Fixing connection structure and vehicle applying same

Abstract

This application provides a fixed connection structure and a vehicle using the same. The fixed connection structure includes a first fixing member, a second fixing member, and a connector; the first fixing member includes a receiving groove extending through along a first direction, the second fixing member includes a solid area without openings, the first fixing member and the second fixing member are stacked along the first direction, and the spatial projection of the receiving groove and the solid area along the first direction at least partially overlaps; the connector connects the first fixing member and the second fixing member, and the connector includes a welding portion, the welding portion is disposed in the receiving groove, and the bottom wall of the welding portion is connected to the solid area; the welding portion includes a thinning cavity, the thinning cavity is located on the side of the bottom wall away from the solid area, and is used to thin the bottom wall. The vehicle includes a main body and the aforementioned fixed connection structure, the fixed connection structure being installed on the main body.

Description

Technical Field

[0001] This application relates to the field of automotive parts, and more particularly to a fixed connection structure and a vehicle using the same. Background Technology

[0002] With the development of lightweight automotive bodies, hybrid material body structures, mainly composed of lightweight materials such as carbon fiber composites, glass fiber composites, aluminum alloys, high-strength steel, and hot-formed steel, have become the mainstream. Based on this, achieving efficient and high-quality bonding between composite materials and other metal materials has become the key to manufacturing hybrid material body structures.

[0003] Typically, there are significant differences in the physical and chemical properties between composite materials and metals, making it difficult to achieve an effective bond using conventional welding processes. Currently, the main methods for joining composite and metal materials are mechanical connections such as self-piercing riveting and zip-lining, as well as adhesive bonding. Self-piercing riveting imposes strict requirements on the thickness, strength, and ductility of the metal sheet; zip-lining requires pre-drilling holes in both the metal and composite sheets to be joined, increasing the precision requirements for connection point positioning and dimensional fit between workpieces during body-in-white manufacturing, which is detrimental to automation; simple adhesive bonding suffers from poor peel resistance and aging issues over time. How to avoid or overcome these problems, ensuring connection strength while reducing manufacturing difficulty, is a question that those skilled in the art need to consider. Utility Model Content

[0004] To address the problems in the prior art, embodiments of this application provide a fixed connection structure with high connection strength and low manufacturing difficulty, and a vehicle using the same.

[0005] This application provides a fixed connection structure, which includes a first fixing member, a second fixing member, and a connector. The first fixing member includes a receiving groove that extends through a first direction; the second fixing member includes a solid area without openings, the first fixing member and the second fixing member are stacked along the first direction, and the spatial projection of the receiving groove and the solid area along the first direction at least partially overlaps; the connector connects the first fixing member and the second fixing member, and the connector includes a welding portion, the welding portion is disposed in the receiving groove, and the bottom wall of the welding portion is connected to the solid area; the welding portion includes a thinning cavity, the thinning cavity is located on the side of the bottom wall away from the solid area, and is used to thin the bottom wall.

[0006] Understandably, the first fastener is positioned within the receiving groove, which can be pre-drilled. The second fastener, however, does not require a hole, significantly reducing the tolerance requirements for the fit between the first and second fasteners, lowering manufacturing complexity, and facilitating automation. The spatial projection of the receiving groove at least partially overlaps with the solid area, exposing the solid area through the receiving groove. Therefore, the connector can be positioned within the receiving groove and abut against the solid area to connect the first and second fasteners. The connector is welded to the solid area, forming a weld nugget to ensure the connection strength between the connector and the second fastener. The thinned cavity is located on the side of the bottom wall away from the solid area; that is, the actual thickness or unit volume of the bottom wall along the first direction is smaller than the overall thickness or unit volume of the welded part or the connector. This reduces the heat input required during welding, lowers welding energy consumption, and prevents the first fastener from burning out during welding.

[0007] In one embodiment, the connector is welded to the solid area to form a weld nugget, and the outer diameter of the weld nugget's spatial projection along the first direction is smaller than the inner diameter of the bottom wall and / or the receiving groove's spatial projection along the first direction.

[0008] In one embodiment, the weld nugget extends within the bottom wall along the first direction and extends from the bottom wall to the solid area;

[0009] Alternatively, the weld nugget may be disposed through the second fastener along the first direction and extend from the solid area to the bottom wall;

[0010] Alternatively, the weld nugget may be disposed along the first direction, penetrating the bottom wall and the second fixing member.

[0011] In one embodiment, the projection of the outer edge of the weld nugget along the first direction is located inside the projection of the outer edge of the weld portion along the first direction.

[0012] In one embodiment, the welding part is in the shape of a rotating body, and the welding part further includes an annular sidewall. The bottom wall is connected to the sidewall and is located on one side of the sidewall along the first direction. The sidewall and the bottom wall enclose the thinning cavity. The sidewall is disposed towards the inner wall of the receiving groove and is used to abut or connect with the first fixing member. The bottom wall is disposed with the solid area along the first direction towards the side where the first fixing member is located.

[0013] In one embodiment, the first fixing member is plate-shaped, the thickness of the first fixing member along the first direction is L1, the thickness of the bottom wall along the first direction is L4, and the thickness of the side wall along the second direction perpendicular to the first direction is L5; wherein the ratio of L4 to L1 is in the range of 0.5 to 1.0, and / or the ratio of L5 to L1 is in the range of 0.5 to 1.0.

[0014] In one embodiment, the connector further includes a fixing part, which is connected to the side wall and located on the side of the side wall away from the bottom wall. The outer diameter of the fixing part is larger than the outer diameter of the welding part. The fixing part is spaced apart from the solid area along the first direction and is used to engage or abut with the first fixing member.

[0015] In one embodiment, the fixing part is annular and surrounds the welding part, and the bottom wall is exposed via the thinned cavity on the side opposite to the solid area.

[0016] In one embodiment, the number of the first fasteners is one or more, and the one or more first fasteners are stacked along the first direction, and at least one of the solid areas is exposed via the receiving groove. The number of the second fasteners is one or more, and the one or more second fasteners are stacked along the first direction on the same side of the one or more first fasteners. The weld nugget is disposed through the one or more second fasteners along the first direction.

[0017] In one embodiment, the number of the first fasteners is one or more, the number of the second fasteners is multiple, at least one of the multiple second fasteners is provided with the solid area, and at least another of the multiple second fasteners includes the receiving groove disposed therethrough along the first direction, and the receiving groove of one or more first fasteners communicates with the receiving groove of at least one second fastener along the first direction and exposes the solid area.

[0018] Other embodiments of this application also provide a vehicle, which includes a main body and a fixed connection structure as described in any of the foregoing embodiments, the fixed connection structure being mounted on the main body.

[0019] Understandably, the vehicle application of this application has the aforementioned fixed connection structure, which not only ensures the connection strength of the vehicle but also reduces the manufacturing difficulty of the vehicle. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the fixed connection structure and the welding head provided in an embodiment of this application.

[0021] Figure 2A schematic diagram of the connector of the fixed connection structure provided in an embodiment of this application is shown; wherein, (a) is a cross-sectional schematic diagram of the connector and (b) is a three-dimensional schematic diagram of the connector.

[0022] Figure 3 This is a schematic diagram of a fixed connection structure provided in another embodiment of this application.

[0023] Figure 4 This is a schematic diagram of a fixed connection structure provided in another embodiment of this application.

[0024] Figure 5 This is a schematic diagram of the connector of a fixed connection structure provided in another embodiment of this application.

[0025] Figure 6 A schematic diagram of the connector of the fixed connection structure provided in another embodiment of this application is shown; wherein, (a) is a cross-sectional schematic diagram of the connector and (b) is a three-dimensional schematic diagram of the connector.

[0026] Figure 7 A schematic diagram of the connector of the fixed connection structure provided in another embodiment of this application is shown; wherein, (a) is a cross-sectional schematic diagram of the connector and (b) is a three-dimensional schematic diagram of the connector.

[0027] Figure 8 A schematic diagram of the connector of the fixed connection structure provided in another embodiment of this application is shown; wherein, (a) is a cross-sectional schematic diagram of the connector and (b) is a three-dimensional schematic diagram of the connector.

[0028] Figure 9 This is a schematic diagram of a vehicle provided in an embodiment of this application.

[0029] Explanation of main component symbols

[0030] Fixed connection structure 10

[0031] Receiving tank 101

[0032] Inner wall 1010

[0033] Solid Zone 102

[0034] Welding core 103

[0035] First fastener 11

[0036] Second fastener 12

[0037] Connector 13

[0038] Thinning of cavity 130

[0039] Welding part 131

[0040] outer perimeter 1310

[0041] Bottom wall 1311

[0042] Side wall 1312

[0043] Fixing part 132

[0044] Reinforcing rib 133

[0045] Transition rounded corner structure 134

[0046] 14 Boss structure

[0047] Vehicle 2

[0048] Main body 21

[0049] Welding head 3

[0050] Laser source 4

[0051] First direction F

[0052] Second direction R

[0053] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this application. Detailed Implementation

[0054] The following description will be given with reference to the accompanying drawings for a more complete description of the present application. The drawings illustrate exemplary embodiments of the present application. However, the present application may be implemented in many different forms and should not be construed as limited to the exemplary embodiments set forth herein. These exemplary embodiments are provided to make the present application thorough and complete, and to fully convey the scope of the present application to those skilled in the art. Similar reference numerals denote the same or similar components. The terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to limit the present application. As used herein, the singular forms “a,” “an,” and “the” are intended to also include the plural forms unless the context clearly indicates otherwise. Furthermore, when used herein, “comprising” and / or “including” and / or “having,” integers, steps, operations, components, and / or components, but without excluding the presence or addition of one or more other features, regions, integers, steps, operations, components, and / or groups thereof. Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. Furthermore, unless explicitly defined herein, terms such as those defined in a general dictionary should be interpreted as having the same meaning as they have in the relevant technology and in the content of this application, and should not be interpreted as having an idealized or overly formal meaning.

[0055] Typically, there are significant differences in the physical and chemical properties between composite materials and metals, making it difficult to achieve an effective bond using conventional welding processes. Currently, the main methods for joining composite and metal materials are mechanical connections such as self-piercing riveting and zip-lining, as well as adhesive bonding. Self-piercing riveting imposes strict requirements on the thickness, strength, and ductility of the metal sheet; zip-lining requires pre-drilling holes in both the metal and composite sheets to be joined, increasing the precision requirements for connection point positioning and dimensional fit between workpieces during body-in-white manufacturing, which is detrimental to automation; simple adhesive bonding suffers from poor peel resistance and aging issues over time. How to avoid or overcome these problems, ensuring connection strength while reducing manufacturing difficulty, is a question that those skilled in the art need to consider.

[0056] Correspondingly, this application provides a fixed connection structure and a vehicle using the same. The fixed connection structure includes a first fixing member, a second fixing member, and a connecting member; the first fixing member includes a receiving groove extending through along a first direction, the second fixing member includes a solid area without openings, the first fixing member and the second fixing member are stacked along the first direction, and the spatial projection of the receiving groove and the solid area along the first direction at least partially overlaps; the connecting member connects the first fixing member and the second fixing member, and the connecting member includes a welding portion, the welding portion is disposed in the receiving groove, and the bottom wall of the welding portion is connected to the solid area; the welding portion includes a thinning cavity, the thinning cavity is located on the side of the bottom wall away from the solid area, and is used to thin the bottom wall. The vehicle includes a main body and the aforementioned fixed connection structure, the fixed connection structure being installed on the main body.

[0057] Furthermore, the first fastener is correspondingly disposed in the receiving groove, which can be pre-drilled, while the second fastener does not require an opening. This significantly reduces the tolerance requirements for the fit between the first and second fasteners, lowers manufacturing difficulty, and facilitates automation. The spatial projection of the receiving groove at least partially overlaps with that of the solid area, exposing the solid area through the receiving groove; therefore, the connector can be disposed in the receiving groove and abut against the solid area to connect the first and second fasteners. The connector is welded to the solid area, forming a weld nugget to ensure the connection strength between the connector and the second fastener. The thinned cavity is located on the side of the bottom wall away from the solid area, that is, the actual thickness or actual unit volume of the bottom wall along the first direction is smaller than the thickness or unit volume of the welded part or the connector as a whole, reducing the heat input required for the welded part during welding, reducing welding energy consumption, and preventing the first fastener from being burned by heat during welding.

[0058] The following description, in conjunction with the accompanying drawings, illustrates exemplary embodiments. It should be noted that components depicted in the drawings are not necessarily shown to scale; and identical or similar components will be designated with the same or similar reference numerals or similar technical terms.

[0059] The specific embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0060] like Figures 1 to 2 As shown, this application embodiment provides a fixed connection structure 10. The fixed connection structure 10 includes a first fixing member 11, a second fixing member 12, and a connector 13. The first fixing member 11 and the second fixing member 12 are stacked along a first direction F, and the connector 13 connects and locks the first fixing member 11 and the second fixing member 12.

[0061] In one embodiment, the first fixing member 11 includes a receiving groove 101 extending through along a first direction F; the second fixing member 12 includes a solid region 102 without openings, the first fixing member 11 and the second fixing member 12 are stacked along the first direction F, and the spatial projections of the receiving groove 101 and the solid region 102 along the first direction F at least partially overlap. The connecting member 13 includes a welding portion 131, which is disposed in the receiving groove 101 and whose bottom wall 1311 is connected to the solid region 102; the welding portion 131 includes a thinning cavity 130, which is located on the side of the bottom wall 1311 away from the solid region 102, and is used to thin the bottom wall 1311.

[0062] Understandably, the first fastener 11 is correspondingly disposed in the receiving groove 101, which can be pre-drilled. The second fastener 12 does not require a hole, significantly reducing the tolerance requirements for the fit between the first fastener 11 and the second fastener 12, lowering manufacturing difficulty, and facilitating automation. The spatial projection of the receiving groove 101 at least partially overlaps with that of the solid area 102, exposing the solid area 102 through the receiving groove 101. Therefore, the connector 13 can be disposed in the receiving groove 101 and abut against the solid area 102 to connect the first fastener 11 and the second fastener 12. The connector 13 is welded to the solid area 102, forming a weld nugget 103 to ensure the connection strength between the connector 13 and the second fastener 12. The thinned cavity 130 is located on the side of the bottom wall 1311 away from the solid area 102. That is, the actual thickness or actual unit volume of the bottom wall 1311 along the first direction F is smaller than the thickness or unit volume of the welded part 131 as a whole or the connector 13 as a whole. This reduces the heat input required by the welded part 131 during the welding process, reduces welding energy consumption, and at the same time avoids the first fastener 11 from being burned by heat during the welding process.

[0063] It needs further explanation that the thinned cavity 130 is formed in the bottom wall 1311, which is used to contact and weld with the solid area 102 to form a weld nugget 103. Compared with the welded part 131 being arranged longitudinally along the first direction F through the connector 13, the thinned bottom wall 1311 has a smaller thickness or smaller actual unit volume along the first direction F, which reduces the heat required for the bottom wall 1311 to melt. The thinned cavity 130 can be located on the side of the bottom wall 1311 away from the solid area 102 along the first direction F, which is equivalent to forming the bottom wall 1311 by subtracting material from the welded part 131. The term "subtracting material" does not limit the formation of the thinned cavity 130 on the bottom wall 1311 by a subtractive manufacturing process. It can also mean that the bottom wall 1311 with a smaller thickness or actual volume is integrally formed during the manufacturing process of the connector 13.

[0064] In one embodiment, both the first fixing member 11 and / or the second fixing member 12 may have a receiving groove 101, but at least one of the second fixing members 12 should have a solid area 102 without holes. The receiving groove 101 extends through the first fixing member 11 and / or the second fixing member 12 generally along the first direction F, and is mainly used to accommodate the connector 13 passing through the first fixing member 11 so that it can directly contact the second fixing member 12. The solid area 102 is the area on the second fastener 12 that can be exposed by the receiving groove 101. It does not mean that there is a relatively small predetermined area on the second fastener 12 that needs to correspond to the receiving groove 101, but rather that there is a relatively large area on the second fastener 12, so that even if the first fastener 11 and the second fastener 12 are displaced due to assembly tolerances, the receiving groove 101 can still expose at least part of the solid area 102. It should be explained that the terms "relatively small" and "relatively large" are the result of comparing the two situations mentioned above, and do not involve other conventional parameters, nor do they limit the specific size of the solid area 102 and / or the receiving groove 101.

[0065] In one embodiment, the connector 13 is welded to the solid region 102 to form a weld nugget 103. The weld nugget 103 refers to the structure formed after the second fastener 12 and the connector 13 are heated, melted, and resolidified during the welding process. It is located at one end of the connector 13 near the solid region 102 and in the solid region 102 of at least one second fastener 12, and is used to connect the connector 13 to at least one second fastener 12. The size of the weld nugget 103 can be controlled by controlling the laser welding time, light path, power, etc. Those skilled in the art should understand that this is certainly possible, and will not be elaborated here.

[0066] Understandably, the first direction F can be any straight line in three-dimensional space, and the first fixing member 11 and the second fixing member 12 can be stacked along this straight line; the second direction R is a straight line perpendicular to the first direction F. The first direction F can be parallel to one of the three directions of vehicle 2: length, width, or height, or it can be non-parallel to all three and intersect at any angle; those skilled in the art should understand that this is certainly achievable, and will not be elaborated here.

[0067] In one embodiment, the first fixing member 11 and the second fixing member 12 may be made of different materials or have different structures.

[0068] In this embodiment, the first fastener 11 and the second fastener 12 are shown as plate-shaped. The first fastener 11 and the second fastener 12 can be two different parts of the car body that need to be connected. For example, the first fastener 11 can be a composite material plate (such as carbon fiber), and the second fastener 12 can be a metal plate (such as aluminum and aluminum alloy).

[0069] In this embodiment, the connector 13 is a connecting structure that connects the first fixing member 11 and the second fixing member 12. It can be connected to the first fixing member 11 by means of interference fit, extrusion, or bonding, and then connected to the second fixing member 12 by welding. In this embodiment, both the connector 13 and the second fixing member 12 can be made of metal, and they can achieve a firm fit by welding.

[0070] In other embodiments, the first fixing member 11 and the second fixing member 12 may also have other structures or shapes, and the connecting member 13 may also be made of other materials, provided that the connecting member 13 can be welded to the second fixing member 12. Those skilled in the art will understand that this is certainly achievable, and will not be elaborated here.

[0071] In this embodiment, the first fixing member 11 is a composite material plate, the second fixing member 12 is a metal plate, and the connecting member 13 is a hollow metal rivet. The first fixing member 11 and the connecting member 13 are fixedly connected by riveting, and the second fixing member 12 and the connecting member 13 are connected by laser welding. The actual connection process can be as follows: the first fixing member 11 is pre-drilled to form a receiving groove 101, and the connecting member 13 is embedded in the receiving groove 101; the second fixing member 12 is stacked and overlapped with the first fixing member 11 to ensure that the solid area 102 of the second fixing member 12 can contact the bottom wall 1311 of the connecting member 13; the second fixing member 12 and / or the connecting member 13 are heated and melted simultaneously by welding, so that the connecting member 13 and the second fixing member 12 are fused together, and after cooling, they are joined into one piece, realizing the welding and riveting between the first fixing member 11 and the second fixing member 12. Among them, the connector 13 and the first fixing member 11 are preferably made of the same metal material to ensure that they can be fused in the liquid state and form a weld nugget 103 after cooling; the welding heating methods used include resistance spot welding, laser welding without filler wire and with concentrated energy, and plasma arc welding.

[0072] That is, the embodiments of this application provide a laser welding and riveting process between a composite material plate and a metal plate. It can be understood that the laser welding and riveting process between the composite material plate and the metal plate provided in the embodiments of this application makes full use of the advantage of the high energy density of the laser to concentrate and simultaneously heat a local position (solid area 102) of the metal material connector 13 and the corresponding metal material second fixing member 12, so as to realize the fusion of the connector 13 and the second fixing member 12. At the same time, the connector 13 is riveted to the first fixing member 11, and the connection of the composite material plate (first fixing member 11) and the metal plate (second fixing member 12) is completed by the connector 13.

[0073] Understandably, the laser welding and riveting process between the composite material plate and the metal plate provided in this application embodiment, while retaining the advantages of the riveting process, reduces the restrictive requirements on the thickness, strength, and ductility of the second fixing member 12 (metal plate); it only requires pre-drilling in the first fixing member 11 (composite material plate), reducing the fit tolerance requirements between workpieces in actual production and facilitating automation. On the other hand, combined with the characteristics of rapid and concentrated heat input in laser welding and the size control of the weld nugget 103, the outer diameter of the spatial projection of the weld nugget 103 along the first direction F is smaller than the inner diameter of the spatial projection of the receiving groove 101 along the first direction F, avoiding burn-out of the first fixing member 11 (composite material plate) due to welding heat.

[0074] In one embodiment, the outer diameter of the spatial projection of the weld nugget 103 along the first direction F is smaller than the inner diameter of the spatial projection of the bottom wall 1311 and / or the receiving groove 101 along the first direction F.

[0075] In this embodiment, the bottom wall 1311 is welded to the solid area 102, and the weld nugget 103 extends to the bottom wall 1311. The outer diameter of the spatial projection of the weld nugget 103 along the first direction F is smaller than the spatial projection of the bottom wall 1311 along the first direction F, so as to minimize the heat transfer to the first fastener 11 during the welding process and avoid damage to the first fastener 11 due to overheating.

[0076] Understandably, the outer diameter of the weld nugget 103 projected along the first direction F is smaller than the inner diameter of the receiving groove 101 projected along the first direction F, thus avoiding negative impacts on the first fastener 11 during the welding process of the connector 13 and the second fastener 12. Especially for the first fastener 11 and the second fastener 12 made of different materials, the choice between opening or not opening holes, and / or whether to use them for welding, can be based on their material, reducing manufacturing difficulty and ensuring connection strength.

[0077] In one embodiment, the projection of the outer edge of the weld nugget 103 along the first direction F is located inside the projection of the outer edge of the weld portion 131 along the first direction F.

[0078] It is understandable that the projection of the outer edge of the weld nugget 103 is located inside the projection of the outer edge of the weld portion 131, so as to avoid the weld nugget 103 being too wide and to avoid the first fastener 11 being burned by the heat of laser welding.

[0079] Further integration Figure 2 As shown, the connector 13 further includes a fixing part 132, and the welding part 131 further includes a side wall 1312. The bottom wall 1311 is connected to the side wall 1312 and is located on one side of the side wall 1312 along the first direction F. The side wall 1312 and the bottom wall 1311 enclose a thinned cavity 130. The fixing part 132 is connected to the side wall 1312 and is located on the side of the side wall 1312 away from the bottom wall 1311. The side wall 1312 is disposed towards the inner wall 1010 of the receiving groove 101 and is used to abut or connect with the first fixing member 11. The bottom wall 1311 is disposed with the solid area 102 along the first direction F towards the side where the first fixing member 11 is located.

[0080] In this embodiment, the welding part 131 is disposed in the receiving groove 101, and the outer peripheral surface 1310 of the side wall 1312 is disposed facing the inner wall 1010 of the receiving groove 101. The outer peripheral surface 1310 is abutted or connected to the first fixing member 11. The welding part 131 can be disposed in the receiving groove 101 and held by interference fit, or an adhesive can be provided between the welding part 131 and the first fixing member 11 to connect the two.

[0081] In one embodiment, the welding part 131 is in the shape of a body of revolution, specifically a semi-hollow cap-like structure of a body of revolution; the term "body of revolution" further refers to a structure capable of rotational symmetry about a central axis, such as a regular shape like a cylinder, sphere, or hemisphere, as well as an irregular shape assembled from regular shapes in a rotatable posture, such as bolts or other components. The sidewall 1312 is a hollow annulus, and the bottom wall 1311 is circular and covers one end of the annular sidewall 1312 along the first direction F. The other end of the annular sidewall 1312 along the first direction F is an open structure, exposing the thinned cavity 130.

[0082] In this embodiment, the fixing part 132 is annular and surrounds the welding part 131. The bottom wall 1311 is exposed through the thinning cavity 130 on the side away from the solid area 102.

[0083] Understandably, the fixing part 132 is configured as an annular shape (or other hollow shape) surrounding the outside of the fixing part 132, exposing the side of the thinned cavity 130 away from the bottom wall 1311; thus, during the welding process, if electric welding is used, the welding head 3 (such as...) Figure 1 (As shown) can be inserted into the thinned cavity 130 and directly contact the bottom wall 1311. If laser welding is used and the laser source 4 (such as...) Figure 3 As shown, if the laser is located on one side of the first fixing member 11, it can pass through the thinned cavity 130 and act directly on the bottom wall 1311. At the same time, the thickness of the bottom wall 1311 along the first direction F is smaller than the thickness of the entire welding part 131 or the connecting member 13 along the first direction F, resulting in less heat consumption during the welding process. This can avoid thermal damage to the first fixing member 11 and improve the welding accuracy.

[0084] In other embodiments, the thinning cavity 130 may also be a closed cavity, with at least a portion of the thinning cavity 130 located on the side of the bottom wall 1311 away from the solid region 102 along the first direction F, for reducing the thickness of the welded portion 131 along the first direction F; in this case, laser welding can be used to weld from the side of the second fixing member 12 away from the welded portion 131.

[0085] In other embodiments, the thinned cavity 130 may also be a plurality of discontinuous spaces, or at least a portion of the space between the bottom wall 1311 and the solid region 102 may also be a hollow structure to reduce the volume of the bottom wall 1311 that is heated and reduce the input welding heat.

[0086] In one embodiment, the outer diameter of the fixing part 132 is larger than the outer diameter of the welding part 131; the fixing part 132 is spaced apart from the solid area 102 along the first direction F, and the fixing part 132 is used to engage or abut with the first fixing member 11.

[0087] Understandably, the shape of the welded portion 131 generally matches the shape of the receiving groove 101, so that the welded portion 131 can at least be located in the receiving groove 101 along the first direction F and contact the solid area 102. The fixing portion 132 is connected to the welded portion 131 and acts as a force-bearing unit. The outer diameter of the fixing portion 132 along the second direction R is larger than the outer diameter of the welded portion 131 along the second direction R. The outer diameter of the fixing portion 132 along the second direction R is also generally larger than the inner diameter of the receiving groove 101 along the second direction R, so that the fixing portion 132 can engage or abut with the first fixing member 11.

[0088] In one embodiment, the fixing part 132 protrudes relative to the welding part 131 along the second direction R and can abut against the surface of the first fixing member 11 away from the second fixing member 12 along the first direction F. It is understood that the welding part 131 needs to have a certain embedding strength into the first fixing member 11 so that the embedded connector 13 will not fall off during the first fixing member 11's flipping, transporting, or vibration. Sealant can be used to fix the connector 13 to the first fixing member 11, preventing the connector 13 from falling off and achieving a seal at the joint.

[0089] In one embodiment, the first fixing member 11 is plate-shaped, and the thickness of the first fixing member 11 along the first direction F is L1; the second fixing member 12 is plate-shaped, and the thickness of the second fixing member 12 along the first direction F is L2; ​​the thickness of the fixing part 132 along the first direction F is L3; the thickness of the bottom wall 1311 along the first direction F is L4; the thickness of the side wall 1312 along the second direction R is L5; the distance (nail length) between the lower surface of the bottom wall 1311 and the lower surface of the fixing part 132 along the first direction F is L6; the inner diameter of the side wall 1312 along the second direction R (the diameter of the blind hole corresponding to the thinned cavity 130, or understood as the inner diameter of the nail foot) is D1; ​​the outer diameter of the fixing part 132 along the second direction R (outer diameter of the nail head) is D2; the outer diameter of the bottom wall 1311 along the second direction R (outer diameter of the nail foot) is D3; and the outer diameter of the weld nugget 103 along the second direction R is D4.

[0090] The thickness L3 of the fixing part 132 needs to be controlled at more than 0.8 mm to ensure the fastening force of the fixing part 132 on the first fixing member 11.

[0091] The ratio of L4 to L1 is between 0.5 and 1.0. Understandably, the thickness L4 of the bottom wall 1311 along the first direction F increases with the increase of the first fastener 11 L1 and / or the increase of the joint strength requirement; the thickness of the bottom wall 1311 is usually smaller than the thickness of the first fastener 11 to reduce the heat input for welding, while the thickness of the bottom wall 1311 should not be too small to avoid insufficient connection strength.

[0092] The ratio of L5 to L1 is between 0.5 and 1.0. Understandably, the thickness of the bottom wall 1311 is typically smaller than the thickness of the first fastener 11 to ensure good connection strength of the connector 13 while reducing the heat input during welding. Correspondingly, the diameter of the receiving groove 101 is the same as the outer diameter D3 of the nail foot. By controlling the dimensional tolerances of the receiving groove 101 and the welded part 131, an interference fit connection is achieved between the welded part 131 and the receiving groove 101.

[0093] In general, L1 and L6 are roughly equal, and their dimensional deviation should be controlled within ±0.2 mm. In practical applications, the length of the nail leg L6 can vary with the thickness L1 of the first fastener 11 it is connected to. When multiple first fasteners 11 are stacked, L6 is roughly the sum of multiple L1s.

[0094] The inner diameter (diameter of the nail foot inner hole) D1 of the side wall 1312 along the second direction R is controlled between 4.0 and 9.0 mm. The outer diameter (outer diameter of the nail head) D2 of the fixing part 132 along the second direction R needs to be more than 4.0 mm larger than the outer diameter (outer diameter of the nail foot) D3 of the bottom wall 1311 along the second direction R, and the outer diameter of the nail head D2 is controlled between 8.0 and 20.0 mm.

[0095] Further integration Figure 3 and Figure 4 As shown, in one embodiment, the distribution pattern of the weld nugget 103 in the bottom wall 1311 and the solid area 102 can be various, which can correspond to various different welding methods.

[0096] In one embodiment, such as Figure 3 As shown, the weld nugget 103 is disposed through the second fixing member 12 along the first direction F and extends from the solid area 102 to the bottom wall 1311.

[0097] In one embodiment, such as Figure 4 As shown, the weld nugget 103 extends along the first direction F within the bottom wall 1311 and extends from the bottom wall 1311 to the solid area 102.

[0098] Alternatively, in other embodiments, the weld nugget 103 is disposed along the first direction F through the bottom wall 1311 and the second fastener 12.

[0099] Understandably, when the welding method used is a single-sided welding method such as laser welding or plasma arc welding, the welding surface can be flexibly selected based on the thickness relationship between the first fixing member 11 and the second fixing member 12. When the thickness L1 of the first fixing member 11 is less than 1.0 mm, or the thickness L2 of the second fixing member 12 is greater than 2.0 mm and the ratio of L1 to L2 is less than 2, the laser or plasma arc welding is performed from the fixing part 132 side of the connector 13 (or the side of the first fixing member 11 away from the second fixing member 12) for further bonding. Figure 3 As shown), the penetration depth of the weld nugget 103 into the solid region 102 is controlled within 1.0 mm to avoid excessive heat input causing burn-out of the first fixture 11 near the joint. In other cases, laser or plasma arc welding can be performed from the side of the second fixture 12 away from the first fixture 11 (further combined with... Figure 4 As shown), the penetration depth of the weld nugget 103 into the bottom wall 1311 is controlled within 1.0 mm, or does not exceed the thickness L4 of the bottom wall 1311, so as to avoid excessive heat input causing the first fastener 11 near the joint to burn out.

[0100] In this embodiment, when the welding method used is a single-sided welding method such as laser welding or plasma arc welding, the geometric center line of the weld nugget 103 should be kept as coaxial as possible with the center line of the welded part 131 (or the center line of the thinned cavity 130), and the allowable coaxiality deviation should not exceed 1.0 mm.

[0101] Understandably, when the welding method used is a single-sided welding method such as laser welding or plasma arc welding, it is necessary to control the overall welding heat input and adopt short-time, high-parameter welding specifications to reduce heat dissipation from the molten area to the surrounding first fixing member 11, so as to avoid burning of the first fixing member 11 near the joint.

[0102] In other embodiments, the centerline of the welding electrode used is kept coaxial with the centerline of the connector 13 (or the centerline of the thinned cavity 130), with an allowable coaxiality deviation of no more than 1.0 mm.

[0103] In this embodiment, when the welding method used is resistance spot welding, the inner diameter (diameter of the nail foot inner hole) D1 of the side wall 1312 along the second direction R needs to be more than 1.5 mm higher than the diameter of the welding head 3 used. At the same time, the coaxiality deviation between the center line of the welding head 3 and the center line of the connector 13 (or the center line of the thinned cavity 130) is controlled to avoid the welding head 3 contacting the inner surface of the side wall 1312, causing flow diversion or causing the side wall 1312 of the welding part 131 to be melted by resistance heating.

[0104] In this embodiment, when the welding method used is resistance spot welding, a boss structure 14 for contacting the second fixing member 12 to form a weld nugget 103 can be provided on the lower side of the bottom wall 1311 (further combined with...). Figure 5 As shown), the thickness of the boss structure 14 along the first direction F is controlled to be between 0.2 and 0.3 mm, and the diameter of the boss structure 14 along the second direction R does not exceed the inner diameter D1 of the sidewall 1312 along the second direction R.

[0105] Understandably, when resistance spot welding is used, it is necessary to control the overall welding heat input and enhance the heat dissipation and cooling effect of the welding torch. At the same time, short-time, high-parameter welding specifications should be adopted to reduce heat dissipation from the weld nugget 103 area to the surrounding first fixing member 11. Meanwhile, when using single-sided welding methods such as laser welding or plasma arc welding, the lower surface of the bottom wall 1311 should be kept flat.

[0106] In one embodiment, the number of the first fixing member 11 and the second fixing member 12 can be one or more; the first fixing member 11 and / or the second fixing member 12 can both be provided with receiving grooves 101, but at least one second fixing member 12 should have a solid area 102 without holes, and the at least one second fixing member 12 with a solid area 102 is located on the outermost edge side of the stacked structure of the first fixing member 11 and the second fixing member 12 along the first direction F, so that it can be laser welded.

[0107] In one embodiment, the number of first fasteners 11 is one or more, and the one or more first fasteners 11 are stacked along the first direction F. At least one solid area 102 is exposed via a receiving groove 101. The number of second fasteners 12 is one or more, and the one or more second fasteners 12 are stacked along the first direction F on the same side of the one or more first fasteners 11. The weld nugget 103 is disposed through the one or more second fasteners 12 along the first direction F.

[0108] In one embodiment, there are one or more first fasteners 11 and a plurality of second fasteners 12. At least one of the plurality of second fasteners 12 is provided with a solid area 102. At least one of the plurality of second fasteners 12 includes a receiving groove 101 disposed therethrough along a first direction F. The receiving groove 101 of one or more first fasteners 11 communicates with the receiving groove 101 of at least one other second fastener 12 along the first direction F and exposes the solid area 102.

[0109] In one possible implementation, there are multiple first fasteners 11, each with a receiving groove 101, and the multiple receiving grooves 101 are coaxially arranged, with the connector 13 passing through the multiple receiving grooves 101. A second fastener 12 has a solid area 102 located at the outermost edge away from the connector 13 and is welded to the connector 13, with the weld nugget 103 located in the solid area 102 of the second fastener 12.

[0110] In another possible implementation, there is one first fastener 11 with a receiving groove 101 through which the connector 13 passes. There are multiple second fasteners 12, which are stacked on the outermost edge away from the connector 13 and are all welded to the connector 13. The weld nugget 103 is located in the solid area 102 of the multiple second fasteners 12.

[0111] In another possible implementation, there are multiple first fasteners 11, each with a receiving groove 101. The multiple receiving grooves 101 are coaxially arranged, and the connector 13 passes through the multiple receiving grooves 101. There are multiple second fasteners 12, which are stacked on the outermost edge away from the connector 13 and are all welded to the connector 13. The weld nugget 103 is located in the solid area 102 of the multiple second fasteners 12.

[0112] In another possible implementation, there is one first fixing member 11 with a receiving groove 101, and multiple second fixing members 12, with the receiving groove 101 on the middle second fixing member 12. The multiple receiving grooves 101 are coaxially arranged, and the connector 13 passes through the multiple receiving grooves 101. One second fixing member 12 is located at the outermost edge away from the connector 13 and is welded to the connector 13.

[0113] In another possible implementation, there are multiple first fasteners 11, each with a receiving groove 101. There are also multiple second fasteners 12, with the receiving groove 101 on the middle second fastener 12. The multiple receiving grooves 101 are coaxially arranged, and the connector 13 passes through the multiple receiving grooves 101. One second fastener 12 has a solid area 102 located at the outermost edge away from the connector 13 and is welded to the connector 13.

[0114] Further integration Figure 6 As shown, in other embodiments, the connector 13 may further include reinforcing ribs 133, which are distributed within the thinned cavity 130 and connected to the sidewall 1312 and the bottom wall 1311 to enhance the load-bearing capacity of the welded portion 131. There may be multiple reinforcing ribs 133, and each reinforcing rib may have a generally triangular cross-section.

[0115] Further integration Figure 7 As shown, in other embodiments, the cross-sectional shape of the sidewall 1312 can be approximately trapezoidal, wherein the side of the sidewall 1312 connected to the bottom wall 1311 is narrower, and the side of the sidewall 1312 connected to the fixing part 132 is wider, in order to enhance the load-bearing capacity of the sidewall 1312.

[0116] In this embodiment, the outer periphery of the end of the welding part 131 that connects to the fixing part 132 may be provided with a transition rounded corner structure 134, which surrounds the side wall 1312; the outer diameter of the transition rounded corner structure 134 gradually increases along the first direction F from the side closer to the fixing part 132.

[0117] Understandably, the transition fillet structure 134 is located at the transition between the fixing part 132 and the welding part 131 to avoid stress concentration. At the same time, the radius R1 of the transition fillet structure 134 should not be too large to avoid squeezing and damaging the first fixing member 11 during the embedding process, which would impair the load-bearing capacity of the connection structure; specifically, the radius R1 of the transition fillet structure 134 should be controlled between 0.1 mm and 0.5 mm.

[0118] Further integration Figure 8 As shown, in other embodiments, the fixing part 132 can be a round head structure, with the side of the fixing part 132 away from the bottom wall 1311 protruding and having an arc-shaped surface to enhance the load-bearing capacity of the fixing part 132.

[0119] Further integration Figure 9 As shown, other embodiments of this application also provide a vehicle 2, which includes a main body 21 and a fixed connection structure 10 as described in any of the foregoing embodiments, the fixed connection structure 10 being mounted on the main body 21.

[0120] The main body 21 includes, but is not limited to, the vehicle frame, engine assembly, transmission assembly, battery pack assembly, and other structures of the vehicle 2, which will not be described in detail here.

[0121] Understandably, the vehicle 2 of this application has a fixed connection structure 10, which not only ensures the connection strength of the vehicle 2, but also reduces the manufacturing difficulty of the vehicle 2.

[0122] The specific embodiments of this application have been described above with reference to the accompanying drawings. However, those skilled in the art will understand that various changes and substitutions can be made to the specific embodiments of this application without departing from the spirit and scope of this application. All such changes and substitutions fall within the scope defined by this application.

Claims

1. A fixed connection structure characterized by comprising: include: The first fastener includes a receiving groove that extends through the first direction; The second fastener includes a solid area without openings. The first fastener and the second fastener are stacked together along the first direction. The receiving groove and the spatial projection of the solid area along the first direction at least partially overlap. A connector that connects the first fixing member and the second fixing member, the connector including a welding part, the welding part being disposed in the receiving groove and the bottom wall of the welding part being connected to the solid area; the welding part including a thinning cavity, the thinning cavity being located on the side of the bottom wall away from the solid area, for thinning the bottom wall.

2. The fixed connection structure according to claim 1, wherein The connector is welded to the solid area to form a weld nugget, and the outer diameter of the weld nugget's spatial projection along the first direction is smaller than the inner diameter of the bottom wall and / or the receiving groove's spatial projection along the first direction.

3. The fixed connection structure according to claim 2, wherein The weld nugget extends within the bottom wall along the first direction and extends from the bottom wall to the solid area; or, The weld nugget is disposed through the second fixing member along the first direction and extends from the solid area to the bottom wall; or, The weld nugget is disposed along the first direction, penetrating the bottom wall and the second fixing member.

4. The fixed connection structure as described in claim 2, characterized in that, The projection of the outer edge of the weld nugget along the first direction is located inside the projection of the outer edge of the welded portion along the first direction.

5. The fixed connection structure according to Claim 1, wherein The welding part is in the shape of a rotating body, and the welding part also includes an annular sidewall. The bottom wall is connected to the sidewall and is located on one side of the sidewall along the first direction. The sidewall and the bottom wall enclose the thinning cavity. The sidewall is disposed towards the inner wall of the receiving groove and is used to abut or connect with the first fixing member. The bottom wall is disposed with the solid area along the first direction towards the side where the first fixing member is located.

6. The fixed connection structure according to claim 5, wherein The first fastener is plate-shaped, the thickness of the first fastener along the first direction is L1, the thickness of the bottom wall along the first direction is L4, and the thickness of the side wall along the second direction perpendicular to the first direction is L5. Among them, the ratio of L4 to L1 is in the range of 0.5 to 1.0, and / or the ratio of L5 to L1 is in the range of 0.5 to 1.

0.

7. The fixed connection structure according to Claim 5, wherein The connector further includes a fixing part, which is connected to the side wall and located on the side of the side wall away from the bottom wall. The outer diameter of the fixing part is larger than the outer diameter of the welding part. The fixing part is spaced apart from the solid area along the first direction and is used to engage or abut with the first fixing member.

8. The fixed connection structure according to claim 7, wherein The fixing part is annular and surrounds the welding part. The bottom wall is exposed through the thinned cavity on the side away from the solid area.

9. The fixed connection structure as described in claim 2, characterized in that: The number of the first fasteners is one or more, and the one or more first fasteners are stacked along the first direction, with at least one of the solid areas exposed via the receiving groove; the number of the second fasteners is one or more, and the one or more second fasteners are stacked along the first direction on the same side of the one or more first fasteners; the weld nugget is disposed through the one or more second fasteners along the first direction; or... The number of the first fasteners is one or more, the number of the second fasteners is multiple, at least one of the multiple second fasteners is provided with the solid area, at least another of the multiple second fasteners includes the receiving groove disposed therethrough along the first direction, the receiving groove of one or more first fasteners communicates with the receiving groove of at least another second fastener along the first direction and exposes the solid area.

10. A vehicle characterized by comprising: include: Main body; as well as The fixed connection structure as described in any one of claims 1 to 9 is installed on the main body.

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