CN114483749B

CN114483749B - Fastener for automobile and using method thereof

Info

Publication number: CN114483749B
Application number: CN202210055061.2A
Authority: CN
Inventors: 王胜利
Original assignee: ZHEJIANG YUTAI AUTO PARTS CO Ltd
Current assignee: ZHEJIANG YUTAI AUTO PARTS CO Ltd
Priority date: 2022-01-18
Filing date: 2022-01-18
Publication date: 2023-12-22
Anticipated expiration: 2042-01-18
Also published as: CN114483749A

Abstract

The invention belongs to the technical field of fasteners, in particular to an automobile fastener and a using method thereof, wherein the automobile fastener comprises a first screw, a second screw, a third screw and a fourth screw; according to the invention, two parts are connected together through the fastener, and then the screw IV is rotated, so that the screw IV is extruded, the sealing cavity is expanded to the periphery, the connection strength of the screw IV and the threaded hole is increased, the connection strength of the screw IV and the threaded hole, and the connection strength of the screw III and the threaded hole are increased, so that the loosening probability of the fastener is reduced, and the connection strength of the two parts is increased; when the fastener and the installed part expand, the fastener can generate axial movement, so that the thread structure is prevented from being broken when the expansion is overlarge, and the loosening probability of the fastener is reduced; when dismantling, rotate the screw No. four earlier, and then reduce the pressure in the sealed chamber, and then reduce the effort between fastener and the screw hole, and then make things convenient for the demolition of fastener.

Description

Fastener for automobile and using method thereof

Technical Field

The invention belongs to the technical field of fasteners, and particularly relates to an automobile fastener and a using method thereof.

Background

The fastener is a part for connecting two or more parts or components together, is visible everywhere in industrial production, is more used on the automobile, has the advantages of convenient connection, convenient disassembly, reusability and the like, but because of the special property of threaded connection, gaps exist between threads, and because the road condition of the automobile walking is incomplete and uneven, when the automobile frequently walks on a bumpy road surface, the fastener is easy to loosen and even fall off under the effect of repeated vibration, so that the fastener is particularly important in anti-loosening.

The existing fastener is loose-proof, mainly from improving the processing and matching precision of threads, the gap between the threads is reduced to prevent the fastener from loosening, so that the reliability of fastener connection is improved, but the thread gap of the fastener cannot be too small, the processing cost and difficulty of the fastener and automobile parts can be increased when the gap is too small, the installation difficulty is increased, the automobile manufacturing cost is increased, and the temperature difference between the north and south is too large, and when the environment temperature is higher, or the high-temperature environment is at the fastener part on certain parts (such as an engine, a turbocharger and the like), the thermal expansion phenomenon is easy to generate, the fastener and parts expand, the threads or the parts are easy to be extruded, the loosening phenomenon is generated, the normal operation of an automobile is influenced, and the safety accident can be generated when the safety accident is serious.

Disclosure of Invention

In order to make up for the defects of the prior art, the invention provides an automobile fastener and a using method thereof. The invention is mainly used for solving the problems that the prior fastener mainly starts from improving the processing and matching precision of threads, the clearance between the threads is reduced to prevent the fastener from loosening, but the processing cost and difficulty of the fastener and automobile parts are increased when the clearance is too small, the installation difficulty is increased, the automobile manufacturing cost is increased, and the temperature difference between the north and south is too large, and the temperature difference between the winter and the summer is too large, when the environment temperature is higher, or the high temperature environment is generated at the fastener part on certain parts (such as an engine, a turbocharger and the like), the thermal expansion phenomenon is easy to generate, the fastener and the parts expand, the fastener and the parts are mutually extruded, the threads or the parts are easy to be broken, the normal operation of the automobile is influenced, and the safety accident is generated in serious cases.

The technical scheme adopted for solving the technical problems is as follows: the invention provides an automobile fastener, which comprises a first screw, a second screw, a third screw and a fourth screw, wherein the first screw is a screw; one end of the first screw is provided with a locking part and a limiting part; the locking part is arranged at the end part of the first screw; the other end of the first screw is provided with the second screw rod; one end of the second screw rod is connected with one end of the first screw; the other end of the second screw is provided with the third screw; one end of the third screw is connected with one end of the second screw; the threads of the screw I, the screw II and the screw III are on the same spiral line; the second screw is made of flexible materials; a sealing cavity is arranged in the second screw; the sealing cavity is annular; the sealing cavity is filled with liquid; a mounting groove is formed in the first screw; the fourth screw is arranged in the mounting groove; one end of the fourth screw is in threaded connection with the first screw; the other end of the fourth screw is close to the second screw.

During operation, two parts (one part is a part to be installed, a screw through hole is formed in the part to be installed, a screw hole is formed in the other part is a part to be installed), a fastener penetrates through the screw through hole of the part to be installed, a first screw is rotated to drive a second screw to rotate, a third screw is driven to rotate, the third screw is further twisted into the screw hole of the part to be installed, the second screw is further twisted into the screw hole, the first screw is further twisted into the screw hole, a limiting part is further abutted against the surface of the part to be installed, the first screw is then twisted tightly, the part to be installed is further tightly connected with the part to be installed, a fourth screw is then rotated, the fourth screw is further twisted into the second screw, and the fourth screw is further abutted against the surface of the second screw, the screw IV is continuously rotated to further move to the screw IV, the screw IV is further extruded to further extrude the screw IV, and because the screw IV is made of flexible materials, the sealing cavity II is filled with liquid, the screw IV is deformed under the extrusion effect of the screw IV, the liquid in the sealing cavity is further moved to the periphery, the inner wall of the sealing cavity is further expanded to the periphery, the acting force between the screw IV and the threaded hole is further increased, the acting force between the threaded structure of the screw IV and the threaded hole is further increased, the connecting strength between the screw IV and the threaded hole is further increased, the acting force of the screw IV and the screw IV on the two surfaces of the screw IV is simultaneously increased, the axial force between the screw IV and the threaded hole is further increased, further increasing the acting force between the thread structure of the first screw and the thread of the threaded hole, further increasing the friction force between the thread structure of the first screw and the thread of the threaded hole, further increasing the connection strength of the first screw and the threaded hole, and simultaneously increasing the axial force between the third screw and the threaded hole, further increasing the acting force between the thread structure of the third screw and the thread of the threaded hole, further increasing the friction force between the thread structure of the third screw and the thread of the threaded hole, further increasing the connection strength of the third screw and the threaded hole, further increasing the connection strength of the fastener, further reducing the loosening probability of the fastener, further increasing the connection strength of a part to be installed and the installed part, further realizing the reliable running of the part, and further realizing the reliable running of an automobile; the prior fastener is loose-proof, mainly from improving the processing and matching precision of threads, the gap between the threads is reduced to prevent the fastener from loosening, thereby increasing the reliability of the connection of the fastener, but the thread gap of the fastener cannot be too small, the processing cost and difficulty of the fastener and automobile parts can be increased when the gap is too small, the installation difficulty is increased, the automobile manufacturing cost is increased, and the connection strength of the second screw and the threaded hole, the connection strength of the third screw and the threaded hole can be further increased, the fastener loosening is further prevented, when the environmental temperature is higher, or the high-temperature environment of the fastener on certain parts (such as an engine, a turbocharger and the like), the thermal expansion phenomenon is easy to generate, the fastener and the part expand, the fastener and the part are mutually extruded, the threads or the parts are easy to be extruded, the loosening phenomenon is generated, the normal operation of the automobile is influenced, and the safety accident is generated when the fastener is seriously, the fastener extrudes a second screw made of flexible materials through a fourth screw, the expansion deformation is further generated, the connection strength of the second screw and the threaded hole is increased, the connection strength of the third screw and the threaded hole is further prevented, the fastener loosening, further the connection strength of the fastener is increased, the expansion is further realized, the possibility of the fastener and the fastener structure is further improved, the thread structure is prevented from being broken when the fastener is further expanded, the thread structure is further broken, the thread structure is further is broken, and the structure is further is improved, and the structure is broken when the fastener is broken and the fastener is mounted and the structure is mounted and the part is broken, the running reliability of the automobile is improved; at present, an adhesive is used for preventing a fastener from loosening, but the loosening method cannot remove the fastener, or the difficulty of removing the fastener is overlarge, when the fastener is removed, the screw IV is rotated firstly, so that the screw IV is separated from the screw II, the screw II is restored to the original shape, the pressure in a sealing cavity is reduced, the acting force between the screw II and a threaded hole, the acting force between the screw IV and the threaded hole, the acting force between the screw III and the threaded hole are reduced, the acting force between the fastener and the threaded hole is reduced, the screw IV is twisted later, the screw IV is driven to rotate, the screw IV and the screw IV are twisted out from the threaded hole in sequence, and the fastener is conveniently removed, so that the part is conveniently removed.

Preferably, one end of the first screw is provided with a first bulge structure; the first protruding structure is polygonal; the first protruding structure is arranged close to the second screw; a first groove is formed in the position, corresponding to the first protruding structure, of the second screw; the first groove is of a polygonal structure; the first protruding structure is in clamping connection with the first groove; one end of the third screw is provided with a second protruding structure; the second protruding structure is polygonal; the second protruding structure is arranged close to the second screw; a second groove is formed in the position, corresponding to the second protruding structure, of the second screw; the second groove is of a polygonal structure; the second protruding structure is in clamping connection with the second groove; and one end of the fourth screw which is abutted against the first groove is close to the bottom surface of the first groove.

Through a protruding structure with the block of recess is connected, and then makes things convenient for the connection of a screw and No. two screws, can transmit the moment of torsion between a protruding structure and No. one simultaneously, and then a screw is with the moment of torsion transmission for No. two screws, be connected through the block of No. two protruding structures and No. two recesses, and then make things convenient for No. two screws and No. three screws to connect, can transmit the moment of torsion between No. two protruding structures and No. two recesses simultaneously, and then No. two screws transmit the moment of torsion for No. three screws, and then make the moment of torsion transmit for No. two screws from a screw, and then transmit No. three screws from No. two screws, and then make No. one screw, no. two screws, no. three screws synchronous rotation, and then realize the locking of fastener.

Preferably, a baffle is arranged between the fourth screw and the bottom surface of the first groove; the baffle is clamped in the first groove; the baffle is abutted against the bottom surface of the first groove.

Through setting up the separation blade, and then avoid the direct contact of the bottom surface of screw No. four and recess, and then puncture the sealed chamber when preventing screw No. four and remove, and then prevent that the sealed chamber from producing the leakage because of puncturing, and then reduce the probability that sealed chamber took place to leak, and then realize the reliable inflation in sealed chamber, and then realize the reliable connection of fastener and screw hole, and then realize the reliable connection of part, the separation blade has increased the compression volume to the sealed chamber when screw No. four removes, and then increase the compression volume in sealed chamber, and then increase the pressure in sealed chamber, and then increase the effort between screw rod No. two and the screw hole, and then increase the axial force between screw rod No. one and the screw hole, and then increase the effort between screw rod No. three screw rods and the screw hole, and then increase the axial force between screw rod No. three screw rods and the screw hole, and then increase the joint strength of screw rod No. three and screw hole, and then increase the joint strength of fastener wait to increase the joint strength of screw rod and screw rod, and then increase the reliable connection of installation and realization of part, and then realize reliable operation.

Preferably, the bottom surface of the first groove is provided with a third protruding structure; a fourth protruding structure is arranged at the middle part of the baffle; the third protruding structure and the fourth protruding structure are mutually attached; the baffle is made of elastic metal sheets.

Through setting up No. three protruding structures, and then increase the volume of sealed chamber, and then increase the volume of sealed intracavity liquid, and then increase the sealed chamber by compression and produce the pressure after the inflation, and then increase the effort between the helicitic texture of No. two screws and the screw hole screw, and then increase the joint strength of No. two screws and screw hole, the axial force between screw and the screw hole increases simultaneously, and then increase the joint strength of screw and screw hole, the axial force between No. three screws and the screw hole increases simultaneously, and then increases the joint strength of No. three screws and screw hole, and then increases the joint strength of fastener and screw hole, and then increases the joint strength of waiting to install the part and installed the part, and then realizes the reliable operation of car.

Preferably, a limiting piece is arranged at the joint of the third protruding structure and the fourth screw; the edge of the limiting piece is abutted against the inner wall of the mounting groove; one end of the limiting piece is abutted against the fourth protruding structure.

Through setting up the locating part, and then make No. four screws contradict in the middle part of locating part, and then pass through the even transmission of locating part with effort and give No. three protruding structures, and then prevent No. four screws and directly pass effort to No. three protruding structures's one side, one side of No. three protruding structures is compressed this moment, and the opposite side inflation, lead to the total volume of sealed chamber unchanged or the change is less, can't increase the pressure in the sealed chamber, and then reduce the effort between the helicitic texture of fastener and the screw hole, and then reduce the joint strength between helicitic texture of fastener and the screw hole, and then increase the not hard up probability of fastener, and the locating part passes effort even transmission No. three protruding structures, and then prevent No. three protruding structures one side by the compression opposite side production inflation, and then make No. three protruding structures even compressed, and then increase the pressure in the sealed chamber, and then increase the effort between helicitic texture of fastener and the screw hole, and then increase the joint strength between the helicitic texture of fastener and the screw hole, and then reduce the not hard up probability of fastener.

Preferably, a first framework is arranged in the second screw; the first framework is polygonal; the first framework is arranged close to the side wall of the first groove; the first framework and the second screw are poured together; a second framework is arranged in the second screw; the second framework is polygonal; the second framework is arranged close to the side wall of the second groove; and the second framework and the second screw are poured together.

Through setting up a skeleton, and then a skeleton has increased the intensity of a recess lateral wall, and then reduce the deformation of a recess lateral wall, and then prevent a recess lateral wall and a protruding structure's piece production relative rotation, and then realize the reliable transmission of moment of torsion, and then with the reliable transmission of moment of torsion on the screw for No. two screws, simultaneously through setting up No. two firmware, and then No. two firmware has increased the intensity of No. two recess lateral walls, and then reduce the deformation of No. two recess lateral walls, and then prevent to produce relative rotation between No. two recess lateral walls and the protruding structure, and then realize the reliable transmission of moment of torsion, and then with the reliable transmission of No. two screws for No. three screws, and then make the moment of torsion follow No. one screw transmission for No. two screws, and then make No. one screw, no. two screws, no. three screws synchronous rotation, and then realize the locking of fastener.

Preferably, the third screw is provided with a regular hexagon groove.

When a part is required to be dismantled or inspected, the screw IV is reversely rotated, then the fastener is reversely rotated, the screw IV is reversely rotated, the screw II and the screw III are reversely rotated, the fastener is further removed from the threaded hole, when the sealing cavity leaks, the pressure in the sealing cavity is reduced, the strength of the screw II is reduced, the torque force cannot be transmitted to the screw III, the screw III cannot be removed, the screw III is twisted by the hexagonal wrench through the regular hexagonal groove arranged on the screw III, the screw III is further removed from the threaded hole, and the fastener III is further conveniently removed; when No. three screw rods rust, the torsion of No. two screw rods transmission can't twist No. three screw rods, and then can't accomplish the demolishment of No. three screw rods, with hexagonal wrench block in regular hexagon recess, and then twist No. three screw rods, and then accomplish No. three screw rods and demolish, and then convenient the next reentrant installation.

Preferably, the second screw is made of anti-aging wear-resistant materials.

Through setting up the wearing material of ageing resistance and making No. two screws, and then slowing down No. two ageing of screws, no. two prevent that No. two screws from making sealed chamber produce leakage because of ageing, and then reduce sealed chamber and take place the probability of leaking, and then realize sealed chamber's reliable inflation, and then realize the reliable connection of fastener and screw hole, and then realize the reliable connection of part, and simultaneously and prolong No. two screw's life, and then the life of extension fastener, and then avoid frequently changing No. two screws.

The invention also provides a using method of the fastener for the automobile, which comprises the following steps:

s1: moving the part to be installed to a position to be installed, enabling a screw through hole of the part to be installed to coincide with a threaded hole of the installed part, and then enabling the fastener to pass through the screw through hole, so that the third screw rod is abutted against an opening of the threaded hole of the installed part; two parts to be connected together (one part to be installed is provided with a screw through hole, the other part to be installed is provided with a threaded hole, and the other part to be installed is provided with a threaded hole) are placed at a proper position, so that the screw through hole of the part to be installed is overlapped with the threaded hole of the part to be installed, and then a fastener penetrates through the screw through hole of the part to be installed, so that the third screw is abutted against the opening of the threaded hole of the part to be installed.

S2: in the S1, after the third screw rod is abutted against the opening of the threaded hole of the part to be installed, the first screw rod is twisted, so that the third screw rod, the second screw rod and the first screw rod are twisted into the threaded hole of the part to be installed in sequence, then the fastener is continuously twisted, the limiting part is abutted against the surface of the part to be installed, the limiting part drives the part to be installed to move towards the part to be installed, then the fastener is continuously twisted until the part to be installed and the part to be installed are tightly attached together, and then the fastener is continuously screwed, so that the fastener generates pretightening force; the screw rod No. three is contradicted and is in the opening part of installed part screw hole after, twist a screw, and then drive No. two screw rods and rotate, and then drive No. three screw rods and rotate, and then make No. three screw rods twist into to the screw hole in the screw hole, and then make No. one screw rods twist into to the screw hole, and then make No. three screw rods and No. two screw rods twist into the screw hole completely, make a part of screw rods twist into the screw hole, and then make spacing portion conflict on the surface of waiting to install the part, continue to twist up the fastener, and then spacing portion drives waiting to install the part and remove to the installed part, and then make waiting to install the part closely laminating together with installed part, continue to screw up the fastener, and then make the fastener produce pretightning force, and then increase the axial force between screw and the screw hole, and then increase the effort between screw thread structure and the screw hole, and then increase the frictional force between screw thread structure and the screw hole thread structure, and then increase the joint strength of screw hole, and then reduce the probability that screw structure is loosened, and then reduce the part production probability, and then realize waiting to loosen the reliable connection of part and installation.

S3: after the pretightening force of the fastener in the S2 meets the requirement, stopping twisting the fastener, twisting the fourth screw to enable the fourth screw to be abutted against the second screw, and continuously twisting the fourth screw, wherein the fourth screw extrudes the second screw to enable the sealing cavity to expand to the periphery, and the second screw to expand to the periphery; after the fourth screw is screwed, stopping twisting the fourth screw; after the pretightening force of the fastener meets the requirement, the screw IV is rotated, the screw IV is twisted into the screw IV, the screw IV is further abutted against the surface of the screw IV, the screw IV is further rotated, the screw IV is further moved to the screw IV, the screw IV is further extruded, the screw IV is made of flexible materials, the sealing cavity II is filled with liquid, the screw IV is further deformed under the extrusion action of the screw IV, the liquid in the sealing cavity is further moved to the periphery, the inner wall of the sealing cavity is further expanded to the periphery, the acting force between the screw IV and the threaded hole is further increased, the acting force between the threaded structure of the screw IV and the threaded hole screw is further increased, the connection strength between the screw IV and the threaded hole is further increased, simultaneously increasing the acting force of two surfaces of the second screw rod on the first screw rod and the third screw rod respectively, further increasing the axial force between the first screw rod and the threaded hole, further increasing the acting force between the threaded structure of the first screw rod and the threaded hole, further increasing the friction force between the threaded structure of the first screw rod and the threaded hole, further increasing the connection strength of the first screw rod and the threaded hole, simultaneously increasing the axial force between the third screw rod and the threaded hole, further increasing the acting force between the threaded structure of the third screw rod and the threaded hole, further increasing the connection strength of the fastener, further reducing the loosening probability of the fastener, further increasing the connection strength of a part to be installed and the part to be installed, further realizing the reliable connection of the part, thereby realizing the reliable running of the automobile.

S4: when the fastener needs to be removed, reversely rotating the fourth screw to enable the fourth screw to be separated from the second screw, reversely rotating the first screw to enable the first screw, the second screw and the third screw to be sequentially twisted out of the threaded hole of the installed part, and taking out the fastener after the third screw is separated from the threaded hole, so that the removal of the fastener is completed; when the fastener needs to be removed, the fourth screw is rotated firstly, the fourth screw is separated from the second screw, the second screw is restored to the original shape, the pressure in the sealing cavity is reduced, the acting force between the second screw and the threaded hole, the acting force between the first screw and the threaded hole, the acting force between the third screw and the threaded hole are reduced, the acting force between the fastener and the threaded hole is reduced, the first screw is twisted later, the second screw is driven to rotate, the third screw is driven to rotate, the first screw, the second screw and the third screw are twisted out of the threaded hole in sequence, the third screw is separated from the threaded hole of the installed part, the fastener is taken out of the screw through hole of the part to be installed, the fastener is removed, and then the fastener is finished.

The beneficial effects of the invention are as follows:

1. in the invention, two parts (one part is a part to be installed, a screw through hole is formed in the part to be installed, a screw hole is formed in the other part which is a part to be installed), a fastener penetrates through the screw through hole of the part to be installed, a first screw is rotated to drive a second screw to rotate, a third screw is driven to rotate, the third screw is further twisted into the screw hole of the part to be installed, the second screw is further twisted into the screw hole, the first screw is further twisted into the screw hole, a limiting part is further abutted against the surface of the part to be installed, the first screw is then twisted, the part to be installed and the part to be installed are tightly connected, a fourth screw is then rotated, the fourth screw is further twisted into the second screw, and the fourth screw is further abutted against the surface of the second screw, the screw IV is continuously rotated to further move to the screw IV, the screw IV is further extruded to further extrude the screw IV, and because the screw IV is made of flexible materials, the sealing cavity II is filled with liquid, the screw IV is deformed under the extrusion effect of the screw IV, the liquid in the sealing cavity is further moved to the periphery, the inner wall of the sealing cavity is further expanded to the periphery, the acting force between the screw IV and the threaded hole is further increased, the acting force between the threaded structure of the screw IV and the threaded hole is further increased, the connecting strength between the screw IV and the threaded hole is further increased, the acting force of the screw IV and the screw IV on the two surfaces of the screw IV is simultaneously increased, the axial force between the screw IV and the threaded hole is further increased, further increasing the acting force between the thread structure of the first screw and the thread of the threaded hole, further increasing the friction force between the thread structure of the first screw and the thread of the threaded hole, further increasing the connection strength of the first screw and the threaded hole, and simultaneously increasing the axial force between the third screw and the threaded hole, further increasing the acting force between the thread structure of the third screw and the thread of the threaded hole, further increasing the friction force between the thread structure of the third screw and the thread of the threaded hole, further increasing the connection strength of the third screw and the threaded hole, further increasing the connection strength of the fastener, further reducing the loosening probability of the fastener, further increasing the connection strength of a part to be installed and the installed part, further realizing the reliable running of the part, and further realizing the reliable running of an automobile; the prior fastener is loose-proof, mainly from improving the processing and matching precision of threads, the gap between the threads is reduced to prevent the fastener from loosening, thereby increasing the reliability of the connection of the fastener, but the thread gap of the fastener cannot be too small, the processing cost and difficulty of the fastener and automobile parts can be increased when the gap is too small, the installation difficulty is increased, the automobile manufacturing cost is increased, and the connection strength of the second screw and the threaded hole, the connection strength of the third screw and the threaded hole can be further increased, the fastener loosening is further prevented, when the environmental temperature is higher, or the high-temperature environment of the fastener on certain parts (such as an engine, a turbocharger and the like), the thermal expansion phenomenon is easy to generate, the fastener and the part expand, the fastener and the part are mutually extruded, the threads or the parts are easy to be extruded, the loosening phenomenon is generated, the normal operation of the automobile is influenced, and the safety accident is generated when the fastener is seriously, the fastener extrudes a second screw made of flexible materials through a fourth screw, the expansion deformation is further generated, the connection strength of the second screw and the threaded hole is increased, the connection strength of the third screw and the threaded hole is further prevented, the fastener loosening, further the connection strength of the fastener is increased, the expansion is further realized, the possibility of the fastener and the fastener structure is further improved, the thread structure is prevented from being broken when the fastener is further expanded, the thread structure is further broken, the thread structure is further is broken, and the structure is further is improved, and the structure is broken when the fastener is broken and the fastener is mounted and the structure is mounted and the part is broken, the running reliability of the automobile is improved; at present, an adhesive is used for preventing a fastener from loosening, but the loosening method cannot remove the fastener, or the difficulty of removing the fastener is overlarge, when the fastener is removed, the screw IV is rotated firstly, so that the screw IV is separated from the screw II, the screw II is restored to the original shape, the pressure in a sealing cavity is reduced, the acting force between the screw II and a threaded hole, the acting force between the screw IV and the threaded hole, the acting force between the screw III and the threaded hole are reduced, the acting force between the fastener and the threaded hole is reduced, the screw IV is twisted later, the screw IV is driven to rotate, the screw IV and the screw IV are twisted out from the threaded hole in sequence, and the fastener is conveniently removed, so that the part is conveniently removed.

2. According to the invention, the first protruding structure is connected with the first groove in a clamping way, so that the connection of the first screw and the second screw is facilitated, meanwhile, the first protruding structure and the first screw can transmit torque, so that the first screw can transmit torque to the second screw, the second screw can be connected with the second groove in a clamping way, so that the connection of the second screw and the third screw is facilitated, meanwhile, the second protruding structure and the second groove can transmit torque, so that the second screw can transmit torque to the third screw, so that the torque is transmitted to the second screw from the first screw, and then transmitted to the third screw from the second screw, so that the first screw, the second screw and the third screw synchronously rotate, and the locking of the fastener is realized.

3. According to the invention, the baffle is arranged, so that the direct contact between the screw No. four and the bottom surface of the groove No. one is avoided, the sealing cavity is prevented from being pierced when the screw No. four moves, leakage is prevented from being generated due to piercing of the sealing cavity, the probability of leakage of the sealing cavity is reduced, reliable expansion of the sealing cavity is realized, reliable connection of a fastener and a threaded hole is realized, further reliable connection of a part is realized, the baffle increases the compression volume of the sealing cavity when the screw No. four moves, the compression amount of the sealing cavity is increased, further the pressure in the sealing cavity is increased, further the acting force between the screw No. two and the threaded hole is increased, further the acting force between the threaded structure of the screw No. two and the threaded hole is increased, meanwhile, the axial force between the threaded structure of the screw No. one and the threaded hole is increased, further the connecting strength between the screw No. one and the threaded hole is increased, meanwhile, the axial force between the threaded structure of the screw No. three and the threaded hole is increased, further the connecting strength between the screw No. three and the threaded hole is increased, further the connecting strength of the screw and the part is further reliably installed, further reliable operation of the part is realized.

4. According to the invention, the volume of the sealing cavity is increased by arranging the third protruding structure, the amount of liquid in the sealing cavity is increased, the pressure generated after the sealing cavity is compressed is increased, the acting force between the threaded structure of the second screw rod and the threads of the threaded hole is increased, the connection strength of the second screw rod and the threaded hole is increased, the axial force between the first screw rod and the threaded hole is increased, the connection strength of the first screw rod and the threaded hole is increased, the axial force between the third screw rod and the threaded hole is increased, the connection strength of a fastener and the threaded hole is increased, the connection strength of a part to be installed and the installed part is increased, the reliable running of the part is realized, and the reliable running of an automobile is realized.

5. According to the invention, the limiting piece is arranged, so that the fourth screw is abutted against the middle part of the limiting piece, acting force is uniformly transmitted to the third bulge structure through the limiting piece, the fourth screw is further prevented from directly transmitting the acting force to one side of the third bulge structure, at the moment, one side of the third bulge structure is compressed, the other side of the third bulge structure is expanded, the total volume of the sealing cavity is unchanged or is smaller in change, the pressure in the sealing cavity cannot be increased, the acting force between the threaded structure and the threaded hole of the fastener is reduced, the connection strength between the threaded structure and the threaded hole of the fastener is reduced, the loosening probability of the fastener is increased, the acting force is uniformly transmitted to the third bulge structure by the limiting piece, the expansion of one side of the third bulge structure is further prevented from being compressed, the third bulge structure is uniformly compressed, the pressure in the sealing cavity is further increased, the acting force between the threaded structure and the threaded hole of the fastener is further increased, the connection strength between the threaded structure and the threaded hole of the fastener is further increased, and the loosening probability of the fastener is further reduced.

Drawings

The invention is further described below with reference to the accompanying drawings.

FIG. 1 is a schematic view of the overall construction of the fastener of the present invention;

FIG. 2 is a schematic view of the fastener of the present invention in connection with a fastener;

FIG. 3 is an enlarged view of a portion of FIG. 2 at A;

FIG. 4 is a partial enlarged view at B in FIG. 2;

FIG. 5 is a schematic view showing the internal structure of a first screw according to the present invention;

FIG. 6 is a schematic view of the internal structure of a screw No. II according to the present invention;

FIG. 7 is a schematic view of a baffle plate according to the present invention;

FIG. 8 is a schematic view of the structure of a third screw of the present invention;

in the figure: screw 1, locking portion 11, spacing portion 12, mounting groove 13, protruding structure 14, screw 2 No. two, sealed chamber 21, recess 22 No. three protruding structure 221, recess 23 No. two, skeleton 24 No. two, skeleton 25 No. three screw 3, protruding structure 31 No. two, regular hexagon recess 32, screw 4 No. four, separation blade 5, protruding structure 51 No. four, locating part 6.

Detailed Description

The invention is further described in connection with the following detailed description in order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the invention easy to understand.

As shown in fig. 1, 2, 3, 4, 5, 6 and 8, a fastener for an automobile includes a first screw 1, a second screw 2, a third screw 3 and a fourth screw 4; one end of the first screw 1 is provided with a locking part 11 and a limiting part 12; the locking part 11 is arranged at the end part of the first screw 1; the other end of the first screw 1 is provided with the second screw rod 2; one end of the second screw rod 2 is connected with one end of the first screw 1; the other end of the second screw rod 2 is provided with the third screw rod 3; one end of the third screw rod 3 is connected with one end of the second screw rod 2; the threads of the screw 1, the screw 2 and the screw 3 are on the same spiral line; the second screw rod 2 is made of flexible materials; a sealing cavity 21 is arranged in the second screw rod 2; the sealing cavity 21 is annular; the sealing cavity 21 is filled with liquid; a mounting groove 13 is formed in the first screw 1; the fourth screw 4 is arranged in the mounting groove 13; one end of the fourth screw 4 is in threaded connection with the first screw 1; the other end of the fourth screw 4 is arranged close to the second screw 2.

During operation, two parts (one part is a part to be installed, a screw through hole is formed in the part to be installed, a screw hole is formed in the other part is a part to be installed), a fastener penetrates through the screw through hole of the part to be installed, the first screw 1 is rotated to drive the second screw 2 to rotate to drive the third screw 3 to rotate, the third screw 3 is twisted into the screw hole of the part to be installed, the second screw 2 is twisted into the screw hole, the first screw 1 is twisted into the screw hole, the limiting part 12 is abutted against the surface of the part to be installed, the first screw 1 is twisted, the part to be installed and the part to be installed are tightly connected, the fourth screw 4 is rotated to twist the fourth screw 2, the screw 4 is further abutted against the surface of the screw 2, the screw 4 is further rotated, the screw 4 is further moved to the screw 2, the screw 2 is further extruded, the screw 2 is made of flexible materials, the sealing cavity 21 is filled with liquid, the screw 2 is further deformed under the extrusion action of the screw 4, the liquid in the sealing cavity 21 is further moved to the periphery, the inner wall of the sealing cavity 21 is further expanded to the periphery, the acting force between the screw 2 and the threaded hole is further increased, the acting force between the threaded structure of the screw 2 and the threaded hole is further increased, the connecting strength between the screw 2 and the threaded hole is further increased, simultaneously, the acting force of two surfaces of the second screw rod 2 on the first screw rod 1 and the third screw rod 3 is increased, the axial force between the first screw rod 1 and the threaded hole is further increased, the acting force between the threaded structure of the first screw rod 1 and the threaded hole is further increased, the friction force between the threaded structure of the first screw rod 1 and the threaded hole is further increased, the connection strength between the first screw rod 1 and the threaded hole is further increased, the axial force between the third screw rod 3 and the threaded hole is further increased, the acting force between the threaded structure of the third screw rod 3 and the threaded hole is further increased, the friction force between the threaded structure of the third screw rod 3 and the threaded hole is further increased, the connection strength of a fastener is further increased, the loosening probability of the fastener is further reduced, the connection strength of a part to be installed and the installed part is further increased, reliable running of the part is further realized, and reliable running of an automobile is further realized; the prior fastener is loose-proof, mainly from improving the processing and matching precision of threads, the clearance between the threads is reduced to prevent the fastener from loosening, thereby increasing the reliability of the connection of the fastener, but the thread clearance of the fastener cannot be too small, the processing cost and difficulty of the fastener and automobile parts can be increased when the clearance is too small, the installation difficulty is increased, the automobile manufacturing cost is increased, and the connection strength of the fastener is further increased when the environmental temperature is higher or the high-temperature environment of the fastener on certain parts (such as an engine, a turbocharger and the like) is too large due to the excessive temperature difference in winter and summer, the thermal expansion phenomenon is easy to generate, the fastener and the part are expanded, the fastener and the part are mutually extruded, the threads or the parts are easy to be broken, the loosening phenomenon is generated, the normal operation of an automobile is influenced, and a safety accident is generated when the fastener is serious, the fastener extrudes a second screw rod 2 made of flexible materials through a fourth screw 4, the expansion deformation is generated, the connection strength of the second screw rod 2 and the threaded hole is increased, the connection strength of the third screw rod 3 and the threaded hole is further prevented from loosening, the connection strength of the fastener is further increased, the connection structure of the fastener to be realized, the fastener is further the probability of the installation structure is reduced when the fastener and the thread structure is broken, the thread structure is further expanded, the thread structure is broken is prevented from being broken, and the installation structure is further avoided to be broken, and the part is broken, and the structure is broken due to the movement of the part is broken and the installation structure is caused, further improving the reliability of the fastener and the running reliability of the automobile; at present, an adhesive is used for preventing a fastener from loosening, but the loosening method cannot remove the fastener, or the difficulty of removing the fastener is overlarge, when the fastener is removed, the screw 4 is rotated firstly, so that the screw 4 is separated from the screw 2, the screw 2 is restored to the original shape, the pressure in the sealing cavity 21 is reduced, the acting force between the screw 2 and the threaded hole, the acting force between the screw 1 and the threaded hole and the acting force between the screw 3 and the threaded hole are reduced, the acting force between the fastener and the threaded hole is reduced, the screw 1 is then twisted, the screw 2 is driven to rotate, the screw 3 is driven to rotate, and the screw 1, the screw 2 and the screw 3 are sequentially twisted out of the threaded hole, so that the fastener is conveniently removed, and the part is conveniently removed.

As shown in fig. 1, 3, 4, 5, 6 and 8, one end of the first screw 1 is provided with a first protrusion structure 14; the first bump structure 14 is polygonal; the first protruding structure 14 is arranged close to the second screw rod 2; a first groove 22 is formed in the position, corresponding to the first protruding structure 14, of the second screw rod 2; the first groove 22 has a polygonal structure; the first protruding structure 14 is in snap connection with the first groove 22; a second protruding structure 31 is arranged at one end of the third screw 3; the second bump structure 31 is polygonal; the second protruding structure 31 is arranged close to the second screw rod 2; a second groove 23 is formed in the position, corresponding to the second protruding structure 31, of the second screw 2; the second groove 23 has a polygonal structure; the second protruding structure 31 is in snap connection with the second groove 23; one end of the fourth screw 4 abutting against the first groove 22 is arranged close to the bottom surface of the first groove.

Through a protruding structure 14 with the block of recess 22 is connected, and then make things convenient for the connection of a screw 1 and No. two screw rods 2, can transmit the moment of torsion between a protruding structure 14 and No. one simultaneously, and then a screw 1 is with moment of torsion transmission for No. two screw rods 2, be connected through the block of No. two protruding structure 31 and No. two recess 23, and then make things convenient for the connection of No. two screw rods 2 and No. three screw rods 3, can transmit the moment of torsion between No. two protruding structure 31 and No. two recess 23 simultaneously, and then No. two screw rods 2 are with moment of torsion transmission for No. three screw rods 3, and then make moment of torsion transmit for No. two screw rods 2 from No. 1, no. two screw rods 2, no. three screw rods 3 synchronous rotation, and then realize the locking of fastener.

As shown in fig. 1, 4, 6 and 7, a baffle 5 is arranged between the fourth screw 4 and the bottom surface of the first groove 22; the baffle 5 is clamped in the first groove 22; the baffle 5 abuts against the bottom surface of the first groove 22.

Through setting up separation blade 5, and then avoid the direct contact of the bottom surface of screw 4 and recess 22 No. four, and then puncture sealed chamber 21 when preventing screw 4 from moving, and then prevent sealed chamber 21 from producing the leakage because of puncturing, and then reduce sealed chamber 21 and take place the probability of leaking, and then realize sealed chamber 21's reliable inflation, and then realize the reliable connection of fastener and screw hole, and then realize the reliable connection of part, the separation blade 5 has increased the compression volume to sealed chamber 21 when screw 4 removes, and then increase sealed chamber 21's compression volume, and then increase the pressure in sealed chamber 21, and then increase the effort between screw 2 and the screw hole, and then increase the effort between screw structure and the screw hole of screw 2 No. two, and then increase the joint strength of screw 1 and screw hole, and then increase the effort between screw structure and the screw hole screw 1, and then increase the joint strength of screw 1 and screw hole, and then increase the axial force between screw 3 and the screw hole, and then increase the reliable connection of screw 3 and screw hole, and then realize the reliable connection of the automobile parts.

As shown in fig. 1, 4, 6 and 7, the bottom surface of the first groove 22 is provided with a third protruding structure 221; a fourth protruding structure 51 is arranged in the middle of the baffle 5; the third protrusion 221 and the fourth protrusion 51 are attached to each other; the baffle 5 is made of elastic metal sheets.

Through setting up No. three protruding structure 221, and then increase the volume of sealed chamber 21, and then increase the volume of sealed intracavity 21 liquid, and then increase the pressure after sealed chamber 21 is compressed and produce the inflation, and then increase the effort between the helicitic texture of No. two screw rods 2 and the screw hole screw thread, and then increase the joint strength of No. two screw rods 2 and screw hole, increase the axial force between screw 1 and the screw hole simultaneously, and then increase the joint strength of screw 1 and screw hole, and simultaneously increase the axial force between No. three screw rods 3 and the screw hole, and then increase the joint strength of screw 3 and screw hole, and then increase the joint strength of fastener and screw hole, and then increase the joint strength of waiting to install the part and installed part, and then realize the reliable operation of car.

As shown in fig. 1, 4, 6 and 7, a limiting piece 6 is arranged at the joint of the third protruding structure 221 and the fourth screw 4; the edge of the limiting piece 6 is abutted against the inner wall of the mounting groove 13; one end of the limiting piece 6 abuts against the fourth protruding structure 51.

Through setting up locating part 6, and then make No. four screw 4 contradict in the middle part of locating part 6, and then with effort through the even transmission of locating part 6 for No. three protruding structures 221, and then prevent No. four screw 4 and directly transmit effort to No. three protruding structures 221's one side, no. three protruding structures 221's one side is compressed this moment, and the opposite side inflation, the total volume that leads to sealed chamber 21 is unchangeable or change is less, can't increase the pressure in the sealed chamber 21, and then reduce the effort between the helicitic texture of fastener and the screw hole, and then reduce the joint strength between helicitic texture of fastener and the screw hole, and then increase the not hard up probability of fastener, and No. three protruding structures 221 are given with effort even transmission to the effort to limiter 6, and then prevent No. three protruding structures 221 one side from being compressed the opposite side and then make No. three protruding structures 221 even compressed, and then increase the pressure in the sealed chamber 21, and then increase the effort between the helicitic texture of fastener and the screw hole, and then increase the joint strength between the helicitic texture of fastener and the screw hole, and then reduce the not hard up probability of fastener.

As shown in fig. 6, a first framework 24 is arranged in the second screw 2; the first frame 24 is polygonal; the first skeleton 24 is disposed near the side wall of the first groove 22; the first framework 24 and the second screw 2 are poured together; a second framework 25 is arranged in the second screw rod 2; the second skeleton 25 is polygonal; the second skeleton 25 is arranged near the side wall of the second groove 23; and the second framework 25 and the second screw rod 2 are poured together.

Through setting up skeleton 24, and then skeleton 24 has increased the intensity of recess 22 lateral wall, and then reduce the deformation of recess 22 lateral wall, and then prevent that recess 22 lateral wall and the piece of protruding structure 14 from producing relative rotation, and then realize the reliable transmission of moment of torsion, and then the moment of torsion on screw 1 reliably transmits for screw 2 No. two, simultaneously through setting up No. two firmware, and then the intensity of recess 23 lateral wall has been increased to No. two firmware, and then reduce the deformation of recess 23 lateral wall No. two, and then prevent to produce relative rotation between recess 23 lateral wall and the protruding structure 31 No. two, and then realize the reliable transmission of moment of torsion, and then transmit No. three screw 3 with the reliable transmission of moment of torsion of screw 2 No. two screw 2, and then make the moment of torsion transmit for screw 3 from screw 1 No. two screw 2, and then transmit for screw 3 from screw 2 No. two, and then make screw 1, screw 2, screw 3 synchronous rotation, and then realize the locking of fastener.

As shown in fig. 1, 4 and 8, the third screw 3 is provided with a regular hexagonal groove 32.

When a part is required to be removed or checked, the screw 4 is reversely rotated, then the fastener is reversely rotated, the screw 1 is reversely rotated, the screw 2 and the screw 3 are reversely rotated, the fastener is further removed from the threaded hole, when the pressure in the sealing cavity 21 is reduced due to leakage of the sealing cavity 21, the strength of the screw 2 is reduced, the torque force cannot be transmitted to the screw 3, the screw 3 cannot be removed, the screw 3 is further prevented from being removed, the screw 3 is further twisted by a hexagonal wrench through the regular hexagonal groove 32 arranged on the screw 3, the screw 3 is further removed from the threaded hole, and the screw 3 is further conveniently removed, so that the fastener is conveniently removed; when screw rod 3 rust No. three, the torsion of No. two screw rods 2 transmission can't twist screw rod 3 No. three, and then can't accomplish when dismantling of screw rod 3 No. three, with hexagonal wrench block in regular hexagon recess 32, and then twist screw rod 3 No. three, and then accomplish screw rod 3 and demolish, and then make things convenient for the installation of reentrant next time.

As shown in fig. 1, 4 and 6, the second screw 2 is made of an anti-aging wear-resistant material.

Through setting up the wear-resisting material of ageing resistance and making No. two screw rods 2, and then slow down No. two screw rods 2's ageing, no. two prevent that No. two screw rods 2 from making sealed chamber 21 produce leakage because of ageing, and then reduce sealed chamber 21 and take place the probability of leaking, and then realize sealed chamber 21's reliable inflation, and then realize the reliable connection of fastener and screw hole, and then realize the reliable connection of part, and simultaneously and the life of extension No. two screw rods 2, and then the life of extension fastener, and then avoid frequently changing No. two screw rods 2.

As shown in fig. 1, 2, 3, 4, 5, 6 and 8, the method for using a fastener for an automobile according to the present invention comprises the steps of:

s1: moving the part to be installed to a position to be installed, enabling a screw through hole of the part to be installed to coincide with a threaded hole of the installed part, then enabling the fastener to pass through the screw through hole, and enabling the third screw 3 to be abutted against an opening of the threaded hole of the installed part; two parts to be connected together (one part to be installed is provided with a screw through hole, the other part to be installed is provided with a threaded hole, and the other part to be installed is provided with a threaded hole) are placed at a proper position, so that the screw through hole of the part to be installed is overlapped with the threaded hole of the part to be installed, then a fastener penetrates through the screw through hole of the part to be installed, and the third screw 3 is abutted against the opening of the threaded hole of the part to be installed.

S2: in the S1, after the third screw rod 3 is abutted against the opening of the threaded hole of the part to be installed, the first screw rod 1 is twisted, so that the third screw rod 3, the second screw rod 2 and the first screw rod 1 are twisted into the threaded hole of the part to be installed in sequence, then the fastener is continuously twisted, the limiting part 12 is abutted against the surface of the part to be installed, the limiting part 12 drives the part to be installed to move towards the part to be installed, then the fastener is continuously twisted until the part to be installed and the part to be installed are tightly attached together, and then the fastener is continuously screwed, so that the fastener generates pretightening force; the screw 3 is propped against the opening of the threaded hole of the installed part, the screw 1 is twisted, the screw 2 is driven to rotate, the screw 3 is further driven to twist into the threaded hole of the installed part, the screw 2 is further driven to twist into the threaded hole, the screw 1 is further driven to twist into the threaded hole, the screw 3 and the screw 2 are further driven to completely twist into the threaded hole, a part of the screw 1 is driven to twist into the threaded hole, the limiting part 12 is further propped against the surface of the part to be installed, then the fastener is continuously twisted, the limiting part 12 drives the part to be installed to move towards the installed part, the part to be installed is further made to be tightly attached to the installed part, the fastener is continuously screwed, the fastener is further made to generate pretightening force, further axial force between the screw 1 and the threaded hole is increased, further acting force between the screw 1 thread structure and the threaded hole thread structure is increased, further the connection strength of the screw 1 and the threaded hole is increased, further probability of the screw 1 and the threaded hole is reduced, the part to be installed is further reduced, and the loose part to be installed is further realized.

S3: after the pretightening force of the fastener in the step S2 meets the requirement, stopping twisting the fastener, twisting the fourth screw 4 to enable the fourth screw 4 to be abutted against the second screw 2, and continuously twisting the fourth screw 4, wherein the fourth screw 4 extrudes the second screw 2 to enable the sealing cavity 21 to expand to the periphery, and the second screw 2 to expand to the periphery; after the fourth screw 4 is twisted, the twisting of the fourth screw 4 is stopped; after the pretightening force of the fastener reaches the requirement, the screw 4 is rotated, and then the screw 4 is twisted into the screw 2, and then the screw 4 is made to abut against the surface of the screw 2, and then the screw 4 is made to move towards the screw 2, and then the screw 2 is extruded, and the screw 2 is made of flexible materials, and the sealing cavity 21 is filled with liquid, and then the screw 2 deforms under the extrusion action of the screw 4, and then the liquid in the sealing cavity 21 moves around, and then the inner wall of the sealing cavity 21 expands around, and then the acting force between the screw 2 and the threaded hole is increased, and then the acting force between the threaded structure of the screw 2 and the threaded hole is increased, and then the connecting strength between the screw 2 and the threaded hole is increased, and then the axial force between the screw 1 and the threaded hole is increased, and further the friction between the screw 3 is increased, and the screw 3 is increased, and then increase the joint strength of the part to be installed and the installed part, and then realize the reliable connection of the part, and then realize the reliable operation of car.

S4: when the fastener needs to be removed, reversely rotating the fourth screw 4 to enable the fourth screw 4 to be separated from the second screw rod 2, reversely rotating the first screw 1 to enable the first screw 1, the second screw rod 2 and the third screw rod 3 to be sequentially twisted out of a threaded hole of an installed part, and taking out the fastener after the third screw rod 3 is separated from the threaded hole, so that the removal of the fastener is completed; when the fastener needs to be removed, the screw 4 is rotated firstly, the screw 4 is separated from the screw 2, the screw 2 is restored to the original shape, the pressure in the sealing cavity 21 is reduced, the acting force between the screw 2 and the threaded hole, the acting force between the screw 1 and the threaded hole, the acting force between the screw 3 and the threaded hole, the acting force between the fastener and the threaded hole are reduced, the screw 1 is then twisted, the screw 2 is driven to rotate, the screw 3 is driven to rotate, the screw 1, the screw 2 and the screw 3 are sequentially twisted out of the threaded hole, the screw 3 is removed from the threaded hole of the installed part, the fastener is taken out from the screw through hole of the part to be installed, and then the removal of the fastener is completed.

The embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those having ordinary skill in the art without departing from the spirit of the present invention and the scope of the claims, which are to be protected by the present invention.

Claims

1. A fastener for an automobile, characterized in that: the screw comprises a first screw (1), a second screw (2), a third screw (3) and a fourth screw (4); one end of the first screw (1) is provided with a locking part (11) and a limiting part (12); the locking part (11) is arranged at the end part of the first screw (1); the other end of the first screw (1) is provided with the second screw (2); one end of the second screw rod (2) is connected with one end of the first screw (1); the other end of the second screw (2) is provided with the third screw (3); one end of the third screw (3) is connected with one end of the second screw (2); the threads of the screw I (1), the screw II (2) and the screw III (3) are on the same spiral line; the second screw (2) is made of flexible materials; a sealing cavity (21) is arranged in the second screw (2); the sealing cavity (21) is annular; the sealing cavity (21) is filled with liquid; a mounting groove (13) is formed in the first screw (1); the fourth screw (4) is arranged in the mounting groove (13); one end of the fourth screw (4) is in threaded connection with the first screw (1); the other end of the fourth screw (4) is close to the second screw (2).

2. A fastener for an automobile according to claim 1, wherein: one end of the first screw (1) is provided with a first bulge structure (14); the first protruding structure (14) is in a polygonal shape; the first protruding structure (14) is arranged close to the second screw (2); a first groove (22) is formed in the position, corresponding to the first protruding structure (14), of the second screw (2); the first groove (22) is of a polygonal structure; the first protruding structure (14) is in clamping connection with the first groove (22); one end of the third screw (3) is provided with a second protruding structure (31); the second protruding structure (31) is in a polygonal shape; the second protruding structure (31) is arranged close to the second screw (2); a second groove (23) is formed in the position, corresponding to the second protruding structure (31), of the second screw (2); the second groove (23) is of a polygonal structure; the second protruding structure (31) is in clamping connection with the second groove (23); one end of the fourth screw (4) which is abutted against is close to the bottom surface of the first groove (22).

3. A fastener for an automobile according to claim 2, wherein: a baffle (5) is arranged between the fourth screw (4) and the bottom surface of the first groove (22); the baffle (5) is clamped in the first groove (22); the baffle (5) is abutted against the bottom surface of the first groove (22).

4. A fastener for an automobile according to claim 3, wherein: a third protruding structure (221) is arranged on the bottom surface of the first groove (22); a fourth protruding structure (51) is arranged at the middle part of the baffle (5); the third protruding structure (221) and the fourth protruding structure (51) are mutually attached; the baffle (5) is made of elastic metal sheets.

5. A fastener for an automobile according to claim 4, wherein: a limiting piece (6) is arranged at the joint of the third protruding structure (221) and the fourth screw (4); the edge of the limiting piece (6) is abutted against the inner wall of the mounting groove (13); one end of the limiting piece (6) is abutted against the fourth protruding structure (51).

6. A fastener for an automobile according to claim 5, wherein: a first framework (24) is arranged in the second screw (2); the first framework (24) is in a polygonal shape; the first framework (24) is arranged close to the side wall of the first groove (22); the first framework (24) and the second screw (2) are poured together; a second framework (25) is arranged in the second screw (2); the second framework (25) is in a polygonal shape; the second framework (25) is arranged close to the side wall of the second groove (23); and the second framework (25) and the second screw (2) are poured together.

7. A fastener for an automobile according to claim 6, wherein: and a regular hexagon groove (32) is formed in the third screw (3).

8. A fastener for an automobile according to claim 7, wherein: the second screw (2) is made of an anti-aging wear-resistant material.

9. A method of using a fastener for an automobile, adapted to the fastener of any one of claims 1 to 8, characterized in that: the method comprises the following steps:

s1: moving the part to be installed to a position to be installed, enabling a screw through hole of the part to be installed to coincide with a threaded hole of the installed part, then enabling the fastener to pass through the screw through hole, and enabling the third screw (3) to be abutted against an opening of the threaded hole of the installed part;

s2: in the S1, after the third screw rod (3) is abutted against the opening of the threaded hole of the part to be installed, the first screw rod (1) is twisted, so that the third screw rod (3), the second screw rod (2) and the first screw rod (1) are twisted into the threaded hole of the part to be installed in sequence, then the fastener is continuously twisted, the limiting part (12) is abutted against the surface of the part to be installed, the limiting part (12) drives the part to be installed to move towards the part to be installed, then the fastener is continuously twisted until the part to be installed and the part to be installed are tightly attached together, and then the fastener is continuously screwed, so that the fastener generates a pre-tightening force;

S3: after the pretightening force of the fastener in the step S2 meets the requirement, stopping twisting the fastener, then twisting the No. four screw (4) to enable the No. four screw (4) to be abutted against the No. two screw (2), and then continuing to twist the No. four screw (4), wherein the No. four screw (4) extrudes the No. two screw (2) to enable the sealing cavity (21) to expand to the periphery, and the No. two screw (2) to expand to the periphery; after the fourth screw (4) is twisted, the twisting of the fourth screw (4) is stopped;

s4: when the fastener needs to be removed, the fourth screw (4) is reversely rotated, the fourth screw (4) is separated from the second screw (2), then the first screw (1) is reversely rotated, the first screw (1), the second screw (2) and the third screw (3) are sequentially twisted out of threaded holes of installed parts, and after the third screw (3) is separated from the threaded holes, the fastener is taken out, so that the removal of the fastener is completed.