrical body 2, that is, including an external thread 9 and an internal thread 6 that are threaded to each other. The internal thread 6 is distributed in a helical bidirectional tapered hole 41 and exists in the form of a non-solid space. The external thread 9 is distributed in a helical bidirectional truncated cone body 71 and exists in the form of a material entity. The internal thread 6 and the external thread 9 are the relationship between the containing part and the contained part: the internal thread 6 and the external thread 9 are sections of the bidirectional conical geometric body which are screwed together until the interference cooperation. In other words, the bidirectional tapered hole 41 contains the bidirectional truncated cone body 71 section by section. The bidirectional containment limits the disorder degree of freedom between the tapered hole 4 and the truncated cone body 7. The helical movement allows the tapered thread connection pair 10 of the bolt and nut with the bidirectional tapered thread to obtain the necessary orderly degree of freedom. This effectively synthesizes the technical characteristics of the cone pair and the thread pair.

[0054] The connection pair of dumbbell-like shape asymmetric bidirectional tapered threads in this embodiment is used with the conical surface 72 of the truncated cone body and the bidirectional tapered hole cone surface 42 cooperating with each other.

[0055] For the connection pair of dumbbell-like shape asymmetric bidirectional tapered threads in this embodiment, when the conical cone body 7 and/or the tapered hole 4 of the tapered thread connection pair 10 reach a certain taper, that is, the cone that makes up the cone pair reaches a certain taper angle, the tapered thread connection pair 10 is self-locking and self-locating. The taper includes a left taper 95 and a 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 a left taper 95 less than a right taper 96. The left taper 95 corresponds to the left taper angle, that is, the first taper angle 1. Preferably, 0<the first taper angle <153. Preferably, the first taper angle 1 takes a value of 2-40. The right taper 96 corresponds to the right taper angle, that is, the second taper angle 2. Preferably, 0<the second taper angle 2<53. Preferably, the second taper angle 2 takes a value of 2-40. In some special connection application fields where self-locking is not required and/or self-positioning is required weakly and/or axial bearing capacity is required strongly, preferably, 53the second taper angle 2<180, and preferably, the second taper angle 2 takes a value of 53-90.

[0056] The external thread 9 is arranged on the outer surface of the columnar body 3, characterized in that the columnar body body 3 has a screw body 31, and the outer surface of the screw body 31 has a truncated cone body 7 distributed in a helical shape. The truncated cone body 7 includes an asymmetric bidirectional truncated cone body 71. The asymmetric bidirectional truncated cone body 71 is a special dumbbell-like shape 94 bidirectional cone geometry. The columnar body 3 can be solid or hollow, including cylinders, cones, pipes, etc.

[0057] The dumbbell-like shape 94 asymmetric bidirectional truncated cone body 71 is characterized in that is formed by the upper top surfaces of two truncated cone bodies join to each other symmetrically. The two truncated cone bodies have the same lower bottom surface and the same upper top surface but different cone heights. The lower bottom surfaces are at the two ends of the bidirectional truncated cone body 71. When the asymmetric tapered thread 1 is formed, the upper bottom surfaces are joined respectively to the bottom surfaces of the bidirectional truncated cone body 71. The outer surface of the truncated cone body 7 has a conical surface of the asymmetric bidirectional truncated cone body 72. The external thread 9 includes the first helical conical surface of the truncated cone body 721, the second helical conical surface of the truncated cone body 722, and the external helical line 8. In the section passing through the thread axis 02, the complete single-section asymmetric bidirectional conical external thread 9 is a complete single-section asymmetrical bidirectional conical dumbbell-like shape 94 geometry with a smaller middle, larger ends, and the taper of the left truncated cone is smaller than that of the right truncated cone. The asymmetric bidirectional truncated cone body 71 includes the conical surface of the bidirectional truncated cone body 72. The angle between two element lines of the left side of the conical surface, that is, the first helical conical surface of the truncated cone body 721 is the first taper angle 1. The first helical conical surface of the truncated cone body 721 forms a left taper 95 and is in right-direction distribution 98. The angle between two element lines of the right side of the conical surface, that is, the second helical conical surface of the truncated cone body 722 is the second taper angle 2. The second helical conical surface of the truncated cone body 721 forms a right taper 96 and is in left-direction distribution 97. The first taper angle 1 and the second taper angle 2 correspond to the same direction of taper. The element line is the intersection of the surface of the cone and the plane passing through the cone axis 01. The upper bases of two right-angled trapezoids with the same lower base and the same upper base but different right-angle sides, which coincide with the central axis of the columnar body 3, are symmetrical and joined to each other to form a right-angled trapezoidal combination. The center rotates at a uniform speed in the circumferential direction, and the right-angled trapezoidal combined body moves axially along the central axis of the columnar body 3 at a uniform speed at the same time, and the two oblique sides of the right-angled trapezoidal combined body form a gyrating body. The helical outer surface of the gyrating body has the same shape as the first helical conical surface of the truncated cone body 721 and the second helical conical surface of the truncated cone body 722 of the bidirectional truncated cone body 71. The right-angled trapezoidal combination refers to a special geometric body with two right-angled trapezoids with the same lower base and the same upper base but different right-angled sides. The upper bases are symmetrical and joined to each other, and the lower bases are respectively at both ends of the right-angled trapezoidal combination.

[0058] The internal thread 6 is arranged on the inner surface of the cylindrical body 2, which is characterized in that the cylindrical body 2 includes a nut body 21, a nut body 22. The inner surfaces of the nut body 21 and the nut body 22 has spiral-distributed cone holes 4. 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 includes the workpiece and object that needs to be processed on its inner surface, such as a cylindrical body and/or a non-cylindrical body.

[0059] The dumbbell-like shape 94 asymmetric bidirectional tapered hole 41 is characterized in that is formed by the upper top surfaces of two truncated cone bodies join to each other symmetrically. The two tapered holes have the same lower bottom surface and the same upper top surface but different cone heights. The lower bottom surfaces are at the two ends of the bidirectional tapered hole 41. When the asymmetric tapered thread 1 is formed, the upper bottom surfaces are joined respectively to the bottom surfaces of the bidirectional tapered hole 41. The outer surface of the tapered hole 4 has a conical surface of the asymmetric bidirectional tapered hole 42. The internal thread 6 includes the first helical conical surface of the tapered hole 421, the second helical conical surface of the tapered hole 422, and the internal helical line 6. In the section passing through the thread axis 02, the complete single-section asymmetric bidirectional conical internal thread 6 is a complete single-section asymmetrical bidirectional conical dumbbell-like shape 94 geometry with a smaller middle, larger ends, and the taper of the left truncated cone is smaller than that of the right truncated cone. The asymmetric bidirectional tapered hole 41 includes the conical surface of the bidirectional tapered hole 42. The angle between two element lines of the left side of the conical surface, that is, the first helical conical surface of the tapered hole 421 is the first taper angle 1. The first helical conical surface of the tapered hole 421 forms a left taper 95 and is in right-direction distribution 98. The angle between two element lines of the right side of the conical surface, that is, the second helical conical surface of the tapered hole 422 is the second taper angle 2. The second helical conical surface of the tapered hole 421 forms a right taper 96 and is in left-direction distribution 97. The first taper angle 1 and the second taper angle 2 correspond to the same direction of taper. The element line is the intersection of the surface of the cone and the plane passing through the cone axis 01. The upper bases of two right-angled trapezoids with the same lower base and the same upper base but different right-angle sides, which coincide with the central axis of the cylindrical body 2, are symmetrical and joined to each other to form a right-angled trapezoidal combination. The center rotates at a uniform speed in the circumferential direction, and the right-angled trapezoidal combined body moves axially along the central axis of the cylindrical body 2 at a uniform speed at the same time, and the two oblique sides of the right-angled trapezoidal combined body form a gyrating body. The helical outer surface of the gyrating body has the same shape as the first helical conical surface of the tapered hole 421 and the second helical conical surface of the tapered hole 422 of the bidirectional tapered hole 41. The right-angled trapezoidal combination refers to a special geometric body with two right-angled trapezoids with the same lower base and the same upper base but different right-angled sides. The upper bases are symmetrical and joined to each other, and the lower bases are respectively at both ends of the right-angled trapezoidal combination.

[0060] For the connection pair of dumbbell-like shape asymmetric bidirectional tapered threads in this embodiment, the junction of the adjacent helical conical surface of the external thread 9 and the junction of the adjacent helical conical surface of the internal thread 6 are connected by sharp corner. The sharp corner, relative to the non-sharp corner, refers to the structure without special non-sharp corner treatment.

[0061] The dumbbell-like shape (94) bidirectional truncated cone body 71 and bidirectional tapered hole 41 are characterized as follows. For the same helical of the bidirectional truncated conical body 71, the joint between the first helical conical surface of the truncated conical body 721 and the second helical conical surface of the truncated conical body 722, that is, the small diameter of the external thread 9, is connected by an inner sharp corner structure and forms a outer helical line 8 distributed spirally. For the same helical of the bidirectional truncated conical body 71, the joint between the first helical conical surface of the truncated conical body 721 and the neighbouring second helical conical surface of the truncated conical body 722, and/or the joint between the second helical conical surface of the truncated conical body 722 and the neighbouring first helical conical surface of the truncated conical body 721, that is, the major diameter of the external thread 9, is connected by an outer sharp corner structure and forms a outer helical line 8 distributed spirally. For the same helical of the bidirectional tapered hole 41, the joint between the first helical conical surface of the tapered hole 421 and the second helical conical surface of the tapered hole 422, that is, the small diameter of the internal thread 6, is connected by an outer sharp corner structure and forms a inner helical line 5 distributed spirally. For the same helical of the bidirectional tapered hole 41, the joint between the first helical conical surface of the tapered hole 421 and the neighbouring second helical conical surface of the tapered hole 422, and/or the joint between the second helical conical surface of the tapered hole 422 and the neighbouring first helical conical surface of the tapered hole 421, that is, the major diameter of the internal thread 6, is connected by an inner sharp corner structure and forms a inner helical line 5 distributed spirally. The thread structure is more compact, the strength is higher, the bearing value is large. It has good mechanical connection, locking and sealing performance, and the physical space for taper thread processing is more spacious.

[0062] The connection pair of dumbbell-like shape asymmetric bidirectional tapered threads is 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.

[0063] For connection pair of dumbbell-like shape asymmetric bidirectional tapered threads, 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.

[0064] Therefore, for the connection pair of dumbbell-like shape asymmetric bidirectional tapered threads 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.

[0065] For the above-mentioned connection pair of dumbbell-like shape asymmetric bidirectional tapered threads, when the right-angled trapezoidal combined body makes one revolution at a constant speed, the axially moving distance of the right-angled trapezoidal combined body is at least twice the length of the sum of the right-angled sides of two right-angled trapezoids of which lower sides are the same, the upper sides are the same but the right-angled sides are different. This structure ensures that the first helical conical surface of the truncated cone body 721, the second helical conical surface of the truncated cone body 722, the first helical conical surface of the tapered hole 421 and the second helical conical surface of the tapered hole 422 have sufficient length. Thereby, when the conical surface of the bidirectional truncated cone body 72 is matched with the conical surface of the bidirectional tapered hole 42, it ensures sufficient effective contact area and strength as well as the efficiency required for helical movement.

[0066] For the connection pair of dumbbell-like shape asymmetric bidirectional tapered threads, when the right-angled trapezoidal combined body makes one revolution at a constant speed, the axially moving distance of the right-angled trapezoidal combined body is equal to the length of the sum of the right-angled sides of two right-angled trapezoids of which lower sides are the same, the upper sides are the same but the right-angled sides are different. This structure ensures that the first helical conical surface of the truncated cone body 721, the second helical conical surface of the truncated cone body 722, the first helical conical surface of the tapered hole 421 and the second helical conical surface of the tapered hole 422 have sufficient length. Thereby, when the conical surface of the bidirectional truncated cone body 72 is matched with the conical surface of the bidirectional tapered hole 42, it ensures sufficient effective contact area and strength as well as the efficiency required for helical movement.

[0067] 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. Preferably, the first helical conical surface of the truncated cone body 721, the second helical conical surface of the truncated cone body 722, the first helical conical surface of the tapered hole 421, and the second helical conical surface of the tapered hole 422 are continuous helical surfaces.

[0068] 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 2 connecting hole cannot be rotated in the opposite direction into the screw-in end of the cylindrical body 2.

[0069] For the above-mentioned connection pair of dumbbell-like shape asymmetric bidirectional tapered threads, 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.

[0070] 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

[0071] 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 the small diameter of the external thread 9 is processed by an external helical structure connected with a groove 91. The external helical structure is a special outer helical line 8. The major diameter of the internal thread 6, that is, the junction of adjacent helical conical surfaces, is processed by an internal helical structure connected with a groove 61. The internal helical structure is a special inner helical line 5, which can avoid interference when the internal thread 6 and the external thread 9 are screwed together, and can also store oil and dirt.

Embodiment 3

[0072] As shown in FIG. 5, the structure, principle, and implementation steps of this embodiment are similar to those of Embodiment 1. The difference is that the major diameter of the external thread 9, that is, the junction of adjacent helical conical surfaces, is processed by an external helical structure connected with a flat top or arc 92. The external helical structure is a special outer helical line 8. The small diameter of the internal thread 6 is processed by an internal helical structure connected with a flat top or arc 62. The internal helical structure is a special inner helical line 5, which can avoid interference when the internal thread 6 and the external thread 9 are screwed together, and can also store oil and dirt.

Embodiment 4

[0073] As shown in FIG. 6, the structure, principle, and implementation steps of this embodiment are similar to those of embodiment 1. The differences are as follows. The small diameter of the external thread 9 is processed by an external helical structure connected with a groove 91. The major diameter of the external thread 9, that is, the junction of adjacent helical conical surfaces, is processed by an external helical structure connected with a flat top or arc 92. The external helical structure is a special outer helical line 8. The major and small diameters of the internal thread 6 forming the thread pair 10 are connected by sharp corner, which can avoid the possible R angle that make up the thread pair 10. It can also avoid interference when the internal thread 6 and the external thread 9 are screwed together, and can also store oil and dirt.

Embodiment 5

[0074] As shown in FIG. 7, the structure, principle, and implementation steps of this embodiment are similar to those of embodiment 1. The differences are as follows. The major diameter of the internal thread 6, that is, the junction of adjacent helical conical surfaces, is processed by an internal helical structure connected with a groove 61. The small diameter of the internal thread 6, that is, the junction of adjacent helical conical surfaces, is processed by an internal helical structure connected with a flat top or arc 62. The internal helical structure is a special inner helical line 5. The major and small diameters of the external thread 9 forming the thread pair 10 are connected by sharp corner, which can avoid the possible R angle that make up the thread pair 10. It can also avoid interference when the internal thread 6 and the external thread 9 are screwed together, and can also store oil and dirt.

[0075] 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.

[0076] 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, conical surface 42 of the tapered hole, first helical cone surface of the tapered hole 421, first taper angle 1, second helical cone surface of the tapered hole 422, second taper angle 2, internal helical line 5, internal thread 6, bidirectional conical internal thread groove 61, bidirectional conical internal thread flat top or arc 62, truncated cone body 7, bidirectional truncated cone body 71, cone surface of bidirectional truncated cone body 72, first helical conical surface 721 of the truncated cone body, 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, bidirectional conical external thread groove 91, bidirectional conical external thread flat top or arc 92, 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, and sliding bearing pair, 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.