Threaded connection with high stability

Abstract

The utility model discloses a high stability's screw type connecting piece belongs to fastener field. The screw type connecting piece includes: the nut subassembly of setting on the connecting rod, and the nut subassembly includes: the first nut and first gasket of coaxial connection through buckle subassembly, the buckle subassembly includes: the convex positioning piece and the positioning recess, and the convex positioning piece is coaxially arranged in the positioning recess, and when the external force acts, the rotation between the convex positioning piece and the positioning recess happens. Eliminate the rotation friction between fastener and the contact surface of base when tightening the nut thoroughly, thereby fundamentally avoid the wear and tear to the soft base surface. Realize zero wear and tear: realize the part of contact with the base in the tightening process without rotation, ensure that the base surface is intact. Keep the pre-tightening force: while avoiding wear and tear, ensure that the assembly can exert and maintain the axial pre-tightening force equivalent to the standard nut or even better.

Description

Technical Field

[0001] This utility model relates to the field of fasteners, and in particular to a threaded connector with high stability. Background Technology

[0002] Currently, hexagonal flange nuts are widely used in mechanical assembly to connect and fasten components. These nuts integrate the flange and the nut body, reducing contact pressure through an increased flange contact surface and providing a certain degree of anti-loosening performance. However, existing hexagonal flange nuts have the following significant drawbacks and shortcomings:

[0003] Surface wear on the base material: During installation and tightening, when torque is applied to the nut, the nut body and the flange face rotate synchronously. Since nuts are typically made of high-strength, high-hardness materials (such as carbon steel or alloy steel, with a hardness of HRC 25-35), while the hardness of the connected base material (such as aluminum alloy housings, plastic supports, thin steel plates, or surface-treated components) is often much lower than that of the nut, the hard flange face acts like a scraper, scratching and abrading the softer base material contact surface, leading to damage to the base material surface.

[0004] Wear leads to a decline in connection performance: This wear will bring a series of negative effects: (1) Aesthetics are damaged, and unsightly scratches appear on the surface; (2) For connections with sealing requirements, damaged contact surfaces may lead to poor sealing; (3) Metal debris generated by wear may contaminate the surrounding environment or precision parts; (4) Most importantly, wear on the substrate surface will reduce the effective support area, and the actual contact pressure may exceed the design value, causing plastic deformation of the substrate, thus failing to obtain the stable and reliable axial preload required by the design, reducing the safety and reliability of the connection.

[0005] The root cause of the above problems lies in the fact that the rotational friction interface of a traditional one-piece flange nut is located between the nut flange and the base body, which have a significant difference in hardness. The circumferential motion generated by the tightening torque inevitably produces sliding friction at this interface, leading to wear of the soft base body.

[0006] In view of the above problems, the inventors of this application aim to solve the problem of substrate wear caused by relative rotational friction in the prior art. Utility Model Content

[0007] To solve the above-mentioned technical problems, this utility model provides a threaded connector with high stability.

[0008] The technical solution of this utility model is: a threaded connector with high stability, including a nut assembly disposed on a connecting rod, the nut assembly comprising:

[0009] First gasket;

[0010] The first nut and the first washer are coaxially connected by a snap-fit ​​assembly;

[0011] The buckle assembly includes a protruding positioning member and a positioning groove. The protruding positioning member is coaxially disposed in the positioning groove. When the protruding positioning member is disposed on the first nut, the positioning groove is disposed on the first washer. Or when the positioning groove is disposed on the first nut, the protruding positioning member is disposed on the first washer. When an external force is applied, the protruding positioning member and the positioning groove rotate.

[0012] Furthermore, there is a gap between the latching assembly and the threaded portion of the connecting rod. This prevents the latching assembly from interfering with the threaded portion of the connecting rod.

[0013] Furthermore, the first through hole of the first washer is larger than the diameter of the connecting rod. This is to prevent the first washer from affecting the connection of the connecting rod.

[0014] Furthermore, the inner wall of the first through hole of the first gasket is provided with a protruding positioning element or a positioning groove, and when the protruding positioning element is provided, there is a gap between the protruding positioning element and the connecting rod.

[0015] Furthermore, the protruding positioning member is arranged in a ring shape, and there is a gap between the inner wall of the ring and the connecting rod. This also avoids interference with the connection position.

[0016] Furthermore, the clamping part of the first nut is annularly arranged, and the middle part of the clamping part is provided with an internal thread that connects to the connecting rod. The end face of the clamping part is flat, and the clamping part is in contact with the first washer. The clamping part extends beyond the length of the protruding positioning member, so that the main body of the first nut and the first washer are directly clamped, which can improve the clamping effect.

[0017] Furthermore, in the central axis direction (or length direction) of the connecting rod, the size of the positioning groove is larger than the size of the protruding positioning member. This ensures that the first washer and the first nut have a certain range of motion in the length direction, allowing them to separate promptly in the unlocked and locked states, avoiding wear on the contact surfaces and thus affecting the connection effect.

[0018] Furthermore, the size of the positioning groove is 1-5mm larger than the size of the protruding positioning member. Ideally, this should be controlled within 2-3mm to provide cushioning and prevent shaking during transportation, which could affect the stability of the subsequent connection.

[0019] Furthermore, the connecting rod includes a head and a rod portion arranged sequentially, the rod portion comprising:

[0020] A connecting part, wherein the connecting part connects to the head, and the diameter of the connecting part is the maximum diameter of the rod;

[0021] A threaded portion is connected to a connecting portion, and the threaded portion is provided with a connecting thread, and the diameter of the threaded portion is smaller than that of the connecting portion.

[0022] Furthermore, the connecting rod is cold-forged.

[0023] Furthermore, the rod passes through at least two connecting bases.

[0024] Furthermore, a transition slope is provided between the joint and the threaded portion.

[0025] The beneficial technical effects of this utility model are: it completely eliminates rotational friction between the fastener and the substrate contact surface during nut tightening, thereby fundamentally avoiding wear on the softer substrate surface. It achieves zero wear: the parts in contact with the substrate do not rotate during tightening, ensuring the substrate surface remains intact. It maintains preload: while avoiding wear, it ensures the assembly can apply and maintain an axial preload equal to or even better than that of a standard nut. It provides anti-loosening performance: it retains or enhances the anti-loosening and anti-vibration performance of the original flange nut. It is easy to operate: the installation and tightening process is no different from that of an ordinary nut, requiring no additional operating steps. Through a clever "dynamic-static separation" design, it solves the long-standing technical problem of substrate wear with a simple structure and low cost, exhibiting superior comprehensive performance and outstanding substantial features and significant progress. Attached Figure Description

[0026] Figure 1 This is a connection diagram of an existing threaded connector.

[0027] Figure 2 This is a connection diagram of a threaded connector with high stability.

[0028] Figure 3 This is a schematic diagram of the combination of the first washer and the first nut.

[0029] Figure 4 yes Figure 3 A schematic diagram from another perspective.

[0030] Figure 5 This is a combined sectional view of the first washer and the first nut.

[0031] Figure 6 This is a cross-sectional view of the first gasket.

[0032] Figure 7 This is a cross-sectional view of the first nut.

[0033] in:

[0034] 1. Connecting rod; 11. Head; 12. Joint; 13. Threaded part; 14. Connecting thread; 15. Transition slope.

[0035] 2. First gasket; 21. First through hole;

[0036] 3. First nut; 31. Clamping part; 32. Internal thread.

[0037] 4. Protruding positioning element; 5. Positioning groove. Detailed Implementation

[0038] In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0039] See appendix Figure 1-7 The high-stability threaded connector shown includes a nut assembly disposed on the connecting rod 1, the nut assembly comprising:

[0040] First gasket 2;

[0041] The first nut 3 and the first washer 2 are coaxially connected by a snap-fit ​​assembly;

[0042] The buckle assembly includes a protruding positioning element 4 and a positioning groove 5. The protruding positioning element 4 is coaxially disposed in the positioning groove 5. When the protruding positioning element 4 is disposed on the first nut 3, the positioning groove 5 is disposed on the first washer 2. Or when the positioning groove 5 is disposed on the first nut 3, the protruding positioning element 4 is disposed on the first washer 2. When an external force is applied, the protruding positioning element 4 and the positioning groove 5 rotate.

[0043] Furthermore, there is a gap between the snap-fit ​​assembly and the threaded portion 13 of the connecting rod 1. This prevents the snap-fit ​​assembly from interfering with the threaded portion 13 of the connecting rod 1.

[0044] Furthermore, the first through hole 21 of the first washer 2 is larger than the diameter of the connecting rod 1. This is to prevent the first washer 2 from affecting the connection of the connecting rod 1.

[0045] Furthermore, the inner wall of the first through hole 21 of the first gasket 2 is provided with a protruding positioning element 4 or a positioning groove 5, and when the protruding positioning element 4 is provided, there is a gap between the protruding positioning element 4 and the connecting rod 1.

[0046] Furthermore, the protruding positioning element 4 is arranged in a ring shape, and there is a gap between the inner wall of the ring and the connecting rod 1. This also avoids interference with the connection position.

[0047] Furthermore, the clamping part 31 of the first nut 3 is arranged in a ring shape, and the middle part of the clamping part 31 is provided with an internal thread 32 that is threaded to the connecting rod 1. The end face of the clamping part 31 is flat, and the clamping part 31 is in contact with the first washer 2. The clamping part 31 extends beyond the length of the protruding positioning member 4, so that the main body of the first nut 3 and the first washer 2 are directly clamped, which can improve the clamping effect.

[0048] Furthermore, in the central axis direction (or length direction) of the connecting rod 1, the size of the positioning groove 5 is larger than the size of the protruding positioning member 4. This ensures that the first washer 2 and the first nut 3 have a certain range of motion in the length direction, and can separate in time during unlocking and locking, avoiding wear on the contact surface and thus affecting the connection effect.

[0049] Furthermore, the size of the positioning groove 5 is 1-5mm larger than the size of the protruding positioning part 4. Ideally, this should be controlled within 2-3mm to provide cushioning and prevent shaking during transportation, which could affect the stability of the subsequent connection.

[0050] Furthermore, the connecting rod 1 includes a head 11 and a rod portion arranged sequentially, the rod portion including:

[0051] The joint 12 connects to the head 11, and the diameter of the joint 12 is the maximum diameter of the rod.

[0052] The threaded portion 13 is connected to the connecting portion 12, and the threaded portion 13 is provided with a connecting thread 14, and the diameter of the threaded portion 13 is smaller than that of the connecting portion 12.

[0053] Furthermore, the connecting rod 1 is cold-forged.

[0054] Furthermore, the rod passes through at least two connecting bases.

[0055] Furthermore, a transition slope 15 is provided between the joint 12 and the threaded part 13.

[0056] Completely eliminates rotational friction between the fastener and the substrate contact surface during nut tightening, thus fundamentally avoiding wear on softer substrate surfaces. Achieves zero wear: Ensures no rotation of parts in contact with the substrate during tightening, guaranteeing the substrate surface remains intact. Maintains preload: While preventing wear, ensures the assembly can apply and maintain an axial preload equal to or even better than that of standard nuts. Anti-loosening performance: Retains or enhances the anti-loosening and anti-vibration performance of the original flange nut. Easy operation: The installation and tightening process is no different from that of ordinary nuts, requiring no additional operating steps. Through a clever "dynamic-static separation" design, it solves the long-standing technical problem of substrate wear with a simple structure and low cost, offering superior overall performance and possessing outstanding substantial features and significant progress.

[0057] The first nut is a modified hexagonal nut, shaped like a regular hexagonal prism for easy engagement with standard wrenches. Similar to a regular hexagonal nut, the first nut serves as the main body of the assembly, engaging with the bolt via its internal threads to convert the rotational tightening torque into axial preload.

[0058] The difference lies in the presence of a first washer at the end that contacts the base. This first washer is a separate, ring-shaped piece. Both the upper surface (the surface in contact with the nut body) and the lower surface (the surface in contact with the base) of the washer are smooth, flat planes. The washer diameter is larger than the major diameter of the bolt thread to ensure the bolt can pass freely without interfering with the washer. Its function is to provide a large, flat support surface on its lower surface to reduce contact pressure. Its core function is to remain stationary during tightening, preventing relative rotation with the base and thus protecting the base surface.

[0059] Static positional relationship: The upper surface of the washer is in contact with or has a small gap with the lower bearing surface of the nut body. The washer can rotate freely around the bolt axis.

[0060] Dynamic positional relationship and transmission relationship (tightening process):

[0061] Transmission relationship: When external torque is applied to the hexagonal surface of the nut body through a wrench, the torque drives the nut body to rotate and move along the bolt axis.

[0062] Dynamic Relationship: Due to the static friction between the gasket and the substrate contact surface, this friction prevents the gasket from rotating with the nut body. At this time, all relative rotational motion occurs between the lower bearing surface of the nut body and the upper surface of the gasket. This is an "internal sliding interface." The rotational motion of the nut body is converted into a pure axial clamping force on the gasket through the sliding friction between its lower end face and the upper surface of the gasket, and is ultimately transmitted to the substrate through the gasket.

[0063] The working process and principle of the entire product:

[0064] During installation, insert the assembled component (the nut body and washer are already snapped together) onto the bolt that has passed through the connecting hole. Tighten the hexagonal face of the nut body using a wrench. The nut body begins to rotate and descend, and its lower bearing surface begins to press against the upper surface of the washer. At this point, the washer in contact with the base tends to come to rest under the action of friction. The continued rotation of the nut body causes sliding friction at the contact interface between it and the washer. Since this interface is the contact between two high-hardness metal surfaces, the wear resistance is excellent, and wear is negligible.

[0065] The rotational motion of the nut body is completely isolated within this internal interface and cannot be transmitted to the interface between the washer and the substrate. Ultimately, when the nut is tightened to the correct position, a huge axial preload is applied evenly to the substrate surface through the stationary washer, while the substrate surface remains intact because it is protected from rotational scratching.

[0066] The most crucial effect is the complete elimination of wear on the substrate surface during tightening (wear rate is 0). By shifting the interface of rotational friction from "nut-substrate" to "nut-washer," soft or fragile substrate materials are protected, maintaining the integrity and aesthetics of the workpiece surface.

[0067] Improved Connection Reliability and Consistency: Traditional flange nuts, when tightened on soft substrates (such as aluminum alloy, HB 60-80), typically leave scratches of approximately 10-50 μm depth on the support surface, reducing the effective contact area by up to 30%. The components of this invention maintain 100% integrity of the substrate support surface, ensuring the designed contact area, thereby making the application of axial preload more accurate and stable, reducing preload dispersion by more than 20%. This avoids preload loss due to substrate wear and crushing, significantly improving the long-term reliability and fatigue resistance of the connection pair. Enhanced Sealing and Corrosion Resistance: The smooth, undamaged substrate surface provides better support for the sealing ring, improving the sealing effect. Simultaneously, the undamaged surface plating or coating enhances the corrosion resistance of the connection point. Preserved and Optimized Anti-Loosening Performance: Independent gaskets provide the same large support area as integrated flanges, with uniform pressure distribution, preserving anti-loosening performance. Under certain operating conditions, the greater static friction between the stationary gasket and the substrate may also provide additional anti-loosening effect. Versatility and economy: This component has a simple structure, mature manufacturing process, and limited cost increase. It can directly replace existing standard hexagonal flange nuts, and has high versatility and market application value.

[0068] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A threaded connector with high stability, characterized in that, Includes a nut assembly disposed on the connecting rod (1), the nut assembly comprising: First gasket (2); The first nut (3) and the first washer (2) are coaxially connected by a snap-fit ​​assembly; The buckle assembly includes a protruding positioning element (4) and a positioning groove (5). The protruding positioning element (4) is coaxially disposed in the positioning groove (5). When the protruding positioning element (4) is disposed on the first nut (3), the positioning groove (5) is disposed on the first washer (2). Or when the positioning groove (5) is disposed on the first nut (3), the protruding positioning element (4) is disposed on the first washer (2). When an external force is applied, the protruding positioning element (4) and the positioning groove (5) rotate.

2. The threaded connector with high stability according to claim 1, characterized in that: There is a gap between the buckle assembly and the threaded portion (13) of the connecting rod (1).

3. The threaded connector with high stability according to claim 1, characterized in that: The first through hole (21) of the first gasket (2) is larger than the diameter of the connecting rod (1). The inner wall of the first through hole (21) of the first gasket (2) is provided with a protruding positioning member (4) or a positioning groove (5). When the protruding positioning member (4) is provided, there is a gap between the protruding positioning member (4) and the connecting rod (1).

4. The threaded connector with high stability according to claim 3, characterized in that: The protruding positioning member (4) is arranged in a ring shape, and there is a gap between the inner wall of the ring and the connecting rod (1).

5. The threaded connector with high stability according to claim 1, characterized in that: The clamping part (31) of the first nut (3) is arranged in a ring shape, and the middle part of the clamping part (31) is provided with an internal thread (32) that is threadedly connected to the connecting rod (1). The end face of the clamping part (31) is arranged in a plane, and the clamping part (31) is in contact with the first washer (2).

6. The threaded connector with high stability according to claim 1, characterized in that: In the direction of the central axis of the connecting rod (1), the size of the positioning groove (5) is larger than the size of the protruding positioning member (4).

7. The threaded connector with high stability according to claim 6, characterized in that: The size of the positioning groove (5) is 1-5 mm larger than the size of the protruding positioning element (4).

8. The threaded connector with high stability according to claim 1, characterized in that: The connecting rod (1) includes a head (11) and a rod portion arranged sequentially, the rod portion comprising: A connecting part (12) is connected to the head (11), and the diameter of the connecting part (12) is the maximum diameter of the rod. A threaded portion (13) is connected to a connecting portion (12), and the threaded portion (13) is provided with a connecting thread (14).

9. The threaded connector with high stability according to claim 8, characterized in that: A transition slope (15) is provided between the joint (12) and the threaded part (13).

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