Fastener and fastening assembly

Abstract

The fastener comprises a wheel flange, the wheel flange is provided with a supporting face, a feeding groove and anti-rotation teeth, an opening of the feeding groove and the supporting face are arranged in the same horizontal direction, the feeding groove is connected with the supporting face and located on the inner side of the supporting face, the depth of the feeding groove is gradually increased from outside to inside, and the anti-rotation teeth are arranged in the feeding groove. Therefore, metal plate materials can be conveniently guided to flow into the feeding groove. The anti-rotation teeth extend from outside to inside and protrude out of the groove bottom of the feeding groove, and the top faces of the anti-rotation teeth and the supporting face are arranged in the same horizontal direction, so that the supporting area is increased, and the strength is improved. When the anti-rotation teeth or the supporting faces penetrate into the feeding groove and flow into the feeding groove, the metal plate materials abut against the side walls of the anti-rotation teeth to achieve the rotation stopping function, the contact area between the side walls of the inner sides of the anti-rotation teeth and the metal plate materials is larger, the anti-rotation effect is improved, the contact area between the side walls of the outer sides of the anti-rotation teeth and the metal plate materials is small, and therefore the anti-rotation effect is improved. And complete contact with a metal plate material is facilitated.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of connecting piece, concretely relates to a fastener and fastening assembly. BACKGROUND

[0002] Fastener technology is widely used, covering many aspects from household appliances to high-end manufacturing. The development of these technologies not only improves the quality and reliability of products, but also promotes the progress of related industries. With the continuous progress and innovation of technology, especially the rapid development of the automobile industry and the increasingly fierce market competition, higher requirements are put forward for the performance and connection application of automobile fasteners, especially the need to solve the problems of loosening and falling of traditional riveting parts, and the problems of low processing efficiency, high energy consumption and heavy pollution of traditional welding parts. In the prior art, riveting nuts are usually used to achieve connection. The anti-rotation teeth of the conventional riveting nut are usually uniform in height from the outside to the inside, and the sheet metal material is not easy to flow in during riveting. SUMMARY

[0003] The utility model aims at overcoming the above-mentioned defects or problems existing in the background art, and provides a fastener and fastening assembly.

[0004] To achieve the above-mentioned purpose, the utility model and its preferred embodiments adopt the following technical solutions, but the embodiments are not limited to the following solutions:

[0005] Scheme one, a fastener, comprising

[0006] The rim is provided with a support surface, a feeding groove and an anti-rotation tooth, the opening of the feeding groove is arranged at the same level as the support surface, and is connected with the support surface and located on the inner side of the support surface, and the depth of the feeding groove gradually increases from the outside to the inside; the anti-rotation tooth extends from the outside to the inside, protrudes from the groove bottom of the feeding groove, and the top surface of the anti-rotation tooth is arranged at the same level as the support surface.

[0007] Scheme two, based on scheme one, further comprising a convex navel, the convex navel protrudes from the groove bottom of the feeding groove and is higher than the support surface, and the convex navel is provided with a hole flanging.

[0008] Scheme three, based on scheme two, the support surface is located at the outer edge of the rim and is acute.

[0009] Scheme four, based on scheme two, the width of the anti-rotation tooth gradually decreases or gradually increases along the direction towards the groove bottom of the feeding groove.

[0010] Scheme five, based on scheme three or four, the width of the anti-rotation tooth gradually increases from the outside to the inside.

[0011] Sixth, based on the second to fourth schemes, the number of the anti-rotation teeth is several, and each of the anti-rotation teeth is arranged at intervals, so that the adjacent anti-rotation teeth and the feeding groove form an anti-rotation groove.

[0012] Seventh, based on the second scheme, the inner circumferential wall of the hole is composed of at least one inclined surface which is connected along the axial direction, so that the thickness of the convex belly gradually increases from the top end to the bottom end.

[0013] Eighth, based on the second scheme, further comprising an anti-rotation rib which protrudes from the bottom of the outer circumferential wall of the convex belly, and the anti-rotation rib has a gap with the groove bottom of the feeding groove.

[0014] Ninth, a fastening assembly comprising sheet metal and the fastener of any one of the second to eighth schemes, the sheet metal is provided with a through hole, the convex belly is adapted to pass through the through hole, and the sheet metal is located on the support surface and the top end of the anti-rotation tooth, the fastener is adapted to be riveted through the rivet head, so that the sheet metal enters the feeding groove, and the hole is adapted to be bent outward, so that the convex belly and the rim jointly hold the sheet metal.

[0015] Tenth, based on the ninth scheme, the sheet metal comprises a plate body and a tapered ring which is inclined to the plate body and protrudes from the plate body, the tapered ring faces the feeding groove, the tapered ring is provided with a recess and the through hole, the recess is communicated with the through hole, the convex belly is adapted to be placed in the recess after flanging, and the top surface of the convex belly does not protrude from the opening of the recess.

[0016] From the above description of the utility model and its preferred embodiments, compared with the prior art, the technical scheme of the utility model and its preferred embodiments have the following beneficial effects by using the following technical means:

[0017] 1. In the first scheme and its preferred embodiments, a fastener comprises a rim, the rim is provided with a support surface, a feeding groove and an anti-rotation tooth, the opening of the feeding groove is arranged at the same level as the support surface, is connected with the support surface, and is located on the inner side of the support surface, and the depth of the feeding groove gradually increases from the outside to the inside, so as to facilitate the sheet metal material to flow into the feeding groove. The anti-rotation tooth extends from the outside to the inside, protrudes from the groove bottom of the feeding groove, and the top surface of the anti-rotation tooth is arranged at the same level as the support surface, which can increase the support area and increase the strength compared with the anti-rotation tooth located in the feeding groove. When the sheet metal material flows into the feeding groove due to the penetration of the anti-rotation tooth or the support surface, the side wall of the anti-rotation tooth and the sheet metal material are in contact to achieve the function of rotation stopping. Since the depth of the feeding groove gradually increases from the outside to the inside, based on the anti-rotation tooth being arranged at the same level as the support surface, the contact area between the inner side wall of the anti-rotation tooth and the sheet metal material is larger, which increases the anti-rotation effect, and the contact area between the outer side wall of the anti-rotation tooth and the sheet metal material is small, which facilitates complete contact with the sheet metal material and increases the connection.

[0018] 2. In Scheme 2 and its preferred embodiments, the convex navel protrudes from the bottom of the feed groove and is higher than the support surface. The convex navel is provided with a flip hole so that the flip hole can be turned over by the action of the rivet head, so that the convex navel can squeeze the sheet metal and make the sheet metal material flow into the feed groove, and together with the support surface, anti-rotation teeth and the bottom of the feed groove, clamp the sheet metal to achieve fixation.

[0019] 3. In Scheme 3 and its preferred embodiments, the support surface is located on the outer edge of the wheel flange and has a sharp edge. This sharp edge shape of the support surface can reduce the contact area between the support surface and the sheet metal during the riveting process, increase the contact stress, make the sheet metal easier to deform, and make it easier for the support surface to fully fit with the sheet metal surface, thereby ensuring the stability of the riveting structure.

[0020] 4. In Scheme 4 and its preferred embodiments, the width of the anti-rotation teeth gradually decreases along the direction towards the bottom of the feed trough, which can improve the anti-detachment property. Conversely, the width of the anti-rotation teeth gradually increases along the direction towards the bottom of the feed trough, which facilitates the flow of sheet metal into the feed trough.

[0021] 5. In Scheme 5 and its preferred embodiments, the anti-rotation teeth gradually increase in width from the outside to the inside. During riveting, since the anti-rotation torque is mainly affected by the degree to which the outer anti-rotation teeth penetrate the sheet metal, the "narrow outer" structure is beneficial for the anti-rotation teeth to penetrate the sheet metal, increasing the anti-rotation torque. On the other hand, the "wide inner" structure increases the contact area between the fastener and the sheet metal, which can maximize the extrusion deformation of the sheet metal material and its flow inward, thereby preventing the sheet metal from coming out and improving the connection strength. Furthermore, since the width of the anti-rotation teeth gradually decreases along the direction towards the bottom of the feed groove, this structure can increase the pull-out force after riveting. Overall, in the extension direction of the anti-rotation teeth, a variable pressure design of external pressure reduction and internal pressure enhancement is realized to meet different application requirements.

[0022] 6. In Scheme Six and its preferred embodiments, the number of anti-rotation teeth is several, and the anti-rotation teeth are spaced apart so that adjacent anti-rotation teeth and the feed trough enclose an anti-rotation groove, thereby improving the anti-rotation effect. When the width of the anti-rotation teeth gradually decreases along the direction towards the bottom of the feed trough, the cross-section of the anti-rotation groove is a funnel-shaped structure with a narrow top and wide bottom. During the riveting process, the sheet metal is compressed and deformed, and the sheet metal material is squeezed into this concave anti-rotation groove. The sheet metal and the side wall of the groove interlock, preventing the fastener from rotating or slipping relative to the sheet metal. Moreover, there is no need to pre-set a retaining ring, and a stronger anti-pull-out effect is achieved with only a small structural change.

[0023] 7. In Scheme 7 and its preferred embodiments, the inner peripheral wall of the flanged hole is composed of at least one inclined surface connected along the axial direction, so that the thickness of the umbo gradually increases from the top to the bottom, presenting a "thin at the top and thick at the bottom" structural design. The thicker bottom end can ensure the strength of the umbo; the thinner top end is conducive to achieving flange or bending, thereby facilitating riveting.

[0024] 8. In Scheme 8 and its preferred embodiments, due to process limitations, the outer edge is usually subjected to greater deformation during riveting, and the inner sheet metal and the root of the protrusion cannot achieve effective deformation. Therefore, the root anti-rotation rib protrudes from the outer wall of the root of the protrusion and can be inserted into the sheet metal to play an anti-rotation role. In addition, the anti-rotation rib has a gap with the bottom of the feed groove, which also has the effect of preventing detachment.

[0025] 9. In Scheme 9 and its preferred embodiments, a fastening component includes sheet metal and the fasteners described above. The sheet metal is provided with a through hole, and a protrusion is adapted to pass through the through hole and place the sheet metal on the top of the support surface and the anti-rotation tooth. The fastener is adapted to be riveted by a rivet head so that the sheet metal enters the feed groove, and the flip hole is adapted to bend outward so that the protrusion and the rim together hold the sheet metal.

[0026] 10. In Scheme 10 and its preferred embodiments, the sheet metal includes a plate and a conical ring that is inclined relative to the plate and protrudes from the plate. The conical ring faces the feed groove so that the sheet metal can flow into the feed groove more easily. The conical ring is provided with a recess and a through hole. The recess and the through hole are connected. The protrusion is adapted to be placed in the recess after flanging, and the top surface of the protrusion does not protrude from the opening of the recess to prevent the sheet metal from connecting with other sheet metal. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a perspective view of the nut in Example 1;

[0029] Figure 2 This is a cross-sectional view of the anti-rotation teeth of the nut in Example 1. The width of the anti-rotation teeth gradually decreases along the direction towards the bottom of the feed groove.

[0030] Figure 3 This is a cross-sectional view of the nut in Example 1;

[0031] Figure 4 for Figure 3 Enlarged view of the marked area;

[0032] Figure 5 This is a schematic diagram of the bolt in Example 1;

[0033] Figure 6 This is a cross-sectional view of the anti-rotation teeth of the nut in Embodiment 1. The width of the anti-rotation teeth gradually increases along the direction towards the bottom of the feed groove.

[0034] Figure 7 This is a cross-sectional view of the sheet metal in Example 2;

[0035] Figure 8 This is a schematic diagram of the fastening components before riveting in Example 2;

[0036] Figure 9 This is a schematic diagram of the fastening components after riveting in Example 2.

[0037] Explanation of key figure labels:

[0038] 1. Flange; 11. Support surface; 12. Feed groove; 13. Anti-rotation tooth; 14. Anti-rotation groove; 2. Protruding navel; 21. Flanged hole; 211. Inclined surface; 22. Threaded hole; 3. Anti-rotation rib; 4. Sheet metal; 41. Plate body; 42. Conical ring; 43. Countersunk groove; 44. Through hole; Detailed Implementation

[0039] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are preferred embodiments of the present utility model and should not be considered as excluding other embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0040] Unless otherwise expressly defined, the use of terms such as "first," "second," or "third" in the claims, description, and drawings of this utility model is for distinguishing different objects and not for describing a specific order.

[0041] Unless otherwise expressly defined, in the claims, description, and accompanying drawings of this utility model, the use of directional terms such as "center," "lateral," "longitudinal," "horizontal," "vertical," "top," "bottom," "inner," "outer," "upper," "lower," "front," "rear," "left," "right," "clockwise," and "counterclockwise" to indicate orientation or positional relationships is based on the orientation and positional relationships shown in the accompanying drawings and is only for the convenience of describing this utility model and simplifying the description. It does not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the specific protection scope of this utility model.

[0042] Unless otherwise expressly defined, the terms "fixed connection" or "fixed connection" used in the claims, description and drawings of this utility model shall be interpreted broadly to refer to any connection in which there is no displacement or relative rotation relationship between the two parties, including non-removable fixed connection, detachable fixed connection, integral connection and fixed connection through other devices or components.

[0043] In the claims, description and accompanying drawings of this utility model, the terms "comprising," "having," and variations thereof are used to mean "including but not limited to."

[0044] A fastener includes a flange 1, a vent 2, and an anti-rotation rib 3. In this embodiment, the fastener is an M6 nut; in other embodiments, it can also be a bolt.

[0045] In this embodiment, the outer contour of the rim 1 is circular with a diameter of 12-18mm; in other embodiments, the outer contour of the rim 1 may also adopt a square structure, a hexagonal structure, an octagonal structure, or a stepped combination of the above shapes. The rim 1 is provided with a support surface 11, a feed groove 12, and anti-rotation teeth 13.

[0046] A support surface 11 is provided at the outer edge of the upper surface of the rim 1. The support surface 11 is approximately annular and surrounds the central axis of the rim 1. After riveting, this support surface 11 is completely fitted to the sheet metal 4. Preferably, the support surface 11 has a sharp edge (which can be achieved through a forming process). This sharp-edge support surface 11 reduces the contact area between the support surface 11 and the sheet metal 4 during riveting, increases the contact stress, makes the sheet metal 4 easier to deform, and facilitates a complete fit between the support surface 11 and the sheet metal 4, thereby ensuring the stability of the riveting structure. The sharpness of the support surface 11 is 0.2-0.4.

[0047] The opening of the feed trough 12 is set at the same level as the support surface 11, and is located inside the support surface 11 and connected to the support surface 11. The depth of the feed trough 12 gradually increases from the outside to the inside and extends to the navel 2. Its shape is roughly a boss.

[0048] The anti-rotation tooth 13 extends from the outside to the inside, protruding from the bottom of the feed groove 12. The top surface of the anti-rotation tooth 13 is set at the same level as the support surface 11, so as to support the sheet metal 4 together with the support surface 11. The height of the anti-rotation tooth 13 is 0.3-0.5mm.

[0049] The width of the anti-rotation teeth 13 gradually decreases or gradually increases along the direction towards the bottom of the feed groove 12. The gradual decrease in width along the direction towards the bottom of the feed groove 12 improves anti-detachment properties. Conversely, the gradual increase in width along the direction towards the bottom of the feed groove 12 facilitates the flow of the sheet metal 4 into the feed groove 12. In this embodiment, the width of the anti-rotation teeth 13 gradually decreases along the direction towards the bottom of the feed groove 12.

[0050] The anti-rotation teeth 13 are numerous, each arranged around the central axis of the rim 1 and spaced apart, radially distributed from the center outwards. This allows adjacent anti-rotation teeth 13 to enclose the feed groove 12, forming an anti-rotation groove 14. Since the width of the anti-rotation teeth 13 gradually decreases towards the bottom of the feed groove 12, the anti-rotation groove 14 has a funnel-shaped, narrow-at-the-top and wide-at-the-bottom cross-section. During riveting, the sheet metal 4 yields and deforms under pressure, and the sheet metal 4 material is squeezed into this concave anti-rotation groove 14. The sheet metal 4 interlocks with the sidewall of the groove, preventing the nut from rotating or slipping relative to the sheet metal 4. Furthermore, no pre-set retaining ring is required, achieving a stronger anti-pull-out effect with minimal structural changes. In this embodiment, the depth (circumferential) of the anti-rotation groove 14 is 0.1-0.4 mm.

[0051] Preferably, each anti-rotation tooth 13 gradually increases in width from the outside to the inside, exhibiting a narrower outer and wider inner shape. During riveting, since the anti-rotation torque is mainly affected by the degree to which the outer anti-rotation tooth 13 penetrates the sheet metal 4, the "narrower outer" structure facilitates the penetration of the anti-rotation tooth 13 into the sheet metal 4, increasing the anti-rotation torque. On the other hand, the "wider inner" structure increases the contact area between the nut and the sheet metal 4, maximizing the compression deformation of the sheet metal 4 material and its inward flow, thereby preventing the sheet metal 4 from coming out, increasing the pull-out force after riveting, and improving the connection strength. Overall, in the extension direction of the anti-rotation tooth 13, a variable pressure design of external pressure reduction and internal pressure enhancement is achieved to meet different application requirements.

[0052] In this embodiment, the convex navel 2 is coaxial with the central axis of the rim 1. The main function of the convex navel 2 is to flip the edge during riveting to fasten the sheet metal 4, thereby generating a resisting force (i.e., pull-out force) against pull-out. The convex navel 2 has a diameter of 8-10 mm and a height of 1 mm-4 mm. The convex navel 2 protrudes from the bottom of the feed groove 12 and is higher than the support surface 11. The convex navel 2 is provided with a flip hole 21 and a threaded hole 22, which are interconnected. In this embodiment, the flip hole 21 and the threaded hole 22 are coaxially arranged with the central axis of the rim 1. In other embodiments, of course, they can also be eccentrically arranged. For example, when the outer wall of the rim 1 plays a positioning or limiting function, the threaded hole 22 can be eccentrically arranged with the rim 1.

[0053] Preferably, the inner peripheral wall of the flange 21 is formed by at least one axially connected inclined surface 211, so that the thickness of the convex navel 2 gradually increases from the top to the bottom. Taking a nut as an example, in order to insert the anti-rotation tooth 13 or anti-rotation rib 3 into the sheet metal 4, it is usually necessary to apply a large pressure to compress the convex navel 2. During the flange process, the bent part of the convex navel 2 becomes very thin after being compressed, making it easy to break, resulting in a weak tensile strength between the rivet nut and the sheet metal 4. Therefore, the wall thickness of the convex navel 2 gradually increases from its top to its bottom, forming a "thin at the top, thick at the bottom" structural design. The thicker bottom end can ensure the strength of the convex navel 2; the thinner top end is conducive to flange or bending, thus facilitating riveting.

[0054] The anti-rotation rib 3 protrudes from the bottom of the outer peripheral wall of the umbilicus 2 and has several ribs. The anti-rotation rib 3 is located between adjacent anti-rotation teeth 13. Due to the flange riveting process used for the nut, the outer edge usually deforms more under stress during the riveting process due to process limitations. The inner sheet metal 4 and the root of the protrusion cannot achieve effective deformation. Therefore, the root anti-rotation rib 3 protrudes from the outer wall of the root of the umbilicus 2 and can penetrate into the sheet metal 4 to play an anti-rotation role. The anti-rotation rib 3 has a gap with the bottom of the feed groove 12, which also has an anti-detachment effect.

[0055] This nut offers high connection stability, low cost, and applicability to connecting plates of different materials and thicknesses (strong versatility and applicability). It overcomes the problems of existing riveting nuts, such as complex structure, high processing difficulty and cost (e.g., existing nuts require retaining rings to prevent loosening, but processing these rings requires additional technology, leading to high processing difficulty and cost) and low connection strength (e.g., the corresponding riveting sheet metal requires the use of riveting bolts or nuts to process countersunk grooves; due to material hardening, the nut cannot be fully embedded, posing a risk of loosening. Moreover, due to the large deformation of the material, the part material cannot flow smoothly during the riveting process and cannot be squeezed into the feed groove, resulting in an insufficiently tight connection between the riveting nut and the part).

[0056] Compared with the prior art, this embodiment has the following beneficial effects:

[0057] A fastener includes a rim 1, which has a support surface 11, a feed groove 12, and anti-rotation teeth 13. The opening of the feed groove 12 is horizontally aligned with and connected to the support surface 11, and is located inside the support surface 11. The feed groove 12 gradually increases in depth from the outside to the inside, thereby facilitating the flow of sheet metal material into the feed groove 12. The anti-rotation teeth 13 extend from the outside to the inside, protruding from the bottom of the feed groove 12. The top surface of the anti-rotation teeth 13 is horizontally aligned with the support surface 11. Compared to other fasteners, the anti-rotation teeth 13, located inside the feed groove 12, increase the area of ​​the support surface 11, thereby increasing strength. When the sheet metal 4 material flows into the feed trough 12 due to the insertion of the anti-rotation teeth 13 or the support surface 11, it abuts against the side wall of the anti-rotation teeth 13 to achieve the function of preventing rotation. Since the depth of the feed trough 12 gradually increases from the outside to the inside, the inner side wall of the anti-rotation teeth 13 has a larger contact area with the sheet metal 4 material because the top surface of the anti-rotation teeth 13 is set at the same level as the support surface 11, which can increase the anti-rotation effect. The outer side wall of the anti-rotation teeth has a smaller contact area with the sheet metal material, which facilitates complete contact with the sheet metal material and increases the connection.

[0058] In one exemplary embodiment, the convex navel 2 protrudes from the bottom of the feed groove 12 and is higher than the support surface 11. The convex navel 2 is provided with a flip hole 21 so that the flip hole 21 can be flipped under the action of the rivet head, so that the convex navel 2 can squeeze the sheet metal 4 so that the sheet metal 4 material flows into the feed groove 12 and is clamped together with the support surface 11, the anti-rotation tooth 13 and the bottom of the feed groove 12 to achieve fixation.

[0059] In one exemplary embodiment, the support surface 11 is located on the outer edge of the rim 1 and has a sharp edge. The feed groove 12 is connected to the support surface 11 so that the support surface 11 with this sharp edge shape can reduce the contact area between the support surface 11 and the sheet metal 4 during the riveting process, increase the contact stress, make the sheet metal 4 easier to deform, and make it easier for the support surface 11 to fully fit with the sheet metal 4, thereby ensuring the stability of the riveting structure.

[0060] In one exemplary embodiment, the width of the anti-rotation tooth 13 gradually decreases along the direction towards the bottom of the feed groove 12, which can improve the anti-detachment property. Conversely, the width of the anti-rotation tooth 13 gradually increases along the direction towards the bottom of the feed groove 12, which facilitates the flow of the sheet metal 4 into the feed groove 12.

[0061] In one exemplary embodiment, the anti-rotation teeth 13 gradually increase in width from the outside to the inside. During riveting, since the anti-rotation torque is mainly affected by the degree to which the outer anti-rotation teeth 13 penetrate the sheet metal 4, the "narrow outer" structure is beneficial for the anti-rotation teeth 13 to penetrate the sheet metal 4, increasing the anti-rotation torque. On the other hand, the "wide inner" structure increases the contact area between the fastener and the sheet metal 4, which can maximize the extrusion deformation of the sheet metal 4 material and allow it to flow inward, thereby preventing the sheet metal 4 from coming out and improving the connection strength. Furthermore, since the width of the anti-rotation teeth 13 gradually decreases along the direction towards the bottom of the feed groove 12, this structure can increase the pull-out force after riveting. Overall, in the extension direction of the anti-rotation teeth 13, a variable pressure design of external pressure reduction and internal pressure enhancement is realized to meet different application requirements.

[0062] In one exemplary embodiment, the number of anti-rotation teeth 13 is several, and the anti-rotation teeth 13 are spaced apart so that adjacent anti-rotation teeth 13 and the feed groove 12 enclose each other to form an anti-rotation groove 14, thereby improving the anti-rotation effect. When the width of the anti-rotation teeth 13 gradually decreases along the direction towards the bottom of the feed groove 12, the cross-section of the anti-rotation groove 14 is a funnel-shaped structure with a narrow top and wide bottom. During the riveting process, the sheet metal 4 yields and deforms under the compressive force, and the sheet metal 4 material is squeezed into this concave anti-rotation groove 14. The sheet metal 4 and the side wall of the groove interlock, preventing the fastener from rotating or slipping relative to the sheet metal 4. Moreover, there is no need to pre-set a retaining ring, and only a small structural change is needed to achieve a stronger anti-pull-out effect.

[0063] In one exemplary embodiment, the inner peripheral wall of the flange 21 is composed of at least one inclined surface 211 connected along the axial direction, so that the thickness of the convex navel 2 gradually increases from the top end to the bottom end, presenting a "thin at the top end and thick at the bottom end" structural design. The thicker bottom end can ensure the strength of the convex navel 2; the thinner top end is conducive to achieving flange or bending, thereby facilitating riveting.

[0064] In one exemplary embodiment, due to process limitations, the outer edge is usually subjected to greater deformation during riveting, and the inner sheet metal 4 and the protruding root cannot achieve effective deformation. Therefore, the root anti-rotation rib 3 protrudes from the outer wall of the root of the protrusion umbilicus 2 and can be inserted into the sheet metal 4 to play an anti-rotation role. In addition, the anti-rotation rib 3 has a gap with the bottom of the feed groove 12, which also has an anti-detachment effect.

[0065] Example 2

[0066] A fastening assembly includes a sheet metal 4 and the aforementioned fasteners. The sheet metal 4 includes a plate 41 and a conical ring 42 that is inclined relative to the plate 41 and protrudes from the plate 41. The conical ring 42 faces the feed groove 12. The conical ring 42 is provided with a recess 43 and a through hole 44. The recess 43 communicates with the through hole 44. A protruding navel 2 is adapted to be placed into the recess 43 after being flanged, and the top surface of the protruding navel 2 does not protrude from the opening of the recess 43.

[0067] The convex navel 2 is adapted to pass through the through hole 44 and place the sheet metal 4 on the top of the support surface 11 and the anti-rotation tooth 13. The fastener is adapted to allow the sheet metal 4 to enter the feed groove 12 after riveting, and the flip hole 21 is adapted to bend outward so that the convex navel 2 and the wheel rim 1 together hold the sheet metal 4.

[0068] Specifically, during the riveting process, the convex navel 2, under the pressure of the rivet head, yields and deforms until it bends and latches onto the sheet metal 4. Simultaneously, the rivet head and the bent convex navel 2 compress and deform the sheet metal 4. The tops of the support surface 11 and the anti-rotation teeth 13 adhere tightly to the sheet metal 4, providing support. The multi-functional anti-rotation teeth 13, with their narrow outer edges, pierce into the sheet metal 4. At the same time, the sheet metal 4 material is also squeezed into the concave anti-rotation groove 14, which has a funnel-shaped opening. The concave anti-rotation groove 14 has a funnel-shaped opening structure with a narrow top and wide bottom in both the circumferential and axial directions. During the riveting process, the sheet metal 4 yields and deforms under the compressive force, and the sheet metal 4 material is squeezed into this concave anti-rotation groove 14. Within this groove, the sheet metal 4 and the sidewall of the groove interlock, preventing the nut from rotating relative to the sheet metal 4 and slipping out. Furthermore, no pre-set retaining ring is required; only minor structural changes are needed to achieve a stronger anti-pull-out effect.

[0069] Furthermore, the thicker wall at the root of the convex navel 2 ensures its strength, while the thinner tip facilitates flanging or bending, thus aiding in riveting. On the other hand, the multi-functional anti-rotation teeth 13 with an "inner width" structure maximize the inward flow of the sheet metal 4 material during extrusion deformation. Together with the anti-rotation ribs 3 circumferentially arranged on the outer wall at the root of the convex navel 2, they compress and fasten the sheet metal 4, preventing rotation. This prevents the sheet metal 4 from coming off, increases the pull-out force after riveting, and improves the connection strength.

[0070] Finally, the flange of the convex navel 2 is completed and fastened to the sheet metal 4. The support surface 11, the bottom of the feed groove 12, and the top of the anti-rotation tooth 13 support the sheet metal 4, providing stable circumferential support. The flange of the convex navel 2 and the concave anti-rotation groove 14 can ensure that the nut does not detach from the sheet metal 4 under a certain axial load; the interlocking structure formed by the concave anti-rotation groove 14, the multi-functional anti-rotation tooth 13, and the sheet metal 4 can ensure that the nut does not rotate relative to the sheet metal 4 under a large torque. Similarly, this method is also applicable to press-fit bolts.

[0071] Compared with the prior art, this embodiment has the following beneficial effects:

[0072] In one exemplary embodiment, a fastening assembly includes a sheet metal 4 and the fasteners described above. The sheet metal 4 is provided with a through hole 44, and a protrusion 2 is adapted to pass through the through hole 44 and to allow the sheet metal 4 to sit on the top of the support surface 11 and the anti-rotation tooth 13. The fasteners are adapted to be riveted by a rivet head so that the sheet metal 4 enters the feed groove 12, and the flip hole 21 is adapted to bend outward so that the protrusion 2 and the rim 1 together fasten the sheet metal 4.

[0073] In one exemplary embodiment, the sheet metal 4 includes a plate 41 and a conical ring 42 that is inclined relative to the plate 41 and protrudes from the plate 41. The conical ring 42 faces the feed groove 12 so that the sheet metal 4 can flow more easily into the feed groove 12. The conical ring 42 is provided with a recess 43 and a through hole 44. The recess 43 communicates with the through hole 44. The protruding navel 2 is adapted to be placed in the recess 43 after flanging, and the top surface of the protruding navel 2 does not protrude from the opening of the recess 43 to prevent the sheet metal 4 from being connected to other sheet metal 4.

[0074] The foregoing description of the specifications and embodiments is intended to explain the scope of protection of this utility model, but does not constitute a limitation on the scope of protection of this utility model. Modifications, equivalent substitutions, or other improvements to the embodiments of this utility model or a portion thereof that can be obtained by those skilled in the art through logical analysis, reasoning, or limited experimentation, based on the teachings of this utility model or the foregoing embodiments, should all be included within the scope of protection of this utility model.

Claims

1. A fastener, characterized in that: include The rim (1) is provided with a support surface (11), a feed groove (12) and an anti-rotation tooth (13). The opening of the feed groove (12) is set at the same level as the support surface (11) and is connected to the support surface (11), and is located inside the support surface (11). The depth of the feed groove (12) gradually increases from the outside to the inside. The anti-rotation tooth (13) extends from the outside to the inside and protrudes from the bottom of the feed groove (12). The top surface of the anti-rotation tooth (13) is set at the same level as the support surface (11).

2. The fastener as described in claim 1, characterized in that: It also includes a protruding navel (2), which protrudes from the bottom of the feed trough (12) and is higher than the support surface (11). The protruding navel (2) is provided with a flip hole (21).

3. A fastener as described in claim 2, characterized in that: The support surface (11) is located on the outer edge of the rim (1) and has a sharp edge.

4. A fastener as described in claim 2, characterized in that: The width of the anti-rotation tooth (13) gradually decreases or gradually increases along the direction toward the bottom of the feed trough (12).

5. A fastener as described in claim 3 or 4, characterized in that: The anti-rotation tooth (13) gradually increases in width from the outside to the inside.

6. A fastener as described in any one of claims 2-4, characterized in that: The number of anti-rotation teeth (13) is several, and each anti-rotation tooth (13) is spaced apart so that adjacent anti-rotation teeth (13) and the feed trough (12) enclose each other to form an anti-rotation trough (14).

7. A fastener as described in claim 2, characterized in that: The inner peripheral wall of the convex hole (21) is composed of at least one section of inclined surface (211) connected along the axial direction, so that the thickness of the convex navel (2) gradually increases from the top to the bottom.

8. A fastener as described in claim 2, characterized in that: It also includes an anti-rotation rib (3), which protrudes from the bottom of the outer peripheral wall of the umbilicus (2), and the anti-rotation rib (3) has a gap with the bottom of the feed trough (12).

9. A fastening assembly, characterized in that: The fastener includes sheet metal (4) and a fastener as described in any one of claims 2-8, wherein the sheet metal (4) is provided with a through hole (44), the umbo (2) is adapted to pass through the through hole (44) and to place the sheet metal (4) on the top of the support surface (11) and the anti-rotation tooth (13), the fastener is adapted to be riveted by a rivet head so that the sheet metal (4) enters the feed groove (12), and the flip hole (21) is adapted to bend outward so that the umbo (2) and the rim (1) together hold the sheet metal (4).

10. A fastening assembly as described in claim 9, characterized in that: The sheet metal (4) includes a plate (41) and a conical ring (42) that is inclined relative to the plate (41) and protrudes from the plate (41). The conical ring (42) faces the feed groove (12). The conical ring (42) is provided with a recess (43) and the through hole (44). The recess (43) communicates with the through hole (44). The convex navel (2) is adapted to be placed in the recess (43) after flanging, and the top surface of the convex navel (2) does not protrude from the opening of the recess (43).

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