Anti-loose fastener with elastic locking structure

Abstract

The utility model discloses a kind of anti-loose fasteners with elastic locking structure, including main nut and locking ring, the inside of main nut is equipped with conical hole, the inner wall of conical hole is equipped with first internal thread, the outside of locking ring is equipped with the taper surface matched with conical hole, taper surface is equipped with the external thread thread link with first internal thread, the inner wall of locking ring is equipped with the second internal thread matched with the bolt matched with it.The utility model realizes the radial and axial double locking of bolt, improves the anti-loose performance;The circumferential groove of locking ring small diameter end enhances the elastic deformation ability of locking ring, so that locking ring can better adapt to bolt and keep sustained compression, locking extension ring is located at the small diameter end of main nut, the inner diameter of locking extension ring is less than or equal to the inner diameter of locking ring at circumferential groove, further limit the radial expansion of locking ring, enhance locking effect, realize bidirectional locking, anti-loose performance is excellent, also have the characteristics of simple structure and easy to install.

Description

Technical Field

[0001] This utility model relates to the field of fastener technology, and in particular to an anti-loosening fastener with an elastic locking structure. Background Technology

[0002] In fields such as machinery, vehicles, aerospace, and bridge construction, bolted connections are a common method of connection, and their anti-loosening performance directly affects the safety and reliability of the equipment. Traditional anti-loosening methods, such as double nuts, spring washers, and cotter pins, while effective to some extent, may still loosen or even fall off under long-term vibration, impact, or large temperature variations, leading to connection failure. Existing technologies also include some elastic lock nuts, but their complex structure, inconvenient installation, or reliance on non-metallic inserts make them prone to aging and failure in high-temperature and highly corrosive environments, and they have poor reusability. Utility Model Content

[0003] To overcome the technical defects of the existing technology, this utility model provides an anti-loosening fastener with an elastic locking structure.

[0004] The technical solution adopted by this utility model is: an anti-loosening fastener with an elastic locking structure, including a main nut and a locking ring. The main nut has a tapered hole inside, and the inner wall of the tapered hole has a first internal thread. The outer side of the locking ring is a tapered surface that mates with the tapered hole. The tapered surface has an external thread that is threadedly connected to the first internal thread. The inner side wall of the locking ring has a second internal thread that mates with the bolt it is mating with. The small diameter end of the locking ring has at least two axially extending circumferential grooves. The end of the main nut near the small diameter of the tapered hole has a locking extension ring that matches the bolt it is mating with. The inner diameter of the locking extension ring is less than or equal to the inner diameter of the locking ring at the circumferential groove.

[0005] Preferably, at least two of the circumferential grooves are evenly distributed circumferentially at the ends of the locking ring, and the depth of the circumferential grooves is greater than half the wall thickness of the locking ring.

[0006] Preferably, the inner wall of the circumferential groove is provided with reinforcing ribs, and the thickness of the reinforcing ribs is less than the wall thickness of the locking ring.

[0007] Preferably, the inner wall of the locking extension ring is provided with a third internal thread, and the pitch of the third internal thread is the same as that of the second internal thread.

[0008] Preferably, the outer periphery of the main nut is provided with a polygonal turning part, and the outer end wall of the locking ring is provided with a tool mating groove.

[0009] Preferably, the taper of the conical hole is consistent with the taper of the conical surface, and the taper angle ranges from 5° to 15°.

[0010] Preferably, the main nut and the locking extension ring are integrally formed.

[0011] Preferably, the locking ring is made of an elastic material, and there is a gap between the end of the locking ring near the circumferential groove and the inner end face of the main nut.

[0012] Preferably, the first internal thread and the external thread are matching triangular threads or trapezoidal threads.

[0013] Preferably, the end face of the main nut is provided with anti-slip texture or knurling.

[0014] The beneficial effects of this utility model are: The tapered hole inside the main nut mates with the tapered surface on the outside of the locking ring. The tapered hole and the tapered surface are connected by threads. When the main nut and the locking ring rotate relative to each other, the locking ring moves axially along the tapered hole and is radially contracted by the pressure of the tapered surface. This causes the second internal thread on the inner side of the locking ring to generate radial clamping force with the bolt, achieving dual radial and axial locking of the bolt and improving the anti-loosening performance. The circumferential groove at the small diameter end of the locking ring enhances the elastic deformation capacity of the locking ring, allowing the locking ring to better adapt to the bolt and maintain continuous clamping. The locking extension ring is located at the small diameter end of the main nut. The inner diameter of the locking extension ring is less than or equal to the inner diameter of the locking ring at the circumferential groove, further limiting the radial expansion of the locking ring and enhancing the locking effect. It achieves bidirectional locking, excellent anti-loosening performance, and also features simple structure and convenient installation. Attached Figure Description

[0015] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0016] Figure 1 This is a schematic diagram of the anti-loosening fastener with an elastic locking structure according to the present invention; Figure 2 This is a cross-sectional view of the anti-loosening fastener with an elastic locking structure according to the present invention; Figure 3 This is a schematic diagram of the locking ring of this utility model; Figure 4 This is a cross-sectional view of the locking ring of this utility model; Figure 5 This is a cross-sectional view of the structure of the connection between the main nut and the locking extension ring of this utility model.

[0017] Explanation of reference numerals in the attached figures: 1. Main nut; 2. Locking ring; 3. Tapered hole; 4. First internal thread; 5. Tapered surface; 6. External thread; 7. Second internal thread; 8. Circumferential groove; 9. Locking extension ring; 10. Reinforcing rib; 11. Third internal thread; 12. Polygonal turning part; 13. Tool mating groove. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this utility model clearer, the various embodiments of this utility model will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been provided in the various embodiments of this utility model to facilitate a better understanding of this application. However, the technical solutions claimed in the claims of this application can be implemented even without these technical details and with various variations and modifications based on the following embodiments.

[0019] like Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, this embodiment provides an anti-loosening fastener with an elastic locking structure, including a main nut 1 and a locking ring 2. The main nut 1 has a conical hole 3 inside, and the inner wall of the conical hole 3 has a first internal thread 4. The outer side of the locking ring 2 is provided with a conical surface 5 that mates with the conical hole 3. The conical surface 5 has an external thread 6 that is threadedly connected to the first internal thread 4. The inner side wall of the locking ring 2 has a second internal thread 7 that mates with the mating bolt. The small-diameter end of the locking ring 2 has at least two axially extending circumferential grooves 8. The main nut 1 has a locking extension ring 9 that matches the mating bolt at one end near the small diameter of the conical hole 3. The inner diameter of the locking extension ring 9 is less than or equal to the inner diameter of the locking ring 2 at the circumferential grooves 8. The conical hole 3 inside the main nut 1 and the locking ring 2 are connected by a locking ring 6. The outer conical surface 5 of the locking ring 2 is engaged with the conical hole 3 and the conical surface 5 are connected by threads. When the main nut 1 and the locking ring 2 rotate relative to each other, the locking ring 2 moves axially along the conical hole 3 and is squeezed by the conical surface 5 to generate radial contraction, thereby generating radial clamping force between the second internal thread 7 on the inner side of the locking ring 2 and the bolt, thus achieving anti-loosening. The circumferential groove 8 opened at the small diameter end of the locking ring 2 enhances the elastic deformation capacity of the locking ring 2, so that the locking ring 2 can better adapt to the bolt and maintain continuous clamping. The locking extension ring 9 is located at the small diameter end of the main nut 1. The inner diameter of the locking extension ring 9 is less than or equal to the inner diameter of the locking ring 2 at the circumferential groove 8, which further restricts the radial expansion of the locking ring 2, enhances the locking effect, realizes bidirectional locking, has excellent anti-loosening performance, and also has the characteristics of simple structure and convenient installation.

[0020] At least two of the circumferential grooves 8 are evenly distributed circumferentially at the ends of the locking ring 2, and the depth of the circumferential grooves 8 is greater than half the wall thickness of the locking ring 2, so that the locking ring 2 deforms more evenly when under pressure, avoids local stress concentration, and improves the stability and service life of locking.

[0021] The inner wall of the circumferential groove 8 is provided with reinforcing ribs 10. The thickness of the reinforcing ribs 10 is less than the wall thickness of the locking ring 2. This can enhance the structural strength of the circumferential groove 8 without significantly reducing the elastic deformation capacity, and prevent cracking or plastic deformation.

[0022] The inner wall of the locking extension ring 9 is provided with a third internal thread 11. The pitch of the third internal thread 11 is the same as that of the second internal thread 7. The third internal thread 11 can form an auxiliary thread connection with the bolt, further preventing the bolt from retracting and improving the reliability of the anti-loosening mechanism.

[0023] The outer periphery of the main nut 1 is provided with a polygonal turning part 12, which is convenient for conventional tool operation. The outer end wall of the locking ring 2 is provided with a tool mating groove 13, which is convenient for independent adjustment of the pre-tightening state of the locking ring 2 and to achieve fine adjustment.

[0024] The taper of the tapered hole 3 is consistent with the taper of the tapered surface 5, and the taper angle ranges from 5° to 15°. This ensures sufficient radial shrinkage while avoiding assembly difficulties or stress concentration due to excessive taper angle, thus balancing assemblability and locking effect.

[0025] The main nut 1 and the locking extension ring 9 are integrally formed, which improves the overall structure, strength and sealing performance, reduces assembly steps and lowers the failure rate.

[0026] The locking ring 2 is made of elastic material. There is a gap between the end of the locking ring 2 near the circumferential groove 8 and the inner end face of the main nut 1 to ensure that the locking ring 2 can deform freely when under pressure, so as to avoid insufficient locking force or bolt damage due to excessive material rigidity.

[0027] The first internal thread 4 and the external thread 6 are mutually matched triangular threads or trapezoidal threads. Triangular threads are suitable for general working conditions, while trapezoidal threads are suitable for heavy-load and high-vibration occasions, which improves the thread load-bearing capacity and anti-loosening performance.

[0028] The end face of the main nut 1 is provided with anti-slip texture or knurling, which facilitates manual tightening or operation in narrow spaces and improves assembly convenience.

[0029] During operation, the tapered hole 3 inside the main nut 1 mates with the tapered surface 5 on the outer side of the locking ring 2. The tapered hole 3 and the tapered surface 5 are connected by threads. When the main nut 1 and the locking ring 2 rotate relative to each other, the locking ring 2 moves axially along the tapered hole 3 and is squeezed by the tapered surface 5 to generate radial contraction. This causes the second internal thread 7 on the inner side of the locking ring 2 to generate radial clamping force with the bolt, thus preventing loosening. The circumferential groove 8 opened at the small diameter end of the locking ring 2 enhances the elastic deformation capacity of the locking ring 2, allowing the locking ring 2 to better adapt to the bolt and maintain continuous clamping. The locking extension ring 9 is located at the small diameter end of the main nut 1. The inner diameter of the locking extension ring 9 is less than or equal to the inner diameter of the locking ring 2 at the circumferential groove 8, further limiting the radial expansion of the locking ring 2, enhancing the locking effect, achieving bidirectional locking, excellent anti-loosening performance, and also featuring simple structure and convenient installation.

[0030] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0031] Those skilled in the art will understand that the above embodiments are specific examples of implementing the present invention, and in practical applications, various changes can be made to them in form and detail without departing from the spirit and scope of the present invention.

Claims

1. A fastener with an elastic locking structure to prevent loosening, characterized in that: The device includes a main nut (1) and a locking ring (2). The main nut (1) has a tapered hole (3) inside, and the inner wall of the tapered hole (3) has a first internal thread (4). The outer side of the locking ring (2) is a tapered surface (5) that mates with the tapered hole (3). The tapered surface (5) has an external thread (6) that is threadedly connected to the first internal thread (4). The inner side wall of the locking ring (2) has a second internal thread (7) that mates with the bolt. The small diameter end of the locking ring (2) has at least two axially extending circumferential grooves (8). The main nut (1) has a locking extension ring (9) that matches the bolt at one end near the small diameter of the tapered hole (3). The inner diameter of the locking extension ring (9) is less than or equal to the inner diameter of the locking ring (2) at the circumferential groove (8).

2. The anti-loosening fastener with an elastic locking structure according to claim 1, characterized in that: At least two of the circumferential grooves (8) are evenly distributed circumferentially at the ends of the locking ring (2), and the depth of the circumferential grooves (8) is greater than half the wall thickness of the locking ring (2).

3. The anti-loosening fastener with an elastic locking structure according to claim 1, characterized in that: The inner wall of the circumferential groove (8) is provided with reinforcing ribs (10), and the thickness of the reinforcing ribs (10) is less than the wall thickness of the locking ring (2).

4. The anti-loosening fastener with an elastic locking structure according to claim 1, characterized in that: The inner wall of the locking extension ring (9) is provided with a third internal thread (11), and the pitch of the third internal thread (11) is the same as that of the second internal thread (7).

5. The anti-loosening fastener with an elastic locking structure according to claim 1, characterized in that: The outer periphery of the main nut (1) is provided with a polygonal twisting part (12), and the outer end wall of the locking ring (2) is provided with a tool mating groove (13).

6. The anti-loosening fastener with an elastic locking structure according to claim 1, characterized in that: The taper of the conical hole (3) is consistent with the taper of the conical surface (5), and the taper angle ranges from 5° to 15°.

7. The anti-loosening fastener with an elastic locking structure according to claim 1, characterized in that: The main nut (1) and the locking extension ring (9) are integrally formed.

8. A fastener with an elastic locking structure according to claim 1, characterized in that: The locking ring (2) is made of elastic material, and there is a gap between the end of the locking ring (2) near the circumferential groove (8) and the inner end face of the main nut (1).

9. A fastener with an elastic locking structure according to claim 1, characterized in that: The first internal thread (4) and the external thread (6) are matching triangular threads or trapezoidal threads.

10. A fastener with an elastic locking structure according to claim 1, characterized in that: The end face of the main nut (1) is provided with anti-slip texture or knurling.

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