BOLT AND NUT CONNECTION STRUCTURE OF OLIVE-SHAPE BIDIRECTIONAL TAPERED THREAD WITH SMALLER LEFT TAPER AND GREATER RIGHT TAPER

Abstract

The present invention belongs to the technical field of device access, and relates to a bolt and nut connection structure of an olive-shape bidirectional tapered thread 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 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. A bolt and nut connection structure of an olive-shape bidirectional tapered thread with smaller left taper and greater right taper, i.e., a bolt and nut connection structure of an olive-like (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 until 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 connection structure 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 connection structure 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 connection structure 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 connection structure 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 connection structure 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 connection structure 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 until 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 until the sizing fit and self-positioning contact and/or until the sizing interference contact.

8. The connection structure according to claim 1, wherein the bolt and double-nut connection structure is adopted, the double nuts are respectively located on the left and right sides of a fastened workpiece and/or the bolt and single-nut connection structure is adopted, comprising a single nut (21) located on the right side or left side of the fastened workpiece and/or the bolt and double-nut connection structure is adopted, and the double nuts are located on a single side of the fastened workpiece; moreover, when one nut has been effectively combined with the bolt together, i.e., the internal thread (6) and the external thread (9) forming the tapered thread connection pair (10) are effectively cohered together, another nut may be removed and/or remained; the removed nut serves as an installation process nut; and the internal threads comprise bidirectional tapered threads (1), unidirectional tapered threads and traditional threads that may be in accordance with the technical spirit of the present invention due to mutual thread fit with the bidirectional tapered external thread (9), such as triangular threads, trapezoidal threads, sawtooth threads, rectangular threads and arc threads.

9. The connection structure according to claim 1, wherein when a 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; the connecting hole is a threaded hole formed in a nut (21) and a nut (22); the connecting hole is formed in the nut (21) and the nut (22); and the nuts refer to objects having a thread structure including nuts on the inner surface of the cylindrical body (2).

10. The connection structure according to claim 1, wherein the internal thread (6) and/or the external thread (9) 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

[0042] FIG. 1 is a structural schematic diagram of a connection structure of a bolt and double nuts of an olive-like (a left taper is smaller than a right taper) asymmetric bidirectional tapered thread according to an embodiment 1 of the present invention;

[0043] FIG. 2 is a structural schematic diagram of a bolt of an external thread of the olive-like (the left taper is smaller than the right taper) bidirectional tapered thread and a complete unit thread of the external thread according to the embodiment 1 of the present invention;

[0044] FIG. 3 is a structural schematic diagram of a nut body of an internal thread of an olive-like (the left taper is smaller than the right taper) bidirectional tapered thread and a complete unit thread of the internal thread according to the embodiment 1 of the present invention;

[0045] FIG. 4 is a structural schematic diagram of a connection structure of bolts and a single nut of an olive-like (the left taper is smaller than the right taper) asymmetric bidirectional tapered thread according to an embodiment 2 of the present invention;

[0046] FIG. 5 is a structural schematic diagram of a connection structure of bolts and double nuts of an olive-like (the left taper is smaller than the right taper) asymmetric bidirectional tapered thread according to the embodiment 3 of the present invention;

[0047] FIG. 6 is a structural schematic diagram of a connection structure of bolts and double nuts of an olive-like (the left taper is smaller than the right taper) asymmetric bidirectional tapered thread (with a gasket between the double nuts) according to the embodiment 4 of the present invention;

[0048] 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 invention;

[0049] 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 invention; and

[0050] FIG. 9 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, nut body 22, 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, 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, left taper 95, right taper 96, left-direction distribution 97, right-direction distribution 98, thread connection pair and/or thread pair 10, clearance 101, locking bearing surface 111, locking bearing surface 112, tapered thread bearing surface 122, tapered thread bearing surface 121, workpiece 130, nut body locking direction 131, gasket 132, cone axis 01, thread axis 02, slider A on 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, a connection structure of a bolt and double nuts is adopted in the present embodiment. The connection structure includes 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 until 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 tapered thread connection pair 10 of the bidirectional tapered thread and the nut to obtain the necessary ordered degree of freedom, thereby effectively synthesizing the technical characteristics of the cone pair and the thread pair.

[0054] The tapered thread connection pair 10 of the bolt and nut of the bidirectional tapered thread in the present embodiment has the self-locking and self-positioning performances only if the truncated cone body 7 and/or the tapered hole 4 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. In the present embodiment, 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.

[0055] 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, including cylinders, cones, tubes and other workpieces and objects on outer surfaces of which external threads need to be processed.

[0056] 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. 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 includes 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 includes 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, 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 and with the taper of the left truncated cone body smaller than the taper of the right truncated cone body. The asymmetric bidirectional truncated cone body 71 includes a conical surface 72 of the bidirectional 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 is formed on the first helical conical surface 721 of the truncated cone body 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 is formed on the second helical conical surface 722 of the truncated cone body 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.

[0057] The internal thread 6 is arranged on the inner surface of the cylindrical body 2. The cylindrical body 2 comprises a nut body 21 and a nut body 22. Helically distributed tapered holes 4 are formed in inner surfaces of the nut body 21 and the nut body 22. 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 includes cylindrical and/or non-cylindrical workpieces and objects that need to be machined with the internal threads on the inner surfaces.

[0058] 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. 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 includes 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 includes 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, a 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 including the conical surface 42 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 is formed on the first helical conical surface 421 of the tapered hole and is subjected to a left-direction distribution 97. The angle formed between the two plain lines of the right conical surface, i.e., the second helical conical surface 422 of the tapered hole, is the second taper angle 2. The right taper 96 is formed on the second helical conical surface 422 of the tapered hole 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.

[0059] According to the connection structure of the bolt and double nuts in the present embodiment, the double nuts include a nut body 21 and a nut body 22. The nut body 21 is located on the left side of a fastened workpiece 130, and the nut body 22 is located on the right side of the fastened workpiece 130. When the bolt and the double nuts work, the relationship between the connection structure and the fastened workpiece 130 is rigid connection. The rigid connection is that a nut end face bearing surface and a bearing surface of the workpiece 130 are mutually bearing surfaces, including a locking bearing surface 111 and a locking bearing surface 112. The workpiece 130 refers to a connected object including the workpiece 130.

[0060] In the present embodiment, the thread operation bearing surfaces are different and include a tapered thread bearing surface 121 and a tapered thread bearing surface 122. When the cylindrical body 2 is located on the left side of the fastened workpiece 130, that is, when the left end face of the fastened workpiece 130 and the right end face of the cylindrical body 2, i.e., the left nut body 21, is the locking bearing surface 111 of the left nut body 21 and the fastened workpiece 130, a right helical conical surface of the left nut body 21 and the columnar body 3, i.e., a screw body 31. Namely, the second helical conical surface 422 of the tapered hole and the second helical conical surface 722 of the truncated cone body are tapered thread bearing surfaces 122, and the second helical conical surface 422 of the tapered hole and the second helical conical surface 722 of the truncated cone body are mutually bearing surfaces. When the cylindrical body 2 is located on the right side of the fastened workpiece 130, that is, when the right end face of the fastened workpiece 130 and the left end face of the cylindrical body 2, i.e., the right nut body 22, is the locking bearing surface 112 of the right nut body 22 and the fastened workpiece 130, a left helical conical surface of the right nut body 22 and the columnar body 3, i.e., the screw body 31, is a thread operation bearing surface. Namely, the first helical conical surface 421 of the tapered hole and the first helical conical surface 721 of the truncated cone body are tapered thread bearing surfaces 121, and the first helical conical surface 421 of the tapered hole and the first helical conical surface 721 of the truncated cone body are mutually bearing surfaces.

[0061] According to the bolt and nut of the bidirectional tapered thread, 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 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 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 bidirectional jointed, i.e., the effective bidirectional contact cohered, 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 truncated cone body 7 by the bidirectional tapered hole 4 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 connection structure of the bolt of the bidirectional tapered thread and the nut.

[0062] When the bolt of the bidirectional tapered thread and the nut is used for fastening connection and sealing connection, the technical performances 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 until 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 until 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 until the first helical conical surface 421 of the tapered hole is adhered with the first helical conical surface 721 of the truncated cone body until 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 until the sizing interference contact is achieved, so as to realize the technical performances of a mechanical mechanism, such as connection, locking, anti-loosening, bearing, fatigue and sealing.

[0063] 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 bolt and nut of the bidirectional tapered thread 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.

[0064] In the bolt and nut of the bidirectional tapered thread, when the right-angled trapezoid union rotates a circle at a constant speed, the axial movement distance of the right-angled trapezoid union is at least double 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.

[0065] In the bolt and nut of the bidirectional tapered thread, when the right-angled trapezoid union rotates a circle at a constant speed, the axial movement distance of the right-angled trapezoid union is equal to 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.

[0066] In the bolt and nut of the bidirectional tapered thread, 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.

[0067] In the bolt and nut of the bidirectional tapered thread, 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.

[0068] In the bolt and nut of the bidirectional tapered thread, 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.

[0069] Compared with the prior art, the tapered thread connection pair 10 of the bolt and nut connection structure of the bidirectional tapered thread has the advantages of reasonable design, simple structure, convenient operation, large locking force, 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

[0070] 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, in the present embodiment, a connection structure of bolts and single nuts is adopted, and the bolt body is provided with a hexagon head part greater than the screw body 31. When the hexagon head part is located on the left side, the cylindrical body 2, i.e., the nut body 21, i.e., the single nut, is located on the right side of the fastened workpiece 130. During operation, the relationship between the connection structure of the bolts and the single nuts in the present embodiment and the fastened workpiece 130 is also the rigid connection. The rigid connection is that opposite end faces of an end face of the nut body 21 and an end face of the workpiece 130 are mutually bearing surfaces. The bearing surfaces are the locking bearing surfaces 111. The workpiece 130 refers to a connected object including the workpiece 130.

[0071] In the present embodiment, the thread operation bearing surface is the tapered thread bearing surface 122, i.e., the cylindrical body 2, i.e., the nut body 21, i.e., the single nut, is located on the right side of the fastened workpiece 130. During operation of the connection structure of the bolts and the single nuts, the right end face of the fastened workpiece and the left end face of the nut body 21 are the locking bearing surfaces 111 of the nut body 21 and the fastened workpiece 130, a left helical conical surface of the nut body 21 and the columnar body 3, i.e., the screw body 31, i.e., the bolted bidirectional tapered thread 1, is a thread operation bearing surface. Namely, the first helical conical surface 421 of the tapered hole and the first helical conical surface 721 of the truncated cone body of the tapered external thread 9 are tapered thread bearing surfaces 122, and the first helical conical surface 421 of the tapered hole and the first helical conical surface 721 of the truncated cone body are mutually bearing surfaces.

[0072] In the present embodiment, when the bolt hexagon head part is located on the right side, the structures, principles and implementation steps are similar to those in the present embodiment.

Embodiment 3

[0073] 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, position relations of the double nuts and the fastened workpiece 130 are different. The double nuts include a nut body 21 and a nut body 22, and the bolt body is provided with a hexagon head part greater than the screw body 31. When the hexagon head part is located on the left side, both the nut body 21 and the nut body 22 are located on the right side of the fastened workpiece 130. During operation of the connection structure of the bolts and the double nuts, the relationship between the nut body 21 and the nut body 22 and the fastened workpiece 130 is the non-rigid connection. The non-rigid connection is that, opposite lateral end faces of the two nuts, i.e., the nut body 21 and the nut body 22 are mutually bearing surfaces. The bearing surfaces include the locking bearing surface 111 and the locking bearing surface 112, and are mainly applied to non-rigid connection workpieces 130 such as non-rigid materials or driving parts or application fields in which requirements are met by virtue of double-nut installation. The workpiece 130 refers to a connected object including the workpiece 130.

[0074] In the present embodiment, the thread operation bearing surfaces are different and include a tapered thread bearing surface 121 and a tapered thread bearing surface 122. The cylindrical body 2 includes the left nut body 21 and the right nut body 22. The right end face of the left nut body 21, i.e., the locking bearing surface 111 and the left end face of the right nut body 22, i.e., the locking bearing surface 122 are in opposite and direct contact and are mutually locking bearing surfaces. When the right end face of the left nut body 21 is the locking bearing surface 111, a right helical conical surface of the left nut body 21 and the columnar body 3, i.e., a screw body 31, i.e., the bolted bidirectional tapered thread 1, is a thread operation bearing surface. Namely, the second helical conical surface 422 of the tapered hole and the second helical conical surface 722 of the truncated cone body of the tapered external thread 9 are tapered thread bearing surfaces 122, and the special conical surface 42 of the traditional internal thread 6 and the second helical conical surface 722 of the truncated cone body are mutually bearing surfaces. When the left end face of the right nut body 22 is the locking bearing surface 122, a left helical conical surface of the right nut body 22 and the columnar body 3, i.e., the screw body 31, i.e., the bolted bidirectional tapered thread 1, is a thread operation bearing surface. Namely, the first helical conical surface 421 of the tapered hole and the first helical conical surface 721 of the truncated cone body of the tapered external thread 9 are tapered thread bearing surfaces 121, and the first helical conical surface 421 of the tapered hole and the first helical conical surface 721 of the truncated cone body are mutually bearing surfaces.

[0075] In the present embodiment, when the cylindrical body 2 located on the inner side, i.e., the nut body 21 adjacent to the fastened workpiece 130, has been effectively jointed with the columnar body 3, i.e., the screw body 31, i.e., the bolt, that is, when the internal thread 6 and the external thread 9 forming the tapered thread connection pair 10 are effectively cohered together, the cylindrical body 2 located on the outer side, i.e., a nut body that is not adjacent to the fastened workpiece 130, may maintain the original shape and/or be removed according to needs of application conditions, while only one nut is remained (e.g., application fields in which requirements on equipment lightweight exist or connection technology reliability is ensured without double nuts). The removed nut body 22 does not serve as a connecting nut, but an installation process nut. Internal threads of the installation process nuts are manufactured from the bidirectional tapered threads, and may also be nut bodies 22 manufactured from threads of other threads that may be screwed with the tapered threads 1, including triangular threads, trapezoidal threads, sawtooth threads and the like, which is the precondition of ensuring the connection technology reliability. The tapered thread connection pair 10 is a closed loop fastening technology system. Namely, after the internal thread 6 and the external thread 9 of the tapered thread connection pair 10 are effectively cohered together, the tapered thread connection pair 10 may form an independent technology system itself without depending on technical compensation of a third party, so as to ensure the technical effectiveness of the connection technology system. Even if there is no support of other objects, and even if a gap exists between the thread connection pair 10 and the fastened workpiece 130, effectiveness of the tapered thread connection pair 10 is not influenced, which contributes to greatly lightening equipment weight, removing invalid loads, and improving technical requirements of equipment, such as payload capability, brake performance and energy conservation and emission reduction. The above descriptions are thread technology advantages that are not owned by other thread technologies when the relationship between the tapered thread connection pair 10 of the bolt and nut connection structure of the bidirectional tapered thread and the fastened workpiece 130 is the rigid connection or non-rigid connection.

[0076] In the present embodiment, when the bolt hexagon head part is located on the right side, both the nut body 21 and the nut body 22 are located on the right side of the fastened workpiece 130, and the structures, principles and implementation steps are similar to those in the present embodiment.

Embodiment 4

[0077] As shown in FIG. 6, the structures, principles and implementation steps in the present embodiment are similar to those in the embodiment 1 and embodiment 3. The differences are that, in the present embodiment, a spacer like a gasket 132 is increased between the nut body 21 and the nut body 22 on the basis of the embodiment 3. Namely, the right end face of the left nut body 21 and the left end face of the right nut body 22 are in opposite and indirect contact by virtue of the gasket 132 so as to be indirectly mutually locking bearing surfaces, i.e., a mutual relation between the right end face of the left nut body 21 and the left end face of the right nut body 22 is changed from directly mutual locking bearing surfaces to indirectly mutual locking bearing surfaces.

[0078] 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.

[0079] The terms such as tapered thread 1, cylindrical body 2, nut body 21, nut body 22, columnar body 3, screw body 31, tapered hole 4, bidirectional tapered hole 41, conical surface 42 of 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, 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, 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, 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, locking bearing surface 111, locking bearing surface 112, tapered thread bearing surface 122, tapered thread bearing surface 121, non-entity space, material entity, workpiece 130, nut body locking direction 131, non-rigid connection, non-rigid material, driving part, gasket 132 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.