Heat exchange device

Abstract

To improve soundproof performance to the surroundings and protection performance against intrusion of foreign matter such as a flying stone regardless of an arrangement place of a heat exchanger.SOLUTION: The box-shaped heat exchanger 20 includes a fan 26 attached to the heat exchanger 21 and configured to send air to the heat exchanger 21, a wall surface portion 20W surrounding the internal space 20S, and a sound absorbing member 30 attached to the wall surface portion 20W and configured to absorb sound generated from the fan 26. 20S.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a heat exchange device that houses a heat exchanger that exchanges heat with a vehicle component. [Background technology]

[0002] Vehicles are equipped with heat exchangers that exchange heat with vehicle components. For example, vehicles powered by an engine are equipped with heat exchangers such as radiators and oil coolers to keep the engine temperature within a normal range. Electric vehicles powered by a traction motor also have heat exchangers to keep the temperature of the motor and the battery, which is the power source for the motor, within normal ranges. For example, Patent Document 1 discloses a structure in which a heat exchanger is located below a cab in a truck that has a cab at the front of the vehicle. In a structure in which the heat exchanger is located below the cab, the area around the heat exchanger is shielded by the cab and various other components, so the noise of the fan that blows air to the heat exchanger is less likely to be transmitted to the surrounding area. In addition, flying stones are less likely to enter from the outside while the vehicle is traveling. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2018-34759 Summary of the Invention [Problem to be solved by the invention]

[0004] In recent years, due to the layout of trucks, structures have been considered in which the heat exchanger is located in a position other than under the cab. For example, in electric trucks using a motor as a drive source, the motor is not located under the cab, so the placement of the heat exchanger in a position other than under the cab has been considered.

[0005] However, in a structure where the heat exchanger is located somewhere other than under the cab, there is less obstruction around the heat exchanger compared to when the heat exchanger is located under the cab, which means that fan noise is more likely to be transmitted to the surrounding area of ​​the vehicle and flying stones are more likely to enter from the outside while the vehicle is running. Therefore, there is room for improvement in measures to prevent noise and flying stones from the heat exchanger. This invention was devised in consideration of the above-mentioned problems, and one of its objectives is to improve soundproofing against the surroundings and protection against the intrusion of foreign objects such as flying stones, regardless of the location of the heat exchanger. [Means for solving the problem]

[0006] The present invention has been made to solve at least part of the above problems, and can be realized as the following aspects or application examples.

[0007] (1) The heat exchange device according to this application example is a box-shaped heat exchange device having an internal space that houses a heat exchanger that exchanges heat with components mounted on a vehicle, and is equipped with a fan attached to the heat exchanger for blowing air to the heat exchanger, a wall portion that surrounds the internal space, and a sound-absorbing member attached to the wall portion for absorbing sound generated by the fan.

[0008] According to this application example, since the sound absorbing member is attached to the wall surface surrounding the internal space in which the heat exchanger is housed, it is possible to suppress the noise generated by the fan. In a structure in which the heat exchanger is located somewhere other than under the cab, there are fewer obstructions around the heat exchanger than in a structure in which the heat exchanger is located under the cab, so noise suppression tends to be more difficult. In this regard, in the heat exchanger device of the present invention, the internal space in which the heat exchanger is housed is surrounded by walls and sound-absorbing materials are provided on the walls, so even if the heat exchanger is located in a location other than under the cab where there are fewer obstructions, the sound generated by the fan is absorbed by the sound-absorbing materials on the walls, so noise is less likely to leak to the surrounding area.

[0009] As described above, since fan noise is less likely to leak to the surroundings, there is no need to restrict fan operation in consideration of fan noise, and it becomes easier to ensure the heat exchange performance of the heat exchanger. Furthermore, the walls of the interior space housing the heat exchanger prevent foreign objects such as flying stones from entering while the vehicle is in motion, which increases the protection of the heat exchanger even when the heat exchanger is installed in a location other than under the cab where there is little obstruction.

[0010] (2) In the heat exchange device according to this application example, the sound absorbing member may be provided with a through hole that allows air to pass through. According to this configuration, the provision of through holes in the sound absorbing member improves the air flow performance (breathability) of the sound absorbing member, making it easier to send air to the heat exchanger while suppressing fan noise, thereby improving the heat exchange performance of the heat exchanger. (3) In the heat exchange device according to (2) above, the wall portion may include an entrance / exit surface having an opening that connects the internal space with the outside, and the sound-absorbing member may be attached to the entrance / exit surface. With this configuration, a sound-absorbing member with a through hole is attached to the entrance / exit surface that has an opening connecting the internal space to the outside, making it easier to send air to the heat exchanger while suppressing fan noise, thereby improving the heat exchange performance of the heat exchanger.

[0011] (4) In the heat exchange device according to (2) above, the plurality of through holes may be arranged in parallel along the vertical direction of the vehicle, and the opening area of ​​the through holes arranged at the bottom may be smaller than that of the through holes arranged at the top. With this configuration, the opening area of ​​the through holes provided at the bottom is smaller than that of the through holes provided at the top, so even if through holes are provided in the sound-absorbing member, it is easy to prevent foreign objects such as flying stones from entering from below.

[0012] (5) In the heat exchange device according to (2) above, a plurality of the sound-absorbing members may be stacked on top of each other on the wall surface portion, and the through holes provided in the plurality of the sound-absorbing members may be arranged alternately at different positions in the vertical direction of the vehicle. With this configuration, multiple sound-absorbing members are stacked on top of each other on the wall surface, which increases sound absorption. Furthermore, the through holes of each sound-absorbing member are staggered in different positions in the vertical direction, which makes it easier to prevent the intrusion of foreign objects such as flying stones.

[0013] (6) In the heat exchange device according to (2) above, a plurality of the sound-absorbing members may be stacked on top of each other on the entry / exit surface, and the through holes provided in the plurality of the sound-absorbing members may be arranged alternately at different positions in the vertical direction of the vehicle. With this configuration, multiple sound-absorbing members are stacked on top of each other on the entrance / exit surface where the opening is provided, which makes it easier for air to circulate through the opening into the interior space and effectively suppresses noise leakage from the opening. Furthermore, since the through holes of each sound-absorbing member are alternately positioned at different positions in the vertical direction, it is easy to prevent the intrusion of foreign objects such as flying stones.

[0014] (7) In the heat exchange device according to (2) above, a plurality of the sound-absorbing members may be stacked on top of each other on the outer surface portion of the wall portion facing outward in the width direction of the vehicle, and the through holes provided in the plurality of the sound-absorbing members may be arranged alternately at different positions in the vertical direction of the vehicle. With this configuration, multiple sound-absorbing members are stacked on top of each other on the outer surface facing outward in the vehicle width direction, effectively suppressing noise leakage from the outer surface, which is easily exposed to the surroundings. Furthermore, the through holes of each sound-absorbing member are staggered in different positions in the vertical direction, making it easy to prevent the intrusion of foreign objects such as flying stones.

[0015] (8) In the heat exchange device according to this application example, a plurality of the sound absorbing members may be provided on both sides of the fan, that is, on one side and on the other side opposite to the one side. According to this configuration, the sound absorbing members are provided on both sides of the fan, thereby improving sound absorption. (9) In the heat exchange device according to this application example, the heat exchanger may be a radiator, and the fan may be a radiator fan provided in parallel with the radiator. With this configuration, it is possible to suppress noise generated by the radiator fan arranged in parallel with the radiator.

[0016] (10) In the heat exchange device according to this application example, the sound absorbing member may be formed of a sponge. According to this configuration, the sound absorbing member is made of sponge, which is easy to process and handle. (11) The heat exchange device according to this application example may be mounted behind the wheels of the vehicle. With this configuration, the area behind the wheels is less subject to layout restrictions, making it easier to ensure space for mounting the heat exchanger.

[0017] (12) The heat exchange device according to this application example may be disposed on the outer side of the vehicle in the vehicle width direction. With this configuration, the outer side of the vehicle in the vehicle width direction is less subject to layout restrictions, making it easier to secure space for installing the heat exchanger. Furthermore, the outer side of the vehicle in the vehicle width direction is more susceptible to wind as the vehicle moves, improving the efficiency of air flow into and out of the interior space. Therefore, the sound-absorbing member reduces noise in the surrounding area while improving heat exchange performance.

[0018] (13) In the heat exchange device according to (2) above, the sound absorbing member may be provided on the entire surface of the wall portion. According to this configuration, the sound absorbing material is provided on the entire surface of the wall portion, thereby improving sound absorption. (14) In the heat exchange device according to (13) above, the through holes may be formed in at least two places. With this configuration, the sound-absorbing material is provided on the entire surface of the wall surface, and through holes are formed in at least two locations, so that an intake port for taking in air from the outside into the internal space and an exhaust port for exhausting air from the internal space to the outside can be secured, making it easier to ensure breathability.

[0019] (15) In the heat exchange device according to (2) above, the through hole may extend along the vertical direction of the vehicle, and the opening area of ​​the through hole may be formed to become smaller as it extends downward. With this configuration, the opening area of ​​the through holes extending in the vertical direction is made smaller as they go downward, so even if through holes are provided in the sound-absorbing member, it is easy to prevent foreign objects such as flying stones from entering from below. [Effects of the Invention]

[0020] According to the present invention, it is possible to improve soundproofing against the surroundings and protection against the intrusion of foreign objects such as flying stones, regardless of the location of the heat exchanger. [Brief explanation of the drawings]

[0021] [Figure 1] 1 is a schematic plan view showing a heat exchanger according to a first embodiment together with a vehicle, with a portion of the heat exchanger shown in cross section. [Figure 2] 2(A) is an enlarged view of the heat exchanger of FIG. 1, and FIG. 2(B) is a cross-sectional view of the heat exchanger as seen from the arrow A in FIG. 2(A). [Figure 3] FIG. [Figure 4] 4 is a side view showing the outer surface of the heat exchange device together with the through holes of the sound absorbing member. FIG. [Figure 5] FIG. 10 is a side view of an outer surface portion (opening) according to a modified example. [Figure 6] FIG. 10 is a side view of an outer surface portion (opening) according to another modified example. [Figure 7] FIG. 10 is a side view of a sound absorbing member according to a modified example. [Figure 8] FIG. 10 is a side view of a sound-absorbing member according to another modified example. [Figure 9]10(A) to 10(D) are explanatory diagrams of modified examples of the shape of the through-holes provided in the sound absorbing member. DETAILED DESCRIPTION OF THE INVENTION

[0022] Each embodiment (aspect, application example) of the present invention will be described with reference to the drawings. The following embodiments are merely examples, and are not intended to exclude various modifications or applications of techniques not explicitly stated in these embodiments. The configurations of the following embodiments can be modified in various ways without departing from the spirit of the invention. Furthermore, they can be selected or combined as needed.

[0023] In the following description, the front-rear, left-right, and up-down directions are defined based on the vehicle. That is, the vehicle length direction corresponds to the "front-rear direction." The vehicle width direction corresponds to the "left-right direction," and left and right are defined based on the forward-facing posture of the vehicle. The vehicle height direction corresponds to the "up-down direction." In Figures 1 to 7, the "front-rear direction" is indicated by the symbol D1, the "vehicle width direction" by the symbol D2, and the "up-down direction" by the symbol D3. In addition, the side away from the vehicle (vehicle body) in the vehicle width direction D2 is referred to as the outer side in the vehicle width direction, and the opposite side is referred to as the inner side in the vehicle width direction. Specifically, in a top view of the vehicle, in the part to the left of the center line of the vehicle body, the left is the outer side in the vehicle width direction and the right is the inner side in the vehicle width direction. Similarly, in the part to the right of the center line of the vehicle body, the right is the outer side in the vehicle width direction and the left is the inner side in the vehicle width direction.

[0024] [1. Configuration] Fig. 1 is a schematic plan view showing a heat exchanger 20 according to one embodiment together with a vehicle 1. The vehicle 1 to which the heat exchanger 20 according to this embodiment is applied is, for example, an electric truck, and includes a cab 11 and side frames 12, and has four wheels: a pair of left and right front wheels 18 and a pair of left and right rear wheels 19. In the vehicle 1 in Fig. 1, the cab 11 is indicated by a two-dot chain line, and mounted structures are not shown.

[0025] First, the configuration of the vehicle 1 will be described. The cab 11 is mounted on side frames 12 at the front of the vehicle 1. The side frames 12 are the skeleton of the vehicle 1. As shown in FIG. 1, the vehicle 1 has a pair of left and right side frames 12 that extend in the front-to-rear direction D1 and are spaced apart from each other in the vehicle width direction D2. The pair of side frames 12 are connected to each other by multiple cross members (not shown) that extend in the vehicle width direction D2, and together with the cross members, support the cab 11 and any mounted equipment disposed behind the cab 11 from below.

[0026] A drive battery 13, a DC / DC converter 14, a heater (not shown) for the battery 13, a traveling motor 16, and an axle gear box 17 are arranged on the inner side in the vehicle width direction D2 of the pair of side frames 12 (between the side frames). The motor 16 includes an inverter (not shown). The battery 13 is a power source for the motor 16 that drives the vehicle 1, and is also called a high-voltage battery. The battery 13 is, for example, a lithium-ion battery or a nickel-metal hydride battery, and is a secondary battery that can supply a relatively high-voltage direct current (generally 200 V or higher). The battery 13 is disposed at a position closer to the front in the fore-and-aft direction D1. More specifically, the front end of the battery 13 is disposed below the cab 11.

[0027] A DC / DC converter 14, which is a DC voltage conversion device, is disposed behind the battery 13. The DC / DC converter 14, for example, boosts the voltage from an on-board charger (not shown) to charge the battery 13, or reduces the voltage of the battery 13 to output it to on-board accessories (such as a fan 26 (described later) and an auxiliary battery (not shown)). A motor 16 and an axle gearbox 17 are arranged behind the DC / DC converter 14. The motor 16 is an electric motor that operates using power supplied from the battery 13 to drive the vehicle 1, and is connected to a pair of rear wheels 19, transmitting power to the rear wheels 19 via an axle (not shown). The gearbox 17 includes gears that perform the function of transmitting the driving force of the motor 16.

[0028] The vehicle 1 is provided with a heat exchanger 21 for exchanging heat with components mounted on the vehicle. The heat exchanger 21 is housed in a heat exchange device 20. The heat exchanger 20 is a mounting device for mounting the heat exchanger 21 on the vehicle 1, and includes a box-shaped case body 20A having an internal space 20S for accommodating the heat exchanger 21. The case body 20A is a container for accommodating the heat exchanger 21, and is formed into a rectangular parallelepiped shape using, for example, a sheet metal member. Note that in FIG. 1, the case body 20A is depicted as a cross section along a horizontal plane.

[0029] In Fig. 1, multiple (here, two) heat exchangers 21 are arranged side by side along the front-rear direction D1 within the internal space 20S of the heat exchange device 20 (case body 20A). Note that each heat exchanger 21 may have a common configuration, and for ease of explanation, the heat exchangers 21 are given the same reference numeral and no distinction is made between them. In the following explanation, unless otherwise specified, when "heat exchanger 21" is written, it means each of the two heat exchangers 21.

[0030] 1 is disposed on the outer side (here, the right side) of the vehicle 1 in the vehicle width direction D2, and is disposed behind the front wheels (wheels) 18. Specifically, the heat exchanger 20 is attached to the side frame 12 via a bracket 22 with a gap (separately spaced) therebetween, in an orientation extending to the right (outside) of the right side frame 12, and is disposed between the front wheels 18 and the rear wheels 19. The heat exchanger 21 in the heat exchange device 20 is fixed to the case body 20A via a bracket 25. That is, the heat exchanger 21 is not directly attached to the side frame 12, but is attached to the outer side of the side frame 12 in the vehicle width direction, i.e., to the side of the vehicle 1, via the box-shaped case body 20A (box-shaped heat exchange device 20). As shown in FIG. 1, the heat exchange device 20 includes a fan 26 attached to the heat exchanger 21 for blowing air to the heat exchanger 21.

[0031] In a structure in which the heat exchanger 21 is mounted in a location other than below the cab 11 (here, on the outer side of the side frame 12 in the vehicle width direction, i.e., on the side of the vehicle 1), as described above, there are fewer obstructions around the heat exchanger compared to when the heat exchanger is disposed under the cab 11, which means that noise from the fan 26 is more likely to be transmitted to the surroundings of the vehicle 1 and flying stones may be more likely to enter from the outside while the vehicle is traveling. Therefore, the heat exchanger 20 of this embodiment has a configuration that enhances soundproofing to the surroundings and protection against the entry of foreign objects such as flying stones, as will be described later.

[0032] Here, a specific example of the heat exchanger 21 will be described. The heat exchanger 21 has a function of exchanging heat with components to be cooled, i.e., at least one of a function of heating and a function of cooling the components. In this embodiment, an example is given in which the heat exchanger 21 has a function of cooling the components. Specifically, the components to be cooled are the battery 13 and the motor 16, and the heat exchanger 21 is a radiator for cooling the battery 13 and the motor 16. As is well known, the radiator 21 is a device that exchanges heat with the battery 13 and the motor 16 via a fluid (refrigerant), and is a heat exchange unit (heat exchanger) through which the fluid (refrigerant) flows and cools the refrigerant by exchanging heat with outside air. The refrigerant may be cooling water, cooling oil, or the like.

[0033] The radiator 21 is connected to flow paths 23A and 23B for circulating the refrigerant between the radiator 21 and the battery 13 and between the radiator 21 and the motor 16. In FIG. 1, for example, one (the front radiator 21) of two radiators (heat exchangers) 21 housed in the heat exchange device 20 is connected to the flow path 23A, and the other (the rear radiator 21) is connected to the flow path 23B.

[0034] Each of the flow paths 23A, 23B is formed by a pipe for circulating a refrigerant. The flow path 23A is a circuit for circulating the refrigerant between the radiator 21 and the battery 13, and the flow path 23B is a circuit for circulating the refrigerant between the radiator 21 and the motor 16. In Fig. 1, the DC / DC converter 14 is also provided in the flow path 23A and is included in the components to be cooled. The gear box 17 is not provided in the flow path 23B and is not included in the components to be cooled. Pumps 24A and 24B are provided in the flow paths 23A and 23B, respectively, to pump the circulating refrigerant at a predetermined flow rate and to change the flow rate.

[0035] The radiator 21 of this embodiment is provided in a position parallel to the side frame 12. That is, the radiator 21 is accommodated in the internal space 20S of the heat exchange device 20 in a position in which the normal to the surface 21A (the surface having the largest area) that receives air substantially coincides with the left-right direction (vehicle width direction) D2, in other words, in which the surface 21A is substantially parallel to the front-rear direction D1. A fan (radiator fan) 26 is arranged in parallel with the radiator 21 with a gap between them on the inner side in the vehicle width direction D2 (on the left side in FIG. 1).

[0036] The fan 26 is an axial flow fan, and is a blower for actively sending air to the radiator 21. Specifically, the fan 26 is disposed on the inner side of the surface 21A of the radiator 21 in the vehicle width direction D2, with its rotation axis aligned with the vehicle width direction D2. The airflow direction of the fan 26 can be appropriately changed depending on the setting of the rotation direction of the fan 26. The airflow direction of the fan 26 is a direction from the inner side to the outer side in the vehicle width direction, or a direction from the outer side to the inner side. The rotation speed and direction of fan 26 are controlled by a control device (not shown) so as to obtain the required airflow volume and airflow direction depending on the speed of vehicle 1, the temperature of the parts to be cooled or the refrigerant, etc. The higher the rotation speed of fan 26, the greater the airflow volume that can be obtained, improving the heat exchange performance of radiator 21. However, on the other hand, the noise emitted by fan 26 tends to increase.

[0037] The fan 26 is attached to the radiator 21 via a fan shroud 27. The fan shroud 27 is a cylindrical cover member that surrounds the outer periphery of the fan 26. In this embodiment, the radiator 21 and the fan 26 are integrated via a fan shroud 27 to form a module (assembly). That is, the internal space 20S of the heat exchange device 20 accommodates a module in which the radiator 21, the fan 26, and the fan shroud 27 are integrated.

[0038] [2. Detailed configuration] The configuration of the heat exchanger 20 will be described with reference to FIGS. 1, the heat exchanger 20 has an internal space 20S in which a radiator 21 is housed, and includes a fan 26 attached to the radiator 21 and a wall surface portion 20W surrounding the internal space 20S. The wall surface portion 20W is a planar portion that forms the case body 20A of the heat exchanger 20.

[0039] As described above, the case body 20A of this embodiment is formed in a rectangular parallelepiped shape, and therefore, the wall surface portion 20W includes six surfaces, namely, a front surface portion 20F, a rear surface portion 20B, an outer surface portion 20R, an inner surface portion 20L, an upper surface portion 20U, and a lower surface portion 20D, as shown in Figures 2(A) and 2(B).

[0040] The front surface 20F is a surface that is disposed in front of the heat exchanger 21 and extends in the vehicle width direction D2 and the up-down direction D3. The rear surface portion 20B is a surface that is disposed rearward of the heat exchanger 21 and extends in the vehicle width direction D2 and the up-down direction D3, and can also be said to be a surface that is disposed opposite the front surface portion 20F with the heat exchanger 21 interposed therebetween.

[0041] The outer surface portion 20R is a surface that is disposed on the outer side (here, on the right side) of the heat exchanger 21 in the vehicle width direction D2 and extends in the front-rear direction D1 and the up-down direction D3. The inner surface portion 20L is a surface that is positioned inside (here, on the left side) in the vehicle width direction D2 relative to the heat exchanger 21 and extends in the front-to-rear direction D1 and the up-to-down direction D3, and can also be said to be a surface that is positioned opposite the outer surface portion 20R via the heat exchanger 21.

[0042] The upper surface portion 20U is a surface that is disposed above the heat exchanger 21 and extends in the front-rear direction D1 and the vehicle width direction D2. The lower surface portion 20D is a surface that is disposed below the heat exchanger 21 and extends in the front-rear direction D1 and the vehicle width direction D2, and can also be said to be a surface that is disposed opposite the upper surface portion 20U with the heat exchanger 21 interposed therebetween.

[0043] The heat exchanger 20 is attached to the side frame 12 with the front surface 20F facing forward, the outer surface 20R facing outward in the vehicle width direction D2, and the upper surface 20U facing upward. In this case, the rear surface 20B faces rearward, the inner surface 20L faces inward in the vehicle width direction D2, and the lower surface 20D faces downward. Therefore, the inner surface 20L facing inward in the vehicle width direction D2 is the attachment surface to the side frame 12.

[0044] With the heat exchanger 20 attached to the side frame 12, the outer side surface portion 20R is disposed at the outermost position in the vehicle width direction D2. As described above, in the rectangular parallelepiped heat exchanger 20, the outer side surface portion 20R is disposed on the outer side in the vehicle width direction D2, and therefore the outer side surface portion 20R is disposed further outward (at the outermost position) in the vehicle width direction D2 than other portions of the heat exchanger 20. It is preferable that the outer side surface portion 20R is disposed at the outermost position on the vehicle 1.

[0045] The outer side surface portion 20R is provided with an opening 29 that connects the internal space 20S to the outside. That is, in this heat exchanger 20, the outer side surface portion 20R forms an entrance / exit surface provided with the opening 29 that connects the internal space 20S to the outside. The "entrance / exit surface" is a surface through which air flows in and out between the internal space 20S and the outside via the opening 29. As described above, the outer side surface portion 20R is disposed at the outermost position in the vehicle 1, and therefore can be said to be the surface of the wall surface portion 20W that is most exposed to outside air and through which air flows in and out. That is, the internal space 20S of the heat exchange device 20 (case body 20A) is in communication with the outside at the opening 29, and is a shielded space in areas other than the opening 29. Note that the above-mentioned "outside" refers to the outside of the internal space 20S of the heat exchange device 20 (case body 20A).

[0046] The dimensions of the case body 20A, i.e., the dimensions of the front surface 20F, rear surface 20B, outer surface 20R, inner surface 20L, upper surface 20U and lower surface 20D, are set to appropriate dimensions to form an internal space 20S capable of accommodating two radiators 21, two fans 26 and two fan shrouds 27 arranged side by side in the fore-and-aft direction D1. Here, "capable of accommodating two radiators 21, fans 26 and fan shrouds 27" means that in the internal space 20S, each radiator 21, each fan 26 and each fan shroud 27 can be positioned with a gap between the front surface 20F, rear surface 20B, outer surface 20R, inner surface 20L, upper surface 20U and lower surface 20D, through which the sound-absorbing member 30 described below is interposed.

[0047] A sound absorbing member 30 is attached to the wall surface portion 20W to absorb the sound (noise) generated by the fan 26. As shown in Fig. 1, the sound absorbing member 30 is attached (for example, attached) to the surface of the wall surface portion 20W facing the internal space 20S (i.e., the surface facing the inside of the case body 20A), and is disposed in the gaps between the radiator 21, the fan 26, and the fan shroud 27 and the wall surface portion 20W.

[0048] The sound absorbing member 30 has a sound absorbing function of absorbing the sound generated by the fan 26 and reducing the leakage of sound to the surroundings, and is formed in a planar shape (plate or sheet shape) extending along the wall surface portion 20W. Well-known materials, shapes, and dimensions capable of efficiently absorbing the sound generated by the fan 26 are used for this sound absorbing member 30. For example, the sound-absorbing member 30 may be made of a porous sheet material having a thickness sufficient to efficiently absorb the sound generated by the fan 26. Specifically, the sound-absorbing member 30 may be made of a sponge sound-absorbing material. The sound-absorbing member 30 may have an appropriate shape that enhances sound absorption. For example, the sound-absorbing member 30 may have a shape that has a sound-absorbing surface on which numerous triangular pyramidal protrusions are formed.

[0049] The sound absorbing members 30 of this embodiment are provided on the entire inner surface of the wall surface portion 20W. Note that only some of the sound absorbing members 30 are labeled with reference numerals in Fig. 1 . In detail, as shown in Figures 2(A) and (B), an outer sound-absorbing member 30R is attached to the outer surface portion 20R, an inner sound-absorbing member 30L is attached to the inner surface portion 20L, a front sound-absorbing member 30F is attached to the front surface portion 20F, a rear sound-absorbing member 30B is attached to the rear surface portion 20B, an upper sound-absorbing member 30U is attached to the upper surface portion 20U, and a lower sound-absorbing member 30D is attached to the lower surface portion 20D.

[0050] Each sound absorbing member 30 is provided with a through hole 31 for allowing air to pass through. The through holes 31 are provided to ensure an air flow passage at the location where the sound absorbing member 30 is provided. That is, the sound absorbing member 30 of this embodiment has a sound absorbing function, and is configured so that the through holes 31 ensure air flow (breathability). The through-hole 31 is formed as a cylindrical through-hole (opening) that penetrates the sound absorbing member 30 from one surface to the other surface along the vehicle width direction D2.

[0051] 2(A) and 2(B) have two or more small through holes 31 arranged side by side in the front-to-rear direction D1 and the up-down direction D3. That is, two or more through holes 31 are provided in all of the multiple sound absorbing members 30 provided on the entire surface of the wall surface portion 20W. Here, at least one of the two or more through holes 31 functions as an intake port that takes in air from the outside into the internal space 20S, and at least another functions as an exhaust port that exhausts air from the internal space 20S to the outside.

[0052] The size, shape, and arrangement of the through holes 31 in each sound-absorbing member 30, as well as the number of through holes 31 formed in one sound-absorbing member 30, are set appropriately taking into consideration the air permeability (breathability) and sound absorption. The size of the through holes 31 refers to the area of ​​the opening (opening area) when the through holes 31 are viewed from the axial direction (here, the direction corresponding to the vehicle width direction D2). For example, the larger the size of the through holes 31, the higher the breathability, but it is thought that this also increases the likelihood of foreign objects such as flying stones entering. In other words, it is preferable to set the size of each through hole 31 so as to ensure both breathability and protection against the entry of foreign objects such as flying stones.

[0053] Therefore, the opening area of ​​the through holes 31 of the sound absorbing member 30 is smaller for the through holes 31 provided at the lower part than for the through holes 31 provided at the upper part. Fig. 3 is a side view of the sound absorbing member 30 (here, for example, sound absorbing member 30RA) as viewed from the vehicle width direction D2. Each through hole 31 shown in Fig. 3 is formed in a substantially circular shape as viewed from the vehicle width direction D2. Note that in Fig. 3, only some of the through holes 31 are labeled with reference numerals.

[0054] 3, in a vertical row of a plurality of (six in this example) through holes 31 arranged side by side in the up-down direction D3, the opening area of ​​the through holes 31 gradually decreases toward the bottom. In this way, a configuration in which the opening area of ​​the through holes 31 decreases toward the bottom can be said to be a configuration that improves protection at the bottom where foreign objects such as flying stones can easily enter, and also improves air circulation at the top where foreign objects such as flying stones cannot easily enter because the opening area can be made larger. In addition, in the horizontal row of the plurality of (eight in this example) through-holes 31 arranged in parallel along the front-rear direction D1, the opening area of ​​the through-holes 31 is set to be constant along the front-rear direction.

[0055] 2(A) and 2(B), the external sound absorbing member 30R of the outer side surface portion 20R is provided with a plurality (two in this example) of sound absorbing members 30RA and 30RB stacked one on top of the other. Of the sound absorbing members 30RA and 30RB, the sound absorbing member 30RA is disposed on the outer side in the vehicle width direction D2, i.e., adjacent to the outer side surface portion 20R. The sound absorbing member 30RB is disposed adjacent to the sound absorbing member 30RA on the inner side in the vehicle width direction D2 with a gap therebetween. That is, the two sound absorbing members 30RA, 30RB are provided in two tiers spaced apart from each other in the vehicle width direction D2 relative to the outer surface portion 20R.

[0056] Here, the outer surface portion 20R and the external sound absorbing member 30R will be described in detail. 4 is a side view showing the opening 29 of the outer side surface portion 20R together with the sound absorbing member 30RA arranged on the outer side in the vehicle width direction D2 of the outer sound absorbing member 30R. In FIG. 4, the sound absorbing member 30RA is drawn with a dashed line. As shown in FIG. 4, the openings 29 in the outer surface portion 20R have shapes corresponding to the plurality of through holes 31 in FIG. 3 and are formed at positions corresponding to the plurality of through holes 31. Specifically, as shown in FIG. 4, the outer surface portion 20R has a plurality of openings 29 formed so as to overlap the plurality of through holes 31, respectively, when viewed from the outside in the vehicle width direction D2. Each opening 29 is formed so as to overlap one of the through holes 31. Each opening 29 has a shape and size corresponding to the corresponding through hole 31. That is, each opening 29 is formed in a substantially circular shape when viewed from the vehicle width direction D2 and has substantially the same diameter as the corresponding through hole 31. In FIG. 4, the diameter of the openings 29 is set slightly larger than the diameter of the through hole 31. Furthermore, like the corresponding through hole 31, each opening 29 in the outer surface portion 20R is formed so that the opening area decreases downward. This improves protection in the lower area where foreign objects such as flying stones are likely to enter, and improves air circulation in the upper area where foreign objects such as flying stones are less likely to enter because the opening area can be made larger.

[0057] As described above, the outer surface portion 20R forms an entrance / exit surface provided with the opening 29 that connects the internal space 20S with the outside. Therefore, it can be said that a plurality of (here, two) sound-absorbing members 30RA and 30RB are provided on the entrance / exit surface in a stacked manner. While the opening 29 is an air vent through which air flows, it is also a location where noise from the fan 26 is likely to leak to the surrounding area and can easily become an intrusion point for foreign objects such as flying stones to enter from the outside. Therefore, in the heat exchange device 20 of this embodiment, as the external sound-absorbing member 30R corresponding to the outer surface portion 20R, two sound-absorbing members 30RA and 30RB having through holes 31 as described above are arranged in two layers, and it is preferable that the through holes 31 provided in the sound-absorbing members 30RA and 30RB are arranged alternately at different positions in the vertical direction D3.

[0058] "Alternately arranged" means that the through holes 31 of the sound absorbing member 30RA and the through holes 31 of the sound absorbing member 30RB are arranged (formed) in positions that do not overlap in the up-down direction D3 when viewed from the vehicle width direction D2. In other words, when viewed from the outside in the vehicle width direction D2, the through holes 31 of the sound absorbing member 30RA are arranged to overlap an area other than the through holes 31 of the sound absorbing member 30RB. Therefore, even if the through holes 31 of the sound absorbing member 30RA are arranged to overlap the openings 29 of the outer surface portion 20R in the vehicle width direction D2 and foreign objects such as flying stones can enter the area, the wall surfaces of the sound absorbing member 30RB will prevent the foreign objects such as flying stones from reaching the interior space 20S.

[0059] In addition, the inner sound-absorbing member 30L, the front sound-absorbing member 30F, the rear sound-absorbing member 30B, the upper sound-absorbing member 30U and the lower sound-absorbing member 30D are all provided in one stage corresponding to each surface portion other than the outer surface portion 20R (inner surface portion 20L, front surface portion 20F, rear surface portion 20B, upper surface portion 20U and lower surface portion 20D). Furthermore, among the multiple sound-absorbing members 30, the outer sound-absorbing member 30R provided on the outer surface portion 20R and the inner sound-absorbing member 30L provided on the inner surface portion 20L can be said to be provided on both sides of one side of the fan 26 (outside in the vehicle width direction D2) and the other side opposite to that side (inside in the vehicle width direction D2).

[0060] [3. Actions and Effects] (1) According to the heat exchange device 20 of the above embodiment, the sound absorbing member 30 is attached to the wall portion 20W surrounding the internal space 20S in which the heat exchanger 21 is housed, so that the sound generated by the fan 26 can be suppressed. As described above, in a structure in which heat exchanger 21 is disposed in a location other than under the cab, noise tends to be more difficult to suppress than in a structure in which heat exchanger 21 is disposed under the cab because there are fewer obstructions around heat exchanger 21. In this regard, in heat exchanger device 20 of the present invention, internal space 20S in which heat exchanger 21 is housed is surrounded by wall surface portion 20W and sound-absorbing member 30 is provided on wall surface portion 20W. Therefore, even if heat exchanger device 20 is disposed in a location other than under the cab where there are fewer obstructions, sound generated from fan 26 is absorbed by sound-absorbing member 30, and noise is less likely to leak to the surroundings.

[0061] As described above, since the noise of the fan 26 is unlikely to leak to the surroundings, it is no longer necessary to suppress the operation of the fan 26 in consideration of the noise of the fan 26, and the heat exchange performance of the heat exchanger 21 can be easily ensured. Furthermore, the wall surface portion 20W of the internal space 20S housing the heat exchanger 21 prevents foreign objects such as flying stones from entering while the vehicle is in motion. Therefore, even if the heat exchanger 20 is disposed in a location other than under the cab where there are few obstructions, the heat exchanger 21 is more protected.

[0062] (2) In the heat exchange device 20 according to the above embodiment, the sound absorbing member 30 is provided with the through holes 31 that allow air to pass through, thereby improving the air circulation performance (breathability) of the sound absorbing member 30. This makes it easier to send air to the heat exchanger 21 while suppressing the noise of the fan 26, thereby improving the heat exchange performance of the heat exchanger 21.

[0063] (3) Furthermore, in the heat exchange device 20 according to the above embodiment, a sound-absorbing member 30 having a through hole 31 is attached to the entrance / exit surface (external surface portion 20R) on which an opening 29 is provided that connects the internal space 20S with the outside. This makes it easier to send air to the heat exchanger while suppressing fan noise, thereby improving the heat exchange performance of the heat exchanger. (4) Furthermore, in the heat exchange device 20 according to the above embodiment, the opening area of ​​the through holes 31 provided at the bottom is smaller than that of the through holes 31 provided at the top. Therefore, even if the sound-absorbing member 30 has through holes 31, it is easy to prevent foreign objects such as flying stones from entering from below.

[0064] (5) In the heat exchanger 20 according to the above embodiment, the sound absorbing properties are enhanced by providing a plurality of sound absorbing members 30 (sound absorbing members 30RA, 30RB) stacked on top of each other on the wall surface portion 20W. Furthermore, the through holes 31 of the sound absorbing members 30 (sound absorbing members 30RA, 30RB) are alternately arranged at different positions in the up-down direction D3, which makes it easier to prevent the intrusion of foreign objects such as flying stones. (6) In the heat exchange device 20 according to the above embodiment, a plurality of sound-absorbing members 30 are provided on the entrance / exit surface (exterior surface portion 20R) on which the openings 29 are formed, thereby facilitating air circulation into the interior space 20S through the openings 29 and effectively suppressing noise leakage from the openings 29. Furthermore, the through holes 31 of each sound-absorbing member 30 (sound-absorbing members 30RA, 30RB) are alternately arranged at different positions in the vertical direction, which makes it easy to prevent foreign objects such as flying stones from entering.

[0065] (7) In the heat exchange device 20 according to the above embodiment, the sound-absorbing members 30 (sound-absorbing members 30RA, 30RB) are stacked on the outer surface portion 20R facing outward in the vehicle width direction D2, thereby effectively suppressing noise leakage from the outer surface portion 20R, which is likely to be exposed to the surroundings. Furthermore, the through-holes 31 of the sound-absorbing members 30 (sound-absorbing members 30RA, 30RB) are alternately arranged at different positions in the vertical direction, which makes it easy to prevent foreign objects such as flying stones from entering.

[0066] (8) In the heat exchange device 20 according to the above embodiment, multiple sound-absorbing members 30 (external sound-absorbing members 30R, internal sound-absorbing members 30L) are provided on both sides of the fan 26, one side (outside the vehicle width direction D2) and the other side (inside the vehicle width direction D2), thereby improving sound absorption. (9) In the heat exchange device 20 according to the above embodiment, noise generated by the radiator fan 26 arranged in parallel with the radiator 21 can be suppressed. (10) In the heat exchanger 20 according to the above embodiment, the sound absorbing member 30 is made of sponge, which is easy to process and handle.

[0067] (11) The heat exchange device 20 according to the above embodiment may be mounted behind the wheels 18 (front wheels) of the vehicle 1. According to this configuration, the area behind the wheels is less subject to layout restrictions, making it easier to ensure space for mounting the heat exchanger 20. (12) The heat exchange device 20 according to the embodiment described above is disposed on the outer side of the vehicle 1 in the vehicle width direction D2. The outer side of the vehicle 1 in the vehicle width direction D2 is less subject to layout restrictions, making it easier to secure space for installing the heat exchange device 20. Furthermore, the outer side of the vehicle 1 in the vehicle width direction D2 is more susceptible to wind while the vehicle 1 is traveling, increasing the efficiency of air being drawn in and out of the interior space 20S. Therefore, the sound-absorbing member 30 reduces noise in the surrounding area and improves heat exchange performance.

[0068] (13) In the heat exchanger 20 according to the above embodiment, the sound absorbing member 30 is provided on the entire surface of the wall surface portion 20W, which improves sound absorption. (14) In the heat exchange device 20 according to the above embodiment, the sound-absorbing member 30 is provided on the entire surface of the wall portion 20W, and the through holes 31 are formed in at least two locations. This ensures an intake port for taking in air from the outside into the internal space 20S and an exhaust port for exhausting air from the internal space 20S to the outside, making it easy to ensure good ventilation.

[0069] [4. Other] The above-described configuration of the heat exchanger 20 is an example. For example, the opening of the outer surface portion 20R is not limited to a circular shape as shown in Fig. 4 above, but may be a slit-shaped opening 29A extending in the front-rear direction D1 as shown in a modified example in Fig. 5. The sound absorbing member 30RA is depicted by a dashed line. In this case, a plurality of (six in this example) slit-shaped openings 29A are arranged in a row along the up-down direction D3. Each opening 29A is formed in a position and size that overlaps with a plurality of through holes 31 arranged in a row in the front-rear direction D1. In this case, each opening 29A in the outer surface portion 20R is formed so that the opening area becomes smaller toward the bottom, similar to the corresponding through holes 31. In other words, each opening 29A can be said to be formed in a shape that corresponds to the plurality of through holes 31 and in a position that corresponds to each through hole 31.

[0070] 6 shows a slit-shaped opening 29B in the outer side surface portion 20R according to another modified example. In FIG. 6, the sound absorbing member 30RA and the through-hole 31 are depicted by dashed lines. 6 has a shape corresponding to the plurality of through holes 31, but is not formed at a position corresponding to each of the through holes 31. That is, the plurality of openings 29B overlap with the through holes 31 in some portions and do not overlap with the through holes 31 in other portions. The size (opening area) of each opening 29B is constant in the vertical direction D3. In this case, since the shape, size, and position of each opening 29B do not correspond to the through holes 31, the processing of forming the openings 29B in the outer surface portion 20R is simple.

[0071] Furthermore, for example, the shape of the multiple through holes 31 provided in the sound-absorbing member 30 is not limited to the above example. For example, as shown in Fig. 7, the sound-absorbing member 30 may be provided with a vertically elongated slit-shaped through hole 310 extending along the up-down direction D3, and multiple (here, seven) such vertically elongated slit-shaped through holes 310 may be arranged side by side in the front-rear direction D1. In this case, the opening area of ​​the through hole 310 may be formed to become smaller as it extends downward. According to this configuration, the opening area of ​​the through holes 310 extending in the vertical direction is made smaller as it goes downward, so that even if the sound-absorbing member 30 has vertically elongated slit-shaped through holes 310, it is easy to prevent foreign objects such as flying stones from entering from below.

[0072] 8, the sound absorbing member 30 may be provided with a horizontally elongated slit-shaped through hole 311 extending along the front-rear direction D1, and a plurality of such horizontally elongated slit-shaped through holes 311 (seven in this example) may be arranged side by side in the up-down direction D3. In this case, the opening area of ​​the lower through holes 311 may be smaller than that of the upper through holes 311. In this case as well, the effect of easily preventing the intrusion of foreign objects such as flying stones from below can be obtained.

[0073] 9A to 9D illustrate various modified examples of the shape of the through holes. FIG. 9A illustrates a configuration in which a plurality of square-shaped through holes 312 are provided along the vertical direction D3. FIG. 9B illustrates a configuration in which a plurality of triangular through holes 313 are provided along the vertical direction D3. FIG. 9C illustrates a configuration in which a plurality of circular through holes 314 are provided along the vertical direction D3, and the opening area of ​​each through hole 314 arranged in the vertical direction D3 is constant. FIG. 9D illustrates a configuration in which a through hole 315 formed in a vertically elongated slit shape is provided, and the opening area of ​​the through hole 315 is constant at the top and bottom. The shape of the through-hole is not limited to the illustrated example, and may be any shape.

[0074] Furthermore, in the heat exchanger 20 according to the above embodiment, the sound absorbing members 30 on each surface of the wall portion 20W are each configured to have a through hole 31, but the sound absorbing members 30 may only have a portion of the through holes 31. Furthermore, the sound absorbing members 30 may not have through holes 31. Furthermore, the sound absorbing members 30 are not limited to being provided on the entire surface of the wall surface portion 20W, and may be provided only on a portion of the wall surface portion 20W. For example, the sound absorbing members 30 may be provided only on the outer surface portion 20R and the inner surface portion 20L of the wall surface portion 20W, and the sound absorbing members 30 may not be provided on the front surface portion 20F, the rear surface portion 20B, the upper surface portion 20U, and the lower surface portion 20D.

[0075] Furthermore, the shape of the case body 20A of the heat exchanger 20 is not limited to a rectangular parallelepiped shape. The number of heat exchangers (radiators) 21 and fans 26 housed in the heat exchange device 20 may be two or more, or may be just one. Furthermore, a plurality of heat exchange devices 20 may be installed in one vehicle 1. The plurality of heat exchange devices 20 may be arranged side by side on one of the left and right sides of the vehicle 1, for example, or may be distributed on both the left and right sides of the vehicle 1.

[0076] Furthermore, the heat exchanger 21 is not limited to a radiator, and may be any heat exchanger, such as an oil cooler, that exchanges heat with components mounted on the vehicle 1. Furthermore, the component to be cooled may be at least one of the battery 13 and the motor 16. The location where the heat exchange device 20 is mounted is not limited to the outer side of the side frame 12 in the vehicle width direction. Furthermore, the internal space 20S of the heat exchange device 20 may house members other than the radiator 21, the fan 26, and the fan shroud 27, such as the pumps 24A and 24B. The vehicle 1 is not limited to an electric vehicle that generates little running noise, but may also be an engine vehicle equipped with an engine as a drive source. In this case, the engine is an example of a component to be cooled. Furthermore, a heater may be provided in the heat exchanger 20. That is, when traveling in cold regions, the heater may be operated when the battery temperature is low to heat the coolant in the radiator, thereby warming the battery.

[0077] Below, supplementary notes regarding this embodiment will be disclosed. (Appendix 1) A box-shaped heat exchange device having an internal space in which a heat exchanger that exchanges heat with components mounted on a vehicle is housed, a fan attached to the heat exchanger for blowing air to the heat exchanger; a wall portion surrounding the internal space; a sound absorbing member attached to the wall surface portion for absorbing the sound generated by the fan; A heat exchange device characterized by: (Appendix 2) The sound absorbing member has through holes that allow air to pass through. 2. The heat exchange device according to claim 1, (Appendix 3) The wall portion includes an entrance / exit surface provided with an opening that communicates the internal space with the outside, The sound absorbing member is attached to the entrance / exit surface. 3. The heat exchange device according to claim 1 or 2, (Appendix 4) A plurality of the through holes are arranged in parallel along the vertical direction of the vehicle, The opening area of ​​the through holes provided at the lower part is smaller than that of the through holes provided at the upper part. 4. The heat exchange device according to claim 2 or 3. (Appendix 5) A plurality of the sound absorbing members are provided on the wall surface portion in a stacked manner, The through holes provided in the plurality of sound absorbing members are alternately arranged at different positions in the up-down direction of the vehicle. 5. The heat exchanger according to any one of claims 2 to 4, wherein: (Appendix 6) A plurality of the sound absorbing members are provided on the entrance / exit surface in a stacked manner, The through holes provided in the plurality of sound absorbing members are alternately arranged at different positions in the up-down direction of the vehicle. 6. The heat exchanger according to any one of claims 3 to 5, wherein: (Appendix 7) a plurality of the sound absorbing members are provided on an outer surface portion of the wall surface portion facing outward in a vehicle width direction of the vehicle, The through holes provided in the plurality of sound absorbing members are alternately arranged at different positions in the up-down direction of the vehicle. 7. The heat exchanger according to any one of claims 2 to 6, wherein: (Appendix 8) A plurality of the sound absorbing members are provided on both sides of the fan, one side and the other side opposite to the one side. 8. The heat exchanger according to any one of claims 1 to 7, wherein: (Appendix 9) the heat exchanger is a radiator; The fan is a radiator fan provided in parallel with the radiator. 9. The heat exchanger according to any one of claims 1 to 8, wherein: (Appendix 10) The sound absorbing member is made of sponge. 10. The heat exchanger according to any one of claims 1 to 9, wherein: (Appendix 11) mounted behind the wheels of the vehicle 11. The heat exchanger according to any one of claims 1 to 10, wherein: (Appendix 12) arranged on the outer side in the vehicle width direction of the vehicle 12. The heat exchanger according to any one of claims 1 to 11, wherein: (Appendix 13) The sound absorbing member is provided on the entire surface of the wall portion. 13. The heat exchanger according to any one of claims 2 to 12, wherein: (Appendix 14) The through holes are formed at at least two locations. 15. The heat exchanger according to claim 14, (Appendix 15) The through hole extends along the vertical direction of the vehicle, The opening area of ​​the through-hole is formed to become smaller as it goes downward. 15. The heat exchanger according to any one of claims 2 to 14, wherein: [Explanation of symbols]

[0078] 1 vehicle 11 Cab 12 Side frame 13 Battery 14 DC / DC converter 16 motors 17 Gearbox 18 Front wheel (wheel) 19 Rear wheel (wheel) 20 Heat exchange equipment 20A case body 20W wall unit 20F front part 20R Outer surface (entry / exit surface) 20B Rear part 20U top part 20D bottom part 20L inner side 20S interior space 21 Radiator (heat exchanger) 21A side 22 Bracket 23A, 23B flow path 24A, 24B pump 25 Bracket 26 Fan (radiator fan) 27 Fan shroud 29 Aperture 29A, 29B Slit-shaped opening (opening) 30 Sound-absorbing materials 30L internal sound absorbing material 30R, 30RA, 30RB External sound absorbing material (sound absorbing material) 30F Front sound absorbing material (sound absorbing material) 30B Rear sound absorbing member (sound absorbing member) 30D Lower sound absorbing material (sound absorbing material) 30U Upper sound absorbing material (sound absorbing material) 31 Through hole 310, 311, 312, 313, 314, 315 Through holes

Claims

1. A box-shaped heat exchange device having an internal space in which a heat exchanger that exchanges heat with components mounted on a vehicle is housed, a fan attached to the heat exchanger for blowing air to the heat exchanger; a wall portion surrounding the internal space; a sound absorbing member attached to the wall surface portion for absorbing the sound generated by the fan; A heat exchange device characterized by:

2. The sound absorbing member has through holes that allow air to pass through.

2. The heat exchange device according to claim 1.

3. The wall portion includes an entrance / exit surface provided with an opening that communicates the internal space with the outside, The sound absorbing member is attached to the entrance / exit surface.

3. The heat exchange device according to claim 2.

4. A plurality of the through holes are arranged in parallel along the vertical direction of the vehicle, The opening area of ​​the through holes provided at the lower part is smaller than that of the through holes provided at the upper part.

3. The heat exchange device according to claim 2.

5. A plurality of the sound absorbing members are provided on the wall surface portion in a stacked manner, The through holes provided in the plurality of sound absorbing members are alternately arranged at different positions in the up-down direction of the vehicle.

3. The heat exchange device according to claim 2.

6. A plurality of the sound absorbing members are provided on the entrance / exit surface in a stacked manner, The through holes provided in the plurality of sound absorbing members are alternately arranged at different positions in the up-down direction of the vehicle.

4. The heat exchange device according to claim 3.

7. a plurality of the sound absorbing members are provided on an outer surface portion of the wall surface portion facing outward in a vehicle width direction of the vehicle, The through holes provided in the plurality of sound absorbing members are alternately arranged at different positions in the up-down direction of the vehicle.

3. The heat exchange device according to claim 2.

8. A plurality of the sound absorbing members are provided on both sides of the fan, one side and the other side opposite to the one side.

2. The heat exchange device according to claim 1.

9. the heat exchanger is a radiator; The fan is a radiator fan provided in parallel with the radiator.

2. The heat exchange device according to claim 1.

10. The sound absorbing member is made of sponge.

2. The heat exchange device according to claim 1.

11. mounted behind the wheels of the vehicle 2. The heat exchange device according to claim 1.

12. arranged on the outer side in the vehicle width direction of the vehicle 2. The heat exchange device according to claim 1.

13. The sound absorbing member is provided on the entire surface of the wall portion.

3. The heat exchange device according to claim 2.

14. The through holes are formed at at least two locations.

14. The heat exchange device according to claim 13.

15. The through hole extends along the vertical direction of the vehicle, The opening area of ​​the through-hole is formed to become smaller as it goes downward.

3. The heat exchange device according to claim 2.

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