Internal and external thread nut

Abstract

The utility model relates to the technical field of fasteners, and discloses a nut with internal and external threads, which comprises a cylindrical nut end head, an inner thread, an outer thread and an inner thread, and is characterized in that the outer end face of the nut end head is provided with external threads; the mounting hole is formed in one side of the nut end and is a hexagonal through hole, and internal threads are arranged on the inner end face of the mounting hole. Through the internal and external threads which are compactly designed and integrated, the internal space layout of equipment is better optimized, and the technical problems that a fastener is difficult to maintain and replace parts and is difficult to connect under the condition of space limitation are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of fasteners, in particular to an internal and external thread nut. Background Art

[0002] In the prior art, internal and external thread nuts are commonly used fasteners in mechanical connections and are widely used in the industrial and construction fields. Their basic function is to fix or support other components through threaded connections. For example, in mechanical assembly and various engineering applications, it is often necessary to combine two different types of threaded connections. When it is necessary to combine a component with an external thread with another component that can only be connected through an internal thread, an internal and external thread nut can be used as a transitional connection. Its external thread can be matched with the internal thread of one component, and its internal thread can be connected to the external thread of another component, thus realizing the conversion between different threaded connection methods.

[0003] For example, consider the installation of certain automotive engine components. The engine block has an internally threaded hole for connecting a sensor with external threads. However, the sensor's external thread size doesn't match the internal thread size of a pipe that also needs to be connected. This is where a male-female nut comes in handy. Its external thread connects to the internal thread of the block, while its internal thread connects to the external thread of the pipe, allowing two components that would otherwise be impossible to connect to fit together smoothly.

[0004] Furthermore, internal and external thread nuts are needed to solve the problem of connections within space constraints. In the compact spaces of some equipment, conventional nut and bolt combinations cannot be used to achieve connections. Internal and external thread nuts can provide an effective connection solution within limited spaces. They can connect to the main structure through external threads in one direction and connect to other components through internal threads in the other direction, reducing space requirements.

[0005] For example, in the assembly of small electronic device casings, the internal space is too narrow to accommodate the rotation of ordinary nuts and bolts. A male-female nut can be first fixed to one side of the casing with its external threads, and then connected to a small component with external threads on the other side using its internal threads. This allows components to be fastened in a smaller space, avoiding the problem of assembly being unable to be completed due to insufficient space.

[0006] In addition, male and female thread nuts need to solve the connection problem of facilitating repair and replacement of components. When a component in a complex device requires frequent repair or replacement, male and female thread nuts can provide a more convenient way to disassemble and reinstall. Compared to other complex connection structures, male and female thread nuts can relatively easily separate two connected components and then reconnect them after repair or replacement.

[0007] For example, in industrial production lines, conveyor belts often have supporting structures connected to the main frame via threaded nuts. When these structures become worn and need replacement, threaded nuts allow for quick removal of the old structure, replacement of the new component, and subsequent reattachment to the main frame using threaded nuts, reducing the time and effort required for equipment maintenance.

[0008] Therefore, there is an urgent need for a compact design with integrated internal and external threads to improve the compactness of the overall design, to better optimize the internal space layout of the equipment, and to solve the technical problems of existing fasteners in that they are difficult to repair and replace parts and difficult to connect under space constraints. Utility Model Content

[0009] In view of this, the utility model proposes an internal and external thread nut, which aims to solve the technical problems of existing fasteners in that they are difficult to repair and replace parts and difficult to connect under space constraints.

[0010] The utility model provides a nut with internal and external threads, comprising:

[0011] The nut end is cylindrical and has an external thread on its outer end surface;

[0012] The mounting hole is opened on one side of the nut end, and the mounting hole is a hexagonal through hole, and an internal thread is provided on the inner end surface of the mounting hole.

[0013] Preferably, the external thread is opened along the outer wall surface from the opposite side of the nut end.

[0014] Preferably, the internal thread is opened from the opposite side of the nut end, and the internal thread and the mounting hole are opened along the same center point.

[0015] Preferably, the length of the external thread is smaller than the length of the internal thread.

[0016] Preferably, the ratio of the length of the external thread to the length of the internal thread is .

[0017] Preferably, the ratio of the tooth height of the external thread to the tooth height of the internal thread is 2.

[0018] Preferably, the pitch of the external thread is equal to the pitch of the internal thread.

[0019] Preferably, a transition angle is provided on the opposite side of the nut end, and the transition angle is greater than 50° and less than 60°.

[0020] Preferably, the surface of the nut end is plated with zinc-nickel alloy, with a film thickness of ≥12 μm.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] 1. Simplified assembly: The number of fasteners is reduced. The internal and external thread nuts integrate two different diameter threads into one part, reducing the number of fasteners required and simplifying the assembly process. This improves assembly efficiency. Since the number of fasteners is reduced, assembly time is shortened, and production efficiency is improved.

[0023] 2. Space saving: The compact design of the internal and external thread nuts allows for use in limited space, making them particularly suitable for installation in small equipment or complex structures. By integrating internal and external threads, the internal space layout of the equipment is optimized, improving the compactness of the overall design. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present invention. The same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0025] Figure 1 A first structural diagram of an internal and external thread nut provided in an embodiment of the present utility model;

[0026] Figure 2 A left side view of an internal and external thread nut provided in an embodiment of the present utility model;

[0027] Figure 3 This is a second structural schematic diagram of the internal and external thread nut provided in an embodiment of the utility model.

[0028] In the figure: 1, nut end; 11, external thread; 111, lowest point of external thread; 112, highest point of external thread; 12, internal thread; 121, lowest point of internal thread; 122, highest point of internal thread; 2, mounting hole;

[0029] In addition, D1 is the length of the external thread; D2 is the length of the internal thread; M1 is the tooth height of the external thread; M2 is the tooth height of the internal thread; and C is the transition angle. DETAILED DESCRIPTION

[0030] The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0031] In the description of this application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0032] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. Throughout this application, unless otherwise specified, "plurality" means two or more.

[0033] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0034] The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0035] In the description of this application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0036] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. Throughout this application, unless otherwise specified, "plurality" means two or more.

[0037] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0038] See Figure 1 As shown, this embodiment provides an internal and external thread nut, including:

[0039] The nut end 1 is cylindrical, and its outer end surface is provided with an external thread 11;

[0040] The mounting hole 2 is provided on one side of the nut end 1 . The mounting hole 2 is a hexagonal through hole, and an internal thread 12 is provided on the inner end surface thereof.

[0041] In some embodiments of the present application, the nut end 1 includes:

[0042] The external thread 11 is opened along the outer wall surface from the opposite side of the nut end 1.

[0043] In some embodiments of the present application, the mounting hole 2 includes:

[0044] The internal thread 12 is opened from the opposite side of the nut end 1, and the internal thread 12 and the mounting hole 2 are opened along the same center point.

[0045] Specifically, a specific embodiment is given:

[0046] The distance between opposite sides of the hexagonal corner head of the mounting hole 2 is 17±0.25 mm.

[0047] The size of the external thread 11 is M12x1.25-6h, which means that the diameter of the external thread 11 is 12 mm and the pitch is 1.25 mm.

[0048] The size of the internal thread 12 is M8x1.25-6H, which means that the diameter of the internal thread 12 is 8 mm and the pitch is 1.25 mm.

[0049] Among them, h=0.5H, and H is the external thread height M1, which refers to the distance from the lowest point 111 of the external thread to the highest point 112 of the external thread, and h is the internal thread height M2, which refers to the distance from the lowest point 121 of the internal thread to the highest point 122 of the internal thread.

[0050] In some embodiments of the present application, the length of the external thread 11 is smaller than the length of the internal thread 12 .

[0051] See Figure 2-3 As shown, in some embodiments of the present application, the ratio of the length of the external thread 11 to the length of the internal thread 12 is .

[0052] Specifically, the ratio of the external thread length D1 to the internal thread length D2 of the present application is .

[0053] It is understandable that the longer internal thread 12 focuses on the stability of the internal connection components. In some precision instruments and equipment, the internal component connection may require a longer internal thread 12 to ensure accurate positioning and a secure connection, while the external thread 11 only serves to assist in fixing and simply connect with external equipment.

[0054] In some embodiments of the present application, the ratio of the tooth height of the external thread 11 to the tooth height of the internal thread 12 is 2.

[0055] It's understandable that when the ratio of the thread height of external thread 11 to the thread height of internal thread 12 is 2, the external thread 11 portion is often able to withstand greater loads. The relatively large thread height of external thread 11 means a larger cross-sectional area at the root of the thread, much like a thicker pillar can withstand greater weight. When the connection structure is subjected to axial tension, the external thread 11 can bear the majority of the force, effectively dispersing the stress.

[0056] For example, in mechanical connections subject to significant tension, such as crane cable connections or cable anchors on large bridges, this internal and external thread nut can better leverage the load-bearing advantages of the external thread 11, ensuring a secure and reliable connection. Furthermore, this allows for a specific load-bearing capacity between the internal and external threads, allowing for a reasonable distribution of load based on actual needs, improving the load-bearing efficiency of the entire nut.

[0057] The greater thread height of external thread 11 facilitates deeper thread engagement when connecting to a component with internal thread 12. This acts like a deeper groove, effectively locking the mating component. This deep engagement of external thread 11 effectively prevents the nut from loosening or disengaging from the external component when subjected to vibration, impact, or lateral forces.

[0058] At the same time, the relatively small thread height of the internal thread 12 reduces interference with internal components while ensuring connection with the internal component with the external thread 11. This allows the internal component to be more easily screwed into the internal thread 12 of the nut during assembly. After connection, the fit between the internal and external threads is more flexible, allowing the entire connection structure to better adapt to different working environments and stress conditions, improving the tightness and stability of the connection.

[0059] In some embodiments of the present application, the pitch of the external thread 11 is equal to the pitch of the internal thread 12 .

[0060] It is understandable that when the pitch of the external thread 11 is equal to the pitch of the internal thread 12, the screw-in and screw-out speeds of the internal and external threads can be kept consistent during the installation process. For example, when connecting the internal and external nuts to the component with the external internal thread 12 and the component with the internal external thread 11 at the same time, the operator can complete the installation with a relatively stable and uniform rotation motion without worrying about the installation difficulties caused by the asynchrony of the internal and external threads. This synchronization is like two gears cooperating with each other at the same pitch, making the installation process smoother and more efficient. In addition, equal pitch can ensure that the force distribution of the internal and external threads is more uniform after they are screwed together. Because the pitch is the same, the tooth profiles of the internal and external threads are corresponding in the axial and circumferential distributions. When subjected to axial tension or pressure, each pair of internal and external threads can share the load evenly.

[0061] Furthermore, from a loosening resistance perspective, the equal-pitch design reduces the tendency for relative displacement between the internal and external threads due to pitch differences. Under vibration or dynamic loads, the internal and external threads maintain a tight fit, reducing the likelihood of loosening. For example, in connecting moving parts in industrial machinery, using this type of equal-pitch internal and external nut can effectively prevent loosening and ensure the proper functioning of the machine.

[0062] In some embodiments of the present application, a transition angle C is provided on the opposite side of the nut end 1, and the transition angle C is greater than 50° and less than 60°.

[0063] Specifically, the presence of the transition angle C enables a more even distribution of force between the threads and the nut body during tightening. Compared to nuts without the transition angle C, stress concentration is significantly reduced, reducing the risk of localized excessive stress leading to nut damage or fatigue failure, thereby improving the nut's overall strength and service life. Furthermore, when the nut is tightened, the transition angle C forms a tighter fit with the bolt or other connecting component, ensuring a more secure connection and effectively preventing loosening. This structure maintains connection reliability under dynamic loads or vibration, reducing safety hazards caused by loosening. Furthermore, during installation, the transition angle C acts as a guide, facilitating easier alignment and engagement of the nut with the bolt or other threaded component. This guiding function improves installation efficiency, reducing time and labor costs, especially in applications with limited space or difficult access. Furthermore, the transition angle C ensures smoother contact between the nut and the bolt during thread engagement, reducing friction and wear between the threads. This not only makes installation smoother, but also extends the service life of the nut and bolt, reducing maintenance costs.

[0064] In some embodiments of the present application, the surface of the nut end 1 is plated with zinc-nickel alloy, and the film thickness is ≥12 μm.

[0065] Specifically, surface plating with zinc-nickel alloy, with a film thickness of 12μm or greater, can significantly improve the corrosion resistance and other technical effects of fasteners. Furthermore, treatment with a neutral salt spray spray process ensures no white rust for 240 hours and no red rust for 1008 hours, and the mechanical properties of the threads meet the 9.8 requirements of ISO898. It is understood that zinc-nickel alloy coatings have excellent corrosion resistance, especially in salt spray environments, where they outperform pure zinc plating. The nickel content in zinc-nickel alloys can enhance the corrosion resistance of the coating and extend its service life. In harsh environments (such as marine environments, industrial atmospheres, and strong acid and alkaline environments), zinc-nickel alloy coatings can provide decades of corrosion protection. When even slight scratches appear on the coating surface, the zinc content in the zinc-nickel alloy can continue to provide sacrificial anodic protection, preventing corrosion of the substrate.

[0066] Furthermore, the zinc-nickel alloy coating offers a smooth surface and low friction coefficient, helping to reduce frictional resistance during the tightening process. This not only improves assembly efficiency but also reduces thread damage and galling caused by excessive friction. Furthermore, the nickel alloy coating effectively prevents internal and external thread nuts from sticking during prolonged storage or use, especially in humid or corrosive environments. This is particularly important for nuts that require frequent assembly and disassembly, as it prevents disassembly difficulties caused by sticking.

[0067] For example, within a car's engine compartment, nuts secure key components such as engine mounts, exhaust pipes, and oil pans. These areas are frequently exposed to harsh environments, including high temperature, high humidity, oil leaks, and acidic gases (such as combustion products). These conditions can easily lead to rapid corrosion of standard galvanized nuts, impacting the safety and reliability of the vehicle. Nuts coated with a zinc-nickel alloy, however, can significantly extend the service life of engine compartment fasteners, reduce corrosion-related failure rates, and lower repair costs. Furthermore, the nuts' reliability and durability are enhanced, ensuring safe engine operation.

[0068] Compared with the prior art, the beneficial effects of the present invention are:

[0069] The number of fasteners is reduced. The internal and external thread nuts integrate two different diameter threads into one part, reducing the number of fasteners required and simplifying the assembly process. The assembly efficiency is improved. Since the number of fasteners is reduced, the assembly time is shortened, and production efficiency is improved. The compact design of the internal and external thread nuts can be used in places with limited space, and is particularly suitable for installation in small equipment or complex structures. By integrating the internal thread 12 and the external thread 11, the internal space layout of the equipment is better optimized and the compactness of the overall design is improved. In addition, by setting the reasonable internal and external thread dimensions, safety and reliability are better increased; moreover, the transition angle C is used to reduce stress during installation and disassembly; finally, the corrosion resistance of the fasteners is improved through the coating process and other technical effects.

[0070] Those skilled in the art will understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

[0071] Those skilled in the art will understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A nut with internal and external teeth, characterized in that: include: The nut end is cylindrical and has an external thread on its outer end surface; The mounting hole is provided on one side of the nut end. The mounting hole is a hexagonal through hole, and an internal thread is provided on the inner end surface of the hole.

2. The internal and external thread nut according to claim 1, characterized in that: The external thread is opened along the outer wall surface from the opposite side of the nut end.

3. The internal and external thread nut according to claim 2, characterized in that: The internal thread is opened from the opposite side of the nut end, and the internal thread and the mounting hole are opened along the same center point.

4. The internal and external thread nut according to claim 3, characterized in that: The length of the external thread is shorter than the length of the internal thread.

5. The internal and external thread nut according to claim 4, characterized in that: The ratio of the length of the external thread to the length of the internal thread is .

6. The internal and external thread nut according to claim 5, characterized in that: The ratio of the tooth height of the external thread to the tooth height of the internal thread is 2.

7. The internal and external thread nut according to claim 6, characterized in that: The pitch of the external thread is equal to the pitch of the internal thread.

8. The internal and external thread nut according to claim 7, characterized in that: A transition angle is provided on the opposite side of the nut end, and the transition angle is greater than 50° and less than 60°.

9. The internal and external thread nut according to claim 6, characterized in that: The surface of the nut end is plated with zinc-nickel alloy, with a film thickness of ≥12 μm.

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