Locking nut

Abstract

The present invention relates to an anti-loosening nut, comprising a nut body including a bolt fastening hole through which a bolt is fastened, and a ring-shaped anti-loosening member inserted and fixed within the bolt fastening hole and preventing loosening by being in close contact with the bolt passing through the bolt fastening hole. The bolt fastening hole includes a screw fastening area having screw threads formed on its inner circumference and a member insertion area having an inner diameter larger than that of the screw fastening area and extending along an axial direction in which the bolt is inserted. The anti-loosening member includes a first fastening reinforcing layer, a cushioning layer, and a second fastening reinforcing layer that are sequentially stacked along the axial direction from the direction in which the bolt is inserted.

Description

Technology Field

[0001] The present invention relates to an anti-loosening nut, and more specifically, to an anti-loosening nut comprising an anti-loosening member configured to maintain a stable fastening force even during repeated fastening and unfastening. Background Technology

[0002] Bolts and nuts are the most commonly used mechanical elements because they enable precise and easy assembly and fastening of components such as mechanical devices. However, a slight gap inevitably exists between the threads of a bolt and a nut to facilitate mutual fastening. Consequently, the bolt and nut can momentarily loosen due to vibrations or impacts occurring in the components. As a result, the fastening state of the bolt and nut is not satisfactory, leading to a problem where the assembly and fastening of mechanical devices cannot be securely performed.

[0003] FIG. 1 is a drawing showing a nylon nut according to the prior art. Referring to FIG. 1, in order to solve the above-mentioned problem, a nylon ring (30) without threads was inserted into the inner side of the nut, and the upper part of the nut covered the nylon ring (30) by press processing to fix the nylon ring (30). As the bolt and the nylon nut (10) were fastened, threads were formed on the nylon ring (30) without any gap, thereby preventing loosening.

[0004] However, a problem arose in which the nylon nut (10) had to be replaced with a new nylon nut (10) as the fastening force decreased due to deformation, wear, etc. of the nylon ring (30) during the repeated fastening and unfastening process. The problem to be solved

[0005] The technical problem to be solved by the present invention is to provide an anti-loosening nut capable of not only securing high fastening force but also maintaining the fastening force even in a repeated fastening environment, thereby providing long-term fastening stability.

[0006] The problems that the present invention aims to solve are not limited to those mentioned above, and other unmentioned problems will be clearly understood by those skilled in the art from the description below. means of solving the problem

[0007] An anti-loosening nut according to one embodiment of the present invention comprises a nut body including a bolt fastening hole through which a bolt is fastened; and includes a ring-shaped anti-loosening member that is inserted and fixed within the bolt fastening hole and prevents loosening by being in close contact with a bolt penetrating the bolt fastening hole, wherein the bolt fastening hole includes a screw fastening area having screw threads formed on its inner surface and a member insertion area having an inner diameter larger than that of the screw fastening area and extending along the axial direction in which the bolt is inserted, and the anti-loosening member includes a first fastening reinforcement layer, a buffer layer, and a second fastening reinforcement layer that are sequentially stacked along the axial direction from the direction in which the bolt is inserted, wherein the first fastening reinforcement layer includes a first bottom portion having a ring shape that contacts the bottom surface of the member insertion area and a first side wall portion that contacts the inner surface of the member insertion area and extends along the axial direction from the edge of the first bottom portion, and the second fastening reinforcement layer has a ring shape with an outer diameter smaller than that of the first bottom portion and is disposed on the first bottom portion with the buffer layer in between, and includes a plurality of slits formed by its inner surface being indented outward, and on its inner surface thereare grooves that are alternately repeated along the axial direction and Protrusions are formed, and a pressure rod is inserted and fixed inside the slit and protrudes into the groove between adjacent protrusions, and the buffer layer is interposed between the first fastening reinforcement layer and the second fastening reinforcement layer, and may include a second bottom portion having a ring shape disposed on the first bottom portion and a second side wall portion extending from the edge of the second bottom portion along the axial direction between the first side wall portion and the outer wall of the second fastening reinforcement layer.

[0008] According to one embodiment, each of the first fastening reinforcing layer and the second fastening reinforcing layer comprises a polyamide resin and a glass fiber, wherein the ratio of the glass fiber to the polyamide resin of the second fastening reinforcing layer may be higher than the ratio of the glass fiber to the polyamide resin of the first fastening reinforcing layer.

[0009] According to one embodiment, the first fastening reinforcing layer may be formed using a first fastening reinforcing composition comprising 73 to 83 weight% of polyamide resin, 15 to 25 weight% of glass fiber, and 2 to 5 weight% of a first additive comprising at least one of an antioxidant, a slip agent, an antifouling agent, a release agent, and a flame retardant, and the second fastening reinforcing layer may be formed using a second fastening reinforcing composition comprising 55 to 63 weight% of polyamide resin, 30 to 40 weight% of glass fiber, and 2 to 5 weight% of a second additive comprising at least one of an antioxidant, a slip agent, an antifouling agent, a release agent, and a flame retardant.

[0010] According to one embodiment, the buffer layer may be formed using a buffer composition comprising a resin mixture including a thermoplastic polyurethane elastomer (TPU) and a silicone resin, polytetrafluoroethylene (PTFE) microparticles, a water-soluble polymer resin, a natural extract mixture including rosemary extract, sage extract and persimmon leaf extract, and an oil mixture including grapeseed oil, clove oil and eucalyptus oil.

[0011] According to one embodiment, the buffer composition may be prepared to include 85 to 95 weight% of a resin mixture in which a thermoplastic polyurethane elastomer and a silicone resin are mixed in a weight ratio of 1:0.1 to 0.3, 1 to 3 weight% of polytetrafluoroethylene (PTFE) microparticles, 0.5 to 2 weight% of a water-soluble polymer resin including a water-soluble acrylic resin or a water-soluble epoxy resin, 0.5 to 2 weight% of a natural extract mixture in which rosemary extract, sage extract, and persimmon leaf extract are mixed in a weight ratio of 1:0.5 to 1:0.5 to 1, and 0.2 to 1 weight% of an oil mixture in which grapeseed oil, clove oil, and eucalyptus oil are mixed in a weight ratio of 1:0.1 to 0.3:0.1 to 0.3.

[0012] According to one embodiment, the pressure rod is formed with a rounded curved end and may be made of thermoplastic polyurethane (TPU) or polyacetal (POM) material. Effects of the invention

[0013] An anti-loosening nut including an anti-loosening member according to embodiments of the present invention can not only secure high fastening force during initial fastening but also effectively prevent wear and reduction of fastening force due to repeated fastening and unfastening of the bolt. In particular, the cushioning layer of the anti-loosening member alleviates the compressive load generated during fastening and suppresses deformation of the fastening part, thereby providing long-term fastening stability, and the second fastening reinforcing layer (160) can provide wear resistance and resilience to maintain fastening force even in a repeated fastening environment.

[0014] As a result, the anti-loosening nut of the present invention has significantly improved durability and fastening reliability, and can exhibit an excellent effect of preventing bolt loosening over a long period of time. Brief explanation of the drawing

[0015] FIG. 1 is a drawing showing a nylon nut according to the prior art. FIG. 2 is a cross-sectional view illustrating an anti-loosening nut according to embodiments of the present invention. FIG. 3 is an exploded cross-sectional view illustrating an anti-loosening nut according to embodiments of the present invention. FIG. 4 is a partial plan view illustrating an anti-loosening member according to embodiments of the present invention. FIG. 5 is a partial cross-sectional view illustrating an anti-loosening member according to embodiments of the present invention. FIG. 6 is a partially enlarged cross-sectional view illustrating the initial usage state of an anti-loosening nut according to embodiments of the present invention. FIG. 7 is a partially enlarged cross-sectional view illustrating the repeated use state of an anti-loosening nut according to embodiments of the present invention. Specific details for implementing the invention

[0016] The advantages and features of the present invention and the methods for achieving them will become clear by referring to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below but may be implemented in various different forms. These embodiments are provided merely to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention, and the present invention is defined only by the scope of the claims. Throughout the entire specification, the same reference numerals refer to the same components.

[0017] In this specification, when it is stated that a component is located “on” another component, this includes not only cases where a component is in contact with another component, but also cases where another component exists between the two components. Furthermore, in this specification, when it is stated that a part “includes” a certain component, this means that, unless specifically stated otherwise, it does not exclude other components but may include additional components.

[0018] Terms such as “about,” “substantially,” etc., used throughout this specification are used to mean at or near the stated value when inherent manufacturing and material tolerances are presented in the stated meaning, and are used to prevent unscrupulous infringers from unfairly exploiting the disclosure in which precise or absolute values ​​are mentioned to aid in understanding this invention.

[0019] Embodiments of the present invention will be described in detail below with reference to the attached drawings.

[0020] FIG. 2 is a cross-sectional view illustrating an anti-loosening nut according to embodiments of the present invention. FIG. 3 is an exploded cross-sectional view illustrating an anti-loosening nut according to embodiments of the present invention. FIG. 4 is a partial plan view illustrating an anti-loosening member according to embodiments of the present invention. FIG. 5 is a partial cross-sectional view illustrating an anti-loosening member according to embodiments of the present invention. FIG. 6 is a partial enlarged cross-sectional view illustrating the initial usage state of an anti-loosening nut according to embodiments of the present invention. FIG. 7 is a partial enlarged cross-sectional view illustrating the repeated usage state of an anti-loosening nut according to embodiments of the present invention.

[0021] Referring to FIGS. 2 to 7, an anti-loosening nut (100) according to embodiments of the present invention may include a nut body (120) having a bolt fastening hole (110) through which a bolt (200) is fastened, and an anti-loosening member (130) that is inserted and fixed within the bolt fastening hole (110) and prevents loosening by being in close contact with the bolt (200) passing through the bolt fastening hole (110).

[0022] The nut body (120) is configured to form the outer shape of the anti-loosening nut (100) and is provided with a bolt fastening hole (110) formed through along the axial direction (X1) into which a bolt (200) is inserted. The bolt fastening hole (110) may include a screw fastening area (112) having screw threads formed on its inner surface and a member insertion area (114) having an inner diameter larger than that of the screw fastening area (112) and extending along the axial direction (X1). Here, the axial direction (X1) may be defined as the direction in which the bolt (200) is inserted into the bolt fastening hole (110).

[0023] The nut body (120) is made of metal, and its height, outer diameter, and outer surface shape can be varied according to the intended use.

[0024] The anti-loosening member (130) can be inserted and fixed in the member insertion area (114) of the nut body (120). The anti-loosening member (130) generally has a ring shape, and its inner surface can be in close contact with the bolt (200) passing through the bolt fastening hole (110). During the process of fastening the nut body (120) and the bolt (200), screw threads can be formed on the inner surface of the anti-loosening member (130), thereby further strengthening the fastening force with the bolt (200).

[0025] According to an embodiment of the present invention, the anti-loosening member (130) may be composed of a multilayer structure having different physical properties and functions. For example, the anti-loosening member (130) may include a first fastening reinforcing layer (140), a cushioning layer (150), and a second fastening reinforcing layer (160) that are stacked sequentially along the axial direction (X1) from the direction in which the bolt (200) is inserted.

[0026] The first fastening reinforcing layer (140) can provide high fixing force to the bolt (200) during the initial fastening due to strong friction and thread formation. For example, the first fastening reinforcing layer (140) may include a first bottom portion (142) having a ring shape that contacts the bottom surface of the member insertion area (114) and a first side wall portion (144) that contacts the inner surface of the member insertion area (114) and extends along the axial direction (X1) from the edge of the first bottom portion (142). As shown in FIG. 6, threads may be naturally formed on the inner circumference of the first bottom portion (142) to provide strong friction during initial fastening with the bolt (200) (see part A of FIG. 6).

[0027] The first fastening reinforcing layer (140) may be formed using a first fastening reinforcing composition comprising polyamide resin and glass fiber, and the glass fiber may be contained in a certain proportion to ensure high strength and wear resistance. For example, the first fastening reinforcing layer (140) may be formed using a first fastening reinforcing composition comprising 73 to 83 weight% of polyamide resin, 15 to 25 weight% of glass fiber, and 2 to 5 weight% of a first additive comprising at least one of an antioxidant, a slip agent, an antifouling agent, a release agent, and a flame retardant. Through this, the first fastening reinforcing layer (140) can provide appropriate rigidity and thread-forming flexibility when fastened with the bolt (200). Preferably, the first fastening reinforcing layer (140) may be formed using a first fastening reinforcing composition comprising 75 wt% polyamide resin, 20 wt% glass fiber, 0.5 wt% antioxidant, 1.0 wt% slip agent, 1.0 wt% antifouling agent, 0.5 wt% release agent, and 2 wt% flame retardant. In the present invention, the polyamide resin may be polyamide 66 (PA66), but the present invention is not limited thereto.

[0028] The second fastening reinforcement layer (160) has a ring shape with an outer diameter smaller than that of the first bottom portion (142) and can be placed on the first bottom portion (142) with the buffer layer (150) in between. The second fastening reinforcement layer (160) according to the present invention can be implemented to secure high fastening force during initial fastening and to maintain fastening force even during repeated fastening and unfastening processes, thereby providing fastening stability over a long period of time.

[0029] Specifically, the second fastening reinforcement layer (160) can be formed as a layer with higher resistance to wear and deformation than the first fastening reinforcement layer (140) in order to maintain high structural strength even in a repeated fastening environment.

[0030] According to one embodiment, the second fastening reinforcing layer (160) is formed using a second fastening reinforcing composition comprising polyamide resin and glass fibers similar to the first fastening reinforcing layer (140), wherein the ratio of glass fibers to polyamide resin in the second fastening reinforcing composition may be higher than the ratio of glass fibers to polyamide resin in the first fastening reinforcing composition. For example, the second fastening reinforcing layer (160) may be formed using a second fastening reinforcing composition comprising 55 to 63 weight% of polyamide resin, 30 to 40 weight% of glass fibers, and 2 to 5 weight% of a second additive comprising at least one of an antioxidant, a slip agent, an antifouling agent, a release agent, and a flame retardant. Through this, the second fastening reinforcing layer (160) may be formed to maintain high strength and high wear resistance even in a repeated fastening and unfastening environment. Preferably, the second fastening reinforcing layer (160) may be formed using a second fastening reinforcing composition comprising 60 wt% polyamide resin, 35 wt% glass fiber, 0.5 wt% antioxidant, 1.0 wt% slip agent, 1.0 wt% antifouling agent, 0.5 wt% release agent, and 2 wt% flame retardant.

[0031] The second fastening reinforcement layer (160) may include a plurality of slits (162) formed by indenting its inner surface outward, and grooves (164) and protrusions (166) that alternately repeat along the axial direction (X1) may be formed on its inner surface. Additionally, a pressure rod (168) may be inserted into the slit (162). The lower part of the slit (162) may be formed to extend outward and have a wider width than the upper part. The pressure rod (168), inserted into the slit (162) through the upper part of the slit (162), may be drawn outward from the lower part of the slit (162) to be more firmly inserted and fixed into the slit (162).

[0032] The pressure rod (168) is intended to provide pressure to the bolt (200) during repeated fastening and is inserted and fixed inside the slit (162) and protrudes into the groove (164) between adjacent protrusions (166). It may be configured such that the end is formed in a rounded curved shape to minimize wear caused by friction with the threads of the bolt (200). The pressure rod (168) may be formed from a high-elasticity resin (e.g., thermoplastic polyurethane (TPU)) or a wear-resistant engineering plastic (e.g., polyacetal (POM)).

[0033] As shown in FIG. 6, the protrusion (166) of the second fastening reinforcement layer (160) engages strongly with the threads of the bolt (200) during initial fastening, thereby providing high friction and fastening force, which enables stable bolt fixation.

[0034] According to embodiments of the present invention, the second fastening reinforcing layer (160) can be partially elastically deformed through the slit structure during initial fastening, allowing for localized compression force control during bolt insertion and thus providing a uniform fastening force distribution. Furthermore, since the contact surface that wears out during bolt fastening and unfastening is dispersed in slit units, wear is not concentrated, and the structure between the slits absorbs deformation, thereby enhancing durability against repeated fastening. Additionally, as the second fastening reinforcing layer (160) is provided with a groove (164), the fastening pressure is dispersed rather than concentrated, thereby suppressing excessive thread formation on the protrusion (166), and as a result, deformation or wear of the second fastening reinforcing layer (160) itself can be delayed.

[0035] When the protrusions (166) are worn out or deformed due to repeated fastening, as shown in FIG. 7, a pressure rod (168) protruding into the groove (164) protrudes between the worn protrusions (166) and additionally presses the bolt (200), thereby compensating for the reduction in fastening force and maintaining fastening performance for a long period (see part B of FIG. 7).

[0036] In summary, the second fastening reinforcement layer (160) is formed from a composite resin of polyamide resin and high glass fiber content (GF 30~40 wt%), so that it can maintain excellent strength and wear resistance even under repeated fastening loads and friction, and through a structure of multiple grooves (164) and protrusions (166), the protrusions (166) come into contact with the bolt (200) during initial fastening to secure fastening force, and even if the protrusions (166) are worn out due to repeated fastening / unfastening, the pressure rod (168) inserted into the slit (162) protrudes to provide additional pressure, thereby maintaining fastening force for a long period of time.

[0037] In the present invention, three slits (162) are shown formed in the second fastening reinforcing layer (160) (Fig. 4), but the present invention is not limited thereto. In other embodiments, four or more slits (162) may be formed.

[0038] A buffer layer (150) may be interposed between the first fastening reinforcement layer (140) and the second fastening reinforcement layer (160). For example, the buffer layer (150) may include a second bottom portion (152) having a ring shape and disposed on the first bottom portion (142), and a second side wall portion (154) extending from the edge of the second bottom portion (152) along the axial direction (X1) between the first side wall portion (144) and the outer wall of the second fastening reinforcement layer (160).

[0039] According to embodiments of the present invention, the cushioning layer (150) is formed of a material capable of elastic deformation, and by partially absorbing the axial pressure (X1) generated during bolt fastening, it can alleviate the load directly applied to the second fastening reinforcement layer (160) and prevent excessive deformation and thread formation of the second fastening reinforcement layer (160), thereby improving long-term fastening stability and repeated use life.

[0040] To this end, the buffer layer (150) can be formed of a material having excellent elasticity and resilience to withstand repeated loads and changes in the external environment due to repeated fastening, and having weather resistance and durability so that deformation or deterioration does not occur even with long-term use.

[0041] According to one embodiment, the buffer layer (150) may be formed using a buffer composition comprising a resin mixture including a thermoplastic polyurethane elastomer (TPU) and a silicone resin, polytetrafluoroethylene (PTFE) microparticles, a water-soluble polymer resin, a natural extract mixture including rosemary extract, sage extract and persimmon leaf extract, and an oil mixture including grapeseed oil, clove oil and eucalyptus oil.

[0042] The resin mixture is intended to provide high elasticity, resilience, heat resistance, and wear resistance, and may be used in which a thermoplastic polyurethane elastomer and a silicone resin are mixed in a weight ratio of 1:0.5 to 1.

[0043] Polytetrafluoroethylene (PTFE) microparticles can be used to improve wear resistance, and water-soluble polymer resins can be used to improve durability, adhesion, etc. For example, water-soluble acrylic resin or water-soluble epoxy resin may be used as the water-soluble polymer resin, but the present invention is not limited thereto.

[0044] The natural extract mixture is used for natural preservative, antioxidant, and antibacterial effects, and can be used in which rosemary extract, sage extract, and persimmon leaf extract are mixed in a weight ratio of 1:0.5 to 1:0.5 to 1.

[0045] The oil mixture is used for antibacterial, antimicrobial film formation, prevention of spoilage, and improvement of weather resistance, and a mixture of grapeseed oil, clove oil, and eucalyptus oil in a weight ratio of 1:0.1~0.3:0.1~0.3 can be used.

[0046] Optionally, the buffering composition may further include a molding additive. The molding additive may include at least one of an antioxidant, a slip agent, an antifouling agent, a release agent, and a flame retardant. Since each of these additives may be known in the art, a detailed description thereof is omitted.

[0047] For example, a buffering composition may be used that is prepared to include 85 to 95 weight% of a resin mixture in which a thermoplastic polyurethane elastomer and a silicone resin are mixed in a weight ratio of 1:0.1 to 0.3, 1 to 3 weight% of polytetrafluoroethylene (PTFE) microparticles, 0.5 to 2 weight% of a water-soluble polymer resin including a water-soluble acrylic resin or a water-soluble epoxy resin, 0.5 to 2 weight% of a natural extract mixture in which rosemary extract, sage extract, and persimmon leaf extract are mixed in a weight ratio of 1:0.5 to 1:0.5 to 1, and 0.2 to 1 weight% of an oil mixture in which grapeseed oil, clove oil, and eucalyptus oil are mixed in a weight ratio of 1:0.1 to 0.3:0.1 to 0.3. By using a buffering composition prepared with the above-mentioned content ratio, excellent elasticity and resilience of the buffering layer (150) are secured, while weather resistance and resilience stability are enhanced, and wear resistance is secured so that fastening stability can be maintained even in a repeated fastening environment, and the stability of the multilayer structure can be increased by improving interlayer adhesion through the addition of a water-soluble polymer resin.

[0048] Preferably, the buffer layer can be formed using a buffer composition comprising 90% by weight of a resin mixture in which a thermoplastic polyurethane elastomer and a silicone resin are mixed in a weight ratio of 1:0.1 to 0.3, 2% by weight of polytetrafluoroethylene (PTFE) microparticles, 1% by weight of a water-soluble polymer resin including a water-soluble acrylic resin or a water-soluble epoxy resin, 1% by weight of a natural extract mixture in which rosemary extract, sage extract, and persimmon leaf extract are mixed in a weight ratio of 1:0.5 to 1:0.5 to 1, and 1% by weight of an oil mixture in which grapeseed oil, clove oil, and eucalyptus oil are mixed in a weight ratio of 1:0.1 to 0.3:0.1 to 0.3, 0.5% by weight of an antioxidant, 1.0% by weight of a slip agent, 1.0% by weight of an antifouling agent, 0.5% by weight of a release agent, and 2% by weight of a flame retardant.

[0049] A multilayer structured anti-loosening member (130) comprising a first fastening reinforcement layer (140), a buffer layer (150), and a second fastening reinforcement layer (160) can be manufactured into an integrated anti-loosening member (130) by forming pellets using each of the first fastening reinforcement composition, the buffer composition, and the second fastening reinforcement composition described above, and performing a multi-injection molding process using each pellet.

[0050] As described above, the anti-loosening nut (100) including the anti-loosening member (130) according to the embodiments of the present invention can not only secure a high fastening force during initial fastening, but also effectively prevent wear and a decrease in fastening force due to repeated fastening and unfastening of the bolt (200). In particular, the cushioning layer (150) alleviates the compressive load generated during fastening and suppresses deformation of the fastening part, thereby providing long-term fastening stability, and the second fastening reinforcing layer (160) can provide wear resistance and resilience to maintain fastening force even in a repeated fastening environment.

[0051] As a result, the anti-loosening nut (100) of the present invention has significantly improved durability and fastening reliability, and can exhibit an excellent effect of preventing bolt loosening over a long period of time.

[0052] Although embodiments of the present invention have been described illustratively with reference to the attached drawings, those skilled in the art will understand that the present invention may be implemented in other specific forms without changing its technical concept or essential features. Therefore, the embodiments and applications described above should be understood as illustrative in all respects and not restrictive. Explanation of the symbols

[0053] 100: Anti-loosening nut 120: Nut body 130: Anti-loosening member 140: First fastening reinforcement layer 150: Buffer layer 160: Second fastening reinforcement layer 168: Pressure rod

Claims

Claim 1 A nut body including a bolt fastening hole through which a bolt is fastened; and includes a ring-shaped anti-loosening member that is inserted and fixed within the bolt fastening hole and prevents loosening by being in close contact with a bolt penetrating the bolt fastening hole, wherein the bolt fastening hole includes a screw fastening area having screw threads formed on its inner surface and a member insertion area having an inner diameter larger than that of the screw fastening area and extending along the axial direction in which the bolt is inserted, and the anti-loosening member includes a first fastening reinforcement layer, a buffer layer, and a second fastening reinforcement layer that are sequentially stacked along the axial direction from the direction in which the bolt is inserted, wherein the first fastening reinforcement layer includes a first bottom portion having a ring shape that contacts the bottom surface of the member insertion area and a first side wall portion that contacts the inner surface of the member insertion area and extends along the axial direction from the edge of the first bottom portion, and the second fastening reinforcement layer has a ring shape with an outer diameter smaller than that of the first bottom portion and is disposed on the first bottom portion with the buffer layer in between, and includes a plurality of slits formed by its inner surface being indented outward, and on its inner surface thereare grooves that are alternately repeated along the axial direction and An anti-loosening nut comprising: a second bottom portion having a ring shape disposed on the first bottom portion; a second side wall portion extending from the edge of the second bottom portion along the axial direction between the first side wall portion and the outer wall of the second fastening reinforcement layer; wherein protrusions are formed, a pressure rod is inserted and fixed inside the slit and protrudes into a groove between adjacent protrusions; and a cushioning layer is interposed between the first fastening reinforcement layer and the second fastening reinforcement layer. Claim 2 In claim 1, each of the first fastening reinforcing layer and the second fastening reinforcing layer comprises polyamide resin and glass fiber, wherein the ratio of glass fiber content to polyamide resin in the second fastening reinforcing layer is higher than the ratio of glass fiber content to polyamide resin in the first fastening reinforcing layer. Claim 3 An anti-loosening nut according to claim 2, wherein the first fastening reinforcing layer is formed using a first fastening reinforcing composition comprising 73 to 83 weight% polyamide resin, 15 to 25 weight% glass fiber, and 2 to 5 weight% of a first additive comprising at least one of an antioxidant, a slip agent, an antifouling agent, a release agent, and a flame retardant, and the second fastening reinforcing layer is formed using a second fastening reinforcing composition comprising 55 to 63 weight% polyamide resin, 30 to 40 weight% glass fiber, and 2 to 5 weight% of a second additive comprising at least one of an antioxidant, a slip agent, an antifouling agent, a release agent, and a flame retardant. Claim 4 In claim 3, the anti-loosening nut is formed using a buffering composition comprising a resin mixture including thermoplastic polyurethane elastomer (TPU) and silicone resin, polytetrafluoroethylene (PTFE) microparticles, water-soluble polymer resin, a natural extract mixture including rosemary extract, sage extract and persimmon leaf extract, and an oil mixture including grapeseed oil, clove oil and eucalyptus oil. Claim 5 An anti-loosening nut according to claim 4, wherein the buffer composition comprises 85 to 95 weight% of a resin mixture in which a thermoplastic polyurethane elastomer and a silicone resin are mixed in a weight ratio of 1:0.1 to 0.3, 1 to 3 weight% of polytetrafluoroethylene (PTFE) microparticles, 0.5 to 2 weight% of a water-soluble polymer resin including a water-soluble acrylic resin or a water-soluble epoxy resin, 0.5 to 2 weight% of a natural extract mixture in which rosemary extract, sage extract, and persimmon leaf extract are mixed in a weight ratio of 1:0.5 to 1:0.5 to 1, and 0.2 to 1 weight% of an oil mixture in which grapeseed oil, clove oil, and eucalyptus oil are mixed in a weight ratio of 1:0.1 to 0.3:0.1 to 0.

3. Claim 6 In claim 1, the pressure rod is formed with a rounded curved end and is an anti-loosening nut made of thermoplastic polyurethane (TPU) or polyacetal (POM) material.

Images