Undercover and movable body

Abstract

To provide an undercover which can achieve reduction of the weight of a movable body while improving rigidity, and to provide the movable body.SOLUTION: An undercover is disposed on a lower surface of a movable body main part and has: a first plate-like member; and a wall part which is erected from the first plate-like member to the movable body main part side. The wall part has a plurality of partition walls which partition a space located adjacent to the movable body main part side of the first plate-like member into multiple spaces in a plan view of the first plate-like member.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to an undercover and a vehicle. [Background technology]

[0002] Conventionally, mobile objects such as vehicles are provided with an undercover that covers the underside of the vehicle body (the main body of the mobile object). The undercover makes it possible to protect the underside of the vehicle body. For example, Patent Document 1 discloses a configuration in which an undercover is provided to cover on-board components (e.g., a battery) provided on the underside of the vehicle body. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-187232 Summary of the Invention [Problem to be solved by the invention]

[0004] However, if the main body portion is thickened to increase the rigidity of the undercover, the weight of the undercover increases, which may make it difficult to reduce the weight of the vehicle.

[0005] An object of the present disclosure is to provide an undercover and a moving body that can reduce the weight of the moving body while increasing the rigidity. [Means for solving the problem]

[0006] The undercover according to the present disclosure is An undercover disposed on the underside of a vehicle body, a first plate-shaped member; a wall portion erected from the first plate-shaped member toward the movable body, The wall portion has a plurality of partition walls that divide a space adjacent to the movable body side of the first plate-shaped member into a plurality of spaces in a plan view of the first plate-shaped member.

[0007] A moving body according to the present disclosure includes: The above undercover and The moving body has a moving body. [Effects of the Invention]

[0008] According to the present disclosure, it is possible to reduce the weight of the moving body while increasing the rigidity of the undercover. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a diagram illustrating an example of a vehicle equipped with an undercover according to an embodiment of the present disclosure. [Figure 2] FIG. 2 is an enlarged cross-sectional view of an undercover portion of the vehicle. [Figure 3] FIG. 3 is an enlarged cross-sectional view of a first cover portion of the vehicle. [Figure 4] FIG. 4 is an enlarged cross-sectional view of a first cover portion. [Figure 5] FIG. 10 is a cross-sectional view of the wall portion cut along the XY plane. [Figure 6] FIG. 4 is an enlarged cross-sectional view of a second cover portion of the vehicle. [Figure 7] 4A to 4C are cross-sectional views of the second cover part. [Figure 8] 10 is a cross-sectional view of the extending wall portion taken along a plane parallel to the extending portion. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, an embodiment of the present disclosure will be described in detail with reference to the drawings. FIG. 1 is a diagram showing an example of a vehicle 1 equipped with an undercover 10 according to an embodiment of the present disclosure. In the following description, a Cartesian coordinate system (X, Y, Z) is used. The same Cartesian coordinate system (X, Y, Z) is used in the drawings described below. For example, the X direction indicates the left-right direction of the vehicle 1, the Y direction indicates the front-rear direction (direction of travel) of the vehicle 1, the Z direction indicates the up-down direction (height direction) of the vehicle 1, and the XY plane is a horizontal plane.

[0011] As shown in FIG. 1, vehicle 1 is, for example, an electric vehicle that can run on electricity. Vehicle 1 is not limited to automobiles and may be various types of moving objects. If vehicle 1 is an automobile, vehicle 1 may be a passenger car, bus, truck, work vehicle, etc. Vehicle 1 has a battery 2 and an undercover 10. Battery 2 is fixed to the underside (negative side in the Z direction) of vehicle body 1A in an area from a portion slightly negative side of the center in the Y direction to a portion corresponding to rear wheel 1B.

[0012] The undercover 10 is a cover member arranged on the underside (the surface on the negative side in the Z direction) of the vehicle body 1A. The undercover 10 is arranged to cover the area of ​​the vehicle body 1A from the part on the positive side in the Y direction of the rear wheel 1B to the end on the negative side in the Y direction of the vehicle body 1A.

[0013] As shown in Fig. 2, the undercover 10 is a resin molded product formed by, for example, injection molding, and has a first cover portion 11 and a second cover portion 12. Note that in Fig. 2 and other drawings, a simplified structure is shown in consideration of ease of viewing.

[0014] The first cover part 11 is a part that is arranged in an area from a part of the vehicle body 1A on the positive side of the rear wheel 1B in the Y direction to near the end of the rear wheel 1B on the negative side in the Y direction. The first cover part 11 is arranged in a position that covers an area including the end (rear end) on the negative side in the Y direction of the battery 2. As shown in FIG. 3 , the first cover part 11 is wider in the X direction than the battery 2 and is arranged so as to partially cover the battery 2 in the vehicle body 1A. The length in the Y direction of the part of the first cover part 11 that covers the battery 2 may be, for example, in the range of 1 / 3 to 1 / 2 of the length of the battery 2 in the Y direction. The fact that the first cover part 11 (partially) covers the battery 2 in the vehicle body 1A means that the first cover part 11 is arranged below the battery 2, i.e., the first cover part 11 is arranged between the battery 2 and the ground, and that the projection planes of the first cover part 11 and the battery 2, which are vertically projected onto the ground, partially overlap each other.

[0015] As shown in FIG. 4, the first cover part 11 has a surface part 111 (first plate-like member), a wall part 112 (first wall part), and a fixed part 113 (second plate-like member).

[0016] The surface portion 111 is a portion that constitutes the surface (negative surface in the Z direction) of the first cover portion 11, and is configured in a flat plate shape. When the surface portion 111 is placed on the underside of the vehicle body 1A, the underside of the surface portion 111 is arranged approximately parallel to the horizontal plane. The surface portion 111 is also impregnated with a fiber mat. That is, the surface portion 111 is composed of two layers (first layers) 111A made of a resin composition, and a layer (second layer) 111B in which the fiber mat is impregnated with the resin composition and contains the fiber mat and the resin composition. The second layer 111B is sandwiched between the two first layers 111A in the Z direction.

[0017] The wall portion 112 stands on the positive side (toward the vehicle body 1A) in the Z direction from the surface portion 111. The wall portion 112 has a plurality of partition walls that divide a space adjacent to the vehicle body 1A side of the surface portion 111 into a plurality of spaces (internal spaces) 112A in a plan view of the surface portion 111. More specifically, the plurality of partition walls of the surface portion 111 divide the space into a plurality of spaces 112A in a plan view of the surface portion 111. The wall portion 112 is configured in a honeycomb shape by the plurality of partition walls (see FIG. 5 ) and is arranged over the entire area of ​​the surface portion 111. The wall portion 112 may be molded (configured) integrally with the surface portion 111, or may be molded separately from the surface portion 111. By forming the wall portion 112 as a member molded integrally with the surface portion 111, the manufacturing cost of the wall portion 112 can be reduced and the rigidity of the surface portion 111 can be more easily improved.

[0018] The fixed portion 113 is a portion fixed to the vehicle body 1A, and is arranged on the positive side in the Z direction (toward the vehicle body 1A) of the wall portion 112 so as to sandwich the wall portion 112 between the surface portion 111. The fixed portion 113 has a structure similar to that of the surface portion 111, and is composed of two first layers 113A made of a resin composition, and a second layer 113B containing a fiber mat and the resin composition, which is formed by impregnating a fiber mat with the resin composition. In other words, the second layer 113B is sandwiched between the two first layers 113A in the Z direction.

[0019] The fixed portion 113 is formed separately from the surface portion 111 and the wall portion 112, and is joined to the wall portion 112 by welding or an adhesive on the + side in the Z direction of the wall portion 112. In addition, the surface of the fixed portion 113 on the + side in the Z direction is fixed to any location on the vehicle body 1A by a fixing member such as a bolt, welding, an adhesive, or the like.

[0020] The surface portion 111 and the fixed portion 113 can be formed by insert molding, in which a resin composition is injected into a mold with a fiber mat placed inside the mold.

[0021] The resin composition forming the surface portion 111 and the fixed portion 113 is not particularly limited, but for example, a resin composition containing a thermoplastic resin can be used. Examples of such thermoplastic resins include polyester resins such as polycarbonate, polyethylene terephthalate, polytrimethylene terephthalate, and polybutylene terephthalate; styrene-based resins such as polystyrene resin, high-impact polystyrene resin (HIPS), acrylonitrile-styrene copolymer (AS resin), acrylonitrile-butadiene-styrene copolymer (ABS resin), acrylonitrile-styrene-acrylic rubber copolymer (ASA resin), and acrylonitrile-ethylene propylene rubber-styrene copolymer (AES resin); polyolefin resins such as polyethylene and polypropylene; polyamide, polyimide, polyetherimide, polyurethane, polyphenylene ether, polyphenylene sulfide, polysulfone, and polymethacrylate. Among these, polyolefin-based resins are preferred because of their low specific gravity, which allows the weight of the moving body to be reduced when used in large-area components, and their good processability. Polypropylene is more preferred.

[0022] The resin composition forming the surface portion 111 and the fixed portion 113 may contain, in addition to the above-mentioned thermoplastic resin, various additives such as fibers such as glass fiber, carbon fiber, metal fiber, natural fiber, ceramic fiber, synthetic fiber, and elastomers such as olefin-based elastomers; inorganic fillers such as talc, calcium carbonate, metal powder, carbon black, graphite, titanium oxide, and zinc oxide; colorants such as pigments and dyes; antioxidants, ultraviolet absorbers, light stabilizers, heat stabilizers, antistatic agents, nucleating agents, dispersants, flame retardants, flame retardant assistants, and plasticizers.

[0023] A fiber mat is a cloth-like member formed by intertwining fine fiber materials. The fiber mat may be, for example, a mat in which the fiber materials are regularly woven, or a mat in which the fiber materials are randomly woven. The fiber mat may be a glass fiber mat. The glass fiber mat is formed by weaving glass fibers that have been processed (e.g., bulky processed) to impart bulkiness and elasticity into a mat shape. Glass fiber mats include chopped strand mats, surface mats, cross mats, roving cloths, etc.

[0024] As described above, the second layer 111B of the surface portion 111 and the second layer 113B of the fixed portion 113 have a structure in which the resin composition constituting the first layer (111A, 113A) is impregnated into the fiber mat. That is, the second layer 111B and the second layer 113B have a structure in which the resin composition penetrates or fills the gaps between the multiple fiber materials constituting the fiber mat. In other words, the second layer 111B and the second layer 113B have a fiber mat in addition to the resin composition within the layer. Because the fiber mat has higher impact resistance than a layer made of a resin composition, the second layer 111B and the second layer 113B have higher impact resistance than the corresponding first layer (111A, 113A).

[0025] 2, the second cover portion 12 is a portion that is arranged in an area from near the end of the vehicle body 1A on the negative side in the Y direction of the rear wheel 1B to the end (rear end) on the negative side in the Y direction of the vehicle body 1A. In other words, the second cover portion 12 is arranged at a position on the negative side in the Y direction of the first cover portion 11 of the vehicle body 1A. The second cover portion 12 has an extending portion 121 (second portion) and an extending wall portion 122 (second wall portion) (see FIG. 7).

[0026] The extension portion 121 is a member integrally molded with the surface portion 111 (first portion) of the first cover portion 11, and is configured as one unit. The extension portion 121 extends from the end portion on the negative side in the Y direction of the surface portion 111 so as to be positioned on the positive side in the Z direction as it moves toward the negative side in the Y direction. In other words, the extension portion 121 is provided so as to incline upward and rearward relative to the fore-and-aft direction of the vehicle body 1A. When the extension portion 121 is arranged on the underside of the vehicle body 1A, it is arranged at a position rearward of the surface portion 111 of the vehicle body 1A, and is arranged so that the underside of the extension portion 121 intersects with a horizontal plane.

[0027] Furthermore, the extension 121 has a dimple portion formed of a plurality of recesses 121A on the surface opposite to the side facing the vehicle body 1A. The recesses 121A are arranged in a line in the X and Y directions on the surface of the extension 121 (see also FIG. 6).

[0028] As shown in FIG. 7, the extending wall portion 122 stands on the vehicle body 1A side from the extending portion 121. Like the wall portion 112 of the first cover portion 11, the extending wall portion 122 has a plurality of partition walls that divide the space adjacent to the vehicle body 1A side of the surface portion 111 into a plurality of spaces (internal spaces) 122A in a plan view of the surface portion 111. More specifically, the plurality of partition walls of the extending wall portion 122 divide the space into a plurality of spaces 122A in a plan view of the extending portion 121. In other words, the extending wall portion 122 is configured in a honeycomb shape by the plurality of partition walls (see FIG. 8). The extending wall portion 122 may be molded integrally with the extending portion 121 or may be molded separately from the extending portion 121.

[0029] The surface of the extending wall portion 122 on the positive side in the Z direction is fixed to the end portion of the vehicle body 1A on the negative side in the Y direction by welding, adhesive, mechanical fastening, or the like.

[0030] The effects of the undercover 10 of this embodiment configured as above will be described below.

[0031] By providing the undercover 10 on the underside (negative surface in the Z direction) of the vehicle body 1A, it becomes possible to protect the vehicle body 1A from objects placed on the ground or raised ground. However, if the undercover 10 is made thicker in order to increase the protective power (rigidity) of the undercover 10, the weight of the undercover 10 will increase, which may make it impossible to reduce the weight of the vehicle 1.

[0032] In contrast, the undercover 10 according to the present embodiment has a plurality of partition walls that divide a plurality of internal spaces, and thus includes wall portions 112 and extending wall portions 122 that are configured in a honeycomb shape. As a result, even if an object collides with the undercover 10, the internal spaces allow the wall portions 112 or extending wall portions 122 to deform, thereby absorbing the impact of the object colliding. In other words, the internal spaces can function as collision energy absorption sections.

[0033] As a result, it is possible to increase the rigidity of the entire undercover 10. Furthermore, because there is an internal space, it is possible to reduce the weight of the undercover 10 compared to a configuration having a wall portion with no internal space. That is, in this embodiment, it is possible to reduce the weight of the vehicle while increasing the rigidity.

[0034] Furthermore, since the fixed portion 113 is disposed on the side of the wall portion 112 opposite to the surface portion 111, the rigidity of the first cover portion 11 portion of the undercover 10 can be further increased.

[0035] Furthermore, since the first cover part 11 partially covers the battery 2 of the vehicle body 1A, the battery 2 can be protected by the highly rigid first cover part 11. Furthermore, since the battery 2 is protected by the highly rigid first cover part 11, which is made up of the surface part 111, the wall part 112, and the fixed part 113, the protection for the battery 2 can be further strengthened.

[0036] Furthermore, the surface portion 111 and the fixed portion 113 of the first cover portion 11 each have a first layer 111A made of resin and a second layer 111B including a fiber mat. As a result, when an object collides with the undercover 10, the fiber mat collapses, making it possible to absorb the impact of the object's collision.

[0037] As a result, the impact absorption capacity can be increased compared to when the surface portion and the fixed portion are made of resin only, so that the undercover 10 can be made even thinner, which in turn can further reduce the weight of the vehicle 1.

[0038] Furthermore, the extension portion 121 of the second cover portion 12 extends from the end portion on the negative side in the Y direction of the first cover portion 11 so as to be positioned on the positive side in the Z direction as it moves toward the negative side in the Y direction. In other words, the distance between the portion of the second cover portion 12 in the undercover 10 and the ground increases as it moves toward the negative side in the Y direction, so the airflow along the vehicle body 1A becomes faster, the pressure decreases, and ultimately negative pressure is generated. As a result, a force is generated that presses the vehicle 1 toward the negative side in the Z direction, increasing the grip force of the vehicle 1 and ultimately improving handling stability.

[0039] That is, in this embodiment, it is possible to increase the rigidity and reduce the weight of the vehicle 1, while also improving the driving stability.

[0040] Furthermore, the surface shape of the extension 121 is a dimple shape made up of a plurality of recesses 121A. As a result, when the airflow along the vehicle body 1A hits the recesses 121A, turbulence is generated and the position of the air separation moves downstream. As a result, air separation while the vehicle 1 is traveling is suppressed, and the generation of large air vortices can be suppressed, thereby reducing air resistance.

[0041] Furthermore, by combining the first cover part 11 and the second cover part 12, it is possible to suppress flapping of the undercover 10 due to negative pressure based on the extension part 121, and thus it is possible to suppress the occurrence of cavity resonance.

[0042] Furthermore, because the extension 121 of the second cover part 12 is integrally formed with the surface part 111 of the first cover part 11, the part that protects the vehicle body 1A or the on-board parts (battery 2) and the part that reduces air resistance can be integrated into one part. As a result, the number of parts can be reduced, and ultimately the overall cost can be kept down.

[0043] Incidentally, when the driver of the vehicle 1 is traveling backward, it is more difficult for the driver to notice an obstacle such as a curb than when the vehicle 1 is traveling forward. Therefore, when the vehicle 1 runs over an obstacle, it is necessary to reliably protect the rear portions (the portions on the negative side in the Y direction) of the on-board components such as the battery 2.

[0044] In this embodiment, the surface portion 111 of the first cover portion 11 is arranged in an area on the negative side in the Y direction from the center portion in the Y direction of the battery 2. As a result, the surface portion 111 can reliably prevent collisions between obstacles and on-board components when the vehicle 1 is traveling backward.

[0045] In the above embodiment, the first cover portion is disposed in a position that partially covers the battery provided on the vehicle body, but the present disclosure is not limited to this. For example, the first cover portion may be disposed in a position that completely covers the battery.

[0046] In the above embodiment, the wall portion and the extending wall portion are configured in a honeycomb shape by a plurality of partition walls, but the present disclosure is not limited to this. For example, the wall portion and the extending wall portion may be configured such that a plurality of partition walls partition triangular spaces, rectangular spaces, circular spaces, etc.

[0047] In the above embodiment, the first cover portion has a fixed portion, but the present disclosure is not limited to this. The first cover portion may be composed of only a surface portion and a wall portion without a fixed portion. In this case, the wall portion may be fixed to the vehicle body. However, from the viewpoint of improving the rigidity of the first cover portion, it is preferable that the first cover portion has a fixed portion.

[0048] In the above embodiment, the surface portion and the fixed portion have a first layer and a second layer, but the present disclosure is not limited to this, and at least one of the surface portion and the fixed portion may be composed of only the first layer of resin. However, from the viewpoint of shock absorption and thinning of the surface portion and the fixed portion, it is preferable that the surface portion and the fixed portion have a first layer and a second layer.

[0049] Furthermore, in the above embodiment, the surface portion and the fixed portion are impregnated with a fiber mat, but the present disclosure is not limited to this, and for example, a configuration in which a fiber sheet is attached to the surface portion may also be used.

[0050] Furthermore, although the fixed portion has the same configuration as the surface portion, the present disclosure is not limited to this, and the fixed portion may have a different configuration from the surface portion.

[0051] In the above embodiment, the height of the partition walls in the wall portion is uniform, but the present disclosure is not limited to this, and the height of the partition walls does not have to be uniform. For example, the height of the partition walls in the portion that needs to be strengthened, such as the portion that covers the battery, may be made higher than the height of the partition walls in other portions to increase rigidity.

[0052] Furthermore, in the above embodiment, the first cover portion covers the battery, but the present disclosure is not limited to this, and may cover an on-board component other than the battery, or may cover a part of the vehicle body regardless of whether or not there is an on-board component.

[0053] Furthermore, in the above embodiment, the second cover portion is provided, but the present disclosure is not limited to this, and the second cover portion does not necessarily have to be provided.

[0054] Furthermore, in the above embodiment, the second cover portion has the extending wall portion, but the present disclosure is not limited to this, and the second cover portion does not have to have the extending wall portion.

[0055] In the above embodiment, the height of the partition wall of the extending wall portion is uniform, but the present disclosure is not limited to this, and the height of the partition wall does not have to be uniform. For example, the partition wall in the portion that is likely to hit an obstacle such as a curb (the portion of the second cover portion that is relatively closer to the negative side in the Z direction) may be configured to be higher than the partition walls in other portions to increase rigidity.

[0056] Furthermore, in the above embodiment, the surface shape of the extension portion is a dimple shape, but the present disclosure is not limited to this, and the shape does not have to be a dimple shape.

[0057] In addition, in the above embodiment, the second layer of the surface portion and the fixed portion includes a fiber mat, but the present disclosure is not limited to this and may be made of any material as long as it includes a material (e.g., rubber) that is more impact resistant than the first layer. However, from the perspective of further thinning the undercover, it is preferable that the second layer includes a fiber member.

[0058] Furthermore, in the above embodiment, the vehicle is an electric vehicle, but the present disclosure is not limited to this, and may be a vehicle other than an electric vehicle.

[0059] Furthermore, the above-described embodiments are merely examples of specific embodiments for carrying out the present disclosure, and the technical scope of the present disclosure should not be interpreted as being limited by these embodiments. In other words, the present disclosure can be carried out in various forms without departing from its gist or main features. [Industrial Applicability]

[0060] The undercover of the present disclosure is useful as an undercover that can reduce the weight of a vehicle while increasing rigidity. [Explanation of symbols]

[0061] 1A Body 10 Undercover 11 First cover part 111 surface portion (first plate-like member) 112 Wall 112A Interior Space

Claims

1. An undercover disposed on the underside of a vehicle body, a first plate-shaped member; a wall portion erected from the first plate-shaped member toward the movable body, the wall portion has a plurality of partition walls that divide a space adjacent to the first plate-shaped member on the movable body main body side into a plurality of spaces in a plan view of the first plate-shaped member, Undercover.

2. The wall portion is configured in a honeycomb shape by the plurality of partition walls. The undercover according to claim 1 .

3. The wall portion is a member integrally formed with at least a part of the first plate-shaped member. The undercover according to claim 1 .

4. the first plate-shaped member has at least a first layer made of resin and a second layer having higher impact resistance than the first layer; The undercover according to claim 1 .

5. the second layer at least partially comprising a fiber mat; The undercover according to claim 4.

6. a second plate-shaped member disposed so as to sandwich the wall portion between the first plate-shaped member and the second plate-shaped member; The undercover according to claim 1 .

7. the first plate-shaped member is disposed at a position at which it at least partially covers a battery provided in the main body of the movable body; The undercover according to claim 1 .

8. the first plate-shaped member is disposed at a position covering an area including a rear end portion of the battery; The undercover according to claim 7.

9. The first plate-shaped member includes: a first portion in which a lower surface of the first plate-like member is disposed substantially parallel to a horizontal plane when the first plate-like member is disposed on a lower surface of the movable body; a second portion that is disposed on the lower surface of the movable body body behind the first portion of the movable body body and is disposed so that the lower surface of the first plate-like member intersects with a horizontal plane when the second portion is disposed on the lower surface of the movable body body, a lower surface of the second portion is positioned upward from the rear end of the first portion toward the rear side of the movable body; The undercover according to claim 1 .

10. the second portion has a dimple portion formed of a plurality of recesses on a surface opposite to the side facing the movable body; The undercover according to claim 9.

11. The wall portion has a first wall portion erected from the first portion toward the movable body main body side, and a second wall portion erected from the second portion toward the movable body main body side. The undercover according to claim 10.

12. The second portion is integrally formed with the first portion. The undercover according to claim 9.

13. An undercover according to any one of claims 1 to 12; A moving body; Mobile object.

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