Body structure

Abstract

This utility model provides a vehicle body structure. The vehicle body structure includes body frame members extending along the length of the vehicle on both sides in the width direction; and body component members with vehicle identification codes extending along the width direction and connecting the body frame members on both sides to each other. The body frame members and the body component members are fastened together by decapitation bolts, and the heads of the decapitation bolts are removed while the body frame members and body component members are fastened together. Based on the above structure of this utility model, the disassembly difficulty of the body component members with vehicle identification codes is increased.

Description

Technical Field

[0001] This utility model relates to a vehicle body structure, and in particular to a countermeasure that increases the difficulty of disassembling vehicle body components with vehicle identification codes. Background Technology

[0002] Typically, the vehicle body carries a Vehicle Identification Number (VIN) as an inherent identification code (an individual identification code assigned to each vehicle). Generally, this VIN is directly engraved on the vehicle body components.

[0003] Compared to other body components, body components engraved with Vehicle Identification Numbers (VINs) must be difficult to remove from the vehicle. This is to prevent unauthorized removal and installation of VIN-engraved body components on other vehicles (such as stolen cars). Therefore, to improve the effectiveness of preventing such illegal activities, a body structure that increases the difficulty of removing body components is needed. Utility Model Content

[0004] In view of the above situation, the purpose of this utility model is to provide a body structure that increases the difficulty of disassembling body components engraved with vehicle identification codes.

[0005] As a technical solution to the above-mentioned technical problems, the present invention provides a vehicle body structure, which includes a vehicle frame component extending along the vehicle length direction on both sides in the vehicle width direction; and a vehicle body component with a vehicle identification code extending along the vehicle width direction and connecting the vehicle frame components on both sides to each other. The vehicle body frame component and the vehicle body component are fastened together by a decapitation bolt, and the head of the decapitation bolt is removed when the vehicle frame component and the vehicle body component are fastened together by the decapitation bolt.

[0006] Based on the above-described structure of this invention, the difficulty of disassembling body components bearing (e.g., engraved) vehicle identification codes can be increased. Specifically, since the body frame component and the body component are fastened together by decapitation bolts, the heads of these bolts are removed while the body frame component and the body component are fastened together, making them difficult to loosen. Therefore, the difficulty of disassembling body components bearing vehicle identification codes can be increased.

[0007] In addition, in the above-mentioned vehicle body structure of this utility model, it is preferred that the vehicle body frame component has a side beam and a connecting bracket fastened to the side beam, the vehicle body component is a crossbeam, and the connecting bracket and the crossbeam are fastened together by the decapitation bolt.

[0008] That is, the side beams are connected to the crossbeams via connecting brackets. Based on this structure, compared with the structure in which the side beams are directly connected to the crossbeams, the degree of freedom in the shape of the side beams and crossbeams can be increased.

[0009] In addition, in the above-described vehicle body structure of this utility model, it is preferred that the side beam adopts a rectangular closed cross-section structure, the connecting bracket has a horizontal part parallel to the top plate of the side beam, and a vertical part parallel to the inner sidewall part located on the inner side of the side beam in the vehicle width direction. The inner sidewall part of the side beam and the vertical part of the connecting bracket are also fastened together by a decapitation bolt. Furthermore, when the inner sidewall part and the vertical part are fastened together by the decapitation bolt, the head of the decapitation bolt is removed.

[0010] Based on this structure, the connecting bracket and the crossbeam, as well as the connecting bracket and the side beam, are fastened together by decapitation bolts, which further increases the difficulty of disassembling the body component (crossbeam) with the vehicle identification code.

[0011] In addition, in the above-mentioned vehicle body structure of this utility model, it is preferred that the side beam and the connecting bracket are bonded by an adhesive component.

[0012] Based on this structure, the bonding strength between the side beam and the connecting bracket is improved due to the adhesive, thereby increasing the difficulty of removing the connecting bracket from the side beam. As a result, removing the crossbeam and connecting bracket together from the side beam is also very difficult, thus significantly increasing the difficulty of disassembling the body component (crossbeam) with the vehicle identification number.

[0013] In addition, in the above-mentioned vehicle body structure of this utility model, it is preferred that the vehicle body frame component is the front pillar and the vehicle body component is the front bulkhead.

[0014] Based on this structure, the difficulty of disassembling the front bulkhead increases when a vehicle identification code is engraved on it. Therefore, it increases the difficulty of disassembling body components with vehicle identification codes. Attached Figure Description

[0015] Figure 1 This is a perspective view of the vehicle body structure illustrating an embodiment of the present invention.

[0016] Figure 2 This is a perspective view showing a portion of the vehicle body structure used to illustrate the fastening connection operation of the side beam, seat crossbeam, connecting bracket, and battery pack in an embodiment of the present invention.

[0017] Figure 3 This is a perspective view showing the connecting bracket in an embodiment of the present invention.

[0018] Figure 4This is a perspective view showing the decapitation bolt in an embodiment of this utility model.

[0019] Figure 5 This is a perspective view showing a portion of the vehicle body structure in an embodiment of the present invention, after the side beam, seat crossbeam, connecting bracket, and battery pack are securely connected.

[0020] Figure 6 This is a perspective view showing a portion of the vehicle body structure in a modified embodiment of the present invention, after the front fender, front bulkhead, and front pillar are fastened together. Detailed Implementation

[0021] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In this embodiment, the application of the present invention to the body structure of an electric vehicle will be described. However, the body structure involved in the present invention is not limited to electric vehicles, but is also applicable to conventional automobiles (automobiles equipped only with an engine as a drive source), hybrid electric vehicles, plug-in hybrid electric vehicles, and fuel cell vehicles.

[0022] <Body Structure>

[0023] Figure 1 This is a perspective view showing the vehicle body structure 1 of this embodiment. Figure 1 In the diagram, arrow FR indicates the front side in the vehicle length direction, arrow UP indicates the upper side in the vehicle height direction, and arrow LH indicates the left side in the vehicle width direction. For example... Figure 1 As shown, the vehicle body structure 1 of this embodiment includes a front lower module 2, a rear lower module 3, and a central frame 4. Furthermore, these front lower modules 2, rear lower modules 3, and central frame 4 are assembled into a single unit.

[0024] Specifically, the rear end of the front lower module 2 is assembled to the front end of the central frame 4, and the front end of the rear lower module 3 is assembled to the rear end of the central frame 4. The specific assembly structure will be described later.

[0025] Additionally, a battery pack 5 is positioned below the central frame 4. The electrical energy stored in this battery pack 5 is used to power the motor (not shown) that drives the vehicle (electric vehicle). Here, the battery pack 5 is constructed by housing the battery modules within a battery box.

[0026] The front lower module 2 and the rear lower module 3 are formed using so-called giga-casting. Giga-casting refers to the processing technology used to form large die-cast aluminum components.

[0027] In the front lower module 2, which is formed by gigabit-level die casting, the various components that constitute the front lower part of the conventional vehicle body structure are formed into one piece. Specifically, the front lower module 2 includes the front side beam part 21, the suspension tower part 22, the wheel well panel component part 23, and the front crossbeam part 24, etc. However, the structure of the front lower module 2 is not limited to this.

[0028] In addition, the rear end portion of each front side beam portion 21 serves as a rear end connection portion 25 and is connected to the front end portion of the side beam 41 of the central frame 4 by bolts.

[0029] Similarly, in the rear lower module 3, which is formed by gigabit-level die casting, the various components constituting the rear lower part of the conventional vehicle body structure are also molded as a single unit. Specifically, the rear lower module 3 includes the rear side beam 31, the rear cross beam 32, the suspension tower 33, the wheel well panel component 34, and the rear floor component 35, etc. However, the structure of the rear lower module 3 is not limited to this.

[0030] In addition, the front end of each rear side beam portion 31 serves as a front end connecting portion 36 and is connected to the rear end portion of the side beam 41 of the central frame 4 by bolts.

[0031] The central frame 4 is configured as a frame, including a pair of left and right side beams (side beams) 41 extending along the vehicle length direction on both sides in the vehicle width direction; a front crossbeam 42 extending along the vehicle width direction and connecting the front end of the left side beam 41 to the front end of the right side beam 41; and a rear crossbeam 43 extending along the vehicle width direction and connecting the rear end of the left side beam 41 to the rear end of the right side beam 41.

[0032] Each side beam 41, front crossbeam 42, and crossbeam 43 is configured with a rectangular cross-section, i.e., a closed cross-section, thus ensuring sufficiently high rigidity. Furthermore, the side beam 41 is made of an aluminum-containing alloy or aluminum. However, the material of the side beam 41 is not limited to these.

[0033] As a fastening connection structure between the front lower module 2 and the center frame 4, the outer side (the outer side facing the vehicle width direction) of the rear connecting part 25 of the front lower module 2 overlaps with the inner side (the inner side facing the vehicle width direction) of the side beam 41 of the center frame 4 and is fastened together by multiple bolts B1.

[0034] Similarly, the fastening connection between the rear lower module 3 and the central frame 4 is also such that the outer side of the front connecting part 36 of the rear lower module 3 overlaps with the inner side of the side beam 41 of the central frame 4 and is fastened together by multiple bolts B2.

[0035] In addition, the left and right side beams 41 of the central frame 4 are connected to each other by two seat crossbeams (the crossbeams referred to in this utility model). Specifically, the two ends of each seat crossbeam (6, 7) are connected to the side beam 41 via connecting brackets 8. Therefore, the side beams 41 and the connecting brackets 8 constitute the body frame component (the body frame component extending along the length direction on both sides in the width direction of the vehicle) as described in this utility model. Each seat crossbeam (6, 7) is made of an iron-containing alloy or iron. However, the material of each seat crossbeam (6, 7) is not limited to these. Hereinafter, the connection method will be described with the connection structure between one end of the seat crossbeam 6 located on the rear side in the length direction of the two seat crossbeams (6, 7) and the side beam 41 as an example.

[0036] Figure 2 This is a perspective view of a part of the vehicle body structure 1 used to illustrate the fastening connection operation of the side beam 41, seat crossbeam 6, connecting bracket 8, and battery pack 5 (the operation of connecting the right end of the seat crossbeam 6 in the vehicle width direction to the side beam 41 via the connecting bracket 8).

[0037] like Figure 2 As shown, in the mounting portion of the seat crossbeam 6 on the side beam 41, five bolt insertion holes 41f are formed at five locations on the top plate 41e, penetrating the top plate 41e. Additionally, in the mounting portion of the seat crossbeam 6 on the side beam 41, three bolt insertion holes 41g are formed at three locations on the inner sidewall portion 41b, penetrating the inner sidewall portion 41b. Figure 2 (One of the three bolt insertion holes 41g is not shown). Each bolt insertion hole 41f and each bolt insertion hole 41g is used for fastening connection with the connecting bracket 8. In addition, double-sided adhesive tape (the adhesive component mentioned in this utility model) 41h is attached to the upper surface of the top plate 41e.

[0038] The seat crossbeam 6 is configured with a rectangular closed cross-section or a rectangular cross-section with an open lower side. Furthermore, the length of the seat crossbeam 6 is the same as or slightly smaller than the spacing between the pair of side beams 41. The vehicle identification number (VN) is engraved on the upper surface of the top plate 61 of the seat crossbeam 6. Therefore, the seat crossbeam 6 is equivalent to the vehicle body component (vehicle body component with VN) described in this invention. In this embodiment, the VN is engraved (stamped) on the upper surface of the top plate 61 of the seat crossbeam 6 while the oxide film on the upper surface is not removed. Furthermore, the VN is engraved only on one of the two seat crossbeams (6, 7). In this embodiment, the VN is engraved on the seat crossbeam 6 located at the rear in the vehicle length direction. Additionally, a transparent tape 64 is affixed to the upper surface of the top plate 61 of the seat crossbeam 6, covering the area where the vehicle identification code (VN) is engraved. This is to prevent water (rainwater, etc.) from flowing onto the engraved part of the VN and corroding the upper surface of the top plate 61, thus causing the VN to become blurred.

[0039] Additionally, bolt insertion holes 62 and 63 are formed at multiple locations on the top plate 61 of the seat crossbeam 6, penetrating the top plate 61. Of these bolt insertion holes 62 and 63, the two bolt insertion holes 62 located on the outer side in the vehicle width direction are used for fastening to the connecting bracket 8. The bolt insertion holes 63 located further in the vehicle width direction than the bolt insertion holes 62 are used to fix the battery pack 5. Figure 2 In the diagram, only one location is shown as the formation site of the bolt insertion hole 63, but bolt insertion holes 63 are formed at multiple locations on the top plate 61 of the seat crossbeam 6.

[0040] Figure 3 This is a perspective view showing the connecting bracket 8 located at the rear in the vehicle length direction. The connecting bracket 8 located at the front in the vehicle length direction also has the same structure, so only the connecting bracket 8 located at the rear in the vehicle length direction will be described here.

[0041] like Figure 2 and Figure 3 As shown, the connecting bracket 8 is fastened to the side beam 41 and the seat crossbeam 6 by bolts, thus serving as the component connecting the side beam 41 and the seat crossbeam 6 (see reference). Figure 5 ).

[0042] The connecting bracket 8 has a first horizontal portion 81 that overlaps with the upper surface of the top plate 41e of the side beam 41, a vertical portion 82 that overlaps with the inner side surface (the inner side facing the vehicle width direction) of the inner wall portion 41b of the side beam 41, a second horizontal portion 83 that overlaps with the upper surface of the top plate 61 of the seat crossbeam 6, and a third horizontal portion 83 that overlaps with the rear plate 65 of the seat crossbeam 6 (see reference). Figure 2 The rear vertical portion 84 overlaps with the rear surface of the seat crossbeam 6 and the front vertical portion 85 overlaps with the front surface of the front plate 66 of the seat crossbeam 6.

[0043] The first horizontal section 81 is composed of an approximately rectangular plate member. At five locations on the first horizontal section 81, bolt insertion holes 81a are formed that penetrate the first horizontal section 81 and correspond to the bolt insertion holes 41f of the side beam 41.

[0044] The vertical portion 82 is formed by bending the end of the first horizontal portion 81 located on the inner side in the vehicle width direction downward. Furthermore, both sides of the vertical portion 82 in the vehicle length direction have a downwardly extending lower portion 82a, and each of the two lower portions 82a has a bolt insertion hole 82b that corresponds to the bolt insertion hole 41g of the side beam 41 and penetrates the lower portion 82a.

[0045] The second horizontal portion 83 is formed by extending a predetermined dimension from the lower end of the vertical portion 82 between the two vertical portions 82a in the vehicle width direction. At two locations of the second horizontal portion 83 (two locations spaced apart by a predetermined interval in the vehicle length direction), bolt insertion holes 83a are formed, which correspond to the bolt insertion holes 62 of the seat crossbeam 6 and penetrate the second horizontal portion 83.

[0046] The spacing between the rear vertical portion 84 and the front vertical portion 85 is approximately the same as the length dimension (i.e., width dimension) of the seat crossbeam 6. That is, the space enclosed by the second horizontal portion 83, the rear vertical portion 84, and the front vertical portion 85 constitutes a fitting space that approximately matches the side view shape of the seat crossbeam 6. Therefore, with the second horizontal portion 83 overlapping the upper surface of the top plate 61 of the seat crossbeam 6, the rear vertical portion 84 abuts against the rear surface of the rear plate 65 of the seat crossbeam 6, and the front vertical portion 85 abuts against the front surface of the front plate 66 of the seat crossbeam 6, thus forming a structure that clamps the end of the seat crossbeam 6 between the rear vertical portion 84 and the front vertical portion 85 (see reference). Figure 5 ).

[0047] The feature of this embodiment is that two different types of bolts are used as bolts for fastening the connecting bracket 8 to the side beam 41 and bolts for fastening the connecting bracket 8 to the seat crossbeam 6.

[0048] Specifically, the bolts B3 inserted into the bolt insertion holes 81a of the connecting bracket 8 and through the bolt insertion holes 41f of the side beam 41 to securely connect the connecting bracket 8 to the side beam 41 are ordinary bolts, that is, bolts with a head and a threaded portion, whose heads will not be cut off from the threaded portion when the connecting bracket 8 and the side beam 41 are securely connected. Similarly, the bolts B5 inserted into the bolt insertion holes 63 of the seat beam 6 and screwed into the threaded holes formed on the battery pack 5 (e.g., the bracket located on the upper part of the battery pack 5) to fix the battery pack 5 to the seat crossbeam 6 are also ordinary bolts, that is, bolts with a head and a threaded portion, whose heads will not be cut off from the threaded portion when the battery pack 5 is fixed to the seat crossbeam 6.

[0049] However, the bolts 9A inserted from the bolt insertion hole 82b of the connecting bracket 8 and passing through the bolt insertion hole 41g of the side beam 41, and the bolts 9B inserted from the bolt insertion hole 83a of the connecting bracket 8 and passing through the bolt insertion hole 62 of the seat beam 6, are all decapitated bolts, in order to securely connect the connecting bracket 8 to the seat crossbeam 6.

[0050] Figure 4 This is a 3D diagram representing the decapitation bolt 9A. (For example...) Figure 4 As shown, the decapitation bolt 9A has a shaft portion 91, a flange portion 92, and a head 93. External threads are formed on the outer circumferential surface of the shaft portion 91. One end of the flange portion 92 is connected to the rear end of the shaft portion 91 and is configured as an approximately conical shape (trapezoidal cross-section) with a larger outer diameter closer to the shaft portion 91. The other end of the flange portion 92 (the end with the smaller outer diameter) is connected to the head 93. The head 93 is approximately hexagonal prism in shape. When tightening the decapitation bolt 9A, the head 93 can be clamped using a tool (such as a wrench). Based on this structure of the decapitation bolt 9A, when the connecting bracket 8 is fastened to the side beam 41, after the connecting bracket 8 and the side beam 41 are fastened together by the decapitation bolt 9A, a larger torque is applied to the head 93 of the decapitation bolt 9A, causing the narrowing portion 94 between the head 93 and the flange portion 92 to break, thus removing the head 93. After the head 93 is removed, the decapitation bolt 9A becomes difficult to loosen.

[0051] Furthermore, the decapitation bolt 9B has the same structure. When the connecting bracket 8 is fastened to the seat crossbeam 6, after the connecting bracket 8 and the seat crossbeam 6 are fastened together by the decapitation bolt 9B, the head 93 can be removed by applying a greater torque to the head 93, causing the narrowing portion 94 between the head 93 and the flange portion 92 to break. After the head 93 is removed, the decapitation bolt 9B becomes difficult to loosen.

[0052] Assembly Operation

[0053] The following describes the assembly operation of fastening the side beam 41, seat crossbeam 6, connecting bracket 8, and battery pack 5 together. The assembly operation of fastening these components (41, 6, 8, 5) together is performed after the rear end of the front lower module 2 is assembled to the front end of the central frame 4 and the front end of the rear lower module 3 is assembled to the rear end of the central frame 4.

[0054] When performing the assembly operation of fastening the side beam 41, seat crossbeam 6, connecting bracket 8, and battery pack 5 together, firstly, the battery pack 5 is assembled with the seat crossbeams (6, 7). That is, the seat crossbeams (6, 7) are positioned at a predetermined location on the upper surface of the battery pack 5, and bolts B5 are inserted into bolt insertion holes 63 formed on the top plate 61 of the seat crossbeams (6, 7). By screwing the bolts B5 into the female threaded holes of the brackets provided on the upper part of the battery pack, the battery pack 5 and the seat crossbeams (6, 7) are assembled together. However, the assembly structure of the battery pack 5 and the seat crossbeams (6, 7) is not limited to this.

[0055] Then, the connecting bracket 8 is installed on the side beam 41. Specifically, the first horizontal portion 81 of the connecting bracket 8 overlaps with the upper surface of the top plate 41e of the side beam 41, while the vertical portion 82 of the connecting bracket 8 overlaps with the inner side wall portion 41b of the side beam 41. At this time, the double-sided tape 41h pasted on the upper surface of the top plate 41e of the side beam 41 will adhere to the lower surface of the first horizontal portion 81 of the connecting bracket 8, thereby bonding the side beam 41 and the connecting bracket 8 together through the double-sided tape 41h.

[0056] Furthermore, when the various parts of the connecting bracket 8 (the first horizontal part 81 and the vertical part 82) overlap with the side beam 41 as described above, the bolt insertion holes 81a of the connecting bracket 8 should be aligned with the bolt insertion holes 41f of the side beam 41, and the bolt insertion holes 82b of the connecting bracket 8 should be aligned with the bolt insertion holes 41g of the side beam 41. In this state, by inserting the bolt B3 into the bolt insertion holes 81a and 41f and tightening it onto the nut (not shown), the first horizontal part 81 of the connecting bracket 8 is securely connected to the top plate 41e of the side beam 41. Subsequently, by inserting the decapitating bolt 9A into the bolt insertion holes 82b and 41g and tightening it onto the nut (not shown), the vertical part 82 of the connecting bracket 8 is securely connected to the inner wall part 41b of the side beam 41. After assembling the connecting bracket 8 onto the side beam 41 using the decapitation bolt 9A, a greater torque is applied to the head 93 of the decapitation bolt 9A to break off the narrowed portion 94, and then the head 93 is removed. Thus, the decapitation bolt 9A becomes... Figure 5 It is in a state that is difficult to loosen, as shown in the picture.

[0057] Then, the seat crossbeams (6, 7) that are assembled with the battery pack 5 are fastened to the connecting bracket 8. The fastening operation is described with the seat crossbeam 6 as an example. The same operation is performed on the seat crossbeam 7 to fasten it to the connecting bracket (the front connecting bracket) 8.

[0058] From the lower side of the central frame 4, the seat crossbeam 6, which is assembled integrally with the battery pack 5, is inserted into the inner space of the central frame 4 (the space between the two side beams 41), and the end of the seat crossbeam 6 in the vehicle width direction is embedded in the aforementioned fitting space of the connecting bracket 8 (the space surrounded by the second horizontal part 83, the rear vertical part 84, and the front vertical part 85). That is, at the end of the seat crossbeam 6 in the vehicle width direction, the upper surface of the top plate 61 abuts against the lower surface of the second horizontal part 83 of the connecting bracket 8, the rear surface of the rear plate 65 of the seat crossbeam 6 abuts against the front surface (the front side facing the vehicle length direction) of the rear vertical part 84 of the connecting bracket 8, and the front surface of the front plate 66 of the seat crossbeam 6 abuts against the rear surface (the rear side facing the vehicle length direction) of the front vertical part 85 of the connecting bracket 8. At this time, the bolt insertion hole 83a of the connecting bracket 8 and the bolt insertion hole 62 of the seat crossbeam 6 are aligned. Then, by inserting the decapitating bolt 9B into the bolt insertion holes 83a and 62 and tightening it onto the nut, the seat crossbeam 6 is securely connected to the second horizontal portion 83 of the connecting bracket 8. Thus, the seat crossbeam 6 is connected to the side beam 41 via the connecting bracket 8. After the seat crossbeam 6 is assembled onto the connecting bracket 8 using the decapitating bolt 9B, a greater torque is applied to the head 93 of the decapitating bolt 9B to break off the narrowed portion 94, and the head 93 is removed. Thus, the decapitating bolt 9B becomes... Figure 5 It is in a state that is difficult to loosen, as shown in the picture.

[0059] Through the above assembly operations, the front lower module 2, rear lower module 3, central frame 4, seat crossbeams (6, 7), and battery pack 5 can be assembled into a single body structure 1.

[0060] <Effects of the Implementation Method>

[0061] As described above, in this embodiment, in the fastening connection structures between the connecting bracket 8 and the side beam 41, and between the seat crossbeam 6 and the connecting bracket 8, decapitated bolts 9A and 9B with removable heads 93 are used respectively. After the fastening connection is achieved, the heads of each of the decapitated bolts 9A and 9B are removed. Since the decapitated bolts 9A and 9B with their heads removed are difficult to loosen, the difficulty of disassembling the seat crossbeam 6 is increased. That is, the difficulty of disassembling the seat crossbeam 6, which is engraved with the vehicle identification code VN, is increased. As a result, the illegal use of the seat crossbeam 6 after disassembly can be effectively prevented.

[0062] Furthermore, in this embodiment, the side beam 41 and the connecting bracket 8 are not only fastened together with bolts, but also bonded together with double-sided adhesive tape 41h. Therefore, the bonding strength between the side beam 41 and the connecting bracket 8 is increased due to the adhesive, further increasing the difficulty of disassembling the connecting bracket 8 from the side beam 41. Consequently, removing the seat crossbeam 6 and the connecting bracket 8 as a single unit from the side beam 41 is also very difficult. Therefore, the difficulty of disassembling the seat crossbeam 6, which is engraved with the vehicle identification code VN, is significantly increased.

[0063] <Variation Example>

[0064] The following describes a variation of this utility model. This variation shows that when a vehicle identification code is engraved on the front bulkhead, the difficulty of disassembling the front bulkhead can be increased.

[0065] Figure 6 This is a perspective view showing a portion of the vehicle body structure in this modified example, after the front fender 100, front bulkhead (equivalent to the vehicle body component in this invention) 110, and front pillar (equivalent to the vehicle body frame component in this invention) 120 are fastened together. Figure 6 Similarly, arrow FR indicates the front side in the vehicle length direction, arrow UP indicates the upper side in the vehicle height direction, and arrow LH indicates the left side in the vehicle width direction. Figure 6 The diagram only shows the structure around the right end of the front bulkhead 110 extending in the vehicle width direction; the structure around the left end of the front bulkhead 110 in the vehicle width direction is the same.

[0066] like Figure 6 As shown, in the vehicle body structure 1 of this modified example, the front fender 100, the front bulkhead 110, and the front pillar 120 are fastened together by decapitation bolts 9. Specifically, the end of the front bulkhead 110 overlaps the upper surface of the front fender 100. Figure 6 The front end of the front pillar 120 overlaps the upper side of the end of the front bulkhead 110 (the right end in the vehicle width direction). With these components (100, 110, 120) overlapping, their respective bolt insertion holes (not shown) are connected. The decapitation bolt 9 is inserted into these bolt insertion holes and tightened onto the nut, thereby securing the components (100, 110, 120) together. After securing the components (100, 110, 120) together, the head of the decapitation bolt 9 is removed.

[0067] Therefore, based on the structure of this modified example, it can also effectively prevent the illegal use of the front bulkhead 110, which is a body component with a vehicle identification code engraved on it, after it has been removed.

[0068] <Other Implementation Methods>

[0069] This invention is not limited to the embodiments and variations described above, and appropriate modifications can be made. For example, in the above embodiment, the two seat crossbeams (6, 7) are respectively connected to the side beam 41 via connecting brackets 8, and a scissor bolt 9B is used as a fastening component between the seat crossbeams (6, 7) and the connecting brackets 8. However, this invention is not limited to this, and the scissor bolt 9B can also be used to fasten the seat crossbeam 6, which is engraved with the vehicle identification code VN, to the connecting bracket 8. That is, in the case of the above embodiment, the scissor bolt 9B is used to fasten the seat crossbeam 6 located on the rear side in the vehicle length direction to the connecting bracket 8. In addition, if the component engraved with the vehicle identification code VN is the seat crossbeam 7 located on the front side in the vehicle length direction, the scissor bolt 9B can also be used to fasten the seat crossbeam 7 located on the front side in the vehicle length direction to the connecting bracket 8.

[0070] Alternatively, the seat crossbeams (6, 7) can be directly connected to the side beams 41 using the chopping bolts 9B without using the connecting bracket 8.

[0071] Furthermore, the above embodiments describe the application of this invention to a vehicle body structure 1 employing a front lower module 2 and a rear lower module 3 formed by gigabit-level die casting. However, this invention is not limited to this and is also applicable to conventional vehicle body structures in which multiple components (e.g., pressed molded parts) are assembled into one piece by welding or fastening with bolts.

Claims

1. A vehicle body structure comprising body frame members extending along the length direction on both sides in the width direction; and a body component having a vehicle identification code, extending along the width direction and connecting the two body frame members to each other, characterized in that: The body frame component and the body component are fastened together by a decapitation bolt, and the head of the decapitation bolt is removed while the body frame component and the body component are fastened together by the decapitation bolt.

2. The vehicle body structure as described in claim 1, characterized in that: The vehicle body frame component includes side beams and connecting brackets that are fastened to the side beams. The vehicle body component is a crossbeam. The connecting bracket and the crossbeam are fastened together by the decapitation bolts.

3. The vehicle body structure as described in claim 2, characterized in that: The side beam adopts a rectangular closed section structure. The connecting bracket has a horizontal portion parallel to the top plate of the side beam and a vertical portion parallel to the inner wall portion located on the inner side of the side beam in the vehicle width direction. The inner sidewall of the side beam and the lower part of the connecting bracket are also fastened together by a decapitation bolt, and the head of the decapitation bolt is removed when the inner sidewall and the lower part are fastened together by the decapitation bolt.

4. The vehicle body structure as described in claim 2, characterized in that: The side beam and the connecting bracket are bonded together by adhesive components.

5. The vehicle body structure as described in claim 1, characterized in that: The vehicle body frame component is the front pillar. The body component is the front bulkhead.

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