DUMBBELL-LIKE AND OLIVE-LIKE ASYMMETRICAL BIDIRECTIONAL TAPERED THREAD CONNECTION PAIRS

Abstract

The present disclosure belongs to the technical field of general technology of devices, and relates to olive-like and dumbbell-like asymmetric bidirectional tapered thread connection pairs, which solve the problems of poor self-positioning and self-locking performance of existing threads. An internal thread (6) is a bidirectional tapered hole (41) (non-entity space) in an inner surface of a cylindrical body (2); an external thread (9) is a bidirectional truncated cone body (71) (material entity) on an outer surface of a columnar body (3); and a complete unit thread is a bidirectional tapered body in an olive-like shape (93) and with a left taper (95) greater than a right taper (96) and/or in a dumbbell-like (94) shape and with the left taper (95) smaller than the right taper (96).

Claims

1. A dumbbell-like shaped and olive-like shaped asymmetric bidirectional tapered thread connection pair, comprising an external thread (9) and an internal thread (6) which are in mutual threaded fit; wherein a complete unit thread of the asymmetric bidirectional tapered thread (1) comprises a bidirectional tapered body in an olive-like shape (93) and/or in a dumbbell-like shape (94); the bidirectional tapered body comprises a bidirectional tapered hole (41) and/or a bidirectional truncated cone body (71); a thread body of the internal thread (6) is a cylindrical body (2) with a helical inner surface, comprises a bidirectional tapered hole in the olive-like shape (93) and/or in the dumbbell-like shape (94) and exists in the form of a non-entity space; a thread body of the external thread (9) is a columnar body (3) with a helical outer surface, comprises a bidirectional truncated cone body (71) in the olive-like shape (93) and/or in the dumbbell-like shape (94) and exists in the form of a material entity; the left taper (95) formed by the left conical surface of the bidirectional tapered body corresponds to a first taper angle (1), and the right taper (96) formed by the right conical surface corresponds to a second taper angle (2); the internal thread (6) and the external thread (9) contains the tapered body through the tapered hole until an inner conical surface and an outer conical surface bear each other.

2. The thread connection pair according to claim 1, wherein the bidirectional tapered internal thread (6) in the dumbbell-like shape (94) 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 first shape formed by the first helical conical surface (421) of the tapered hole and the second helical conical surface (422) of the tapered hole 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 second shape formed by the first helical conical surface (721) of the truncated cone body and the second helical conical surface (722) of the truncated cone body, 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 thread connection pair according to claim 1, wherein the bidirectional tapered internal thread (6) in the olive-like shape (93) 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 first rotating body, wherein the first rotating body is formed by a first right-angled trapezoid union being rotated around a right-angled side of the first right-angled trapezoid union, and, at the same time, the first right-angled trapezoid union axially moves at a constant speed along a central axis of the cylindrical nut (2); wherein the first right-angled trapezoid union is formed by oppositely jointing two symmetrical lower 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 bidirectional tapered 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 a shape of a helical outer flank of the rotating body, wherein the rotating body is formed by the first right-angled trapezoid union being rotated around the first right-angled side of the first right-angled trapezoid union, and, at the same time, the first right-angled trapezoid union axially moves at constant speed along the central axis of the columnar body (3); wherein the first right-angled trapezoid union is formed by oppositely jointing two symmetrical lower 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 columnar body (3).

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 at least double the length of the sum of the right-angled sides of two right-angled trapezoids of the right-angled trapezoid union.

5. 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 the length of the sum of the right-angled sides of two right-angled trapezoids of the right-angled trapezoid union.

6. The thread connection pair 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, 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.

7. The thread connection pair according to claim 1, the dumbbell-like shaped bidirectional tapered 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 olive-like shaped bidirectional tapered internal thread (6) is formed by oppositely jointing two symmetrical lower sides of two tapered holes, wherein the two tapered holes have identical lower sides and upper sides, and same and/or different taper height; wherein the upper sides of the two tapered holes are located at two ends of the bidirectional tapered holes (41), and are respectively jointed with the upper side of the adjacent bidirectional tapered holes; the dumbbell-like shaped bidirectional tapered external thread (9) is formed by oppositely jointing two symmetrical upper 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; the olive-like shaped bidirectional tapered external thread (9) is formed by oppositely jointing two symmetrical lower 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 upper 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 upper side of the adjacent bidirectional truncated cone bodies.

8. The thread connection pair according to claim 1, wherein the mutual thread fit of the internal thread (6) and the external thread (9) which form the thread pair (10) comprises different combinations such as the external thread (9) in the olive-like shape (93) with the left taper (95) smaller than the right taper (96) and the internal thread (6) in the dumbbell-like shape (94) with the left taper (95) greater than the right taper (96), and/or the external thread (9) in the dumbbell-like shape (94) with the left taper (95) greater than the right taper (96) and the internal thread (6) in the olive-like shape (93) with the left taper (95) smaller than the right taper (96).

9. The thread connection pair according to claim 1, wherein the internal thread (6) and the external thread (9) form the helical bidirectional tapered hole (41) and the helical bidirectional truncated cone body (71) are in fit under the guidance of the helical line to form cone pairs in pitches to form the thread pair (10); a clearance (101) is reserved between the bidirectional truncated cone body (71) and the bidirectional tapered hole (41); each pitch of internal thread (6) contains a corresponding pitch of external thread (9) for coaxial centering and to form a pair of sliding bearings; the whole thread connection pair (10) is composed of one or several pairs of sliding bearings; the number of the effective bidirectional joining (effective bidirectional contact) jointed containing and contained thread pitches of the internal thread (6) and the external thread (9) is designed according to the application conditions; and through the bidirectional containment of the truncated cone bodies (7) of the external thread (9) by the tapered hole (4) of the internal thread (6) and the positioning in multiple directions such as radial, circumferential, axial and angular directions, each pitch of internal thread (6) and external thread (9) comprises one-side bidirectional bearing and/or bidirectional bearing on left and right sides.

11. The thread connection pair according to claim 1, wherein the internal thread (6) and the external thread (9) form the thread pair (10), i.e., the first helical conical surface (421) of the tapered hole and the second helical conical surface (422) of the tapered hole and the first helical conical surface (721) of the truncated cone body and the second helical conical surface (722) of the truncated cone body matched with each other take the contact surface as the supporting surface to make the inner and outer cones are centered in inner and outer diameters under the guidance of the helical lines until the bidirectional conical surface (42) of the tapered hole is cohered with the bidirectional conical surface (72) of the truncated cone body to achieve one-directional bearing of the helical conical surface and/or bidirectional simultaneous bearing of the helical conical surface and/or until the fit and self-positioning contact and/or until the interference contact to produce self-locking.

12. The thread connection pair according to claim 1, wherein the columnar body (3) may be solid or hollow, comprising cylindrical and/or non-cylindrical workpieces and objects that need to be machined with the bidirectional tapered external threads (9) on the outer surfaces; the cylindrical body (2) comprises cylindrical and/or non-cylindrical workpieces and objects that need to be machined with the bidirectional tapered internal threads (6) on the inner surfaces; and the outer surfaces and/or inner surfaces comprise cylindrical surfaces and/or non-cylindrical surfaces such as conical surfaces, and other geometric shapes.

13. The thread connection pair according to claim 1, wherein the internal thread (6) and/or the external thread (9) comprises that the single pitch of thread body is an incomplete tapered geometry, that is, the single pitch of thread body is an incomplete unit thread.

14. The bidirectional tapered thread according to claim 1, wherein when the left taper (95) is same or approximately same with the right taper (96), the first taper angle (1) is greater than 0 and smaller than 53, and the second taper angle (2) is greater than 0 and smaller than 53; when the left taper (95) is greater than the right taper (96), the first taper angle (1) is greater than 0 and smaller than 53, and the second taper angle (2) is greater than 0 and smaller than 53; when the left taper (95) is smaller than the right taper (96), the first taper angle (1) is greater than 0 and smaller than 53 and the second taper angle (2) is greater than 0 and smaller than 53.

15. The bidirectional tapered thread according to claim 12, wherein when the left taper (95) is same or approximately same with the right taper (96), the first taper angle (1) is greater than or equal to 53 and smaller than 180; the second taper angle (2) is greater than or equal to 53 and smaller than 180; when the left taper (95) is greater than the right taper (96), the first taper angle (1) is greater than or equal to 53 and smaller than 180; when the left taper (95) is smaller than the right taper (96), the second taper angle (2) is greater than or equal to 53 and smaller than 180.

Description

DESCRIPTION OF THE DRAWINGS

[0044] FIG. 1 is a structural schematic diagram of a thread connection pair composed of an olive-like (a left taper is smaller than a right taper) asymmetric bidirectional tapered external thread and a dumbbell-like (the left taper is greater than the right taper) asymmetric bidirectional tapered internal thread according to an embodiment 1 of the present disclosure;

[0045] FIG. 2 is a structural schematic diagram of an external thread of the olive-like (the left taper is smaller than the right taper) asymmetric bidirectional tapered thread and a complete unit thread thereof according to the embodiment 1 of the present disclosure;

[0046] FIG. 3 is a structural schematic diagram of an internal thread of the dumbbell-like (the left taper is greater than the right taper) asymmetric bidirectional tapered thread and a complete unit thread according to the embodiment 1 of the present disclosure;

[0047] FIG. 4 is a structural schematic diagram of a thread connection pair composed of a dumbbell-like (the left taper is greater than the right taper) asymmetric bidirectional tapered external thread and an olive-like (the left taper is smaller than the right taper) asymmetric bidirectional tapered internal thread according to an embodiment 2 of the present disclosure;

[0048] FIG. 5 is a structural schematic diagram of an external thread of the dumbbell-like (the left taper is greater than the right taper) asymmetric bidirectional tapered thread and a complete unit thread thereof according to the embodiment 2 of the present disclosure;

[0049] FIG. 6 is a structural schematic diagram of an internal thread of the olive-like (the left taper is smaller than the right taper) asymmetric bidirectional tapered thread and a complete unit thread according to the embodiment 2 of the present disclosure;

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

[0051] FIG. 8 is a graphic presentation of an inclined plane slider model of the principle of the existing thread technologythe principle of inclined plane involved in the background of the present disclosure; and

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

[0053] 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, conical surface 42 of the bidirectional tapered hole, first helical conical surface 421 of the tapered hole, first taper angle 1, second helical conical surface 422 of the tapered hole, second taper angle 2, internal helical line 5, internal thread 6, truncated cone body 7, bidirectional truncated cone body 71, conical surface 72 of the bidirectional truncated cone body, first helical conical surface 721 of the truncated cone body, first taper angle 1, second helical conical surface 722 of the truncated cone body, second taper angle 2, external helical line 8, external thread 9, olive-like shape 93, 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, cone axis 01, thread axis 02, slider A on the inclined surface, inclined surface B, gravity G, gravity component G1 along the inclined plane, friction force F, thread rise angle , equivalent friction angle P, major diameter d of the traditional external thread, minor diameter d1 of the traditional external thread and pitch diameter d2 of the traditional external thread.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

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

Embodiment 1

[0055] As shown in FIGS. 1, 2 and 3, an asymmetric bidirectional tapered thread connection pair 10 comprises a bidirectional truncated cone body 71 helically distributed on an outer surface of a columnar body 3 and a bidirectional tapered hole 41 helically distributed in an inner surface of a cylindrical body 2, namely, comprises an external thread 9 and an internal thread 6 which are in threaded fitting with each other. The internal thread 6 is distributed as a helical bidirectional tapered hole 41; and the external thread 9 is distributed as a helical bidirectional truncated cone body 71. The internal thread 6 exists in the form of helical bidirectional tapered hole 41 (non-entity space); and the external thread 9 exists in the form of helical bidirectional truncated cone body 71 (material entity). The internal thread 6 and the external thread 9 are subjected to a relationship of containing part and contained part. The threads work in such a state that the internal thread 6 and the external thread 9 are fitted together by screwing bidirectional tapered geometries pitch by pitch till interference fit is achieved, i.e., the bidirectional tapered hole 41 contains the bidirectional truncated cone body 71 pitch by pitch, i.e., the internal thread 6 contains the external thread 9 pitch by pitch. The bidirectional containment limits the disordered degree of freedom between the tapered hole 4 and the truncated cone body 7; the helical movement enables the asymmetric bidirectional tapered thread connection pair 10 to obtain the necessary ordered degree of freedom, thereby effectively synthesizing the technical characteristics of the cone pair and the thread pair.

[0056] When the asymmetric bidirectional tapered thread connection pair 10 in the present embodiment is used, a conical surface 72 of the bidirectional truncated cone body and the conical surface 42 of the bidirectional tapered hole are fitted with each other.

[0057] The asymmetric bidirectional tapered thread connection pair 10 in the present embodiment has the self-locking and self-positioning performances only if the truncated cone body 7 of a bidirectional tapered thread 1 and/or the tapered hole 4 reaches a certain taper, i.e., cone bodies forming the cone pair reach a certain taper angle. The taper comprises a left taper 95 and a right taper 96, i.e., the taper angle comprises a left taper angle and a right taper angle. In the present embodiment, the asymmetric bidirectional tapered external thread 9 is of an olive-like shape 93 and has the left taper 95 smaller than the right taper 96; and the asymmetric bidirectional tapered internal thread 6 is of a dumbbell-like shape 94 and has the left taper 95 greater than the right taper 96. The left taper 95 corresponds to the left taper angle, i.e., a first taper angle 1; and the right taper 96 corresponds to the right taper angle, i.e., a second taper angle 2.

[0058] When the left taper 95 is greater than the right taper 96, it is preferable that the first taper angle 1 is greater than 0 and smaller than 53; and preferably, the first taper angle 1 is 2-40. In individual special fields, it is preferable that the first taper angle 1 is greater than or equal to 53 and smaller than 180; and preferably, the first taper angle 1 is 53-90. It is preferable that the second taper angle 2 is greater than 0 and smaller than 53; and preferably, the second taper angle 2 is 2-40.

[0059] When the left taper 95 is smaller than the right taper 96, it is preferable that the first taper angle 1 is greater than 0 and smaller than 53; and preferably, the first taper angle 1 is 2-40. It is preferable that the second taper angle 2 is greater than 0 and smaller than 53; and preferably, the second taper angle 2 is 2-40. In individual special fields, it is preferable that the second taper angle 2 is greater than or equal to 53 and smaller than 180; and preferably, the second taper angle 2 is 53-90.

[0060] The above-mentioned individual special fields refer to the application fields of thread connection such as transmission connection with low requirements on self-locking performance or even without self-locking performance and/or with low requirements on self-positioning performance and/or with high requirements on axial bearing capacity and/or with indispensable anti-locking measures.

[0061] The external thread 9 is arranged on the outer surface of the columnar body 3. The columnar body 3 is provided with a screw body 31; the truncated cone body 7 is helically distributed on the outer surface of the screw body 31; and the truncated cone body 7 comprises the asymmetric bidirectional truncated cone body 71, which is a special bidirectional tapered geometry in the olive-like shape 93 and the left taper 95 smaller than the right taper 96. The columnar body 3 may be solid or hollow, comprising cylinders, cones, tubes and the like.

[0062] The asymmetric bidirectional truncated cone body 71 in the olive-like shape 93 is formed by symmetrically and oppositely jointing lower bottom surfaces of two truncated cone bodies with the same lower bottom surfaces and upper top surfaces and different cone heights. Namely, when the lower bottom surfaces of two truncated cone bodies with the same lower bottom surfaces and upper top surfaces and different cone heights are jointed with each other, and the upper top surfaces are located at both ends of the bidirectional truncated cone body 71 to form the asymmetric bidirectional tapered thread 1, the process comprises that the lower bottom surfaces are respectively jointed with the upper top surfaces of the adjacent bidirectional truncated cone bodies 71 and/or to be respectively jointed with the upper top surfaces of the adjacent bidirectional truncated cone bodies 71. The outer surface of the truncated cone body 7 comprises the conical surface 72 of the asymmetric bidirectional truncated cone body. 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, which form an asymmetric bidirectional tapered external thread 9. In the cross section through which the thread axis passes through, a complete single-pitch asymmetric bidirectional tapered external thread 9 is a special bidirectional tapered geometry in the olive-like shape 93 and with a large middle and two small ends. The angle formed between two plain lines of the left conical surface of the asymmetric bidirectional truncated cone body 71, i.e., the first helical conical surface 721 of the truncated cone body, is the first taper angle 1, i.e., the left taper angle corresponding to the left taper 95 of the external thread 9 of the asymmetric bidirectional tapered thread. The left taper 95 is subjected to a left-direction distribution 97. The angle formed between the two plain lines of the right conical surface of the asymmetric bidirectional truncated cone body 71, i.e., the second helical conical surface 722 of the truncated cone body, is the second taper angle 2, i.e., the right taper angle corresponding to the right taper 96 of the external thread 9 of the asymmetric bidirectional tapered thread. The right taper 96 is subjected to a right-direction distribution 98. The taper directions corresponding to the first taper angle 1 and the second taper angle 2 are opposite. The plain line is an intersection line of the conical surface and the plane through which the cone axis passes through. The shape formed by the first helical conical surface 721 and the second helical conical surface 722 of the truncated cone body of the bidirectional truncated cone body 71 is the same as the shape of a helical outer flank of a rotating body, which circumferentially rotates at a constant speed by using a right-angled side of a right-angled trapezoid union as a rotating center and is formed by two hypotenuses of the right-angled trapezoid union when the right-angled trapezoid union axially moves at a constant speed along a central axis of the columnar body 3. The right-angled side is coincident with the central axis of the columnar body 3; and the right-angled trapezoid union is formed by symmetrically and oppositely jointing lower bottom sides of two right-angled trapezoids with the same lower bottom sides and upper sides and different right-angled sides. The right-angled trapezoid union refers to a special geometry, which is formed by symmetrically and oppositely jointing the lower bottom sides of two right-angled trapezoids with the same lower bottom sides and upper sides and different right-angled sides and has the upper sides respectively located at both ends of the right-angled trapezoid union. The left taper 95 is formed by the first helical conical surface 721 of the truncated cone body and corresponds to the first taper angle 1 of the asymmetric bidirectional tapered external thread 9, i.e., the left taper angle corresponding to the left taper 95 of the external thread 9 of the asymmetric bidirectional tapered thread. The left taper 95 is subjected to the left-direction distribution 97. The right taper 96 is formed by the second helical conical surface 722 of the truncated cone body and corresponds to the second taper angle 2 of the asymmetric bidirectional tapered external thread 9, i.e., the right taper angle corresponding to the right taper 96 of the external thread 9 of the asymmetric bidirectional tapered thread. The right taper 96 is subjected to the right-direction distribution 98. The taper directions corresponding to the first taper angle 1 and the second taper angle 2 are opposite.

[0063] The internal thread 6 is arranged on the inner surface of the cylindrical body 2. The cylindrical body 2 is provided with a nut body 21; and the tapered hole 4 is helically distributed in the inner surface of the nut body 21, comprising the asymmetric bidirectional tapered hole 41. The asymmetric bidirectional tapered hole 41 is a special bidirectional tapered geometry in the dumbbell-like shape 94 and with the left taper 95 greater than the right taper 96. The cylindrical body 2 comprises cylindrical and/or non-cylindrical workpieces and objects which need to be machined with the internal threads on the inner surfaces.

[0064] The asymmetric bidirectional tapered hole 41 in the dumbbell-like shape 94 is formed by symmetrically and oppositely jointing upper top surfaces of two tapered holes with the same lower bottom surfaces and upper top surfaces and different cone heights. Namely, when the upper top surfaces of two tapered holes with the same lower bottom surfaces and upper top surfaces and different cone heights are jointed with each other, and the lower bottom surfaces are located at both ends of the bidirectional tapered hole 41 to form the asymmetric bidirectional tapered thread 1, the process comprises that the upper top surfaces are respectively jointed with the lower bottom surfaces of the adjacent bidirectional tapered holes 41 and/or to be respectively jointed with the lower bottom surfaces of the adjacent bidirectional tapered holes 41. The tapered hole 4 comprises the conical surface 42 of the asymmetric bidirectional tapered hole. The internal thread 6 comprises the first helical conical surface 421 of the tapered hole, the second helical conical surface 422 of the tapered hole and the internal helical line 5, which form the asymmetric bidirectional tapered internal thread 6. In the cross section through which the thread axis passes through, the complete single-pitch asymmetric bidirectional tapered internal thread 6 is a special bidirectional tapered geometry in the dumbbell-like shape 94 and with a small middle and two large ends. The angle formed by the two plain lines of the left conical surface of the bidirectional tapered hole 41, i.e., the first helical conical surface 421 of the tapered hole, is the first taper angle 1, i.e., the left taper angle corresponding to the left taper 95 of the internal thread 6 of the asymmetric bidirectional tapered thread. The left taper 95 is subjected to the right-direction distribution 98. The angle formed by the two plain lines of the right conical surface of the bidirectional tapered hole 41, i.e., the second helical conical surface 422 of the tapered hole, is the second taper angle 2, i.e., the right taper angle corresponding to the right taper 96 of the internal thread 6 of the asymmetric bidirectional tapered thread. The right taper 96 is subjected to the left-direction distribution 97. The taper directions corresponding to the first taper angle 1 and the second taper angle 2 are opposite. The plain line is an intersection line of the conical surface and the plane through which the cone axis passes through. The shape formed by the first helical conical surface 421 and the second helical conical surface 422 of the tapered hole of the bidirectional tapered hole 41 is the same as the shape of a helical outer flank of a rotating body, which circumferentially rotates at a constant speed by using a right-angled side of a right-angled trapezoid union as a rotating center and is formed by two hypotenuses of the right-angled trapezoid union when the right-angled trapezoid union axially moves at a constant speed along a central axis of the cylindrical body 2. The right-angled side is coincident with the central axis of the cylindrical body 2; and the right-angled trapezoid union is formed by symmetrically and oppositely jointing upper sides of two right-angled trapezoids with the same lower bottom sides and upper sides and different right-angled sides. The right-angled trapezoid union refers to a special geometry, which is formed by symmetrically and oppositely jointing the upper sides of two right-angled trapezoids with the same lower bottom sides and upper sides and different right-angled sides and has the lower bottom sides respectively located at both ends of the right-angled trapezoid union. The left taper 95 is formed by the first helical conical surface 421 of the tapered hole and corresponds to the first taper angle 1 of the asymmetric bidirectional tapered internal thread 6, i.e., the left taper angle corresponding to the left taper 95 of the internal thread 6 of the asymmetric bidirectional tapered thread. The left taper 95 is subjected to the right-direction distribution 98. The right taper 96 is formed by the second helical conical surface 422 of the tapered hole and corresponds to the second taper angle 2 of the asymmetric bidirectional tapered internal thread 6, i.e., the right taper angle corresponding to the right taper 96 of the internal thread 6 of the asymmetric bidirectional tapered thread. The right taper 96 is subjected to the left-direction distribution 97. The taper directions corresponding to the first taper angle 1 and the second taper angle 2 are opposite.

[0065] When the asymmetric bidirectional tapered thread connection pair 10 in the present embodiment is used for transmission connection, the bidirectional bearing is implemented through the screwing connection between the bidirectional tapered hole 41 and the bidirectional truncated cone body 71. When the external thread 9 and the internal thread 6 form the thread pair 10, a clearance 101 must be reserved between the internal thread 6 and the external thread 9, i.e., the clearance 101 must be reserved between the bidirectional truncated cone body 71 and the bidirectional tapered hole 41. If oil and other media exist between the internal thread 6 and the external thread 9 for lubrication, a bearing oil film will be easily formed; and the clearance 101 is beneficial to the formation of the bearing oil film. The asymmetric bidirectional tapered thread connection pair 10 is equivalent to a set of sliding bearing pairs composed of one and/or several pairs of sliding bearings, i.e., each pitch of bidirectional tapered internal thread 6 bidirectionally contains a corresponding pitch of bidirectional tapered external thread 9 to form a pair of sliding bearings. The whole asymmetric bidirectional tapered thread connection pair 10 applied to transmission connection is composed of one or several pairs of sliding bearings. The number of sliding bearings is adjusted according to application conditions. Namely, the number of the effective jointed containing and contained thread pitches of the bidirectional tapered internal thread 6 and the bidirectional tapered external thread 9 is designed according to the application conditions. A special synthesis technology of the cone pair and the thread pair is constituted through the containment of the bidirectional external cone 9 by the bidirectional internal cone 6 and the positioning in multiple directions such as radial, axial, angular and circumferential directions, to ensure the precision, efficiency and reliability of the tapered thread technology, particularly the transmission connection of the asymmetric bidirectional tapered thread connection pair 10.

[0066] When the asymmetric bidirectional tapered thread connection pair 10 is used for fastening connection and sealing connection, the technical performances such as connection performance, locking performance, anti-loosening performance, bearing performance and sealing performance are realized through the screwing connection of the bidirectional tapered hole 41 and the bidirectional truncated cone body 71. The load is borne in one direction and/or respectively borne in two directions at the same time according to the application conditions, i.e., the bidirectional truncated cone body 71 and the bidirectional tapered hole 41 are guided by the helical line to align the inner diameter and the outer diameter of the internal cone and the external cone till the first helical conical surface 421 of the tapered hole is adhered with the second helical conical surface 722 of the truncated cone body to achieve interference contact and/or till the second helical conical surface 422 of the tapered hole is fitted with the first helical conical surface 721 of the truncated cone body to achieve interference contact, thereby realizing the technical performances of a mechanical fastening mechanism, such as the connection performance, the locking performance, the anti-loosening performance, the bearing performance and the sealing performance.

[0067] Therefore, the technical performances such as the transmission precision, the transmission efficiency, the load bearing capacity, the locking force of self-locking, the anti-loosening ability, the sealing performance and reusability of the mechanical fastening mechanism using the asymmetric bidirectional tapered thread connection pair 10 in the present embodiment are related to the sizes of the first helical conical surface 721 of the truncated cone body and the formed left taper 95, i.e., the corresponding first taper angle 1, the second helical conical surface 722 of the truncated cone body and the formed right taper 96, i.e., the corresponding second taper angle 2, the first helical conical surface 421 of the tapered hole and the formed left taper 95, i.e., the corresponding first taper angle 1, as well as the second helical conical surface 422 of the tapered hole and the formed right taper 96, i.e., the corresponding second taper angle 2.

[0068] In other words, the self-locking and self-positioning ability of cone fit cannot be achieved at any taper angle or any taper. Namely, the technical performances such as the locking performance, the anti-loosening performance, the bearing performance, the transmission performance and the sealing performance of the asymmetric bidirectional tapered thread connection pair 10 mainly depend on the first helical conical surfaces of the internal thread 6 and the external thread 9 of the asymmetric bidirectional tapered thread 1 and the formed left taper 95, i.e., the corresponding first taper angle 1, the second helical conical surfaces of the internal thread 6 and the external thread 9 and the formed right taper 96, i.e., the corresponding second taper angle 2. Material friction coefficient, processing quality and application conditions of the columnar body 3 and the cylindrical body 2 also have a certain impact on the technical performances.

[0069] In the asymmetric bidirectional tapered thread connection pair 10, when the right-angled trapezoid union rotates a circle at a constant speed, the axial movement distance of the right-angled trapezoid union is at least double the length of the sum of the right-angled sides of two right-angled trapezoids with the same lower bottom sides and upper sides and different right-angled sides. The structure ensures that the first helical conical surface 721 and the second helical conical surface 722 of the truncated cone body as well as the first helical conical surface 421 and the second helical conical surface 422 of the tapered hole have sufficient length, thereby ensuring that the conical surface 72 of the bidirectional truncated cone body and the conical surface 42 of the bidirectional tapered hole have sufficient effective contact area and strength and the efficiency required by helical movement during fitting.

[0070] In the asymmetric bidirectional tapered thread connection pair 10, when the right-angled trapezoid union rotates a circle at a constant speed, the axial movement distance of the right-angled trapezoid union is equal to the length of the sum of the right-angled sides of two right-angled trapezoids with the same lower bottom sides and upper sides and different right-angled sides. The structure ensures that the first helical conical surface 721 and the second helical conical surface 722 of the truncated cone body as well as the first helical conical surface 421 and the second helical conical surface 422 of the tapered hole have sufficient length, thereby ensuring that the conical surface 72 of the bidirectional truncated cone body and the conical surface 42 of the bidirectional tapered hole have sufficient effective contact area and strength and the efficiency required by helical movement during fitting.

[0071] In the asymmetric bidirectional tapered thread connection pair 10, the first helical conical surface 721 of the truncated cone body and the second helical conical surface 722 of the truncated cone body are both continuous helical surfaces or discontinuous helical surfaces; and the first helical conical surface 421 of the tapered hole and the second helical conical surface 422 of the tapered hole are both continuous helical surfaces or discontinuous helical surfaces. Preferably, the first helical conical surface 721 of the truncated cone body and the second helical conical surface 722 of the truncated cone body as well as the first helical conical surface 421 of the tapered hole and the second helical conical surface 422 of the tapered hole are all continuous helical surfaces.

[0072] In the asymmetric bidirectional tapered thread connection pair 10, when the cylindrical body 2 connecting hole is screwed into a screwing end of the columnar body 3, the screwing direction is regulated, i.e., the cylindrical body 2 connecting hole cannot be reversely screwed. The contact surfaces between the first helical conical surface 721 of the truncated cone body and the second helical conical surface 422 of the tapered hole serve as bearing surfaces and/or interference fit, and/or the contact surfaces between the second helical conical surface 722 of the truncated cone body and the first helical conical surface 421 of the tapered hole serve as bearing surfaces and/or interference fit, and/or the first helical conical surface 421 and the second helical conical surface 422 of the tapered hole are in containing cohesion contact with the first helical conical surface 721 and the second helical conical surface 722 of the truncated cone body. A connecting function of the asymmetric bidirectional tapered thread connection pair 10 is realized through the containing cohesion contact and/or interference fit between the conical surfaces of the internal thread 6 and the external thread 9.

[0073] In the asymmetric bidirectional tapered thread connection pair 10, a head with the size greater than an outer diameter of the columnar body 3 is arranged at one end of the columnar body 3, and/or a head with the size smaller than a minor diameter of the tapered external thread 9 of a screw body 31 of the columnar body 3 is arranged at one end and/or two ends of the columnar body 3. The connecting hole is a threaded hole formed in a nut body 21. Namely, the columnar body 3 connected with the head is a bolt; and the columnar body having no head and/or having heads at both ends smaller than the minor diameter of the bidirectional tapered external thread 9 and/or having no thread at the middle and having the bidirectional tapered external threads 9 at both ends is a stud. The connecting hole is formed in the nut body 21.

[0074] Compared with the prior art, the asymmetric bidirectional tapered thread connection pair 10 has the advantages of reasonable design, simple structure, convenient operation, large locking force, high bearing capacity, excellent anti-loosening performance, high transmission efficiency and precision, good mechanical sealing effect and good stability, realizes the fastening and connecting functions through sizing of the cone pair formed by the internal cone and the external cone to achieve interference fit, can prevent loosening phenomenon during connection, and has self-locking and self-positioning functions.

Embodiment 2

[0075] As shown in FIGS. 4, 5 and 6, the structures, principles and implementation steps in the present embodiment are similar to those in the embodiment 1. The differences are that, in the present embodiment, the external thread 9 forming the thread pair 10 is the asymmetric bidirectional tapered thread 1 in the dumbbell-like shape 94, i.e., the asymmetric bidirectional truncated cone body 71 in the dumbbell-like shape 94 and with the left taper 95 greater than the right taper 96; and the internal thread 6 is the asymmetric bidirectional tapered thread 1 in the olive-like shape 93, i.e., the asymmetric bidirectional tapered hole 41 in the olive-like shape 93 and with the left taper 95 smaller than the right taper 96.

[0076] The asymmetric bidirectional truncated cone body 71 in the dumbbell-like shape 94 is formed by symmetrically and oppositely jointing the upper top surfaces of two truncated cone bodies with the same lower bottom surfaces and upper top surfaces and different cone heights. Namely, when the upper top surfaces of two truncated cone bodies with the same lower bottom surfaces and upper top surfaces and different cone heights are jointed with each other, and the lower bottom surfaces are located at both ends of the bidirectional truncated cone body 71 to form the asymmetric bidirectional tapered thread 1, the process comprises that the upper top surfaces are respectively jointed with the lower bottom surfaces of the adjacent bidirectional truncated cone bodies 71 and/or to be respectively jointed with the lower bottom surfaces of the adjacent bidirectional truncated cone bodies 71. The outer surface of the truncated cone body 7 is provided with the conical surface 72 of the asymmetric bidirectional truncated cone body. The external thread 9 comprises the first helical conical surface 721 of the truncated cone body, the second helical conical surface 722 of the truncated cone body and the external helical line 8, which form the asymmetric bidirectional tapered external thread 9. In the cross section through which the thread axis passes through, the complete single-pitch asymmetric bidirectional tapered external thread 9 is a special bidirectional tapered geometry in the dumbbell-like shape 94 and with a small middle and two large ends. The angle formed between the two plain lines of the left conical surface of the asymmetric bidirectional truncated cone body 71, i.e., the first helical conical surface 721 of the truncated cone body, is the first taper angle 1, i.e., the left taper angle corresponding to the left taper 95 of the external thread 9 of the asymmetric bidirectional tapered thread. The left taper 95 is subjected to a right-direction distribution 98. The angle formed by the two plain lines of the right conical surface of the asymmetric bidirectional truncated cone body 71, i.e., the second helical conical surface 722 of the truncated cone body, is the second taper angle 2, i.e., the right taper angle corresponding to the right taper 96 of the external thread 9 of the asymmetric bidirectional tapered thread. The right taper 96 is subjected to a left-direction distribution 97. The taper directions corresponding to the first taper angle 1 and the second taper angle 2 are opposite. The plain line is an intersection line of the conical surface and the plane through which the cone axis passes through. The shape formed by the first helical conical surface 721 and the second helical conical surface 722 of the truncated cone body of the bidirectional truncated cone body 71 is the same as the shape of a helical outer flank of a rotating body, which circumferentially rotates at a constant speed by using a right-angled side of a right-angled trapezoid union as a rotating center and is formed by two hypotenuses of the right-angled trapezoid union when the right-angled trapezoid union axially moves at a constant speed along a central axis of the columnar body 3. The right-angled side is coincident with the central axis of the columnar body 3; and the right-angled trapezoid union is formed by symmetrically and oppositely jointing upper sides of two right-angled trapezoids with the same lower bottom sides and upper sides and different right-angled sides. The right-angled trapezoid union refers to a special geometry, which is formed by symmetrically and oppositely jointing the upper sides of two right-angled trapezoids with the same lower bottom sides and upper sides and different right-angled sides and has the lower bottom sides respectively located at both ends of the right-angled trapezoid union. The left taper 95 is formed by the first helical conical surface 721 of the truncated cone body and corresponds to the first taper angle 1 of the asymmetric bidirectional tapered external thread 9, i.e., the left taper 95 of the external thread 9 of the asymmetric bidirectional tapered thread corresponds to the left taper angle and is subjected to the right-direction distribution 98. The right taper 96 is formed by the second helical conical surface 722 of the truncated cone body and corresponds to the second taper angle 2 of the asymmetric bidirectional tapered external thread 9, i.e., the right taper 96 of the external thread 9 of the asymmetric bidirectional tapered thread corresponds to the right taper angle and is subjected to the left-direction distribution 97. The taper directions corresponding to the first taper angle 1 and the second taper angle 2 are opposite.

[0077] The asymmetric bidirectional tapered hole 41 in the olive-like shape 93 is formed by symmetrically and oppositely jointing lower bottom surfaces of two tapered holes with the same lower bottom surfaces and upper top surfaces and different cone heights. Namely, when the lower bottom surfaces of two tapered holes with the same lower bottom surfaces and upper top surfaces and different cone heights are jointed with each other, and the upper top surfaces are located at both ends of the bidirectional tapered hole 41 to form the asymmetric bidirectional tapered thread 1, the process comprises that the lower bottom surfaces are respectively jointed with the upper top surfaces of the adjacent bidirectional tapered holes 41 and/or to be respectively jointed with the upper top surfaces of the adjacent bidirectional tapered holes 41. The tapered hole 4 comprises the conical surface 42 of the asymmetric bidirectional tapered hole. The internal thread 6 comprises a first helical conical surface 421 of the tapered hole, a second helical conical surface 422 of the tapered hole and an internal helical line 5, which form an asymmetric bidirectional tapered internal thread 6. In the cross section through which the thread axis passes through, the complete single-pitch asymmetric bidirectional tapered internal thread 6 is a special bidirectional tapered geometry in the olive-like shape 93 and with a large middle and two small ends. The angle formed by the two plain lines of the left conical surface of the bidirectional tapered hole 41, i.e., the first helical conical surface 421 of the tapered hole, is the first taper angle 1, i.e., the left taper angle corresponding to the left taper 95 of the internal thread 6 of the asymmetric bidirectional tapered thread. The left taper 95 is subjected to the left-direction distribution 97. The angle formed by the two plain lines of the right conical surface of the bidirectional tapered hole 41, i.e., the second helical conical surface 422 of the tapered hole, is the second taper angle 2, i.e., the right taper angle corresponding to the right taper 96 of the internal thread 6 of the asymmetric bidirectional tapered thread. The right taper 96 is subjected to the right-direction distribution 98. The taper directions corresponding to the first taper angle 1 and the second taper angle 2 are opposite. The plain line is an intersection line of the conical surface and the plane through which the cone axis passes through. The shape formed by the first helical conical surface 421 and the second helical conical surface 422 of the tapered hole of the bidirectional tapered hole 41 is the same as the shape of a helical outer flank of a rotating body, which circumferentially rotates at a constant speed by using a right-angled side of a right-angled trapezoid union as a rotating center and is formed by two hypotenuses of the right-angled trapezoid union when the right-angled trapezoid union axially moves at a constant speed along a central axis of the cylindrical body 2. The right-angled side is coincident with the central axis of the cylindrical body 2; and the right-angled trapezoid union is formed by symmetrically and oppositely jointing lower bottom sides of two right-angled trapezoids with the same lower bottom sides and upper sides and different right-angled sides. The right-angled trapezoid union refers to a special geometry, which is formed by symmetrically and oppositely jointing the lower bottom sides of two right-angled trapezoids with the same lower bottom sides and upper sides and different right-angled sides and has the upper sides respectively located at both ends of the right-angled trapezoid union. The left taper 95 is formed by the first helical conical surface 421 of the tapered hole and corresponds to the first taper angle 1 of the asymmetric bidirectional tapered internal thread 6, i.e., the left taper 95 of the internal thread 6 of the asymmetric bidirectional tapered thread corresponds to the left taper angle and is subjected to the left-direction distribution 97. The right taper 96 is formed by the second helical conical surface 422 of the tapered hole and corresponds to the second taper angle 2 of the asymmetric bidirectional tapered internal thread 6, i.e., the right taper 96 of the internal thread 6 of the asymmetric bidirectional tapered thread corresponds to the right taper angle and is subjected to the right-direction distribution 98. The taper directions corresponding to the first taper angle 1 and the second taper angle 2 are opposite.

[0078] The specific embodiments described herein are merely examples to illustrate the spirit of the present disclosure. Those skilled in the art of the present disclosure can make various modifications or supplements to the specific embodiments described or substitute with similar modes without deviating from the spirit of the present disclosure or going beyond the scope defined by the appended claims.

[0079] The terms such as tapered thread 1, cylindrical body 2, nut body 21, columnar body 3, screw body 31, tapered hole 4, bidirectional tapered hole 41, helical conical surface 42 of the bidirectional tapered hole, first helical conical surface 421 of the tapered hole, first taper angle 1, second helical conical surface 422 of the tapered hole, second taper angle 2, internal helical line 5, internal thread 6, truncated cone body 7, bidirectional truncated cone body 71, conical surface 72 of the bidirectional truncated cone body, first helical conical surface 721 of the truncated cone body, first taper angle 1, second helical conical surface 722 of the truncated cone body, second taper angle 2, external helical line 8, external thread 9, olive-like shape 93, dumbbell-like shape 94, left taper 95, right taper 96, left-direction distribution 97, right-direction distribution 98, thread connection pair and/or thread pair 10, clearance 101, self-locking force, self-locking, self-positioning, pressure, cone axis 01, thread axis 02, mirror image, shaft sleeve, shaft, non-entity space, material entity, single tapered body, double tapered body, cone body, internal cone body, tapered hole, external cone body, tapered body, cone pair, helical structure, helical movement, thread body, complete unit thread, axial force, axial force angle, counter-axial force, counter-axial force angle, centripetal force, counter-centripetal force, reversely collinear, internal stress, bidirectional force, unidirectional force, sliding bearing and sliding bearing pair are widely used, but the possibility of using other terms is not excluded. These terms are merely used to describe and explain the essence of the present disclosure more conveniently; and it is contrary to the spirit of the present disclosure to interpret the terms as any additional limitation.