DUMBBELL-LIKE SHAPED ASYMMETRIC BIDIRECTIONAL TAPERED THREAD CONNECTION PAIR

Abstract

The disclosure belongs to the technical field of general technology of devices, and relates to a dumbbell-like shaped asymmetric bidirectional tapered thread connection pair, solving the problems of self-positioning and self-locking performances of the threads. An internal thread (6) is a bidirectional tapered hole (41) (non-entity space) on the inner surface of a cylindrical body (2), and an external thread (9) is bidirectional truncated cone body (71) (material entity) on the outer surface of a columnar body (3). A complete unit thread comprises a helical dumbbell-shaped (94) bidirectional tapered body having the left taper (95) greater than or smaller than the right taper (96) and being small in the middle and large in two ends.

Claims

1. A dumbbell-like shaped asymmetric bidirectional tapered thread connection pair, comprising an external thread (9) and an internal thread (6) which are in mutual thread fit, wherein the complete unit thread of the dumbbell-like (94) shaped asymmetric bidirectional tapered internal thread (1) is a helical dumbbell-like (94) shaped asymmetric bidirectional tapered thread which is small in the middle and large in two ends, has a left taper (95) being larger than a right taper (96) and/or left taper (95) being smaller than 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 a helical bidirectional tapered hole (41) on the inner surface of the cylindrical body (2) and exists in a form of non-entity space; the thread body of the external thread (9) is a 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), 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 cone bodies in the tapered holes until 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, the left taper (95) is larger than the right taper (96), preferably, 0<first taper angle (1)<53, 0<second taper angle (2)<53, for individual special fields, preferably, 53first taper angle (1)<180; the left taper (5) is smaller than the right taper (96), preferably, 0<first taper angle (1)<53, 0<second taper angle (2)<53, for individual special fields, preferably, 53second taper angle (2)<180.

2. The thread connection pair according to claim 1, wherein the dumbbell-like (94) shaped bidirectional tapered internal thread (6) comprises the left conical surface namely a tapered hole first helical conical surface (421) and 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) 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 the central axis of the cylindrical body (2); wherein the 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 bottom sides and upper bottom sides, but different right-angled sides; wherein the two right-trapezoids are coincident with the central axis of the cylindrical body (2); the dumbbell-like (94) shaped bidirectional tapered external thread (9) comprises a left conical surface namely a truncated cone body first helical conical surface (721) and 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) is the same as the shape of a helical outer flank of the rotating body, wherein the rotating body is formed by two bevels of a 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 constant speed along the central axis of the columnar body (3); wherein the 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 bottom sides and upper bottom sides but different right-angled sides; wherein the two right-trapezoids are coincident with the central axis of the columnar body (3).

3. The thread connection pair according to claim 2, wherein 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 the two right-angled trapezoids of the right-angled trapezoid union.

4. The thread connection pair according to claim 2, wherein 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 of the right-angled trapezoid union.

5. The thread connection pair according to claim 1, wherein 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 non-continuous helical surfaces; the truncated cone body first helical conical surface (721), and the truncated cone body second helical conical surface (722) and the outer helical line (8) are all continuous helical surfaces or non-continuous helical surfaces.

6. The connection pair according to claim 1, wherein the dumbbell-like (94) 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 (41); the dumbbell-like (94) shaped bidirectional tapered external thread (9) is formed by oppositely jointing two symmetrical upper bottom sides 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 lower bottom surafces of the two truncated cone bodies (7) are located at two ends of the bidirectional truncated cone body (71), and are respectively jointed with the lower bottom surfaces of the adjacent bidirectional truncated cone bodies (71).

7. The thread connection pair according to claim 1, wherein the large diameter of the external thread (9) adopts an outer sharp-angle-shaped structure, the small diameter of the external thread (9) adopts an inner sharp-angle-shaped structure, the large diameter of the internal thread (6) adopts an inner sharp-angle-shaped structure, the small diameter of the internal thread (6) adopts an outer sharp-angle-shaped structure and/or the small diameter of the external thread (9) is processed by using a groove (91) structure, the large diameter of the internal thread (6) is processed by using a groove (61) structure, the large diameter of the external thread (9) and the small diameter of the internal thread (6) maintain a sharp-angle structure and/or the large diameter of the external thread (9) is processed by using a plane or arc (92) structure, the small diameter of the internal thread (6) is processed by using a plane or arc (62) structure, the small diameter of the external thread (9) and the large diameter of the internal thread (6) maintain the sharp-angle structure and/or the small diameter of the external thread (6) is processed by using a groove (91) structure, the large diameter of the internal thread (6) is processed by using a groove (61) structure, the large diameter of the external thread (9) is processed by using the plane or arch (92) structure, and the small diameter of the internal thread (6) is processed by using the plane or arc (62) structure.

8. The thread connection pair according to claim 1, wherein when the internal thread (6) and the external thread (9) constitute a thread pair (10), the thread pair (10) is formed by conical pairs constituted by mutual fixed-diameter fit between a helical bidirectional tapered hole (41) and a helical bidirectional truncated cone body (71) under the guidance of a helical line, and a clearance (101) is formed between the helical bidirectional truncated cone body (71) and the bidirectional tapered hole (41), each internal thread (6) contains a corresponding external thread (9) to constitute a pair of sliding bearings via coaxial centring and sizing, the entire thread connection pair (10) is composed by a pair or a plurality of pairs of sliding bearings, the internal thread (6) and the external thread (9) are effectively and bi-directionally jointed, namely, the pitch number of effectively and bi-directionally cohered contained-containing threads is designed according to application work conditions, the truncated cone body (7) of the external thread (9) is bi-directionally contained in the tapered hole (4) of the internal thread (6) and positioned in multiple directions such as radial, circumferential, axial and angular directions, and each internal thread (6) and each external thread (9) comprises bidirectional bearing in one side and/or bidirectional bearing at left and right sides.

9. The thread connection pair 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 mutually matched use contact surfaces as support surfaces, and the internal and external diameters of the inner cone and the outer cone are centered under the guidance of the helical line until 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 until fixed-diameter self-positioning contact and/or until fixed-diameter interference contact to generate self locking.

10. The thread connection pair according to claim 1, wherein the columnar body (3) is solid or hollow, comprising cylindrical and/or non-cylindrical workpieces and objects which need to be machined with the bidirectional external thread (9) on the outer surfaces, the cylindrical body (2) comprises cylindrical and/or non-cylindrical workpieces and objects which need to be machined with the bidirectional internal thread (6) on the inner surface, and the inner surface and/or outer surface comprises surface geometry shapes such as a cylindrical surface and/or non-cylindrical surface such as conical surface.

11. The thread connection pair according to claim 1, wherein the internal thread (6) and/or 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

[0042] FIG. 1 is a diagram of a dumbbell-like (left taper is greater than right taper) shaped asymmetric bidirectional tapered thread connection pair in embodiment 1 provided by the disclosure.

[0043] FIG. 2 is a structural diagram of a dumbbell-like (left taper is greater than right taper) shaped asymmetric bidirectional tapered thread external thread and a complete unit thread of the external thread in embodiment 1 provided by the disclosure.

[0044] FIG. 3 is a structural diagram of a nut body of an internal thread of a dumbbell-like (left taper is greater than right taper) shaped asymmetric bidirectional tapered thread and a complete unit thread of an internal thread in embodiment 1 provided by the disclosure.

[0045] FIG. 4 is a structural diagram of a dumbbell-like (left taper is greater than right taper) shaped asymmetric bidirectional tapered thread connection pair in embodiment 2 provided by the disclosure.

[0046] FIG. 5 is a structural diagram of a dumbbell-like (left taper is greater than right taper) shaped asymmetric bidirectional tapered thread connection pair in embodiment 3 provided by the disclosure.

[0047] FIG. 6 is a structural diagram of a dumbbell-like (left taper is greater than right taper) shaped asymmetric bidirectional tapered thread connection pair in embodiment 4 provided by the disclosure.

[0048] FIG. 7 is a structural diagram of a dumbbell-like (left taper is greater than right taper) shaped asymmetric bidirectional tapered thread connection pair in embodiment 5 provided by the disclosure.

[0049] FIG. 8 is a structural diagram of a dumbbell-like (left taper is smaller than right taper) shaped asymmetric bidirectional tapered thread connection pair in embodiment 6 provided by the disclosure.

[0050] FIG. 9 is a structural diagram of a dumbbell-like (left taper is smaller than right taper) shaped asymmetric bidirectional tapered thread external thread and an external thread complete unit thread in embodiment 6 provided by the disclosure.

[0051] FIG. 10 is a structural diagram of a dumbbell-like (left taper is smaller than right taper) shaped asymmetric bidirectional tapered thread internal thread and an internal thread complete unit thread in embodiment 6 provided by the disclosure.

[0052] FIG. 11 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.

[0053] FIG. 12 is a diagram of bevel slider model based on the existing thread technology principle-bevel principle in the background technology of the disclosure.

[0054] FIG. 13 is a diagram of lead angle in the existing thread technology in the background technology of the disclosure.

[0055] In the figures, tapered thread 1, cylindrical body 2, nut body 21, columnar body 3, screw body 31, tapered hole 4, bidirectional tapered hole 41, 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, bidirectional tapered internal thread groove 61, bidirectional tapered internal thread plane or arc 62, 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, bidirectional tapered external thread groove 91, bidirectional tapered external thread plane or arc 92, dumbbell-like 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, 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

[0056] The disclosure will be further described in detail in combination with drawings and embodiments below.

Embodiment 1

[0057] As shown in FIG. 1, FIG. 2 and FIG. 3, the dumbbell-like shaped asymmetric bidirectional tapered thread connection pair includes 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 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 until interference fit, that is, the bidirectional tapered hole 41 receives 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 received and limited, helical movement also allows the asymmetric bidirectional tapered thread connection pair 10 to acquire necessary order freedom degree, so as to effectively synthesize the technical features of the cone pair and the thread pair.

[0058] When the dumbbell-like shaped asymmetric bidirectional tapered thread connection pair in this embodiment is used, the bidirectional truncated cone body conical surface 72 and the bidirectional tapered hole conical surface 42 are in mutual fit.

[0059] When the truncated cone body 7 and/or tapered hole 4 of the bidirectional tapered thread connection pair in this embodiment reaches a certain taper, that is, the cone constituting the cone pair reaches a certain taper angle, the bidirectional tapered thread connection pair 10 has self-locking property and self-positioning property. The taper includes left taper 95 and right taper 96. The left taper 95 corresponds to the left taper angle namely first taper angle 1, the right taper 96 corresponds to the right taper angle namely second taper angle 2. When the left taper 95 is larger than the right taper 96 in the asymmetric bidirectional thread 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; preferably, 0<second taper angle 1<53, preferably, the second taper angle 2 is 240.

[0060] The external thread 9 is arranged on the outer surface of the columnar body 3, which is characterized in that 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 a dumbbell-like 94 shaped special bidirectional tapered geometry. The columnar body 3 can be solid or hollow, including a cylinder, a cone, a tube and the like.

[0061] The dumbbell-like 94 shaped asymmetric bidirectional truncated cone body 71 is formed by oppositely jointing two symmetrical upper bottom sides 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 lower bottom 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 lower bottom surfaces of the adjacent bidirectional truncated cone bodies 71. The outer surface of the truncated cone body 7 is provided with an 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 passing through the thread axis 02, the complete single asymmetric bidirectional tapered external thread 9 is a dumbbell-like 94 shaped special bidirectional conical geometry which is small in the middle and large in two ends and has the taper of the left truncated cone body being larger than that of the right truncated cone body. The included angle formed by two tessellation limes of the left conical surface namely truncated cone body first helical conical surface 721 of the asymmetric bidirectional truncated cone body 71 is the first taper angle 1. The truncated cone body first helical conical surface 721 forms the left taper 95 corresponding to the first taper angle 1 and is in right-direction distribution 98, and the included angle between the two tessellation lines of the right conical surface namely truncated cone body second helical conical surface 722 of the asymmetric bidirectional truncated cone body 71 is the second taper angle 2. The truncated cone body second helical conical surface 722 forms the right taper 96 corresponding to the second taper angle 2 and is in left-direction distribution 97. 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 passing through the cone axis 01. A shape formed by the truncated cone body first helical conical surface (721) and the truncated cone body second helical conical surface (722) is the same as the shape of a helical outer flank of the rotating body, wherein the rotating body is formed by two bevels of a 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 constant speed along the central axis of the columnar body 3; wherein the 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 bottom sides and upper bottom sides but 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 upper bottom sides of two right-angled trapezoids are symmetric and oppositely jointed, and the lower bottom sides are respectively at the two ends of the right-angled trapezoid union.

[0062] The internal thread 6 is arranged on the inner surface of the cylindrical body 2, the cylindrical body 2 includes a nut body 21, the inner surface of the nut body 21 is 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 a dumbbell-like 93 shaped special bidirectional tapered geometry, and the cylindrical body 2 includes cylindrical and/or non-cylindrical workpieces and objects which need to be machined with internal threads on their inner surfaces.

[0063] The dumbbell-like 94 shaped asymmetric bidirectional tapered hole 41 is 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, 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 passing through the thread axis 02, the complete single-pitch asymmetric bidirectional tapered internal thread 6 is a dumbbell-like 94 shaped special bidirectional conical geometry which is small in the middle and large in two ends and has the taper of the left tapered hole being larger than that of the right tapered hole. The included angle formed by two tessellation limes of the left conical surface namely tapered hole first helical conical surface 421 of the bidirectional tapered hole 41 is the first taper angle 1. The tapered hole first helical conical surface 421 forms the left taper 95 corresponding to the first taper angle 1 and is in right-direction distribution 98, and the included angle between the two tessellation lines of the right conical surface namely tapered hole second helical conical surface 422 of the bidirectional tapered hole 41 is the second taper angle 2. The tapered hole second helical conical surface 422 forms the right taper 96 corresponding to the second taper angle 2 and is in left-direction distribution 97. 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 passing through the cone axis 01. 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 the central axis of the cylindrical body 2; wherein the 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 bottom sides and upper bottom sides, but 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 lower bottom sides are the same and upper bottom sides are the same but right-angled sides are different, and the upper bottom sides of two right-angled trapezoids are symmetric and oppositely jointed, and the lower bottom sides are respectively at the two ends of the right-angled trapezoid union.

[0064] In the bidirectional thread connection pair in this embodiment, the adjacent helical conical surface junction of the external thread 9 and the adjacent helical conical surface junction of the internal thread 6 adopt sharp angle connection forms, the sharp angle, relative to the non-sharp angle, refers to a structure form processed by the non-sharp angle.

[0065] For the dumbbell-like 94 shaped bidirectional truncated cone body 71 and bidirectional tapered hole 41, at the junction between the truncated cone body first helical conical surface 721 and the truncated cone body second helical conical surface 722 of the same helical bidirectional truncated cone body 71, the small diameter of the external thread 9 is connected by the inner sharp angle structure, and a helically distributed outer helical line 8 is formed; at the junction between the truncated cone body first helical circular conical surface 721 of the same helical bidirectional truncated cone body 71 and the truncated cone body second helical conical surface 722 of the adjacent bidirectional truncated cone body 71 and/or at the junction between the truncated cone body second helical conical surface 722 of the same helical bidirectional truncated cone body 71 and the truncated cone body first helical conical surface 721 of the adjacent bidirectional truncated cone body 71, the large diameter of the external thread 9 is connected by using the outer sharp angle structure and a helically distributed outer helical line 8 is formed; at the junction between the tapered hole first helical conical surface 421 of the same helical bidirectional tapered hole 41 and the tapered hole second helical conical surface 422, the small diameter of the internal thread 6 is connected by using the outer sharp angle shape and a helically distributed inner helical line 5 is formed; at the junction between the tapered hole first helical conical surface 421 of the same helical bidirectional tapered hole 41 and the tapered hole second helical conical surface 422 of the adjacent bidirectional tapered hole 41 and/or at the junction between the tapered hole second helical conical surface 422 of the same helical bidirectional tapered hole 41 and the tapered hole first helical conical surface 421 of the adjacent bidirectional tapered hole 41, the large diameter of the internal thread 6 is connected by using the inner sharp angle structure and a helically distributed inner helical line 5 is formed. The thread structure 1 is more compact, higher in strength, large in bearing force, has good mechanical connection, locking property, sealing property and spacious tapered thread processing physical space.

[0066] When being in transmission connection, the dumbbell-like shaped asymmetric bidirectional tapered thread connection pair is in bidirectional bearing through screw connection of the bidirectional tapered hole 41 and the bidirectional truncated cone body 71. When the external thread 9 and the internal thread 6 constitute the thread pair 10, there must be a clearance 101 between the internal thread 6 and the external thread 9, that is, there must be a clearance 101 between the bidirectional truncated cone body 71 and the bidirectional tapered hole 41. The clearance 101 is beneficial to formation of the bearing oily film. The asymmetric bidirectional 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 contains 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 tapered 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, the bidirectional outer cone 9 is received through the bidirectional inner cone 6 and is positioned in multiple directions such as radial, axial, angular and circumferential directions, so as to ensure the accuracy, efficiency and reliability of the transmission connection of the bidirectional tapered thread connection pair 10.

[0067] When the dumbbell-like shaped asymmetric bidirectional tapered connection pair in this embodiment is in fastening connection and in seal connection, its technical performances are realized by screw connection of the bidirectional tapered hole 41 and the bidirectional truncated cone body 71, that is, are 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 until the tapered hole first helical conical surface 421 and the truncated cone body first helical conical surface 721 are cohered until interference contact and/or the tapered hole second helical conical surface 422 and the truncated cone body second helical conical surface 722 are cohered until interference contact, thereby realizing connection, locking, loosening prevention, bearing, fatigue, sealing and other technical performances of mechanical mechanisms.

[0068] Therefore, transmission accuracy, transmission effectiveness, bearing capability, self-locking force, loose prevention capability, sealing property and other technical properties of the dumbbell-like shaped asymmetric tapered thread connection pair 10 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 formed left taper 95 namely first taper angle 1 and the tapered hole second helical conical surface 422 and its formed 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.

[0069] In the above dumbbell-like shaped asymmetric bidirectional thread connection pair, 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 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 matched.

[0070] In the above dumbbell-like shaped asymmetric bidirectional thread connection pair, 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 matched.

[0071] In the above dumbbell-like shaped asymmetric bidirectional tapered thread connection pair, 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 non-continuous 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 non-continuous helical surfaces.

[0072] In the above bidirectional tapered thread connection pair, 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 in along the opposition direction.

[0073] In the above dumbbell-like shaped asymmetric bidirectional tapered thread connection pair, 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.

[0074] Compared with the prior art, the dumbbell-like shaped asymmetric bidirectional tapered thread connection pair 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 conical pair formed by inner and outer cones until interference fit.

Embodiment 2

[0075] 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 the small diameter of the external thread 9 is processed by using the outer helical structure connected with the groove 91, the outer helical structure is a special helical line 8, the large small of the internal thread 6 namely the junction of adjacent helical conical surfaces is processed by using the inner helical structure connected with the groove 61, the inner helical structure is a special helical line 5, interference is avoided to be generated when the internal thread 6 and the external thread 9 are screwed, and oil and dirt can also be stored.

Embodiment 3

[0076] 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 large diameter of the external thread 9 namely the junction of adjacent helical conical surfaces is processed by using the outer helical line structure connected with the plane or arc 92, the outer helical structure is a special helical line 8, the small diameter of the internal thread 6 is processed by using the inner helical structure connected with the plane or arc 62, the inner helical structure is a special helical line 5, interference is avoided to be generated when the internal thread 6 and the external thread 9 are screwed, and oil and dirt can also be stored.

Embodiment 4

[0077] As shown in FIG. 6, the structure, principle and implementation steps of this embodiment are the same as those in embodiment 1. The difference is that the small diameter of the external thread 9 is processed by using the outer helical line structure connected with the groove 91, the large diameter of the external thread 9 namely the junction of adjacent helical conical surfaces is processed by using the outer helical structure connected with the plane or arc 92, the outer helical structure is a special helical line 8, the large diameter and small diameter of the internal thread 6 constituting the thread pair 10 together with the external thread are connected by using sharp angles, R angle possibly existing when the thread pair 10 is formed can be avoided, interference is avoided when the internal thread 6 and the external thread 9 are screwed, and oil and dirt can also be stored.

Embodiment 5

[0078] As shown in FIG. 7, the structure, principle and implementation steps of this embodiment are the same as those in embodiment 1. The difference is that the large diameter of the internal thread 6 namely the junction of adjacent helical conical surfaces is processed by using the inner helical line structure connected with the groove 61, the small diameter of the internal thread 6 is processed by using the inner helical structure connected with the plane or arc 62, the inner helical structure is a special helical line 5, the large diameter and small diameter of the external thread 9 constituting the thread pair 10 together with the external thread are connected by using sharp angles, R angle possibly existing when the thread pair 10 is formed can be avoided, interference is avoided when the internal thread 6 and the external thread 9 are screwed, and oil and dirt can also be stored.

Embodiment 6

[0079] As shown in FIG. 8, FIG. 9 and FIG. 10, the structure, principle and implementation steps of this embodiment are similar to those of embodiments 1, 2, 3, 4 and 5. The difference is that the asymmetric bidirectional tapered thread 1 has the left taper 95 being smaller than the right taper 96, preferably, 0<first taper angle 1<53, preferably, the first taper angle 1 is 240; preferably, 0<second taper angle 2<53, preferably, the second taper angle 2 is 240, for individual special fields, preferably, 53second taper angle 2<180, preferably, the second taper angle 1 is 5390.

[0080] 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.

[0081] Although the present application uses terms such as tapered thread 1, cylindrical patent body 2, nut body 21, 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, bidirectional tapered internal thread groove 61, bidirectional tapered internal thread plane or arc 62, 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, bidirectional tapered external thread groove 91, bidirectional tapered external thread plane or arc 92, dumbbell-like 94, 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, axle sleeve, shaft, non-entity space, material entity, 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, but are not exclusive of other terms, and 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.