Lock nut

Abstract

The utility model discloses a locknut. The locknut comprises a nut body, a distraction ring and an operation end. The nut body is provided with a through first inner screw hole, an annular groove is formed in the end face of the nut body around the first inner screw hole, and the first side face and the second side face of the groove are conical faces and are narrowed towards the bottom of the groove. The conicity of the first and second conical surfaces of the distraction ring is matched with the side surface of the annular groove, the nut body material is elastically deformed after insertion, and the aperture of the first inner screw hole is reduced to enhance the anti-loose friction force; the operation end is integrally formed at one end of the distraction ring, and the second inner screw hole and the first inner screw hole in the operation end are coaxially communicated and consistent in thread parameter. The anti-loosening nut is stable and reliable in anti-loosening effect, does not depend on easily-damaged auxiliary parts, is high in adaptability to severe environments and is suitable for various industrial scenes; mounting and dismounting are convenient, repeated use can be achieved, and use and maintenance cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of nut technology, specifically to an anti-loosening nut. Background Technology

[0002] Nuts are widely used as connecting and fastening parts in many fields such as machinery manufacturing and equipment assembly. Their connection reliability is directly related to the safety and stability of the entire system. With the continuous development of industrial technology, equipment operating conditions are becoming increasingly complex, and the requirements for the anti-loosening performance of nuts are also becoming higher and higher.

[0003] Currently, most common anti-loosening nuts on the market employ methods such as nylon ring anti-loosening, adding spring washers, and adhesive anti-loosening. Nylon ring anti-loosening is prone to aging and failure under high temperature and high vibration environments, leading to a decline in anti-loosening performance. Spring washer anti-loosening effectiveness relies on the washer's elasticity; after prolonged use, the elasticity weakens, resulting in poor anti-loosening performance. Adhesive anti-loosening adhesives have unstable curing and adhesion properties under different environments and are difficult to reuse after disassembly. These traditional anti-loosening nuts suffer from poor anti-loosening effect, limited applicability, and difficulty in reuse, failing to meet the stringent requirements for nut anti-loosening under complex working conditions. There is an urgent need to develop a new type of anti-loosening nut to improve its anti-loosening performance and applicability. Utility Model Content

[0004] In view of the shortcomings of the prior art, this utility model provides an anti-loosening nut.

[0005] The technical solution adopted in this utility model is: a lock nut, comprising:

[0006] A nut body having a through first internal threaded hole;

[0007] The end face of the nut body is provided with an annular groove surrounding the first internal thread hole;

[0008] The annular groove has a first side and a second side arranged opposite to each other. Both the first side and the second side are conical surfaces, and the size of the conical surfaces gradually narrows from the opening of the annular groove toward the bottom of the groove.

[0009] The expanding ring has a first conical surface and a second conical surface disposed opposite to each other, the taper of the first conical surface and the second conical surface being adapted to the taper of the first side surface and the second side surface of the annular groove;

[0010] When the spreading ring is inserted into the annular groove, the first conical surface and the second conical surface abut against the first side surface and the second side surface respectively, causing the nut body to undergo radial elastic contraction deformation, thereby causing the diameter of the first internal thread hole to be locally reduced to enhance the anti-loosening friction.

[0011] The operating end is integrally formed on one end of the spreading ring;

[0012] The operating end is provided with a second internal threaded hole that is coaxially connected to the first internal threaded hole, and the thread parameters of the second internal threaded hole are the same as those of the first internal threaded hole.

[0013] Furthermore, the central axis of the annular groove coincides with the central axis of the first internal threaded hole.

[0014] Furthermore, the outer contour of the operating end has a polygonal structure, which is used to cooperate with the wrench tool to apply rotational force.

[0015] Furthermore, the outer contour of the operating end is an equilateral hexagonal structure.

[0016] Furthermore, the contact surfaces of the nut body and the spreading ring are subjected to surface hardening treatment.

[0017] Furthermore, the taper of the first and second sides of the annular groove matches the taper of the first and second conical surfaces of the expanding ring, and the taper is in the range of 1:5 to 1:10.

[0018] The beneficial effects of this utility model are:

[0019] First, by setting an annular groove on the end face of the nut body, and the first and second sides of the annular groove being conical surfaces, and cooperating with a spreading ring with an appropriate taper, when the spreading ring is inserted into the annular groove, it causes the nut body material near the annular groove to undergo elastic deformation, causing the diameter of the first internal thread hole to be locally reduced, thereby greatly enhancing the anti-loosening friction. Compared with traditional anti-loosening nuts, its anti-loosening effect is more stable and reliable, effectively preventing the nut from loosening under complex working conditions and ensuring the safe operation of the equipment.

[0020] Secondly, the structural design of this anti-loosening nut does not rely on auxiliary components that are prone to aging and performance degradation (such as nylon rings, spring washers, glue, etc.), so it has stronger adaptability to harsh environments such as high temperature and high vibration, a wider range of applications, and can meet the needs of various industrial scenarios.

[0021] In addition, the operating end is integrally formed on one end of the expansion ring, and the second internal thread hole on the operating end has the same thread parameters as the first internal thread hole. This allows for the use of the same tools as conventional nuts during installation and disassembly, which is convenient and quick. At the same time, when reinstalling after disassembly, as long as the expansion ring is correctly reinserted into the annular groove, its anti-loosening function can be restored. It is highly reusable, reducing the cost of use and the difficulty of maintenance.

[0022] In addition to the objectives, features, and advantages described above, this utility model has other objectives, features, and advantages. The utility model will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of this utility model.

[0024] Figure 2 This is a cross-sectional schematic diagram of the present invention.

[0025] Figure 1-2 In the middle: 1. Nut body; 2. First internal threaded hole; 3. Annular groove; 4. First side; 5. Second side; 6. First conical surface; 7. Second conical surface; 8. Operating end; 9. Second internal threaded hole; 10. Spreading ring. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0028] This utility model provides an anti-loosening nut.

[0029] In this embodiment, refer to Figure 1-2 The lock nut includes:

[0030] Nut body 1, wherein the nut body 1 has a through first internal threaded hole 2;

[0031] The end face of the nut body 1 is provided with an annular groove 3 surrounding the first internal thread hole 2;

[0032] The annular groove 3 has a first side surface 4 and a second side surface 5 arranged opposite to each other. Both the first side surface and the second side surface are conical surfaces, and the size of the conical surfaces gradually narrows from the opening of the annular groove toward the bottom of the groove.

[0033] The expanding ring 10 has a first conical surface 6 and a second conical surface 7 disposed opposite to each other, and the taper of the first conical surface 6 and the second conical surface 7 is adapted to the taper of the first side surface and the second side surface of the annular groove.

[0034] When the spreading ring is inserted into the annular groove, the first conical surface and the second conical surface abut against the first side surface and the second side surface respectively, causing the nut body to undergo radial elastic contraction deformation, thereby causing the diameter of the first internal thread hole to be locally reduced to enhance the anti-loosening friction.

[0035] The operating end 8 is integrally formed on one end of the spreading ring;

[0036] The operating end is provided with a second internal threaded hole 9 that is coaxially connected to the first internal threaded hole, and the thread parameters of the second internal threaded hole are the same as those of the first internal threaded hole.

[0037] In the above technical solution, the annular groove of the nut body and the expansion ring are engaged by a conical surface. Utilizing the principle of a mechanical wedge structure, when the expansion ring is inserted into the annular groove, the conical surface of the expansion ring applies oblique pressure to the conical surface of the annular groove. The radial component of this pressure causes elastic deformation of the nut body material near the annular groove, resulting in a local reduction in the diameter of the first internal threaded hole. After the nut is tightened, the reduced hole diameter creates greater contact pressure and friction between the nut and the bolt, thereby achieving anti-loosening.

[0038] By enhancing friction through mechanical structural deformation, the anti-loosening method is stable and reliable, and does not rely on easily worn auxiliary components; the insertion depth of the spreading ring can be adjusted according to actual working conditions, and the magnitude of the anti-loosening friction can be flexibly controlled; compared with traditional anti-loosening nuts, it can adapt to more complex working conditions such as higher vibration and impact, significantly improving the nut's anti-loosening performance and connection stability.

[0039] In practical use, after connecting and tightening the nut body with the matching bolt, the expansion ring is screwed onto the bolt. At the same time, the expansion ring is inserted into the annular groove, causing the nut body material near the annular groove to undergo elastic deformation, which locally reduces the diameter of the first internal thread hole and achieves the anti-loosening effect.

[0040] Specifically, the central axis of the annular groove coincides with the central axis of the first internal threaded hole.

[0041] In this embodiment, the groove and the first internal threaded hole are concentrically arranged to ensure that when the nut is engaged with the bolt, the radial pressure generated by the annular groove and the spreading ring is evenly distributed around the bolt, ensuring that the reduction in the diameter of the first internal threaded hole is consistent in the circumferential direction, and avoiding local wear or misalignment of the nut and bolt due to uneven pressure.

[0042] Specifically, the outer contour of the operating end is polygonal, which is used to cooperate with the wrench tool to apply rotational force.

[0043] In this embodiment, the outer contour of the operating end is a polygonal structure, which conforms to the gripping and force application principle of a wrench. When the wrench is engaged with the polygonal operating end, by rotating the wrench, the polygonal structure evenly transmits the rotational force to the opening ring and the nut body, thereby realizing the tightening and loosening of the nut.

[0044] Specifically, the outer contour of the operating end is an equilateral hexagonal structure.

[0045] In this embodiment, the equilateral hexagonal structure is the most widely used and mechanically superior polygonal structure. Its six sides and six angles are equal, which allows the force to be evenly distributed on the six sides when applying force with a wrench, ensuring the smooth transmission of rotational force and avoiding damage to the operating end due to excessive local force.

[0046] Specifically, the contact surfaces of the nut body and the spreading ring are subjected to surface hardening treatment.

[0047] In this embodiment, the contact surfaces of the nut body and the expansion ring undergo surface hardening treatment. The surface hardness and wear resistance are improved through heat treatment, chemical treatment, etc., so that the contact surfaces can withstand greater pressure and friction during the extrusion and friction of the expansion ring, thereby reducing surface wear and plastic deformation.

[0048] Specifically, the taper of the first and second sides of the annular groove matches the taper of the first and second conical surfaces of the expanding ring, and the taper is in the range of 1:5 to 1:10.

[0049] In this embodiment, the taper of the annular groove and the spreading ring is in the range of 1:5 to 1:10. This taper range can ensure that when the spreading ring is inserted into the annular groove, it generates a sufficient radial force to deform the nut body material and enhance the anti-loosening friction, while avoiding the problem of the spreading ring being difficult to insert due to excessive taper or the anti-loosening effect being poor due to excessive taper.

[0050] Please note to all technical personnel: Although this utility model has been described according to the specific embodiments above, the concept of this utility model is not limited to this utility model. Any modification that utilizes the concept of this utility model will be included within the scope of protection of this patent right.

Claims

1. A lock nut, characterized in that include: Nut body, wherein the nut body has a through first internal threaded hole; The end face of the nut body is provided with an annular groove surrounding the first internal thread hole; The annular groove has a first side and a second side arranged opposite to each other. Both the first side and the second side are conical surfaces, and the size of the conical surfaces gradually narrows from the opening of the annular groove toward the bottom of the groove. The expanding ring has a first conical surface and a second conical surface disposed opposite to each other, the taper of the first conical surface and the second conical surface being adapted to the taper of the first side surface and the second side surface of the annular groove; When the spreading ring is inserted into the annular groove, the first conical surface and the second conical surface abut against the first side surface and the second side surface respectively, causing the nut body to undergo radial elastic contraction deformation, thereby causing the diameter of the first internal thread hole to be locally reduced to enhance the anti-loosening friction. The operating end is integrally formed on one end of the spreading ring; The operating end is provided with a second internal thread hole that is coaxially connected to the first internal thread hole, and the thread parameters of the second internal thread hole are the same as those of the first internal thread hole.

2. The lock nut of claim 1, wherein: The central axis of the annular groove coincides with the central axis of the first internal threaded hole.

3. The lock nut of claim 1, wherein: The outer contour of the operating end is polygonal, and it is used to cooperate with a wrench tool to apply rotational force.

4. The lock nut of claim 3, wherein: The outer contour of the operating end is an equilateral hexagonal structure.

5. The lock nut of claim 1, wherein: The contact surfaces between the nut body and the spreading ring are subjected to surface hardening treatment.

6. The lock nut of claim 1, wherein: The taper of the first and second sides of the annular groove matches the taper of the first and second conical surfaces of the expanding ring, and the taper is in the range of 1:5 to 1:10.

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