CN210565657U

CN210565657U - Anti-loose fastening device for nut

Info

Publication number: CN210565657U
Application number: CN201921504767.2U
Authority: CN
Inventors: 李武彬
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-09-09
Filing date: 2019-09-09
Publication date: 2020-05-19
Anticipated expiration: 2029-09-09

Abstract

The utility model discloses a locking fastener of helicla flute, including bolt, main nut, deputy nut all through hole threaded connection in the bolt, deputy nut connects in the outer spiral groove of main nut through the hole helicla flute, the utility model discloses utilize and connect helicla flute increase main and deputy nut hole screw thread and bolt external screw thread meshing face frictional force for device threaded connection department produces the huge frictional resistance even, is covered with whole meshing periphery, guarantees that each link is not hard up under various adverse work environment such as frequent vibration and load change, plays real locking effect of moving. 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

Anti-loose fastening device for nut

Technical Field

The utility model relates to the technical field of machining, especially, relate to a locking fastener of helicla flute.

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 spring washer, a double 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 and spring pressing type anti-loosening, cannot be widely applied due to complex manufacturing and high cost, and can not radically solve the problems and have potential safety hazards due to the phenomena of fracture and damage of the main body under the condition of large torsion.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the technical problem who solves has overcome prior art's not enough, provides a locking fastener of nut, in order to solve above-mentioned technical problem, the utility model discloses a technical scheme as follows: comprises a bolt, a main nut and an auxiliary nut; the inner holes of the main nut and the auxiliary nut are provided with threads matched with the outer sides of the bolts; and a fastening device fixedly connected with each other is arranged between the main nut and the auxiliary nut.

Further, the fastening device is a spiral groove between the main nut and the auxiliary nut.

Further, the pitch of the spiral curve of the spiral groove is not equal to the pitch of the thread.

Further, the pitch of the spiral curve of the spiral groove is larger than the pitch of the thread.

Further, the cross-sectional shape of the spiral groove is trapezoidal.

Furthermore, the included angle of the trapezoid is 40-70 degrees.

Further, the height of the trapezoid is 0.45mm-1.25 mm.

Furthermore, the spiral curve space between the spiral groove on the main nut and the spiral groove on the auxiliary nut is not equal.

The utility model has the advantages as follows:

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

2. the thin-wall nut can not be connected by using threads;

3. different friction forces can be generated under the same axial tension, and the purpose that the auxiliary nut is not loosened is achieved;

4. can be repeatedly used without difference for unlimited times; 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 the structure diagram of the main nut of the present invention

FIG. 3 is a view of the structure of the auxiliary nut of the present invention

FIG. 4 is the spiral groove thread curve chart of the present invention

FIG. 5 is a graph showing the dimension of the spiral groove of the present invention

Reference numbers in the figures: 1-a bolt; 2-main nut; 3-auxiliary nut; 4-threading; 5-helical groove, 6-helical curve pitch.

Detailed Description

To facilitate understanding and implementing the present invention by those of ordinary skill in the art, the present invention will be described in further detail with reference to the accompanying drawings and detailed description.

As shown in fig. 1, 2 and 3, the device is a spiral groove anti-loose fastening device. The bolt comprises a bolt 1, a main nut 2 and an auxiliary nut 3, wherein a main nut internal thread 4 and an auxiliary nut internal thread 4 are uniformly connected to a bolt external thread 4; the spiral groove 5 of the main nut is matched and connected with the spiral groove 5 of the auxiliary nut.

As shown in fig. 4, the spiral curve interval 6 of the spiral groove 5 is greater than the thread 4 interval, the main nut 2 and the auxiliary nut 3 keep a certain clearance and are synchronous with the bolt 1 at the same time, the two nuts are rotated at the same time, after the thread 4 of the main nut 2 is fastened (kept), the auxiliary nut 3 is rotated through the rotation of the auxiliary nut 3, the difference between the thread 4 pitch in the auxiliary nut 3 and the thread 5 interval of the spiral groove is utilized, the friction force between the connecting thread 4 and the external thread meshing surface of the connecting bolt is increased, meanwhile, the rotation torque force of the auxiliary nut 3 is converted into the axial tension force through the spiral locking groove, so that the friction force between the connecting thread 4 and the external thread meshing surface of the connecting bolt is continuously superposed and enhanced, and the friction force.

As shown in figure 5, the section of the spiral groove 5 of the anti-loosening fastening device for the spiral groove is trapezoidal, the included angle of the standard trapezoidal spiral groove 5 is 40-70 degrees, the height of the trapezoid is 0.45-1.25 mm, and the wall thickness of the minimum connecting part between the inner thread and the outer thread of a standard nut is smaller than 0.6mm, so that the main nut 2 is broken and cannot be used.

Or, in another method, the distance between the spiral grooves 5 on the main nut 2 and the auxiliary nut 3 is not equal, and the friction force between the main nut 2 and the auxiliary nut 3 is increased by utilizing the difference between the distances between the spiral grooves 5 on the main nut 2 and the auxiliary nut 3, so that the friction force between the main nut 2 and the auxiliary nut 3 is continuously superposed and enhanced, and the friction resistance and the axial acting force generated between the main nut 2 and the auxiliary nut 3 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. A nut anti-loose fastening device comprises a bolt (1), a main nut (2) and an auxiliary nut (3); the inner holes of the main nut and the auxiliary nut are provided with threads (4) matched with the outer sides of the bolts;

the method is characterized in that: and a fastening device fixedly connected with each other is arranged between the main nut and the auxiliary nut.

2. The nut anti-loose fastening device according to claim 1, characterized in that: the fastening device is a spiral groove (5) between the main nut (2) and the auxiliary nut (3).

3. The nut anti-loose fastening device according to claim 2, characterized in that: the spiral curve space (6) of the spiral groove (5) is not equal to the space of the thread (4).

4. A nut anti-loosening fastening device as claimed in claim 3, wherein: the spiral curve space (6) of the spiral groove (5) is larger than the space of the thread (4).

5. A nut anti-loose fastening device according to claim 2 or 3, characterized in that: the section of the spiral groove (5) is trapezoidal.

6. The nut anti-loose fastening device according to claim 5, characterized in that: the included angle of the trapezoid is 40-70 degrees.

7. The nut anti-loose fastening device according to claim 6, characterized in that: the height of the trapezoid is 0.45mm-1.25 mm.

8. The nut anti-loose fastening device according to claim 2, characterized in that: the spiral curve space (6) between the spiral groove (5) on the main nut (2) and the spiral groove (5) on the auxiliary nut (3) is not equal.