Lock nut assembly

Abstract

The utility model relates to the technical field of fasteners, and discloses a locknut assembly which comprises a convex nut and a concave nut. The convex nut comprises a convex nut body and a boss coaxially arranged on the convex nut body, and threaded holes are formed in the convex nut body and the boss in a penetrating mode. The concave nut comprises a concave nut body and a concave hole which is coaxially formed in the concave nut body and matched with the boss. The concave nut body is further provided with a threaded hole penetrating through the concave nut body and the concave hole. The boss can be inserted into the concave hole under pressure; the threaded holes are matched with the bolts; the outer diameter of the boss is larger than the inner diameter of the concave hole. When the locknut assembly is used, the concave hole is arranged on the boss in a sleeved mode by screwing the concave nut, the boss is squeezed towards the middle through the concave hole, threads of the boss are more tightly attached to threads of a bolt, friction force of the boss is increased, and the nut is prevented from loosening. Meanwhile, the boss and the concave hole are coaxially arranged, eccentric pressure is not prone to being generated, the threads are evenly stressed, and therefore the service life of the screw is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of fasteners, in particular to a locking nut assembly. Background Art

[0002] Bolted connections, with their low cost and reliable connection performance, play an important role in mechanical equipment and are widely used. However, due to their important role and widespread application, loosening of bolted connections has become an inevitable problem. The resulting mechanical failures and safety hazards are common. Or, the fatigue life of bolted connections is greatly shortened due to loosening of bolts and reduced preload. Therefore, regular inspection and tightening by manual labor is required, which consumes a lot of manpower and material resources. Therefore, appropriate anti-loosening measures should be selected in the design to ensure that bolts do not loosen during actual use.

[0003] To improve the anti-loosening effect of existing nuts, some methods include using washers, self-locking nuts, and double nuts. Another method relies on the eccentric pressure of an eccentric male nut to lock a concentric female nut to prevent loosening. However, this design increases the manufacturing cost of the nut while achieving limited effectiveness. Furthermore, when eccentric pressure is applied to the concentric female nut and the eccentric male nut, the thread engagement between the nut and the bolt will inevitably shift to one side, resulting in uneven force on the threads and shortening the service life of the bolt and nut.

[0004] Therefore, there is an urgent need for a locking nut with better locking effect and longer service life to solve the problems in the prior art. Utility Model Content

[0005] The purpose of this utility model is to provide a locking nut assembly with better locking effect and longer service life, and the specific technical solution is as follows:

[0006] A locking nut assembly comprises a convex nut and a concave nut;

[0007] The convex nut comprises a convex nut body and a boss coaxially arranged on the convex nut body, and threaded holes are provided through the convex nut body and the boss;

[0008] The female nut comprises a female nut body and a concave hole coaxially arranged on the female nut body and matched with the boss, and the female nut body is further provided with a threaded hole penetrating the female nut body and the concave hole;

[0009] The boss can be inserted into the concave hole under pressure; the threaded hole is matched with the bolt.

[0010] Preferably, the material of the boss is a deformable material.

[0011] Preferably, the outer diameter of the boss is larger than the inner diameter of the recessed hole, so that the recessed hole presses the boss onto the bolt.

[0012] Preferably, the difference between the outer diameter of the boss and the inner diameter of the recessed hole ranges from 0.01 to 100 mm.

[0013] Preferably, the deformable material is a metal material.

[0014] Preferably, the metal material is steel.

[0015] Preferably, the outer circle of the boss facing one end of the recessed hole is provided with a chamfer; the inner circle of the recessed hole facing one end of the boss is provided with a chamfer.

[0016] Preferably, the overlapping range between the boss and the recessed hole includes at least one thread.

[0017] Preferably, the boss is a frustum; and / or the recess is a conical hole.

[0018] The application of the technical solution of the utility model has the following beneficial effects:

[0019] A locking nut assembly comprises a male nut and a female nut. The male nut comprises a male nut body and a boss coaxially disposed on the male nut body, wherein the male nut body and the boss have threaded holes extending therethrough. The female nut comprises a female nut body and a recessed hole coaxially disposed on the female nut body and matching the boss. The female nut body further comprises a threaded hole extending through the female nut body and the recessed hole. The boss can be inserted into the recessed hole under pressure, and the threaded hole matches a bolt. When the locking nut assembly of the utility model is in use, the recessed hole is fitted onto the boss by tightening the female nut. The recessed hole presses the boss toward the center, causing the boss's threads to more tightly mate with the bolt's threads, increasing friction and preventing the nut from loosening. After the recessed hole presses the boss toward the center, the boss exerts a reaction force on the recessed hole, making the female nut less likely to loosen. Furthermore, the coaxial boss and recessed hole prevent eccentric pressure from being generated, ensuring uniform force on the threads, thereby increasing the lifespan of the bolt.

[0020] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which constitute part of the present invention, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0022] Figure 1 Schematic diagram of the structure of the anti-loosening nut assembly in the embodiment of the present utility model;

[0023] Figure 2Three other structures of the anti-loosening nut assembly, among which: (a) is the fit between the frustum and the cylindrical hole; (b) is the fit between the frustum and the tapered hole; (c) is the fit between the cylinder and the cylindrical hole;

[0024] Figure 3 for Figure 2 A schematic diagram of a locknut assembly in use according to an embodiment of the present invention;

[0025] Wherein: 1. convex nut, 1.1. convex nut body, 1.2. boss; 2. concave nut, 2.1. concave nut body, 2.2. concave hole; 3. threaded hole; 4. bolt; 5. contact section. DETAILED DESCRIPTION

[0026] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0027] refer to Figure 1 A locking nut assembly includes a male nut 1 and a female nut 2; the male nut 1 includes a male nut body 1.1 and a boss 1.2 coaxially arranged on the male nut body 1.1, and a threaded hole 3 is provided through the male nut body 1.1 and the boss 1.2; the female nut 2 includes a female nut body 2.1 and a recessed hole 2.2 coaxially arranged on the female nut body 2.1 and matched with the boss 1.2, and the female nut body 2.1 is also provided with a threaded hole 3 that passes through the female nut body 2.1 and the recessed hole 2.2; the boss 1.2 can be inserted into the recessed hole 2.2 under pressure; and the threaded hole 3 is matched with a bolt. When the locking nut assembly of this embodiment is used, the recessed hole is set on the boss by tightening the female nut, and the recessed hole squeezes the boss toward the middle, so that the boss thread is more tightly fitted with the bolt thread, increasing the friction and preventing the nut from loosening. At the same time, the coaxial boss and recessed hole are not easy to generate eccentric pressure, so that the thread is evenly stressed, thereby improving its service life.

[0028] The boss 1.2 is made of a deformable material. The deformable material is a metal material, specifically steel. By providing the deformable material, preferably one with a certain elastic deformation capability, the boss and recess undergo a certain degree of deformation during assembly, thereby tightly fitting the boss to the bolt.

[0029] The outer circle of the boss 1.2 facing the recessed hole 2.2 is provided with a chamfer; the inner circle of the recessed hole 2.2 facing the boss 1.2 is provided with a chamfer. The outer diameter of the boss 1.2 is larger than the inner diameter of the recessed hole 2.2, so that the recessed hole 2.2 presses the boss 1.2 onto the bolt. The difference between the outer diameter of the boss 1.2 and the inner diameter of the recessed hole 2.2 ranges from 0.01 to 100 mm. With the above arrangement, the boss is inserted into the recessed hole through the chamfer and is squeezed by the recessed hole, so that the boss thread tightly engages with the bolt to prevent loosening.

[0030] The overlapping range of the boss 1.2 and the recessed hole 2.2 includes at least one thread. The overlapping range of at least one thread ensures sufficient squeezing force and friction force, thereby improving the anti-loosening effect of the nut assembly.

[0031] The boss 1.2 is a frustum; and / or the recess 2.2 is a tapered hole. That is, the boss can be any one of a frustum and a cylinder, and the recess can be any one of a cylindrical hole and a tapered hole. In this embodiment, it is preferred that the recess is a tapered hole and the boss is a cylinder, see Figure 1 In addition, bosses and recesses can also be combined in other forms, such as Figure 2 As shown: (a) is the fit between the frustum and the cylindrical hole, (b) is the fit between the frustum and the tapered hole, and (c) is the fit between the cylinder and the cylindrical hole.

[0032] refer to Figure 3 , a schematic diagram of the above embodiment in use, shows the male nut 1 being pressed against the bolt 4 by the female nut 2. The height of the contact section 5 where the male nut 1 and the bolt 4 meet is determined based on actual conditions. At the contact section 5, the internal threads of the male nut 1 and the external threads of the bolt 4 fit perfectly and tightly together, leaving no gaps.

[0033] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention can be modified and varied in various ways within the spirit and principles of the present invention.

Claims

1. A locking nut assembly, characterized in that: It comprises a convex nut (1) and a concave nut (2); The convex nut (1) comprises a convex nut body (1.1) and a boss (1.2) coaxially arranged on the convex nut body (1.1), and threaded holes (3) are provided through the convex nut body (1.1) and the boss (1.2); The female nut (2) comprises a female nut body (2.1) and a concave hole (2.2) coaxially arranged on the female nut body (2.1) and matched with the boss (1.2); the female nut body (2.1) is further provided with a threaded hole (3) penetrating the female nut body (2.1) and the concave hole (2.2); The boss (1.2) can be inserted into the recessed hole (2.2) under pressure; and the threaded hole (3) is matched with the bolt.

2. The anti-loosening nut assembly according to claim 1, characterized in that: The material of the boss (1.2) is a deformable material.

3. The anti-loosening nut assembly according to claim 2, characterized in that: The outer diameter of the boss (1.2) is greater than the inner diameter of the recessed hole (2.2), so that the recessed hole (2.2) presses the boss (1.2) onto the bolt.

4. The anti-loosening nut assembly according to claim 3, characterized in that: The difference between the outer diameter of the boss (1.2) and the inner diameter of the recessed hole (2.2) ranges from 0.01 to 100 mm.

5. The lock nut assembly according to claim 2, wherein: The deformable material is a metal material.

6. The lock nut assembly according to claim 5, characterized in that: The metal material is steel.

7. The lock nut assembly according to claim 1, wherein: The outer circle of the boss (1.2) facing one end of the recessed hole (2.2) is provided with a chamfer; the inner circle of the recessed hole (2.2) facing one end of the boss (1.2) is provided with a chamfer.

8. The lock nut assembly according to claim 1, wherein: The overlapping range between the boss (1.2) and the recessed hole (2.2) includes at least one thread.

9. The lock nut assembly according to claim 1, wherein: The boss (1.2) is a frustum; and / or the recessed hole (2.2) is a conical hole.

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