CN210318131U

CN210318131U - Self-tightening bolt or stud and nut fastening device

Info

Publication number: CN210318131U
Application number: CN201920519504.2U
Authority: CN
Inventors: 朱振武; 朱志胤
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-04-17
Filing date: 2019-04-17
Publication date: 2020-04-14
Anticipated expiration: 2029-04-17

Abstract

A self-tightening bolt, nut tightening device or a self-tightening stud, nut tightening device, comprising: bolts and nuts. The bolt includes: bolt main part, bolt head, tightening part. This self-clinching stud, nut fastener includes: studs and nuts; the nut is assembled with the stud through a threaded structure; the stud includes: the bolt comprises a bolt main body, a tightening part and an external thread structure; the tightening part includes: outward warping body and deformation pretension seam. The tightening part is divided into a plurality of outward warping bodies by deformation pretension seams. The nut further comprises a sealed dustproof cover, and locking barbs are arranged in the sealed dustproof cover. The utility model provides a scheme can be through the outer body of perk in the portion of screwing up for the nut makes the nut continuously receive the power along nut assembly income bolt or bolt direction after screw in bolt or bolt, thereby reaches in the vibration process, and the self-tightening effect of nut improves fastener's durability.

Description

Self-tightening bolt or stud and nut fastening device

Technical Field

The utility model relates to a fastener, concretely relates to bolt, nut fastener or from tight double-screw bolt, nut fastener belong to general machinery technical field.

Background

With the vigorous development of mechanical devices in China, mechanical mechanisms in a plurality of mechanical devices need to be assembled in a replaceable mode. The bolt and the nut are the most widely used detachable fastening devices. The application of the detachable fastening device can greatly reduce the production difficulty of the mechanical device and improve the repair efficiency of the mechanical device.

In practical application, a plurality of high-frequency vibration working conditions exist in the use scene of the bolt and nut fastening device, and the common bolt and nut device can be loosened under the high-frequency vibration working condition, particularly when being applied to a high-speed railway body. It causes great hidden trouble to the production construction.

In order to solve the technical problem, in the prior art, the following methods are generally adopted to perform self-locking on the bolt and nut fastening device. Such as: shortening the thread pitch of the bolt thread, matching and self-locking double nuts, tightly pushing a spring gasket, welding the nut, destroying the screw thread screwed out of the nut and the like. The practical use condition shows that bolt screw thread pitch shortens, two nut cooperation auto-locks, spring shim top are tight, do to have certain locking efficiency, but when meetting the operating mode that vibration frequency is high and the period is long, the bolt nut will produce not hard up certainly. And the nut welds up, destroys the scheme such as nut back-out screw thread, when meetting to dismantle mechanical device, needs to cut off the nut earlier, and the bolt is taken off in the pine again, can greatly influence work efficiency and cause unnecessary waste.

Therefore, how to provide a bolt and nut fastening device or a self-tightening stud and nut fastening device, under the working condition of high-frequency vibration, the more the bolt and nut fastening device vibrates, the more the bolt and nut fastening device is fastened, and therefore the effect of preventing looseness is achieved. Is the research direction of the prior art personnel.

SUMMERY OF THE UTILITY MODEL

To the not enough of above-mentioned prior art, the utility model discloses an aim at is through the outer body of perk in bolt or double-screw bolt portion of screwing up for the nut is after screw in bolt or double-screw bolt, continuously receives the power along nut assembly income bolt or double-screw bolt direction, thereby reaches in the vibration process, the more and more tight self-tightening effect of nut. The utility model provides a from tight bolt, nut fastener or from tight double-screw bolt, nut fastener, this from tight bolt, nut fastener include: bolts and nuts. The bolt includes: bolt main part, bolt head, tightening part. This self-clinching stud, nut fastener includes: studs and nuts; the nut is assembled with the stud through a threaded structure; the stud includes: the bolt comprises a bolt main body, a tightening part and an external thread structure; the tightening part includes: outward warping body and deformation pretension seam. The tightening part is divided into a plurality of outward warping bodies by deformation pretension seams. The outer warping body is provided with an external thread. The parts of the outward warping body close to one end of the bolt head are tightly attached to each other. The parts of the raised bodies far away from one end of the bolt head are separated from each other.

According to the utility model discloses a first embodiment provides a self-tightening bolt, nut fastener:

a self-tightening bolt and nut tightening device, comprising: bolts and nuts; the nut is assembled with the bolt through a thread structure; the bolt includes: the bolt comprises a bolt main body, a bolt head, a tightening part and an external thread structure; the bolt head is arranged at one end of the bolt main body; the tightening part is arranged at the other end of the bolt main body; the external thread structure is arranged on the outer surface of the tightening part; the nut includes: the nut comprises a nut body, a nut through hole and an internal thread structure; the nut through hole is arranged on the nut main body; the internal thread structure is arranged on the inner wall of the nut through hole; the tightening part includes: outward warping body and deformation pretension seam; the tightening part is divided into a plurality of outward warping bodies by the deformation pretension seams; the periphery of the outward warping body is provided with an external thread structure; the parts of the outward warping body, which are close to one end of the bolt head, are tightly attached to each other; the parts of the outward warping body, which are far away from one end of the bolt head, are separated from each other; the diameter of the external thread structure on the end, close to the bolt head, of the outward warping body is D1, and the diameter of the external thread structure on the end, far away from the bolt head, of the outward warping body is D2; d2> D1; the diameter of the external thread structure on the outward warping body is gradually increased from D1 at one end to D2 at the other end.

Preferably, the inner diameter of one end of the internal thread structure is D5, and the inner diameter of the other end of the internal thread structure is D6; and D5> D6; the internal diameter of the internal thread structure is gradually reduced from D5 at one end to D6 at the other end.

Preferably, the inner diameter of both ends of the internal thread structure is D5, and the inner diameter of the middle section of the internal thread structure is D6; and D5> D6; the inner diameter of the internal thread structure is gradually reduced from D5 at one end to D6 at the middle part and gradually increased from D6 at the middle part to D5 at the other end.

Preferably, the tightening part further includes: an installation guide head arranged on the end surface of the tightening part; the installation guide head is coaxial with the tightening part; the installation guide head and the connected outward warping body are separated by a deformation pretension seam; the diameter of the installation guide head after separation is D7; d7 is not less than D1.

Preferably, one end of the bolt head far away from the bolt body is provided with a locking groove. The locking groove is arranged at the position of the deformation pretension seam.

Preferably, the tightening part further includes: a torsion limiting column; the torsion limiting column is arranged in the center of the tightening part, and the deformation pretension seam is arranged between the outward warping body and the torsion limiting column; the outward warping body is clung to the torsion limiting column after being gathered.

Preferably, the torsion limiting column is a polygonal prism; more preferably a regular polygonal prism.

Preferably, the axis of the outward warping body and the central axis of the tightening part are in the same plane.

Preferably, the outward warping body is spirally arranged around a central axis of the tightening portion, and the spiral direction of the outward warping body is opposite to the spiral direction of the external thread structure.

Preferably, the end part of the external thread structure and/or the installation guide head is provided with a chamfer; preferably, two ends of the nut through hole are provided with chamfers.

Preferably, the nut further comprises a sealing dustproof cover, the sealing dustproof cover is connected with one end of the nut body, and the nut is of a concave structure or a U-shaped structure. And a locking barb is arranged in the sealed dustproof cover.

Preferably, the deformed pre-tension seam is a straight line or a curve, and the width of the deformed pre-tension seam is 0.01-50mm, preferably 0.02-30mm, and more preferably 0.03-20 mm; the width of the deformation pretension slot gradually becomes wider from one end close to the bolt head to one end far away from the bolt head.

Preferably, the tightening part is divided into 2-10 outward tilted bodies by the deformation pretension seam, preferably 3-8 outward tilted bodies, and more preferably 4-6 outward tilted bodies.

Preferably, the tightening part is made of elastic steel material; preferably, the self-tightening bolt and the nut fastening device are both made of elastic steel materials.

In a first embodiment, the bolt and nut are fit-fitted by a threaded structure. The bolt tightening part is provided with an outward warping body. The outward warping body is warped outwards along the radial direction of the cross section circle of the central axis of the vertical bolt. Namely, the outer end parts of the outward warping bodies are separated from each other, and the inner end parts of the outward warping bodies are connected with the bolt main body. I.e., D2> D1. After the nut and the bolt are assembled, the outward warping body is folded towards the central axis of the bolt under the action of the nut, and the outward warping body is still in a warping state. Meanwhile, the outward warping body has a movement tendency of recovering the original shape, namely, a movement tendency of outward warping. The acting force of the outward warping body on the nut comprises: the component force radially outwards along the section circle of the central axis of the vertical bolt and the force along the direction that the nut is installed into the bolt. When the self-tightening bolt and nut fastening device is used, the component force of the nut, which is radially outward along the section circle of the central axis of the vertical bolt, increases the pressing force of the external thread structure of the bolt and the internal thread structure of the nut, so that the friction force for blocking the relative rotation between the nut and the bolt is improved. Thereby playing a role of preventing loosening. During the vibration process of the self-tightening bolt and nut fastening device, the force applied to the nut along the direction of installing the nut into the bolt can make the nut continue to move towards the direction of installing the bolt. The self-tightening bolt and nut fastening device has the advantages that the nut and the bolt are tightened more and more under the vibration working condition, and the self-tightening effect is achieved.

The outer end of the outward warping body is a part of the outward warping body far away from one end of the bolt head, and the inner end of the outward warping body is a part of the outward warping body close to one end of the bolt head.

It should be further noted that the outward tilted body tilts outward at a certain angle, which does not affect the assembly of the nut. When the nut is assembled into the bolt, the outer warping body is still in a slightly warped state; namely, the outward warping body continuously applies force to the nut along the direction that the nut is installed into the bolt.

When the nut needs to be removed, the fastening device can be loosened by only rotating the nut or the bolt, and the nut continues to rotate until the nut is removed.

In the first embodiment, an example of the internal thread structure of the nut is such that the internal diameter of one end of the internal thread structure is larger than that of the other end of the internal thread structure, and the internal diameter of the internal thread structure gradually decreases from the end having a large diameter to a small transition. The transition process can be linear or arc. The design that the internal thread structure is from big to small can make the nut assemble in the bolt better.

In the first embodiment, another example of the internal thread structure of the nut is that the internal diameters of both ends of the internal thread structure are larger than the internal diameter of the middle portion of the internal thread structure, and the internal diameter of the internal thread structure gradually decreases from one end portion with a large diameter to transition to the middle portion with a small diameter, and gradually increases from the middle portion with a small diameter to transition to the other end portion with a large diameter. The transition process can be linear or arc. The diameter of the internal thread structure is designed from big to small and then big, so that the front and back surfaces of the nut can be conveniently assembled into the bolt, and the working efficiency is improved.

In a first embodiment, the tightening part further comprises a mounting guide head. The diameter of installation guide head is less than the diameter of external screw thread structure, and it can the better bolt hole that passes of guide bolt, improves work efficiency.

In a first embodiment, the tightening part further comprises: a torsion limiting column. After the outer warping body is separated from the deformation pretension seam in the tightening part, a torsion limiting column is arranged at the axis and is not provided with threads. The torsion limiting column does not deflect towards any direction. The outward warping body is stressed to gather inwards and then is combined with the torsion limiting column to form the shape of a normal bolt. The torsion limiting column is a polygonal prism, and the torsion limiting column is abutted to the outward warping body in the process of assembling the bolt and the nut, the edge surface of the torsion limiting column provides circumferential supporting force for the outward warping body, and the outward warping body is prevented from being deformed and damaged in the assembling process.

In a first embodiment, the torsion restraint posts are preferably regular polygonal prisms.

It should be noted that the torque limiting column is similar to the end of the inner-angle screwdriver, for example, the pentagonal screwdriver is inserted into the inner-pentagonal bolt, and the protrusion of the pentagonal screwdriver drives the inner-pentagonal bolt to rotate circumferentially. And the utility model discloses in, the effect of the spacing post of torsion is for keeping the body of warping outward not relative bolt motion on the circumferencial direction.

It should be further explained that, the torque limiting column is a regular polygon, so that each outward warping body is uniformly stressed and is not easy to deform in the process of assembling the bolt and the nut.

In a first embodiment, the axis of the outward warping body refers to a geometric axis of the outward warping body, the geometric axis of the outward warping body and the central axis of the tightening part are in the same plane, and the outward warping body warps around the tightening part in the plane.

In a first embodiment, the outward warping body is spirally arranged around the central axis of the tightening part, and the spiral direction of the outward warping body is opposite to the spiral direction of the external thread structure. In this embodiment, if the screw directions of the bolt and the nut are both right-handed, the screw direction of the outward-warping body is left-handed. Seen in the direction in which the nut fits into the bolt. When the nut rotates clockwise relative to the bolt, the nut is in the motion process of screwing in the bolt. The nut will now give the outward warped body a circumferential force in the clockwise direction. The circumferential force is applied to the outward warping body in the left spiral direction, so that the outward warping body is close to the central axis of the tightening part. The circumferential force and the radial force given to the outward warping body by the nut enable the outward warping body to be close inwards. Thereby make the nut change the installation, improve work efficiency.

Conversely, when the nut is rotated counterclockwise relative to the bolt, the nut is in the process of unscrewing the bolt. The nut will now give the outward warped body a circumferential force in the counter clockwise direction. The circumferential force is applied to the outward warping body in the left spiral direction, so that the outward warping body is expanded back to the central axis of the tightening part. So that the supporting force between the outward warping body and the bolt is increased, and the friction force between the outward warping body and the bolt is improved. Thereby making the nut not easy to loosen and playing the role of preventing loosening.

In a first embodiment, the end of the external thread structure is provided with a chamfer, i.e. the outer end of the outward warping body is provided with a chamfer. The end of the installation guide head is provided with a chamfer. The nut positioning device is beneficial to positioning with the nut during assembly, and the working efficiency is improved.

In the first embodiment, chamfers are arranged at two ends of the through hole of the nut, so that the positioning of the nut and the bolt during assembly is facilitated, and the working efficiency is improved.

In the first embodiment, the sealing dustproof cover is arranged at one end of the nut and plays a dustproof role. In addition, a locking barb is arranged in the sealed dustproof cover. The locking barb is a conical structure, and one end of the conical top of the locking barb of the conical structure corresponds to the deformation pretension seam. The locking barb of the conical structure is of a conical structure, the conical bottom of the conical structure is connected with the sealing dustproof cover, and the conical top of the conical structure is arranged corresponding to the deformation tension seam, so that when the self-tightening bolt and nut fastening device of the utility model is used or the self-tightening stud and nut fastening device of the utility model is used, the nut is screwed up, and the deformation tension seam is compressed, so that the bolt or stud generates tension in the state, and the nut on the bolt or stud is prevented from loosening; in addition, the conical top part of the locking barb in the sealed dust cover is inserted into the deformation tension seam, the locking barb forces the outward warping body to separate, the tension of the outward warping body is further increased, and the generated tension and the force of the nut fastening bolt or the stud form a pile of acting force with opposite effects, so that the nut is further prevented from loosening.

In a first embodiment, the width of the deformed pre-tension slit varies with the degree of warpage of the warp body. And the end close to the bolt head is tightly attached with the outward warping body, so that the width of the deformed pre-tension seam is the minimum. At one end far away from the bolt head, the outward warping bodies mutually warp to the position farthest away from the axis in the tightening part, and the width of the deformation pre-tension seam is the largest. In the process of using the bolt, the outward warping body is extruded by external force to approach the axial line in the tightening part, and the width of the deformation pretension seam is reduced.

In a first embodiment, the tightening part is divided into a plurality of outward warping bodies by the deformation pretension seam, and the outward warping bodies are similar to the bolt in the prior art in appearance after being gathered under the action of external force.

In the first embodiment, the bolt is made of elastic steel materials, and the bolt has certain elasticity, so that the service life of the bolt is prolonged.

According to the utility model discloses a second embodiment provides a self-tightening double-screw bolt, nut fastener:

a self-tightening stud and nut fastening device, the device comprising: studs and nuts; the nut is assembled with the stud through a threaded structure; the stud includes: the bolt comprises a bolt main body, a tightening part and an external thread structure; the two ends of the stud main body are respectively and independently provided with the tightening parts; the external thread structure is arranged on the outer surface of the tightening part; the nut includes: the nut comprises a nut body, a nut through hole and an internal thread structure; the nut through hole is arranged on the nut main body; the internal thread structure is arranged on the inner wall of the nut through hole; the tightening part includes: outward warping body and deformation pretension seam; the tightening part is divided into a plurality of outward warping bodies by the deformation pretension seams; the periphery of the outward warping body is provided with an external thread structure; one ends of the outward warping bodies, which are close to the middle of the stud main body, are tightly attached to each other; one ends of the outward warping bodies, which are far away from the middle of the stud main body, are separated from each other; the diameter of the external thread structure on the outer warping body close to one end of the middle of the stud main body is D3, and the diameter of the external thread structure on the outer warping body far away from one end of the middle of the stud main body is D4; d4> D3; the diameter of the external thread structure on the outward warping body is gradually increased from D3 at one end to D4 at the other end.

Preferably, the tightening part further includes: an installation guide head arranged on the end surface of the tightening part; the installation guide head is coaxial with the tightening part; the installation guide head and the connected outward warping body are separated by a deformation pretension seam; the diameter of the installation guide head after separation is D7; d7 is not less than D3.

Preferably, the two ends of the stud body are provided with locking grooves. The locking groove is arranged at the position of the deformation pretension seam.

Preferably, the deformed pre-tension seam is a straight line or a curve, and the width of the deformed pre-tension seam is 0.01-50mm, preferably 0.02-30mm, and more preferably 0.03-20 mm; the width of the deformation pretension seam gradually becomes wider from one end close to the stud body to one end far away from the stud body.

In a second embodiment, the stud and nut are fit-mated by a threaded arrangement. The stud tightening part is provided with an outward warping body. The outward warping body is warped outwards along the radial direction of the cross section circle of the central axis of the vertical stud. Namely, the outer end parts of the outward warping bodies are separated from each other, and the inner end parts of the outward warping bodies are connected with the stud main body. I.e., D4> D3. After the nut and the stud are assembled, the outward warping body is folded towards the central axis of the stud under the action of the nut, and the outward warping body is still in a warping state. Meanwhile, the outward warping body has a movement tendency of recovering the original shape, namely, a movement tendency of outward warping. The acting force of the outward warping body on the nut comprises: the component force radially outwards along the section circle of the central axis of the stud and the force along the direction that the nut is installed into the stud. When the self-tightening stud and nut fastening device is used, the pressing force of the stud external thread structure and the nut internal thread structure is increased by the radially outward component force of the nut along the section circle perpendicular to the central axis of the stud, so that the friction force of relative rotation between the nut and the stud is improved. Thereby playing a role of preventing loosening. During the vibration process of the self-tightening stud and nut fastening device, the nut is subjected to force along the direction of installing the nut into the stud, so that the nut continues to move towards the direction of installing the stud. Namely, the self-tightening stud and the nut fastening device have the advantages that the nut and the stud are tightened more and more under the vibration working condition, and the self-tightening effect is achieved.

The outer end part of the outward warping body is a part of the outward warping body far away from the middle part of the stud main body, and the inner end part of the outward warping body is a part of the outward warping body close to the middle part of the stud main body.

It should be further noted that the outward tilted body tilts outward at a certain angle, but does not affect the assembly of the nut. After the nut is assembled into the stud, the outer warping body is still in a slightly warped state; namely, the outward warping body continuously applies force to the nut along the direction that the nut is installed into the stud.

When the nut needs to be removed, the fastening device can be loosened by only rotating the nut or the bolt through a tool such as a wrench, and the nut continues to rotate until the nut is removed.

In the second embodiment, an example of the internal thread structure of the nut is such that the internal diameter of one end of the internal thread structure is larger than that of the other end of the internal thread structure, and the internal diameter of the internal thread structure gradually decreases from the end having a large diameter to a small transition. The transition process can be linear or arc. The design that the internal thread structure is from big to small can make the nut assemble in the double-screw bolt better.

In a second embodiment, another example of the internal thread structure of the nut is that the internal diameters of both ends of the internal thread structure are larger than the internal diameter of the middle portion of the internal thread structure, and the internal diameter of the internal thread structure gradually decreases from one end portion with a large diameter to transition to the middle portion with a small diameter, and then gradually increases from the middle portion with a small diameter to transition to the other end portion with a large diameter. The transition process can be linear or arc. The diameter of the internal thread structure is designed from big to small and then big, so that the front surface and the back surface of the nut can be conveniently assembled into the stud, and the working efficiency is improved.

In a second embodiment, the tightening part further comprises a mounting guide head. The diameter of installation guide head is less than the diameter of external screw thread structure, and it can guide the better bolt hole that passes of double-screw bolt, improves work efficiency.

In a second embodiment, the tightening part further comprises: a torsion limiting column. After the outer warping body is separated from the deformation pretension seam in the tightening part, a torsion limiting column is arranged at the axis and is not provided with threads. The torsion limiting column does not deflect towards any direction. The outward warping body is stressed to gather inwards and then is combined with the torsion limiting column to form a normal stud shape. The torsion limiting column is a polygonal prism, and in the process of assembling the stud and the nut, the torsion limiting column is abutted against the outward warping body, and the prism surface of the torsion limiting column provides circumferential supporting force for the outward warping body to prevent the outward warping body from deforming and damaging in the assembling process.

In a second embodiment, the torsion restraint posts are preferably regular polygonal prisms.

It should be noted that the torque limiting column is similar to the end of the inner-angle screwdriver, for example, the pentagonal screwdriver is inserted into the inner-pentagonal bolt, and the protrusion of the pentagonal screwdriver drives the inner-pentagonal bolt to rotate circumferentially. And the utility model discloses in, the effect of the spacing post of torsion is for keeping the relative double-screw bolt motion of the body of warping outward on the circumferencial direction.

In a second embodiment, the axis of the outward warping body refers to the geometric axis of the outward warping body, the geometric axis of the outward warping body and the central axis of the tightening part are in the same plane, and the outward warping body warps around the tightening part in the plane.

In a second embodiment, the outward warping body is spirally arranged around the central axis of the tightening part, and the spiral direction of the outward warping body is opposite to the spiral direction of the external thread structure. In this embodiment, if the screw directions of the stud and the nut are both right-handed screws, the screw direction of the outward-warping body is left-handed screws. Seen in the direction in which the nut is fitted into the stud. When the nut rotates clockwise relative to the stud, the nut is in the motion process of screwing into the stud. The nut will now give the outward warped body a circumferential force in the clockwise direction. The circumferential force is applied to the outward warping body in the left spiral direction, so that the outward warping body is close to the central axis of the tightening part. The circumferential force and the radial force given to the outward warping body by the nut enable the outward warping body to be close inwards. Thereby make the nut change the installation, improve work efficiency.

Conversely, when the nut rotates counterclockwise relative to the stud, the nut is in the process of screwing out the stud. The nut will now give the outward warped body a circumferential force in the counter clockwise direction. The circumferential force is applied to the outward warping body in the left spiral direction, so that the outward warping body is expanded back to the central axis of the tightening part. So that the supporting force between the outward warping body and the stud is increased, and the friction force between the outward warping body and the stud is improved. Thereby making the nut not easy to loosen and playing the role of preventing loosening.

In a second embodiment, the end of the external thread structure is provided with a chamfer, i.e. the outer end of the outward warping body is provided with a chamfer. The end of the installation guide head is provided with a chamfer. The nut positioning device is beneficial to positioning with the nut during assembly, and the working efficiency is improved.

In the second embodiment, chamfers are arranged at two ends of the nut through hole, so that the positioning of the nut and the stud during assembly is facilitated, and the working efficiency is improved.

In a second embodiment, the sealing dust-proof cover is arranged at one end of the nut and plays a role of dust prevention. In addition, a locking barb is arranged in the sealed dustproof cover. The locking barb is a conical structure, and one end of the conical top of the locking barb of the conical structure corresponds to the deformation pretension seam. The locking barb of the conical structure is of a conical structure, the conical bottom of the conical structure is connected with the sealing dustproof cover, and the conical top of the conical structure is arranged corresponding to the deformation tension seam, so that when the self-tightening bolt and nut fastening device of the utility model is used or the self-tightening stud and nut fastening device of the utility model is used, the nut is screwed up, and the deformation tension seam is compressed, so that the bolt or stud generates tension in the state, and the nut on the bolt or stud is prevented from loosening; in addition, the conical top part of the locking barb in the sealed dust cover is inserted into the deformation tension seam, the locking barb forces the outward warping body to separate, the tension of the outward warping body is further increased, and the generated tension and the force of the nut fastening bolt or the stud form a pile of acting force with opposite effects, so that the nut is further prevented from loosening.

In a second embodiment, the width of the deformed pre-tension slit varies with the degree of warpage of the warp body. And the end close to the bolt head is tightly attached with the outward warping body, so that the width of the deformed pre-tension seam is the minimum. At one end far away from the bolt head, the outward warping bodies mutually warp to the position farthest away from the axis in the tightening part, and the width of the deformation pre-tension seam is the largest. In the process of using the bolt, the outward warping body is extruded by external force to approach the axial line in the tightening part, and the width of the deformation pretension seam is reduced.

In a second embodiment, the tightening part is divided into a plurality of outward warping bodies by the deformation pretension seam, and the outward warping bodies are similar to the bolt in the prior art in appearance after being gathered under the action of external force.

In the second embodiment, the stud is made of elastic steel materials, and the stud has certain elasticity, so that the service life of the bolt is prolonged.

In the utility model, one end of the bolt head far away from the bolt main body is provided with a locking groove, or two ends of the stud main body are provided with locking grooves; the locking groove is arranged at the position of the deformation pretension seam. When the nut is screwed down, the locking barbs are matched with the locking grooves, the locking barbs extend into the locking grooves, the locking barbs generate a supporting acting force on the bolt or the stud, the deformation pretension seam of the bolt or the stud is forced to have an opening trend, and the nut is further prevented from loosening. And, the closer the nut is twisted, the tighter the locking barb is matched with the locking groove, the larger the supporting force of the locking barb on the bolt or the stud is, and the better the anti-loosening effect of the nut is.

In the present invention, the length of the self-tightening bolt is 0.1mm to 10m, preferably 1mm to 5m, more preferably 2mm to 2m, still more preferably 3mm to 1m, and still more preferably 5mm to 0.5 m.

In the present invention, the diameter of the self-tightening bolt is 0.1mm to 2m, preferably 1mm to 1m, more preferably 1.5mm to 0.8m, still more preferably 2mm to 0.5m, and still more preferably 2.5mm to 0.4 m.

In the present invention, the pitch of the thread structure of the self-tightening bolt is 0.01mm to 1m, preferably 0.02mm to 0.8m, more preferably 0.03mm to 0.6m, and still more preferably 0.04mm to 0.5 m.

In the present invention, the length of the self-tightening stud is 0.1mm to 20m, preferably 1mm to 15m, more preferably 2mm to 10m, still more preferably 3mm to 5m, and still more preferably 5mm to 2 m.

In the present invention, the diameter of the self-tightening stud is 0.1mm to 2m, preferably 1mm to 1m, more preferably 1.5mm to 0.8m, still more preferably 2mm to 0.5m, and still more preferably 2.5mm to 0.4 m.

In the present invention, the pitch of the thread structure of the self-tightening stud is 0.01mm to 1m, preferably 0.02mm to 0.8m, more preferably 0.03mm to 0.6m, and still more preferably 0.04mm to 0.5 m.

In the utility model, the difference between the maximum inner diameter and the minimum inner diameter (i.e. D5-D6) of the nut is 0.00001mm-50cm, preferably 0.0001mm-40cm, more preferably 0.001mm-30cm, still more preferably 0.01mm-20cm, and still more preferably 0.02mm-10 cm.

Compared with the prior art, the utility model discloses following beneficial effect has:

1. the bolt and nut fastening device or the stud and nut fastening device designed by the utility model can achieve the self-tightening purpose without the help of other parts;

2. the utility model relates to a bolt, nut fastening device or double-screw bolt, nut fastening device, based on the design scheme of the outer upwarp body of the bolt or double-screw bolt, when the nut is vibrated in the use process, the nut is more and more fastened by vibration, and the effects of anti-backing and anti-loosening are realized;

4. the installation guide head of the bolt or the stud is beneficial to the quick assembly of the bolt or the stud and the nut;

5. the nut designed by the utility model has the internal thread structure which is beneficial to matching with the bolt or the stud designed by the utility model, thereby achieving the purpose of improving the working efficiency;

6. the torsion limiting column designed by the utility model can effectively improve the rigidity of circumferential rotation of the outward warping body and prolong the service life of the bolt or the stud;

7. the utility model discloses a have spiral helicine outer body of warping up can help improving the anticreep effect of nut.

8. The utility model relates to a be equipped with the locking barb in the sealed shield of nut, the cone top part of locking barb is inserted deformation tension seam, and the locking barb forces the outer perk body separately, further increases the tension of the outer perk body, and the tension of production forms a pile of effort of acting on the contrary with the power of nut fastening bolt or double-screw bolt to it is not hard up to further prevent the nut.

Drawings

Fig. 1 is the structure schematic diagram of the nut with the sealing dust-proof cover and the self-tightening bolt of the utility model.

FIG. 2 is a schematic view of the assembly of the bolt and the nut of the present invention;

FIG. 3 is a schematic structural view of the self-tightening bolt of the present invention in an unused state;

FIG. 4 is a schematic view of the structure of the self-tightening bolt of the present invention in a use state;

FIG. 5 is a schematic view of the single-sided screw-in nut of the present invention;

FIG. 6 is a schematic view of the double-sided screw-in nut of the present invention;

fig. 7 is a schematic view of the self-tightening stud of the present invention;

fig. 8 is a structural sectional view of the tightening part with the torque limiting post according to the present invention in an unused state;

fig. 9 is a sectional view of the structure of the tightening part with the torque force limiting post according to the present invention;

FIG. 10 is a side view of the tightening part with a torque limiting post according to the present invention in an unused state;

fig. 11 is a side view of the structure of the tightening part with the torque limiting post according to the present invention;

fig. 12 is a schematic structural view of the nut with the sealing dust cap of the present invention.

Reference numerals: 1: a bolt; 101: a bolt body; 102: a bolt head; 103: locking the groove; 2: a nut; 201: a nut body; 202: a nut through hole; 203: an internal thread structure; 204: sealing the dustproof cover; 3: a stud; 301: a stud body; 4: a tightening part; 401: an outward warping body; 402: deforming the pre-tension seam; 403: installing a guide head; 404: a torsion limiting column; 5: an external thread structure; 6: locking barbs.

Detailed Description

a self-tightening bolt and nut tightening device, comprising: a bolt 1 and a nut 2; the nut 2 is assembled with the bolt 1 through a thread structure; the bolt 1 includes: a bolt body 101, a bolt head 102, a tightening part 4, and an external thread structure 5; the bolt head 102 is provided at one end of the bolt body 101; the tightening part 4 is provided at the other end of the bolt main body 101; the external thread structure 5 is arranged on the outer surface of the tightening part 4; the nut 2 includes: a nut main body 201, a nut through hole 202 and an internal thread structure 203; the nut through hole 202 is arranged on the nut main body 201; the internal thread structure 203 is arranged on the inner wall of the nut through hole 202; the tightening portion 4 includes: an outward warping body 401 and a deformation pretension seam 402; the tightening part 4 is divided into a plurality of outward warping bodies 401 by the deformation pre-tension seams 402; the periphery of the outward warping body 401 is provided with an external thread structure 5; the parts of the outward warping body 401 close to one end of the bolt head 102 are tightly attached to each other; the parts of the raised bodies 401 far away from one end of the bolt head 102 are separated from each other; the diameter of the external thread structure 5 on the raised body 401 close to one end of the bolt head 102 is D1, and the diameter of the external thread structure 5 on the raised body 401 far away from one end of the bolt head 102 is D2; d2> D1; the diameter of the external thread structure 5 on the outward warping body 401 gradually increases from D1 at one end to D2 at the other end.

Preferably, the inner diameter of one end of the internal thread structure 203 is D5, and the inner diameter of the other end of the internal thread structure 203 is D6; and D5> D6; the internal diameter of the internal thread structure 203 gradually decreases from D5 at one end to D6 at the other end.

Preferably, the inner diameter of both ends of the internal thread structure 203 is D5, and the inner diameter of the middle section of the internal thread structure 203 is D6; and D5> D6; the internal diameter of the internal thread structure 203 gradually becomes smaller and larger from D5 at one end to D6 at the middle part and then gradually becomes larger and larger from D6 at the middle part to D5 at the other end.

Preferably, the tightening part 4 further includes: an installation guide head 403, the installation guide head 403 being provided on an end surface of the tightening part 4; the mounting guide head 403 is coaxial with the tightening part 4; the mounting guide head 403 is separated from the attached warp body 401 by a deformation pretension slit 402; the installation guide head 403 has a split diameter D7; d7 is not less than D1.

Preferably, the end of the bolt head 102 away from the bolt body 101 is provided with a locking groove 103. The locking groove 103 is provided at the location of the deformed pre-tension slit 402.

Preferably, the tightening part 4 further includes: a torque limiting post 404; the torsion limiting column 404 is arranged at the central position of the tightening part 4, and the deformation pretension seam 402 is arranged between the outward warping body 401 and the torsion limiting column 404; the outward warping body 401 is tightly attached to the torsion limiting column 404 after being gathered.

Preferably, the torsion limiting column 404 is a polygonal prism; more preferably a regular polygonal prism.

Preferably, the axis of the outward warping body 401 and the central axis of the tightening part 4 are in the same plane.

Preferably, the outward turning body 401 is spirally arranged around the central axis of the tightening part 4, and the spiral direction of the outward turning body 401 is opposite to the spiral direction of the structure of the external thread structure 5.

Preferably, the end of the external thread structure 5 and/or the installation guide head 403 is/are provided with a chamfer; preferably, both ends of the nut through hole 202 are chamfered.

Preferably, the nut 2 further comprises a sealing dust cap 204, the sealing dust cap 204 is connected with one end of the nut body 201, and the nut body 201 is of a concave structure or a "U" shaped structure. The sealed dust cover 204 is internally provided with a locking barb 6.

Preferably, the deformed pre-tension slit 402 is a straight line or a curved line, and the width of the deformed pre-tension slit 402 is 0.01 to 50mm, preferably 0.02 to 30mm, and more preferably 0.03 to 20 mm; the width of the deformed pre-tension slit 402 gradually widens from the end near the bolt head 102 to the end away from the bolt head 102.

Preferably, the tightening part 4 is divided into 2 to 10 outward tilted bodies 401, preferably 3 to 8 outward tilted bodies 401, and more preferably 4 to 6 outward tilted bodies 401 by the deformation pretension seam 402.

Preferably, the tightening part 4 is made of an elastic steel material; preferably, the self-tightening bolt and the nut fastening device are both made of elastic steel materials.

a self-tightening stud and nut fastening device, the device comprising: a stud 3 and a nut 2; the nut 2 is assembled with the stud 3 through a threaded structure; the stud 3 includes: a stud body 301, a tightening part 4, and an external thread structure 5; the two ends of the stud main body 301 are respectively and independently provided with the tightening parts 4; the external thread structure 5 is arranged on the outer surface of the tightening part 4; the nut 2 includes: a nut main body 201, a nut through hole 202 and an internal thread structure 203; the nut through hole 202 is arranged on the nut main body 201; the internal thread structure 203 is arranged on the inner wall of the nut through hole 202; the tightening portion 4 includes: an outward warping body 401 and a deformation pretension seam 402; the tightening part 4 is divided into a plurality of outward warping bodies 401 by the deformation pre-tension seams 402; the periphery of the outward warping body 401 is provided with an external thread structure 5; one ends of the outward warping bodies 401 close to the middle of the stud main body 301 are tightly attached to each other; one ends of the outward warping bodies 401 far away from the middle of the stud main body 301 are separated from each other; the diameter of the external thread structure 5 on the outward warping body 401, which is close to the middle end of the stud main body 301, is D3, and the diameter of the external thread structure 5 on the outward warping body 401, which is far away from the middle end of the stud main body 301, is D4; d4> D3; the diameter of the external thread structure 5 on the outward warping body 401 gradually increases from D3 at one end to D4 at the other end.

Preferably, the tightening part 4 further includes: an installation guide head 403, the installation guide head 403 being provided on an end surface of the tightening part 4; the mounting guide head 403 is coaxial with the tightening part 4; the mounting guide head 403 is separated from the attached warp body 401 by a deformation pretension slit 402; the installation guide head 403 has a split diameter D7; d7 is not less than D3.

Preferably, the stud body 301 is provided with locking grooves 103 at both ends. The locking groove 103 is provided at the location of the deformed pre-tension slit 402.

Preferably, the deformed pre-tension slit 402 is a straight line or a curved line, and the width of the deformed pre-tension slit 402 is 0.01 to 50mm, preferably 0.02 to 30mm, and more preferably 0.03 to 20 mm; the width of the deformed pre-tension slit 402 gradually becomes wider from one end close to the stud body 301 to one end far away from the stud body 301.

Example 1

A self-tightening bolt and nut tightening device, comprising: a bolt 1 and a nut 2; the nut 2 is assembled with the bolt 1 through a thread structure; the bolt 1 includes: a bolt body 101, a bolt head 102, a tightening part 4, and an external thread structure 5; the bolt head 102 is provided at one end of the bolt body 101; the tightening part 4 is provided at the other end of the bolt main body 101; the external thread structure 5 is arranged on the outer surface of the tightening part 4; the nut 2 includes: a nut main body 201, a nut through hole 202 and an internal thread structure 203; the nut through hole 202 is arranged on the nut main body 201; the internal thread structure 203 is arranged on the inner wall of the nut through hole 202; the tightening portion 4 includes: an outward warping body 401 and a deformation pretension seam 402; the tightening part 4 is divided into a plurality of outward warping bodies 401 by the deformation pre-tension seams 402; the periphery of the outward warping body 401 is provided with an external thread structure 5; the parts of the outward warping body 401 close to one end of the bolt head 102 are tightly attached to each other; the parts of the raised bodies 401 far away from one end of the bolt head 102 are separated from each other; the diameter of the external thread structure 5 on the raised body 401 close to one end of the bolt head 102 is D1, and the diameter of the external thread structure 5 on the raised body 401 far away from one end of the bolt head 102 is D2; d2> D1; the diameter of the external thread structure 5 on the outward warping body 401 gradually increases from D1 at one end to D2 at the other end. The nut 2 further comprises a sealing dustproof cover 204, the sealing dustproof cover 204 is connected with one end of the nut main body 201, and the nut main body 201 is of a concave structure or a U-shaped structure. The sealed dust cover 204 is internally provided with a locking barb 6.

Example 2

Example 1 was repeated except that the inner diameter of one end of the internal thread structure 203 was D5 and the inner diameter of the other end of the internal thread structure 203 was D6; and D5> D6; the internal diameter of the internal thread structure 203 gradually decreases from D5 at one end to D6 at the other end.

Example 3

Example 2 was repeated except that the inner diameter of both ends of the female screw structure 203 was D5 and the inner diameter of the middle section of the female screw structure 203 was D6; and D5> D6; the internal diameter of the internal thread structure 203 gradually becomes smaller and larger from D5 at one end to D6 at the middle part and then gradually becomes larger and larger from D6 at the middle part to D5 at the other end.

Example 4

Example 3 was repeated except that the tightening part 4 further included: an installation guide head 403, the installation guide head 403 being provided on an end surface of the tightening part 4; the mounting guide head 403 is coaxial with the tightening part 4; the mounting guide head 403 is separated from the attached warp body 401 by a deformation pretension slit 402; the installation guide head 403 has a split diameter D7; d7 is not less than D1.

Example 5

Example 4 was repeated except that the tightening part 4 further included: a torque limiting post 404; the torsion limiting column 404 is arranged at the central position of the tightening part 4, and the deformation pretension seam 402 is arranged between the outward warping body 401 and the torsion limiting column 404; the outward warping body 401 is tightly attached to the torsion limiting column 404 after being gathered. The end of the bolt head 102 remote from the bolt body 101 is provided with a locking groove 103. The locking groove 103 is provided at the location of the deformed pre-tension slit 402.

Example 6

Example 5 is repeated except that the torque limiting post 404 is a polygonal prism.

Example 7

Example 6 is repeated except that the torque limiting post 404 is a regular polygonal prism.

Example 8

Example 7 is repeated except that the axis of the outward warping body 401 is in the same plane as the central axis of the tightening part 4.

Example 9

Example 7 is repeated, except that the outward warping body 401 is spirally arranged around the central axis of the tightening part 4, and the spiral direction of the outward warping body 401 is opposite to the spiral direction of the structure of the external thread structure 5.

Example 10

Example 9 was repeated except that the end of the male thread structure 5 was provided with a chamfer. The end of the mounting guide head 403 is chamfered. Chamfers are arranged at two ends of the nut through hole 202.

Example 11

Example 10 is repeated except that the locking barb 6 is of a conical structure, and one end of the conical top of the locking barb 6 of the conical structure is arranged corresponding to the deformation pretension seam 402.

Example 12

Embodiment 10 is repeated, except that the nut 2 further comprises a sealing dust-proof cover 204, the sealing dust-proof cover 204 is connected with one end of the nut main body 201, and the nut main body 201 is of a U-shaped structure.

Example 13

Example 12 was repeated except that the deformed pre-tension slit 402 was a straight line and the minimum width of the deformed pre-tension slit 402 was 0.01 mm; the width of the deformed pre-tension slit 402 gradually widens from the end near the bolt head 102 to the end away from the bolt head 102.

Example 14

Example 12 was repeated except that the deformed pre-tension slit 402 was curved and the minimum width of the deformed pre-tension slit 402 was 0.01 mm; the width of the deformed pre-tension slit 402 gradually widens from the end near the bolt head 102 to the end away from the bolt head 102.

Example 15

Example 14 was repeated except that the tightening part 4 was divided into 5 outward turned bodies 401 by the deformed pre-tension slits 402.

Example 16

Example 15 was repeated except that the tightening part 4 was made of an elastic steel material.

Example 17

Example 16 was repeated except that the self-tightening bolts and the nut tightening devices were made of an elastic steel material.

Example 18

A self-tightening stud and nut fastening device, the device comprising: a stud 3 and a nut 2; the nut 2 is assembled with the stud 3 through a threaded structure; the stud 3 includes: a stud body 301, a tightening part 4, and an external thread structure 5; the two ends of the stud main body 301 are respectively and independently provided with the tightening parts 4; the external thread structure 5 is arranged on the outer surface of the tightening part 4; the nut 2 includes: a nut main body 201, a nut through hole 202 and an internal thread structure 203; the nut through hole 202 is arranged on the nut main body 201; the internal thread structure 203 is arranged on the inner wall of the nut through hole 202; the tightening portion 4 includes: an outward warping body 401 and a deformation pretension seam 402; the tightening part 4 is divided into a plurality of outward warping bodies 401 by the deformation pre-tension seams 402; the periphery of the outward warping body 401 is provided with an external thread structure 5; one ends of the outward warping bodies 401 close to the middle of the stud main body 301 are tightly attached to each other; one ends of the outward warping bodies 401 far away from the middle of the stud main body 301 are separated from each other; the diameter of the external thread structure 5 on the outward warping body 401, which is close to the middle end of the stud main body 301, is D3, and the diameter of the external thread structure 5 on the outward warping body 401, which is far away from the middle end of the stud main body 301, is D4; d4> D3; the diameter of the external thread structure 5 on the outward warping body 401 gradually increases from D3 at one end to D4 at the other end. The nut 2 further comprises a sealing dustproof cover 204, the sealing dustproof cover 204 is connected with one end of the nut main body 201, and the nut main body 201 is of a concave structure or a U-shaped structure. The sealed dust cover 204 is internally provided with a locking barb 6.

Example 19

Example 18 was repeated except that the inner diameter of one end of the internal thread structure 203 was D5 and the inner diameter of the other end of the internal thread structure 203 was D6; and D5> D6; the internal diameter of the internal thread structure 203 gradually decreases from D5 at one end to D6 at the other end.

Example 20

Example 19 was repeated except that the inner diameter of both ends of the female screw structure 203 was D5 and the inner diameter of the middle section of the female screw structure 203 was D6; and D5> D6; the internal diameter of the internal thread structure 203 gradually becomes smaller and larger from D5 at one end to D6 at the middle part and then gradually becomes larger and larger from D6 at the middle part to D5 at the other end.

Example 21

Example 20 was repeated except that the tightening part 4 further included: an installation guide head 403, the installation guide head 403 being provided on an end surface of the tightening part 4; the mounting guide head 403 is coaxial with the tightening part 4; the mounting guide head 403 is separated from the attached warp body 401 by a deformation pretension slit 402; the installation guide head 403 has a split diameter D7; d7 is not less than D3. The stud body 301 is provided with locking grooves 103 at both ends. The locking groove 103 is provided at the location of the deformed pre-tension slit 402.

Example 22

Example 21 was repeated except that the tightening part 4 further included: a torque limiting post 404; the torsion limiting column 404 is arranged at the central position of the tightening part 4, and the deformation pretension seam 402 is arranged between the outward warping body 401 and the torsion limiting column 404; the outward warping body 401 is tightly attached to the torsion limiting column 404 after being gathered.

Example 23

Example 22 is repeated except that the torque limiting post 404 is a polygonal prism.

Example 24

Example 23 is repeated except that the torque limiting post 404 is a regular polygonal prism.

Example 25

Example 24 is repeated except that the axis of the outward warping body 401 is in the same plane as the central axis of the tightening part 4.

Example 26

Example 24 is repeated, except that the outward warping body 401 is spirally arranged around the central axis of the tightening part 4, and the spiral direction of the outward warping body 401 is opposite to the spiral direction of the structure of the external thread structure 5.

Example 27

Example 26 is repeated except that the end of the male thread form 5 is chamfered. The end of the mounting guide head 403 is chamfered. Chamfers are arranged at two ends of the nut through hole 202.

Example 28

Example 27 was repeated except that the locking barb 6 was a cone-shaped structure, and the cone top end of the locking barb 6 of the cone-shaped structure was disposed corresponding to the deformation pretension slit 402.

Example 29

Embodiment 27 is repeated except that the nut 2 further comprises a sealing dust cap 204, the sealing dust cap 204 is connected with one end of the nut body 201, and the nut body 201 is in a U-shaped structure.

Example 30

Example 29 was repeated except that the deformed pre-tension slit 402 was a straight line and the minimum width of the deformed pre-tension slit 402 was 0.01 mm; the width of the deformed pre-tension slit 402 gradually becomes wider from one end close to the stud body 301 to one end far away from the stud body 301.

Example 31

Example 29 was repeated except that the deformed pre-tension slit 402 was curved and the minimum width of the deformed pre-tension slit 402 was 0.01 mm; the width of the deformed pre-tension slit 402 gradually becomes wider from one end close to the stud body 301 to one end far away from the stud body 301.

Example 32

Example 31 was repeated except that the tightening part 4 was divided into 5 outward warped bodies 401 by the deformed pre-tension slits 402.

Example 33

Example 32 was repeated except that the tightening part 4 was made of an elastic steel material. The self-tightening bolt and the nut fastening device are both made of elastic steel materials.

Comparative example 1

A self-tightening bolt and nut fastening assembly (application No.: 201711041696.2). The utility model discloses a self-tightening bolt and nut fastening assembly belongs to machinery, including fastening nut body, self-tightening bolt and packing ring, self-tightening bolt includes the bolt handle and shank of bolt, the heliciform curved surface by the spiral is a little on the central axis with the spiral is a little line on the lateral surface same height around the spiral to the central axis constant speed rotation and along the spiral form central axis constant speed removal, and rotation angle is greater than 360, is less than 540. The utility model has the advantages that: the rotation angle of the spiral curved surface is set to be larger than 360 degrees, so that a connecting line between one point on the central axis of the spiral handle and one point on the same height of the outer side surface of the spiral handle rotates for more than one circle, an embedded block is formed on the contact surface of the spiral handle and the gasket and is mutually nested with the gasket, even if part of threads on the bolt are damaged due to vibration, the gasket cannot move relative to the bolt in the axial direction of the bolt on the premise of not being damaged, and the self-tightening effect is really realized. The self-tightening bolt and nut adopt the traditional pitch phase difference principle, thereby achieving the self-tightening purpose.

The self-tightening bolts or studs of the examples and the self-tightening bolt and nut fastening assemblies of the comparative example 1 were used for vibration resistance tests, and the test results were as follows:

test object	Frequency of vibration	Amplitude of vibration	Loosening condition
				Example 1	15HZ	2mm	Continuously vibrating for 360 days without loosening
Example 2	15HZ	2mm	Continuously vibrating for 360 days without loosening
				Example 3	15HZ	2mm	Continuously vibrating for 360 days without loosening
Example 9	30HZ	2mm	Continuously vibrating for 360 days without loosening
				Example 18	15HZ	2mm	Continuously vibrating for 360 days without loosening
Example 19	15HZ	2mm	Continuously vibrating for 360 days without loosening
				Example 20	15HZ	2mm	Continuously vibrating for 360 days without loosening
Example 26	30HZ	2mm	Continuously vibrating for 360 days without loosening
				Comparative example 1	15HZ	2mm	Loosening within 24 hours

In addition, adopt the utility model discloses self-tightening bolt or double-screw bolt of embodiment carry out the anti vibration test, the utility model discloses self-tightening bolt or double-screw bolt of embodiment 1-33 preparation are used with the cooperation of conventional nut, and it is all not hard up to exceed 500 hundred million times through the vibration number of times, realization self-tightening that can be fine, locking purpose and effect of moving. The utility model discloses the self-tightening bolt or the double-screw bolt of embodiment 1-33 preparation and the utility model discloses a nut cooperation is used, and it is all not hard up to exceed 1000 hundred million times through the vibration number of times, realization self-tightening that can be fine, locking purpose and effect of moving.

Claims

1. A self-tightening bolt and nut tightening device, comprising: a bolt (1) and a nut (2); the nut (2) is assembled with the bolt (1) through a thread structure; the bolt (1) comprises: a bolt main body (101), a bolt head (102), a tightening part (4), and an external thread structure (5); the bolt head (102) is arranged at one end of the bolt main body (101); the tightening part (4) is provided at the other end of the bolt main body (101); the external thread structure (5) is arranged on the outer surface of the tightening part (4); the nut (2) comprises: the nut comprises a nut body (201), a nut through hole (202) and an internal thread structure (203); the nut through hole (202) is arranged on the nut main body (201); the internal thread structure (203) is arranged on the inner wall of the nut through hole (202);

the method is characterized in that: the tightening part (4) includes: an outward warping body (401) and a deformation pretension seam (402); the tightening part (4) is divided into a plurality of outward warping bodies (401) by the deformation pretension seam (402); the periphery of the outward warping body (401) is provided with an external thread structure (5); the parts of the outward warping body (401) close to one end of the bolt head (102) are tightly attached to each other; the parts of the warping bodies (401) far away from one end of the bolt head (102) are separated from each other; the diameter of the external thread structure (5) at one end, close to the bolt head (102), of the outward warping body (401) is D1, and the diameter of the external thread structure (5) at one end, far away from the bolt head (102), of the outward warping body (401) is D2; d2> D1; the diameter of the external thread structure (5) on the outward warping body (401) is gradually increased from D1 at one end to D2 at the other end; the nut (2) further comprises a sealed dustproof cover (204), the sealed dustproof cover (204) is connected with one end of the nut body (201), the nut (2) is of a concave structure or a U-shaped structure, and locking barbs (6) are arranged in the sealed dustproof cover (204).

2. The self-tightening bolt-nut tightening apparatus according to claim 1, characterized in that: the inner diameter of one end of the internal thread structure (203) is D5, and the inner diameter of the other end of the internal thread structure (203) is D6; and D5> D6; the inner diameter of the internal thread structure (203) is gradually reduced from D5 at one end to D6 at the other end.

3. The self-tightening bolt-nut tightening apparatus according to claim 1, characterized in that: the inner diameter of two ends of the internal thread structure (203) is D5, and the inner diameter of the middle section of the internal thread structure (203) is D6; and D5> D6; the internal diameter of the internal thread structure (203) gradually becomes smaller and larger from D5 at one end to D6 at the middle part and then from D6 at the middle part to D5 at the other end.

4. A self-tightening bolt-and-nut tightening device according to any one of claims 1 to 3, wherein: the tightening part (4) further includes: an installation guide head (403), wherein the installation guide head (403) is arranged on the end surface of the tightening part (4); the installation guide head (403) is coaxial with the tightening part (4); the installation guide head (403) and the connected outward warping body (401) are separated by a deformation pretension seam (402); the diameter of the installation guide head (403) after separation is D7; d1 is not less than D7 or D3 is not less than D7; and/or

One end of the bolt head (102) far away from the bolt body (101) is provided with a locking groove (103), and the locking groove (103) is arranged at the position of the deformation pretension slot (402).

5. A self-tightening bolt-and-nut tightening device according to any one of claims 1 to 3, wherein: the tightening part (4) further includes: a torsion limiting post (404); the torsion limiting column (404) is arranged at the central position of the tightening part (4), and the deformation pretension seam (402) is arranged between the outward warping body (401) and the torsion limiting column (404); the outward warping body (401) is tightly attached to the torsion limiting column (404) after being gathered.

6. The self-tightening bolt-nut tightening apparatus according to claim 4, wherein: the tightening part (4) further includes: a torsion limiting post (404); the torsion limiting column (404) is arranged at the central position of the tightening part (4), and the deformation pretension seam (402) is arranged between the outward warping body (401) and the torsion limiting column (404); the outward warping body (401) is tightly attached to the torsion limiting column (404) after being gathered.

7. The self-tightening bolt-nut tightening apparatus according to claim 5, wherein: the torsion limiting column (404) is a polygonal prism.

8. The self-tightening bolt-nut tightening apparatus according to claim 7, wherein: the torsion limiting column (404) is a regular polygon prism.

9. The self-tightening bolt-and-nut tightening device according to any one of claims 1 to 3, 6 and 8, wherein: the axial line of the outward warping body (401) and the central axis of the tightening part (4) are in the same plane; or

The outer warping body (401) is spirally arranged around the central axis of the screwing part (4), and the spiral direction of the outer warping body (401) is opposite to the spiral direction of the external thread structure (5).

10. The self-tightening bolt-nut tightening apparatus according to claim 4, wherein: the axial line of the outward warping body (401) and the central axis of the tightening part (4) are in the same plane; or

11. The self-tightening bolt-nut tightening apparatus according to claim 4, wherein: the end part of the external thread structure (5) and/or the installation guide head (403) is/are provided with a chamfer; chamfers are arranged at two ends of the nut through hole (202); and/or

The locking barb (6) is of a conical structure, and one end of the conical top of the locking barb (6) of the conical structure is arranged corresponding to the deformation pretension seam (402).

12. The self-tightening bolt-nut tightening apparatus according to claim 6 or 10, characterized in that: the end part of the external thread structure (5) and/or the installation guide head (403) is/are provided with a chamfer; chamfers are arranged at two ends of the nut through hole (202); and/or

13. Self-tightening bolt and nut tightening device according to any one of claims 1 to 3, 6, 8, 10 and 11, characterized in that: the deformation pre-tension seam (402) is a straight line or a curve, and the width of the deformation pre-tension seam (402) is 0.01-50 mm; the width of the deformed pre-tension slit (402) gradually widens from the end close to the bolt head (102) to the end far away from the bolt head (102).

14. The self-tightening bolt-nut tightening apparatus according to claim 13, wherein: the width of the deformation pretension seam (402) is 0.02-30 mm.

15. The self-tightening bolt-nut tightening apparatus according to claim 14, wherein: the width of the deformation pretension seam (402) is 0.03-20 mm.

16. The self-tightening bolt-nut tightening apparatus according to claim 4, wherein: the deformation pre-tension seam (402) is a straight line or a curve, and the width of the deformation pre-tension seam (402) is 0.01-50 mm; the width of the deformed pre-tension slit (402) gradually widens from the end close to the bolt head (102) to the end far away from the bolt head (102).

17. The self-tightening bolt-nut tightening apparatus according to claim 16, wherein: the width of the deformation pretension seam (402) is 0.02-30 mm.

18. The self-tightening bolt-nut tightening apparatus according to claim 17, wherein: the width of the deformation pretension seam (402) is 0.03-20 mm.

19. A self-tightening bolt and nut tightening device according to any one of claims 1 to 3, 6, 8, 10, 11, and 14 to 18, wherein: the tightening part (4) is divided into 2-10 outward warping bodies (401) by the deformation pretension seam (402).

20. The self-tightening bolt-nut tightening apparatus according to claim 19, wherein: the screwing part (4) is divided into 3-8 outward warping bodies (401) by the deformation pretension seam (402).

21. The self-tightening bolt-nut tightening apparatus according to claim 20, wherein: the tightening part (4) is divided into 4-6 outward warping bodies (401) by the deformation pretension seam (402).

22. A self-tightening bolt-and-nut tightening device according to any one of claims 1 to 3, 6, 8, 10, 11, 14 to 18, 20 and 21, wherein: the tightening part (4) is made of elastic steel material; the self-tightening bolt and the nut fastening device are both made of elastic steel materials.

23. The self-tightening bolt-nut tightening apparatus according to claim 4, wherein: the tightening part (4) is made of elastic steel material; the self-tightening bolt and the nut fastening device are both made of elastic steel materials.

24. A self-tightening stud and nut fastening device, the device comprising: a stud (3) and a nut (2); the nut (2) is assembled with the stud (3) through a thread structure; the stud (3) comprises: a stud body (301), a tightening part (4), and an external thread structure (5); the two ends of the stud main body (301) are respectively and independently provided with the tightening parts (4); the external thread structure (5) is arranged on the outer surface of the tightening part (4); the nut (2) comprises: the nut comprises a nut body (201), a nut through hole (202) and an internal thread structure (203); the nut through hole (202) is arranged on the nut main body (201); the internal thread structure (203) is arranged on the inner wall of the nut through hole (202);

the method is characterized in that: the tightening part (4) includes: an outward warping body (401) and a deformation pretension seam (402); the tightening part (4) is divided into a plurality of outward warping bodies (401) by the deformation pretension seam (402); the periphery of the outward warping body (401) is provided with an external thread structure (5); one ends of the outward warping bodies (401) close to the middle of the stud main body (301) are tightly attached to each other; one ends, far away from the middle of the stud main body (301), of the outward warping bodies (401) are separated from each other; the diameter of the external thread structure (5) on the outward warping body (401) close to one end of the middle of the stud main body (301) is D3, and the diameter of the external thread structure (5) on the outward warping body (401) far away from one end of the middle of the stud main body (301) is D4; d4> D3; the diameter of the external thread structure (5) on the outward warping body (401) is gradually increased from D3 at one end to D4 at the other end; the nut (2) further comprises a sealed dustproof cover (204), the sealed dustproof cover (204) is connected with one end of the nut body (201), the nut (2) is of a concave structure or a U-shaped structure, and locking barbs (6) are arranged in the sealed dustproof cover (204).

25. The self-tightening stud, nut tightening device according to claim 24, wherein: the inner diameter of one end of the internal thread structure (203) is D5, and the inner diameter of the other end of the internal thread structure (203) is D6; and D5> D6; the inner diameter of the internal thread structure (203) is gradually reduced from D5 at one end to D6 at the other end.

26. The self-tightening stud, nut tightening device according to claim 24, wherein: the inner diameter of two ends of the internal thread structure (203) is D5, and the inner diameter of the middle section of the internal thread structure (203) is D6; and D5> D6; the internal diameter of the internal thread structure (203) gradually becomes smaller and larger from D5 at one end to D6 at the middle part and then from D6 at the middle part to D5 at the other end.

27. Self-tightening stud and nut tightening device according to any one of claims 24 to 26, characterized in that: the tightening part (4) further includes: an installation guide head (403), wherein the installation guide head (403) is arranged on the end surface of the tightening part (4); the installation guide head (403) is coaxial with the tightening part (4); the installation guide head (403) and the connected outward warping body (401) are separated by a deformation pretension seam (402); the diameter of the installation guide head (403) after separation is D7; d1 is not less than D7 or D3 is not less than D7; and/or

Two ends of the stud main body (301) are provided with locking grooves (103); the locking groove (103) is arranged at the position of the deformation pretension seam (402).

28. Self-tightening stud and nut tightening device according to any one of claims 24 to 26, characterized in that: the tightening part (4) further includes: a torsion limiting post (404); the torsion limiting column (404) is arranged at the central position of the tightening part (4), and the deformation pretension seam (402) is arranged between the outward warping body (401) and the torsion limiting column (404); the outward warping body (401) is tightly attached to the torsion limiting column (404) after being gathered.

29. The self-tightening stud, nut tightening device according to claim 27, wherein: the tightening part (4) further includes: a torsion limiting post (404); the torsion limiting column (404) is arranged at the central position of the tightening part (4), and the deformation pretension seam (402) is arranged between the outward warping body (401) and the torsion limiting column (404); the outward warping body (401) is tightly attached to the torsion limiting column (404) after being gathered.

30. The self-tightening stud, nut tightening device according to claim 28, wherein: the torsion limiting column (404) is a polygonal prism.

31. The self-tightening stud, nut tightening device according to claim 29, wherein: the torsion limiting column (404) is a regular polygon prism.

32. Self-tightening stud, nut fastening device according to any one of claims 24-26, 29, 31, characterized in that: the axial line of the outward warping body (401) and the central axis of the tightening part (4) are in the same plane; or

33. The self-tightening stud, nut tightening device according to claim 27, wherein: the axial line of the outward warping body (401) and the central axis of the tightening part (4) are in the same plane; or

34. The self-tightening stud, nut tightening device according to claim 27, wherein: the end part of the external thread structure (5) and/or the installation guide head (403) is/are provided with a chamfer; chamfers are arranged at two ends of the nut through hole (202); and/or

35. A self-tightening stud, nut tightening device according to claim 29 or 33, wherein: the end part of the external thread structure (5) and/or the installation guide head (403) is/are provided with a chamfer; chamfers are arranged at two ends of the nut through hole (202); and/or

36. Self-tightening stud, nut fastening device according to any one of claims 24-26, 29, 31, 33, 34, characterized in that: the deformation pre-tension seam (402) is a straight line or a curve, and the width of the deformation pre-tension seam (402) is 0.01-50 mm; the width of the deformation pre-tension seam (402) gradually becomes wider from one end close to the stud body (301) to one end far away from the stud body (301).

37. The self-tightening stud, nut tightening device according to claim 36, wherein: the width of the deformation pretension seam (402) is 0.02-30 mm.

38. The self-tightening stud, nut tightening device according to claim 37, wherein: the width of the deformation pretension seam (402) is 0.03-20 mm.

39. The self-tightening stud, nut tightening device according to claim 27, wherein: the deformation pre-tension seam (402) is a straight line or a curve, and the width of the deformation pre-tension seam (402) is 0.01-50 mm; the width of the deformation pre-tension seam (402) gradually becomes wider from one end close to the stud body (301) to one end far away from the stud body (301).

40. The self-tightening stud, nut tightening device according to claim 39, wherein: the width of the deformation pretension seam (402) is 0.02-30 mm.

41. The self-tightening stud, nut tightening device according to claim 40, wherein: the width of the deformation pretension seam (402) is 0.03-20 mm.

42. A self-tightening stud, nut tightening device according to any one of claims 24-26, 29, 31, 33, 34, 37-41, wherein: the tightening part (4) is divided into 2-10 outward warping bodies (401) by the deformation pretension seam (402).

43. The self-tightening stud, nut tightening device according to claim 42, wherein: the screwing part (4) is divided into 3-8 outward warping bodies (401) by the deformation pretension seam (402).

44. The self-tightening stud, nut tightening device according to claim 43, wherein: the tightening part (4) is divided into 4-6 outward warping bodies (401) by the deformation pretension seam (402).

45. A self-tightening stud, nut tightening device according to any one of claims 24-26, 29, 31, 33, 34, 37-41, 43, 44, characterized in that: the tightening part (4) is made of elastic steel material; the self-tightening stud and the nut fastening device are both made of elastic steel materials.

46. The self-tightening stud, nut tightening device according to claim 27, wherein: the tightening part (4) is made of elastic steel material; the self-tightening stud and the nut fastening device are both made of elastic steel materials.