CN213744399U - Dumbbell-like symmetrical bidirectional tapered thread bolt and nut connecting structure - Google Patents

Abstract

The utility model belongs to the technical field of equipment is general, a kind of two-way tapered thread's of dumbbell shape symmetry bolt and nut connection structure is related to, the poor scheduling problem of current screw thread self-align and auto-lock nature has been solved, characterized by, internal thread (6) are two-way bell mouth (41) (non-entity space) of tube-shape parent (2) internal surface, external screw thread (9) are two-way frustum of column parent (3) surface (71) (material entity), complete cell cube screw thread all is left side tapering (95) and right side tapering (96) the same and/or is the big class dumbbell shape (94) two-way cone body in the middle of the heliciform that the similar the same is of heliciform, the performance mainly depends on flank of thread and tapering size, the advantage: the inner and outer threads are contained by the cone through the taper hole, a section of cone pair is formed by the bidirectional taper hole (41) and the bidirectional cone frustum (71) to form the thread pair (10), until the inner and outer cones are in spiral conical surface sizing fit or sizing interference to realize the thread connection function.

Description

Dumbbell-like symmetrical bidirectional tapered thread bolt and nut connecting structure

Technical Field

The utility model belongs to the technical field of equipment is general, especially, relate to a kind of two-way taper thread's of dumbbell shape symmetry bolt and nut connection structure (hereinafter referred to as "two-way taper thread's bolt and nut").

Background

The invention of the screw thread has a profound influence on the progress of the human society. The thread is one of the most basic industrial technologies, is not a specific product, is a key common technology of the industry, and the technical performance of the thread needs to be embodied by using the specific product as an application carrier, so that the thread is widely applied in various industries. The existing thread technology has high standardization level, mature technical theory and long-term practical application, and is a fastening thread when used for fastening; the sealing is a sealing thread; the transmission screw is formed by transmission. Thread terminology according to national standards: "thread" means a tooth body with the same tooth type and continuously raised along a spiral line on a cylindrical or conical surface; "dental body" refers to the body of material between adjacent flanks. This is also a globally recognized definition of threads.

Modern threads began in 1841 as uk hui threads. According to the modern thread technical theory, the basic conditions of thread self-locking are as follows: the equivalent friction angle must not be less than the helix angle. The thread is a recognition of the modern thread technology based on the technical principle of the modern thread, namely the inclined plane principle, and becomes an important theoretical basis of the modern thread technology. The first theoretical explanation of the slope principle was steve, who studied the parallelogram law of the equilibrium of the object on the slope and the resultant of forces, he proposed the famous slope law in 1586: the gravity force in the direction of the inclined plane on an object placed on the inclined plane is proportional to the sine of the inclination angle. The inclined plane is a smooth plane inclined with the horizontal plane, the screw is the deformation of the inclined plane, the thread is like the inclined plane wrapped outside the cylinder, the more gentle the inclined plane is, the greater the mechanical benefit is (see figure 7) (Yangshisan, Wang Xiuya, the principle discussion of screws, Gauss arithmetic research).

The 'inclined plane principle' of modern screw thread is an inclined plane sliding block model (see figure 8) established based on an inclined plane law, and people think that under the condition of small static load and temperature change, when a thread lead angle is smaller than or equal to an equivalent friction angle, a screw thread pair has a self-locking condition. The lead angle of the thread (see fig. 9), also known as the lead angle of the thread, is the angle between the tangent to the helix on the pitch diameter cylinder and the plane perpendicular to the axis of the thread, which affects the self-locking and anti-loosening of the thread. The equivalent friction angle is the friction angle corresponding to the final transformation of the different friction forms into the most common bevel slider form. In general, in an inclined plane slider model, when an inclined plane inclines to a certain angle, the friction force of the slider at the moment is just equal to the component of gravity along the inclined plane, the object is just in a stress balance state at the moment, and the inclined plane inclination angle at the moment is called as an equivalent friction angle. The american engineers developed wedge threads in the middle of the last century, the technical principles of which still followed the "ramp principle". The invention of wedge thread is inspired by "wooden wedge". Specifically, the structure of the wedge-shaped thread is that a wedge-shaped inclined plane which forms an included angle of 25-30 degrees with the axis of the thread is arranged at the root of an internal thread (namely a nut thread) of a triangular thread (commonly called a common thread), and the wedge-shaped inclined plane of 30 degrees is adopted in engineering practice. In the prior art, people research and solve the problems of thread loosening prevention and the like from the technical level and the technical direction of thread profile angles, and the wedge thread technology is not exceptional and is a specific application of the wedge technology. However, the existing threads have the problems of low connection strength, weak self-positioning capability, poor self-locking property, small bearing value, poor stability, poor compatibility, poor reusability, high temperature and low temperature and the like, and typically, bolts or nuts applying the modern thread technology generally have the defect of easy loosening, and along with frequent vibration or shock of equipment, the bolts and the nuts are loosened or even fall off, so that safety accidents are seriously easy to happen.

Disclosure of Invention

Any technical theory, with theoretical assumptions background, threads are no exception. Along with the scientific and technological progress, to connecting the more non-static more non-room temperature environment of destruction of having the non-pure linear load, there is the non-linear load of linear load and even the two stack and produce more complicated destruction load condition from this, and the application operating mode is complicated, based on understanding like this, the utility model aims at the above-mentioned problem, provide a reasonable in design, simple structure, have good connection performance, locking performance's two-way taper thread's bolt and nut connection structure.

In order to achieve the above purpose, the utility model adopts the following technical proposal: the bolt and nut connecting structure of the dumbbell-shaped symmetrical bidirectional tapered thread is a threaded connecting pair consisting of a symmetrical bidirectional tapered external thread and a symmetrical bidirectional tapered internal thread, is a special threaded pair technology for synthesizing technical characteristics of a cone pair and a spiral motion, is a threaded technology for synthesizing technical characteristics of a bidirectional cone and a spiral structure, consists of two single-cone bodies, and consists of two single-cone bodies with opposite directions of left-side conicity and right-side conicity and same conicity and/or approximately same conicity in two directions, wherein the bidirectional cone bodies are spirally distributed on the outer surface of a cylindrical parent body to form external threads and/or are spirally distributed on the inner surface of the cylindrical parent body to form internal threads, and the complete unit body thread has the similar type of small middle and large two ends, and the left-side conicity and the right-side conicity are same and/or approximately same, no matter the internal threads and the external threads, the left-side conicity and the right-side conicity are same A special bidirectional cone geometry of dumbbell shape. This kind of bolt and nut connection structure of two-way tapered thread of dumbbell shape symmetry, the two-way tapered thread definition of symmetry, can express as: the special bidirectional tapered geometric body is characterized in that the special bidirectional tapered geometric body is provided with a symmetrical bidirectional tapered hole (or a symmetrical bidirectional conical frustum body) which is provided with a left side taper and a right side taper, has the left side taper and the right side taper in opposite directions or opposite directions, has the same taper and/or is approximately the same taper, and is spirally distributed continuously and/or discontinuously along a spiral line, has a small middle part and large two ends, and is in a dumbbell-like shape. "for manufacturing reasons, the thread head and the thread tail of the symmetrical bidirectional tapered thread may be incomplete bidirectional tapered geometry. Different from the modern thread technology, the thread technology is changed from the original meshing relationship between the internal thread and the external thread of the modern thread to the embracing relationship between the internal thread and the external thread of the bidirectional conical thread.

This bolt and nut of two-way toper screw thread, including being the spiral helicine two-way cone frustum body that distributes in column parent surface and being the spiral helicine two-way bell mouth that distributes in tube-shape parent internal surface, including screw-thread fit's external screw thread and internal thread each other promptly, the internal thread distributes and is spiral helicine two-way bell mouth and exists with "non-entity space" form, the external screw thread distributes and is spiral helicine two-way cone frustum body and exists with "material entity" form, non-entity space refer to the space environment that can hold above-mentioned material entity, the internal thread is the container, the external screw thread is by the container: the internal thread and the external thread are one-section two-way conical geometric bodies which are screwed and sleeved together to be clasped until one-side two-way bearing or left-side right-side two-way bearing or sizing interference fit, whether two-way bearing on two sides is related to the actual working condition of the application field, namely, the two-way conical hole is one-section wrapping and clasping two-way conical frustum body, namely, the internal thread is one-section clasping corresponding external thread.

The screw thread connection pair is a non-tooth thread formed by a conical pair formed by mutually matching a spiral outer conical surface and a spiral inner conical surface, the outer conical surface of an outer conical body of the bidirectional conical thread and the inner conical surface of an inner conical body are both bidirectional conical surfaces, when the screw thread connection pair is formed between the bidirectional conical threads, a junction surface of the inner conical surface and the outer conical surface is taken as a supporting surface, namely the conical surface is taken as the supporting surface, so that the connection technical performance is realized, and the self-locking property, the self-positioning property, the reusability, the fatigue resistance and other capabilities of the screw thread pair mainly depend on the conical surface of the conical pair of the bolt and nut connection structure forming the bidirectional conical thread and the taper size thereof, namely the conical surface of the inner thread and the taper size of the outer thread.

The bolt and the nut of the bidirectional tapered thread have the advantages that the thread body, namely the bidirectional conical body, is distributed on any one side of the left side or the right side, the section of the single conical body is formed by two plain lines of a cone in a bidirectional way through a conical axis, namely the bidirectional state, the plain line is the intersection line of the conical surface and a plane passing through the conical axis, the cone principle of the bolt and nut connecting structure of the bidirectional tapered thread represents an axial force and a counter axial force, the axial force and the counter axial force are synthesized by the bidirectional force, the axial force and the corresponding counter axial force are opposite, the internal thread and the external thread are in a cohesive relation, namely, a thread pair is formed by utilizing the internal thread to clasp the external thread, namely a cone (outer cone) corresponding to a cone (cohesive) to a cohesive sizing matching to realize self-positioning or self-locking until the cohesive sizing interference contact is realized, the inner cone and the outer cone are radially locked or self-positioned together through the radial locking of the taper hole and the cone frustum body, so that the self-locking or self-positioning of the thread pair is realized, and the thread connection pair formed by the internal thread and the external thread of the non-traditional thread is realized through mutual abutting between the tooth body and the tooth body to realize the thread connection performance.

When the internal cone and the external cone form a cone pair, the internal conical surface of the internal cone embraces the external conical surface of the external cone, and the internal conical surface is in close contact with the external conical surface. The internal cone axial force and the external cone reverse axial force are the unique force concepts of the bidirectional tapered thread technology, namely the conical pair technology.

The inner cone body is in a shape similar to a shaft sleeve, under the action of an external load, the inner cone body generates an axial force pointing to or pressing against a cone axis, the axial force is formed by a pair of centripetal forces which are distributed in a mirror-image manner by taking the cone axis as a center and are respectively vertical to two elementary lines of the cone body in a bidirectional synthesis manner, namely the axial force is formed by two centripetal forces which are distributed on two sides of the cone axis in a mirror-image manner by taking the cone axis as the center and are respectively vertical to two elementary lines of the cone body and point to or press against a common point of the cone axis through the cone axis cross section, when the cone body and the spiral structure are synthesized into a thread and are applied to a thread pair, the axial force is formed by two centripetal forces which are distributed in a mirror-image manner and/or approximate mirror-image manner on two sides of the thread axis and are respectively vertical to two elementary lines of the cone body and point to or press against the common point of the thread axis and/or approximate common point through the thread axis cross section, the axial force is densely and numb distributed on the conical axis and/or the thread axis in an axial and circumferential mode, the axial force is corresponding to an axial force angle, an included angle of two centripetal forces forming the axial force forms the axial force angle, and the size of the axial force angle depends on the taper size of the cone, namely the size of the taper angle.

The external cone body exists in a form similar to a shaft and has strong capacity of absorbing various external loads, the external cone body generates a counter axial force which is opposite to each axial force of the internal cone body, the counter axial force is bidirectionally synthesized by a pair of counter axial forces which are distributed in a mirror image way by taking the cone axis as the center and are respectively vertical to two prime lines of the cone body, namely the cross section of the counter axial force passing through the cone axis is composed of two counter axial forces which are distributed in a mirror image way by taking the cone axis as the center on two sides of the cone axis and are respectively vertical to the two prime lines of the cone body and point or press to the internal cone surface by the common point of the cone axis, and when the cone body and the spiral structure are synthesized into a thread and are applied to a thread pair, the cross section of the counter axial force passing through the thread axis is formed by a thread which is distributed in a mirror image way and/or approximately in a two way by taking the thread axis as the center and point and/or approximately common point of the thread axis points or point or point of the common point or the mirror image of the thread axis The anti-axial force angle is formed by the included angle of the two anti-axial forces forming the anti-axial force, and the magnitude of the anti-axial force angle depends on the taper magnitude of the cone, namely the magnitude of the taper angle. The axial force and the counter axial force are generated when the inner cone and the outer cone of the cone pair are in effective contact, namely, a pair of corresponding and opposite axial force and counter axial force always exist in the effective contact process of the inner cone and the outer cone of the cone pair, the axial force and the counter axial force are both bidirectional force and non-unidirectional force which are centered on the cone axis and/or the thread axis and distributed in a mirror image bidirectional way, the cone axis and the thread axis are coincident axes, namely the same axis and/or approximate same axis, the counter axial force and the axial force are in reverse collinearity, when the cones and the spiral structure are synthesized into threads and form the thread pair, the threads are in reverse collinearity and/or approximate reverse collinearity, the axial force and the counter axial force generate pressure on the contact surface of the inner cone surface and the outer cone surface until interference, and the axial force and the counter axial force are densely and the contact surface uniformly distributed on the surface of the inner cone surface and the outer cone surface in the circumferential direction, when the cohesion motion of the inner cone and the outer cone is carried out until the cone pair reaches the pressure generated by interference fit, the inner cone and the outer cone are combined together, namely the pressure can already enable the inner cone to cohere with the outer cone to form a similar integral structure, and after the external force facilitated by the pressure disappears, the inner cone and the outer cone cannot be separated from each other under the action of gravity due to the random change of the body position of the similar integral structure, the cone pair is self-locked, namely the thread pair is self-locked, the self-locking performance has a certain resistance effect on other external loads which can cause the inner cone and the outer cone to be separated from each other except for gravity, the cone pair also has the self-positioning performance of the mutual fit of the inner cone and the outer cone, but the cone by-product can be self-locked and self-positioned without any axial force angle and/or counter axial force angle.

When the axial force angle and/or the anti-axial force angle are smaller than 180 degrees and larger than 127 degrees, the conical pair has self-locking performance, when the axial force angle and/or the anti-axial force angle are infinitely close to 180 degrees, the self-locking performance of the conical pair is best, the axial bearing capacity of the conical pair is weakest, the axial force angle and/or the anti-axial force angle are equal to or smaller than 127 degrees and larger than 0 degrees, the conical pair is located in a region with weak self-locking performance and/or no self-locking performance, the axial force angle and/or the anti-axial force angle tend to change towards the direction infinitely close to 0 degrees, the self-locking performance of the conical pair changes in the direction of attenuation trend until the self-locking performance is completely unavailable, and the axial bearing capacity changes in the direction of enhancement trend until the axial bearing capacity is strongest.

When the axial force angle and/or the anti-axial force angle are less than 180 degrees and more than 127 degrees, the conical pair is in a strong self-positioning state, strong self-positioning of the inner and outer cones is easily achieved, when the axial force angle and/or the anti-axial force angle are infinitely close to 180 degrees, the self-positioning capability of the inner and outer cones of the conical pair is strongest, the axial force angle and/or the anti-axial force angle are equal to or less than 127 degrees and more than 0 degrees, the conical pair is in a weak self-positioning state, the axial force angle and/or the anti-axial force angle tend to change towards the direction infinitely close to 0 degrees, and the self-positioning capability of the inner and outer cones of the conical pair changes in the direction of attenuation trend until the inner and outer cones completely do not have the self-positioning capability.

Compared with the contained and contained relation that the single-cone unidirectional tapered thread of the single cone can only bear the load of the single side of the conical surface, the contained relation of the irreversible single-side bidirectional contained relation is realized, the reversible left and right bidirectional contained relation of the bidirectional tapered thread of the double cone can realize the respective bearing of the left side of the conical surface and/or the right side of the conical surface and/or the bidirectional simultaneous bearing of the right side of the left side of the conical surface, the disordered freedom degree between the conical hole and the cone frustum is further limited, the screw motion can ensure that the bolt and nut connecting structure of the bidirectional tapered thread obtains the necessary ordered freedom degree, and the technical characteristics of the conical pair and the thread pair are effectively synthesized to form a brand new thread technology.

When the bolt and the nut with the bidirectional conical threads are used, the conical surface of the bidirectional conical frustum of the external threads of the bidirectional conical threads is matched with the conical surface of the bidirectional conical hole of the internal threads of the bidirectional conical threads.

The two-way cone, namely the cone frustum and/or the cone hole, of the cone pair of the bolt and nut connecting structure forming the dumbbell-like symmetrical two-way tapered thread can realize self-locking and/or self-positioning of the threaded connecting pair without any taper or any taper angle, the inner cone and the outer cone of the two-way cone have certain taper or certain taper angle, the bolt and nut connecting structure of the two-way tapered thread has self-locking and self-positioning performance, the taper comprises the left taper and the right taper of the inner thread body and the outer thread body, the taper angle comprises the left taper angle and the right taper angle of the inner thread body and the outer thread body, the left taper corresponds to the left taper angle, namely a first taper angle alpha 1, preferably, the first taper angle alpha 1 is more than 0 degrees and less than 53 degrees, preferably, the first taper angle alpha 1 is 2-40 degrees, the right taper corresponds to the right taper angle, namely a second taper angle alpha 2, preferably, the second taper angle α 2 is 0 ° < 53 °, preferably, the value of the second taper angle α 2 is 2 ° to 40 °, in particular, the first taper angle α 1 is 53 ° ≦ 180 °, the second taper angle α 2 is 53 ° ≦ 180 °, preferably, the first taper angle α 1 is 53 ° ≦ 90 °, and the second taper angle α 2 is 53 ° ≦ 90 °.

The special fields mentioned above refer to the application fields of screw connection such as transmission connection with low or even no self-locking requirement and/or weak self-positioning requirement and/or high axial bearing capacity requirement and/or necessary anti-lock measures.

The bolt and the nut with the bidirectional conical threads are characterized in that the cylindrical parent body is provided with a bolt body, the outer surface of the bolt body is provided with circular truncated cones which are distributed spirally, the circular truncated cones comprise symmetrical bidirectional circular truncated cones, the cylindrical parent body can be solid or hollow and comprises a cylinder, a non-cylinder surface and other non-cylinder surface geometric shapes which need to be processed with threads on the outer surface of the cylindrical parent body and/or the non-cylinder body and other workpieces and objects, and the outer surface comprises a cylinder surface, a conical surface and other non-cylinder surface geometric shapes.

The bolt and the nut with the bidirectional tapered threads are characterized in that the two same conical frustum bodies are symmetrically arranged on the upper top surfaces and are oppositely jointed with each other in a spiral way to form threads, the lower bottom surfaces of the two same conical frustum bodies are positioned at the two ends of the bidirectional conical frustum bodies, and the threads are formed when dumbbell-shaped symmetrical bidirectional tapered threads are formed, the threads are respectively jointed with the lower bottom surfaces of the adjacent bidirectional conical frustum bodies, and/or the threads are formed by being respectively jointed with the lower bottom surfaces of the adjacent bidirectional conical frustum bodies in a spiral way, the external threads comprise a first spiral conical surface of the conical frustum body, namely a left conical surface, a right conical surface of the conical frustum body, and an external spiral line, in the section passing through the axis of the threads, the complete single-section symmetrical bidirectional tapered external threads are special bidirectional tapered geometric bodies which are small in the middle, large at the two ends, same as the left conical degree and the right conical degree and/or similar to the same as the right conical degree, the symmetrical bidirectional cone frustum comprises a bidirectional cone frustum conical surface, wherein the included angle between two element lines of the left conical surface, namely a first spiral conical surface of the cone frustum is a first cone angle alpha 1, the first spiral conical surface of the cone frustum forms a left conical degree and is distributed in the right direction, the left conical degree corresponds to the first cone angle alpha 1, the included angle between two element lines of the right conical surface, namely a second spiral conical surface of the cone frustum is a second cone angle alpha 2, the second spiral conical surface of the cone frustum forms a right conical degree and is distributed in the left direction, the right conical degree corresponds to the second cone angle alpha 2, the conical directions corresponding to the first cone angle alpha 1 and the second cone angle alpha 2 are opposite, the element lines are intersection lines of the conical surface and a plane passing through a cone axis, and the shape formed by the first spiral conical surface of the central axis of the cone frustum of the bidirectional cone frustum and the second spiral conical surface of the cone frustum is symmetrical and opposite to the two right trapezoid which are the same as the bottom edge of the columnar parent body The right-angle sides of the joined right-angle trapezoidal combination bodies are circumferentially and uniformly rotated around the rotation center, the right-angle trapezoidal combination bodies axially move along the central axis of the columnar matrix at a uniform speed simultaneously, the spiral outer side surfaces of the rotary bodies formed by the two inclined sides of the right-angle trapezoidal combination bodies are identical in shape, the right-angle trapezoidal combination bodies are special geometric bodies, the upper bottom sides of the two identical right-angle trapezoidal combination bodies are symmetrically and oppositely joined, and the lower bottom sides of the two identical right-angle trapezoidal combination bodies are respectively positioned at the two ends of the right-angle trapezoidal combination bodies.

The bolt and the nut with the bidirectional conical threads are characterized in that the cylindrical parent body is provided with a nut body, the inner surface of the nut body is provided with conical holes which are distributed spirally, the conical holes comprise symmetrical bidirectional conical holes, the cylindrical parent body comprises a cylinder body and/or a non-cylinder body and other workpieces and objects which need to be processed with the internal threads on the inner surface, and the inner surface comprises the geometric shapes of the inner surfaces such as non-cylindrical surfaces such as cylindrical surfaces and conical surfaces. The bolt and the nut of the bidirectional tapered thread are characterized in that the upper top surfaces of two same tapered holes are symmetrical and are mutually jointed in opposite directions to form a spiral thread, the lower bottom surfaces of the two same tapered holes are positioned at two ends of the bidirectional tapered hole, and the two same tapered holes are mutually jointed with the lower bottom surfaces of the two adjacent bidirectional tapered holes respectively when the dumbbell-shaped symmetrical bidirectional tapered thread is formed, and/or the two same tapered holes are mutually jointed with the lower bottom surfaces of the two adjacent bidirectional tapered holes respectively to form a spiral thread, the internal thread comprises a first spiral conical surface of the tapered holes, namely a left conical surface, and a second spiral conical surface of the tapered holes, namely a right conical surface and an internal spiral line, in a section passing through the axis of the thread, the complete single-section symmetrical bidirectional tapered internal thread is a special bidirectional tapered geometric body which is small in the middle, large in two ends, identical in left-side taper and right-side taper and/or approximately identical in left-side taper, the bidirectional tapered hole comprises a bidirectional tapered hole conical surface, the left conical surface of the bidirectional tapered hole conical surface, namely two plain lines of a first spiral conical surface of the tapered hole, form a first taper angle alpha 1, the first spiral conical surface of the tapered hole forms a left taper and is distributed in the right direction, the left taper corresponds to the first taper angle alpha 1, the right conical surface of the bidirectional tapered hole, namely two plain lines of a second spiral conical surface of the tapered hole, form a right taper and is distributed in the left direction, the right taper corresponds to the second taper angle alpha 2, the taper directions corresponding to the first taper angle alpha 1 and the second taper angle alpha 2 are opposite, the plain lines are intersection lines of a conical surface and a plane passing through a conical axis, the shape formed by the first spiral conical surface of the bidirectional tapered hole and the second spiral conical surface of a central axis hole is symmetrical and oppositely jointed with the upper bottom edges of two right-angle trapezoids which are identical and are superposed on the cylindrical parent body The right-angle sides of the combination body are circumferentially and uniformly rotated around the rotation center, the right-angle trapezoidal combination body simultaneously moves axially at a uniform speed along the central axis of the cylindrical parent body, the spiral outer side surfaces of the rotary body formed by the two inclined sides of the right-angle trapezoidal combination body are identical in shape, the right-angle trapezoidal combination body is a special geometric body, the upper bottom sides of the two identical right-angle trapezoids are symmetrically and oppositely jointed, and the lower bottom sides of the two identical right-angle trapezoids are respectively positioned at the two ends of the right-angle trapezoidal combination body.

When the connecting structure of the bolt and the nut with the bidirectional conical threads works, the relation between the connecting structure and a workpiece comprises rigid connection and non-rigid connection. The rigid connection refers to a nut bearing surface and a workpiece bearing surface which are bearing surfaces, and comprises a single nut, a double nut and other structural forms, the non-rigid connection refers to two nuts with opposite side end surfaces bearing surfaces and/or two nuts with a gasket between the opposite side end surfaces, and the two nuts are indirectly bearing surfaces, and is mainly applied to non-rigid connection workpieces such as non-rigid materials or transmission parts or application fields such as requirements and the like needing to be met through double nut installation, the workpieces refer to connected objects including the workpieces, and the gasket refers to a spacer including the gasket.

The bolt and nut connecting structure with bidirectional conical threads adopts a bolt and double nut connecting structure, when the relation between the bolt and a fastened workpiece is rigid connection, the thread working bearing surfaces are different, when a cylindrical parent body is positioned on the left side of the fastened workpiece, namely the left side end surface of the fastened workpiece, and the right side end surface of the cylindrical parent body, namely a left side nut body is the locking bearing surface of the fastened workpiece, the left side spiral conical surface of a bidirectional conical thread of a left side nut body and a cylindrical parent body, namely a bolt body, namely a conical hole first spiral conical surface and a conical frustum first spiral conical surface are conical thread bearing surfaces, and the conical hole first spiral conical surface and the conical frustum first spiral conical surface are mutually bearing surfaces, when the cylindrical parent body is positioned on the right side of the fastened workpiece, namely the right side end surface of the fastened workpiece, and the cylindrical parent body, namely the left side end surface of a right side nut body is the locking bearing surface of the fastened workpiece, the right nut body and the columnar parent body, namely the screw body, namely the bolt, namely the right spiral conical surface of the bidirectional conical thread of the bolt, namely the second spiral conical surface of the conical hole and the second spiral conical surface of the cone frustum body are conical thread bearing surfaces, and the second spiral conical surface of the conical hole and the second spiral conical surface of the cone frustum body are mutually bearing surfaces.

When the bolt and the nut with the bidirectional conical threads adopt a bolt and single nut connecting structure and are rigidly connected with a fastened workpiece, when the hexagonal head of the bolt is positioned on the left side, the cylindrical parent body, namely the nut body, namely the single nut is positioned on the right side of the fastened workpiece, when the bolt and single nut connecting structure works, the right end surface of the workpiece and the left end surface of the nut body are locking and supporting surfaces of the nut body and the fastened workpiece, the nut body and the cylindrical parent body, namely the bolt body, namely the right spiral conical surface of the bidirectional conical threads of the bolt, namely the second spiral conical surface of the conical hole and the second spiral conical surface of the cone frustum are conical thread supporting surfaces, and the second spiral conical surface of the conical hole and the second spiral conical surface of the cone frustum are supporting surfaces mutually; when the hexagonal head of the bolt is positioned on the right side, the cylindrical parent body, namely the nut body, namely the single nut is positioned on the left side of the fastened workpiece, when the bolt and single nut connecting structure works, the left side end face of the workpiece and the right side end face of the nut body are locking and supporting faces of the nut body and the fastened workpiece, the nut body and the cylindrical parent body, namely the bolt body, namely the left side spiral conical face of the bidirectional conical thread of the bolt, namely the first spiral conical face of the tapered hole and the first spiral conical face of the truncated cone body are conical thread supporting faces, and the first spiral conical face of the tapered hole and the first spiral conical face of the truncated cone body are mutually supporting faces.

The bolt and nut with bidirectional conical threads adopts a bolt and double-nut connecting structure, when the bolt and the double-nut connecting structure are in non-rigid connection with a fastened workpiece, the thread working bearing surfaces, namely conical thread bearing surfaces, are different, the cylindrical parent body comprises a left nut body and a right nut body, the right end surface of the left nut body is in direct contact with the left end surface of the right nut body in opposite directions and is a locking bearing surface, when the right end surface of the left nut body is a locking bearing surface, the left spiral conical surface, namely a conical hole first spiral conical surface and a conical frustum first spiral conical surface of the bidirectional conical threads of the bolt, namely the left nut body and the cylindrical parent body, namely the bolt, are conical thread bearing surfaces, the conical hole first spiral conical surface and the conical frustum first spiral conical surface are bearing surfaces, when the left end surface of the right nut body is a locking bearing surface, the right spiral conical surface, namely the right spiral conical surface and the cylindrical parent body, namely the right spiral conical surface of the bidirectional conical threads of the bolt body, namely the right nut body are conical surfaces The second spiral conical surface of the hole and the second spiral conical surface of the truncated cone body are conical thread bearing surfaces, and the second spiral conical surface of the conical hole and the second spiral conical surface of the truncated cone body are bearing surfaces.

The bolt and the nut of the bidirectional tapered thread adopt a bolt and double nut connecting structure, when the relation between the bolt and a fastened workpiece is non-rigid connection, thread working bearing surfaces, namely tapered thread bearing surfaces, are different, a cylindrical parent body comprises a left nut body and a right nut body, a spacer such as a gasket is arranged between the two cylindrical parent bodies, namely the left nut body and the right nut body, a right end surface of the left nut body and a left end surface of the right nut body are in opposite indirect contact through the gasket to be indirectly locking bearing surfaces, when the cylindrical parent bodies are positioned on the left side of the gasket, namely the left side surface of the gasket, and the right end surface of the left nut body is the locking bearing surface of the left nut body, a left spiral conical surface, namely a first spiral conical surface of a tapered hole and a first spiral conical surface of a conical frustum are tapered thread bearing surfaces, and the first spiral conical surface of the tapered hole and the first spiral conical surface of the conical frustum are mutually tapered conical surfaces When the cylindrical parent body is positioned at the right side of the gasket, namely the right side surface of the gasket, and the left side end surface of the right nut body is the locking support surface of the right nut body, the right spiral conical surface of the bidirectional conical thread of the right nut body and the cylindrical parent body, namely the bolt body, namely the tapered hole second spiral conical surface and the conical frustum second spiral conical surface are conical thread support surfaces, and the tapered hole second spiral conical surface and the conical frustum second spiral conical surface are mutually support surfaces.

The bolt and the nut with the bidirectional conical threads adopt a bolt and double-nut connecting structure, when the relation between the bolt and a fastened workpiece is non-rigid connection, when a cylindrical parent body positioned on the inner side, namely a nut body adjacent to the fastened workpiece, is effectively combined with a cylindrical parent body, namely a screw body, namely a bolt, namely an inner thread and an outer thread which form a conical thread connecting pair are effectively embraced together, the cylindrical parent body positioned on the outer side, namely the nut body which is not adjacent to the fastened workpiece, can be kept in an original state and/or disassembled according to the application working condition, and only one nut is left (for example, the application fields of light weight of equipment or double nuts are not needed to ensure the reliability of the connecting technology and the like), the disassembled nut body is not used as a connecting nut but only used as an installation process nut, and the inner thread of the installation process nut is manufactured by adopting the bidirectional conical threads, the nut body can also be manufactured by adopting one-way tapered threads and other threads which can be screwed with the tapered threads, namely the threads of non-tapered threads such as triangular threads, trapezoidal threads, saw-tooth threads and the like, so as to ensure the reliability of the connection technology, the tapered threaded connection pair is a closed-loop fastening technical system, namely the tapered threaded connection pair can be an independent technical system after the internal threads and the external threads of the tapered threaded connection pair are effectively clasped together without depending on the technical compensation of the three parts to ensure the technical effectiveness of the connection technical system, namely the effectiveness of the tapered threaded connection pair cannot be influenced even if no other objects are supported, including a gap between the tapered threaded connection pair and a fastened workpiece, so that the nut body is favorable for greatly reducing the weight of equipment, removing the ineffective load, and improving the effective load capacity, the braking performance, energy conservation, emission reduction and other technical requirements, this is a thread technical advantage which is unique to the tapered thread connection pair of the present bi-directional tapered thread bolt-and-nut connection structure and the fastened workpiece, regardless of whether the connection is non-rigid or rigid, but which is not possessed by other thread techniques.

The bolt and the nut of the bidirectional tapered thread are in transmission connection, the bidirectional bearing is realized by screwing and connecting the bidirectional tapered hole of the bidirectional tapered internal thread and the bidirectional tapered frustum of the bidirectional tapered external thread, when the external thread and the internal thread form a thread pair, clearance must be reserved between the internal thread and the external thread, namely clearance must be reserved between the bidirectional tapered external thread bidirectional frustum of the bidirectional tapered external thread and the bidirectional tapered internal thread bidirectional tapered hole, if oil and other media are lubricated between the internal thread and the external thread, a bearing oil film is easy to form, and the clearance is favorable for forming the bearing oil film. The number of the formed sliding bearings is adjusted according to the application working condition, namely the bidirectional conical internal threads and the bidirectional conical external threads are effectively and bidirectionally jointed, namely the number of the contained and contained thread joints which are effectively and bidirectionally contacted and clasped, according to the design of the application working condition, the bidirectional conical external thread cone body is bidirectionally contained through the bidirectional conical internal thread cone hole, and the radial, axial, angular, circumferential and other multidirectional positioning is realized, preferably, the bidirectional cone body is contained through the bidirectional conical hole, the radial and circumferential main positioning is assisted by the axial and angular auxiliary positioning, so that the multidirectional positioning of an inner cone and an outer cone is formed until the bidirectional conical hole cone surface clasps with the bidirectional cone body cone surface to realize self-positioning or self-locking is generated until the sizing interference contact is realized, a special synthesis technology of a cone pair and a thread pair is formed, and the precision of the transmission connection of a conical thread technology, especially a bolt and nut connecting structure of the bidirectional conical threads is ensured, Efficiency and reliability.

The bolt and the nut of the bidirectional conical thread are connected in a fastening way and a sealing way, and the technical performances of connection, locking, looseness prevention, bearing, fatigue, sealing and the like are realized through the screwing connection of the bidirectional conical hole and the bidirectional conical frustum, namely, the sizing of the first spiral conical surface of the conical frustum and the first spiral conical surface of the conical hole is realized until interference and/or the sizing of the second spiral conical surface of the conical frustum and the second spiral conical surface of the conical hole is realized until interference, and according to the application working condition, one-direction bearing and/or two-direction simultaneous bearing are realized, namely, the inner cone and the outer cone are centered under the guide of a spiral line of the bidirectional conical frustum and the bidirectional conical hole until the first spiral conical surface of the conical hole and the first spiral conical surface of the conical frustum are clasped to achieve one-direction bearing or two-direction simultaneous bearing and sizing fit or until sizing contact is realized and/or the second spiral conical surface of the conical hole and the second spiral conical frustum are in interference fit The circular conical surface is clasped to achieve one-direction bearing or two-direction bearing sizing matching or until the sizing interference contact, i.e. self-locking and multi-directional positioning in radial, axial, angular, circumferential direction, etc., of the bi-directional outer cone contained by the bi-directional inner cone, preferably, the bidirectional conical frustum is contained by the bidirectional conical hole, and the radial and circumferential main positioning is assisted by the axial and angular auxiliary positioning to further form the multidirectional positioning of the inner cone and the outer cone until the conical surface of the bidirectional conical hole is embraced with the conical surface of the bidirectional conical frustum to realize self-positioning or until the sizing interference contact generates self-locking, so that a special synthesis technology of a conical pair and a thread pair is formed, the efficiency and the reliability of a conical thread technology, particularly a bolt and nut connecting structure of the bidirectional conical thread, are ensured, therefore, the technical performances of mechanical mechanism connection performance, locking performance, anti-loosening performance, bearing performance, sealing performance and the like are realized.

Therefore, the technical performances of the bolt and the nut with the bidirectional tapered threads, such as high transmission precision efficiency, high bearing capacity, high self-locking force, high anti-loosening capacity, high sealing performance and the like, are related to the sizes of the first spiral conical surface of the cone frustum, the left side conical degree formed by the first spiral conical surface, namely the first cone angle alpha 1, the second spiral conical surface of the cone frustum, the right side conical degree formed by the second spiral conical surface of the cone frustum, namely the second cone angle alpha 2, the first spiral conical surface of the tapered hole, the left side conical degree formed by the first spiral conical surface of the tapered hole, namely the first cone angle alpha 1, the second spiral conical surface of the tapered hole, and the right side conical degree formed by the second spiral conical surface, namely the second cone angle alpha 2. The material friction coefficient, the processing quality and the application working condition of the columnar matrix and the cylindrical matrix also have certain influence on the conical matching.

When the right-trapezoid combination body rotates at a constant speed for one circle, the axial movement distance of the right-trapezoid combination body is at least one time of the length of the sum of the right-angle sides of two same right-trapezoid. The structure ensures that the first spiral conical surface of the truncated cone body, the second spiral conical surface of the truncated cone body, the first spiral conical surface of the tapered hole and the second spiral conical surface of the tapered hole have enough length, thereby ensuring that the bidirectional conical surface of the truncated cone body has enough effective contact area and strength and the efficiency required by spiral motion when being matched with the bidirectional conical surface of the tapered hole.

When the right-angled trapezoid combination body rotates at a constant speed for one circle, the axial movement distance of the right-angled trapezoid combination body is equal to the sum of the right-angled sides of two identical right-angled trapezoids. The structure ensures that the first spiral conical surface of the truncated cone body, the second spiral conical surface of the truncated cone body, the first spiral conical surface of the tapered hole and the second spiral conical surface of the tapered hole have enough length, thereby ensuring that the bidirectional conical surface of the truncated cone body has enough effective contact area and strength and the efficiency required by spiral motion when being matched with the bidirectional conical surface of the tapered hole.

In the bolt and the nut with the bidirectional tapered threads, the first spiral conical surface of the truncated cone body and the second spiral conical surface of the truncated cone body are both continuous helicoids or non-continuous helicoids; the first spiral conical surface of the tapered hole and the second spiral conical surface of the tapered hole are both continuous helical surfaces or non-continuous helical surfaces.

In the bolt and the nut with the bidirectional conical threads, one end and/or two ends of the columnar parent body can be screwed into the screwing-in end of the connecting hole of the columnar parent body.

In the bolt and the nut with the bidirectional conical threads, one end of the columnar parent body is provided with a head part with a size larger than the outer diameter of the columnar parent body and/or one end and/or two ends of the columnar parent body are/is provided with a head part with a small diameter smaller than the bidirectional conical outer threads of the bolt body of the columnar parent body, and the connecting hole is a threaded hole arranged on the nut. The connecting hole is arranged in a nut, and the nut refers to an object including the nut and having a threaded structure on the inner surface of the cylindrical parent body.

Compared with the prior art, the bolt and nut connecting structure with the bidirectional conical threads has the advantages that: reasonable in design, simple structure, the circular cone pair that forms through the coaxial internal and external diameter centering of interior, outer circular cone bears or the sizing realizes fastening and connection function until interference fit in two-way, convenient operation, and locking force is big, and the load value is big, and locking performance is good, and transmission efficiency and precision are high, and mechanical seal is effectual, and stability is good, appear the pine when preventing to connect and take off the phenomenon, have auto-lock and self-align function.

Drawings

Fig. 1 is a schematic view of a connection structure of a bolt and two nuts with dumbbell-like symmetrical bidirectional tapered threads according to a first embodiment of the present invention.

Fig. 2 is a schematic view of a screw bolt with dumbbell-like symmetrical bidirectional tapered threads and external threads and a threaded structure of an external thread complete unit body according to the first embodiment of the present invention.

Fig. 3 is a schematic view of a nut body with internal threads and a thread structure of an internal thread complete unit body of a dumbbell-like symmetrical bidirectional tapered thread according to a first embodiment of the present invention.

Fig. 4 is a schematic view of a connection structure of a bolt and a single nut with dumbbell-like symmetrical bidirectional tapered threads according to the second embodiment of the present invention.

Fig. 5 is a schematic view of a connection structure between a bolt and two nuts of the dumbbell-like symmetrical bidirectional tapered threads according to the third embodiment of the present invention.

Fig. 6 is a schematic view of a connection structure between a bolt and a double nut (with a spacer such as a gasket in the middle) of a dumbbell-like symmetrical bidirectional tapered thread according to a fourth embodiment of the present invention.

Fig. 7 is a diagram of "the prior art thread is a bevel on a cylindrical or conical surface" as referred to in the background of the invention.

FIG. 8 is a diagram of a "inclined plane slide block model based on the inclined plane principle, which is a principle of the prior art thread technique" related to the background of the present invention.

Fig. 9 is a view of "lead angle of prior art thread" related to the background of the invention.

In the drawing, a tapered thread 1, a cylindrical parent body 2, a first nut body 21, a second nut body 22, a cylindrical parent body 3, a screw body 31, a tapered bore 4, a bidirectional tapered bore 41, a bidirectional tapered bore conical surface 42, a tapered bore first helical conical surface 421, a first taper angle α 1, a tapered bore second helical conical surface 422, a second taper angle α 2, an internal thread 5, an internal thread 6, a truncated cone 7, a bidirectional truncated cone 71, a bidirectional truncated cone conical surface 72, a truncated cone first helical conical surface 721, a first taper angle α 1, a truncated cone second helical conical surface 722, a second taper angle α 2, an external thread 8, an external thread 9, a dumbbell 94, a left side taper 95, a right side taper 96, a left side distribution 97, a right side distribution 98, a thread connection pair and/or thread pair 10, a play 101, a lock support surface 111, a lock support surface 112, a tapered thread support surface 122, a left side taper 95, a right side taper 96, a play 96, a left side taper 96, a left side distribution 97, a right side distribution 98, a play 101, a lock support surface 112, a tapered thread support surface 122, a tapered thread support surface, and a tapered thread support surface, a, A tapered thread bearing surface 121, a workpiece 130, a nut body locking direction 131, a washer 132, a conical axis 01, a thread axis 02, a slider a on a ramp body, a ramp body B, a gravity G, a gravity along ramp component G1, a friction force F, a thread lead angle phi, an equivalent friction angle P, a conventional external thread major diameter d, a conventional external thread minor diameter d1, and a conventional external thread minor diameter d 2.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

Example one

As shown in fig. 1, fig. 2, and fig. 3, the present embodiment adopts a bolt and double nut connection structure, and the tapered thread connection pair 10 of the bolt and nut connection structure with bidirectional tapered threads includes a bidirectional frustum 71 spirally distributed on the outer surface of the cylindrical parent body 3 and a bidirectional tapered hole 41 spirally distributed on the inner surface of the cylindrical parent body 2, that is, includes an external thread 9 and an internal thread 6 which are in thread fit with each other, the internal thread 6 is distributed with the bidirectional tapered hole 41 spirally and exists in a "non-solid space" form, the external thread 9 is distributed with the bidirectional frustum 71 spirally and exists in a "material solid" form, the internal thread 6 and the external thread 9 are in a relationship between an accommodating member and an accommodated member: the internal thread 6 and the external thread 9 are a section of bidirectional conical geometric body which is screwed, sleeved and clasped together until interference fit, namely, the bidirectional conical hole 41 contains the bidirectional conical frustum 71 section by section, the bidirectional containing limits the disordered freedom degree between the conical hole 4 and the conical frustum 7, the screw motion enables the conical thread connection pair 10 of the bolt and the nut of the bidirectional conical thread to obtain the necessary ordered freedom degree, and the technical characteristics of the conical pair and the thread pair are effectively synthesized.

When the tapered thread connection pair 10 of the bidirectional tapered thread bolt and nut is used, the bidirectional conical frustum conical surface 72 is matched with the bidirectional tapered hole conical surface 42.

The cone frustum body 7 and/or the cone hole 4 of the cone thread connection pair 10 of the bolt and the nut forming the bidirectional cone thread reach a certain taper, namely the cone forming the cone pair reaches a certain taper angle, the cone thread connection pair 10 has self-locking and self-positioning properties, the taper comprises a left side taper 95 and a right side taper 96, the taper angle comprises a left side taper angle and a right side taper angle, the left side taper 95 corresponds to the left side taper angle, namely a first taper angle alpha 1, preferably, the first taper angle alpha 1 is more than 0 degree and less than 53 degrees, and preferably, the first taper angle alpha 1 is 2-40 degrees; the right taper 96 corresponds to a right taper angle, namely a second taper angle alpha 2, preferably, the second taper angle alpha 2 is larger than 0 degrees and smaller than 53 degrees, and preferably, the second taper angle alpha 2 is 2-40 degrees. In particular, in the case of special areas of application of the drive connection, in which self-locking and/or positioning requirements are not or are not required and/or anti-locking measures have to be provided, the first taper angle α 1 of 53 ° or less is preferably less than 180 ° and the second taper angle α 2 of 53 ° or less is preferably less than 180 °.

The external thread 9 is arranged on the outer surface of the columnar parent body 3, and is characterized in that the columnar parent body 3 is provided with a screw body 31, the outer surface of the screw body 31 is provided with truncated cone bodies 7 which are distributed spirally, each truncated cone body 7 comprises a symmetrical bidirectional truncated cone body 71, each symmetrical bidirectional truncated cone body 71 is a special bidirectional tapered geometric body which is shaped like a dumbbell 94, the columnar parent body 3 can be solid or hollow, and comprises a cylinder, a cone, a pipe body and other workpieces and objects which need to be provided with external threads on the outer surface.

The symmetrical two-way frustum cone 71 in the dumbbell-like 94 shape is characterized in that the symmetrical two-way frustum cone 71 is formed by symmetrically and oppositely jointing the upper top surfaces of two identical frustum cones, the lower bottom surfaces of the two identical frustum cones are positioned at the two ends of the two-way frustum cone 71, when the symmetrical two-way conical thread 1 in the dumbbell-like 94 shape is formed, the symmetrical two-way frustum cone 72 is respectively jointed with the lower bottom surfaces of the two adjacent frustum cones 71, and/or is respectively jointed with the lower bottom surfaces of the two adjacent frustum cones 71, the outer surface of the frustum cone 7 is provided with the symmetrical two-way frustum cone 72, the external thread 9 comprises a first spiral cone 721 of the frustum cone, namely a left side cone, and a second spiral cone 722 of the frustum cone, namely a right side cone and an external spiral line 8, and in a section passing through the thread axis 02, the complete single-section symmetrical two-way conical external thread 9 is a special two-way conical geometric thread 94 in the dumbbell-like 94 shape, which the middle is small, the two ends of which the left side cone is large, and the left side cone is the same as the right side cone and/or similar to the same as the left side cone The included angle between two element lines of the left side conical surface of the symmetrical bidirectional cone frustum 71, namely the first spiral conical surface 721 of the cone frustum is a first cone angle alpha 1, the left side conical degree 95 formed by the first spiral conical surface 721 of the cone frustum is corresponding to the first cone angle alpha 1 and is distributed in the right direction 98, the included angle between two element lines of the right side conical surface of the symmetrical bidirectional cone frustum 71, namely the second spiral conical surface 722 of the cone frustum is a second cone angle alpha 2, the right side conical degree 96 formed by the second spiral conical surface 722 of the cone frustum is corresponding to the second cone angle alpha 2 and is distributed in the left direction 97, the first cone angle alpha 1 and the second cone angle alpha 2 are opposite to each other in the corresponding conical directions, the element lines are the intersection lines of the conical surface and a plane passing through the cone axis 01, the shape formed by the first spiral conical surface 721 of the cone frustum 71 and the second spiral conical surface 722 of the cone frustum is the same as the upper surfaces of two right-angle trapezoids which are overlapped with the central axis of the columnar matrix 3 The right-angle sides of the right-angle trapezoid combination bodies with symmetrical bottom edges and oppositely jointed are the special geometric bodies, the rotation centers circumferentially rotate at a constant speed, the right-angle trapezoid combination bodies simultaneously move axially at a constant speed along the central axis of the columnar matrix 3, the spiral outer side surfaces of the revolution bodies formed by the two inclined sides of the right-angle trapezoid combination bodies are identical in shape, the upper bottom edges of the two identical right-angle trapezoids are symmetrically and oppositely jointed, and the lower bottom edges of the two identical right-angle trapezoids are respectively positioned at the two ends of the right-angle trapezoid combination bodies.

The internal thread 6 is arranged on the inner surface of the cylindrical parent body 2, and the cylindrical parent body 2 comprises a first nut body 21 and a second nut body 22, the inner surfaces of the first nut body 21 and the second nut body 22 are provided with tapered holes 4 which are distributed spirally, the tapered holes 4 comprising symmetrical bidirectional tapered holes 41 are special bidirectional tapered geometric bodies which are shaped like a dumbbell 94, and the cylindrical parent body 2 comprises a cylindrical body and/or a non-cylindrical body and other workpieces and objects which need to be processed with internal threads on the inner surface.

The dumbbell-like 94 symmetrical two-way tapered hole 41 is characterized in that the dumbbell-like 94 symmetrical two-way tapered hole 41 is formed by symmetrically and oppositely jointing the upper top surfaces of the same two tapered holes, the lower bottom surfaces of the same two tapered holes are positioned at two ends of the two-way tapered hole 41, when the dumbbell-like 94 symmetrical two-way tapered thread 1 is formed, the dumbbell-like 94 symmetrical two-way tapered thread is respectively jointed with the lower bottom surfaces of the adjacent two-way tapered holes 41, and/or is jointed with the lower bottom surfaces of the adjacent two-way tapered holes 41, the tapered hole 4 comprises a symmetrical two-way tapered hole conical surface 42, the internal thread 6 comprises a tapered hole first spiral conical surface 421, namely a left-side conical surface, and a tapered hole second spiral conical surface 422, namely a right-side conical surface and an internal spiral thread 5, in a section passing through a thread axis 02, the complete single-section symmetrical two-way tapered internal thread 6 is a special two-way tapered geometric body which is small in the middle, large in two ends, has the same left-side taper and the right-side taper and/or is approximately the same as the dumbbell-like 94 taper, the included angle formed by two plain lines of the left side conical surface of the bidirectional tapered hole 41, namely the first spiral conical surface 421 of the tapered hole, is a first taper angle α 1, the left side conical degree 95 formed by the first spiral conical surface 421 of the tapered hole corresponds to the first taper angle α 1 and is distributed in the right direction 98, the included angle formed by two plain lines of the right side conical surface of the bidirectional tapered hole 41, namely the second spiral conical surface 422 of the tapered hole corresponds to a second taper angle α 2, the right side conical degree 96 formed by the second spiral conical surface 422 of the tapered hole corresponds to the second taper angle α 2 and is distributed in the left direction 97, the taper directions corresponding to the first taper angle α 1 and the second taper angle α 2 are opposite, the plain lines are intersecting lines of the conical surfaces and a plane passing through the conical axis 01, and the shape formed by the first spiral conical surface 421 of the tapered hole of the bidirectional tapered hole 41 and the second spiral conical surface 422 of the tapered hole is symmetrical and oppositely jointed with a right angle coincident with the upper base line of two right-angle trapezoids same as the central axis of the tubular body 2 The right-angle sides of the trapezoid combination bodies are circumferentially and uniformly rotated around the rotation center, the right-angle trapezoid combination bodies axially move along the central axis of the cylindrical parent body 2 at a uniform speed simultaneously, the spiral outer side surfaces of the rotary bodies formed by the two inclined sides of the right-angle trapezoid combination bodies are identical in shape, the right-angle trapezoid combination bodies are special geometric bodies, the upper bottom edges of the two identical right-angle trapezoids are symmetrically and oppositely jointed, and the lower bottom edges of the two identical right-angle trapezoids are respectively located at the two ends of the right-angle trapezoid combination bodies.

In the present embodiment, the connection structure between the bolt and the double nut is adopted, the double nut includes the first nut body 21 and the second nut body 22, the first nut body 21 is located on the left side of the fastened workpiece 130, the second nut body 22 is located on the right side of the fastened workpiece 130, and the connection with the fastened workpiece 130 is rigid connection during operation, the rigid connection refers to the fact that the nut end surface bearing surface and the workpiece 130 bearing surface are bearing surfaces, and includes the locking bearing surface 111 and the locking bearing surface 112, and the workpiece 130 refers to the connected object including the workpiece 130.

The thread operation support surfaces of the present embodiment are different and include a tapered thread support surface 121 and a tapered thread support surface 122, and when the cylindrical parent body 2 is positioned on the left side of the workpiece 130 to be fastened, i.e., the left end surface of the workpiece 130 to be fastened, and the cylindrical parent body 2, i.e., the right end surface of the left first nut body 21, is the left first nut body 21 and the lock support surface 111 of the workpiece 130 to be fastened, the left helical conical surfaces of the bidirectional conical threads 1 of the bolt, i.e., the rod body 31, i.e., the left first nut body 21 and the cylindrical parent body 3, are the thread operation support surfaces, i.e., the tapered hole first helical conical surface 421 and the conical frustum first helical conical surface 721 are tapered thread support surfaces 122, and the tapered hole first helical conical surface 421 and the conical frustum first helical conical surface 721 are mutually support surfaces, and when the cylindrical parent body 2 is positioned on the right side of the workpiece 130 to be fastened, i.e., the right end surface of the workpiece 130 to be fastened, When the left end surface of the right second nut body 22, which is the cylindrical parent body 2, is the lock support surface 112 of the right second nut body 22 and the fastened workpiece 130, the right helical conical surface of the bidirectional tapered thread 1 of the bolt, which is the screw body 31, which is the right second nut body 22 and the columnar parent body 3, is the thread work support surface, i.e., the tapered hole second helical conical surface 422 and the truncated cone second helical conical surface 722 are the tapered thread support surfaces 121, and the tapered hole second helical conical surface 422 and the truncated cone second helical conical surface 722 are support surfaces for each other.

The bolt and the nut with the bidirectional tapered threads have the advantages that when the tapered thread connection pair 10 is in transmission connection, the bidirectional tapered hole 41 of the bidirectional tapered internal thread 6 is in screwing connection with the bidirectional tapered frustum body 71 of the bidirectional tapered external thread 9, bidirectional bearing is realized, when the external thread 9 and the internal thread 6 form the thread pair 10, a clearance 101 must be formed between the bidirectional tapered frustum body 71 and the bidirectional tapered hole 41, if oil and other media are lubricated between the internal thread 6 and the external thread 9, a bearing oil film is easy to form, the clearance 101 is favorable for forming the bearing oil film, the tapered thread connection pair 10 of the bolt and the nut with the bidirectional tapered threads is equivalent to a sliding bearing pair consisting of one or a plurality of sliding bearings, namely each section of the bidirectional tapered internal thread 6 is bidirectionally accommodated corresponding to one section of the bidirectional tapered external thread 9 to form one sliding bearing pair, and the number of the sliding bearings is adjusted according to application working conditions, the bidirectional conical internal thread 6 and the bidirectional conical external thread 9 are effectively and bidirectionally jointed, namely the number of contained and contained thread joints of the effective bidirectional contact cohesion is designed according to application working conditions, the conical frustum body 7 of the bidirectional conical external thread 9 is contained through the conical hole 4 of the conical internal thread 6, and the conical frustum body is positioned in multiple directions such as radial direction, axial direction, angular direction, circumferential direction and the like, so that a special synthesis technology of a conical pair and a thread pair is formed, and the transmission connection precision, efficiency and reliability of the conical thread technology, particularly the conical thread connection pair 10 of the bolt and the nut of the bidirectional conical thread are ensured.

According to the application working condition, the bearing in one direction and/or the bearing in two directions are achieved simultaneously and respectively, namely the bearing in one direction and/or the bearing in two directions are achieved simultaneously, namely the inner cone and the outer cone inner diameter are centered under the guiding of the bidirectional conical frustum body 71 and the bidirectional conical hole 41 until the inner cone and the outer cone inner diameter are centered until the conical hole first spiral conical surface 421 and the conical hole second spiral conical surface 422 are contacted with each other and/or the conical hole second spiral conical surface 422 and the conical frustum second spiral conical surface 721 are contacted with each other and/or the conical hole second spiral conical surface 422 and the conical frustum second spiral conical surface 721 are contacted with each other and/or the conical hole second spiral conical surface 721 are contacted with each other The conical surface 722 embraces until interference contact is achieved, so that the technical performances of mechanical mechanism connection performance, locking performance, anti-loosening performance, bearing performance, sealing performance and the like are achieved.

Therefore, the technical performance of the bolt and nut with bidirectional tapered threads and the tapered thread connection pair 10 in this embodiment, such as transmission accuracy, high transmission efficiency, low bearing capacity, self-locking force, looseness prevention capacity, good sealing performance, reusability, is related to the size of the first tapered conical surface 721 of the truncated cone, the left taper 95 formed by the first tapered conical surface α 1, the second tapered conical surface 722 of the truncated cone, the right taper 96 formed by the second tapered conical surface α 2, the first tapered conical surface 421 of the tapered hole, the left taper 95 formed by the first tapered conical surface α 1, the second tapered conical surface 422 of the tapered hole, and the right taper 96 formed by the second tapered conical surface 96, the second tapered conical surface α 2. The material friction coefficient, the processing quality and the application working condition of the columnar matrix 3 and the cylindrical matrix 2 also have certain influence on the conical matching.

In the tapered threaded connection pair 10 of the bolt and the nut with the bidirectional tapered threads, when the right-angled trapezoid combination rotates at a constant speed for one circle, the axial movement distance of the right-angled trapezoid combination is at least one time of the length of the sum of the right-angled sides of two identical right-angled trapezoids. This structure ensures that the frustum-conical body first helical conical surface 721 and the frustum-conical body second helical conical surface 722, and the tapered bore first helical conical surface 421 and the tapered bore second helical conical surface 422 have sufficient lengths, thereby ensuring that the bidirectional frustum-conical body conical surface 72 has sufficient effective contact area and strength when mated with the bidirectional tapered bore conical surface 42, and efficiency required for helical motion.

In the tapered threaded connection pair 10 of the bolt and the nut with the bidirectional tapered threads, when the right-angled trapezoid combination rotates at a constant speed for one circle, the axial movement distance of the right-angled trapezoid combination is equal to the sum of the right-angled sides of two identical right-angled trapezoids. This structure ensures that the frustum-conical body first helical conical surface 721 and the frustum-conical body second helical conical surface 722, and the tapered bore first helical conical surface 421 and the tapered bore second helical conical surface 422 have sufficient lengths, thereby ensuring that the bidirectional frustum-conical body conical surface 72 has sufficient effective contact area and strength when mated with the bidirectional tapered bore conical surface 42, and efficiency required for helical motion.

In the tapered thread connection pair 10 of the bolt and the nut with the bidirectional tapered threads, the first spiral conical surface 721 of the truncated cone body and the second spiral conical surface 722 of the truncated cone body are both continuous spiral surfaces or non-continuous spiral surfaces; the first conical hole surface 421 and the second conical hole surface 422 are both continuous helical surfaces or non-continuous helical surfaces.

In the tapered threaded connection pair 10 of the bidirectional tapered threaded bolt and the nut, one end and/or two ends of the cylindrical parent body 3 can be screwed into the screwing end of the connecting hole of the cylindrical parent body 2.

In the tapered threaded connection pair 10 of the bolt and the nut with the bidirectional tapered threads, one end of the columnar parent body 3 is provided with a head part with a size larger than the outer diameter of the columnar parent body 3 and/or one end or two ends of the columnar parent body 3 are provided with head parts with small diameters smaller than the bidirectional tapered external threads 9 of the threaded rod body 31 of the columnar parent body 3, and the connection holes are threaded holes arranged on the first nut body 21 and the second nut body 22. That is, the connection between the columnar parent body 3 and the head is a bolt, the connection has no head and/or the head at both ends is smaller than the small diameter of the bidirectional tapered external thread 9 and/or the connection has two bidirectional tapered external threads 9 at both ends without threads in the middle is a stud, and the connection holes are arranged in the first nut body 21 and the second nut body 22.

Compared with the prior art, the tapered thread connection pair 10 of the bolt with the bidirectional tapered thread and the nut has the advantages that: reasonable in design, simple structure, the vice sizing of circular cone through interior outer circular cone formation realizes fastening and connection function until interference fit, convenient operation, and the locking force is big, and the load value is big, and locking performance is good, and transmission efficiency and precision are high, and mechanical seal is effectual, and stability is good, can prevent to appear the pine phenomenon of taking off when connecting, has auto-lock and from the positioning function.

Example two

As shown in fig. 4, the structure, principle and implementation steps of the present embodiment are similar to those of the present embodiment, except that the present embodiment adopts a bolt-single nut connection structure, and the bolt body has a hexagonal head larger than the bolt body 31, and when the bolt hexagonal head is located on the left side, the cylindrical parent body 2, i.e., the first nut body 21, i.e., the single nut, is located on the right side of the workpiece 130 to be fastened, and when the bolt-single nut connection structure of the present embodiment is operated, the relationship with the workpiece 130 to be fastened is also rigid connection, where the rigid connection refers to a state where the end surface of the first nut body 21 and the opposite end surface of the workpiece 130 are bearing surfaces with each other, the bearing surfaces are lock bearing surfaces 111, and the workpiece 130 refers to the object to be connected including the workpiece 130.

In the present embodiment, the thread operation support surface is the tapered thread support surface 122, that is, the cylindrical parent body 2, that is, the first nut body 21, that is, the single nut, is located on the right side of the fastened workpiece 130, and when the bolt-and-single-nut connection structure is operated, the right end surface of the workpiece 130 and the left end surface of the first nut body 21 are the first nut body 21 and the fastened workpiece 130, and the right spiral conical surfaces of the bidirectional tapered thread 1 of the bolt, that is, the threaded operation support surface, that is, the tapered hole second spiral conical surface 422 and the truncated cone second spiral conical surface 722 are the tapered thread support surface 122, and the tapered hole second spiral conical surface 422 and the truncated cone second spiral conical surface 722 are support surfaces for each other.

In this embodiment, when the hexagonal head of the bolt is located at the right side, the structure, principle and implementation steps are similar to those of this embodiment.

EXAMPLE III

As shown in fig. 5, the structure, principle and implementation steps of the present embodiment are similar to those of the present embodiment, except that the double nut and the workpiece 130 to be fastened have different positional relationships, the double nut includes a first nut body 21 and a second nut body 22, the bolt body has a hexagonal head larger than the bolt body 31, when the hexagonal head of the bolt is located on the left side, the first nut body 21 and the second nut body 22 are both located on the right side of the workpiece 130 to be fastened, and when the bolt and the double nut connection structure of the present embodiment is operated, the relationship between the first nut body 21 and the second nut body 22 and the workpiece 130 to be fastened is a non-rigid connection, which means that the facing side end surfaces of the two nuts, i.e., the first nut body 21 and the second nut body 22, are bearing surfaces, and the bearing surfaces include a locking bearing surface 111 and a locking bearing surface 112, and are mainly applied to non-rigid connection of workpieces 130 such as non-rigid materials or transmission members or application fields such as meeting requirements by installing the double nuts. The workpiece 130 refers to a connected object including the workpiece 130. The thread working support surface of the present embodiment is different, and includes a tapered thread support surface 121 and a tapered thread support surface 122, the cylindrical body 2 includes a left first nut body 21 and a right second nut body 22, the right end surface of the left first nut body 21, i.e., the lock support surface 111, and the left end surface of the right second nut body 22, i.e., the lock support surface 112, are in direct contact with each other and are each a lock support surface, when the right end surface of the left first nut body 21 is the lock support surface 111, the left helical conical surface of the left first nut body 21 and the cylindrical body 3, i.e., the nut body 31, i.e., the bidirectional tapered thread 1 of the bolt, is a thread working support surface, i.e., the tapered hole first helical conical surface 421 and the truncated cone first helical conical surface 721 are the tapered thread support surface 122 and the tapered hole first helical conical surface 421 and the truncated cone first helical conical surface 721 are each other support surfaces, when the left end surface of the right second nut body 22 is the lock support surface 112, the right-side second nut body 22 and the cylindrical body 3, i.e., the screw body 31, i.e., the right-side helical conical surface of the bidirectional tapered thread 1 of the bolt, are screw operation support surfaces, i.e., a tapered-hole second helical conical surface 422 and the truncated-cone second helical conical surface 722 are tapered screw support surfaces 121, and the tapered-hole second helical conical surface 422 and the truncated-cone second helical conical surface 722 are support surfaces for each other.

In this embodiment, when the inner cylindrical parent body 2, i.e., the first nut body 21 adjacent to the fastened workpiece 130, has been effectively combined with the cylindrical parent body 3, i.e., the bolt body 31, i.e., the bolt, i.e., the internal thread 6 and the external thread 9 constituting the tapered threaded connection pair 10, effectively clasped together, the outer cylindrical parent body 2, i.e., the second nut body 22 not adjacent to the fastened workpiece 130, may be kept as it is and/or removed according to the application requirements and only one nut is left (for example, when the equipment requires light weight or does not require double nuts to ensure the reliability of the connection technology, etc.), the removed second nut body 22 may not be used as a connection nut but only as an installation process nut, wherein the internal thread of the installation process nut is made of a bidirectional tapered thread, and may be made of a unidirectional tapered thread and other threads capable of being screwed with the tapered thread, i., The second nut body 22 manufactured by the threads of the non-tapered threads such as the trapezoidal threads and the saw-tooth threads ensures the reliability of the connection technology, the tapered threaded connection pair 10 is a closed-loop fastening technology system, namely after the internal threads 6 and the external threads 9 of the tapered threaded connection pair 10 are effectively clasped together, the tapered threaded connection pair 10 is an independent technology system without depending on the technology compensation of the third party to ensure the technical effectiveness of the connection technology system, namely even if no other objects support the second nut body, the gap between the tapered threaded connection pair 10 and the fastened workpiece 130 cannot influence the effectiveness of the tapered threaded connection pair 10, the weight of the equipment can be greatly reduced, the ineffective load can be removed, the effective load capacity, the braking performance, the energy conservation and emission reduction of the equipment can be improved, and the technical requirements of the bolt and nut connection structure of the bidirectional tapered threaded connection pair 10 and the fastened workpiece 130 can be both non-rigid connection and rigid connection The thread technology has the advantages that the thread technology is unique in connection and the other thread technologies do not have.

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

Example four

As shown in fig. 6, the structure, principle and implementation steps of the present embodiment are similar to those of the first and third embodiments, and are different from those of the first and third embodiments in that a spacer such as a spacer 132 is added between the first nut body 21 and the second nut body 22, that is, the right end surface of the left first nut body 21 and the left end surface of the right second nut body 22 face each other and indirectly contact each other through the spacer 132 and thus indirectly become lock bearing surfaces.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.

Although tapered thread 1, cylindrical parent body 2, first nut body 21, second nut body 22, cylindrical parent body 3, screw body 31, tapered bore 4, bidirectional tapered bore 41, bidirectional tapered bore conical surface 42, tapered bore first helical conical surface 421, first taper angle α 1, tapered bore second helical conical surface 422, second taper angle α 2, internal thread 5, internal thread 6, frustum cone 7, bidirectional frustum cone 71, bidirectional frustum cone conical surface 72, frustum cone first helical conical surface 721, first taper angle α 1, frustum second helical conical surface 722, second taper angle α 2, external thread 8, external thread 9, dumbbell-like 94, left-side taper 95, right-side taper 96, left-side distribution 97, right-side distribution 98, thread connection pair and/or thread pair 10, play 101, self-locking force, self-locking, self-positioning, self-locking, or self-locking, Pressure, conical axis 01, thread axis 02, mirror image, bushing, shaft, single cone, double cone, inner cone, tapered bore, outer cone, conical pair, helical structure, helical motion, thread body, complete unit body thread, axial force angle, counter axial force angle, centripetal force, counter positive force, counter colinear, internal stress, bi-directional force, unidirectional force, sliding bearing pair, lock bearing surface 111, lock bearing surface 112, tapered thread bearing surface 122, tapered thread bearing surface 121, non-solid space, material solid, workpiece 130, nut body lock direction 131, non-rigid connection, non-rigid material, transmission member, shim 132, and like terms, but without excluding the possibility of using other terms, these terms are used merely to more conveniently describe and explain the essence of the invention, they are to be construed as being without limitation to any additional limitations that may be imposed by the spirit of the present invention.

Claims (10)

1. A bolt and nut connecting structure of dumbbell-like symmetrical bidirectional conical threads comprises external threads (9) and internal threads (6) which are in threaded fit with each other, and is characterized in that the complete unit body threads of the dumbbell-like symmetrical bidirectional conical threads (1) are dumbbell-like (94) symmetrical bidirectional conical bodies which are spiral, small in the middle and large in two ends, and comprise bidirectional conical holes (41) and bidirectional conical frustum bodies (71), the internal threads (6) are cylindrical parent bodies (2) with spiral bidirectional conical holes (41), the external threads (9) are cylindrical parent bodies (3) with spiral bidirectional conical frustum bodies (71), left side conical surfaces of the dumbbell-like symmetrical bidirectional conical bodies (94) form left side conical surfaces (95) corresponding to first conical angles alpha 1, right side conical surfaces form right side conical surfaces (96) corresponding to second conical angles alpha 2, the left side taper (95) and the right side taper (96) are opposite in direction and have the same or approximately the same taper, the internal thread (6) and the external thread (9) contain the taper through the taper hole until the internal taper and the external taper are mutually loaded, wherein the first taper angle alpha 1 is more than 0 degree and less than 53 degrees, the second taper angle alpha 2 is more than 0 degree and less than 53 degrees; or the first taper angle alpha 1 is larger than or equal to 53 degrees and smaller than 180 degrees, and the second taper angle alpha 2 is larger than or equal to 53 degrees and smaller than 180 degrees.

2. The bolt-and-nut connection structure of dumbbell-like symmetrical bi-directional tapered threads according to claim 1, it is characterized in that the internal thread (6) comprises a left side conical surface, namely a first conical hole spiral conical surface (421), and a right side conical surface, namely a second conical hole spiral conical surface (422), of the bidirectional conical hole conical surface (42), and an internal spiral (5), wherein the first conical hole conical surface (421) and the second conical hole conical surface (422), namely the bidirectional spiral conical surface, form a shape, the right-angle sides of a right-angle trapezoid combination body which is symmetrical and oppositely jointed with the upper hemlines of two same right-angle trapezoids superposed on the central axis of the cylindrical parent body (2) are taken as the rotation center, the rotation is carried out at a uniform speed in the circumferential direction, the right-angle trapezoid combination body simultaneously moves axially at a uniform speed along the central axis of the cylindrical parent body (2), the spiral outer side surfaces of the revolution bodies formed by the two bevel edges of the right-angle trapezoidal combination bodies have the same shape; the external thread (9) comprises a left side conical surface, namely a first spiral conical surface (721) of the conical frustum body, a right side conical surface, namely a second spiral conical surface (722) of the conical frustum body, and an external spiral line (8) of the conical frustum body conical surface (72), the first spiral conical surface (721) of the conical frustum body and the second spiral conical surface (722) of the conical frustum body are in a shape formed by the two spiral conical surfaces, the right-angle sides of the right-angle trapezoidal bodies are symmetrical and oppositely jointed with the upper bottom edges of two same right-angle trapezoids superposed on the central axis of the columnar parent body (3) and are used as rotation centers, the rotation is carried out in the circumferential direction at a constant speed, the right-angle trapezoidal bodies simultaneously move axially along the central axis of the columnar parent body (3) at a constant speed, and the shape of the outer spiral side surface of the rotary body formed by two inclined sides of the right-angle trapezoidal bodies is the same.

3. The dumbbell-like symmetrical two-way tapered threaded bolt and nut connection structure of claim 2, wherein the distance that the right-angled trapezoidal combination moves axially when the right-angled trapezoidal combination rotates at a constant speed for one revolution is at least one time the length of the sum of the two right-angled sides of the right-angled trapezoidal combination.

4. The dumbbell-like symmetrical bi-directional tapered threaded bolt and nut connection structure of claim 2, wherein the distance that the right-angled trapezoidal combination moves axially when the right-angled trapezoidal combination rotates at a constant speed for one revolution is equal to the length of the sum of the right-angled sides of the two right-angled trapezoidal combinations.

5. The structure of claim 2, wherein the left and right tapered surfaces of the bi-directional tapered body, i.e. the first tapered bore spiral conical surface (421), the second tapered bore spiral conical surface (422), and the inner spiral (5), are continuous helical surfaces or discontinuous helical surfaces, and the first tapered frustum conical surface (721), the second tapered frustum conical surface (722), and the outer spiral (8) are continuous helical surfaces or discontinuous helical surfaces.

6. The structure for connecting a bolt and a nut with dumbbell-like symmetrical bi-directional tapered threads according to claim 1, wherein the internal threads (6) are formed by joining the upper top surfaces of two identical tapered holes (4) symmetrically and oppositely, and the lower bottom surfaces are located at both ends of the bi-directional tapered holes (41), and the dumbbell-like (94) symmetrical bi-directional tapered threads (1) are formed by joining the lower bottom surfaces of two adjacent bi-directional tapered holes (41), respectively, and/or joining the lower bottom surfaces of two adjacent bi-directional tapered holes (41), respectively, to form spiral dumbbell-like (94) symmetrical bi-directional tapered threads internal threads, and the external threads (9) are formed by joining the upper top surfaces of two identical frustum cones (7) symmetrically and oppositely, and the lower bottom surfaces are located at both ends of the frustum cone (71), and the dumbbell-like (94) symmetrical bi-directional tapered threads (1) are formed, the spiral dumbbell-shaped external thread is spirally formed into a dumbbell-like (94) symmetrical bidirectional conical thread external thread, and/or the spiral external thread is mutually jointed with the lower bottom surfaces of the adjacent bidirectional conical frustum bodies (71).

7. The connecting structure of the bolt and the nut with the dumbbell-like symmetrical bidirectional conical threads according to claim 1, characterized in that the internal threads (6) and the external threads (9) form a threaded connection pair (10), which is formed by a first conical hole spiral conical surface (421) and a second conical hole spiral conical surface (422) and a first conical frustum spiral conical surface (721) and a second conical frustum spiral conical surface (722) which are matched with each other, and are supported by using contact surfaces as bearing surfaces, and/or the internal diameter and the external diameter of the internal cone and the external cone are centered under the guidance of a spiral line until the bidirectional conical hole conical surface (42) and the bidirectional conical frustum conical surface (72) are in self-positioning contact and/or self-locking.

8. The bolt and nut connecting structure of dumbbell-like symmetrical bi-directional tapered threads according to claim 1, wherein the relation between the cylindrical parent body (3) and the cylindrical parent body (2) includes rigid connection or non-rigid connection when the connecting structure works, the rigid connection refers to a connecting structure in which the nut bearing surface and the workpiece (130) bearing surface are bearing surfaces, and the connecting structure includes a single nut and a double nut, the non-rigid connection refers to a connecting structure in which the facing surfaces of the two nuts are bearing surfaces or the facing surfaces of the two nuts are provided with a gasket (132) and indirectly serve as bearing surfaces, and the connecting structure is mainly applied to non-rigid connecting workpieces including non-rigid materials and transmission members or application fields in which the requirements are required to be met through the installation of the double nuts, the workpieces (130) refer to connected objects including workpieces, the gasket (132) is a spacer comprising the gasket, when a cylindrical parent body (2) is effectively combined with a cylindrical parent body (3), namely an internal thread (6) and an external thread (9) which form a threaded connection pair (10) are effectively embraced together, the other cylindrical parent body is removed or retained, the removed cylindrical parent body is used as an installation process nut, the internal thread comprises a bidirectional tapered thread (1), a unidirectional tapered thread and a suitable traditional thread comprising a triangular thread, a trapezoidal thread, a zigzag thread, a rectangular thread and an arc thread, and the internal thread comprises a thread body, namely a traditional thread of which a tooth body is subjected to deformation treatment.

9. The bolt and nut connecting structure of the dumbbell-like symmetrical bidirectional tapered thread according to claim 1 or 8, characterized in that one end or both ends of the cylindrical parent body (3) are screwed into the screwing ends of the connecting holes of the cylindrical parent body (2), the connecting holes are threaded holes arranged on the nut, namely threaded holes on the first nut body (21) and the second nut body (22), the connecting holes are arranged in the first nut body (21) and the second nut body (22), and the nut is an object comprising the nut and having a threaded structure on the inner surface of the cylindrical parent body.

10. The structure of claim 1, wherein the internal threads (6) and/or the external threads (9) comprise a single-thread body with an incomplete tapered geometry, i.e., a single-thread body with an incomplete unit-body thread.

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