Vehicle and undercover for use under vehicle floor

Abstract

A vehicle includes a heat source located under a vehicle floor, a first undercover located under the vehicle floor and configured to cover the heat source from below, and a resin component located under the vehicle floor. The resin component is located between the heat source and the first undercover in a vehicle vertical direction and located on a vehicle outer side of the heat source in a vehicle width direction. The first undercover has a facing surface facing the heat source being made of a metal and at least a portion of the facing surface being covered with a low-reflection material. The low-reflection material has a lower reflectance of radiation than the metal.

Description

CROSS REFERENCE TO RELATED APPLICATIONS

[0001] This application claims priority under 35 U.S.C. § 119 to Japanese Patent Application No. 2025-009158 filed on Jan. 22, 2025, the entire disclosure of Japanese Patent Application No. 2025-009158 is hereby incorporated herein by reference.TECHNICAL FIELD

[0002] The present invention relates to a vehicle and an undercover for use under vehicle floor.BACKGROUND INFORMATION

[0003] In JP 2019-064315 A, as a vehicle body lower part structure in which an undercover is arranged under an exhaust pipe, a structure in which an opening is provided in the undercover to protect a resin component (a resin casing of an exhaust shutter valve) provided in the exhaust pipe from heat damage is disclosed.SUMMARY

[0004] There is a problem in that in a scene where a vehicle is stopping and traveling wind cannot thus be introduced, cooling effect cannot be achieved.

[0005] The present invention has been made in consideration of the above-described circumstances, and an object of the present invention is to provide a vehicle and an undercover for use under a vehicle floor capable of suppressing temperature increase of a resin component arranged under the vehicle floor.

[0006] According to one aspect of the present invention, there is provided a vehicle including: a heat source located under a vehicle floor; a first undercover located under the vehicle floor and configured to cover the heat source from below; and a resin component located under the vehicle floor, wherein the resin component is located between the heat source and the first undercover in a vehicle vertical direction and located on a vehicle outer side of the heat source in a vehicle width direction, and the first undercover has a facing surface facing the heat source is made of a metal and at least a portion of the facing surface is covered with a low-reflection material, the low-reflection material having a lower reflectance of radiation than the metal.

[0007] According to one aspect of the present invention, it is possible to suppress temperature increase of a resin component arranged under the vehicle floor.BRIEF DESCRIPTION OF DRAWINGS

[0008] Referring now to the attached drawings which form a part of this original disclosure, illustrative embodiments are shown.

[0009] FIG. 1 is a schematic diagram illustrative of a configuration example of an underfloor structure of a vehicle according to an embodiment of the present invention;

[0010] FIG. 2 is a diagram illustrative of an undercover and a surrounding area thereof within the underfloor structure illustrated in FIG. 1, in an enlarged manner;

[0011] FIG. 3 is a cross-sectional view of the undercover and the surrounding area thereof in FIG. 2 taken along the line A-A′ that is parallel to the vehicle width direction and that passes the undercover;

[0012] FIG. 4 is a cross-sectional view schematically illustrative of a configuration example 1 of the undercover according to the embodiment of the present invention;

[0013] FIG. 5 is a cross-sectional view schematically illustrative of a configuration example 2 of the undercover according to the embodiment of the present invention;

[0014] FIG. 6 is a cross-sectional view of the undercover and the surrounding area thereof in FIG. 2 taken along the line B-B′ that is parallel to the vehicle longitudinal direction and that passes the undercover;

[0015] FIG. 7 is a diagram illustrative of an undercover 3 and a surrounding area thereof within the underfloor structure illustrated in FIG. 6, in an enlarged manner;

[0016] FIG. 8 is a diagram exemplarily illustrative of a state in which the undercover is removed from an area under a floor of a vehicle body illustrated in FIG. 2;

[0017] FIG. 9 is a diagram illustrative of a connection point between a catalyst and a harness and a vicinity thereof illustrated in FIG. 8, in an enlarged manner; and

[0018] FIG. 10 is a graph illustrative of an experimental result conducted by the inventor.DETAILED DESCRIPTION OF EMBODIMENTS

[0019] An embodiment of the present invention will be described below with reference to the drawings. In description of the drawings referred to in the following description, identical or similar reference signs are assigned to identical or similar parts. However, it should be noted that the drawings are schematic and a ratio of thicknesses or lengths of respective portions and the like are different from actual onesConfiguration Example

[0020] FIG. 1 is a schematic diagram illustrative of a configuration example of an underfloor structure of a vehicle 1 according to the embodiment of the present invention. FIG. 2 is a diagram illustrative of an undercover 3 and a surrounding area thereof within the underfloor structure illustrated in FIG. 1, in an enlarged manner. FIG. 3 is a cross-sectional view of the undercover 3 and the surrounding area thereof in FIG. 2 taken along the line A-A′ that is parallel to the vehicle width direction and that passes the undercover 3.

[0021] As illustrated in FIGS. 1 to 3, the vehicle 1 according to the embodiment includes an exhaust pipe 2 that is located under a vehicle floor, an undercover 3 (an example of a “(first) undercover” of the present invention) that is attached under the vehicle floor and that covers a front side (that is, the front side in the vehicle longitudinal direction) of a center tunnel 23 from below, a floor undercover 4 (an example of a “second undercover” of the present invention) made of resin that is attached under the vehicle floor and that covers a floor panel 8 (an example of a “vehicle floor surface” of the present invention) made of metal that forms a floor surface of a vehicle body, from below, and a front undercover 5 that covers an engine room from below.

[0022] The center tunnel 23 is provided on the floor panel 8. The center tunnel 23 extends in the vehicle longitudinal direction at a central portion in the vehicle width direction, and has a shape with the bottom open. On the inside of the center tunnel 23, a heat shielding layer 24 is provided along the shape of the center tunnel 23.

[0023] In the center tunnel 23 in which the heat shielding layer 24 is provided, the exhaust pipe 2 and a catalyst 21 (an example of a “heat source” in the present invention) connected to the exhaust pipe 2 are installed. The catalyst 21 is, for example, a three-way catalyst, or a gasoline particulate filter (GPF). The catalyst 21 has a larger diameter and a relatively higher thermal capacity than the exhaust pipe 2.

[0024] The undercover 3 is attached under the floor of the vehicle body in such a manner as to cover at least a portion (for example, a part on the front side in the vehicle longitudinal direction) of the catalyst 21 provided inside the center tunnel 23. The undercover 3 is not provided with a through-hole to cause traveling wind to flow into the center tunnel 23 when the vehicle is traveling.

[0025] A front edge portion 3FE of the undercover 3 is fastened to a suspension member 51 by a fastening member 39 such as a bolt and a nut. Right and left side edge portions 3SE of the undercover 3 are fastened to tunnel frames (not illustrated) provided on both right and left sides of the center tunnel 23, by fastening members 39. In addition, the undercover 3 is connected to each of the floor undercover 4 and the front undercover 5 by fastening members 39.

[0026] The undercover 3 protects components, such as the catalyst 21, the exhaust pipe 2 connected to the catalyst 21, and an exhaust gas temperature sensor 7 from being damaged by a jumping stone. For example, as illustrated by dashed lines in FIG. 1, when the vehicle 1 moves forward with a steering wheel turned to the right, the undercover 3 is caused to be located in the rear of a front tire 6R. In this case, the undercover 3 has a role of protecting components, such as the catalyst 21, the exhaust pipe 2, and the exhaust gas temperature sensor 7, lest a jumping stone JS from the right front tire 6R come into contact with the components. Likewise, when the vehicle 1 moves forward with the steering wheel turned to the left, the undercover 3 has a role of protecting components, such as the catalyst 21 and the exhaust gas temperature sensor 7, lest a jumping stone JS from the left front tire 6L come into contact with the components.

[0027] The undercover 3 has a facing surface 3a that faces the catalyst 21 while the undercover 3 is attached under the vehicle floor. The facing surface 3a is made of a metal, such as aluminum or stainless steel. At least a portion of the facing surface 3a is covered with a low-reflection material that has a lower reflectance of radiation than the metal of which the facing surface 3a is made. Because of this configuration, the undercover 3 is capable of preventing radiation (radiated heat) from the catalyst 21, which serves as a heat source, from being reflected by the facing surface 3a.

[0028] For example, as illustrated in FIG. 3, the floor undercover 4 made of resin exists as a resin component around the undercover 3. An edge portion 41 of the floor undercover 4 that is a portion of the floor undercover 4 and is located on the center tunnel 23 side exists at a position facing the catalyst 21, which serves as a heat source. In addition, the edge portion 41 exists in a direction in which radiation is reflected by the undercover 3. Therefore, both a radiation H1 from the catalyst 21 and a radiation H11 reflected by the undercover 3 are incident on the edge portion 41.

[0029] However, in the present embodiment, at least a portion of the facing surface 3a of the undercover 3 is covered with a low-reflection material that has a lower reflectance of radiation than the metal of which the facing surface 3a is made. Therefore, the radiation H11 due to reflection can be suppressed, and heat transferred due to incidence of the radiation H11 (hereinafter, also referred to as reflected heat) can be reduced.

[0030] For example, when the entire facing surface 3a is covered with a low-reflection material and the low-reflection material is colored black and has a reflectance of zero (0) or close to zero, the radiation H11 from the facing surface 3a can be brought to zero or close to zero. Because of this configuration, temperature increase of the edge portion 41 can be suppressed and the edge portion 41 can be prevented from having a high temperature.

[0031] FIGS. 4 and 5 are cross-sectional views schematically illustrative of configuration examples 1 and 2 of the undercover 3 according to the embodiment of the present invention. As illustrated in FIG. 4, the entire undercover 3 including the facing surface 3a, which faces the catalyst serving as a heat source, is made of metal. A low-reflection material 31 with a lower reflectance than the metal is provided on the entire area of the facing surface 3a (for example, the upper surface) of the undercover 3 made of metal. The low-reflection material 31 is, for example, a heat-resistant paint layer or a colored layer formed by cation coating. From a perspective of suppressing reflectance of the radiation H1 (that is, suppressing the radiation H11), the colored layer is preferably a non-transparent layer, more preferably a deeply colored layer, and further more preferably a black layer.

[0032] The undercover 3 may be made of metal only in part, including the facing surface 3a, rather than in whole. For example, as illustrated in FIG. 5, the undercover 3 may include a substrate 32 made of resin and a substrate 33 made of metal mounted on the substrate 32 made of resin. A front surface of the substrate 33, which is made of metal, is the facing surface 3a, and the low-reflection material 31 is provided on the entire area of the facing surface 3a. Even with this configuration, it is possible to suppress the reflectance of the radiation H1 as with the configuration illustrated in FIG. 4.

[0033] FIG. 6 is a cross-sectional view of the undercover 3 and the surrounding area thereof in FIG. 2 taken along the line B-B′ that is parallel to the vehicle longitudinal direction and that passes the undercover 3. As illustrated in FIG. 6, in the present embodiment, the catalyst 21, which serves as a heat source, the undercover 3, which serves as a reflection source of radiation, and the floor undercover 4, which is a resin component, overlap one another in the vehicle longitudinal direction. The layout is a layout that minimizes distances from the heat source and the reflection source to the resin component and that causes the resin component to easily have a high temperature. However, even with such a layout, since the facing surface 3a of the undercover 3 is covered with the low-reflection material 31 as illustrated in FIG. 4 or 5 (for example, the undercover 3 is colored black or the like by cation coating, or it is a heat-resistant paint layer), the radiation H11 can be suppressed. Because of this configuration, it is possible to reduce reflected heat transferred to the resin component, and suppress temperature increase of the resin component due to the reflected heat.

[0034] FIG. 7 is a diagram illustrative of the undercover 3 and the surrounding area thereof within the underfloor structure illustrated in FIG. 6, in an enlarged manner. As illustrated in FIG. 7, the undercover 3 may be arranged only on the front side of the center in the vehicle longitudinal direction of the catalyst 21, which serves as a heat source. In FIG. 7, a reference sign 3RE indicates a rear edge of the undercover 3 in the vehicle longitudinal direction, and a reference sign 4FE indicates a front edge of the floor undercover 4 in the vehicle longitudinal direction. A cross-sectional shape of the undercover 3 when viewed from a side of the vehicle may include unevenness (bead).

[0035] As illustrated in FIG. 7, even in a case where distance from the catalyst 21, which serves as a heat source, to the undercover 3, which serves as a reflection source, is far apart at first view, when a bead exists at a position facing the heat source (that is, a position on which the radiation H1 is incident), a recessed portion 35 of the bead has a possibility to aggregate reflected heat like a concave mirror. However, even in such a form, since the facing surface 3a, including the recessed section 35 of the bead, of the undercover 3 is covered with the low-reflection material 31 as illustrated in FIGS. 4 and 5, aggregation of reflected heat can be suppressed.

[0036] FIG. 8 is a diagram exemplarily illustrative of a state in which the undercover 3 is removed from an area under the floor of the vehicle body illustrated in FIG. 2. FIG. 9 is a diagram illustrative of a connection point between the catalyst 21 and a harness 71 and a vicinity thereof illustrated in FIG. 8, in an enlarged manner. As illustrated in FIG. 8, in an area facing the undercover 3 under the vehicle floor, for example, the harness 71 and a connector 72 of the exhaust gas temperature sensor 7 are arranged. In the present embodiment, as well as the floor undercover 4 (or in place of the floor undercover 4), the harness 71 including a coating made of resin and the connector 72 including an exterior (housing) made of resin may be the “resin components” of the present invention. Even in such a form, since the facing surface 3a of the undercover 3 is covered with the low-reflection material 31, it is possible to suppress the radiation H11 to the harness 71, the connector 72, and the like and thereby suppress temperature increase of such components.

[0037] In addition, as illustrated in FIG. 9, the harness 71 includes a conduit 711 made of metal and a wiring 712 covered with a coating made of resin, and a portion of the wiring 712 may be inserted through the conduit 711. In this case, not only the portion of the wiring 712 located outside the conduit 711 but also a portion of the wiring 712 located inside the conduit 711 may be included in the “resin components” of the present invention. By suppressing the radiation H11 to the conduit 711, it is possible to suppress temperature increase of the portion of the wiring 712 located inside the conduit 711.Experimental Result

[0038] The inventor conducted, with respect to an underfloor structure of a vehicle, an experiment to examine change in temperature of a floor undercover made of resin (hereinafter, also referred to as a resin cover) by using a form in which the entire area of a facing surface of a tunnel undercover made of aluminum is colored black as an example and a form in which a facing surface of a tunnel undercover made of aluminum is not colored at all as a comparative example. Only difference between the example and the comparative example is presence or absence of coloring of the facing surfaces. In this experiment, the engine of a vehicle was run while the vehicle was stopping, and while maintaining this state, temperature of each resin cover existing in the vicinity of the tunnel undercover was measured.

[0039] FIG. 10 is a graph illustrative of an experimental result conducted by the inventor. In FIG. 10, the abscissa represents elapsed time (seconds) since the running of the engine is started, and the ordinate represents temperature of the resin covers. In FIG. 10, a solid line (1) is a measurement result in the example, and a dashed line (2) is a measurement result in the comparative example. As illustrated in FIG. 10, it was confirmed that temperature increase of the resin cover is suppressed in the example compared with the comparative example.Advantageous Effects of Embodiment(1) As described in the foregoing, a vehicle 1 according to the embodiment of the present invention includes: a catalyst 21 located under a vehicle floor and configured to serve as a heat source; an undercover 3 located under the vehicle floor and configured to cover the catalyst 21 from below; and a resin component (for example, a floor undercover 4) located under the vehicle floor. The resin component is located between the catalyst 21 and the undercover 3 in a vehicle vertical direction and located on a vehicle outer side of the catalyst 21 in a vehicle width direction. The undercover 3 has a facing surface 3a facing the catalyst 21 is made of a metal and at least a portion of the facing surface 3a is covered with a low-reflection material 31, the low-reflection material 31 having a lower reflectance of radiation than the metal. For example, the low-reflection material 31 is a heat-resistant paint layer or a colored layer (more specifically, a black layer, a deeply colored layer, or a non-transparent layer) formed by cation coating.

[0041] The resin component receives radiation not only directly from the catalyst 21 but also indirectly from the undercover 3. However, since the facing surface 3a of the undercover 3 is colored, for example, black or the like, a radiation H11 from the facing surface 3a can be suppressed, and reflected heat can be reduced. Because of this configuration, it is possible to suppress temperature increase of the resin component due to reflected heat not only while the vehicle is traveling but also while the vehicle is stopping when traveling wind cannot be introduced, and thereby prevent the resin component from having a high temperature.

[0042] (2) It is preferable that the undercover 3 be not provided with a through-hole to cause traveling wind to flow in. Even when no through-hole is provided, the facing surface 3a of the undercover 3 is colored black or the like and heat reflection by the facing surface 3a is thereby suppressed, and reflected heat can be reduced. Because of this configuration, it is possible to suppress temperature increase of the resin component due to reflected heat both while the vehicle is traveling and while the vehicle is stopping.

[0043] Since the undercover 3 is not provided with a through-hole, it is possible to suppress disturbance of traveling wind under the vehicle floor. As a result, air resistance while the vehicle is traveling can be reduced, and aerodynamic performance of the vehicle 1 can be improved. In addition, since the undercover 3 is not provided with a through-hole for air inflow, it is possible to prevent a jumping stone JS from the front tire 6R or 6L from coming into contact with the catalyst 21 or the like through a through-hole. Protection function for components, such as the catalyst 21, covered with the undercover 3 can be improved.

[0044] (3) The catalyst 21 is arranged inside a center tunnel 23 under the vehicle floor, is provided in a portion of an exhaust pipe 2 (for example, connected to one end of the exhaust pipe 2), and has a larger diameter and a relatively higher thermal capacity than the exhaust pipe 2. The undercover 3 extends in such a manner as to straddle(cross) the center tunnel 23 in the vehicle width direction. The resin component is located on a vehicle outer side of the center tunnel 23 in the vehicle width direction. The layout is a layout where, even when the resin component is located at a position separated from the heat source, reflected heat can be easily transferred to the resin component via the undercover. However, even in such a layout, since the facing surface 3a of the undercover 3 is colored black or the like to suppress reflection and reflected heat can be reduced, temperature increase of the resin component due to reflected heat can be suppressed.

[0045] (4) The catalyst 21, the undercover 3, and the resin component (for example, the floor undercover 4) have overlapping areas OLA (see FIG. 6) overlapping one another in the vehicle longitudinal direction. The layout is a layout that minimizes distance from the catalyst 21, which serves as the heat source, and the facing surface 3a of the undercover 3, which serves as the reflection source, to the resin component and that causes the resin component to easily have a high temperature. However, even in such a layout, since the facing surface 3a of the undercover 3 is colored black or the like to suppress reflection and reflected heat can be reduced, temperature increase of the resin component due to reflected heat can be suppressed.

[0046] (5) The catalyst 21 is provided in a portion of the exhaust pipe 2. The resin component includes a floor undercover 4 that extends in a vehicle longitudinal direction at a position on a vehicle outer side of the exhaust pipe 2 in the vehicle width direction, the floor undercover 4 being arranged to be separated from a floor panel 8. The floor undercover 4 includes an arm portion 42 (see FIG. 3) to be fixed to the floor panel 8. The arm portion 42 is located in the overlapping area OLA.

[0047] In the layout, since the facing surface 3a of the undercover 3 is also colored black or the like to suppress reflection and reflected heat can be reduced, temperature increase of the arm portion 42 due to reflected heat can be suppressed. For example, even when the floor undercover 4 including the arm portion 42 is formed of an inexpensive material, such as polypropylene (PP) and polyethylene terephthalate (PET), the heat resistance of which is not so high, it becomes possible to arrange the arm portion 42 close to the heat source, and it also becomes possible to extend a portion of the floor undercover 4 other than the arm portions 42 toward the heat source side. Because of this configuration, it is possible to increase area of the floor undercover 4, and to improve the aerodynamic performance of the vehicle.

[0048] (6) The undercover 3 may be arranged only on a front side of a center in a vehicle longitudinal direction of the catalyst 21. A cross-sectional shape of the undercover 3 when viewed from a side of the vehicle may include unevenness (bead). The undercover 3 including a bead enables mechanical strength of the undercover 3 to be further improved. In addition, it is preferable that the facing surface 3a of the undercover 3, including the recessed portion 35 of the bead, be colored black or the like. This configuration can prevent aggregation of reflected heat by the recessed portion 35. It is possible to achieve both improvement of the mechanical strength of the undercover 3 and prevention of aggregation of reflected heat at the same time.

[0049] (7) The catalyst 21 may be a GPF. The resin component may include at least one of a harness 71 and a connector 72 of an exhaust gas temperature sensor 7 for the GPF. Even in such a form, temperature increase of the harness 71 and the connector 72 can be suppressed by the undercover 3 the facing surface 3a of which is colored black or the like, and such components can be thereby prevented from having a high temperature. In addition, it is possible to protect the exhaust gas temperature sensor 7 from a jumping stone JS (see FIG. 1).

[0050] (8) As illustrated in FIG. 4, the entire undercover 3 including the facing surface 3a may be made of metal. Using a heat-resistant metal enables the undercover 3 to be arranged close to the catalyst 21 and area of the undercover 3 to be increased. As a result, the aerodynamic performance can be improved. Note that although as the area of the undercover 3 increases, area of the facing surface 3a (reflecting surface of radiation) facing the heat source also increases, since the facing surface 3a is colored, for example, black or the like to suppress reflection, it is possible to suppress temperature increase of the resin component due to reflected heat. It is possible to achieve both increase in the aerodynamic performance and suppression of temperature increase of the resin component at the same time.

[0051] (9) An undercover 3 according to the embodiment of the present invention is an undercover for use under a vehicle floor attached under a vehicle floor and configured to cover a heat source (for example, a catalyst 21) located under the vehicle floor from below, the undercover 3 having a facing surface 3a facing the heat source is made of a metal, and at least a portion of the facing surface 3a is covered with a low-reflection material 31, the low-reflection material 31 having a lower reflectance of radiation than the metal. According to the configuration, the same advantageous effects as the configuration described in (1) can be achieved.Other Embodiments

[0052] As described above, the present invention was described through the embodiments, but the statements and drawings constituting a portion of this disclosure should not be construed as a limitation of the present invention. Various alternative embodiments and variations will be made obvious to those skilled in the art by the disclosure. For example, the low-reflection material 31 illustrated in FIG. 4 or 5 may be provided on, instead of the entire area of the facing surface 3a, a partial area of the facing surface 3a. For example, instead of coloring the entire facing surface 3a of the undercover 3 black or the like, only a partial area of the facing surface 3a may be colored black or the like. When the facing surface 3a of the undercover 3 includes a bead, only a partial area including the recessed portion 35 of the bead may be colored black or the like. Since even in such a form, it is possible to suppress reflection in an area colored black or the like on the facing surface 3a, reflected heat can be reduced to a certain extent.

[0053] As described above, it is needless to say that the present technology includes various embodiments and the like that are not described herein. At least one of various kinds of omission, replacement, and modification of the constituent elements can be performed without departing from the gist of the above-described embodiments. Advantageous effects described herein are only exemplifications and are not specifically limited, and other advantageous effects may be achieved.

Claims

1. A vehicle comprising:a heat source located under a vehicle floor;a first undercover located under the vehicle floor and configured to cover the heat source from below; anda resin component located under the vehicle floor,the resin component being located between the heat source and the first undercover in a vehicle vertical direction and located on a vehicle outer side of the heat source in a vehicle width direction, andthe first undercover having a facing surface facing the heat source being made of a metal and at least a portion of the facing surface being covered with a low-reflection material, the low-reflection material having a lower reflectance of radiation than the metal.

2. The vehicle according to claim 1, whereinthe low-reflection material is a heat-resistant paint layer or a black layer, a deeply colored layer, or a non-transparent layer formed by cation coating.

3. The vehicle according to claim 1, whereinthe first undercover is not provided with a through-hole to cause traveling wind to flow in.

4. The vehicle according to claim 1, whereinthe heat source is arranged inside a tunnel under the vehicle floor, is provided in a portion of an exhaust pipe, and has a larger diameter and a relatively higher thermal capacity than the exhaust pipe,the first undercover extends in such a manner as to straddle the tunnel in the vehicle width direction, andthe resin component is located on a vehicle outer side of the tunnel in the vehicle width direction.

5. The vehicle according to claim 1, whereinthe heat source, the first undercover, and the resin component have overlapping areas overlapping one another in the vehicle longitudinal direction.

6. The vehicle according to claim 5, whereinthe heat source is provided in a portion of an exhaust pipe,the resin component includes a second undercover that extends in a vehicle longitudinal direction at a position on a vehicle outer side of the exhaust pipe in the vehicle width direction, the second undercover being arranged to be separated from a vehicle floor surface,the second undercover includes an extended portion to be fixed on the vehicle floor surface, andthe extended portion is located in the overlapping area.

7. The vehicle according to claim 1, whereinthe first undercover is arranged only on a front side of a center in a vehicle longitudinal direction of the heat source, anda cross-sectional shape of the first undercover when viewed from a side of the vehicle includes unevenness.

8. The vehicle according to claim 1, whereinthe heat source is a GPF, andthe resin component includes at least one of a connector and a harness of an exhaust gas temperature sensor for the GPF.

9. The vehicle according to claim 1, whereinthe entire first undercover including the facing surface is made of the metal.

10. An undercover for use under a vehicle floor, comprising:the undercover being attached under a vehicle floor and configured to cover a heat source located under the vehicle floor from below, andthe undercover having a facing surface facing the heat source is made of a metal and at least a portion of the facing surface is covered with a low-reflection material, the low-reflection material having a lower reflectance of radiation than the metal.

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