CN216742392U

CN216742392U - Anti-loose nut

Info

Publication number: CN216742392U
Application number: CN202220078208.5U
Authority: CN
Inventors: 李建明
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-01-12
Filing date: 2022-01-12
Publication date: 2022-06-14
Anticipated expiration: 2032-01-12

Abstract

The utility model discloses a locknut which is used for a connected piece and comprises a bolt, a washer and a nut body, wherein the bolt comprises a stud, the nut body comprises a first nut and a second nut, the first nut, the second nut and the washer are sequentially sleeved on the stud from outside to inside and are abutted against each other, and the washer is tightly attached to the connected piece; a groove with the bottom surface inclined to alpha is arranged on the end surface of the first nut, and the angle alpha is larger than the lead angle of the stud; the end face of the second nut is provided with a boss matched with the groove, the friction coefficient between the first nut and the second nut is f1, the friction coefficient between the second nut and the washer is f2, the friction coefficient between the washer and the connected piece is f3, and f1 is less than f2, and f1 is less than f 3. The anti-loosening nut utilizes the difference between the structure and the friction coefficient to enable the rotation angle of the first nut and the rotation angle of the second nut to be different, and a reliable anti-loosening effect is achieved. Meanwhile, the locknut has the advantages of simple structure and low cost, and is beneficial to popularization and use.

Description

Anti-loose nut

Technical Field

The utility model belongs to the technical field of locknuts, and particularly relates to a locknut.

Background

The locknut is a common fastening locknut, originates from abroad, and is permanently attached to threads by special engineering plastics, so that the engineering plastics are extruded to generate strong reaction force in the process of tightening the internal threads and the external threads, the friction force between the internal threads and the external threads is greatly increased, and the absolute resistance to vibration is provided.

In the prior art, the anti-loose nut can be divided into a plurality of types according to the anti-loose principle, and specifically, the anti-loose principle comprises mechanical anti-loose, rivet punch anti-loose, friction anti-loose, structural anti-loose and the like.

The mechanical anti-loosening is to use a stopping piece to directly limit the relative rotation of a locknut pair, such as a tooth-lifting pin, a serial steel wire, a stopping washer and the like. Since the locking element has no pretensioning force, the locking element is only effective when the union nut is released into the locking position, so that the union nut is practically not prevented from loosening but is prevented from falling off.

The riveting and punching anti-loosening are realized by adopting methods of punching, welding, bonding and the like after screwing, so that the locknut pair loses the characteristic of a kinematic pair and is connected into non-detachable connection. The disadvantage of this method is that the bolt can only be used once and is very difficult to disassemble, and the bolt pair must be destroyed to disassemble.

The friction anti-loosening is realized by adopting an elastic washer, a double nut, a self-locking nut, an insert locking nut and the like, a positive pressure which is not changed along with an external force is generated between the locking nut pairs, and a friction force which can prevent the locking nut pairs from rotating relatively is generated by the positive pressure.

The anti-loose structure is a structure applying a locknut pair, namely a down locknut anti-loose mode.

However, the locknut manufactured by the above-mentioned locking method has a limited service life and is easy to loosen.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a locknut with high quality and low price, which solves the problem that the existing locknut is easy to loosen.

In order to achieve the purpose, the utility model adopts the following technical scheme:

a locknut is used for a connected piece and comprises a bolt, a washer and a nut body, wherein the bolt comprises a stud penetrating through the connected piece, the nut body comprises a first nut and a second nut, the first nut, the second nut and the washer are sequentially sleeved on the stud from outside to inside and are abutted against the stud, and the washer is tightly attached to the connected piece;

the end face of the first nut is provided with at least two grooves, the bottom surfaces of the grooves are inclined, the inclination angle of the inclined plane is alpha, and the angle alpha is larger than the lead angle of the screw thread of the stud; the end face of the second nut is provided with at least two bosses which are matched with the grooves and are arranged in one-to-one correspondence with the grooves;

the friction coefficient between the first nut and the second nut is f1, the friction coefficient between the second nut and the washer is f2, the friction coefficient between the washer and the coupled member is f3, and f1 < f2, f1 < f 3.

In one possible design, a knurled layer capable of abutting against the washer is arranged on the end face, close to the washer, of the second nut;

the hardness of the washer is less than the respective hardness of the first nut and the second nut, and the surface of the washer is provided with a friction structure for increasing friction.

In one possible design, the bolt further comprises a nut fixed at one end of the stud, and the bottom surface of the nut can be tightly attached to the connected piece when the stud is arranged on the connected piece in a penetrating mode.

In one possible design, the stud, the nut, the first nut and the second nut are made of carbon steel, stainless steel or copper.

In one possible design, at least two grooves are uniformly distributed on the first nut by taking the axis of the first nut as the center; correspondingly, at least two bosses are uniformly distributed on the second nut by taking the axis of the second nut as the center.

In one possible design, a lubrication gap is left between the first nut and the second nut.

In one possible design, the second nut is provided with an oval shape.

Has the beneficial effects that:

the anti-loosening nut has the advantages that the structure is improved, the difference between the structure and the friction coefficient is utilized, the rotation angle difference between the first nut and the second nut is realized, the angle alpha is larger than the lead angle of the stud, the reliable anti-loosening effect is achieved, and the anti-loosening reliability is improved. Meanwhile, the locknut has the advantages of simple structure and low cost, and is favorable for popularization and use. In addition, the locknut can be used in industries such as high-speed rails, ships, bridges, ordinary and special vehicles, vibration machinery and the like, and has wide application range and good practicability.

Drawings

To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, and it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope.

Fig. 1 is a schematic structural view of a locknut.

In the figure:

1. a bolt; 11. a stud; 12. a nut; 2. a gasket; 3. a nut body; 31. a first nut; 32. a second nut; 301. a groove; 302. a boss; 303. lubricating the gap; 4. is connected with the piece.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some, but not all embodiments of the present invention.

Example (b):

as shown in fig. 1, the locknut is used for a coupled part 4, and comprises a bolt 1, a washer 2 and a nut body 3, wherein the bolt 1 comprises a stud 11 penetrating through the coupled part 4, the nut body 3 comprises a first nut 31 and a second nut 32, the first nut 31, the second nut 32 and the washer 2 are sequentially sleeved on the stud 11 from outside to inside and abutted against each other, and the washer 2 is tightly attached to the coupled part 4.

The end face of the first nut 31 is provided with at least two grooves 301, the bottom surfaces of the grooves 301 are inclined, the inclination angle of the inclined plane is alpha, and the angle alpha is larger than the lead angle of the screw thread of the stud 11; the end face of the second nut 32 is provided with at least two bosses 302 which are matched with the grooves 301, the bosses 302 are arranged corresponding to the grooves 301 one by one, the friction coefficient between the first nut 31 and the second nut 32 is f1, the friction coefficient between the second nut 32 and the washer 2 is f2, the friction coefficient between the washer and the connected piece is f3, and f1 is less than f2, and f1 is less than f 3.

Specifically, the structure of the nut body 3 is improved, and the nut body is divided into a first nut 31 and a second nut 32, the first nut 31 and the second nut 32 are respectively provided with a groove 301 and a boss 302 which are mutually matched, when the first nut 31 and the second nut 32 are mutually attached, the boss 302 is inserted into the groove 301, the bottom surface of the groove 301 is mutually attached to the top surface of the boss 302, and the end surface of the groove 301 is mutually abutted to the end surface of the boss 302. The mutual matching of the grooves 301 and the bosses 302 means that the structures of the grooves and the bosses are mutually matched on one hand, and the other hand means that the grooves and the bosses are in one-to-one correspondence in number.

For example, the groove 301 is located on the first nut 31, and the boss 302 is located on the second nut 32, so that when the nut body 3 is tightened, the end surface of the groove 301 and the end surface of the boss 302 are abutted to each other, so that the first nut 31 drives the second nut 32, and further the first nut 31, the second nut 32, the washer 2 and the coupled member 4 are sequentially abutted. Namely, the stud 11 is arranged on the connected piece 4 in a penetrating way, and one end of the stud 11 penetrates out of the connected piece 4; the worker sequentially sleeves the washer 2, the second nut 32 and the first nut 31 on the stud 11 and screws the washer 2, the second nut 32 and the first nut 31 by rotating the first nut 31, namely the first nut 31, the second nut 32, the washer 2 and the connected piece 4 are sequentially attached.

Conversely, when the nut body 3 is unscrewed, only the first nut 31 is screwed, and the inclined angle α of the bottom surface of the groove 301 is larger than the lead angle of the screw thread of the stud 11, when the second nut 32 keeps static, the first nut 31 also keeps static, namely, the self-locking of the screw thread is realized, and the purpose of preventing looseness is achieved.

Meanwhile, since there is the following relationship between the washer 2 and the second nut 32 and the coupled member 4:

firstly, the material of the washer 2 is different from that of the second nut and the coupled piece 4, and the friction coefficient of the material is large;

secondly, the surface of the gasket 2 is rough, and the friction coefficient is large;

thirdly, the washer 2 is made of a slightly softer material and can be forced into the gap between the coupling member 4 and the second nut 32 and the stud 11 during the tightening process, thereby greatly increasing the friction force.

Therefore, on the basis of the self-locking, the friction force is greatly improved, the loosening of the first nut 31 is effectively avoided, and the anti-loosening performance is greatly improved.

Furthermore, the washer 2 can be made of a material having as high a coefficient of friction as possible, ensuring that the washer 2 remains relatively stationary at all times after abutment with the coupled part 4.

Specifically, when the first nut 31 is unscrewed alone, a friction torque F1 is generated between the first nut 31 and the second nut 32; the second nut 32 tends to rotate under the action of the friction torque F1, so that a loosening torque F2 for loosening the second nut 32 is generated on the contact inclined plane between the groove 301 and the boss 302; meanwhile, the loosening torque F2 will cause the washer 2 to generate a friction torque F3 that prevents the second nut 32 from loosening, since the friction coefficient between the first nut 31 and the second nut 32 is F1, the friction coefficient between the second nut 32 and the washer 2 is F2, the friction coefficient between the washer and the coupled member is F3, and F1 < F2, F1 < F3, then F3 > F1+ F2.

If the looseness of the locknut occurs, the looseness of the first nut 31 is generally the looseness, because F3 is larger than F1+ F2, and the first nut 31 is self-locked on the stud 11 because the angle alpha is larger than the thread lead angle of the stud 11. When the nut body 3 is kept still, the first nut 31 cannot relatively rotate relative to the stud 11, and the self-locking of the first nut 31 is realized. If the second nut 32 is loosened, on one hand, the first nut 31 is self-locked on the stud 11 because the angle alpha is larger than the thread lead angle of the stud 11, and the first nut 31 will prevent the second nut 32 from loosening; on the other hand, a friction force is generated between the second nut 32 and the washer 2, and the washer 2 is fixed relative to the coupling member 4, and the friction force will also prevent the second nut 32 from loosening.

Therefore, when the nut body 3 is unscrewed, the first nut 31 and the second nut 32 are simultaneously screwed.

The anti-loosening nut has the advantages that the structure is improved, the difference between the structure and the friction coefficient is utilized, the rotation angles of the first nut 31 and the second nut 32 are differentiated, the angle alpha is larger than the lead angle of the stud, the reliable anti-loosening effect is achieved, and the anti-loosening reliability is improved. Meanwhile, the locknut has the advantages of simple structure and low cost, and is beneficial to popularization and use. In addition, the locknut can be used in industries such as high-speed rails, ships, bridges, ordinary and special vehicles, vibration machinery and the like, and has wide application range and good practicability.

The structure of the locknut is further explained as follows:

in a possible realization, the second nut 32 is provided, on its end face proximal to the washer 2, with a knurled layer able to abut against the washer 2. Based on the design, the knurling layer and the washer 2 are matched with each other in a concave-convex mode to achieve blocking, the knurling layer enables the contact surface of the second nut 32 and the washer 2 to be rougher, and friction coefficient between the second nut and the washer 2 is increased; in this way, the second nut 32 after being tightly attached is more difficult to separate from the washer 2, and the connection between the two is more stable and tight, which helps to prevent the first nut 31 and the second nut 32 from loosening respectively.

Alternatively, the washer has a hardness less than the hardness of each of the first and second nuts, i.e., the washer 2 material is slightly softer and will be forced into the gap between the coupling 4 and the second nut 32 and stud 11 during tightening, greatly increasing friction.

Optionally, the surface of the washer is provided with a friction structure for increasing friction. I.e. the friction coefficient is further increased by the friction structure. Friction structures include, but are not limited to: anti-slip lines, anti-slip points and anti-slip grooves.

In a possible implementation, referring to fig. 1, the bolt 1 further includes a nut 12 fixed at one end of the stud 11, and a bottom surface of the nut 12 can abut against the coupled member 4 when the stud 11 is inserted into the coupled member 4. Specifically, the structure of the bolt 1 is a conventional design in the art, and in the specific use process, a person skilled in the art can select any commercially available model with a suitable specification.

In a possible implementation, the stud 11, the nut 12, the first nut 31 and the second nut 32 are made of carbon steel, stainless steel or copper. The carbon steel mainly comprises low carbon steel, medium carbon steel, high carbon steel and alloy steel, and only the high carbon steel has low use frequency; the stainless steel mainly comprises austenitic stainless steel and martensitic stainless steel; copper is based on copper-zinc alloys, such as brass. It will be readily appreciated that the particular materials used will be selected by those skilled in the art according to the requirements of the application. Alternatively, one skilled in the art may select any other suitable material based on the above materials.

In a possible realization, at least two grooves 301 are uniformly distributed on the first nut 31, centered on the axis of the first nut 31; accordingly, at least two bosses 302 are evenly distributed on the second nut 32 centered on the axis of the second nut 32. It is known that the specific number of the grooves 301 and the bosses 302 can be adaptively increased or decreased according to the actual use condition, so as to achieve a better anti-loosening effect.

In one possible implementation, a lubrication gap 303 is left between the first nut 31 and the second nut 32. Based on the above design, any suitable lubricant is injected into the lubrication gap 303, so that the friction force between the first nut 31 and the second nut 32 is reduced, and the anti-loosening effect is improved. It is well known that any suitable commercially available lubricant may be selected.

Further, optionally, the second nut 32 is provided with an oval shape. Therefore, the second nut 32 cannot be unscrewed by a special tool, and the first nut 31 and the second nut 32 cannot be simultaneously screwed only by a common disassembling tool, such as a wrench, so that the locknut has an anti-theft function.

In a possible implementation, the second nut 32 may be provided in any other suitable shape to avoid the detachment of a common detaching tool, thereby achieving the purpose of theft prevention.

Finally, it should be noted that: the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A locknut is used for a connected piece (4) and is characterized by comprising a bolt (1), a washer (2) and a nut body (3), wherein the bolt (1) comprises a stud (11) penetrating through the connected piece (4), the nut body (3) comprises a first nut (31) and a second nut (32), the first nut (31), the second nut (32) and the washer (2) are sequentially sleeved on the stud (11) from outside to inside and abutted against each other, and the washer (2) is tightly attached to the connected piece (4);

the end face of the first nut (31) is provided with at least two grooves (301), the bottom surfaces of the grooves (301) are inclined, the inclination angle of the inclined plane is alpha, and the angle alpha is larger than the lead angle of the screw thread of the stud (11); bosses (302) matched with the grooves (301) are arranged on the end face of the second nut (32), and at least two bosses (302) are arranged and correspond to the grooves (301) one to one;

the coefficient of friction between the first nut (31) and the second nut (32) is f1, the coefficient of friction between the second nut (32) and the washer (2) is f2, the coefficient of friction between the washer and the coupled member is f3, and f1 < f2, f1 < f 3.

2. The locknut of claim 1, characterized in that the second nut (32) is provided with a knurled layer on the end face near the washer (2) that can abut against the washer (2);

3. The locknut according to claim 1, characterized in that the bolt (1) further comprises a nut (12) fixed at one end of the stud (11), and the bottom surface of the nut (12) can cling to the coupled piece (4) when the stud (11) is arranged on the coupled piece (4) in a penetrating way.

4. The locknut of claim 3, characterized in that the stud (11), the nut (12), the first nut (31) and the second nut (32) are made of carbon steel, stainless steel or copper.

5. The locknut of claim 1, characterized in that at least two grooves (301) are evenly distributed on the first nut (31) centered on the axis of the first nut (31); correspondingly, at least two bosses (302) are uniformly distributed on the second nut (32) by taking the axis of the second nut (32) as the center.

6. The locknut of claim 1, characterized in that a lubrication gap (303) is left between the first nut (31) and the second nut (32).

7. The locknut of claim 1 wherein the second nut (32) is provided with an oval shape.