OLIVE-SHAPED ASYMMETRIC BIDIRECTIONAL TAPERED THREAD CONNECTION PAIR WITH SMALLER LEFT TAPER AND GREATER RIGHT TAPER

Abstract

The present invention belongs to the field of general technology of device, and relates to an olive-shaped asymmetric bidirectional tapered thread connection pair with smaller left taper and greater right taper, which solves the problems of poor self-positioning and self-locking performance of existing threads, wherein an internal thread (6) is a bidirectional tapered hole (41) (non-entity space) on 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 helical special bidirectional tapered body in an olive-like shape (93) with a left taper (95) smaller than a right taper (96) and with a large middle and two small ends.

Claims

1. An olive-shaped asymmetric bidirectional tapered thread connection pair with smaller left taper and greater right taper, i.e., an olive-like shaped (left taper is smaller than right taper) asymmetric bidirectional tapered thread, comprising: an external thread (9) and an internal thread (6) in thread fit, wherein a complete unit thread of the olive-like (left taper is smaller than right taper) asymmetric bidirectional tapered thread (1) is a helical asymmetric bidirectional tapered body in an olive-like shape (93) and with a left taper (95) smaller than a right taper (96) and with a large middle and two small ends, comprising a bidirectional tapered hole (41) and/or a bidirectional truncated cone body (71); a thread body of the internal thread (6) is a helical bidirectional tapered hole (41) on an inner surface of a cylindrical body (2) and exists in the form of non-entity space; a thread body of the external thread (9) is a helical bidirectional truncated cone body (71) on an outer surface of a columnar body (3) and exists in the form of material entity; the left taper (95) formed on a left tapered surface of the asymmetric bidirectional tapered body corresponds to a first taper angle (1); the right taper (96) formed on a right tapered surface corresponds to a second taper angle (2); the left taper (95) and the right taper (96) have opposite directions and different tapers; the internal thread (6) and the external thread (9) contain the cone body through tapered holes till inner and outer tapered surfaces bear each other; technical performances mainly depend on the size of conical surfaces and tapers of thread bodies fitted with each other; preferably, 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; and in individual special fields, preferably, the second taper angle (2) is greater than or equal to 53 and smaller than 180.

2. The thread connection pair according to claim 1, wherein the bidirectional tapered internal thread (6) in the olive-like shape (93) comprises a left conical surface of a conical surface (42) of the bidirectional tapered hole, i.e., a first helical conical surface (421) of the tapered hole, a right conical surface, i.e., a second helical conical surface (422) of the tapered hole, and an internal helical line (5); the shape formed by the first helical conical surface (421) of the tapered hole and the second helical conical surface (422) of the tapered hole, i.e., the bidirectional helical conical surfaces, is the same as the shape of a helical outer flank of a rotating body, which circumferentially rotates at a constant speed by using a right-angled side of a right-angled trapezoid union as a rotating center and is formed by two hypotenuses of the right-angled trapezoid union when the right-angled trapezoid union axially moves at a constant speed along a central axis of the cylindrical body (2), wherein the right-angled side is coincident with the central axis of the cylindrical body (3); 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 bottom sides and different right-angled sides; the bidirectional tapered external thread (9) in the olive-like shape (93) comprises a left conical surface of a conical surface (72) of the bidirectional truncated cone body, i.e., a first helical conical surface (721) of the truncated cone body, a right conical surface, i.e., a second helical conical surface (722) of the truncated cone body, and an external helical line (8); the 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, i.e., the bidirectional helical conical surfaces, is the same as the shape of a helical outer flank of a rotating body, which circumferentially rotates at a constant speed by using a right-angled side of a right-angled trapezoid union as a rotating center and is formed by two hypotenuses of the right-angled trapezoid union when the right-angled trapezoid union axially moves at a constant speed along a central axis of the columnar body (3), wherein the right-angled side is coincident with the central axis of the columnar body (3); 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 bottom sides and different right-angled sides.

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 the length of the sum of the right-angled sides of 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 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 1, wherein the left conical surface and the right conical surface of the bidirectional tapered body, 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 internal helical line (5) are continuous helical surfaces or discontinuous helical surfaces; and/or the first helical conical surface (721) of the truncated cone body and the second helical conical surface (722) of the truncated cone body and the external helical line (8) are continuous helical surfaces or discontinuous helical surfaces.

6. The thread connection pair according to claim 1, wherein the internal thread (6) is formed by symmetrically and oppositely jointing the lower bottom surfaces of two tapered holes (4) with the same lower bottom surfaces and upper top surfaces and different cone heights, and the upper top surfaces are located at both ends of the bidirectional tapered hole (41) to form the asymmetric bidirectional tapered thread (1) in the olive-like shape (93), comprising that the upper top surfaces are respectively jointed with the upper top surfaces of the adjacent bidirectional tapered holes (41) and/or will be respectively jointed with the upper top surfaces of the adjacent bidirectional tapered holes (41) to form a helical shape to form the asymmetric bidirectional tapered internal thread (6) in the olive-like shape (93); the external thread (9) is formed by symmetrically and oppositely jointing the lower bottom surfaces of two truncated cone bodies (7) with the same lower bottom surfaces and upper top surfaces and different cone heights, 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) in the olive-like shape (93), comprising that the upper top surfaces are respectively jointed with the upper top surfaces of the adjacent bidirectional truncated cone bodies (71) and/or will be respectively jointed with the upper top surfaces of the adjacent bidirectional truncated cone bodies (71) to form a helical shape to form the asymmetric bidirectional tapered external thread (9) in the olive-like shape (93).

7. The thread connection pair according to claim 1, wherein a large diameter of the external thread (9) is of an external sharp angle shape structure; a small diameter of the external thread (9) is of an internal sharp angle shape structure; a large diameter of the internal thread (6) is of an internal sharp angle shape structure; a small diameter of the internal thread (6) is of an external sharp angle shape structure; and/or the small diameter of the external thread (9) is treated with a groove (91) structure, and the large diameter of the internal thread (6) is treated with a groove (61) structure; the large diameter of the external thread (9) and the small diameter of the internal thread (6) are kept as a sharp angle structure, and/or the large diameter of the external thread (9) is treated with a planar or arc (92) structure, and the small diameter of the internal thread (6) is treated with a planar or arc (62) structure; the small diameter of the external thread (9) and the large diameter of the internal thread (6) are kept as a sharp angle structure, and/or the small diameter of the external thread (9) is treated with a groove (91) structure, and the large diameter of the internal thread (6) is treated with a groove (61) structure; and/or the small diameter of the external thread (9) is treated with a groove (91) structure, and the large diameter of the internal thread (6) is treated with a groove (61) structure; and the large diameter of the external thread (9) is treated with a planar or arc (92) structure, and the small diameter of the internal thread (6) is treated with a planar or arc (62) structure.

8. The thread connection pair according to claim 1, wherein the thread pair (10) composed of the internal thread (6) and the external thread (9) is formed as follows: the helical bidirectional tapered hole (41) and the helical bidirectional truncated cone body (71) are guided by the helical line to achieve mutual sizing interference so as to form cone pairs in pitches; a clearance (101) is reserved between the bidirectional truncated cone body (71) and the bidirectional tapered hole (41); the internal thread (6) of each pitch contains the external thread (9) of a corresponding pitch to achieve coaxial centered sizing so as to form a set of sliding bearings; the whole thread connection pair (10) is composed of one or several sets of sliding bearings; the number of the effective bidirectional jointed, i.e., the effective bidirectional contact cohered, containing and contained thread pitches of the internal thread (6) and the external thread (9) is designed according to the application conditions; multidirectional positioning is formed through bidirectional containment of the truncated cone body (7) of the external thread (9) by the tapered hole (4) of the internal thread (6) and exists in multiple directions such as radial, circumferential, axial and angular directions; and each pitch of the internal thread (6) and the external thread (9) comprises bidirectional bearing on one side and/or bidirectional bearing on the left and right sides.

9. The thread connection pair according to claim 1, wherein self-locking of the thread pair (10) composed of the internal thread (6) and the external thread (9) is produced as follows: the first helical conical surface (421) of the tapered hole and the second helical conical surface (422) of the tapered hole matched with the first helical conical surface (721) of the truncated cone body and the second helical conical surface (722) of the truncated cone body 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 till the conical surface (72) of the bidirectional truncated cone body is cohered with the special conical surface (42) to achieve one-directional bearing of the helical conical surface and/or bidirectional simultaneous bearing of the helical conical surface and/or till the sizing fit and self-positioning contact and/or till the sizing interference contact.

10. 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 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 bidirectional tapered internal threads (6) on the inner surfaces; and the outer surfaces and/or inner surfaces comprise cylindrical surfaces, non-cylindrical surfaces such as conical surfaces, and other surface geometrical shapes.

11. The thread connection pair according to claim 1, wherein the internal thread (6) and/or the external thread (9) comprise single-pitch thread bodies that are incomplete tapered geometries, i.e., the single-pitch thread bodies are incomplete unit threads.

Description

DESCRIPTION OF THE DRAWINGS

[0041] FIG. 1 is a structural schematic diagram of an olive-like shaped (a left taper is smaller than a right taper) asymmetric bidirectional tapered thread connection pair according to an embodiment 1 of the present invention;

[0042] FIG. 2 is a structural schematic diagram of an external thread of the olive-like shaped (the left taper is smaller than the right taper) asymmetric bidirectional tapered thread and a complete unit thread of the external thread according to the embodiment 1 of the present invention;

[0043] FIG. 3 is a structural schematic diagram of an internal thread of an olive-like shaped (the left taper is smaller than the right taper) asymmetric bidirectional tapered thread and a complete unit thread of the internal thread according to the embodiment 1 of the present invention;

[0044] FIG. 4 is a structural schematic diagram of an olive-like shaped (the left taper is smaller than the right taper) asymmetric bidirectional tapered thread connection pair according to an embodiment 2 of the present invention;

[0045] FIG. 5 is a structural schematic diagram of an olive-like shaped (the left taper is smaller than the right taper) asymmetric bidirectional tapered thread connection pair according to the embodiment 3 of the present invention;

[0046] FIG. 6 is a structural schematic diagram of an olive-like shaped (the left taper is smaller than the right taper) asymmetric bidirectional tapered thread according to the embodiment 4 of the present invention;

[0047] FIG. 7 is a structural schematic diagram of an olive-like shaped (the left taper is smaller than the right taper) asymmetric bidirectional tapered thread according to the embodiment 5 of the present invention;

[0048] FIG. 8 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 invention;

[0049] FIG. 9 is a graphic presentation of an inclined plane slider model of the principle of the existing thread technology-the principle of inclined plane involved in the background of the present invention; and

[0050] FIG. 10 is a graphic presentation of a thread rise angle of the existing thread technology involved in the background of the present invention.

[0051] 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 bidirectional tapered hole, first helical conical surface 421 of tapered hole, first taper angle 1, second helical conical surface 422 of tapered hole, second taper angle 2, internal 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, 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, bidirectional tapered external thread groove 91, bidirectional tapered external thread plane or arc 92, olive-like shape 93, left taper 95, right taper 96, left-direction distribution 97, right-direction distribution 98, thread connection pair and/or thread pair 10, clearance 101, 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

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

Embodiment 1

[0053] As shown in FIGS. 1, 2 and 3, an olive-like shaped asymmetric bidirectional tapered thread connection pair 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 helical tapered hole 41 and exists in the form of non-entity space; and the external thread 9 is a distributed as a helical bidirectional truncated cone body 71 and exists in the form of material entity. The internal thread 6 and the external thread 9 are subjected to a relationship of containing part and contained part. The internal thread 6 and the external thread 9 are sleeved together by screwing pitch by pitch in bidirectional tapered geometry and cohered till interference fit is achieved, i.e., the bidirectional tapered hole 41 contains the bidirectional truncated cone body 71 pitch by pitch. The bidirectional containment limits 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.

[0054] When the olive-like shaped asymmetric bidirectional tapered thread connection pair is used in the present embodiment, a conical surface 72 of the bidirectional truncated cone body is fitted with a conical surface 42 of the bidirectional tapered hole.

[0055] The asymmetric bidirectional tapered thread connection pair 10 in the present embodiment has the self-locking and self-positioning performances only when the truncated cone body 7 and/or the tapered hole 4 of the olive-like shaped asymmetric bidirectional tapered thread connection pair reaches a certain taper, i.e., the 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. The asymmetric bidirectional tapered thread 1 has the left taper 95 smaller than the right taper 96. The left taper 95 corresponds to the left taper angle, i.e., a first taper angle 1. Preferably, the first taper angle 1 is greater than 0 and smaller than 53; and preferably, the first taper angle 1 is 2-40. The right taper 96 corresponds to the right taper angle, i.e., a second taper angle 2. Preferably, 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, that is, in connection application fields in which the self-locking performance is not needed and/or the self-positioning requirement is low and/or an axial bearing force requirement is high, preferably, 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.

[0056] The external thread 9 is arranged on the outer surface of the columnar body 3, wherein the columnar body 3 is provided with a screw body 31; the truncated cone body 7 is helically distributed on the outer surface of the screw body 31; and the truncated cone body 7 comprises the asymmetric bidirectional truncated cone body 71. The asymmetric bidirectional truncated cone body 71 is a special bidirectional tapered geometry in the olive shape 93. The columnar body 3 may be solid or hollow, comprising cylinders, cones, tubes and the like.

[0057] 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 and taper of the left truncated cone body smaller than taper of the right truncated cone body. The upper top surfaces are located at both ends of the bidirectional truncated cone body 71 to form the asymmetric bidirectional tapered thread 1 in the olive-like shape 93, 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 will be respectively jointed with the upper top surfaces of the adjacent bidirectional truncated cone bodies 71. The outer surface of the truncated cone body 71 is provided with a 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. In the cross section through which the thread axis 02 passes, the 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 and with the taper of the left truncated cone body smaller than the taper of the right truncated cone body. The angle formed between two plain lines of the left conical surface of the bidirectional truncated cone body 71, i.e., the first helical conical surface 721 of the truncated cone body, is the first taper angle 1. The left taper 95 formed on the first helical conical surface 721 of the truncated cone body corresponds to the first taper angle 1 and 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. The right taper 96 formed on the second helical conical surface 722 of the truncated cone body corresponds to the second taper angle 2 and 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 01. The shape formed by the first helical conical surface 721 and the second helical conical surface 722 of the truncated cone body of the bidirectional truncated cone body 71 is the same as the shape of a helical outer flank of a rotating body, which circumferentially rotates at a constant speed by using a right-angled side of a right-angled trapezoid union as a rotating center and is formed by two hypotenuses of the right-angled trapezoid union when the right-angled trapezoid union axially moves at a constant speed along a central axis of the columnar body 3, wherein the right-angled side is coincident with the central axis of the columnar body 3; 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 bottom 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 bottom sides and different right-angled sides and has the upper bottom sides respectively located at both ends of the right-angled trapezoid union.

[0058] 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. Helically distributed tapered holes 4 are formed in the inner surface of the nut body 21. The tapered holes 4 comprise asymmetric bidirectional tapered holes 41. The asymmetric bidirectional tapered hole 41 is a special bidirectional tapered geometry in the olive shape 93. The cylindrical body 2 comprises cylindrical and/or non-cylindrical workpieces and objects that need to be machined with the internal threads on the inner surfaces.

[0059] 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 and taper of the left tapered hole smaller than taper of the right tapered hole. The upper top surfaces are located at both ends of the bidirectional tapered hole 41 to form the asymmetric bidirectional tapered thread 1 in the olive-like shape 93, the process comprises that the upper top surfaces are respectively jointed with the upper top surfaces of the adjacent bidirectional tapered holes 41 and/or will be respectively jointed with the upper top surfaces of the adjacent bidirectional tapered holes 41 to form the thread. 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. In the cross section through which the thread axis 02 passes, 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 and left taper smaller than right taper. The angle formed between 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. The left taper 95 formed on the first helical conical surface 421 of the tapered hole corresponds to the first taper angle 1 and is subjected to a left-direction distribution 97. The angle formed between 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. The right taper 96 formed on the second helical conical surface 422 of the tapered hole corresponds to the second taper angle 2 and 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 01. The shape formed by the first helical conical surface 421 and the second helical conical surface 422 of the tapered hole of the bidirectional tapered hole 41 is the same as the shape of a helical outer flank of a rotating body, which circumferentially rotates at a constant speed by using a right-angled side of a right-angled trapezoid union as a rotating center and is formed by two hypotenuses of the right-angled trapezoid union when the right-angled trapezoid union axially moves at a constant speed along a central axis of the cylindrical body 2, wherein the right-angled side is coincident with the central axis of the columnar body; 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 bottom 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 bottom sides and different right-angled sides and has the upper bottom sides respectively located at both ends of the right-angled trapezoid union.

[0060] In the olive-like shaped asymmetric bidirectional tapered thread connection pair in the present embodiment, the joints of the adjacent helical conical surfaces of the external thread 9 and the joints of the adjacent helical conical surfaces of the internal thread 6 adopt a sharp angle connected form; and relative to the non-sharp angle, the sharp angle refers to a structural form that is not specially subjected to non-sharp angle treatment.

[0061] In the bidirectional truncated cone body 71 and the bidirectional tapered hole 41 in the olive-like shape 93, the joints between the first helical conical surface 721 of the truncated cone body of the bidirectional truncated cone body 71 and the second helical conical surface 722 of the truncated cone body in the same helix, i.e., large diameters of the external thread 9, are connected by an external sharp angle structure, and an external helical line 8 distributed helically is formed. The joints between the first helical conical surface 721 of the truncated cone body of the bidirectional truncated cone body 71 and the second helical conical surface 722 of a truncated cone body adjacent to the bidirectional truncated cone body 71 in the same helix, and/or the joints between the second helical conical surface 722 of the truncated cone body of the bidirectional truncated cone body 71 and the first helical conical surface 721 of a truncated cone body adjacent to the bidirectional truncated cone body 71 in the same helix, i.e., small diameters of the external thread 9, are connected by an internal sharp angle shape structure, and an external helical line 8 distributed helically is formed. The joints between the first helical conical surface 421 of the tapered hole of the bidirectional tapered hole 41 and the second helical conical surface 422 of the tapered hole in the same helix, i.e., large diameters of the internal thread 6, are connected by an internal sharp angle shape structure, and an internal helical line 5 distributed helically is formed. The joints between the first helical conical surface 421 of the tapered hole of the bidirectional tapered hole 41 and the second helical conical surface 422 of the tapered hole of the adjacent bidirectional tapered hole 41 and/or the joints between the second helical conical surface 422 of the tapered hole of the bidirectional tapered hole 41 and the first helical conical surface 421 of the tapered hole of the adjacent bidirectional tapered hole 41 in the same helix, i.e., small diameters of the internal thread 6, are connected by an external sharp angle shape structure, and an internal helical line 5 distributed helically is formed. The more compact the thread structure is, the higher the strength is, and the higher the force bearing value is. Excellent mechanical connection, locking and sealing performances are achieved; and physical machining spaces of the tapered threads are wider

[0062] In the olive-like shaped asymmetric bidirectional tapered thread connection pair in the present embodiment, during transmission connection, by virtue of screwed connection between the bidirectional tapered hole 41 and the bidirectional truncated cone body 71 and bidirectional bearing, 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., a 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 the bidirectional tapered internal thread 6 bidirectionally contains a corresponding pitch of bidirectional tapered external thread 9 to form a pair 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. The multidirectional positioning in multiple directions such as radial, axial, angular and circumferential directions, preferably through the containment of the bidirectional external cone 9 by the bidirectional internal cone 6 constitutes a special synthesis technology of the special cone pair and the thread pair to ensure the precision, efficiency and reliability of the tapered thread technology, particularly the transmission connection of the olive-like shaped asymmetric bidirectional tapered thread connection pair 10.

[0063] When the olive-like shaped asymmetric bidirectional tapered thread connection pair in the present embodiment is used for fastening connection and sealing connection, the technical performances such as connection, locking, anti-loosening, bearing, fatigue and seal are realized through the screwing connection of the bidirectional tapered hole 41 and the bidirectional truncated cone body 71, i.e., are realized through the sizing of the first helical conical surface 721 of the truncated cone body and the first helical conical surface 421 of the tapered hole till interference and/or the sizing of the second helical conical surface 722 of the truncated cone body and the second helical conical surface 422 of the tapered hole till interference. 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 first helical conical surface 721 of the truncated cone body till the interference contact is achieved, and/or the second helical conical surface 422 of the tapered hole is cohered with the second helical conical surface 722 of the truncated cone body till the sizing interference contact is achieved, so as to realize the technical performances of a mechanical mechanism, such as connection performance, locking performance, anti-loosening performance, bearing performance, fatigue performance and sealing performance.

[0064] Therefore, the technical performances such as the transmission precision and efficiency, the load bearing capacity, the locking force of self-locking, the anti-loosening ability and the sealing performance of the mechanical mechanism using the olive-like shaped asymmetric bidirectional tapered thread connection pair 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 first taper angle 1, the second helical conical surface 722 of the truncated cone body and the formed right taper 96, i.e., the second taper angle 2, and the sizes of the first helical conical surface 421 of the tapered hole and the formed left taper 95, i.e., the first taper angle 1, and the second helical conical surface 422 of the tapered hole and the formed right taper 96. 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.

[0065] In the olive-like shaped asymmetric bidirectional tapered 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 the length of the sum of the right-angled sides of two right-angled trapezoids with the same lower bottom sides and upper bottom 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 and 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.

[0066] In the olive-like shaped asymmetric bidirectional tapered 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 the length of the sum of the right-angled sides of two right-angled trapezoids with the same lower bottom sides and upper bottom sides and different right-angled sides. The structure ensures that the first helical conical surface 721 of the truncated cone body and the second helical conical surface 722 of the truncated cone body and the first helical conical surface 421 and the second helical conical surface 422 of the tapered hole have sufficient length, thereby ensuring that the conical surface 72 of the bidirectional truncated cone body and the conical surface 42 of the bidirectional tapered hole have sufficient effective contact area and strength and the efficiency required by helical movement during fitting.

[0067] In the olive-like shaped asymmetric bidirectional tapered thread connection pair, 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. It is preferable that, the first helical conical surface 721 of the truncated cone body and the second helical conical surface 722 of the truncated cone body and the 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

[0068] In the olive-like shaped asymmetric bidirectional tapered thread connection pair, when the connecting hole of the cylindrical body 2 is screwed into the screw-in end of the columnar body 3, the screw-in direction is required, i.e., the connecting hole of the cylindrical body 2 cannot be reversely screwed in.

[0069] In the olive-like shaped asymmetric bidirectional tapered thread connection pair, 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 bidirectional 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, wherein the connecting hole is a threaded hole formed in a nut 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, wherein the connecting hole is formed in the nut 21.

[0070] Compared with the prior art, the olive-like shaped asymmetric bidirectional tapered thread connection pair 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 bidirectional bearing or sizing of the cone pair formed by coaxially aligning the inner diameter and the outer diameter of 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

[0071] As shown in FIG. 4, the structures, principles and implementation steps in the present embodiment are similar to those in the embodiment 1. The differences are that, the small diameters of the external thread 9, i.e., the joints of the adjacent helical conical surfaces, are treated with the external helical structure connected by grooves 91; the external helical structure is a special external helical line 8; the large diameters of the internal threads 6 are treated with the internal thread structure connected by grooves 61; and the internal helical structure is a special internal helical line 5. Thus, interference between the internal thread 6 and the external thread 9 during screwing may be avoided, and oil or dirt may be stored.

Embodiment 3

[0072] As shown in FIG. 5, the structures, principles and implementation steps in the present embodiment are similar to those in the embodiment 1. The differences are that, the large diameters of the external thread 9 are treated with an external helical structure connected by planes or arcs 92; the external helical structure is a special external helical line 8; the small diameters of the internal thread 6, i.e., the joints of the adjacent helical conical surfaces are treated with an internal helical structure connected by planes or arcs 62; and the internal helical structure is a special internal helical line 5. Thus, interference between the internal thread 6 and the external thread 9 during screwing may be avoided, and oil or dirt may be stored.

Embodiment 4

[0073] As shown in FIG. 6, the structures, principles and implementation steps in the present embodiment are similar to those in the embodiment 1. The differences are that, the small diameters of the external thread 9, i.e., the joints of the adjacent helical conical surfaces, are treated with an external helical structure connected by grooves 91; the large diameters of the external thread 9 are treated with an external helical structure connected by planes or arcs 92; the external helical structure is a special external helical line 8; the large and small diameters of the internal thread forming the thread pair 10 with the external thread are connected by sharp angles. A possible angle R of the formed thread pair 10 may be avoided. Thus, interference between the internal thread 6 and the external thread 9 during screwing may be avoided, and oil or dirt may be stored.

Embodiment 5

[0074] As shown in FIG. 7, the structures, principles and implementation steps in the present embodiment are similar to those in the embodiment 1. The differences are that, the large diameters of the internal thread 6 are treated with an internal helical structure connected by grooves 61; the small diameters of the internal thread 6, i.e., the joints of the adjacent helical conical surfaces, are treated with an internal helical structure connected by planes or arcs 62; the internal helical structure is a special internal helical line 5; the large and small diameters of the external thread 9 forming the thread pair 10 with the internal thread are connected by sharp angles. A possible angle R of the formed thread pair 10 may be avoided. Thus, interference between the internal thread 6 and the external thread 9 during screwing may be avoided, and oil or dirt may be stored.

[0075] The specific embodiments described herein are merely examples to illustrate the spirit of the present invention. Those skilled in the art of the present invention can make various modifications or supplements to the specific embodiments described or substitute with similar modes without deviating from the spirit of the present invention or going beyond the scope defined by the appended claims.

[0076] 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, conical surface 42 of bidirectional tapered hole, first helical conical surface 421 of tapered hole, first taper angle 1, second helical conical surface 422 of tapered hole, second taper angle 2, internal 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, 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, bidirectional tapered external thread groove 91, bidirectional tapered external thread plane or arc 92, olive-like shape 93, left taper 95, right taper 96, left-direction distribution 97, right-direction distribution 98, thread connection pair and/or thread pair 10, clearance 101, 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, taper 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, sliding bearing pair, and the like 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 invention more conveniently; and it is contrary to the spirit of the present invention to interpret the terms as any additional limitation.