Connecting bolt and composite material connecting assembly

Abstract

The utility model discloses a connecting bolt and a composite material connecting assembly, the connecting bolt comprises a screw rod, a sleeve and a nut, the periphery of one end of the screw rod is provided with a thread part, the periphery of the other end of the screw rod is provided with a supporting part, and the outer diameter of the supporting part is larger than that of the screw rod; the sleeve sleeves the screw rod, the inner diameter of the sleeve is smaller than the outer diameter of the supporting part, a clamping part protruding outwards is arranged on the outer side wall of the sleeve, and an opening in one end of the sleeve is a flaring; the nut is connected to the threaded part, the nut is used for driving the screw rod to move axially, so that the supporting part moves into the sleeve from the flaring, then the sleeve is expanded, the clamping part is clamped in a connecting hole of a to-be-connected piece, and the supporting part can smoothly move into the sleeve conveniently by forming the flaring in one end of the sleeve. Compared with the mode that a threaded insert is arranged in a connecting hole of the to-be-connected piece in advance, the connecting convenience can be effectively improved, and the connecting stability of the bolt can be guaranteed through the clamping part.

Description

Technical Field

[0001] This utility model relates to the field of fastener technology, and in particular to a connecting bolt and a composite material connecting assembly. Background Technology

[0002] Carbon fiber composite materials are generally connected by riveting or bonding. Riveting is generally suitable for thin composite parts, but the riveting effect is poor for thick composite parts.

[0003] When connecting thick composite materials to metal or other composite materials, it is often necessary to embed threaded inserts, pre-embed metal blocks, or use adhesive bonding bolts for fixing. However, all of these connection methods increase the difficulty of the process and the construction cost.

[0004] Therefore, how to provide a connecting bolt that is easy to connect and has good connection stability is a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0005] One objective of this invention is to provide a connecting bolt that can effectively improve the convenience of operation and the stability of the connection. Another objective is to provide a composite material connecting assembly including the aforementioned connecting bolt.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A connecting bolt, comprising:

[0008] A screw, wherein one end of the screw has a threaded portion on its outer periphery and the other end has a support portion on its outer periphery, the outer diameter of the support portion being larger than the outer diameter of the screw;

[0009] A sleeve is fitted onto the screw, the inner diameter of the sleeve is smaller than the outer diameter of the support, the outer side wall of the sleeve is provided with an outwardly protruding snap-fit ​​portion, and the opening at one end of the sleeve is a flared opening.

[0010] A nut, threadedly connected to the threaded portion, is used to drive the screw to move axially when tightened, so that the support portion moves from the flared end into the sleeve and expands the sleeve.

[0011] In some embodiments, the sidewall of the sleeve is provided with at least one clearance groove for the sleeve to be pushed outward.

[0012] In some embodiments, the clearance groove extends along the axial direction of the sleeve, and multiple clearance grooves are evenly distributed along the circumferential direction of the sleeve.

[0013] In some embodiments, the support portion is a cylindrical portion.

[0014] In some embodiments, the cylindrical portion has a transition portion at one end facing the threaded portion, and the outer diameter of the transition portion gradually decreases from the cylindrical portion to the threaded portion.

[0015] In some embodiments, the outer surface of the transition portion is adapted to the inner surface of the flared opening.

[0016] In some embodiments, the sleeve has a flange on the outer periphery of the end facing the nut.

[0017] In some embodiments, the snap-fit ​​portion is a barb integrally formed on the outer wall of the sleeve.

[0018] In some embodiments, the outer wall of the sleeve is provided with a plurality of snap-fit ​​portions distributed along the circumferential direction and / or the axial direction.

[0019] A composite material connecting assembly includes the connecting bolts described in any of the above claims, and further includes a composite material plate and a connected component. The composite material plate has a first connecting hole, and the connected component has a second connecting hole. The support portion and the sleeve are located inside the first connecting hole, and the threaded portion extends out of the second connecting hole. The support portion is used to open the sleeve under the tightening action of the nut, so that the snap-fit ​​portion snaps onto the inner wall of the first connecting hole.

[0020] Compared with existing technologies, the above technical solution has the following advantages:

[0021] This utility model provides a connecting bolt comprising: a screw, a sleeve, and a nut. One end of the screw has a threaded portion on its outer periphery, and the other end has a support portion on its outer periphery, the outer diameter of which is larger than the outer diameter of the screw. The sleeve is fitted onto the screw, its inner diameter being smaller than the outer diameter of the support portion. The outer wall of the sleeve has an outwardly protruding snap-fit ​​portion, and one end of the sleeve has a flared opening. The nut is threaded onto the threaded portion and is used to drive the screw to move axially, allowing the support portion to move from the flared opening into the sleeve. Because the inner diameter of the sleeve is smaller than the outer diameter of the support portion, after the support portion moves into the sleeve, it expands outward, thus opening the sleeve so that the snap-fit ​​portion engages with the connecting hole of the component to be connected. The flared opening at one end of the sleeve facilitates smooth movement of the support portion into the sleeve. Compared to pre-installing a threaded insert in the connecting hole of the component to be connected, this design effectively improves the ease of connection, and the snap-fit ​​portion ensures the stability of the bolt connection.

[0022] The composite material connecting assembly provided by this utility model has corresponding advantages because it includes the aforementioned connecting bolts. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0024] Figure 1 A three-dimensional structural diagram of a connecting bolt provided for a specific embodiment of this utility model;

[0025] Figure 2 This is a schematic diagram of the structure of a composite material connection assembly provided in a specific embodiment of the present invention;

[0026] Figure 3 for Figure 2 A cross-sectional structural diagram.

[0027] The attached figures are labeled as follows:

[0028] 10-Screw, 11-Threaded part, 12-Support part, 13-Transition part;

[0029] 20-Sleeve, 21-Snap-fit ​​part, 22-Allowing groove, 23-Flange, 24-Flange;

[0030] 30-nut;

[0031] 100 - Composite material plates;

[0032] 200 - Connected component. Detailed Implementation

[0033] 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 only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0034] Please refer to Figures 1 to 3 , Figure 1 A three-dimensional structural diagram of a connecting bolt provided for a specific embodiment of this utility model; Figure 2 This is a schematic diagram of the structure of a composite material connection assembly provided in a specific embodiment of the present invention; Figure 3 for Figure 2 A cross-sectional structural diagram.

[0035] This utility model provides a connecting bolt comprising: a screw 10, a sleeve 20, and a nut 30. One end of the screw 10 has a threaded portion 11 on its outer periphery, and the other end has a support portion 12 on its outer periphery. The outer diameter of the support portion 12 is larger than the outer diameter of the screw 10. The sleeve 20 is fitted onto the screw 10, wherein the inner diameter of the sleeve 20 is smaller than the outer diameter of the support portion 12. The outer wall of the sleeve 20 has an outwardly protruding snap-fit ​​portion 21, and the opening at one end of the sleeve 20 is flared. Figure 1 As shown, the inner diameter of the flared opening gradually decreases from bottom to top along the axial direction of the screw 10. For example, the flared opening can be a bell mouth 24 or a tapered mouth; the nut 30 is threaded to the threaded part 11, and before the connecting bolt is connected to the connecting part that needs to be fixed, the sleeve 20 is located between the support part 12 and the nut 30. In use, for example, when fixing the first and second plates, the support 12 and sleeve 20 are placed in the connecting hole of the first plate, with the threaded part 11 protruding from the second plate. Then, the nut 30 is tightened until it contacts the second plate. As the nut 30 is tightened further, it will not move axially. This will cause the screw 10 to move axially, allowing the support 12 to move from the flared end into the sleeve 20. Since the outer diameter of the support 12 is larger than the inner diameter of the sleeve 20, after the support 12 moves into the sleeve 20, it will expand the sleeve 20 outward, thus opening the sleeve 20. This allows the snap-fit ​​part 21 on the outer wall of the sleeve 20 to snap into the connecting hole of the first plate. The flared end of the sleeve 20 facilitates the smooth movement of the support 12 into the sleeve 20. Compared to pre-installing a threaded insert in the connecting hole of the first plate, this effectively improves the ease of connection, and the snap-fit ​​part 21 ensures the stability of the bolt connection.

[0036] In some embodiments, such as Figure 1 As shown, the side wall of the sleeve 20 is provided with at least one relief groove 22 for the sleeve 20 to expand outward. The purpose of the relief groove 22 is to allow the sleeve 20 to expand. The relief groove 22 is an open groove, with the end of the relief groove 22 facing the support part 12 being the open end. After the support part 12 enters the sleeve 20 through the flared opening, the sleeve 20 will expand outward under the action of the relief groove 22. It should be noted that, in addition to providing a relief groove 22 on the sleeve 20 for the sleeve 20 to expand, a sleeve 20 structure that can elastically deform can also be used.

[0037] In some embodiments, such as Figure 1As shown, the clearance groove 22 extends along the axial direction of the sleeve 20, and multiple clearance grooves 22 are evenly distributed along the circumference of the sleeve 20. These clearance grooves can divide the sleeve 20 into a multi-lobed structure; for example, three clearance grooves 22 can divide the sleeve 20 into a three-lobed structure. When the support part 12 extends into the sleeve 20, the multi-lobed structure of the sleeve 20 will swing outwards. Under the compression of the support part 12, the multi-lobed structure of the sleeve 20 will be squeezed between the support part 12 and the connector. It should be noted that extending the clearance groove 22 along the axial direction of the sleeve 20 is only a preferred arrangement. The clearance groove 22 can also be inclined relative to the axis of the sleeve 20, for example, the clearance groove 22 can extend spirally along the side wall of the sleeve 20. The specific extension structure of the clearance groove 22 can be set according to actual needs, as long as it ensures that the sleeve 20 expands outwards under the compression of the support part 12.

[0038] In some embodiments, such as Figure 1 and Figure 3 As shown, the support portion 12 is preferably a cylindrical portion. During the movement of the cylindrical portion towards the sleeve 20, the end of the cylindrical portion facing the nut 30 first contacts the inner wall of the flared opening. As the nut 30 continues to be tightened, the screw 10 continues to move, and the end of the cylindrical portion gradually pushes the flared opening outwards, causing the flared opening to gradually enlarge. Once the cylindrical portion enters the sleeve 20, its outer circumferential surface will be in close contact with the inner wall of the sleeve 20. At this point, the sleeve 20 will be opened by the cylindrical portion, thereby opening the snap-fit ​​portion 21 provided on the outer wall of the sleeve 20 outwards, thus achieving a tight connection with the component to be connected. The surface-to-surface contact between the cylindrical portion and the sleeve 20 improves the support stability of the support portion 12 on the sleeve 20, thereby improving the connection stability of the connecting bolt.

[0039] In some embodiments, such as Figure 3 As shown, the cylindrical portion has a transition portion 13 at one end facing the threaded portion 11. The outer diameter of the transition portion 13 gradually decreases from the cylindrical portion to the threaded portion 11, for example... Figure 3 As shown, the outer diameter of the transition section 13 gradually decreases from bottom to top. The transition section 13 can avoid the problem of excessive abrupt change in cross-section between the screw 10 and the cylindrical part, which is beneficial to ensuring the structural strength of the screw 10.

[0040] In some embodiments, the outer surface of the transition portion 13 is adapted to the inner surface of the flared opening. For example, when the flared opening is a bell opening 24, the outer surface of the transition portion 13 fits against the inner surface of the flared opening. Figure 1As shown, in the initial position, the flared end of the sleeve 20 is located at the transition section 13. When the nut 30 is tightened to move the screw 10 upward, the cylindrical portion at the lower end of the screw 10 will push the flared end outward, making it cylindrical. At this time, the outer surface of the cylindrical portion and the inner surface of the flared end are in close contact. It should be noted that the flared end is only a preferred structural form; a conical shape can also be selected, depending on the actual needs.

[0041] In some embodiments, such as Figure 1 As shown, the sleeve 20 has a flange 23 on its outer periphery facing the nut 30. The flange 23 can axially limit the sleeve 20. For example, when connecting two parts, they are arranged vertically. First, the support part 12 of the screw 10 is placed into the connecting hole of the lower part. Then, the upper part is placed on the flange 23. The nut 30 is then connected to the upper end of the screw 10. As the nut 30 is screwed downward, when the lower surface of the nut 30 contacts the upper surface of the upper part, the nut 30 does not move axially as the screw 30 continues to be screwed. At this time, the screw 10 will move upward, and the sleeve 20 will not move upward under the action of the flange 23. When the support part 12 enters the sleeve 20 through the flare, it will radially expand the sleeve 20. At this time, the snap-fit ​​part 21 on the outside of the sleeve 20 will snap into the connecting hole of the lower part, thereby realizing the connection of the two parts.

[0042] In some embodiments, the snap-fit ​​portion 21 is a barb integrally formed on the outer wall of the sleeve 20, wherein the angle between the extending direction of the barb and the upward axial direction of the sleeve 20 is an acute angle. The barb is preferably triangular. During manufacturing, two intersecting lines can be cut on the side wall of the sleeve 20, and then the cut structure can be folded upwards to form the barb. Furthermore, to improve the stability of the connection, the body structure of the sleeve 20 and the barb can be heat-treated to make the hardness of the barb greater than the hardness of the body structure of the sleeve 20. That is, the body of the sleeve 20 is softer than the barb, which facilitates the deformation of the sleeve 20 and also facilitates the insertion of the barb into the connection hole.

[0043] In some embodiments, such as Figure 1 As shown, the outer wall of the sleeve 20 is provided with multiple engaging portions 21 distributed along the circumferential direction and / or the axial direction. For example, the sleeve 20 is divided into a multi-lobed structure by multiple clearance grooves 22, and each lobe structure is provided with multiple engaging portions 21 distributed along the axial direction. The engaging portions 21 on each lobe structure can be located in the same circumferential direction or in different circumferential directions. The multiple engaging portions 21 can improve the connection stability of the connecting bolts.

[0044] This utility model embodiment also provides a composite material connecting assembly, including the connecting bolts provided in any of the above embodiments, and further including a composite material plate 100 and a connected member 200. The composite material plate 100 is provided with a first connecting hole, wherein the composite material plate 100 is preferably a carbon fiber composite material plate 100, and the carbon fiber composite material plate 100 is a thick-walled carbon fiber composite material plate 100. The connected member 200 is provided with a second connecting hole, and the connected member 200 can be made of composite material or metal material. The support part 12 and the sleeve 20 are located in the first connecting hole, and the threaded part 11 passes through the second connecting hole. The support part 12 is used to open the sleeve 20 under the tightening action of the nut 30 so that the snap-fit ​​part 21 snaps onto the inner wall of the first connecting hole. For the thick-walled carbon fiber composite material plate 100, currently, the main method is to embed a threaded insert inside the thick-walled carbon fiber composite material plate 100. The threaded insert can be fixed by pre-embedding or adhesive bonding. This application, by providing an expandable sleeve 20 over the connecting bolt, enables the snap-fit ​​portion 21 provided on the outside of the sleeve 20 to insert into the connecting hole of the thick-walled carbon fiber composite plate 100, which can effectively reduce the difficulty of the process operation of the thick-walled carbon fiber composite plate 100 and improve the work efficiency.

[0045] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0046] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0047] The foregoing has provided a detailed description of a connecting bolt and a composite material connecting assembly provided by this utility model. Specific examples have been used to illustrate the principle and implementation of this utility model. The descriptions of the embodiments above are merely for the purpose of helping to understand the core idea of ​​this utility model. It should be noted that those skilled in the art can make various improvements and modifications to this utility model without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A connecting bolt, characterized in that include: The screw (10) has a threaded portion (11) on the outer periphery of one end and a support portion (12) on the outer periphery of the other end. The outer diameter of the support portion (12) is larger than the outer diameter of the screw (10). Sleeve (20), the sleeve (20) is sleeved on the screw (10), the inner diameter of the sleeve (20) is smaller than the outer diameter of the support (12), the outer side wall of the sleeve (20) is provided with an outwardly protruding snap-fit ​​part (21), and the opening at one end of the sleeve (20) is a flared opening; Nut (30), the nut (30) is threaded to the threaded part (11), the nut (30) is used to drive the screw (10) to move axially when it is screwed, so that the support part (12) moves from the flared end into the sleeve (20) and opens the sleeve (20).

2. The connecting bolt according to claim 1, characterized in that The sleeve (20) has at least one clearance groove (22) on its side wall for the sleeve (20) to be pushed outward.

3. The connecting bolt according to claim 2, characterized in that The clearance groove (22) extends along the axial direction of the sleeve (20), and multiple clearance grooves (22) are evenly distributed along the circumferential direction of the sleeve (20).

4. The connecting bolt according to any one of claims 1 to 3, characterized in that The support part (12) is a cylindrical part.

5. The connecting bolt according to claim 4, characterized in that The cylindrical portion has a transition portion (13) at one end facing the threaded portion (11), and the outer diameter of the transition portion (13) gradually decreases from the cylindrical portion to the threaded portion (11).

6. The connecting bolt according to claim 5, characterized in that The outer surface of the transition portion (13) is adapted to the inner surface of the flared opening.

7. The connecting bolt of claim 1, wherein The sleeve (20) has a flange (23) on the outer periphery of the end facing the nut (30).

8. The connecting bolt of claim 1, wherein The snap-fit ​​part (21) is a barb integrally formed on the outer side wall of the sleeve (20).

9. The connecting bolt of claim 1, wherein The outer wall of the sleeve (20) is provided with a plurality of snap-fit ​​portions (21) distributed along the circumferential direction and / or the axial direction.

10. A composite material connection assembly, characterized by The assembly includes the connecting bolt as described in any one of claims 1 to 9, and further includes a composite material plate (100) and a connected part (200). The composite material plate (100) is provided with a first connecting hole, and the connected part (200) is provided with a second connecting hole. The support part (12) and the sleeve (20) are located in the first connecting hole, and the threaded part (11) extends out of the second connecting hole. The support part (12) is used to open the sleeve (20) under the turning action of the nut (30) so that the snap-fit ​​part (21) snaps onto the inner wall of the first connecting hole.

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