Fastening assembly and connecting system

Abstract

The utility model provides a fastening assembly and a connecting system, the provided fastening assembly is used for connecting a plate, the plate is provided with a through hole along the thickness direction, and the fastening assembly comprises a bolt and a bushing; the bolt comprises a flange part, an anti-torsion part and a first rod part which are sequentially connected in the axis direction of the bolt. The outer diameter of the flange part is larger than the aperture of the through hole, and the outer diameters of the torsion-resistant part, the first rod part and the bushing are smaller than the aperture of the through hole; the length of the lining in the axis direction of the bolt is larger than that of the anti-torque part. The hardness of the bolt and the plate is greater than that of the bushing; the bush can be arranged between the outer peripheral wall of the anti-torque part and the inner peripheral wall of the through hole and can be subjected to plastic deformation to be attached to the outer peripheral wall of the anti-torque part and the inner peripheral wall of the through hole. The fastening assembly provided by the utility model can maintain the original ultrahigh strength of the plate and the bolt, does not damage the original structural performance of the bolt, and ensures that a connecting system formed by the fastening assembly and the high-strength plate has stable torsion resistance and thrust resistance.

Description

Technical Field

[0001] The utility model belongs to the technical field of fasteners, and in particular relates to a fastening assembly and a connection system. Background Art

[0002] For the main load-bearing structural parts of automobiles, fasteners are generally used to connect the required plates by means of pressure riveting or flip riveting. In addition, other plate connection methods such as welding are also used. However, with the development of technology, the strength requirements of the plates used in automobile load-bearing structural parts are getting higher and higher. For high-strength plates, the corresponding fasteners are generally required to have very high strength, such as grade 10.9 and above. However, the higher the strength of the material, the worse its fluidity. Therefore, the conventional pressure riveting scheme is difficult to implement; and the flip riveting method generally requires the fasteners to have lower strength and be easy to deform, which is contrary to the high strength of the fasteners. At the same time, the position of the flip riveting deformation will also damage the surface electroplating layer, affecting the corrosion resistance. If welding is used, the high temperature and heat generated will destroy the original structural performance of the plate, and high-hardness materials generally have a high carbon content, which is not conducive to the implementation of welding. Utility Model Content

[0003] In view of the above-mentioned problems existing in the prior art, the main purpose of the present invention is to provide a fastening assembly and a connection system. The fastening assembly provided can maintain the original ultra-high strength of the plate and the bolt, does not destroy the original structural performance of the bolt, and ensures that the connection system formed with the high-strength plate has stable torsion and thrust resistance.

[0004] The purpose of the utility model is achieved through the following technical solutions:

[0005] The utility model provides a fastening assembly for connecting plates, wherein the plates are provided with through holes along the thickness direction thereof, and the fastening assembly comprises a bolt and a bushing; wherein,

[0006] The bolt comprises a flange portion, an anti-torsion portion and a first rod portion which are sequentially connected along its axial direction;

[0007] The outer diameter of the flange portion is larger than the aperture of the through hole, and the outer diameters of the anti-torsion portion, the first rod portion and the bushing are all smaller than the aperture of the through hole; the length of the bushing along the axial direction of the bolt is larger than the length of the anti-torsion portion; the hardness of the bolt and the plate are both larger than the hardness of the bushing; thereby, the anti-torsion portion can be sleeved in the through hole, the bushing can be arranged between the outer peripheral wall of the anti-torsion portion and the inner peripheral wall of the through hole, and the bushing can undergo plastic deformation and fit with the outer peripheral wall of the anti-torsion portion and the inner peripheral wall of the through hole.

[0008] As a further description of the above technical solution, the inner cross-sectional profile of the bushing is circular, and the outer cross-sectional profile of the bushing is circular or the same as the cross-sectional profile of the through hole.

[0009] As a further description of the above technical solution, the bushing is made of stainless steel or aluminum.

[0010] As a further description of the above technical solution, the circumferential outer edge of the anti-torsion portion is tooth-shaped, polygonal or thread-shaped.

[0011] As a further description of the above technical solution, a second rod portion is further provided between the flange portion and the anti-torsion portion, and an outer diameter of the second rod portion is smaller than an outer diameter of the flange portion and the anti-torsion portion.

[0012] As a further description of the above technical solution, the wall surface used to form the through hole includes a first inner peripheral wall and a second inner peripheral wall, and the inner diameter of the first inner peripheral wall is greater than the inner diameter of the second inner peripheral wall;

[0013] When the fastening assembly is connected to the plate, the first inner peripheral wall is farther away from the flange portion than the second inner peripheral wall.

[0014] As a further description of the above technical solution, the through hole provided on the plate is non-circular.

[0015] The utility model also provides a connection system, comprising:

[0016] A plate having through holes along its thickness;

[0017] A fastening assembly, comprising a bolt and a bushing; wherein,

[0018] The bolt comprises a flange portion, an anti-torsion portion and a first rod portion which are sequentially connected along its axial direction;

[0019] The outer diameter of the flange portion is larger than the aperture of the through hole, and the outer diameters of the anti-torsion portion, the first rod portion, and the bushing are all smaller than the aperture of the through hole; the length of the bushing along the axial direction of the bolt is larger than the length of the anti-torsion portion; the hardness of the bolt and the plate are both larger than the hardness of the bushing;

[0020] The anti-torsion portion is sleeved in the through hole, and the plastically deformed bushing is arranged between the outer peripheral wall of the anti-torsion portion and the inner peripheral wall of the through hole, and fits with the outer peripheral wall of the anti-torsion portion and the inner peripheral wall of the through hole.

[0021] As a further description of the above technical solution, the through hole provided on the plate is non-circular.

[0022] As a further description of the above technical solution, a second rod portion is further provided between the flange portion and the anti-torsion portion, and an outer diameter of the second rod portion is smaller than an outer diameter of the flange portion and the anti-torsion portion.

[0023] By means of the above technical solutions, the outstanding effects of the present invention are:

[0024] The fastening assembly provided by the present invention is used for connecting plates, and the plates are provided with through holes along the thickness direction thereof, and the fastening assembly comprises a bolt and a bushing; wherein the bolt comprises a flange portion, an anti-torsion portion and a first rod portion connected in sequence along the axial direction thereof; the outer diameter of the flange portion is larger than the aperture of the through hole, and the outer diameters of the anti-torsion portion, the first rod portion and the bushing are all smaller than the aperture of the through hole; the length of the bushing along the axial direction of the bolt is larger than the length of the anti-torsion portion; the hardness of the bolt and the plate are both larger than the hardness of the bushing; thereby the anti-torsion portion can be sleeved in the through hole, the bushing can be arranged between the outer peripheral wall of the anti-torsion portion and the inner peripheral wall of the through hole, and the bushing can undergo plastic deformation and fit with the outer peripheral wall of the anti-torsion portion The peripheral wall and the inner peripheral wall of the through hole fit together; when connecting the plates, it is only necessary to make the anti-torsion part of the bolt pass through the through hole provided in the plate along its thickness direction, and at the same time, the bushing is provided between the outer peripheral wall of the anti-torsion part and the inner peripheral wall of the through hole. Since the length of the bushing along the axial direction of the bolt is greater than the length of the anti-torsion part, and the hardness of the bolt and the plate are both greater than the hardness of the bushing, it is only necessary to apply force (with the help of a mold) to cause the bushing to undergo plastic deformation, so that it can fit together with the outer peripheral wall of the anti-torsion part and the inner peripheral wall of the through hole, thereby achieving a stable fastening connection between the bolt and the plate, and then the first rod portion of the bolt protruding from the plate can be connected to other parts to be connected. Therefore, after the plate and the bolt are fastened together, their own structural form does not change, and their original high strength is effectively maintained, ensuring that the formed connection system has stable anti-torsion and anti-thrust capabilities. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic structural diagram of a bolt in the first embodiment of the present utility model;

[0026] Figure 2 This is a schematic structural diagram of a bolt in the second embodiment of the present utility model;

[0027] Figure 3 This is a schematic structural diagram of a bolt in the third embodiment of the present utility model;

[0028] Figure 4 This is a schematic diagram of the structure of the bushing in the first embodiment of the utility model

[0029] Figure 5 This is a schematic structural diagram of a bushing in the third embodiment of the present utility model;

[0030] Figure 6 This is a structural diagram of a plate in the first embodiment of the present utility model;

[0031] Figure 7 This is a schematic structural diagram of a plate in a fourth embodiment of the present utility model;

[0032] Figure 8 This is a cross-sectional view of the first embodiment of the present invention in which the fastening assembly and the plate do not form a connection system;

[0033] Figure 9 This is a cross-sectional schematic diagram of a connection system formed by a fastening assembly and a plate in the first embodiment of the present utility model;

[0034] Figure 10 This is a cross-sectional schematic diagram of a connection system formed by a fastening assembly and a plate in a second embodiment of the present invention;

[0035] Figure 11 Schematic cross-sectional view of a connection system formed by a fastening assembly and a plate in a third embodiment of the present invention.

[0036] Description of Figure Numbers:

[0037] 1. Plate; 11. Through hole; 111. First inner circumferential wall; 112. Second inner circumferential wall; 2. Bolt; 21. Flange; 22. Anti-torsion portion; 23. First rod; 24. Second rod; 3. Bushing. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0039] In the description of the present invention, it should be noted that the terms "upper", "middle", "lower", "inside", "outside", "front", "back", "left", "right", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. The following describes the implementation of the present invention based on its overall structure.

[0040] See also Figures 1 to 11The utility model discloses a fastening assembly and a connection system. The disclosed fastening assembly is used to connect a plate 1. The plate 1 is provided with a through hole 11 along its thickness direction. The fastening assembly includes a bolt 2 and a bushing 3; wherein,

[0041] The bolt 2 includes a flange portion 21, an anti-torsion portion 22 and a first rod portion 23 connected in sequence along its axial direction;

[0042] The outer diameter of the flange portion 21 is larger than the aperture of the through hole 11, and the outer diameters of the anti-torsion portion 22, the first rod portion 23 and the bushing 3 are all smaller than the aperture of the through hole 11; the length of the bushing 3 along the axial direction of the bolt 2 is greater than the length of the anti-torsion portion 22; the hardness of the bolt 2 and the hardness of the plate 1 are both greater than the hardness of the bushing 3; thereby, the anti-torsion portion 22 can be sleeved in the through hole 11, and the bushing 3 can be arranged between the outer peripheral wall of the anti-torsion portion 22 and the inner peripheral wall of the through hole 11, and the bushing 3 can undergo plastic deformation and fit with the outer peripheral wall of the anti-torsion portion 22 and the inner peripheral wall of the through hole 11.

[0043] By virtue of the above structure, when connecting the plate 1, it is only necessary to allow the anti-torsion portion 22 of the bolt 2 to pass through the through hole 11 provided along the thickness direction of the plate 1, and at the same time, the bushing 3 is provided between the outer peripheral wall of the anti-torsion portion 22 and the inner peripheral wall of the through hole 11. Since the length of the bushing 3 along the axial direction of the bolt 2 is greater than the length of the anti-torsion portion 22, and the hardness of the bolt 2 and the plate 1 are both greater than the hardness of the bushing 3, it is only necessary to apply force (with the help of a mold) to cause the bushing 3 to undergo plastic deformation, so that it can fit with the outer peripheral wall of the anti-torsion portion 22 and the inner peripheral wall of the through hole 11, thereby achieving a stable fastening connection between the bolt 2 and the plate 1, and then the first rod portion 23 of the bolt 2 protruding from the plate 1 can be connected to other components to be connected. As a result, after the plate 1 and the bolt 2 are fastened together, their own structural form does not change, effectively maintaining their original high strength, and ensuring that the formed connection system has stable anti-torsion and anti-thrust capabilities.

[0044] For details, please refer to Figure 4 , Figure 7 as well as Figure 8In the first embodiment, the inner and outer cross-sectional profiles of the bushing 3 are both circular, that is, the bushing 3 is in the shape of a hollow cylinder as a whole, which is more convenient for the production and use of the bushing 3. It should be understood that when the through hole 11 of the plate 1 is non-circular, the outer diameter of the bushing 3 is at most equal to the minimum cross-sectional width of the through hole 11, thereby ensuring that the bushing 3 can be inserted into the through hole 11. Of course, in other embodiments, the outer cross-sectional profile of the bushing 3 can also be directly designed to be the same as the cross-sectional profile of the through hole 11, that is, the outer profile of the bushing 3 is contoured (for example, in the third embodiment, the outer profile of the bushing 3 is designed to be hexagonal), so as to reduce some material deformation and make its structure more compact. However, it should be understood that in the process of inserting the bushing 3 into the through hole 11, attention should be paid to the alignment of the two.

[0045] Specifically, in this embodiment, the bushing 3 is made of stainless steel (e.g., 304 stainless steel), which has good toughness and ductility, as well as excellent corrosion resistance and a certain strength. Therefore, after it undergoes plastic deformation under force and fills between the inner circumferential wall of the anti-torsion portion 22 and the inner circumferential wall of the through hole 11, it can effectively maintain a stable connection between the bolt 2 and the plate 1. Of course, in other embodiments, the bushing 3 can also be made of other materials that have good toughness, ductility, corrosion resistance, and a certain strength, such as aluminum.

[0046] See also Figure 1 、 Figure 8 and Figure 9 Specifically, in this embodiment, the bolt 2 includes a flange portion 21, an anti-torsion portion 22 and a first rod portion 23, which are connected in sequence from bottom to top, wherein the flange portion 21 is a circular flange, and a thread is formed on the outer wall of the first rod portion 23 to be connected to other components. The circumferential outer edge of the anti-torsion portion 22 is tooth-shaped. After the bushing 3 is subjected to force and undergoes plastic deformation, a portion of the material of the bushing 3 will flow into the adjacent tooth-shaped gap and the inner circumferential wall of the through hole 11, so that the plate 1 and the bolt 2 form a stable connection with excellent anti-torsion and anti-thrust capabilities. Of course, in other embodiments, the circumferential outer edge of the anti-torsion portion 22 can also be set to other shapes to be fitted and connected with the plastically deformed bushing 3. For example, in Example 2, as Figure 2 、 Figure 10 As shown, the circumferential outer edge of the anti-torsion portion 22 is threaded, and it is an extension of the thread of the first rod portion 23, which also facilitates the processing of the entire bolt 2; in the third embodiment, as shown Figure 3 、 Figure 11 As shown, the outer edge of the anti-torsion portion 22 is polygonal (eg, hexagonal).

[0047] Please continue reading Figure 1 、 Figure 8 and Figure 9 Specifically, in this embodiment, a second rod portion 24 is further provided between the flange portion 21 and the anti-torsion portion 22. The outer diameter of the second rod portion 24 is smaller than the outer diameters of the flange portion 21 and the anti-torsion portion 22. That is, the flange portion 21, the anti-torsion portion 22 and the second rod portion 24 therebetween jointly form an annular groove for the plastically deformed bushing 3 material to flow into, thereby providing additional anti-pullout force for the connection between the bolt 2 and the plate 1, making the connection between the bolt 2 and the plate 1 more stable.

[0048] See also Figure 6 ,as well as Figures 8 to 11 Specifically, in the first embodiment, the second embodiment and the third embodiment, the through holes 11 provided on the plate 1 are all stepped holes, that is, the wall surface used to form the through hole 11 includes a first inner peripheral wall 111 and a second inner peripheral wall 112, and the inner diameter of the first inner peripheral wall 111 is larger than the inner diameter of the second inner peripheral wall 112; when the fastening assembly is connected to the plate 1, the first inner peripheral wall 111 is farther away from the flange portion 21 than the second inner peripheral wall 112. The purpose of this structural setting is to ensure that after the bushing 3 undergoes plastic deformation, its top is flush with the opening of the through hole 11 away from the flange portion 21. Of course, as Figure 7 As shown, in other embodiments, if the application environment does not require the connection to be flush, the through hole 11 can also be directly set as a non-step hole.

[0049] See also Figures 6 to 11 Specifically, in the first embodiment, the second embodiment and the third embodiment, the through hole 11 is non-circular, that is, its cross section can be polygonal, elliptical, etc., in order to provide anti-torsion force.

[0050] See also Figures 8 to 11Specifically, the connection system disclosed in the present invention includes a plate 1 and a fastening assembly, wherein the plate 1 is provided with a through hole 11 along its thickness direction; the fastening assembly includes a bolt 2, wherein the bolt 2 includes a flange portion 21, an anti-torsion portion 22, and a first rod portion 23 connected in sequence along its axial direction; the outer diameter of the flange portion 21 is larger than the aperture of the through hole 11, and the outer diameters of the anti-torsion portion 22, the first rod portion 23, and the bushing 3 included in the fastening assembly are all smaller than the aperture of the through hole 11; The length of the bushing 3 along the axial direction of the bolt 2 is greater than the length of the anti-torsion portion 22; the hardness of the bolt 2 and the hardness of the plate 1 are both greater than the hardness of the bushing 3; the anti-torsion portion 22 is sleeved in the through hole 11, and the bushing 3 after plastic deformation is arranged between the outer peripheral wall of the anti-torsion portion 22 and the inner peripheral wall of the through hole 11, and fits with the outer peripheral wall of the anti-torsion portion 22 and the inner peripheral wall of the through hole 11, so that the plate 1 and the bolt 2 form a stable connection.

[0051] Specifically, in the first, second and third embodiments, a second rod portion 24 is further provided between the flange portion 21 and the anti-torsion portion 22, and the outer diameter of the second rod portion 24 is smaller than the outer diameters of the flange portion 21 and the anti-torsion portion 22, that is, the flange portion 21, the anti-torsion portion 22 and the second rod portion 24 therebetween jointly form an annular groove for the plastically deformed bushing 3 material to flow into, thereby providing additional anti-extrusion force for the connection between the bolt 2 and the plate 1, making the connection between the bolt 2 and the plate 1 more stable.

[0052] Specifically, in the first embodiment, the second embodiment, and the third embodiment, the through hole 11 provided in the plate 1 is non-circular in order to provide anti-torsion force.

[0053] Specifically, in the first embodiment, the second embodiment, and the third embodiment, the end of the bushing 3 facing the flange portion 21 after plastic deformation is in contact with the end surface of the flange portion 21 facing the anti-torsion portion 22, and the end of the bushing 3 facing away from the flange portion 21 after plastic deformation is flush with the opening of the through hole 11 facing away from the flange portion 21. Of course, in other embodiments, the end of the bushing 3 facing away from the flange portion 21 after plastic deformation may not be flush with the opening of the through hole 11 facing away from the flange portion 21. Depending on whether there is a flushing requirement, it can be set whether the through hole 11 is a stepped hole. For example, if there is a flushing requirement, the through hole 11 can be set as a stepped hole. If there is no flushing requirement, the through hole 11 can be set as a non-stepped hole.

[0054] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any changes, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A fastening assembly for connecting plates, wherein the plates are provided with through holes along their thickness direction, characterized in that: The fastening assembly includes a bolt and a bushing; wherein, The bolt comprises a flange portion, an anti-torsion portion and a first rod portion which are sequentially connected along its axial direction; The outer diameter of the flange portion is larger than the aperture of the through hole, and the outer diameters of the anti-torsion portion, the first rod portion and the bushing are all smaller than the aperture of the through hole; the length of the bushing along the axial direction of the bolt is larger than the length of the anti-torsion portion; the hardness of the bolt and the plate are both larger than the hardness of the bushing; thereby, the anti-torsion portion can be sleeved in the through hole, the bushing can be arranged between the outer peripheral wall of the anti-torsion portion and the inner peripheral wall of the through hole, and the bushing can undergo plastic deformation and fit with the outer peripheral wall of the anti-torsion portion and the inner peripheral wall of the through hole.

2. The fastening assembly according to claim 1, wherein: The inner cross-sectional profile of the bushing is circular, and the outer cross-sectional profile of the bushing is circular or the same as the cross-sectional profile of the through hole.

3. The fastening assembly according to claim 1, wherein: The bushing is made of stainless steel or aluminum.

4. The fastening assembly according to claim 1, wherein: The circumferential outer edge of the anti-torsion portion is in a tooth shape, a polygonal shape or a thread shape.

5. The fastening assembly according to claim 1, wherein: A second rod portion is further provided between the flange portion and the anti-torsion portion, and an outer diameter of the second rod portion is smaller than an outer diameter of the flange portion and the anti-torsion portion.

6. The fastening assembly according to claim 1, wherein: The wall surface for forming the through hole includes a first inner peripheral wall and a second inner peripheral wall, wherein the inner diameter of the first inner peripheral wall is greater than the inner diameter of the second inner peripheral wall; When the fastening assembly is connected to the plate, the first inner peripheral wall is farther away from the flange portion than the second inner peripheral wall.

7. The fastening assembly according to claim 1, wherein: The through holes provided on the plate are non-circular.

8. A connection system, characterized in that: include: A plate having through holes along its thickness; A fastening assembly, comprising a bolt and a bushing; wherein, The bolt comprises a flange portion, an anti-torsion portion and a first rod portion which are sequentially connected along its axial direction; The outer diameter of the flange portion is larger than the aperture of the through hole, and the outer diameters of the anti-torsion portion, the first rod portion, and the bushing are all smaller than the aperture of the through hole; the length of the bushing along the axial direction of the bolt is larger than the length of the anti-torsion portion; the hardness of the bolt and the plate are both larger than the hardness of the bushing; The anti-torsion portion is sleeved in the through hole, and the plastically deformed bushing is arranged between the outer peripheral wall of the anti-torsion portion and the inner peripheral wall of the through hole, and fits with the outer peripheral wall of the anti-torsion portion and the inner peripheral wall of the through hole.

9. The connection system according to claim 8, characterized in that The through holes provided on the plate are non-circular.

10. The connection system according to claim 8, characterized in that A second rod portion is further provided between the flange portion and the anti-torsion portion, and an outer diameter of the second rod portion is smaller than an outer diameter of the flange portion and the anti-torsion portion.

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