CONNECTION STRUCTURE OF BOLT AND NUT OF ASYMMETRIC BIDIRECTIONAL TAPERED THREAD IN OLIVE-LIKE SHAPE

Abstract

The present invention belongs to the field of general technology of device, and particularly relates a connection structure of a bolt and a nut of an asymmetric bidirectional tapered thread in an olive-like shape, which solves the problems such as poor self-positioning and self-locking performance of the existing screw thread. The connection structure is characterized in that an external thread (9) is a bidirectional tapered hole (41) (non-entity space) in an internal surface of a cylindrical body (2); an external thread (9) is a bidirectional truncated cone body (71) (material entity) on an external surface of a columnar body (3); and a complete unit thread is a helical bidirectional tapered body in an olive-like shape (93) in which a left taper (95) is greater than and/or less than a right taper (96).

Claims

1. A connection structure of a bolt and a nut of an asymmetric bidirectional tapered thread in an olive-like shape, comprising an external thread (9) and an internal thread (6) in mutual threaded fit, wherein a complete unit thread of the asymmetric bidirectional tapered internal thread (6) in the olive-like shape (93) is a helical asymmetric bidirectional tapered body in an olive-like shape (93), with a large middle and two small ends, and with different sizes in a left taper (95) and a right taper (96), the helical asymmetric bidirectional tapered body in the olive-like shape (93) comprises a bidirectional tapered hole (41) and/or a bidirectional truncated cone body (71), and the complete unit thread comprises two taper structure forms in which the left taper (95) is greater than the right taper (96) and the left taper (95) is less than the right taper (96); a thread body of the internal thread (6) is the helical bidirectional tapered hole (41) in an internal surface of a cylindrical body (2) and exists in the form of a non-entity space; a thread body of the external thread (9) is a helical bidirectional truncated cone body (71) formed on an external surface of a columnar body (3) and exists in the form of a material entity; the left taper (95) formed by a left conical surface of the asymmetrical bidirectional tapered body corresponds to a first taper angle (1), and the right taper (96) formed by a right conical surface corresponds to a second taper angle (2); the left taper (95) and the right taper (96) are opposite in direction and different in taper size; the internal thread (6) and the external thread (9) are in thread fit to house a cone in the tapered hole until an internal conical surface and an external conical surface mutually bear; technical performances mainly depend on the conical surfaces and the taper sizes of the screw thread bodies in mutual fit; the left taper (95) is greater than the right taper (96), preferably, the first taper angle (1) is greater than 0 and less than 53, and the second taper angle (2) is greater than 0 and less than 53; and for individual special fields, preferably, the first taper angle (1) is greater than or equal to 53 and less than 180; and the left taper (95) is less than the right taper (96), preferably, the first taper angle (1) is greater than 0 and less than 53, and the second taper angle (2) is greater than 0 and less than 53; and for individual special fields, preferably, the second taper angle (2) is greater than or equal to 53 and less 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, that is, a first helical conical surface (421) of the tapered hole, and a right conical surface, that is, a second helical conical surface (422) of the tapered hole of a bidirectional conical surface (42) of the tapered hole, and an internal helical line (5); a shape formed by the first helical conical surface (421) of the tapered hole and the second helical conical surface (422) of the tapered hole, that is, a bidirectional helical conical surface, is the same as a shape of an external helical lateral surface of a rotary body, wherein the rotary body is formed by two inclined sides of a 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) while circumferentially rotating at a constant speed with right-angled sides of the right-angled trapezoid union as a rotation center, wherein the right-angled trapezoid union is formed by symmetrically and oppositely joining lower bottom sides of two right-angled trapezoids with the same lower bottom sides and the same upper bottom sides but different right-angled sides, wherein the right-angled trapezoids coincide with the central axis of the cylindrical body (2); the bidirectional tapered external thread (9) in the olive-like shape (93) comprises a left conical surface, that is, a first helical conical surface (721) of the truncated cone body, and a right conical surface, that is, a second helical conical surface (722) of the truncated cone body of a bidirectional conical surface (72) of the truncated cone body, and an external helical line (5); and a 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, that is, a bidirectional helical conical surface, is the same as a shape of an external helical lateral surface of a rotary body, wherein the rotary body is formed by two inclined sides of a 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) while circumferentially rotating at a constant speed with right-angled sides of the right-angled trapezoid union as a rotation center, wherein the right-angled trapezoid union is formed by symmetrically and oppositely joining lower bottom sides of two right-angled trapezoids with the same lower bottom sides and the same upper bottom sides but different right-angled sides, wherein the right-angled trapezoids coincide with the central axis of the columnar body (3).

3. The connection structure according to claim 2, wherein when the right-angled trapezoid union makes one revolution at a constant speed, a distance that the right-angled trapezoid union axially moves is equal to at least one times the sum of the lengths of right-angled sides of the two right-angled trapezoids.

4. The connection structure according to claim 2, wherein when the right-angled trapezoid union makes one revolution at a constant speed, a distance that the right-angled trapezoid union axially moves is equal to the sum of the lengths of right-angled sides of the two right-angled trapezoids.

5. The connection structure according to claim 1, wherein the left conical surface and the right conical surface, that is, 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) of the bidirectional tapered body are both continuous helical surfaces or non-continuous helical surfaces; and 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 all continuous helical surfaces or non-continuous helical surfaces.

6. The connection structure according to claim 1, wherein the internal thread (6) is formed by symmetrically and oppositely joining lower bottom surfaces of two tapered holes (7) with the same lower bottom surfaces and the upper top surfaces and different cone heights, and upper top surfaces are disposed on two ends of the bidirectional tapered hole (41) to form an asymmetric bidirectional tapered thread (1) in the olive-like shape (93), and the process comprises that the upper top surfaces are respectively fitted with upper top surfaces of adjacent bidirectional tapered holes (41) and/or respectively fitted with upper top surfaces of adjacent bidirectional tapered holes (41) in a helical form so as 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 joining lower bottom surfaces of two truncated cone bodies (7) with the same lower bottom surfaces and the upper top surfaces and different cone heights, and upper top surfaces are disposed on two ends of the bidirectional truncated cone bodies (71) to form the asymmetric bidirectional tapered thread (1) in the olive-like shape (93), and the process comprises that the upper top surfaces are respectively fitted with upper top surfaces of adjacent bidirectional truncated cone bodies (71) and/or respectively fitted with upper top surfaces of adjacent bidirectional truncated cone bodies (71) in a helical form so as to form the asymmetric bidirectional tapered external thread (9) in the olive-like shape (93).

7. The connection structure according to claim 1, wherein the internal thread (6) and the external thread (9) form a thread pair (10) in such a way that the first helical conical surface (421) of the tapered hole and the second helical conical surface (422) of the tapered hole as well as the first helical conical surface (721) of the truncated cone body and the second helical conical surface (722) of the truncated cone body achieve that internal and external diameters of an internal cone and an external cone are centralized by taking a contact surface as a bearing surface under the guidance of the helical line until the bidirectional tapered hole conical surface (42) and the bidirectional truncated cone body conical surface (72) are cohered to achieve load bearing in one direction of the helical conical surface and/or simultaneous load bearing in both directions of the helical conical surface and/or until the sizing self-positioning contact and/or until the sizing interference contact to achieve self-locking.

8. The connection structure according to claim 1, wherein a screw body (31) of the columnar body (3) is provided with one and/or two asymmetrical bidirectional tapered threads (1) in olive-like shapes (93) comprising an asymmetrical bidirectional tapered external thread (9) in an olive-like shape in which the left taper (95) is greater than the right taper (96) and/or an asymmetrical bidirectional tapered external thread (9) in an olive-like shape in which the left taper (95) is less than the right taper (96); when a connecting hole of the cylindrical body (2) is screwed into a screwing end of the columnar body (3), there is a requirement for a screwing direction, that is, the connecting hole of the cylindrical body (2) can not be screwed reversely, and the connecting hole is a threaded hole provided in a nut (21) and a nut (22), and the connecting hole is disposed within the nut (21) and the nut (22); the nut refers to an object comprising a nut in which a threaded structure is disposed on an internal surface of the cylindrical body (2); when a single nut and/or double nuts and/or a plurality of nuts of the asymmetrical bidirectional tapered internal thread (6) in the olive-like shape and the asymmetrical bidirectional tapered external thread (9) in the olive-like shape of the screw body (31) of the columnar body (3) are in mutual thread fit, a screw thread of the cylindrical body (2) comprises one and/or two asymmetrical bidirectional tapered threads (1) in olive-like shapes (93) comprising an asymmetrical bidirectional tapered internal thread (6) in an olive-like shape in which the left taper (95) is greater than the right taper (96) and/or an asymmetrical bidirectional tapered internal thread (6) in an olive-like shape in which the left taper (95) is less than the right taper (96).

9. The connection structure according to claim 8, wherein when one nut has been effectively cohered with a bolt together, that is, the internal thread (6) and the external thread (9) forming a tapered thread connection pair (10) are effectively cohered together, an additional nut may be removed or retained, the removed nut is only used as a mounting process nut, an internal thread of the mounting process nut comprises a traditional screw thread comprising a bidirectional tapered thread (1), a unidirectional tapered thread as well as a triangular thread, a trapezoidal thread, a sawtooth thread, a rectangular thread, an arc thread and other geometric threads capable of conforming to the technical spirit of the present invention only when the thread body is in mutual thread fit with the bidirectional tapered external thread (9).

10. The connection structure according to claim 1, wherein the internal thread (6) and/or the external thread (9) comprise and/or comprises that a single-pitch thread body is an incomplete tapered geometry, that is, the single-pitch thread body is an incomplete unit thread.

Description

DESCRIPTION OF THE DRAWINGS

[0044] FIG. 1 is a schematic diagram showing a connection structure of a bolt and double nuts of an asymmetric bidirectional tapered thread in an olive-like shape (in which a left taper is greater than a right taper) according to a first embodiment of the present invention.

[0045] FIG. 2 is a schematic diagram showing a structure of a bolt of an external thread of an asymmetric bidirectional tapered thread in an olive-like shape (in which a left taper is greater than a right taper) and a complete unit thread thereof according to a first embodiment of the present invention.

[0046] FIG. 3 is a schematic diagram showing a structure of a nut body of an internal thread of an asymmetric bidirectional tapered thread in an olive-like shape (in which a left taper is greater than a right taper) and a complete unit thread thereof according to a first embodiment of the present invention.

[0047] FIG. 4 is a schematic diagram showing a connection structure of a bolt and double nuts of an asymmetric bidirectional tapered thread in an olive-like shape (in which a left taper is greater than a right taper) according to a second embodiment of the present invention.

[0048] FIG. 5 is a schematic diagram showing a connection structure of a bolt and a single nut of an asymmetric bidirectional tapered thread in an olive-like shape (in which a left taper is greater than a right taper) according to a third embodiment of the present invention.

[0049] FIG. 6 is a schematic diagram showing a connection structure of a bolt and double nuts (a gasket is provided therebetween) of an asymmetric bidirectional tapered thread in an olive-like shape (in which a left taper is greater than a right taper) according to a third embodiment of the present invention.

[0050] FIG. 7 is a schematic diagram showing a connection structure of a bolt and double nuts of an asymmetric bidirectional tapered thread in an olive-like shape (in which a left taper is less than a right taper) according to a fourth embodiment of the present invention.

[0051] FIG. 8 is a schematic diagram showing a structure of a bolt of an external thread of an asymmetric bidirectional tapered thread in an olive-like shape (in which a left taper is less than a right taper) and a complete unit thread thereof according to a fourth embodiment of the present invention.

[0052] FIG. 9 is a schematic diagram showing a structure of a nut body of an internal thread of an asymmetric bidirectional tapered thread in an olive-like shape (in which a left taper is less than a right taper) and a complete unit thread thereof according to a fourth embodiment of the present invention.

[0053] FIG. 10 is a schematic diagram showing a connection structure of a hybrid combination of bolts of asymmetric bidirectional tapered external threads in two olive-like shapes including an asymmetric bidirectional tapered thread in an olive-like shape (in which a left taper is less than a right taper) and an asymmetric bidirectional tapered thread in an olive-like shape (in which a left taper is greater than a right taper) and double nuts of an asymmetric bidirectional tapered thread in an olive-like shape according to a fifth embodiment of the present invention.

[0054] FIG. 11 is a schematic diagram showing a structure of bolts of asymmetric bidirectional tapered external threads in two olive-like shapes including two taper structure forms of an olive-like shape (in which a left taper is less than a right taper) and an olive-like shape (in which a left taper is greater than a right taper) and a complete unit thread according to a fifth embodiment of the present invention.

[0055] FIG. 12 is a schematic diagram showing a structure of a nut body of an internal thread of an asymmetric bidirectional tapered thread in an olive-like shape (in which a left taper is greater than a right taper) and a complete unit thread thereof according to a fifth embodiment of the present invention.

[0056] FIG. 13 is a schematic diagram showing a structure of a nut body of an internal thread of an asymmetric bidirectional tapered thread in an olive-like shape (in which a left taper is less than a right taper) and a complete unit thread thereof according to a fifth embodiment of the present invention.

[0057] FIG. 14 is an illustration that a screw thread in the existing screw thread technology is an inclined surface on a cylindrical surface or a conical surface involved in the background art of the present invention.

[0058] FIG. 15 is an illustration of an inclined surface slider model adopting a principle of the existing screw thread technology, that is, an inclined surface principle involved in the background art of the present invention.

[0059] FIG. 16 is an illustration of a thread lift angle in the existing screw thread technology involved in the background art of the present invention.

[0060] In the figures, 1tapered thread; 2cylindrical body; 21nut body, 22nut body; 3columnar body; 31screw body, 20polish rod; 4tapered hole; 41bidirectional tapered hole; 42bidirectional tapered hole conical surface; 421first helical conical surface of tapered hole; 1first taper angle; 422second helical conical surface of tapered hole; 2second taper angle; 5internal helical line; 6internal thread; 7special tapered body; 71: bidirectional truncated cone body; 72bidirectional truncated cone body conical surface; 721first helical conical surface of truncated cone body; 1first taper angle; 722: second helical conical surface of truncated cone body; 2second taper angle; 8external helical line; 9external thread; 93olive-like shape; 95left taper, 96right taper; 97leftward distribution; 98rightward distribution; 10connection pair for thread and/or thread pair; 101clearance; 111locking bearing surface; 112locking bearing surface; 122bearing surface of tapered thread; 121bearing surface of tapered thread; 130workpiece; 01cone axis; 02thread axis; Aslider on inclined surface body; Binclined surface body; Ggravity; G1gravity component along inclined surface; Ffriction force; thread lift angle; Pequivalent friction angle; dmajor diameter of traditional external thread; d1minor diameter of traditional external thread; and d2pitch diameter of traditional external thread.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

[0061] The present invention will be further described in detail below in conjunction with accompanying drawings and the specific embodiments.

A First Embodiment

[0062] As shown in FIG. 1, FIG. 2 and FIG. 3, the present embodiment provides a connection structure of a bolt and two nuts, including a bidirectional truncated cone body 71 helically distributed on the external surface of the columnar body 3 and a bidirectional tapered hole 41 helically distributed on the internal surface of the cylindrical body 2, that is, an external thread 9 and an internal thread 5 in mutual thread fit, the internal thread 6 is provided with the bidirectional helical tapered hole 41 and exists in the form of a non-entity space, and the external thread is provided with the bidirectional helical truncated cone body 71 and exists in the form of a material entity. The internal thread 6 and the external thread 9 are in a relationship of a housing member and a housed member. The threads work in such a state that the internal thread 6 and the external thread 9 are fitted together by screwing the two bidirectional tapered geometries pitch by pitch, and the internal thread is cohered with the external thread till the external thread and the internal thread are in interference fit, that is, the bidirectional tapered hole 41 houses the bidirectional truncated cone body 71 pitch by pitch. Bidirectional housing limits a disordered degree of freedom between the tapered hole 4 and the truncated cone body 7, and the helical movement allows the tapered thread connection pair 10 of the bolt and the nuts of the bidirectional tapered thread the to obtain a necessary ordered degree of freedom. Accordingly, technical characteristics of a cone pair and a thread pair are effectively composed.

[0063] According to the connection structure of the bolt and the nuts of the bidirectional tapered thread in the present embodiment, the tapered thread connection pair 10 has self-locking and self-positioning properties as long as the truncated cone body 7 and/or the tapered hole 4 of the tapered thread connection pair 10 reach/reaches a certain taper, that is, the cone constituting the cone pair reaches a certain taper angle. The tapers include a left taper 95 and a right taper 96, and the taper angles include a left taper angle and a right taper angle. In the asymmetric bidirectional tapered thread 1 of the present embodiment, the left taper 95 is greater than the right tapers 96. The left taper 95 corresponds to the left taper angle, that is, the first taper angle 1, preferably, the first taper angle 1 is greater than 0 and less than 53, preferably, the first taper angle 1 takes a value in a range from 2 to 40. For individual special fields, that is, connection application fields without self-locking property and/or with poor self-positioning property and/or with high axial load bearing capacity requirement, preferably, the first taper angle 1 is greater than or equal to 53 and less than 180, and preferably, the first taper angle 1 takes a value in a range from 53 to 90; and the right taper 96 corresponds to the right taper angle, that is, the second taper angle 2, preferably, the second taper angle 2 is greater than 0 and less than 53, and the second taper angle 2 takes a value in a range from 2 to 40.

[0064] The external thread 9 is arranged on the external surface of the columnar body 3, wherein a screw body 31 is disposed on the columnar body 3, a helically distributed truncated cone body 7 including an symmetric bidirectional truncated cone body 71 is disposed on the external surface of the screw body 31, the asymmetric bidirectional truncated cone body 71 is a special bidirectional conical geometry in an olive-like shape 93, and the columnar body 3 may be solid or hollow, including workpieces and objects such as cylinders, cones, pipes and the like that need to be machined with external threads on their external surfaces.

[0065] The asymmetric bidirectional truncated cone body 71 in an olive-like shape 93 is characterized by being formed by symmetrically and oppositely joining lower bottom surfaces of the two truncated cone bodies with the same lower bottom surfaces and the same upper top surfaces but different heights, and upper top surfaces are disposed on two ends of the bidirectional truncated cone bodies 71 to form the asymmetric bidirectional tapered thread 1, and the process includes that the upper top surfaces are respectively fitted with upper top surfaces of adjacent bidirectional truncated cone bodies 71 and/or respectively fitted with upper top surfaces of adjacent bidirectional truncated cone bodies 71. The asymmetric bidirectional truncated cone body conical surface 72 is disposed on the external surface of the truncated cone body 7. 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. Within a cross section passing through the thread axis 02, the complete single-pitch asymmetric bidirectional tapered external thread 9 is a special bidirectional tapered geometry in an olive-like shape 93, with a large middle and two small ends, and with the taper of the left truncated cone body greater than that of the right truncated cone body. The asymmetric bidirectional truncated cone body 71 includes a bidirectional conical surface 72 of the truncated cone body, wherein an included angle between two plain lines of a left conical surface (that is, the first helical conical surface 721 of the truncated cone body) of the asymmetric bidirectional truncated cone body 71 is a first taper angle 1, and the first helical conical surface 721 of the truncated cone body forms the left taper 95 and is in a leftward distribution 97; and an included angle 2 between two plain lines of a right conical surface (that is, the second helical conical surface 722 of the truncated cone body) of the asymmetric bidirectional truncated cone body 71 is a second taper angle 2, and the second helical conical surface 722 of the truncated cone body forms the right taper and is in a rightward distribution 98. Taper directions corresponding to the first taper angle 1 and the second taper angle 2 are opposite, and the plain lines are intersecting lines of the conical surface with the plane passing through the cone axis 01. A 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 of the bidirectional truncated cone body 71 is the same as a shape of an external helical lateral surface of a rotary body, wherein the rotary body is formed by two inclined sides of a 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 while circumferentially rotating at a constant speed with right-angled sides of the right-angled trapezoid union as a rotation center, wherein the right-angled trapezoid union is formed by symmetrically and oppositely joining lower bottom sides of two right-angled trapezoids with the same lower bottom sides and the same upper bottom sides but different right-angled sides, wherein the right-angled trapezoids coincide with the central axis of the columnar body 3. The right-angled trapezoid union refers to a special geometry in which the lower bottom sides of the two right-angled trapezoids with the same lower bottom sides and the same upper bottom sides but different right-angled sides are symmetrically and oppositely joined and the upper bottom sides thereof are respectively located at two ends of the right-angled trapezoid union.

[0066] The internal thread 6 is arranged on the internal surface of the cylindrical body 2, wherein the cylindrical body 2 includes a nut body 21 and a nut body 22, wherein a helically distributed tapered hole 4 including an asymmetric bidirectional tapered hole 41 is provided in the nut body 21, the asymmetric bidirectional tapered hole 41 is a special bidirectional conical geometry in an olive-like shape 93, and the cylindrical body 2 includes cylindrical workpieces and objects and/or non-cylindrical workpieces and objects that need to be machined with internal threads on their internal surfaces.

[0067] The asymmetric bidirectional tapered hole 41 in an olive-like shape 93 is characterized by being formed by symmetrically and oppositely joining lower bottom surfaces of the two tapered holes with the same lower bottom surfaces and the same upper top surfaces but different heights, and upper top surfaces are disposed on two ends of the bidirectional tapered hole 41 to form the bidirectional tapered thread 1, and the process includes that the upper top surfaces are respectively fitted with upper top surfaces of adjacent bidirectional tapered holes 41 and/or respectively fitted with upper top surfaces of adjacent bidirectional tapered holes 41. The internal thread 6 includes a first helical conical surface 421 of the tapered hole, a second helical conical surface 421 of the tapered hole, and an internal helical line 5. Within a cross section passing through the thread axis, the complete single-pitch symmetric bidirectional tapered internal thread 6 is a special bidirectional tapered geometry in an olive-like shape 93, with a large middle and two small ends, and with the taper of the left tapered hole greater than that of the right tapered hole. The bidirectional tapered hole 41 includes a bidirectional tapered hole conical surface 42, wherein an included angle between two plain lines of a left conical surface (that is, the first helical conical surface 421 of the tapered hole) of the bidirectional tapered hole 41 is a first taper angle 1, and the first helical conical surface 421 of the tapered hole forms the left taper 95 and is in a leftward distribution 97; and an included angle 2 between two plain lines of a right conical surface (that is, the second helical conical surface 422 of the tapered hole) of the bidirectional tapered hole 41 is a second taper angle 2, and the second helical conical surface 422 of the tapered hole forms the right taper 96 and is in a rightward distribution 98. Taper directions corresponding to the first taper angle 1 and the second taper angle 2 are opposite, and the plain lines are intersecting lines of the conical surface with the plane passing through the cone axis. A shape formed by the first helical conical surface 421 of the tapered hole and the second helical conical surface 422 of the tapered hole of the bidirectional tapered hole 41 is the same as a shape of an external helical lateral surface of a rotary body, wherein the rotary body is formed by two inclined sides of a 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 while circumferentially rotating at a constant speed with right-angled sides of the right-angled trapezoid union as a rotation center, wherein the right-angled trapezoid union is formed by symmetrically and oppositely joining lower bottom sides of two right-angled trapezoids with the same lower bottom sides and the same upper bottom sides but different right-angled sides, wherein the right-angled trapezoids coincide with the central axis of the cylindrical body 2. The right-angled trapezoid union refers to a special geometry in which the lower bottom sides of the two right-angled trapezoids with the same lower bottom sides and the same upper bottom sides but different right-angled sides are symmetrically and oppositely joined and the upper bottom sides thereof are respectively located at two ends of the right-angled trapezoid union.

[0068] The connection structure of the bolt and the double nuts is adopted in the present embodiment. The double nuts include a nut body 21 and a nut body 22, wherein the nut body 21 is located at the left side of a fastened workpiece 130, and the nut body 22 is located at the right side of the fastened workpiece 130. During operation, the connection structure of the bolt and the double nuts is in a relationship of a rigid connection with the fastened workpiece 130. The rigid connection means that a bearing surface on the end surface of each nut and a bearing surface of the workpiece 130 serve as bearing surfaces each other, and the bearing surfaces include a locking bearing surface 111 and a locking bearing surface 112. The workpiece 130 refers to a connected object including the workpiece 130.

[0069] Thread working bearing surfaces in the present embodiment are different and include a bearing surface 121 of the tapered thread and a bearing surface 122 of the tapered thread. When a cylindrical body 2 is located at the left side of the fastened workpiece 130, that is, the left end surface of the fastened workpiece 130 and the right end surface of the cylindrical body 2, that is, the left nut body 21, are the locking bearing surfaces 111 of the left nut body 21 and the fastened workpiece 130, right helical conical surfaces of bidirectional tapered threads 1 of the left nut body 21 and the columnar body 3, that is, the screw body 31, that is, the bolt, are thread working bearing surfaces, that is, the second helical conical surface 422 of the tapered hole and the second helical conical surface 722 of the truncated cone body are bearing surfaces 122 of the tapered thread, and the second helical conical surface 422 of the tapered hole and the second helical conical surface 722 of the truncated cone body serve as bearing surfaces each other. When the cylindrical body 2 is located at the right side of the fastened workpiece 130, that is, the right end surface of the fastened workpiece 130 and the left end surface of the cylindrical body 2, that is, a right nut body 22 are the locking bearing surfaces 112 of the right nut body 22 and the fastened workpiece 130, left helical conical surfaces of the bidirectional tapered threads 1 of the right nut body 22 and the columnar body, that is, the screw body 31, that is, the bolt, are tapered working bearing surfaces, that is, the first helical conical surface 421 of the tapered hole and the first helical conical surface 721 of the truncated cone body are bearing surfaces 121 of the tapered thread, and the first helical conical surface 421 of the tapered hole and the first helical conical surface 721 of the truncated cone body serve as bearing surfaces each other.

[0070] When the connection structure of the bolt and the nuts of the bidirectional tapered thread is in transmission connection, bidirectional load bearing is achieved by the screw connection of the bidirectional tapered hole 41 and the bidirectional truncated cone body 71. There must be a clearance 101 between the bidirectional tapered hole 41 and the bidirectional truncated cone body 71. The clearance 101 is conducive to the formation of a load bearing oil film. The tapered thread connection pair 10 is equivalent to a group of sliding bearing pairs composed of one pair and/or several pairs of sliding bearings, that is, each pitch of the bidirectional tapered internal thread 6 bidirectionally houses the corresponding pitch of the bidirectional tapered external thread 9 to form a pair of sliding bearings, the number of the sliding bearings formed is adjusted according to the application conditions, that is, the number of the pitches of the housing screw threads and the housed screw threads for the effective bidirectional joint, that is, the effective bidirectional contact cohesion, of the bidirectional tapered internal thread 6 and the bidirectional tapered external thread 9 is designed according to the application conditions. Through bidirectional housing of the tapered hole 4 for the bidirectional truncated cone body 7 and positioning in multiple directions such as radial, axial, angular, and circumferential directions, the transmission connecting accuracy, efficiency and reliability of the bidirectional tapered thread are ensured.

[0071] When the connection structure of the bolt and the nuts of the bidirectional tapered thread in the present embodiment is in fastened and sealed connections, technical performances are achieved by the screw connection of the bidirectional tapered hole 41 and the bidirectional truncated cone body 71, that is, the first helical conical surface 721 of the truncated cone body and the first helical conical surface 421 of the tapered hole are sized until the interference and/or the second helical conical surface 722 of the truncated cone body and the second helical conical surface 422 of the tapered hole are sized until the interference. Load bearing in one direction and/or in two directions simultaneously are/is achieved according to the application conditions, that is, the bidirectional truncated cone body 71 and the bidirectional tapered hole 41 achieve that internal and external diameters of the internal cone and the external cone are centralized under the guidance of the helical line until the first helical conical surface 421 of the tapered hole and the first helical conical surface 721 of the truncated cone body are cohered until the interference contact and/or the second helical conical surface 422 of the tapered hole and the second helical conical surface 722 of the truncated cone body are cohered until the interference contact, thereby achieving technical performances such as connecting performance, locking capability, anti-loosening property, load bearing capability, fatigue resistance and sealing property of a mechanical structure.

[0072] Accordingly, the technical performances such as transmission accuracy and efficiency, load bearing capability, self-locking force, anti-loosening capability, sealing performance and reusability of the connection structure of the bolt and the nuts of the bidirectional tapered thread are related to the first helical conical surface 721 of the truncated cone body and the left taper 95 (that is, the first taper angle 1) formed therefrom and the second helical conical surface 722 of the truncated cone body and the right taper 96 (that is, the second taper angle 2) formed therefrom as well as the first helical conical surface 421 of the tapered hole and the left taper formed 95 (that is, the first taper angle 1) formed therefrom and the second helical conical surface 422 of the tapered hole and the right taper 96 (that is, the second taper angle 2) formed therefrom. The friction coefficient, the processing quality and the application conditions of a material of which the columnar body 3 and the cylindrical body 2 are made have a certain influence on the cone fit.

[0073] In the above-mentioned connection structure of the bolt and the nuts of the bidirectional tapered thread, when the right-angled trapezoid union makes one revolution at a constant speed, a distance that the right-angled trapezoid union axially moves is equal to at least one times the sum of the lengths of right-angled sides of the two right-angled trapezoids with the same lower bottom sides and the same upper bottom sides but different right-angled sides. This structure ensures that the first helical conical surface 721 of the truncated cone body and the second helical conical surface 722 of the truncated cone body as well as the first helical conical surface 421 of the tapered hole and the second helical conical surface 422 of the tapered hole are enough in length, thereby ensuring enough effective contact area and strength when the bidirectional conical surface 72 of the truncated cone body matches with the bidirectional conical surface 42 of the tapered hole, as well as the efficiency required for the helical movement.

[0074] In the above-mentioned connection structure of the bolt and the nuts of the bidirectional tapered thread, when the right-angled trapezoid union makes one revolution at a constant speed, a distance that the right-angled trapezoid union axially moves is equal to the sum of lengths of right-angled sides of the two right-angled trapezoids with the same lower bottom sides and the same upper bottom sides but different right-angled sides. This structure ensures that the first helical conical surface 721 of the truncated cone body and the second helical conical surface 722 of the truncated cone body as well as the first helical conical surface 421 of the tapered hole and the second helical conical surface 422 of the tapered hole are enough in length, thereby ensuring enough effective contact area and strength when the bidirectional conical surface 72 of the truncated cone body matches with the bidirectional conical surface 42 of the tapered hole, as well as the efficiency required for the helical movement.

[0075] In the above-mentioned connection structure of the bolt and the nuts 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 non-continuous helical surfaces. 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 non-continuous helical surfaces.

[0076] In the above-mentioned connection structure of the bolt and the nuts of the bidirectional tapered thread, a connecting hole of the cylindrical body 2 is screwed into a screwing end of the columnar body 3, there is a requirement for a screwing direction of the connecting hole, and the connecting hole is not allowed to be reversely screwed into the screwing end of the columnar body 3.

[0077] In the above-mentioned connection structure of the bolt and the nuts of the bidirectional tapered thread, when a connecting hole of the cylindrical body 2 is screwed into a screwing end of the columnar body 3, there is a requirement for a screwing direction, and it is impossible for the connecting hole of the cylindrical body to be reversely screwed into the screwing end of the columnar body 3. A head a size of which is greater than the external diameter of the columnar body 3 is disposed at one end of the columnar body 3 and/or one head and/or two heads a size of which is less than a minor diameter of the bidirectional tapered external thread 9 of a screw body 31 of the columnar body 3 are/is disposed at one end and/or two ends of the columnar body 3, and the connecting hole is a threaded hole provided in a nut 1. That is, the columnar body 3 and the head are connected as the bolt here, and a stud has no head and/or has heads a size of which is less than the minor diameter of the bidirectional tapered external thread 9 at two ends and/or has no screw thread in the middle and has a bidirectional tapered external thread 9 respectively at two ends.

[0078] Compared with the prior art, the tapered thread connection pair 10 of the connection structure of the bolt and the nuts of the bidirectional tapered thread has the following advantages of reasonable design, simple structure, convenient operation, large locking force, large load bearing capability, good anti-loosening property, high transmission efficiency and accuracy, good mechanical sealing effect and good stability, may prevent the loosening from occurring during the connection, has self-locking and self-positioning functions, and achieves fastening and connecting functions by sizing the diameter of the cone pair formed by the internal cone and the external cone until the interference fit.

A Second Embodiment

[0079] As shown in FIG. 4, the structure, principle and implementation steps of the present embodiment are similar to those of the first embodiment, except that a connection structure of a bolt and a single nut is adopted in the present embodiment, and a bolt body is provided with a hexagonal head larger than the screw body 31. When the hexagonal head of the bolt is located at the left side, the cylindrical body 2, that is, the nut body 21, that is, the single nut, is located at the right side of the fastened workpiece 130. When the connection structure of the bolt and the single nut in the present embodiment operates, the connection structure of the bolt and the single nut are in a relationship of a rigid connection with the fastened workpiece 130. The rigid connection means that end surfaces opposite to an end surface of the nut body 21 and an end surface of the workpiece 130 serve as bearing surfaces each other, and the bearing surface is the locking bearing surface 111. The workpiece 130 refers to a connected object including the workpiece 130.

[0080] The thread working bearing surface in the present embodiment is the bearing surface 122 of the tapered thread, that is, the cylindrical body 2, that is, the nut body 21, that is, the single nut, is located at the right side of the fastened workpiece 130. When the connection structure of the bolt and the single nut operates, the right end surface of the workpiece 130 and the left end surface of the nut body 21 are the locking bearing surfaces 111 of the nut body 21 and the fastened workpiece 130, left helical conical surfaces of bidirectional tapered threads 1 of the nut body and the columnar body 3, that is, the screw body 3, that is, the bolt, are thread working bearing surfaces, that is, the first helical conical surface 421 of the tapered hole and the first helical conical surface 721 of the truncated cone body are bearing surfaces 122 of the tapered thread, and the first helical conical surface 421 of the tapered hole and the first helical conical surface 721 of the truncated cone body serve as bearing surfaces each other.

[0081] In the present embodiment, the structure, principle and implementation steps of the hexagonal head of the bolt are similar to those of the present embodiment when being located at the right side.

A Third Embodiment

[0082] As shown in FIG. 5 and FIG. 6, the structure, principle and implementation steps of the present embodiment are similar to those of the first embodiment, except that there is a different position relationship between each of the double nuts and the fastened workpiece 130, the double nuts include a nut body 21 and a nut body 22, and a bolt body is provided with a hexagonal head larger than the screw body 31. When the hexagonal head of the bolt is located at the left side, the nut body 21 and the nut body 22 are both located at the right side of the fastened workpiece 130. When the connection structure of the bolt and the double nuts operates, the nut body 21, the nut body 22 and the fastened workpiece 130 are in a relationship of a non-rigid connection. The non-rigid connection means that end surfaces at opposite sides of the double nuts, that is, the nut body 21 and the nut body 22, serve as bearing surfaces each other, the bearing surfaces include a locking bearing surface 111 and a locking bearing surface 112. The non-rigid connection is mainly applied to a non-rigid material or a non-rigid connecting workpiece 130 such as a transmission member or application fields in which demands are met by mounting the double nuts. The workpiece 130 refers to a connected object including the workpiece 130.

[0083] Tread working bearing surfaces in the present embodiment are different and include a bearing surface 121 of the tapered thread and a bearing surface 122 of the tapered thread. A cylindrical body 2 includes a left nut body 21 and a right nut body 22, and the right end surface, that is, the locking bearing surface 111, of the left nut body 21 and the left end surface, that is, the locking bearing surface 112, of the right nut body 22 are oppositely in direct contact and serve as locking bearing surfaces each other. When the right end surface of the left nut body 21 is the locking bearing surface 111, right helical conical surfaces of bidirectional tapered threads 1 of the left nut 21 and the columnar body 3, that is, the screw body 31, that is, the bolt, are thread working bearing surfaces, that is, the second helical conical surface 422 of the tapered hole and the second helical conical surface 722 of the truncated cone body are the bearing surfaces 122 of the tapered thread, and the second helical conical surface 422 of the tapered hole and the second helical conical surface 722 of the truncated cone body serve as bearing surfaces each other. When the left end surface of the right nut body 22 is the locking bearing surface 112, left helical conical surfaces of the bidirectional tapered threads 1 of the right nut body 22 and the columnar body 3, that is, the screw body 31, that is, the bolt, are thread working bearing surfaces, that is, the first helical conical surface 421 of the tapered hole and the first helical conical surface 721 of the truncated cone body are bearing surfaces 121 of the tapered thread, and the first helical conical surface 421 of the tapered hole and the first helical conical surface 721 of the truncated cone body serve as bearing surfaces each other.

[0084] In the present embodiment, when the cylindrical body 2 located at the inner side, that is, the nut body 21 adjacent to the fastened workpiece 130, has been effectively combined with a columnar body 3, that is, the screw body 31, that is, the bolt, i.e., an internal thread 6 and an external thread 9 forming a connection pair 10 for a tapered thread are effectively cohered together. A cylindrical body 2 located at the outer side, that is, the nut body 22 not adjacent to the fastened workpiece 130, may keep unchanged and/or may be removed with one nut being retained according to the application condition (such as application fields in which there are requirements on light weight of equipment or it is unnecessary to guarantee the reliability of a connection technology by double nuts), and the removed nut body 22 is only used as a mounting process nut, rather than a connecting nut. An internal thread of the mounting process nut may be produced from the bidirectional tapered thread and may further adopt the nut body 22 produced from a unidirectional tapered thread and other screw threads including a triangular thread, a trapezoidal thread and a zigzagging thread capable of engaging with the tapered taper 1. On the premise that the reliability of a connection technology is guaranteed, the tapered thread connection pair 10 is a closed-loop fastening technical system, that is, 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 will form an independent technical system so as to be capable of guaranteeing the technical effectiveness of a connection technical system without depending on a third-party technology, that is, the effectiveness of the tapered thread connection pair 10 may not be affected even if there is no support from other objects, such a support includes that there is a gap between the tapered thread connection pair 10 and the fastened workpiece 130. In this way, the weight of the equipment will be greatly reduced, invalid loads will be removed, the technical demands of effective loading capacity, brake performance, energy saving and emission reduction on the equipment will be improved, which are thread technical advantages that are not provided by other thread technologies, but are only provided when the tapered thread connection pair 10 of the connection structure of the bolt and the nut of the bidirectional tapered thread is in a relationship of a non-rigid connection or rigid connection with the fastened workpiece 130.

[0085] In the present embodiment, when a gasket is provided between the nut body 21 and the nut body 22, the structure, principle and implementation steps thereof are similar to those of the present embodiment.

[0086] In the present embodiment, when the hexagonal head of the bolt is located at the right side, the nut body 21 and the nut body 22 are both located at the left side of the fastened workpiece 130, and the structure, principle and implementation steps of the hexagonal head of the bolt are similar to those of the present embodiment.

A Fourth Embodiment

[0087] As shown in FIG. 7, FIG. 8 and FIG. 9, the structure, principle and implementation steps of the present embodiment are similar to those of the first embodiment, the second embodiment and the third embodiment, except that, the asymmetric bidirectional tapered thread 1 in the present embodiment has a left taper 95 less than a right taper 96, preferably, a first taper angle 1 is greater than 0 and less than 53, preferably, the first taper angle 1 takes a value in a range from 2 to 40; and preferably, a second taper angle 2 is greater than 0 and less than 53, preferably, the second taper angle 2 takes a value in a range from 2 to 40. For individual special fields, preferably, the second taper angle 2 is greater than or equal to 53 and less than 180, preferably, the second taper angle 2 takes a value in a range from 53 to 90.

A Fifth Embodiment

[0088] As shown in FIG. 10, FIG. 11, FIG. 12 and FIG. 13, the structure, principle and implementation steps of the present embodiment are similar to the first embodiment and the fourth embodiment, except that the screw body 31 on the cylindrical body 3 in the present embodiment includes screw thread structures of asymmetrical bidirectional tapered threads 1 in two olive-like shapes 93, that is, the asymmetrical bidirectional tapered thread 1 of a screw body 31 is an asymmetrical bidirectional tapered external thread 9 in an olive-like shape 93 with two taper structure forms in which a left taper 95 is less than a right taper 96 and the left taper 95 is greater than the right tape 96, wherein a thread section, which is located at the left side of a polish rod 20, that is, a non-thread section, of the screw body 31 is the asymmetrical bidirectional tapered external thread 9 in the olive-like shape 93 in which the left taper 95 is greater than the right tape 96, that is, a thread section, which is in mutual thread fit with a cylindrical body 2, that is, a nut body 21, located at the left side of a workpiece 130, of the external thread 9 is the asymmetrical bidirectional tapered external thread 9 in the olive-like shape 93 in which the left taper 95 is greater than the right tape 96; and a thread section, which is located at the right side of a polish rod 20, that is, a non-thread section, of the screw body 31 is the asymmetrical bidirectional tapered external thread 9 in the olive-like shape 93 in which the left taper 95 is less than the right tape 96, that is, a thread section, which is in mutual thread fit with a cylindrical body 2, that is, a nut body 22, located at the right side of a workpiece 130, of the external thread 9 is the asymmetrical bidirectional tapered external thread 9 in the olive-like shape 93 in which the left taper 95 is less than the right tape 96.

[0089] In the present embodiment, the internal thread, that is, an asymmetrical bidirectional tapered internal thread 6 in an olive-like shape 93 in which a left taper 95 is less than a right taper 96, of a cylindrical body 2, that is, a nut body 21, is located at the left side of the workpiece 130, and an asymmetrical bidirectional tapered internal thread 6 in an olive-like shape 93 in which a left taper 95 is greater than a right taper 96, of a cylindrical body 2, that is, a nut body 22, is located at the right side of the workpiece 130. Accordingly, the asymmetrical bidirectional tapered thread 1 in an olive-like shape of the screw body 31 of the columnar body 3 further includes asymmetrical bidirectional tapered external threads 9 in olive-like shapes 93 of two taper structure forms, that is, includes the asymmetrical bidirectional tapered external thread 9 in the olive-like shape 93 in which the left taper 95 is less than the right taper 96 at the left side of the polish rod 20, that is, a non-thread section, of the screw rod 31 and the asymmetrical bidirectional tapered external thread 9 in the olive-like shape 93 in which the left taper 95 is greater than the right taper 96 at the right side of the polish rod 20, that is, a non-thread section, of the screw rod 31, that is, a thread section at the left side of the screw body 31 in which the external thread 9 and the nut body 21 are in mutual thread fit is the asymmetrical bidirectional tapered external thread 9 in the olive-like shape 93 and the left taper 95 is less than the right taper 96; and a thread section at the right side of the screw body 31 in which the external thread 9 and the nut body 22 are in mutual thread fit is the asymmetrical bidirectional tapered external thread 9 in the olive-like shape 93 and the left taper 95 is greater than the right taper 96.

[0090] The combination of the bolt and the double nuts depends on the application requirement.

[0091] Specific embodiments described herein are exemplary illustrations to the spirit of the present invention. Those skilled in the art to which the present invention pertains may make various modifications or additions to the specific embodiments described or obtain equivalents by using similar alternatives without deviating from the spirit of the present invention or exceeding the scope defined by the appended claims.

[0092] Although terms such as tapered thread 1, cylindrical body 2, nut body 21, nut body 22, columnar body 3, polish rod 20, tapered hole 4, bidirectional tapered hole 41, bidirectional tapered hole conical surface 42, first helical conical surface 421 of the tapered hole, first taper angle 1, second helical conical surface 422 of the tapered hole, second taper angle 2, internal helical line 5, internal thread 6, truncated cone body 7, bidirectional truncated cone body 71, bidirectional truncated cone body conical surface 72, first helical conical surface 721 of truncated cone body, first taper angle 1, second helical conical surface 722 of truncated cone body, second taper angle 2, external helical line 8, external thread 9, olive-like shape 93, left taper 95, right taper 96, leftward distribution 97, rightward distribution 98, connection pair for thread 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, unidirectional tapered body, bidirectional tapered body, cone, internal cone, tapered hole, external cone, cone, cone pair, helical structure, helical movement, thread body, complete unit thread, concentric force, concentric force angle, anti-concentric force, anti-concentric force angle, centripetal force, anti-centripetal force, reverse collinear, internal stress, bidirectional force, unidirectional force, sliding bearing, sliding bearing pair, locking bearing surface 111, locking bearing surface 112, bearing surface 122 of the tapered thread, bearing surface 121 of the tapered thread, non-entity space, material entity, workpiece 130, non-rigid connection, non-rigid material, transmission member, gasket and so on have been widely used in the present invention, other terms can be used alternatively. These terms are only used to better description and illustration of the essence of the present invention. It departs from the spirit of the present invention to deem it as any limitation of the present invention.