Threaded fastener based on cold deformation

Abstract

This invention discloses a cold-deformation-based threaded fastener, comprising component one and components four, three, and two sequentially mounted on the screw of component one. Component four is a collar structure with a variable diameter section and a deformation section; component three is a compression collar structure; component two is a nut structure; the outer edge of the contact end face of component three and component two has a stepped ring with a stepped groove structure, and the contact end face has a raised ring formed by a protrusion. In the combined state, the raised ring of component two and the stepped ring of component three are in clearance fit. In this invention, component three presses component four into the external thread of component one. The entire structure provides a stable preload force, unaffected by external factors, solving the problem of large preload fluctuations in traditional threaded fasteners. The combination structure of components two and three solves the problem of overly complex installation processes caused by too many components in engineering applications. During installation, component three does not rotate with component two, resulting in a more stable and reliable anti-loosening effect.

Description

Technical Field

[0001] This invention belongs to the field of riveting technology, specifically to the riveting category (B21J) and fastener category (F16B) in metal machining, and relates to a threaded fastener anti-loosening system based on cold deformation. Background Technology

[0002] Threaded fasteners are widely used in various fields and are a very important fastening method. However, they also have some shortcomings. For example, ordinary threaded fasteners have poor anti-loosening performance. Due to the gap between the threads of the bolt and nut, when subjected to lateral loads, the contact point between the threads will slip, causing the nut to come out along the helix, which will eventually reduce the bolt preload and loosen the connection.

[0003] Currently, there are anti-loosening technologies such as double-layer self-locking washers and lock nuts. These applications have improved the bolt loosening problem to some extent. However, these technologies all aim to prevent the nut from rotating relative to itself, which introduces another problem: increased installation torque. For bolts installed using the torque method, the final preload provided by the bolt is controlled by adjusting the torque. However, the above anti-loosening technologies cause changes in the bolt's torque coefficient, ultimately resulting in the original torque failing to provide the initially designed preload. Significant fluctuations in preload lead to potential safety hazards in the connection. Summary of the Invention

[0004] This invention discloses a threaded fastener based on cold deformation to address the shortcomings of existing technologies. The purpose of this invention is to combine annular groove riveting technology with threaded connection technology to provide a threaded fastening connection system that is easy to install, has controllable preload, and offers good anti-loosening performance.

[0005] This invention is achieved through the following technical solution:

[0006] A threaded fastener based on cold deformation, characterized by comprising the following components:

[0007] Component one is a screw structure, having an external thread arranged on the screw and a mechanism located at the other end of the screw for limiting the connecting parts;

[0008] Components four, three, and two are sequentially mounted on the screw of component one from the inner end to the outer end;

[0009] Component four is a collar structure with a central hole diameter less than or equal to the external thread diameter of the screw. The outer wall consists of, in sequence: a variable diameter section with a circular arc transition at the contact end with component three, and a deformation section that enables extrusion deformation.

[0010] Component three is an extrusion collar structure. The diameter of the central hole matches the outer diameter of component four to achieve extrusion deformation and fastening of component four. The end in contact with component four is provided with an extrusion arc surface section with a gradually changing diameter. The axial height of component three is greater than or equal to the axial height of the diameter changing section plus the deformation section of component four.

[0011] Component two is a nut structure with an internal thread that engages with the external thread of component one for tightening.

[0012] Furthermore, the outer edge of the contact end face of component three and component two is provided with a stepped ring with a stepped groove structure, and the contact end face of component two and component three is provided with a raised ring formed by a protrusion. In the combined state of component two and component three, the raised ring of component two and the stepped ring of component three are in clearance fit.

[0013] Furthermore, the vertical wall of the three-step ring is provided with a semi-circular stepped groove around the perimeter, and the vertical wall of the inner side of the two-step ring is provided with a semi-circular raised groove around the perimeter. The three-step ring and the two-step ring are engaged by the clamp of the ring structure through the stepped groove and the raised groove.

[0014] Furthermore, a flange with a diameter larger than that of the fourth deformation section of the component is also provided at the outer end of the component.

[0015] Furthermore, the mechanism on the other end of the screw used to limit the connecting member is a nail head with a diameter larger than that of the screw.

[0016] Furthermore, the outer diameter (d1) of the deformation section of component four that achieves extrusion deformation is greater than the diameter (d2) of the extrusion hole of component three. At the same time, the difference (d1-d2) between the outer diameter of the deformation section of component four that achieves extrusion deformation and the diameter of the extrusion hole of component three is less than or equal to the thread height.

[0017] The advantages of the threaded fasteners of this invention are:

[0018] Since the force of component three squeezing component four into the external thread of component one is constant, and the force of component three starting to squeeze and deform component four is also constant, the preload that the entire structure can provide is stable and will not be affected by other external factors, thus solving the problem of large fluctuations in preload of traditional threaded fasteners.

[0019] The combined structure of components two and three in this invention solves the problem of overly complex installation processes caused by too many components in engineering applications. If components two and three were designed as a single unit, component three would rotate along with component two during installation, increasing the installation torque and lacking practical engineering application value, while also significantly reducing the anti-loosening effect. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of a fastener component of the present invention;

[0021] Figure 2 This is a schematic diagram of two cross-sections of the fastener component of the present invention;

[0022] Figure 3 This is a schematic diagram of the two end faces of the fastener component of the present invention;

[0023] Figure 4 This is a schematic diagram of three cross-sections of the fastener component of the present invention;

[0024] Figure 5 This is a schematic diagram of the three end faces of the fastener component of the present invention;

[0025] Figure 6 This is a half-sectional schematic diagram of one structure of the fastener component of the present invention;

[0026] Figure 7 This is a half-sectional schematic diagram of another structure of the fastener component four of the present invention;

[0027] Figure 8 This is a schematic diagram of fastener component five of the present invention;

[0028] Figure 9 This is a schematic diagram of the five end faces of the fastener component of the present invention;

[0029] Figure 10 This is a half-sectional schematic diagram of the pre-tightened assembly state of the fastener of the present invention;

[0030] Figures 11 to 14 This is a cross-sectional schematic diagram of the fastening steps one to four of the present invention.

[0031] Figure 15 This is a schematic diagram of the force applied to a fastener fastening connection component of the present invention;

[0032] Figure 16 This is a schematic diagram of the force state of components 2, 3, and 4 in the fastener fastening connection state of the present invention;

[0033] Figure 17 This is a half-sectional schematic diagram of fastener components two, three, and five of the present invention;

[0034] Figure 18 This is a three-part enlarged schematic diagram of the fastener component of the present invention;

[0035] Figure 19 This is a partially enlarged schematic diagram of the fastener component two of the present invention.

[0036] In the diagram, 1 is component one, 2 is component two, 3 is component three, 4 is component four, 5 is clamp, 1.1 is external thread, 2.1 is internal thread, 2.2 is raised ring, 2.3 is raised groove, 3.1 is extruded arc surface, 3.2 is stepped ring, 3.3 is stepped groove, 4.1 is deformed section, 4.2 is flange, 4.3 is diameter changing section, h is total height, and H is inner hole height. Detailed Implementation

[0037] The present invention will be further described below with reference to specific embodiments. These specific embodiments are further explanations of the principles of the present invention and are not intended to limit the present invention in any way. Any technology that is the same as or similar to the present invention does not exceed the scope of protection of the present invention.

[0038] Refer to the attached diagram.

[0039] This invention provides a threaded fastener system with controllable preload and anti-loosening properties by combining ring groove riveting technology with threaded connection technology. The invention features convenient installation, controllable preload, and excellent anti-loosening performance.

[0040] The threaded fastener of the present invention consists of four parts: part one (1), part two (2), part three (3), and part four.

[0041] like Figure 1 The component shown, 1, includes an external thread 1.1; other structures are not limited to this. Figure 1 As shown in the figure.

[0042] like Figure 2 The component 2 shown includes an internal thread 2.1, and a raised ring 2.2 formed by a protrusion is provided on the end face of the contact end of component 2 and component 3.

[0043] like Figure 19 As shown, further, a raised groove 2.3 with a semi-circular cross-section is provided on the inner vertical wall of the raised ring 2.2 of component 2.

[0044] like Figure 4 As shown, component 3 is provided with an extruded arc surface 3.1, and the outer edge of the end face of component 3 in contact with component 2 is provided with a stepped ring 3.2 with a stepped groove structure.

[0045] like Figure 18 As shown, the vertical wall of component 3, step ring 3.2, is provided with a stepped groove 3.3 with a semi-circular cross-section that surrounds the entire ring.

[0046] When component 2 and component 3 are engaged, the protruding ring 2.2 of component 2 and the stepped ring 3.2 of component 3 are in clearance fit. Component 2 can drive component 3 around the stepped ring 3.2 of component 3 along the axial direction.

[0047] like Figure 17 As shown, the components 2 and 3 can also be combined by the ring clamp 5 embedded in the raised groove 2.3 and the stepped groove 3.3 of the combined state of the components 2 and 3. This structure can more stably combine the components 2 and 3 into an integrated structure that can rotate with each other, which is convenient for combination and configuration in use, and does not affect the torsional use in the fastening operation.

[0048] like Figure 6 , Figure 7 As shown, component 4 is a collar structure, with the diameter of the central hole being the same as the diameter of the external thread 1.1 of the screw. The outer wall consists of: a variable diameter section 4.3 with a circular arc transition at the contact end with component 3, and a deformation section 4.1 for extrusion deformation. Component 4 can also have a flange 4.2 further provided in the deformation section 4.1.

[0049] Compositional form such as Figure 10 As shown, the external thread 1.1 of component 1 matches the internal thread 2.1 of component 2, and component 2 and component 3 form a combined structure; they can also be combined into a rotatable integrated structure by clamp 5, such as... Figure 17 As shown, by inserting the circular clamp 5 into the ring formed by the groove structure of component 2 and component 3, component 2 and component 3 become a whole. This structure ensures that component 3 will not rotate with component 2 during the installation process, while it can move downward along the axis under the pressure of component 2, thus ensuring the integrity of component 2 and component 3.

[0050] The deformation section 4.1 of component 4 is the main functional structure for preventing loosening. The total height h of the variable diameter section 4.3 plus the deformation section 4.1 is less than or equal to H, where H is the total axial inner hole height of component 3. Component 4 can be a structure that does not include the flange 4.2.

[0051] like Figures 11 to 14 As shown, the installation method includes the following steps:

[0052] 1. For example Figure 11 As shown, insert component 1 through one end of the connecting plate;

[0053] 2. For example Figure 12 As shown, insert component 4 and component 3 from the other end of the connecting plate, and finally screw in component 2 until it contacts the end face of component 4.

[0054] 3. For example Figure 13 , 14As shown, a torque is applied to component 2, pushing component 3 to move downwards; when the pressure applied by component 2 to component 3 reaches a certain value F, component 3 continues to move downwards and begins to squeeze component 4, causing the internal metal of component 4 to flow into the external thread 1.1 of component 1. When the displacement of component 3 covers the variable diameter section 4.3 plus the deformed section 4.1 of component 4, the installation of the entire connection pair is completed.

[0055] like Figure 15 As shown, the riveting force F1 at which component 4 begins to deform is greater than or equal to half of the preload force P required by component 1. After installation, the metal on the inner wall of component 4 is squeezed into the external thread 1.1 of component 1 by component 3, causing the external thread 1.1 segment of component 1 corresponding to component 3 to elongate, generating a preload force P2. At the same time, the external thread 1.1 segment of component 1 corresponding to component 2 also elongates, generating a preload force P1. The final preload force P in the entire system is P = P2 + P1.

[0056] like Figure 16 As shown, during the process of component 3 pressing component 4, component 4 will elongate and exert a certain upward pressure on component 2. This pressure will also prevent the threaded connection from loosening and further avoid loosening.

Claims

1. A threaded fastener based on cold deformation, characterized in that... It consists of the following components: Component one is a screw structure, having an external thread arranged on the screw and a mechanism located at the other end of the screw for limiting the connecting parts; Components four, three, and two are sequentially mounted on the screw of component one from the inner end to the outer end; Component four is a collar structure with a central hole diameter less than or equal to the external thread diameter of the screw. The outer wall consists of, in sequence: a variable diameter section with a circular arc transition at the contact end with component three, and a deformation section that enables extrusion deformation. Component three is an extrusion collar structure. The diameter of the central hole matches the outer diameter of component four to achieve extrusion deformation and fastening of component four. The end in contact with component four is provided with an extrusion arc surface section with a gradually changing diameter. The axial height of component three is greater than or equal to the axial height of the diameter changing section plus the deformation section of component four. Component two is a nut structure with an internal thread that engages with the external thread of component one for tightening; The outer edge of the contact end face of component 3 and component 2 is provided with a stepped ring with a stepped groove structure, and the contact end face of component 2 and component 3 is provided with a raised ring formed by a protrusion. In the combined state of component 2 and component 3, the raised ring of component 2 and the stepped ring of component 3 are in clearance fit.

2. The threaded fastener based on cold deformation according to claim 1, characterized in that: The vertical wall of the three-step ring of component three is provided with a semi-circular stepped groove around the whole circle, and the vertical wall of the inner side of the raised ring of component two is provided with a semi-circular raised groove around the whole circle. When component three and component two are combined, they are engaged by the clamp of the ring structure through the stepped groove and the raised groove.

3. The threaded fastener based on cold deformation according to claim 1, characterized in that: The outer end of the fourth deformation section of the component is also provided with a flange with a diameter larger than that of the fourth deformation section of the component.

4. The threaded fastener based on cold deformation according to claim 1, characterized in that: The mechanism on one component, located at the other end of the screw, used to limit the connecting member, is a nail head with a diameter larger than that of the screw.

5. The threaded fastener based on cold deformation according to claim 1, characterized in that: The outer diameter (d1) of the deformation section of component four that achieves extrusion deformation is greater than the diameter (d2) of the extrusion hole of component three. At the same time, the difference (d1-d2) between the outer diameter of the deformation section of component four that achieves extrusion deformation and the diameter of the extrusion hole of component three is less than or equal to the thread height.

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