CN211623929U

CN211623929U - Elastic thread anti-loosening fastening device

Info

Publication number: CN211623929U
Application number: CN201921701110.5U
Authority: CN
Inventors: 李武彬
Original assignee: Individual
Current assignee: Jiangsu Hanzhijin Technology Co ltd
Priority date: 2019-10-11
Filing date: 2019-10-11
Publication date: 2020-10-02
Anticipated expiration: 2029-10-11

Abstract

The utility model discloses an elastic thread anti-loose fastening device, which comprises a fastening thread body and an elastic thread body; the fastening thread body is provided with common threads; the elastic thread body is connected with the fastening thread body in an interference fit mode through threads, and is provided with a thread shape which is different from the thread shape angle of the fastening thread body. The utility model discloses utilize the locking force that elastic deformation produced behind the elastic thread interference fit for the vice profile angle both sides meshing department of screw thread produces the huge frictional resistance of even, being covered with whole meshing periphery, guarantees that each link screw thread pair is not hard up under the various adverse operating environment such as frequent vibration and load change, plays the effect of real locking. The utility model discloses simple structure, intensity are big, stability is high, manufacturing process is simple, reusability, is fit for the locking fastening demand of high requirement under the various conditions.

Description

Elastic thread anti-loosening fastening device

Technical Field

The utility model relates to a make processing technology field, especially relate to an elasticity screw locking fastener.

Background

In production life, the threaded fastener is usually not detached in the connection and assembly process, and brings convenience to the mechanical industry. In the connection assembly, the screw connection mode is the most common fastening structure, but the screw connection mode has an inevitable weakness that the screw thread can be automatically loosened in the environment of severe vibration and variable load, so that a part or a complete device is damaged and disintegrated, and even a safety accident is caused. To solve the problem of loosening of threaded fasteners, many scientists and engineers in many countries around the world have conducted extensive experimentation and research since the birth of threaded fasteners. The anti-loosening of the thread is from abroad, and special engineering plastics are permanently attached to the thread, so that the engineering plastics are extruded to generate strong reaction force in the process of tightening the internal thread and the external thread, and the friction force between the internal thread and the external thread is greatly increased.

The existing domestic screw thread anti-loosening methods are various, wherein the method for increasing the friction force comprises the methods of arranging a pressure point nut, a locking washer, a fastening nut, a nylon insert, chemical gluing and the like, but the reliability is unstable under the conditions of heavy load, severe vibration and severe environment; mechanical anti-loosening methods such as slotted nuts, split pins, stop washers, steel wire tandem connection, concave cone locking and the like are limited by structures and cannot be used repeatedly; the anti-loosening method comprises eccentric nut anti-loosening, cone pressing and holding type anti-loosening, Tang's anti-loosening, elastic pressing type anti-loosening and interlocking type anti-loosening, and cannot be widely applied due to complex manufacturing and high cost, and the main body can be cracked and damaged under the condition of large torsion, so that the problems cannot be fundamentally solved, and potential safety hazards can be caused.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the technical problem who solves has overcome prior art's not enough, provides an elasticity screw locking fastener, in order to solve above-mentioned technical problem, the utility model discloses a technical scheme as follows: comprises a fastening thread body provided with common threads; the elastic thread body is provided with an elastic thread which is matched and connected with the elastic thread body, and the tooth form angle of the elastic thread is different from that of the common thread.

Furthermore, the angles of two sides of the elastic thread of the fastening device are different from the angle of the common thread.

Furthermore, the elastic thread is connected with the common thread in an interference fit manner.

Further, the pitch of the elastic thread is equal to the pitch of the normal thread.

Further, the pitch of the elastic thread is not equal to the pitch of the normal thread.

Furthermore, the change value of the elastic thread angle is within +/-15 degrees.

Furthermore, the cross section of the elastic thread is irregular and irregular.

Furthermore, the range value of the pitch difference is within +/-0.5 mm.

The utility model has the advantages as follows:

1. reliable anti-seismic and anti-loosening performance; the mutual locking between the threads at any position is realized;

2. the product cost can be greatly reduced, and the market space is improved;

3. the locking force of screwing in and screwing out can be realized, and the purpose of not loosening the nut is achieved;

4. can be repeatedly used for no limited time; the service cycle of the workpiece is greatly prolonged;

5. the device is not influenced by severe changes of temperature and working conditions, and has wide application environment range;

6. any metal and nonmetal can be selected, and the limitation of materials, shapes and dimension is realized;

7. all connecting threads can be matched; and seamless matching with each connecting thread is realized.

Drawings

FIG. 1 is a structural diagram of the device of the present invention

FIG. 2 is a schematic view of a common thread of the present invention

FIG. 3 is a schematic view of the elastic thread of the present invention

FIG. 4 is a schematic view of embodiment 1 of the present invention

FIG. 5 is a schematic view of embodiment 2 of the present invention

FIG. 6 is a schematic view of embodiment 3 of the present invention

FIG. 7 is a schematic view of embodiment 3 of the present invention

Reference numbers in the figures: 1-fastening a threaded body; 2-an elastic thread body; 3-common thread; 4-elastic threads; a1, A2-angles on two sides of a common thread form, a1, a 2-angles on two sides of an elastic thread form, P-thread pitch, d1 and d 2-contact surfaces of the elastic thread and two sides of the common thread form.

Detailed Description

To facilitate the understanding and practice of the present invention for those skilled in the art, the following detailed description of the present invention is provided in connection with the accompanying drawings and the detailed description.

As shown in fig. 1, 2 and 3, the device is an elastic thread anti-loose fastening device. Comprises a fastening thread body and an elastic thread body; the fastening thread body is provided with common threads; the elastic thread body is provided with an elastic thread, and the thread form angle is different from the thread form angle of a common thread; the elastic thread is connected with the common thread in a matching way.

Example 1:

as shown in fig. 1 and 4, the elastic thread angle a1 is smaller than the ordinary thread angle a1, the elastic thread angle a2 is smaller than the ordinary thread angle a2, a1 is larger than a2, the thread pitches P of the mating threads are the same, and the threaded connection adopts an interference fit connection mode. When the elastic thread is screwed into the common thread, angles of two sides of the tooth form of the common thread are larger than those of the elastic thread, two sides of the elastic thread can be stretched along with the continuous screwing of two sides of the common thread, the mutual acting tension is amplified and doubled through interference connection, elastic contact of the d1 surface and the d2 surface can be always kept in the process that the stress of the contact surfaces is continuously changed, the friction force of the two meshed contact surfaces d1 and d2 is increased along with the deformation of the elastic thread, and the friction resistance and the elastic deformation reaction force generated between the two meshed contact surfaces are jointly restrained to achieve strong looseness prevention.

Example 2:

as shown in fig. 1 and 5, the elastic thread angle a1 is smaller than the normal thread angle a1, the elastic thread angle a2 is larger than the normal thread angle a2, a1 < a2, and the matching thread pitches P are the same. When the elastic thread is screwed into the common thread, one side of the common thread is large in angle, the other side of the common thread is small in angle, the two sides of the elastic thread can be stretched along with the two sides of the common thread which is screwed into the common thread continuously, the contact surfaces d1 and d2 are stressed differently due to different angles, a state that the d1 on one side of the stress restrains the d2 on the other side is formed, elastic contact of the d1 and the d2 surfaces can be kept all the time even if the stress of the contact surfaces is changed continuously, the stress of the two meshed contact surfaces d1 and d2 is increased after the elastic thread is deformed, and the friction resistance and the elastic deformation reaction force which are generated mutually are restrained.

Example 3:

as shown in fig. 1, 6 and 7, the elastic thread angle a1 is smaller than the normal thread angle a1, the elastic thread angle a2 is smaller than the normal thread angle a2, a1 < a2, and the matching thread pitch P is different. When the elastic thread is screwed into the common thread, the angle of one side of the common thread is large, the angle of the other side of the common thread is small, the two sides of the elastic thread are expanded along with the continuous screwing of the two sides of the common thread, meanwhile, the stress of the contact surfaces d1 and d2 is increased by the accumulated and increased variable of the thread pitch difference, the stress generated by the different angles of the contact surfaces d1 and d2 is different, the state that the d2 on the other side is restrained by the d1 on the one side is formed, and the elastic contact of the d1 and d2 surfaces can be always kept even if the stress of the contact surfaces. The acting force accumulated and increased by the pitch difference and the acting force generated by the elastic thread deformation are continuously increased, the mutual generated frictional resistance is also continuously increased, and the acting force and the elastic deformation reaction force are jointly restrained to achieve super-strong anti-loosening.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the concept of the present invention, and these improvements and decorations should also be considered as the protection scope of the present invention.

Claims

1. An elastic thread anti-loose fastening device comprises a fastening thread body (1) and an elastic thread body (2); the fastening thread body (1) is provided with a common thread (3); the elastic thread body (2) is provided with an elastic thread (4), and the elastic thread (4) is connected with the common thread (3) in a matching way;

the method is characterized in that: the thread form angle of the elastic thread (4) is different from that of the common thread (3).

2. An elastic thread anti-loose fastening device as claimed in claim 1, wherein: the two side angles of the elastic thread (4) tooth form are different from those of the common thread (3).

3. An elastic thread anti-loose fastening device as claimed in claim 1, wherein: the elastic thread (4) is connected with the common thread (3) in an interference fit manner.

4. An elastic thread anti-loose fastening device as claimed in claim 1, wherein: the thread pitch of the elastic thread (4) is the same as that of the common thread (3).

5. An elastic thread anti-loose fastening device as claimed in claim 1, wherein: the thread pitch of the elastic thread (4) is different from that of the common thread (3).

6. An elastic thread anti-loose fastening device as claimed in claim 2, wherein: the tooth form angle of the elastic thread (4) is different from that of the common thread (3), and the difference range value is within +/-15 degrees.

7. An elastic thread anti-loose fastening device as claimed in claim 5, wherein: the difference range value of the thread pitches of the elastic thread (4) and the common thread (3) is within +/-0.5 mm.