CN213744397U - Connection structure of external threads of dumbbell-like symmetrical bidirectional tapered threads and traditional threads - Google Patents

Abstract

The utility model belongs to the technical field of equipment is general, a connection structure of two-way toper screw thread external screw thread of class dumbbell shape symmetry and traditional screw thread is related to, the current screw thread is solved from the poor scheduling problem of location and auto-lock nature, characterized by, external screw thread (9) are that column parent (3) outward surface is heliciform and complete unit body screw thread is that left side tapering (95) are the same with right side tapering (96) and/or approximate same dumbbell shape (94) two-way frustum body (71) (material entity), traditional internal thread (6) ability of assimilating has, internal thread (6) are tube-shape parent (2) internal surface is special bell mouth of heliciform (4) after assimilating, 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 cone frustum body (71) and the special taper hole (4) to form a 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

Connection structure of external threads of dumbbell-like symmetrical bidirectional tapered threads and traditional threads

Technical Field

The utility model belongs to the technical field of equipment is general, especially, relate to a kind of dumbbell shape symmetry two-way toper screw thread connection structure of external screw thread and traditional screw thread (hereinafter referred to as "two-way toper external screw thread and traditional screw thread").

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 the 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 scientific and technological progress, destroy the more non-static more non-room temperature environment of non-pure linear load to connecting, there is the non-linear load of linear load 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 connection structure of two-way toper external screw thread and traditional screw thread that reasonable in design, simple structure have good connection performance, locking performance.

In order to achieve the above purpose, the utility model adopts the following technical proposal: the connection structure of the external thread of the dumbbell-shaped symmetrical bidirectional tapered thread and the traditional thread is a thread connection pair consisting of the external thread of the symmetrical bidirectional tapered thread and the internal thread of the traditional thread, is a special thread pair technology combining the technical characteristics of a conical pair and a spiral motion, the bidirectional tapered thread external thread is a thread technology combining technical characteristics of a bidirectional tapered body and a spiral structure, the bidirectional conical body consists of two single conical bodies which are opposite in the direction of the left side and the right side and have the same and/or approximately the same taper, the symmetrical bidirectional tapered thread external thread is formed by spirally distributing a bidirectional conical body on the outer surface of a columnar parent body, the complete unit body thread is a special bidirectional tapered geometric body which is in a dumbbell-like shape, has a small middle and large two ends, and has the same left-side taper and right-side taper and/or the similar taper.

This kind of connection structure of two-way toper screw thread external screw thread of dumbbell-like symmetry and traditional screw thread, the two-way toper external screw thread definition of dumbbell-like symmetry, can express as: the special bidirectional cone-shaped geometric body is characterized in that the special bidirectional cone-shaped geometric body is arranged on the outer surface of a cylinder or a cone, has a symmetrical bidirectional cone frustum body which specifies left-side taper and right-side taper, has the left-side taper and the right-side taper in opposite directions and has the same taper and/or is approximately the same, and is spirally distributed continuously and/or discontinuously along a spiral line, has a small middle part and two large 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 two-way toper external screw thread and traditional screw thread, including screw-thread fit's each other external screw thread and internal thread, the external screw thread is the two-way cone frustum body that the heliciform distributes in column parent surface, and the internal thread is the special bell mouth that the heliciform distributes in tube-shape parent internal surface, and the internal thread exists in order to be the special bell mouth of heliciform and with "non-entity space" form promptly, the external screw thread exists in order to be the two-way cone frustum body of heliciform and with "material entity" form, non-entity space refer to the space environment that can hold above-mentioned material entity, and the internal screw thread is the container, and the external screw thread is by the container: the internal thread and the external thread are sleeved together in a one-section-by-one-section rotary manner and are embraced until one-side bidirectional bearing or left-side and right-side bidirectional bearing or until sizing interference fit, whether two sides simultaneously carry the bidirectional bearing is related to practical working conditions, namely, the traditional internal thread is a bidirectional cone frustum body which is formed by contacting with the external thread of the bidirectional cone thread and contains the external thread of the two-way cone thread in a one-section-by-one-section manner, namely, the internal thread is a corresponding external thread embraced in a one-section-by-one-section manner.

The thread connection pair is a thread pair formed by a cone pair formed by mutually matching a spiral outer conical surface and a spiral inner conical surface, a section of cone pair formed by mutually matching a spiral conical hole and a spiral cone frustum body, the outer conical surface of the outer cone of the bidirectional conical thread is a bidirectional conical surface, when the bidirectional conical external thread and the traditional internal thread form the thread connection pair, the joint surface of the traditional internal thread special conical surface and the outer conical surface of the bidirectional conical external thread is used as a bearing surface, namely the conical surface is used as the bearing surface, the connection technical performance, the self-locking property, the self-positioning property, the reusability, the fatigue resistance and other capabilities of the thread pair are mainly determined by the conical surface of the bidirectional conical external thread cone frustum body forming the bidirectional conical external thread and the traditional thread, the size of the conical surface of the bidirectional conical external thread frustum body and the conical degree of the traditional thread, and the special conical hole and the conical degree formed by the contact of the traditional thread edge with the bidirectional conical external thread, is a non-thread type thread.

Compared with the existing screw thread inclined plane principle which shows that the unidirectional force is distributed on the inclined plane and the internal and external threads are the meshing relation of the internal tooth body and the external tooth body, the bidirectional conical external thread and the traditional screw thread, the external thread body which is the bidirectional conical body is in a bidirectional state through a conical axis section, the single conical body which is distributed on any one of the left side or the right side is composed of two prime lines of a cone in a bidirectional way, the prime line is an intersection line of a conical surface and a plane which passes through the conical axis, the conical principle of the connecting structure of the bidirectional conical external thread and the traditional screw thread shows axial force and counter axial force which are both synthesized by bidirectional force, the axial force is opposite to the corresponding counter axial force, the internal thread and the external thread are in a cohesive relation, namely, a thread pair is formed by that the internal thread embraces the external thread, namely a cone (internal cohesion) and a corresponding one-section cone (external) until cohesive sizing are matched to realize self-positioning or until sizing interference contact to realize self-locking, the inner cone and the outer cone are radially locked or self-positioned together through the special taper hole and the cone frustum body, so that self-locking or self-positioning of a thread pair is realized, and the thread connection pair formed by the non-traditional thread inner thread and the outer thread is realized through mutual abutting of a tooth body and the tooth body. 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 relation of the irreversible single-side bidirectional contained relation that the single-cone-shaped unidirectional conical thread of the single cone can only bear the conical surface on the single side, the reversible left-right bidirectional contained relation of the bidirectional conical thread of the double cone can respectively bear the left-side bearing of the conical surface and/or bear the right-side conical surface of the left-side conical surface in a bidirectional and simultaneous manner, disordered freedom degree between a special conical hole and the cone frustum is further limited, the spiral motion enables the bidirectional conical external thread and the traditional thread connecting structure to obtain 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 connecting structure of the bidirectional conical external thread and the traditional thread is used, the conical surface of the bidirectional conical frustum of the bidirectional conical external thread is matched with the special conical surface of the special conical hole of the traditional internal thread. The bidirectional tapered external thread and the traditional thread, the bidirectional tapered external thread, namely the cone frustum body, can realize self-locking and/or self-positioning of the threaded connection pair instead of any taper or any taper angle, the external cone body has a certain taper or a certain taper angle, the bidirectional tapered external thread and the traditional threaded connection structure have self-locking and self-positioning performances, the taper comprises left taper and right taper of the external thread body, the left taper corresponds to a left taper angle, namely a first taper angle alpha 1, preferably, the 0 degree < the first taper angle alpha 1 < 53 degrees, preferably, the first taper angle alpha 1 takes a value of 2-40 degrees, the right taper corresponds to a right taper angle, namely a second taper angle alpha 2, preferably, the 0 degree < the first taper angle alpha 2 < 53 degrees, preferably, the second taper angle alpha 2 is 2-40 degrees, and in individual special fields, preferably, the first taper angle alpha 1 is larger than or equal to 53 degrees and smaller than 180 degrees, the second taper angle alpha 2 is larger than or equal to 53 degrees and smaller than 180 degrees, preferably, the first taper angle alpha 1 is larger than or equal to 53 degrees and smaller than or equal to 90 degrees, and the second taper angle alpha 2 is larger than or equal to 53 degrees and smaller than or equal to 90 degrees.

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 bidirectional tapered external thread is characterized in that the columnar matrix is provided with a screw rod body, the outer surface of the screw rod body is provided with circular truncated cones which are distributed spirally, the circular truncated cones comprise symmetrical bidirectional circular truncated cones, the columnar matrix can be solid or hollow and comprises workpieces and objects which need to be threaded on the outer surface of the columnar matrix, such as cylinders and/or non-cylinders, and the outer surface of the columnar matrix comprises the geometric shapes of the outer surfaces, such as cylindrical surfaces and/or non-cylindrical surfaces, including the conical surfaces.

The bidirectional tapered external thread and the traditional thread are characterized in that the thread is formed by connecting the upper top surfaces of two identical conical frustum bodies symmetrically and oppositely and spirally, the lower bottom surfaces of the two identical conical frustum bodies are positioned at two ends of the bidirectional conical frustum body, and the dumbbell-shaped symmetrical bidirectional tapered thread is formed by respectively connecting the upper top surfaces of the two identical conical frustum bodies with the lower bottom surfaces of the two adjacent bidirectional conical frustum bodies, and/or connecting the lower bottom surfaces of the two identical conical frustum bodies with the lower bottom surfaces of the two adjacent bidirectional conical frustum bodies to form a spiral thread, the external thread comprises a first spiral conical surface of the conical frustum body, namely a left conical surface, a second spiral conical surface of the conical frustum body, namely a right conical surface and an external spiral line, in a cross section passing through the axis of the thread, the complete single-section symmetrical bidirectional tapered external thread is a special bidirectional tapered geometric body which is small in the middle, has two large ends, has the left conical degree identical with the right conical degree and/or approximately, the bidirectional cone frustum comprises a bidirectional cone frustum conical surface, wherein the included angle between two plain 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-side taper and is distributed in the right direction, the left-side taper corresponds to the first cone angle alpha 1, the included angle between two plain 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-side taper and is distributed in the left direction, the right-side taper corresponds to the second cone angle alpha 2, the taper directions corresponding to the first cone angle alpha 1 and the second cone angle alpha 2 are opposite, the plain lines are intersection lines of a conical surface and a plane passing through a cone axis, and the shape formed by the first spiral conical surface of the cone frustum central axis and the second spiral conical surface of the cone frustum of the bidirectional cone frustum is symmetrical and opposite to and connected to two right-angle trapezoids which are the same as the bottom edge of a columnar parent body The right-angle sides of the combined right-angle 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 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 trapezoid combination bodies are identical in shape, the right-angle trapezoid combination bodies are special geometric bodies, 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 located at the two ends of the right-angle trapezoid combination bodies.

The bidirectional tapered external thread has the unique technical characteristics and advantages that the thread body is a tapered body, namely a cone frustum body, and has strong capability of assimilating different threads, namely the capability of assimilating the traditional thread matched with the bidirectional tapered external thread into the special tapered thread with the same technical characteristics and properties as the thread body, the traditional thread after being assimilated by the tapered thread is a dissimilated traditional thread, namely the dissimilated traditional thread, the appearance of the thread body is not greatly different from that of a traditional thread tooth body, but the substantial technical content of the thread body of the traditional thread is not possessed, the thread body is changed from the original traditional thread tooth body into the special tapered geometric body with the thread body properties, namely the tapered body properties and the technical characteristics of the tapered thread, the special tapered geometric body has a special conical surface which can be matched with the spiral conical surface of the tapered thread in the radial direction, and the traditional thread comprises a triangular thread, a cone, a triangular thread, a cone, a conical surface and a tapered thread, The trapezoidal thread, the zigzag thread, the rectangular thread, the circular arc thread and the like can be screwed with the bidirectional tapered thread to form other geometrical threads of the threaded connection pair, but are not limited to the above threads, the threads are applicable to traditional threads including the traditional threads, and the threads include traditional threads of which thread bodies, namely tooth bodies, are subjected to deformation treatment.

When the traditional internal thread and the bidirectional tapered external thread are matched to form a threaded connection pair, the traditional internal thread is not the traditional thread in the original meaning but is a tapered thread in a special form assimilated by the tapered thread, the contact part of the traditional internal thread and the bidirectional tapered external thread forms the inner surface of a special tapered hole of the traditional internal thread of the threaded connection pair, which can be matched with the spiral conical surface of the tapered thread, the special tapered hole is provided with a special conical surface, the effective conical surface area of the special conical surface on the special tapered hole of the traditional internal thread is continuously increased along with the increase of the number of times of screwing use, namely the special conical surface is continuously increased and tends to have larger contact surface direction change with the conical surface of the conical frustum of the bidirectional tapered external thread, and the special tapered hole which has incomplete tapered geometric shape and has the technical spirit of the invention is formed substantially, furthermore, the special taper hole is a thread body formed by assimilation contact of a traditional internal thread edge and a bidirectional taper external thread, and is a special taper geometric body transformed from a traditional internal thread tooth body, the special taper hole radially has an inner surface matched with the taper surface of the bidirectional taper frustum body, namely, a special taper surface, namely, the thread connection pair is formed by mutually matching a spiral external cone surface, namely, an external cone surface of the bidirectional taper external thread, and a spiral special internal cone surface, namely, a special taper hole special taper surface formed by contact of a traditional internal thread edge and the bidirectional taper external thread to form a taper pair, the external cone surface, namely, an external cone surface of the cone frustum body is a bidirectional taper surface, the traditional thread after assimilation is a dissimilarity traditional thread which is a dissimilarity traditional thread, is a special form taper thread, the internal cone surface of the special taper thread of the special taper internal thread, namely, the special taper surface of the traditional internal thread firstly appears in a linear form, the inner conical surface is gradually increased along with the increase of the contact use times of the traditional internal thread cusp and the cone frustum body of the bidirectional conical external thread, namely the special conical surface of the traditional internal thread is continuously changed and increased from a microscopic surface (a macroscopic surface is a line) to a macroscopic surface, and the inner conical surface matched with the bidirectional conical external thread can be directly processed at the cusp part of the traditional internal thread, which all accord with the technical spirit of the invention. The bidirectional tapered external thread and the traditional thread are characterized in that the cylindrical parent body is provided with a nut body, the inner surface of the nut body is provided with special tapered holes which are distributed spirally, the special tapered holes are special tapered holes formed by the fact that the traditional internal thread is in contact with the bidirectional tapered external thread, special conical surfaces are arranged on the special tapered 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 thread on the inner surface, and the inner surface comprises the inner surface geometrical shapes such as non-cylindrical surfaces such as a cylindrical surface and a conical surface. When the connecting structure of the bidirectional tapered external thread and the traditional thread 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 bidirectional tapered external thread and the traditional thread adopt a connection structure of a bidirectional tapered thread bolt and a traditional thread double nut, and when the connection structure is rigidly connected with a fastened workpiece, the thread working bearing surface, namely a tapered thread bearing surface, is 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 the left side nut body, is the locking bearing surface of the left side nut body and the fastened workpiece, a cylindrical parent body, namely a bolt body, namely a left side spiral conical surface of the bidirectional tapered thread of the bolt is a tapered thread bearing surface, namely a traditional internal thread special conical surface and a first spiral conical surface of a bidirectional tapered external thread conical frustum are tapered thread bearing surfaces, and 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, When the left end surface of the cylindrical parent body, namely the right nut body, is a locking bearing surface of the right nut body and a fastened workpiece, the right spiral conical surface of the cylindrical parent body, namely the screw body, namely the bidirectional conical thread of the bolt, is a conical thread bearing surface, namely the traditional internal thread special conical surface and the second spiral conical surface of the bidirectional conical external thread frustum are conical thread bearing surfaces, and the traditional internal thread special conical surface and the second spiral conical surface of the frustum are bearing surfaces.

When the bidirectional tapered external thread and the traditional thread are in rigid connection with a fastened workpiece in a bidirectional tapered thread bolt and traditional thread single nut connection structure, 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 connection 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 cylindrical parent body, namely the bolt body, namely the right helical conical surface of the bidirectional tapered thread of the bolt is a tapered thread supporting surface, namely a traditional internal thread special conical surface and a second helical conical surface of the bidirectional tapered external thread conical body are tapered thread supporting surfaces, and the traditional internal thread special conical surface and the second helical conical surface of the conical frustum body are supporting surfaces; 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 cylindrical parent body, namely the bolt body, namely the left side spiral conical face of the bidirectional conical thread of the bolt is a conical thread supporting face, namely the traditional internal thread special conical face and the first spiral conical face of the bidirectional conical external thread frustum are conical thread supporting faces, and the traditional internal thread special conical face and the first spiral conical face of the frustum are mutually supporting faces.

When 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 an opposite way and is a locking support surface, when the right end surface of the left nut body is the locking support surface, the left spiral conical surface of the cylindrical parent body, namely the screw body, namely the bidirectional conical thread of the bolt is a conical thread support surface, namely a traditional internal thread special conical surface and a first spiral conical surface of a bidirectional conical external thread conical frustum are conical thread support surfaces, and the traditional internal thread special conical surface and the first spiral conical surface of the conical frustum are support surfaces, when the left end surface of the right nut body is the locking support surface, the cylindrical parent body, namely the screw body, namely the right spiral conical surface of the bidirectional conical thread of the bolt is a conical thread bearing surface, namely the traditional internal thread special conical surface and the second spiral conical surface of the bidirectional conical external thread frustum are conical thread bearing surfaces, and the traditional internal thread special conical surface and the second spiral conical surface of the frustum are bearing surfaces.

The bidirectional conical external thread and the traditional thread are in a connection structure of a bidirectional conical thread bolt and a traditional thread double nut, and when the bidirectional conical thread bolt and the traditional thread double nut are in non-rigid connection with a fastened workpiece, the conical thread bearing surface is different, the 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, the right end surface of the left nut body and the left end surface of the right nut body are in opposite indirect contact through the gasket, so that the two cylindrical parent bodies are 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, the cylindrical parent bodies, namely the bolt body, namely the left spiral conical surface of the bidirectional conical thread bolt is the conical thread bearing surface, namely the first spiral conical surface of the traditional internal thread special conical surface and the bidirectional conical surface of the bidirectional conical external thread cone body are the conical thread bearing surface, and the second spiral conical surface of the traditional internal thread special conical surface and the conical surface are the conical surface When the cylindrical parent body is positioned on 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 bearing surface of the right nut body, the cylindrical parent body, namely the screw body, namely the right spiral conical surface of the bidirectional conical thread of the bolt is a conical thread bearing surface, namely the traditional internal thread special conical surface and the second spiral conical surface of the bidirectional conical external thread frustum are conical thread bearing surfaces, and the traditional internal thread special conical surface and the second spiral conical surface of the frustum are bearing surfaces. The bidirectional tapered external thread and the traditional thread are in a connection structure of a bidirectional tapered thread bolt and a traditional thread double nut, and when the connection structure is in non-rigid connection with a fastened workpiece, 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 internal thread and an external thread which form a thread connection 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, only one nut is left (for example, the application fields such as light weight of equipment or reliability of connection technology and the like are ensured without double nuts), the disassembled nut body is not used as a connecting nut but only used as an installation process nut, and the internal thread of the installation process nut is manufactured by the traditional thread, the nut body can be manufactured by adopting bidirectional tapered threads and unidirectional tapered threads which can be screwed with bolt threads, and the reliability of the connection technology is ensured, the threaded connection pair is a closed-loop fastening technology system, namely the threaded connection pair is formed into an independent technology system after the internal threads and the external threads of the threaded connection pair are effectively clasped together, the technical effectiveness of the connection technology system is ensured without depending on the technical compensation of the third party, namely the effectiveness of the threaded connection pair cannot be influenced even if no other objects are supported, including a gap between the threaded connection pair and a fastened workpiece, so that the technical requirements of greatly lightening the weight of equipment, removing ineffective load, improving the effective load capacity, the braking performance, energy conservation and emission reduction of the equipment and the like are met, this is a thread technical advantage which is unique when the thread connection pair of the connection structure of the bidirectional tapered external thread and the conventional thread is in relation to a fastened workpiece, whether the connection is non-rigid or rigid, but which other thread techniques do not have.

The bidirectional tapered external thread is in transmission connection with the traditional thread, the bidirectional bearing is realized by screwing and connecting the special taper hole of the traditional internal thread with the bidirectional frustum body, when the external thread and the internal thread form a thread pair, a clearance is required between the bidirectional frustum body and the special taper hole of the traditional internal thread, if oil and other media are lubricated between the internal thread and the external thread, a bearing oil film is easily formed, and the clearance is favorable for forming the bearing oil film. According to the design of application working conditions, the conical external thread frustum is contained by the traditional internal thread special conical hole, and the conical external thread frustum is positioned in multiple directions such as radial direction, axial direction, angular direction and circumferential direction, preferably, the bidirectional conical frustum is contained by the special conical hole, the radial direction and circumferential direction main positioning is assisted by the axial direction and angular direction auxiliary positioning, so that the inner cone and the outer cone are positioned in multiple directions until the special conical surface of the special conical hole is embraced with the conical surface of the bidirectional conical frustum to realize self-positioning or self-locking is generated until fixed diameter interference contact is generated, a special conical pair and thread pair synthesis technology is formed, and the precision, the efficiency and the reliability of the transmission connection of the conical thread technology, particularly the bidirectional conical external thread and the traditional thread are ensured. The bidirectional conical external thread and the traditional thread are tightly connected and hermetically connected, the technical performance is realized by the screwing connection of the traditional internal thread special conical hole and the conical external thread bidirectional conical frustum body, namely, the sizing of the first spiral conical surface of the conical frustum body and the traditional internal thread special conical hole special conical surface is realized until interference and/or the sizing of the second spiral conical surface of the conical frustum body and the traditional internal thread special conical hole special conical surface is realized until interference, and according to the application working condition, one-direction bearing and/or two-direction simultaneous bearing are achieved, namely, the internal and external diameters of the traditional internal thread special conical hole inner cone and the conical external thread outer cone are centered until the traditional internal thread special conical hole special conical surface and the conical external thread outer cone are clasped until the traditional internal thread special conical hole special conical surface and the conical frustum body first spiral conical surface are contacted and/or the traditional internal thread special conical hole special conical surface and the conical frustum body are clasped until the interference contact and/or the traditional internal thread special conical frustum body is contacted The second spiral conical surface is embraced until interference contact is achieved, namely the self-locking and radial, axial, angular, circumferential and other multi-directional positioning of the cone-shaped external thread bidirectional outer cone is contained through the traditional internal thread special conical hole, preferably, the special taper hole contains the bidirectional cone frustum and the radial and circumferential main positioning is assisted with the axial and angular auxiliary positioning to form the multi-directional positioning of the inner cone and the outer cone until the special taper surface of the special taper hole is embraced with the taper surface of the bidirectional cone frustum to realize self-positioning or until the sizing interference contact generates self-locking, thereby forming a special synthesis technology of a cone pair and a thread pair, ensuring the efficiency and reliability of a taper thread technology, in particular a connection structure of the bidirectional taper external thread and the traditional thread, therefore, the technical performances of connection, locking, looseness prevention, bearing, fatigue, sealing and the like of the mechanical mechanism are realized.

Therefore, the technical performances of the bidirectional conical external thread, such as high transmission precision efficiency, low bearing capacity, self-locking force, high anti-loosening capacity, good sealing performance and the like of the traditional thread are related to the first spiral conical surface of the conical frustum body, the left side conical degree formed by the first spiral conical surface, namely the first conical angle alpha 1, the second spiral conical surface of the conical frustum body, the right side conical degree formed by the second spiral conical surface of the conical frustum body, namely the second conical angle alpha 2, and the special internal conical surface of the traditional internal thread formed by the contact of the traditional internal thread and the bidirectional conical external thread and the conical 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.

In the connecting structure of the symmetrical bidirectional tapered thread external thread and the traditional thread, when the right-angle trapezoidal combination body rotates at a constant speed for one circle, the axial moving distance of the right-angle trapezoidal combination body is at least one time of the length of the sum of the right-angle sides of two same right-angle trapezoids. The structure ensures that the first spiral conical surface of the truncated cone body and the second spiral conical surface of the truncated cone body 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 special conical surface of the traditional internal thread special conical hole.

In the connecting structure of the symmetrical bidirectional tapered thread external thread and the traditional thread, when the right-angle trapezoidal combination body rotates at a constant speed for one circle, the axial moving distance of the right-angle trapezoidal combination body is equal to the length of the sum of the right-angle sides of two same right-angle trapezoids. The structure ensures that the first spiral conical surface of the truncated cone body and the second spiral conical surface of the truncated cone body 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 special conical surface of the traditional internal thread special conical hole.

The bidirectional conical external thread and the traditional thread are characterized in that 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 special conical surface of the special conical hole is a continuous helical surface or a discontinuous helical surface.

In the bidirectional conical external thread and the traditional thread, one end and/or two ends of the columnar parent body can be screwed in the screwing-in end of the connecting hole of the tubular parent body, and the thread connection function is realized through the contact and/or interference fit of the special conical surface of the traditional internal thread and the first spiral conical surface of the conical external thread frustum and/or the contact and/or interference fit of the special conical surface of the traditional internal thread and the second spiral conical surface of the conical external thread frustum.

In the bidirectional tapered external thread and the traditional thread, one end of the columnar parent body is provided with a head part with the 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 the diameter smaller than the bidirectional tapered external thread of the threaded rod body of the columnar parent body, and the connecting hole is a threaded hole arranged on the nut. The columnar parent body and the head are connected into a bolt, the bolt is not provided with the head or the heads at two ends are smaller than the small diameter of the bidirectional conical external thread or the double-screw bolt is provided with the bidirectional conical external thread at two ends respectively without the thread at the middle, and the connecting hole is arranged in the nut.

Compared with the prior art, the connecting structure of the bidirectional conical external thread and the traditional thread 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 structural view of a pair of external threads of the dumbbell-like symmetric bidirectional tapered threads and a conventional threaded connection according to a first embodiment of the present invention.

Fig. 2 is a schematic view of a dumbbell-like symmetric bidirectional tapered thread external thread and a complete unit body thread structure thereof according to a first embodiment of the present invention.

Fig. 3 is a schematic view of a connection structure between the dumbbell-like symmetrical two-way tapered threaded bolt of the second embodiment of the present invention and a conventional threaded double nut.

Fig. 4 is a schematic view of a connection structure between the dumbbell-like symmetrical bidirectional tapered threaded bolt according to the third embodiment of the present invention and the conventional threaded single nut.

Fig. 5 is a schematic view of a connection structure between the dumbbell-like symmetrical two-way tapered threaded bolt of the fourth embodiment and the conventional threaded double nut.

Fig. 6 is a schematic view of a connection structure between the dumbbell-like symmetrical two-way tapered threaded bolt of the fifth embodiment of the present invention and a conventional threaded double nut (with a gasket in the middle).

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 figure, a tapered thread 1, a cylindrical parent body 2, a nut body 21, a nut body 22, a columnar parent body 3, a screw body 31, a tapered hole 4, a tapered hole conical surface 42, an internal thread 6, a truncated cone 7, a bidirectional truncated cone 71, a bidirectional truncated cone conical surface 72, a truncated cone first spiral conical surface 721, a first taper angle α 1, a truncated cone second spiral conical surface 722, a second taper angle α 2, an external spiral line 8, an external thread 9, a dumbbell-like shape 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 tapered thread support surface 121, a workpiece 130, a nut body lock direction 131, a gasket 132, a tapered axis 01, a thread axis 02, a slider a on a slope body, a body B, a taper body taper, Gravity G, gravity along slope component G1, friction force F, thread lead angle phi, equivalent friction angle P, traditional external thread large diameter d, traditional external thread small diameter d1 and traditional external thread medium 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 and fig. 2, the present embodiment adopts a connection structure of a symmetrical bidirectional tapered external thread 9 and a conventional internal thread 6, and the bidirectional tapered external thread and conventional threaded connection pair 10 includes a bidirectional frustum 71 spirally distributed on the outer surface of the cylindrical parent body 3 and a special tapered hole 4 spirally distributed on the inner surface of the cylindrical parent body 2 formed by the conventional internal thread 6 contacting with the bidirectional tapered external thread 9, including the external screw thread 9 and the internal thread 6 of screw-thread fit each other, what the internal thread 6 distributes is that be spiral helicine special taper hole 4, what the external thread 9 distributes is that be spiral helicine two-way frustum 71, the internal thread 6 exists with being spiral helicine special taper hole 4 and with "non-entity space" form, the external thread 9 exists with being spiral helicine two-way frustum 71 and with "material entity" form, internal thread 6 and external thread 9 are the relation of containing piece and contained piece: the internal thread 6 and the external thread 9 are sleeved together in a one-section-by-one rotary mode until the internal thread is in interference fit, namely the traditional internal thread 6 is used for containing the bidirectional frustum body 71 in a one-section-by-one mode in the special conical hole 4 formed by contacting with the bidirectional conical external thread 9, namely the internal thread 6 is used for containing the external thread 9 in a one-section-by-one mode, the disordered freedom degree between the traditional internal thread 6 special conical hole 4 and the frustum body 7 is limited in a two-way mode, the spiral motion enables the bidirectional conical external thread and the traditional threaded connection pair 10 to obtain the necessary ordered freedom degree, and the technical characteristics of a conical pair and a threaded pair are effectively synthesized.

The bidirectional conical external thread and the traditional thread connection pair 10 in the embodiment are matched with the bidirectional conical frustum conical surface 72 and the special conical hole conical surface 42 of the special conical hole 4 of the traditional internal thread 6 when in use. The bidirectional tapered external thread and the circular cone table body 7 of the traditional threaded connection pair 10 are formed to reach a certain taper, namely, the circular cone reaches a certain taper angle, the threaded connection pair 10 has self-locking and self-positioning properties, the taper comprises a left taper 95 and a right taper 96, the taper angle comprises a left taper angle and a right taper angle, the left taper 95 corresponds to the left taper angle, namely, a first taper angle alpha 1, preferably, the angle is more than 0 degree and less than 53 degrees, and preferably, the value of 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 internal thread 6 is arranged on the inner surface of the cylindrical parent body 2, and is characterized in that the cylindrical parent body 2 comprises a nut body 21, the inner surface of the nut body 21 is provided with a traditional internal thread 6, the traditional internal thread 6 comprises a triangular thread, a trapezoidal thread, a sawtooth thread and the like, which can be screwed with the bidirectional conical thread 1 to form other geometrical threads of the threaded connection pair 10, when the traditional internal thread 6 is matched with the bidirectional conical external thread 9 to form the threaded connection pair 10, the traditional internal thread 6 is not a traditional thread in the original sense but a special conical thread 1, the contact part of the special internal thread 1 and the bidirectional conical external thread 9 forms a special conical hole 4 of the traditional internal thread 6 of the threaded connection pair 10, the special conical hole 4 is provided with a special conical hole surface 42, and the effective conical surface area of the special conical hole 42 on the special conical hole 4 of the traditional internal thread 6 can be continuously increased along with the increase of the number of screwing use The increase means that the special conical surface 42 of the conical hole is continuously enlarged and tends to have larger contact surface direction change with the conical surface of the bidirectional conical external thread 9, and a special conical hole 4 which has the technical spirit of the invention although the conical geometry is incomplete is formed substantially, the inner conical surface, namely the special conical surface 42 of the conical hole of the traditional internal thread 6 appears in a line shape firstly, the inner conical surface is gradually increased along with the increase of the contact use times of the tooth tip of the traditional internal thread 6 and the conical frustum 7 of the bidirectional conical external thread 9, namely the special conical surface 42 of the conical hole of the traditional internal thread 6 is continuously changed and enlarged from line to plane, and an inner conical surface matched with the bidirectional conical external thread 9 can also be directly processed at the tooth tip part of the traditional internal thread 6, these are in accordance with the technical spirit of the present invention, and the cylindrical parent body 2 includes a cylindrical body and/or a non-cylindrical body and the like which are/is a workpiece and an object to be internally threaded.

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

When the bidirectional tapered external thread is in transmission connection with a traditional thread, the bidirectional bearing is realized by screwing and connecting the special taper hole 4 of the traditional internal thread 6 with the bidirectional cone table body 71, when the external thread 9 and the internal thread 6 form a thread pair 10, a clearance 101 must be formed between the bidirectional cone table body 71 and the special taper hole 4 of the traditional internal thread 6, if oil and other media are lubricated between the internal thread 6 and the external thread 9, a bearing oil film is easily formed, the clearance 101 is favorable for forming the bearing oil film, the thread connection pair 10 is equivalent to a group of sliding bearing pairs consisting of one or more sliding bearings, namely, each section of the traditional internal thread 6 is bidirectionally accommodated and corresponds to one section of the bidirectional tapered external thread 9 to form one sliding bearing, the number of the formed sliding bearings is adjusted according to application conditions, namely, the effective bidirectional joint of the traditional internal thread 6 and the bidirectional tapered external thread 9, namely the number of the accommodated and accommodated thread sections in bidirectional contact clasping are effectively realized, according to the application working condition design, the bidirectional conical frustum body 7 is contained in the special conical hole 4 in a bidirectional mode, and the special conical hole 4 is located in multiple directions such as the radial direction, the axial direction, the angular direction and the circumferential direction, a special synthesis technology of a conical pair and a thread pair is formed, and the precision, the efficiency and the reliability of transmission connection of a conical thread technology, particularly a bidirectional conical external thread and a traditional thread are guaranteed.

The technical performance of the bidirectional conical external thread and the traditional thread is realized by screwing and connecting the traditional internal thread 6 special taper hole 4 and the bidirectional conical frustum body 71 when in fastening connection and sealing connection, namely the sizing of the first spiral conical surface 721 of the conical frustum body and the traditional internal thread 6 special taper hole 4 special taper hole conical surface 42 is realized until interference and/or the sizing of the second spiral conical surface 722 of the conical frustum body and the traditional internal thread 6 special taper hole 4 special taper hole conical surface 42 is realized until interference, according to the application working condition, one-direction bearing and/or two-direction simultaneous bearing are achieved, namely the bidirectional conical external thread 9 bidirectional conical frustum body 71 and the traditional internal thread 6 special taper hole 4 are guided by a spiral line, the inner cone and the outer cone inner and outer diameter are centered until the traditional internal thread 6 special taper hole 4 special taper hole conical surface 42 and the conical frustum body first spiral conical surface 721 are clasped until contact and/or the traditional internal thread 6 special taper hole conical surface 4 and the traditional internal cone conical surface 42 are clasped until interference and the traditional internal cone 6 special taper hole conical surface 42 are contacted and/or the traditional internal thread The special conical hole conical surface 42 of the special conical hole 4 with the lines 6 and the second spiral conical surface 722 of the cone frustum body are clasped until interference contact is achieved, and therefore the technical performances of connection, locking, looseness prevention, bearing, fatigue, sealing and the like of a mechanical mechanism are achieved.

Therefore, the technical performances of the bidirectional tapered external thread in this embodiment, such as transmission accuracy, high transmission efficiency, high bearing capacity, self-locking force, anti-loosening capacity, good sealing performance, reusability, etc., are related to the size of the first helical conical surface 721 of the frustum cone, the left-side taper 95 formed by the first conical surface, the first taper angle α 1, the second helical conical surface 722 of the frustum cone, the right-side taper 96 formed by the second conical surface, the second taper angle α 2, and the special tapered surface 42 of the special tapered hole 4 of the traditional internal thread 6 formed by contacting the bidirectional tapered external thread 9, and the taper of the special tapered hole 42 of the special tapered hole 4 of the traditional internal thread 6. 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.

When the right-angle trapezoid combination body rotates at a constant speed for one circle, the axial movement distance of the right-angle trapezoid combination body is at least one time of the length of the sum of the right-angle sides of two same right-angle trapezoids. This structure ensures that the frustum-conical body first helical conical surface 721 and the frustum-conical body second helical conical surface 722 have sufficient lengths to ensure that the bidirectional frustum-conical body conical surface 72 has sufficient effective contact area and strength and efficiency required for the screw motion when cooperating with the conventional internal thread 6 special taper hole 4 special taper hole conical surface 42.

When the right-angle trapezoid combination body rotates at a constant speed for one circle, the axial movement distance of the right-angle trapezoid combination body is equal to the sum of the right-angle sides of two same right-angle trapezoids. This structure ensures that the frustum-conical body first helical conical surface 721 and the frustum-conical body second helical conical surface 722 have sufficient lengths to ensure that the bidirectional frustum-conical body conical surface 72 has sufficient effective contact area and strength and efficiency required for the screw motion when cooperating with the conventional internal thread 6 special taper hole 4 special taper hole conical surface 42.

In the above-mentioned bidirectional tapered external thread and conventional thread, the frustum-conical first helical conical surface 721 and the frustum-conical second helical conical surface 722 are both continuous helical surfaces or non-continuous helical surfaces. In the bidirectional conical external thread and the traditional thread, one end and/or two ends of the columnar parent body 3 can be screwed into the screwing end of the connecting hole of the cylindrical parent body 2, and the connecting hole is a threaded hole arranged on the nut body 21. One end of the columnar parent body 3 is provided with a head part with the size larger than the outer diameter of the columnar parent body 3 and/or one end and/or two ends of the columnar parent body 3 are/is provided with a head part with the diameter smaller than the outer thread 9 of the screw rod body 31 of the columnar parent body 3, namely the columnar parent body 3 and the head part are connected into a bolt, and the bolt without the head part and/or the head parts at the two ends smaller than the diameter of the outer thread 9 and/or the bolt without the screw thread at the middle part and with the outer threads 9 at the two ends is provided. Compared with the prior art, the bidirectional conical external thread and the traditional thread connection pair 10 have 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. 3, 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 connection structure of a symmetrical bidirectional tapered external thread 9 bolt and a conventional internal thread 6 double nut, where the double nut includes a nut body 21 and a nut body 22, the nut body 21 is located on the left side of the fastened workpiece 130, and the nut body 22 is located on the right side of the fastened workpiece 130, and when the connection structure of the bolt and the double nut works, the connection structure of the present embodiment is in rigid connection with the fastened workpiece 130, where the rigid connection refers to a connection structure where a nut end surface bearing surface and a workpiece 130 bearing surface are bearing surfaces, including a locking bearing surface 111 and a locking bearing surface 112, and the workpiece 130 refers to a connected object including the workpiece 130.

The thread working support surfaces of the present embodiment are different and include a tapered thread support surface 121 and a tapered thread support surface 122, when the cylindrical parent body 2 is located on the left side of the fastened workpiece 130, i.e., the left end surface of the fastened workpiece 130, and the cylindrical parent body 2, i.e., the right end surface of the left nut body 21, is the left nut body 21 and the fastening support surface 111 of the fastened workpiece 130, the left-side spiral conical surface of the cylindrical parent body 3, i.e., the bolt body 31, i.e., the bolt bidirectional conical thread 1, is the thread working support surface, i.e., the tapered thread support surface 122, i.e., the conventional internal thread 6 special tapered bore conical surface 42 and the tapered external thread 9 conical frustum first spiral conical surface 721 are the tapered thread support surfaces 122 and the conventional internal thread 6 special tapered bore conical surface 42 and the conical frustum first spiral conical surface 721 are each other, and when the cylindrical parent body 2 is located on the right side of the fastened workpiece 130, that is, when the right end surface of the workpiece 130 to be fastened and the left end surface of the right nut body 22, which is the cylindrical parent body 2, are the right nut body 22 and the lock support surface 112 of the workpiece 130 to be fastened, the right spiral conical surface of the bolt bidirectional tapered thread 1, which is the threaded body 31, which is the cylindrical parent body 3, is the thread work support surface, that is, the tapered thread support surface 121 is the thread work support surface, that is, the conventional internal thread 6 special tapered bore conical surface 42 and the tapered external thread 9 frustum second spiral conical surface 722 are the tapered thread support surface 121, and the conventional internal thread 6 special tapered bore conical surface 42 and the tapered frustum second spiral conical surface 722 are support surfaces for each other.

The connecting holes are arranged in the nut body 21 and the nut body 22.

EXAMPLE III

As shown in fig. 4, the structure, principle and implementation steps of the present embodiment are similar to those of the first embodiment and the second embodiment, except that the present embodiment adopts a connection structure of a bidirectional tapered threaded bolt and a conventional threaded single nut, and the bolt body has a hexagonal head larger than the bolt body 31, when the bolt hexagonal head is located on the left side, the cylindrical parent body 2, i.e., the nut body 21, i.e., the single nut, is located on the right side of the workpiece 130 to be fastened, and when the connection structure of the bolt and the single nut operates, the relationship between the bolt and the workpiece 130 to be fastened is rigid connection, the rigid connection means that the end surface of the nut body 21 and the opposite end surface of the workpiece 130 are bearing surfaces, the bearing surfaces are locking bearing surfaces 111, and the workpiece 130 refers to the object to be connected including the workpiece 130.

The thread working support surface of the present embodiment is a tapered thread support surface 122, that is, the cylindrical parent body 2, that is, the nut body 21, that is, the single nut, is located on the right side of the fastened workpiece 130, when the bolt and single nut connection structure works, the right end surface of the workpiece 130 and the left end surface of the nut body 21 are the nut body 21 and the locking support surface 111 of the fastened workpiece 130, the right spiral conical surface of the cylindrical parent body 3, that is, the bolt body 31, that is, the bolt bidirectional tapered thread 1 is a thread working support surface, that is, the tapered thread support surface 122 is a bidirectional tapered thread 1 working support surface, that is, the conventional internal thread 6 special tapered bore conical surface 42 and the tapered external thread 9 conical frustum second spiral conical surface 722 are tapered thread support surfaces 122, and the conventional internal thread 6 special tapered bore conical surface 42 and the conical frustum 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 four

As shown in fig. 5, the structure, principle and implementation steps of the present embodiment are similar to those of the first and second embodiments, except that the double nuts are different from the fastened workpiece 130 in the positional relationship, the double nuts comprise nut bodies 21 and 22, the bolt bodies are provided with hexagonal heads larger than the bolt body 31, when the hexagonal head of the bolt is positioned at the left side, the nut body 21 and the nut body 22 are both positioned at the right side of the workpiece 130 to be fastened, and the bolt and double nut connecting structure of the present embodiment works, the relationship between the nut body 21, the nut body 22 and the fastened workpiece 130 is a non-rigid connection, the non-rigid connection means that the end surfaces of the opposite side surfaces of the nut body 21 and the nut body 22 which are two nuts are mutually supporting surfaces, the bearing surfaces comprise a locking bearing surface 111 and a locking bearing surface 112, and are mainly applied to the application fields of non-rigid connecting workpieces 130 such as non-rigid materials or transmission parts, and the like, or the application fields of meeting requirements through double nut installation, and the like. The workpiece 130 refers to a connected object including the workpiece 130.

The thread working support surfaces of the present embodiment are different, and include a tapered thread support surface 121 and a tapered thread support surface 122, the cylindrical parent body 2 includes a left nut body 21 and a right nut body 22, the right end surface of the left nut body 21, i.e. the locking support surface 111, and the left end surface of the right nut body 22, i.e. the locking support surface 112, are in direct contact with each other and are locking support surfaces, when the right end surface of the left nut body 21 is the locking support surface 111, the left helical conical surface of the cylindrical parent body 3, i.e. the bolt body 31, i.e. the bolt bidirectional tapered thread 1, is a thread working support surface, i.e. the tapered thread support surface 122, i.e. the conventional internal thread 6 special tapered bore conical surface 42 and the tapered external thread 9 conical body first helical conical surface 721 are tapered thread support surfaces 122 and the conventional internal thread 6 special tapered bore conical surface 42 and the conical body first helical conical surface 721 are support surfaces, when the left end surface of the right nut body 22 is the locking support surface 112, the right spiral conical surface of the cylindrical parent body 3, i.e., the bolt body 31, i.e., the bolt bidirectional tapered thread 1, is a thread working support surface, i.e., the tapered thread support surface 121 is a thread working support surface, i.e., the conventional internal thread 6 special tapered bore conical surface 42 and the tapered external thread 9 frustum second spiral conical surface 722 are tapered thread support surfaces 121, and the conventional internal thread 6 special tapered bore conical surface 42 and the tapered frustum second spiral conical surface 722 are support surfaces for each other.

In this embodiment, when the cylindrical parent body 2 located at the inner side, i.e., the 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 threaded connection pair 10, effectively clasped together, the cylindrical parent body 2 located at the outer side, i.e., the 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 two nuts to ensure the reliability of the connection technology, etc.), the removed nut body 22 is not used as a connection nut but used as an installation process nut, and the installation process nut internal thread may be manufactured by using not only the conventional thread, but also the nut body 22 manufactured by using a bidirectional tapered thread and a unidirectional tapered thread capable of being screwed with the bolt thread, the threaded connection pair 10 is a closed-loop fastening technology system, namely the threaded connection pair 10 is an independent technology system after the internal thread 6 and the external thread 9 of the threaded connection pair 10 are effectively locked together, and the technical effectiveness of the connection technology system is ensured without depending on the technical compensation of the third person, namely the effectiveness of the threaded connection pair 10 is not influenced even if no other objects are supported, including a gap between the threaded connection pair 10 and the fastened workpiece 130, the method is favorable for greatly reducing the weight of the equipment, removing ineffective load, improving the technical requirements of the equipment on effective load capacity, braking performance, energy conservation, emission reduction and the like, this is a thread technical advantage that is unique to the threaded connection pair 10 of the present connection structure of the bidirectional tapered external thread and the conventional thread in relation to the workpiece 130 to be fastened whether it is a non-rigid connection or a rigid connection, but not possessed by other thread techniques.

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

EXAMPLE five

As shown in fig. 6, the structure, principle and implementation steps of the present embodiment are similar to those of the first and fourth embodiments, except that in the present embodiment, a spacer such as a gasket 132 is added between the nut body 21 and the nut body 22, that is, the right end surface of the left nut body 21 and the left end surface of the right nut body 22 are in indirect contact with each other through the gasket 132, so that the relationship between the right end surface of the left nut body 21 and the left end surface of the right nut body 22, which are indirectly locking support surfaces, is changed from the original direct locking support surfaces to the original indirect locking support 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, nut body 21, nut body 22, cylindrical parent body 3, screw body 31, tapered bore 4, tapered bore conical surface 42, internal thread 6, frustoconical body 7, bidirectional frustoconical body 71, bidirectional frustoconical body conical surface 72, frustoconical body first helical conical surface 721, first taper angle α 1, frustoconical body second helical conical surface 722, second taper angle α 2, external spiral line 8, external thread 9, quasi-annular 94, left side taper 95, right side taper 96, left side distribution 97, right side distribution 98, threaded connection pair and/or threaded pair 10, play 101, self-locking, self-positioning, pressure, conical axis 01, threaded axis 02, mirror image, sleeve, shaft, single cone, double cone, internal dumbbell, tapered bore, external, cone, conical pair cone, internal cone, tapered bore, external cone, and cone, Screw structure, screw motion, screw body, complete unit body thread, axial force angle, counter axial force angle, centripetal 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-physical space, material entity, workpiece 130, nut body lock direction 131, non-rigid connection, non-rigid material, transmission member, washer 132, and the like, but does not exclude the possibility of using other terms, which terms are used only for the purpose of more conveniently describing and explaining the essence of the present invention, and they are to be construed as being against the spirit of the present invention in any additional restriction.

Claims (10)

1. A connection structure of dumbbell-like symmetrical two-way tapered thread external threads and traditional threads comprises internal threads (6) and external threads (9) which are in thread fit with each other, and is characterized in that the complete unit body threads of the external threads (9) are dumbbell-like symmetrical two-way frustum bodies (71) which are spiral, small in the middle and large at two ends, the external thread (9) thread bodies are spiral two-way frustum bodies (71) on the outer surface of a cylindrical parent body (3), the internal thread (6) thread bodies are spiral tapered holes (4) formed by the traditional thread tooth bodies on the inner surface of the cylindrical parent body (2) and the external threads (9) in a contact manner, a left side conical surface of the external threads (9) forms a left side conical degree (95) corresponding to a first conical degree alpha 1, a right side conical degree forms a right side conical degree (96) corresponding to a right side conical degree alpha 2, the left side conical degree (95) and the right side conical degree (96) are opposite in direction and have the same or approximately the same degree, the internal thread (6) and the external thread (9) are contained into a cone through a taper hole until the internal and external conical surfaces are mutually loaded, wherein the angle alpha 1 is more than 0 degree and less than 53 degrees, the 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 connection structure of the external thread of the dumbbell-like symmetrical bidirectional tapered thread and the traditional thread according to claim 1, it is characterized in that the external thread (9) comprises a left side conical surface, namely a first spiral conical surface (721) of the truncated cone, and a right side conical surface, namely a second spiral conical surface (722) of the truncated cone, of the conical surface (72) of the bidirectional truncated cone, and an external spiral line (8), the shapes formed by the first spiral conical surface (721) of the truncated cone and the second spiral conical surface (722) of the truncated cone are bidirectional spiral conical surfaces, the right-angle sides of the right-angle trapezoid combination bodies which are symmetrical and oppositely jointed with the upper hemlines of the two same right-angle trapezoids superposed on the central axis of the columnar parent body (3) are taken as the rotation center, the rotation is carried out at a uniform speed in the circumferential direction, and the right-angle trapezoid combination bodies simultaneously move axially at a uniform speed along the central axis of the columnar parent body (3), and the spiral outer side surface of the revolution body formed by two bevel edges of the right-angle trapezoidal combination body has the same shape.

3. The connection structure of external threads of the dumbbell-like symmetrical bidirectional tapered threads and the conventional threads as claimed in claim 2, wherein the axial movement distance of the right-angled trapezoidal combined body is at least one time as long as the sum of the right-angled sides of the two right-angled trapezoidal combined bodies when the right-angled trapezoidal combined body rotates at a constant speed for one circle.

4. The connection structure of external threads of the dumbbell-like symmetrical bidirectional tapered threads and the conventional threads as claimed in claim 2, wherein the axial movement distance of the right-angled trapezoidal combined body is equal to the sum of the right-angled sides of the right-angled trapezoidal combined body when the right-angled trapezoidal combined body rotates at a constant speed for one circle.

5. The connection structure of external threads of dumbbell-like symmetrical bi-directional tapered threads according to claim 2, wherein the left and right conical surfaces of the external threads (9), i.e. the first helical conical surface (721) of the frustum cone, the second helical conical surface (722) of the frustum cone and the external spiral line (8), are continuous helical surfaces or non-continuous helical surfaces; the conical hole (4) is provided with a conical hole conical surface (42), and the conical hole conical surface (42) is a continuous spiral surface or a non-continuous spiral surface.

6. The connection structure of external thread of dumbbell-like symmetrical two-way taper thread and traditional thread according to claim 1, characterized in that the external thread (9) is formed by the upper top surfaces of two identical frustum cone bodies (7) being symmetrical and joined to each other, and the lower bottom surfaces being at the two ends of the frustum cone body (71), and when the symmetrical two-way taper thread (1) of dumbbell-like (94) is formed, the external thread of dumbbell-like (94) symmetrical two-way taper thread is formed by joining the lower bottom surfaces of the adjacent frustum cone bodies (71) to each other, and/or joining the lower bottom surfaces of the adjacent frustum cone bodies (71) to each other.

7. The connection structure of external threads of dumbbell-like symmetrical bi-directional tapered threads according to claim 1 or 6, wherein the conventional threads include any one of triangular threads, trapezoidal threads, zigzag threads, rectangular threads, and circular arc threads, and the conventional threads include conventional threads adapted to the conventional threads and include conventional threads having deformed thread bodies, i.e., tooth bodies.

8. The connection structure of external thread and conventional thread with dumbbell-like symmetrical bi-directional taper according to claim 1, characterized in that the external thread (9) has the capability of assimilating the internal thread (6), and comprises that the single thread body is an incomplete taper geometry body, i.e. the single thread body is an incomplete unit body thread, the internal thread (6) assimilated by the single thread body is a dissimilatory conventional thread, i.e. the thread body is a taper thread (1), the internal thread (6) and the external thread (9) form a thread connection pair (10), the screw connection pair (10) is formed by the mutual matching of a spiral bi-directional frustum body (71) and a spiral taper hole (4), and the taper hole conical surface (42), a first spiral taper surface (721) of the frustum cone and a second spiral taper surface (722) of the frustum cone are supported by contact surfaces, and/or the inner diameter and the outer diameter of the inner cone and the outer cone are centered under the guidance of the spiral line until the conical surface (72) of the bidirectional truncated cone body is in self-positioning contact with the conical surface (42) of the conical hole and/or self-locking is generated.

9. The connection structure of external threads of dumbbell-like symmetrical bidirectional tapered threads and traditional threads according to claim 1, characterized in that when one cylindrical parent body (2) has been effectively combined with the cylindrical parent body (3), the internal threads (6) and the external threads (9) which form the threaded connection pair (10) are effectively clasped together, and the other cylindrical parent body is removed or retained, and the removed cylindrical parent body is used as a nut for installation process, and the internal threads comprise traditional threads, or are made of unidirectional tapered threads and bidirectional tapered threads (1) which can be screwed with the cylindrical parent body (3).

10. A connection structure between external threads of a dumbbell-like symmetrical bi-directional cone and conventional threads according to claim 1, characterized in that said cylindrical matrix (3) is solid or hollow, comprising cylindrical and/or non-cylindrical workpieces and objects requiring the machining of external bi-directional cone threads (9) on its external surface, said external surface comprising the geometry of a cylindrical surface and/or a non-cylindrical surface comprising a conical surface.

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