Rear wall supporting structure and vehicle

Abstract

The utility model provides a rear wall supporting structure and a vehicle. The rear wall supporting structure comprises a middle channel which is arranged in a vehicle cabin and bulges upwards. The middle channel extends in the front-back direction of the whole vehicle, the rear end of the middle channel is connected with a rear wall plate in a vehicle cabin, a protruding part protruding upwards is arranged at the top of the rear end of the middle channel, and the protruding height of the protruding part is gradually increased in the front-back direction of the whole vehicle in the direction pointing to the rear wall plate. According to the rear wall supporting structure, the rear end of the middle channel is connected with the rear wall plate, the protruding part with the gradually-increased height is arranged at the top of the rear end of the middle channel, the rear wall plate can be well supported through the middle channel, especially the protruding part at the top of the middle channel, and when a vehicle collides backwards, the rear wall plate can be prevented from being damaged. And the rear panel is prevented from being broken and invading into the cabin, so that the collision safety of the whole vehicle is improved.

Description

Technical Field

[0001] This utility model relates to the field of vehicle technology, and in particular to a rear support structure; it also relates to a vehicle equipped with the rear support structure. Background Technology

[0002] The central tunnel on the front floor of a vehicle is a key and complex component of the vehicle interior. It not only provides support for passengers' feet and enhances their comfort, but also relates to the overall performance and safety of the vehicle.

[0003] Currently, in high-performance vehicles with low-slung, streamlined bodies, the rear end of the center tunnel on the front floor is generally connected to the rear bulkhead in a straight line without any styling design. While the existing connection method can achieve the connection between the center tunnel and the rear bulkhead, in the event of a collision, especially a rear-end collision, the rear bulkhead is prone to breakage and intrusion into the passenger compartment, which is detrimental to improving the overall vehicle's collision safety. Utility Model Content

[0004] In view of this, the present invention aims to propose a rear support structure to suppress the rear panel from breaking and intruding into the passenger compartment, thereby improving the safety of the vehicle in a collision.

[0005] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0006] A rear support structure includes an upwardly bulging central channel disposed in the vehicle cabin; the central channel extends along the longitudinal direction of the vehicle and the rear end of the central channel is connected to the rear panel in the vehicle cabin, and a first upwardly protruding part is provided at the top of the rear end of the central channel; in the longitudinal direction of the vehicle, the protrusion height of the first protrusion gradually increases along the direction pointing to the rear panel.

[0007] Furthermore, the top of the first protrusion is an inclined surface that slopes upwards and backwards towards the rear of the vehicle.

[0008] Furthermore, along the direction pointing towards the rear panel, the width of the first protrusion gradually decreases in the left-right direction of the vehicle.

[0009] Furthermore, the top of the central channel is provided with a reinforcing structure, and the reinforcing structure extends from the front end of the central channel to the rear end of the central channel.

[0010] Furthermore, the reinforcing structure includes a reinforcing block located at the rear end of the central channel and a reinforcing arm located in front of the reinforcing block; the reinforcing arm extends from the front end of the central channel to the rear end of the central channel and is connected to the reinforcing block, and the top of the reinforcing block is adapted to the top of the first protrusion and is gradually raised in the direction pointing to the rear panel.

[0011] Furthermore, the reinforcing arms are two arranged side by side in the left-right direction of the vehicle, and the two reinforcing arms are respectively located at the left and right edges of the top of the central channel.

[0012] Furthermore, the central channel is made of carbon fiber composite material and includes an upper central channel plate and a lower central channel plate connected together; a cavity is formed at the top of the central channel between the upper central channel plate and the lower central channel plate, and the reinforcing structure is formed by structural foam filling the cavity.

[0013] Compared with the prior art, this utility model has the following advantages:

[0014] The rear support structure described in this utility model is connected to the rear panel through the rear end of the central channel, and a first protrusion with gradually increasing height is provided at the top of the rear end of the central channel. The central channel, especially the first protrusion at its top, can provide good support for the rear panel, which can prevent the rear panel from breaking and intruding into the passenger compartment when the vehicle is involved in a rear collision, thus improving the safety of the entire vehicle in a collision.

[0015] Furthermore, the sloping top of the first protrusion enhances its support capabilities. The gradually decreasing width of the first protrusion along the left-right direction of the vehicle increases the support capacity at the rear of the center tunnel, improving its effectiveness in handling rear-end collisions. A reinforcing structure at the top of the center tunnel increases its overall rigidity, enhancing its support for the rear panel and its ability to transmit impact forces. This reinforcing structure, composed of reinforcing arms and blocks, is structurally simple, facilitating design and molding. The rear end being a reinforcing block, with its top fitting to the top of the first protrusion, also ensures effective support for the rear panel.

[0016] Furthermore, the two reinforcing arms arranged side-by-side allow for better reinforcement, further enhancing the stiffness and support capacity of the central tunnel. The central tunnel is made of carbon fiber composite material, leveraging its high stiffness and light weight to ensure its rigidity and improve the vehicle's lightweight profile. The cavity between the upper and lower plates of the central tunnel facilitates the arrangement of the reinforcing structure. Additionally, the use of structural foam in the reinforcement structure provides high strength and contributes to lightweight design.

[0017] In addition, another objective of this utility model is to provide a vehicle having a vehicle cabin, and the vehicle cabin having a rear support structure as described above.

[0018] Furthermore, a horizontally arranged platform structure is formed on the rear panel, the lower part of the rear panel is connected to the front side of the platform structure, and the upper part of the rear panel is connected to the rear side of the platform structure; the rear end of the central channel is connected to the lower part of the rear panel, and the platform structure is not lower than the central channel in the vertical direction of the vehicle.

[0019] Furthermore, the upper part of the rear panel has a second protrusion that bulges forward towards the front of the vehicle. From the vertical direction of the vehicle, the second protrusion is located behind the central tunnel; and / or, the rear panel is made of carbon fiber composite material.

[0020] The vehicle described in this utility model, by providing the aforementioned rear support structure in the vehicle cabin, can suppress the rear panel from breaking off and intruding into the cabin, thereby improving the overall vehicle collision safety.

[0021] Furthermore, the horizontal platform structure formed on the rear panel not only serves as storage space but also increases the overall structural strength and rigidity of the rear panel, improving its collision response performance. The second protrusion formed on the upper part of the rear panel increases its structural strength, further enhancing its collision response capabilities. The rear panel is made of carbon fiber composite material, leveraging its high rigidity and light weight to ensure its rigidity and ability to transmit impact forces, while also contributing to the weight reduction of the rear panel and the vehicle body. Attached Figure Description

[0022] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0023] Figure 1 This is a schematic diagram of the rear support structure described in Embodiment 1 of this utility model from one perspective.

[0024] Figure 2 This is a schematic diagram of the rear support structure described in Embodiment 1 of this utility model from another perspective;

[0025] Figure 3 This is a schematic diagram of the front floor structure according to Embodiment 1 of this utility model;

[0026] Figure 4 for Figure 4 Sectional view along direction AA in the middle;

[0027] Figure 5 This is a schematic diagram of the front floor plate described in Embodiment 1 of the present invention from one perspective.

[0028] Figure 6 This is a schematic diagram of the front floor plate described in Embodiment 1 of this utility model from another perspective;

[0029] Figure 7 This is a schematic diagram of the front floor lower plate and reinforcing structure as described in Embodiment 1 of this utility model;

[0030] Figure 8 This is a schematic diagram of the structure of the front floor lower plate according to Embodiment 1 of this utility model;

[0031] Figure 9 This is a schematic diagram of the reinforcing structure described in Embodiment 1 of this utility model;

[0032] Figure 10 This is a schematic diagram of the structure of the rear panel described in Embodiment 2 of this utility model;

[0033] Figure 11 This is a schematic diagram of the rear panel and central passage of the present invention projected in the vertical direction of the vehicle as described in Embodiment 2 of this utility model.

[0034] Explanation of reference numerals in the attached figures:

[0035] 1. Front floor; 2. Front bulkhead; 3. Rear bulkhead; 4. Reinforcing structure; 6. Sill beam;

[0036] 100. Central channel; 101. Front floor upper plate; 1011. Central channel upper plate; 1013. Recessed portion; 102. Front floor lower plate; 1021. Central channel lower plate; 106. First protrusion; 1061. Sloping surface; 108. Cavity;

[0037] 302. Platform structure; 303. Second protrusion;

[0038] 401. Reinforcing block; 402. Reinforcing arm; 4021. Extension section. Detailed Implementation

[0039] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0040] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" appear, indicating orientation or positional relationship, they are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, if terms such as "first" or "second" appear, they are also used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0041] Furthermore, in the description of this utility model, unless otherwise explicitly defined, the terms "installation," "connection," "joining," and "connector" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model in light of the specific circumstances.

[0042] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0043] Example 1

[0044] This embodiment relates to a rear support structure to solve the problem in the prior art where the rear section is prone to breakage and intrusion into the passenger compartment during a vehicle collision, thus affecting the overall vehicle collision safety.

[0045] In terms of overall structure, the rear support structure includes an upwardly bulging central channel 100 located in the vehicle cabin. The central channel 100 extends along the longitudinal direction of the vehicle, and its rear end connects to the rear bulkhead 3 in the vehicle cabin. A first protruding portion 106 is provided at the top of the rear end of the central channel 100. In the longitudinal direction of the vehicle, the protrusion height of the first protruding portion 106 gradually increases in the direction pointing towards the rear bulkhead 3.

[0046] The rear support structure described in this embodiment is connected to the rear panel 3 through the rear end of the central channel 100, and a first protrusion 106 with gradually increasing height is provided at the top of the rear end of the central channel 100. The central channel 100, especially the first protrusion 106 at its top, can provide good support for the rear panel 3. In the event of a rear-end collision, the rear panel 3 can be prevented from breaking and intruding into the passenger compartment, which helps to improve the safety of the vehicle collision.

[0047] Based on the above overview, an exemplary structure of the rear support structure in this embodiment is as follows: Figure 1 and Figure 2 As shown in the diagram, the front end of the front floor 1 is connected to the bottom of the front bulkhead 2, and the rear end is connected to the rear bulkhead 3. The left and right sides of the front floor 1 are connected to the door sill beams 6 respectively. The central passage 100 is located in the middle of the width direction of the front floor 1 and extends along the front-rear direction of the vehicle, so that the front end of the central passage 100 is connected to the front bulkhead 2 and the rear end is connected to the rear bulkhead 3. This helps to improve the connection and force transmission effect between the front floor 1 and the front bulkhead 2 and the rear bulkhead 3.

[0048] As a preferred implementation method, such as Figure 1 , Figure 5 and Figure 6As shown, the top of the first protrusion 106 is an inclined surface 1061 that slopes upwards and backwards towards the rear of the vehicle. This arrangement increases the projected area of ​​the rear end of the center channel 100 on the rear panel 3 along the longitudinal direction of the vehicle, giving the first protrusion 106 better support capabilities and helping to prevent the rear end of the center channel 100 from breaking.

[0049] Among them, along the direction pointing to the rear panel 3, that is Figure 6 In the direction of the central arrow, the protrusion height of the first protrusion 106 gradually increases, that is, the distance between the inclined surface 1061 and the front floor 1 in the vertical direction of the vehicle gradually increases along the direction pointing towards the rear panel 3. For example... Figure 6 As shown, the inclined plane 1061 forms an angle α with the horizontal plane, which is also the inclination angle of the inclined plane 1061.

[0050] In a preferred embodiment, the included angle α can be between 20° and 60°. This range of included angle α helps ensure the supporting performance of the first protrusion 106. For example, the included angle α can be 20°, 30°, 40°, 50°, 55°, or 60°. In practice, the included angle α should be as large as possible while still meeting the arrangement requirements to further ensure the supporting effect of the first protrusion 106.

[0051] In addition, combined Figure 3 and Figure 5 As shown, along the direction pointing towards the rear panel 3, the width of the first protrusion 106 gradually decreases in the left-right direction of the vehicle. The width of the inclined surface 1061 also gradually decreases in the left-right direction of the vehicle. This makes the cross-section of the rear end of the center tunnel 100 wider at the bottom and narrower at the top, which helps to increase the support capacity of the rear end of the center tunnel 100 and improves the response to rear-end collisions.

[0052] It should be noted that, in this embodiment, the top of the first protrusion 106 is, in addition to being, Figure 6 In addition to the inclined surface 1061 shown, it can also be an arc surface. In this case, it is necessary to ensure that the arc surface is also inclined upwards and backwards of the vehicle to ensure the support effect of the first protrusion 106.

[0053] To further enhance the force transmission performance of the central channel 100, in this embodiment, a reinforcing structure 4 is provided at the top of the central channel 100, and the reinforcing structure 4 extends from the front end of the central channel 100 to the rear end of the central channel 100. The reinforcing structure 4 at the top of the central channel 100 increases the overall rigidity of the central channel 100, thereby improving its support capacity for the rear panel 3 and its ability to transmit collision forces.

[0054] As a possible implementation method, such as Figure 9As shown, the reinforcing structure 4 includes a reinforcing block 401 located at the rear end of the central channel 100 and a reinforcing arm 402 located in front of the reinforcing block 401. The reinforcing arm 402 extends from the front end of the central channel 100 to the rear end and connects to the reinforcing block 401. The top of the reinforcing block 401 is fitted to the top of the first protrusion 106, and gradually rises in the direction pointing towards the rear panel 3. Here, the reinforcing structure 4 is composed of the reinforcing arm 402 and the reinforcing block 401, which makes the structure relatively simple, facilitating its design and molding. Simultaneously, having the rear end as the reinforcing block 401, with its top fitted to the top of the first protrusion 106, also ensures effective support for the rear panel 3.

[0055] In terms of specific structure, such as Figure 7 to Figure 9 As shown, the top of the reinforcing block 401 is adapted to the top of the first protrusion 106. That is, in the longitudinal direction of the vehicle, the protrusion height of the top of the reinforcing block 401 gradually increases in the direction pointing towards the rear panel 3, and the top surface of the reinforcing block 401 is also inclined, adapting to the inclined surface 1061. In addition, in the direction pointing towards the rear panel 3, the width of the top of the reinforcing block 401 gradually decreases in the lateral direction of the vehicle.

[0056] As a preferred embodiment, reference is still made to... Figure 7 and Figure 8 As shown, there are two reinforcing arms 402 arranged side by side in the left-right direction of the vehicle, and the two reinforcing arms 402 are respectively located at the left and right edges of the top of the central channel 100. The two reinforcing arms 402 arranged side by side can make the reinforcing structure 4 have a better reinforcing effect, and can further improve the rigidity and support capacity of the central channel 100.

[0057] Each reinforcing arm 402 has a downwardly extending extension portion 4021 on its outer side at the front end, and the extension portion 4021 is located on the side of the central channel 100. This facilitates further improvement in the fixing effect of the reinforcing structure 4 at the top of the central channel 100. To improve the structural utilization rate of the central channel 100, such as... Figure 5 As shown, the upper plate 1011 of the middle channel is provided with a recessed portion 1013 that is recessed downwards, and the recessed portion 1013 is located between the two reinforcing arms 402. This arrangement makes the shape of the cavity 108 fit the shape of the reinforcing structure 4.

[0058] Combination Figure 3 and Figure 4 As shown, the central channel 100 in this embodiment is made of carbon fiber composite material and includes a central channel upper plate 1011 and a central channel lower plate 1021 connected together. A cavity 108 is formed at the top of the central channel 100 between the central channel upper plate 1011 and the central channel lower plate 1021. The reinforcing structure 4 is formed by structural foam filling the cavity 108.

[0059] The central tunnel 100 is made of carbon fiber composite material. The high stiffness and light weight of carbon fiber composite material can be used to ensure the stiffness of the central tunnel 100 and also improve the lightweight level of the vehicle body. The cavity 108 between the upper plate 1011 and the lower plate 1021 of the central tunnel facilitates the arrangement of the reinforcing structure 4. At the same time, the reinforcing structure 4 uses structural foam, which has high strength and is also conducive to lightweight design.

[0060] In detail, the front floor 1 in this embodiment is preferably made of carbon fiber composite material. The high stiffness and light weight of carbon fiber composite material ensure vehicle body rigidity, improve the safety of the vehicle structure, and also contribute to the lightweighting of the vehicle body. The aforementioned upper central tunnel plate 1011 is formed on the upper front floor plate 101, and the lower central tunnel plate 1021 is formed on the lower front floor plate 102. Both the upper central tunnel plate 1011 and the lower central tunnel plate 1021 bulge upwards and extend along the longitudinal direction of the vehicle, thus forming the central tunnel 100. Structural foam is also filled between the upper front floor plate 101 and the lower front floor plate 102 located on the left and right sides of the central tunnel 100 to further improve the structural rigidity and collision safety of the front floor 1.

[0061] It should be noted that the structural foam in this embodiment can be a product from the prior art, such as PMI (polymethacrylimide) foam, which has excellent mechanical properties, chemical corrosion resistance, and good fire resistance. Of course, in addition to PMI foam, other structural foam materials with high structural stiffness can also be used.

[0062] In addition, the front bulkhead 2 and the sill beam 6 in this embodiment are preferably made of carbon fiber composite material to further reduce the weight of the vehicle cabin structure while meeting the structural strength requirements of the vehicle cabin.

[0063] In this embodiment, the rear support structure optimizes the rear end structure of the central channel 100 and provides an upwardly protruding first protrusion 106, which can provide good support for the rear panel 3. Furthermore, by setting a reinforcing structure 4 on the central channel 100, the force transmission performance of the central channel 100 is further improved, thereby enhancing the safety of the vehicle in a collision.

[0064] Example 2

[0065] This embodiment relates to a vehicle having a passenger compartment, and the passenger compartment having the rear support structure described in Embodiment 1.

[0066] like Figure 1 and Figure 11As shown, a horizontally arranged platform structure 302 is formed on the rear bulkhead 3. The lower part of the rear bulkhead 3 is connected to the front side of the platform structure 302, and the upper part of the rear bulkhead 3 is connected to the rear side of the platform structure 302. The rear end of the central tunnel 100 is connected to the lower part of the rear bulkhead 3, and the platform structure 302 is not lower than the central tunnel 100 in the vertical direction of the vehicle. The horizontal platform structure 302 formed on the rear bulkhead 3 not only serves as storage space but also increases the overall structural strength and rigidity of the rear bulkhead 3, thereby improving its collision response performance.

[0067] Furthermore, a second protrusion 303 bulging forward is formed on the upper part of the rear panel 3, located behind the center tunnel 100 when viewed vertically from the vehicle's perspective. The rear panel 3 is made of carbon fiber composite material. Here, the second protrusion 303 formed on the upper part of the rear panel 3 increases the structural strength of the upper part of the rear panel 3, which helps to further increase the collision resistance of the rear panel 3.

[0068] like Figure 10 As shown, the second protrusion 303 extends from the top of the rear bulkhead 3 down to the platform structure 302. The width of the top of the second protrusion 303 in the left-right direction of the vehicle gradually increases from bottom to top. The thickness of the bottom of the second protrusion 303 in the front-rear direction of the vehicle gradually decreases from bottom to top. This effectively enhances the strength of the upper part of the rear bulkhead 3 and provides good load-bearing capacity against collision forces.

[0069] As a preferred embodiment, the rear panel 3 is made of carbon fiber composite material. The high stiffness and light weight of carbon fiber composite material ensure the rigidity of the rear panel 3 and its ability to transmit impact forces, while also contributing to the weight reduction of the rear panel 3 and the vehicle body. In practice, the thickness of the rear panel 3 is generally around 5mm to achieve good rigidity; however, the thickness can be determined according to usage requirements. In this embodiment, the rear panel 3 is bonded to the front floor 1 and surrounding components such as the sill beam 6 during installation.

[0070] like Figure 11 As shown, the projections of the central channel 100 and the rear panel 3 in the vertical direction of the vehicle form a "T"-shaped force transmission channel. In the event of a vehicle collision, especially a rear-end collision, the collision force can be dispersed and transmitted through the "T"-shaped central channel 100 and rear panel 3, thereby improving the vehicle's collision safety.

[0071] The vehicle described in this embodiment, by providing the aforementioned rear support structure in the vehicle cabin, can suppress the rear panel 3 from breaking off and intruding into the cabin, thereby improving the overall vehicle collision safety. Furthermore, the platform structure 302 in the rear panel 3 allows for a hollowed-out lower section, which helps reduce the amount of carbon fiber composite material used, further reducing production costs.

[0072] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A rear wall support structure, characterized in that: a middle tunnel (100) upwardly bulging is arranged in a vehicle cabin; the middle tunnel (100) extends along a front-rear direction of the vehicle, and a rear end of the middle tunnel (100) is connected with a rear wall (3) in the vehicle cabin, and a first protruding part (106) upwardly protruding is arranged at a top of the rear end of the middle tunnel (100); and the protruding height of the first protruding part (106) gradually increases in a direction pointing to the rear wall (3) along the front-rear direction of the vehicle.

2. The rear wall support structure according to claim 1, characterized in that: a top of the first protruding part (106) is a slope (1061) obliquely arranged toward a rear upper side of the vehicle.

3. The rear wall support structure according to claim 1, characterized in that: a width of the first protruding part (106) in a left-right direction of the vehicle gradually decreases in the direction pointing to the rear wall (3).

4. The rear wall support structure according to any one of claims 1 to 3, characterized in that: a reinforcing structure (4) is arranged at the top of the middle tunnel (100), and the reinforcing structure (4) is penetrated by a front end of the middle tunnel (100) to a rear end of the middle tunnel (100).

5. The rear wall support structure according to claim 4, characterized in that: the reinforcing structure (4) comprises a reinforcing block (401) at the rear end of the middle tunnel (100), and a reinforcing arm (402) in front of the reinforcing block (401); the reinforcing arm (402) extends from the front end of the middle tunnel (100) to the rear end of the middle tunnel (100) and is connected to the reinforcing block (401), and a top of the reinforcing block (401) is adapted to the top of the first protruding part (106) and gradually increases in the direction pointing to the rear wall (3).

6. The rear wall support structure according to claim 5, characterized in that: the reinforcing arm (402) is two arms arranged side by side in the left-right direction of the vehicle, and the two reinforcing arms (402) are arranged at left and right edges of the top of the middle tunnel (100).

7. The rear wall support structure according to claim 4, characterized in that: the middle tunnel (100) is made of carbon fiber composite material and comprises a middle tunnel upper plate (1011) and a middle tunnel lower plate (1021) connected together; a cavity (108) is formed between the middle tunnel upper plate (1011) and the middle tunnel lower plate (1021) at the top of the middle tunnel (100), and the reinforcing structure (4) is formed by structural foam filled in the cavity (108).

8. A vehicle, characterized in that: a vehicle cabin is arranged in the vehicle, and the rear wall support structure according to any one of claims 1 to 7 is arranged in the vehicle cabin.

9. The vehicle according to claim 8, characterized in that: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ A horizontal platform structure (302) is formed on the rear panel (3), a lower part of the rear panel (3) is connected to a front side of the platform structure (302), and an upper part of the rear panel (3) is connected to a rear side of the platform structure (302); A rear end of the middle tunnel (100) is connected to the lower part of the rear panel (3), and in a vehicle up-down direction, the platform structure (302) is not lower than the middle tunnel (100).

10. The vehicle of claim 9, wherein: An upper part of the rear panel (3) is formed with a second protruding part (303) bulging towards a front of the vehicle, and the second protruding part (303) is located behind the middle tunnel (100) in the vehicle up-down direction; and / or The rear panel (3) is made of carbon fiber composite material.

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