Hot melting nut

Abstract

The utility model relates to the technical field of nut fasteners, and discloses a hot melting nut, the outer wall of one end of a hot melting nut body is provided with a second thread knurl and a first thread knurl, and the outer wall of the other end of the hot melting nut body is provided with two sealing rings; the thread knurl II is located between the thread knurl I and the sealing ring, hot melting overflow grooves are formed in the two sides of the thread knurl II, and a hot melting dip angle is arranged on the side, away from the thread knurl I, of the thread knurl II. Due to the difference design that the outer diameter of the lower-layer knurl is 0.2 mm-0. 5mm smaller than that of the upper-layer knurl, it is ensured that the uppermost-layer knurl can obtain sufficient flash filling in the hot melting process; by means of the design, the drawing force and the torque strength of the hot melting nut are remarkably improved, and the reliable connection performance can be kept under the high-load condition.

Description

TECHNICAL FIELD

[0001] The utility model relates to nut fastener technical field especially relates to a hot melt nut. BACKGROUND

[0002] With the popularization of the lightweight design concept of passenger cars, a large number of non-structural parts on the vehicle begin to be designed in the way of "plastic instead of steel", such as oil pan, valve chamber cover, intake manifold and interior and exterior trim wrapping parts. This design needs to embed metal nuts at the connecting parts of plastic parts to improve the strength and connection performance of the product. Traditionally, steel nuts, copper nuts and aluminum nuts are often used in this field. However, the aluminum nuts widely used in the prior art have certain advantages in lightweight, but they have the problem of insufficient rigidity in actual application. The aluminum nuts are prone to deformation during the high-pressure injection molding process of the injection molding machine, resulting in insufficient product forming precision and stability. SUMMARY

[0003] The utility model discloses a hot melt nut which solves the problems in the prior art.

[0004] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0005] A hot melt nut comprises a hot melt nut body, one end of the hot melt nut body is provided with a thread knurl two and a thread knurl one, and the other end of the hot melt nut body is provided with two sealing rings; the thread knurl two is located between the thread knurl one and the sealing ring, both sides of the thread knurl two are provided with hot melt overflow grooves, and the side of the thread knurl two away from the thread knurl one is provided with a hot melt inclination angle.

[0006] Preferably, the threads on the thread knurl two and the thread knurl one are straight threads.

[0007] Preferably, the threads on the thread knurl two and the thread knurl one are S-shaped threads.

[0008] Preferably, the threads on the thread knurl two and the thread knurl one are arranged in opposite directions.

[0009] Preferably, the thread knurl depth of the thread knurl two and the thread knurl one is 0.3-1mm.

[0010] Preferably, the outer diameter of the thread knurl two is 0.2-0.5mm smaller than the outer diameter of the thread knurl one.

[0011] Preferably, the depth of the hot melt overflow groove is not more than 3 / 4 of the thickness of the side wall of the hot melt nut body.

[0012] Preferably, the two sealing rings are made of different materials.

[0013] Preferably, the hot melt inclination angle is 15°-60°.

[0014] The utility model discloses the beneficial effect that:

[0015] 1, promote the drawing force and the torque intensity: the nut surface design positive and negative inclined thread knurling ( can be straight thread or S type thread), through the optimization of knurling depth (0.3mm-1mm), and the difference design of the outer diameter of lower layer knurling is 0.2mm-0.5mm less than the outer diameter of upper layer knurling, ensure that the uppermost layer knurling can obtain sufficient overflow filling in the hot melt process;The design significantly improves the drawing force and the torque intensity of hot melt nut, so that it can maintain reliable connection performance under high load conditions.

[0016] 2, enhance the sealing performance and environmental adaptability: the product is provided with two sealing rings, which are made of different materials respectively to realize excellent high-temperature and low-temperature airtightness. The sealing ring and the plastic part are precisely matched but do not participate in hot melting, avoiding the influence of high temperature on the performance of the sealing ring material, ensuring long-term stable sealing under extreme temperature conditions;The double-sealing ring design effectively avoids the sealing failure problem caused by the difference of thermal expansion and cold shrinkage, significantly improving the applicability of the product in complex environment.

[0017] 3, optimize the hot melt effect: a hot melt overflow groove is designed at the contact part of the nut surface and the plastic part, which is used to accommodate excess hot melt plastic, ensuring that the overflow can be evenly distributed and form a firm anchoring structure. This design not only improves the stability of hot melt connection, but also avoids the combination defects caused by uneven overflow;By setting a hot melt introduction inclination angle of 15°-60°, the nut can flexibly adapt to the fluidity of different materials and process requirements during the hot melt process, so as to balance the connection accuracy and installation efficiency.

[0018] 4, avoid product deformation caused by injection pressure: hot melt process is used instead of traditional high-pressure injection molding process to connect the nut and the plastic part, effectively avoiding the deformation problem of aluminum nut caused by high-pressure injection molding, improving the forming quality and connection consistency.

[0019] 5, improve product reliability and service life: the utility model discloses the structure design such as positive and negative inclined thread knurling, double sealing ring and hot melt overflow groove, which is optimized from mechanical properties, sealing performance and hot melt process adaptability, ensuring high strength, high stability and long service life of the nut and plastic part connection;The introduction of hot melt process avoids the stress concentration problem in traditional process, improving the reliability of the product under high temperature, low temperature and vibration working conditions.

[0020] 6. Applicable to multiple scenarios, multiple working conditions: the hot melt nut is applicable to various types of plastic non-structural parts scenes which need high strength connection and air tightness performance, including passenger car oil pan, valve chamber cover, intake manifold and the like. At the same time, it is also applicable to industrial machinery, household appliances and electronic equipment fields, and working conditions which have demand for lightweight and high-performance connecting parts. BRIEF DESCRIPTION OF DRAWINGS

[0021] Fig. 1 A side surface structure schematic view of a hot melt nut is proposed for the embodiments of the utility model;

[0022] Fig. 2 A three-dimensional structure schematic view of a hot melt nut is proposed for the embodiments of the utility model.

[0023] In the figure: 1-hot melt nut body, 2-hot melt angle, 3-thread knurl two, 4-thread knurl one, 5-sealing ring, 6-hot melt overflow groove. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments.

[0025] Referring to Figs. 1-2 A hot melt nut, comprising a hot melt nut body 1, one end outer wall of the hot melt nut body 1 is provided with thread knurl two 3 and thread knurl one 4, and the other end outer wall of the hot melt nut body 1 is provided with two sealing rings 5; the thread knurl two 3 is located between the thread knurl one 4 and the sealing ring 5, both sides of the thread knurl two 3 are provided with hot melt overflow grooves 6, and one side of the thread knurl two 3 away from the thread knurl one 4 is provided with a hot melt angle 2.

[0026] As a preferred embodiment of the utility model, the threads on the thread knurl two 3 and the thread knurl one 4 are straight threads.

[0027] As a preferred embodiment of the utility model, the threads on the thread knurl two 3 and the thread knurl one 4 are S-shaped threads.

[0028] As a preferred embodiment of the present utility model, the threads on the thread knurling two 3 and the thread knurling one 4 are oppositely arranged, that is, the thread direction on the thread knurling one 4 is opposite to that on the thread knurling two 3. This opposite thread design can provide better fixation and stability during the installation of the hot melt nut, avoiding the loosening or displacement of the nut due to material expansion or shrinkage during the hot melting process. In addition, the oppositely arranged threads can effectively increase the friction between the nut and the matching components, enhance the connection strength, and ensure the sealing performance and service life. Specifically, the thread knurling one 4 can be set as right-handed threads, while the thread knurling two 3 can be set as left-handed threads to adapt to different application requirements, especially in scenarios requiring bidirectional force, providing more reliable combination effect.

[0029] As a preferred embodiment of the present utility model, the thread knurling depth on the thread knurling two 3 and the thread knurling one 4 is 0.3mm-1mm, which can be designed and adjusted according to the drawing force requirement. The design of the thread knurling depth directly affects the gripping force and connection strength of the nut during installation. When the drawing force is large, the thread knurling depth can be appropriately increased to ensure that the threads can provide sufficient friction and stability when subjected to external forces, avoiding nut loosening or slipping. Conversely, when the drawing force requirement is low, the thread knurling depth can be reduced to reduce frictional resistance, ensuring quick disassembly and convenient operation.

[0030] In addition, the depth of the thread knurling is closely related to the properties of the material, the size of the nut, and the specific requirements of the working environment. For example, in high-load or high-vibration application scenarios, deeper thread knurling helps to increase the friction coefficient, thereby improving the pull-out resistance of the connecting piece. In some scenarios requiring quick installation and disassembly, moderate shallow thread knurling depth can be used to avoid unnecessary friction, optimizing the disassembly process.

[0031] As a preferred embodiment of the present utility model, the outer diameter of the thread knurling two 3 is 0.2-0.5mm smaller than that of the thread knurling one 4, in order to ensure that the thread knurling one 4 is filled with overflow. Specifically, the smaller outer diameter of the thread knurling two 3 can provide appropriate space for the thread knurling one 4, so that during the hot melting process, the overflow can smoothly fill into the grooves of the thread knurling one 4, thereby enhancing the sealing performance and firmness between the nut and the mating piece.

[0032] This design can also avoid the phenomenon of poor sealing or structural instability caused by excessive overflow. By controlling the outer diameter difference between the thread knurling two 3 and the thread knurling one 4, the flowability of the overflow can be optimized, allowing it to uniformly fill into the voids of the thread knurling one 4, ensuring that the connection site has good hot melting effect and mechanical strength. In addition, this outer diameter difference design also plays a role in distributing stress in high-temperature environments and reducing thread deformation or rupture caused by thermal expansion.

[0033] Notably, the proper reduction of the outer diameter of the thread knurling 2 makes the installation of the hot melt nut more smooth and convenient in practical applications, especially in situations where quick installation and long-term stability are required. By optimizing the outer diameter gap, the filling amount and flowability of the overflow can be balanced, making the function of the hot melt nut more efficient and reliable.

[0034] As a preferred embodiment of the present utility model, the depth of the hot melt overflow groove 6 is not more than 3 / 4 of the thickness of the side wall of the hot melt nut body 1, to ensure the balance between mechanical strength and functional performance of the hot melt nut body 1. During the hot melting process, when the hot melt nut body 1 contacts the plastic product, part of the hot melt plastic will overflow into the hot melt overflow groove 6. The depth of the hot melt overflow groove 6 not only can effectively accommodate the overflowed plastic, but also can be adjusted to adapt to different types of hot melt materials by adjusting the depth appropriately, to achieve the best bonding effect.

[0035] Specifically, the depth of the hot melt overflow groove 6 can be optimized and adjusted according to the flowability, melting point and thermal expansion characteristics of the hot melt plastic. For example, for hot melt plastic with strong flowability or low melting point, the depth of the overflow groove can be appropriately increased to accommodate more overflow, thereby avoiding the influence of plastic overflow on the appearance or function of the product. For materials with poor flowability, a shallower overflow groove depth can be selected to ensure that the overflow can fully fill the overflow groove and be firmly embedded after cooling, improving the mechanical strength and sealing performance of the bonding part.

[0036] In addition, the design of the overflow groove also plays a role in dispersing thermal stress, which can effectively reduce the stress concentration problem caused by thermal expansion and contraction of the plastic during the hot melting process, preventing cracks or deformation of the hot melt nut body 1. The width and depth ratio of the overflow groove can be further optimized to make the overflow more evenly distributed during the cooling process, thereby improving the reliability of the connection between the hot melt nut body 1 and the plastic product.

[0037] In summary, the design parameters of the hot melt overflow groove 6 not only meet the process requirements of different hot melt materials, but also enhance the applicability of the hot melt nut body 1 through scientific depth adjustment, ensuring its excellent bonding performance and long-term use stability in various complex environments.

[0038] As a preferred embodiment of the present utility model, the two sealing rings 5 are made of different materials, which have excellent high-temperature and low-temperature resistance, and can ensure excellent air tightness and sealing effect in extreme temperature environments. The inner diameter of the sealing ring 5 precisely matches the outer diameter of the hot melt nut body 1, so that it can form a reliable mechanical bond during installation, while avoiding unnecessary interaction or deformation between the sealing ring 5 and the hot melt material.

[0039] The material selection of the sealing ring 5 is optimized according to the specific requirements of the application scenario. For example, the upper sealing ring 5 can use a material with strong high-temperature resistance (such as silicone rubber, fluororubber, etc.) to adapt to high-temperature operation or hot melting process during equipment operation; the lower sealing ring 5 can use a material with more elasticity and low-temperature resistance (such as nitrile rubber or polytetrafluoroethylene) to ensure stable sealing performance in low-temperature environments. The combination of materials enables the two sealing rings 5 to work together during the installation and subsequent use of the hot melting nut, providing double sealing protection and enhancing the overall air tightness and environmental adaptability.

[0040] In addition, the unique design of the sealing ring 5 ensures that it does not participate in the hot melting process during installation, avoiding the impact of stress or deformation caused by high-temperature hot melting on the performance of the sealing ring 5. This feature allows the sealing ring 5 to maintain its initial elasticity and structural integrity after hot melting is completed, thereby providing reliable sealing effects in subsequent use for a long time.

[0041] To further enhance the function of the sealing ring 5, the outer surface of the sealing ring 5 can be designed with micro-texture or groove structure to improve the friction and sealing capacity between it and the mating surface. In addition, the sealing ring 5 can be customized in size and shape according to different industrial application requirements, thereby being suitable for high-strength sealing requirements in complex environments, such as high-pressure systems, corrosive gas environments, or extreme temperature difference conditions.

[0042] In summary, the multi-material design and precise fit of the sealing ring 5 not only improve the adaptability and reliability of the hot melting nut, but also lay a technical foundation for its application in a wide range of industrial fields, enabling it to perform well in harsh conditions such as high temperature, low temperature, pressure, and vibration.

[0043] As a preferred embodiment of the present utility model, the angle of the hot melting inclination 2 is 15°-60°, and the optimized angle in this range can adapt to the needs of different hot melting processing scenarios, significantly improving the combination effect and installation efficiency between the hot melting nut and the mating part. Specifically, a smaller inclination (such as 15°-30°) is suitable for situations that require slower melting rate or higher precision, which can ensure uniform distribution of hot melting material on the inclined surface, thereby improving the integrity and sealing performance of the nut and mating part. A larger inclination (such as 45°-60°) is suitable for situations that require fast melting and large-area contact, which can accelerate the flow of hot melting material, reduce installation time, and improve work efficiency.

[0044] The angle range of the hot melt inclination 2 not only directly affects the melting speed and flow direction of the material, but also plays an important role in the filling effect of the overflow groove 6 and the final connection strength. When the angle is moderate (such as 30°-45°), the hot melt material can quickly flow to the overflow groove under the guidance of the inclined surface, while forming a uniform transition layer between the hot melt nut and the plastic part, maximizing the stability of the enhanced connection.

[0045] In addition, the angle design of the hot melt inclination 2 also needs to be combined with the properties of the material, the working temperature and the specific application environment. For example, for materials with higher melting points, a larger inclination angle can be selected to improve the melting speed; while for materials with low melting points or poor flowability, a smaller inclination angle can be used to better control the flow path and distribution range of the hot melt material.

[0046] In practical applications, the angle of the hot melt inclination 2 can also be further adjusted according to the installation direction of the equipment and the process requirements. For example, in the working condition that needs to withstand high vibration or high load, an inclination angle closer to 15° can be selected to increase the contact area and improve the anti-vibration performance; while in the scene that needs fast and low-cost installation, an inclination angle closer to 60° can be selected to achieve more efficient processing effect.

[0047] In summary, the angle design of the hot melt inclination 2 ensures the applicability of the hot melt nut in various complex environments through scientific range and flexible adjustment, which can not only meet the needs of high strength and high stability, but also take into account the installation efficiency and the diversification requirements of the hot melt process, thereby significantly improving the overall performance and use value of the product.

[0048] The above describes only the preferred specific implementation of the present application, but the protection scope of the present application is not limited to this. Any skilled person in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A thermosetting nut, comprising a thermosetting nut body (1), characterized in that, The outer wall of one end of the hot melt nut body (1) is provided with thread knurling two (3) and thread knurling one (4), and the outer wall of the other end of the hot melt nut body (1) is provided with two sealing rings (5); The second thread knurling (3) is located between the first thread knurling (4) and the sealing ring (5). Both sides of the second thread knurling (3) are provided with hot melt overflow grooves (6), and the side of the second thread knurling (3) away from the first thread knurling (4) is provided with a hot melt tilt angle (2).

2. The thermosetting nut according to claim 1, characterized in that, The threads on the second (3) and the first (4) of the thread knurling are straight threads.

3. A thermosetting nut according to claim 1, characterized in that, The threads on the second (3) and the first (4) of the thread knurling are S-type threads.

4. A thermosetting nut according to any one of claims 1-3, characterized in that, The threads on the second (3) and the first (4) of the thread knurling are set in opposite directions.

5. A thermosetting nut according to claim 1, characterized in that, The thread knurling depth on the second (3) and the first (4) thread knurling is 0.3mm-1mm.

6. A thermosetting nut according to claim 1, characterized in that, The outer diameter of the second thread knurling (3) is 0.2-0.5 mm smaller than the outer diameter of the first thread knurling (4).

7. A thermosetting nut according to claim 1, characterized in that, The depth of the hot melt overflow groove (6) does not exceed 3 / 4 of the side wall thickness of the hot melt nut body (1).

8. A thermosetting nut according to claim 1, characterized in that, The two sealing rings (5) are made of different materials.

9. A thermosetting nut according to claim 1, characterized in that, The angle of the hot melt tilt (2) is 15°-60°.

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