Fan shroud

Abstract

To improve sound insulation against surroundings regardless of an arrangement place of a heat exchanger.SOLUTION: The fan shroud 3 includes a cylindrical part 3 4 forming a cylindrical shape surrounding an outer periphery of the fan 3 2, an attachment part 3 5 attached to one end of the cylindrical part 3 4 so as to cover the heat exchanger 3 1, and a resonance chamber 3 7 provided on a side opposite to the fan 3 2 and the heat exchanger 3 1 with respect to the cylindrical part 3 4 and the attachment part 3 5, and having a hollow pipe-shaped neck part 3 8 for communicating the resonance chamber 3 7 and the cylindrical part 3 4.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a fan shroud that surrounds a fan attached to a heat exchanger that exchanges heat with vehicle components. [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 are also equipped with heat exchangers to keep the temperature of the motor and the battery, which is the power source for the motor, within normal ranges. Some such heat exchangers are equipped with fans for blowing air. For example, Patent Document 1 discloses a structure in which a heat exchanger is disposed below the cab of a truck having a cab at the front of the vehicle. In a structure in which the heat exchanger is disposed below the cab, the area around the heat exchanger is shielded by shielding objects such as the cab and various parts, so the noise of the fan that blows air to the heat exchanger is less likely to be transmitted to the surrounding area. [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 driven by a motor, 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, so fan noise is more likely to be transmitted to the surrounding area of ​​the vehicle. Therefore, there is room for improvement in noise reduction measures for the heat exchanger. The present invention has been devised in view of the above-mentioned problems, and one of its objects is to improve soundproofing against the surroundings 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 fan shroud according to this application example is a fan shroud that is attached to a heat exchanger that exchanges heat with components mounted on a vehicle and surrounds the outer periphery of a fan for blowing air to the heat exchanger, and includes: a cylindrical portion that forms a cylindrical part that surrounds the outer periphery of the fan; a mounting portion that is connected to the cylindrical portion and attached so as to cover the heat exchanger; and a resonator that is provided on the opposite side of the fan and heat exchanger with respect to the cylindrical portion and the mounting portion, and has a resonance chamber that has a space inside that resonates the sound emitted by the fan, and a hollow tubular neck portion that connects the resonance chamber and the cylindrical portion.

[0008] According to this application example, the resonator is provided on the fan shroud that surrounds the outer periphery of the fan, so that the noise generated by the fan can be blocked by the resonator. The resonator can be designed to exhibit noise-canceling performance for a specific frequency band depending on the structure, so it is possible to muffle a specific frequency band of the noise generated by the fan. In structures where the heat exchanger is located somewhere other than under the cab, there are fewer obstructions around the heat exchanger than in structures where the heat exchanger is located under the cab, making it difficult to suppress noise.In this regard, the heat exchanger with a fan shroud of the present invention can block noise and muffle specific frequency bands using the resonator in the fan shroud, so even if it is located in a location other than under the cab where there are fewer obstructions, noise generated by the fan is less likely to leak to the surrounding area. [Effects of the Invention]

[0009] According to the present invention, soundproofing against the surroundings can be improved regardless of the location of the heat exchanger. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 2 is a side view of a heat exchanger unit including a fan shroud according to an embodiment. [Figure 2] 2 is a cross-sectional view of the heat exchanger unit of FIG. 1 as viewed from the arrow A. [Figure 3] FIG. 2 is a schematic plan view showing the heat exchanger unit of FIG. 1 together with a vehicle. [Figure 4] 10A and 10B are explanatory diagrams of modified examples of the fan shroud. DETAILED DESCRIPTION OF THE INVENTION

[0011] 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.

[0012] 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 4, 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.

[0013] [1. Configuration] Fig. 1 is a side view of a heat exchanger unit 30 including a fan shroud 33 according to one embodiment, as viewed from the outside in the vehicle width direction D2. The heat exchanger unit 30 shown in Fig. 1 is a module (assembly) that integrates a heat exchanger 31 for exchanging heat with components mounted on a vehicle, a fan 32 attached to the heat exchanger 31 for blowing air to the heat exchanger 31, and a fan shroud 33 that surrounds the outer periphery of the fan 32. In Fig. 1, the heat exchanger 31 is depicted by a dashed line. The heat exchanger unit 30 of FIG. 1 includes one heat exchanger 31, one fan 32, and one fan shroud 33, and has a substantially square outline when viewed in the vehicle width direction D2.

[0014] FIG. 3 is a schematic plan view showing the heat exchanger unit 30 to which the fan shroud 33 shown in FIG. 1 is applied, together with the vehicle 1. As shown in FIG. 1 is mounted on a vehicle 1. First, the overall configuration of the vehicle 1 to which the fan shroud 33 according to this embodiment is applied will be described with reference to FIG.

[0015] The vehicle 1 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. 3, the cab 11 is indicated by a two-dot chain line, and mounted structures are not shown. 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. 3, 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.

[0016] 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.

[0017] 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 32 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.

[0018] A heat exchanger unit 30 including a heat exchanger 31 for exchanging heat with components mounted on the vehicle 1 is mounted on the right side of the right side frame 12. The heat exchanger unit 30 is housed in a box-shaped heat exchanger device 20. The heat exchanger device 20 is a mounting device for mounting a heat exchanger unit 30 including a heat exchanger 31 on a vehicle 1, and includes a box-shaped case body 20A having an internal space 20S for accommodating the heat exchanger 31. The case body 20A is formed into a rectangular parallelepiped shape using, for example, a sheet metal member. Note that in FIG. 3, the case body 20A is depicted as a cross section along a horizontal plane.

[0019] 3, one heat exchanger unit 30 is housed in an internal space 20S of a heat exchanger device 20 (case body 20A). The heat exchanger device 20 is disposed on the outer side (here, the right side) in the vehicle width direction D2 of the vehicle 1, and is disposed behind the front wheels (wheels) 18. Specifically, the heat exchanger device 20 is attached to the side frame 12 via a bracket 22 with a gap (separately spaced) therebetween, in an orientation in which the heat exchanger device 20 extends to the right (outside) of the right side frame 12, and is disposed between the front wheel 18 and the rear wheel 19. The heat exchanger unit 30 in the heat exchange device 20 is fixed to the case body 20A via a bracket 25. That is, the heat exchanger unit 30 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 (heat exchange device 20).

[0020] Here, a specific example of the heat exchanger 31 included in the heat exchanger unit 30 will be described. The heat exchanger 31 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 31 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 31 is a radiator for cooling the battery 13 and the motor 16. As is well known, the radiator 31 is a device that exchanges heat between the battery 13 and the motor 16 via a fluid (refrigerant), and cools the refrigerant by circulating the fluid (refrigerant) inside and exchanging heat with the outside air. The refrigerant may be cooling water, cooling oil, or the like.

[0021] The radiator 31 is connected to flow paths 23A and 23B for circulating the refrigerant between the radiator 31 and the battery 13 and between the radiator 31 and the motor 16. In FIG. 3, for example, a radiator 31 housed in the heat exchange device 20 is connected to each of the flow paths 23A and 23B.

[0022] Each of the flow paths 23A and 23B is formed by a pipe for circulating a refrigerant. The flow path 23A is a circuit for circulating the refrigerant between the radiator 31 and the battery 13, and the flow path 23B is a circuit for circulating the refrigerant between the radiator 31 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.

[0023] The radiator 31 of this embodiment is provided in a position parallel to the side frame 12. That is, the radiator 31 is accommodated in the internal space 20S of the heat exchange device 20 in a position in which the normal to the surface 31A (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 31A is substantially parallel to the front-rear direction D1. A fan 32 is arranged in parallel with the radiator 31 with a gap therebetween on the inner side in the vehicle width direction D2 (on the left side in FIG. 3).

[0024] The fan 32 is an axial flow fan and serves as a blower (radiator fan) for actively sending air to the radiator 31. Specifically, the fan 32 is disposed on the inner side of the surface 31A of the radiator 31 in the vehicle width direction D2, with its rotation axis aligned with the vehicle width direction D2. The air blowing direction of the fan 32 can be appropriately changed according to the setting of the rotation direction of the fan 32. The air blowing direction of the fan 32 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 the fan 32 are controlled by a control device (not shown) so as to obtain the required airflow volume and airflow direction depending on the speed of the vehicle 1, the temperature of the parts to be cooled or the refrigerant, etc. The higher the rotation speed of the fan 32, the greater the airflow volume that can be obtained, improving the heat exchange performance of the radiator 31. However, on the other hand, the noise emitted by the fan 32 tends to increase.

[0025] The fan 32 is attached to the radiator 31 via a fan shroud (radiator fan shroud) 33. The fan shroud 33 is a cover member attached to the radiator 31 so as to surround the outer periphery of the fan 32. That is, the heat exchanger unit 30 is a module in which the radiator 31, the fan 32, and the fan shroud 33 are integrated together.

[0026] In a structure in which the heat exchanger unit 30 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 below the cab 11, and therefore it is thought that the noise of the fan 32 is more likely to be transmitted to the surroundings of the vehicle 1. Therefore, the fan shroud 33 of this embodiment is provided with a structure that improves soundproofing to the surroundings, as will be described later.

[0027] [2. Detailed configuration] The configuration of the fan shroud 33 will be described with reference to Figures 1 and 2. In Figure 2, the fan 32 is indicated by a broken line. 1 and 2, the fan shroud 33 includes a cylindrical portion 34 that forms a cylindrical part surrounding the outer periphery of the fan 32, and a mounting portion 35 that is connected to the cylindrical portion 34 and attached so as to cover the radiator (heat exchanger) 31, integrally covering the radiator 31 and the fan 32. The cylindrical portion 34 and the mounting portion 35 may be integrally formed from, for example, a plastic or sheet metal member. As described above, the heat exchanger unit 30 has a substantially square outline when viewed in the vehicle width direction D2, and therefore the fan shroud 33 in FIG. 1 also has a substantially square outline when viewed in the vehicle width direction D2.

[0028] The cylindrical portion 34 is a cylindrical portion that is formed around an axis that is aligned with the direction of the rotation axis of the fan 32 (here, the vehicle width direction D2) and is open at both ends. The cylindrical portion 34 covers the outer periphery of the fan 32 with a small gap left radially outward from the outer periphery of the fan 32. Note that, in the fan shroud 33 of FIG. 1, an annular ring portion 34A is provided on the tip side of the cylindrical portion 34 (here, the inner end in the vehicle width direction D2). The ring portion 34A is a cover member that is disposed opposite the central portion 32A of the fan 32 and is supported by the cylindrical portion 34 by arm portions 34B. In FIG. 1, four arm portions 34B are provided to support one ring portion 34A.

[0029] The mounting portion 35 is connected to the base end of the cylindrical portion 34 (here, the outer end in the vehicle width direction D2, or the right end in FIG. 2), and is formed so as to overlap with the radiator 31 in an area excluding the cylindrical portion 34 when viewed from the vehicle width direction D2, as shown in FIG. 1. A peripheral edge portion 35A of the mounting portion 35 is attached to the radiator 31 as shown in FIG. 2. In other words, the mounting portion 35 covers the surface 31A of the radiator 31 (the surface facing the fan 32) except for the area overlapping with the cylindrical portion 34 when viewed from the vehicle width direction D2.

[0030] The fan shroud 33, with the cylindrical portion 34 and the mounting portion 35, forms a flow path for air to circulate between the radiator 31 and the fan 32 in response to the operation of the fan 32. In Figure 2, the direction of air movement is indicated by an outline arrow F. In this specification, the side of the fan shroud 33 on which the above-mentioned flow passages are located relative to the cylindrical portion 34 and the mounting portion 35 is referred to as the "inside" of the fan shroud 33, and the opposite side is referred to as the "outside." The inside of the fan shroud 33 can also be referred to as the side on which the radiator 31 and the fan 32 are located relative to the cylindrical portion 34 and the mounting portion 35, and the outside of the fan shroud 33 can also be referred to as the side on which the radiator 31 and the fan 32 are located relative to the cylindrical portion 34 and the mounting portion 35.

[0031] A resonator 36 is provided on the outside of the fan shroud 33 (that is, on the opposite side of the cylindrical portion 34 and the mounting portion 35 from the radiator 31 and the fan 32). The resonator 36 is a noise reduction mechanism provided to reduce (insulate and / or muffle) the noise generated by the fan 32 by utilizing a resonance phenomenon, and includes a resonance chamber 37 and a neck portion 38. 1, a fan shroud 33 has a substantially square outline when viewed in the vehicle width direction D2, and two opposing corners (the upper right corner and the lower left corner in FIG. 1) of the fan shroud 33 are provided with one resonator 36. Each resonator 36 has a common configuration.

[0032] The resonance chamber 37 is a box-shaped body having a space 37A therein for resonating the sound emitted by the fan. The space 37A is closed by a wall except for the connection point of the neck portion 38. The neck portion 38 is a hollow tubular portion that connects the resonance chamber 37 and the cylindrical portion 34. One end of the neck portion 38, connected to the resonance chamber 37, forms an opening that communicates with the space 37A, and the other end, connected to the cylindrical portion 34, forms an opening that communicates with the inside of the cylindrical portion 34. That is, the resonator 36 is provided in an air flow path provided inside the cylindrical portion 34 (fan shroud 33) so as to interpose a resonance chamber 37 via a neck portion 38.

[0033] As is well known, resonator 36 can be designed to exhibit noise reduction performance for a specific frequency band (resonance frequency) by varying its structure. Specifically, in resonator 36, the resonance frequency can be set using the following formula 1 based on the cross-sectional area of ​​neck 38, the diameter (inner diameter) of neck 38, the length (dimension along the axial direction) of neck 38, and the volume of resonance chamber 37 (volume of space 37A). Resonator 36 exhibits noise reduction performance for the resonance frequency (specific frequency band) set in this way.

number

[0034] The specific structures of the resonance chamber 37 and the neck portion 38, such as the size, shape, arrangement, and number, are appropriately set so as to obtain a desired resonance frequency based on the above formula 1. The resonance chamber 37 of the resonator 36 is interposed in an air flow path provided inside the cylindrical portion 34 via the neck portion 38, so that the air flowing through the cylindrical portion 34 resonates with the air in the resonance chamber 37. In other words, the resonator 36 is configured to absorb (muffle) the noise of the fan 32 by causing the air flowing inside the cylindrical portion 34 to resonate with the air in the resonance chamber 37 at a certain resonance frequency. In this embodiment, the resonator 36 has been described as having a structure in which the resonance chamber 37 and the neck portion 38 are provided separately from the fan shroud 33, but the resonator 36 may also have a structure in which the resonance chamber 37 and the neck portion 38 are provided integrally with the fan shroud 33.

[0035] [3. Actions and Effects] According to the fan shroud 33 of the above embodiment, the resonator 36 is provided in the fan shroud 33 that surrounds the outer periphery of the fan 32, and therefore the noise generated by the fan 32 can be blocked by the resonator 36. The resonator 36 can be designed to exhibit sound-blocking performance for a specific frequency band (resonant frequency), and therefore can block a specific frequency band of the sound generated by the fan 32.

[0036] 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, making it difficult to suppress noise. In this regard, the heat exchanger unit 30 having the fan shroud 33 of the present invention can block noise and muffle specific frequency bands using the resonator 36 of the fan shroud 33, so even if the heat exchanger unit is located in a location other than under the cab where there are fewer obstructions, noise generated by the fan 32 is less likely to leak to the surrounding area. Therefore, soundproofing against the surroundings can be improved regardless of the placement location of the heat exchanger unit 30, and since the noise of the fan 32 is less likely to leak to the surroundings, there is no need to suppress the operation of the fan 32 in consideration of the noise of the fan 32, making it easier to ensure the heat exchange performance of the heat exchanger 31.

[0037] [4. Other] The above-described configuration of the heat exchanger 20 is an example. For example, the fan shroud may be for a dual fan system in which two fans are arranged side by side. Figures 4(A) and 4(B) are explanatory diagrams of modified examples of a fan shroud for a dual fan system. The heat exchanger unit 300 shown in Figures 4(A) and 4(B) is provided with a large radiator 310 extending along the longitudinal direction D1 of the vehicle 1, and two fans 320A and 320B are arranged side by side in the longitudinal direction D1 relative to the radiator 310. In this case, the fan shroud 330 has cylindrical portions 340A and 340B that cover the outer peripheries of the two fans 320A and 320B, respectively, and mounting portions 350 that are connected to the cylindrical portions 340A and 340B and attached to the radiator 310. The heat exchanger unit 300 shown in Figures 4(A) and (B) has been described as having a dual fan structure in which two fans 320A, 320B are arranged side by side horizontally (in the front-to-back direction D1), but it may also have a dual fan structure in which the two fans 320A, 320B are arranged side by side offset in the up-down direction D3.

[0038] 4(A) is mounted on a fan shroud 330. The fan shroud 330 is configured to muffle high-frequency noise. The resonator 360 includes two resonance chambers 370, separated vertically between two cylindrical portions 340A and 340B, and four necks 380A-380D that connect each resonance chamber 370 to the cylindrical portions 340A and 340B, respectively. Specifically, the resonator 360 includes a neck 380A that connects the upper resonance chamber 370 to the cylindrical portion 340A, a neck 380B that connects the upper resonance chamber 370 to the cylindrical portion 340B, a neck 380C that connects the lower resonance chamber 370 to the cylindrical portion 340A, and a neck 380D that connects the lower resonance chamber 370 to the cylindrical portion 340B.

[0039] A resonator 361 configured to muffle low-frequency sounds is mounted on the fan shroud 330 shown in Fig. 4(B). This resonator 361 is provided with one large resonance chamber 371 between two cylindrical portions 340A and 340B, and two neck portions 381A and 381B that respectively connect the resonance chamber 371 to the cylindrical portions 340A and 340B. This resonance chamber 371 can be said to have a shape that connects the two resonance chambers 370 shown in Fig. 4(A). 4(B) has a structure in which the volume of resonance chamber 371 is larger than that of resonance chamber 370 of resonator 360, but the number of necks 381A, 381B is smaller than that of necks 380A to 380D of resonator 360. Due to this difference in structure, the capacities of resonators 360, 361 in FIGS. 4(A) and 4(B) are changed to make the frequency bands that can be silenced different.

[0040] Furthermore, a single vehicle 1 may be equipped with a plurality of heat exchange devices 20. 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. The location where the heat exchange devices 20 are installed is not limited to the outer side of the side frame 12 in the vehicle width direction. The heat exchanger unit 30 does not have to be housed in the heat exchange device 20. Furthermore, the heat exchanger 31 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 vehicle 1 is not limited to an electric vehicle that generates little running noise, but may also be an engine vehicle that has an engine as a drive source. In this case, the engine is an example of a part to be cooled. [Explanation of symbols]

[0041] 1 vehicle 11 Cab 12 Side frame 13 Battery 14 DC / DC converter 16 motors 17 Gearbox 18 front wheels 19 rear wheel 20 Heat exchange equipment 20A case body 20S interior space 22 Bracket 23A Flow path 23B Flow path 24A pump 24B Pump 25 Bracket 30 Heat Exchanger Unit 31 Radiator (heat exchanger) 31A side 32 fans 32B Central part 33 Fan shroud 34 Cylindrical part 34A Ring section 34B Arm 35 Mounting part 35A Periphery 36 Resonator 37 Resonance chamber 37A Space 38 Neck 300 Heat Exchanger Unit 310 Radiator 320A, 320B Fan 330 Fan Shroud 340A, 340B cylindrical part 350 Mounting part 360,361 Resonator 370,371 Resonance chamber 371 Resonance chamber 380A~380D,381A,381B Neck

Claims

[Claim 1] A fan shroud that is attached to a heat exchanger that exchanges heat with components mounted on a vehicle and surrounds an outer periphery of a fan that blows air to the heat exchanger, a cylindrical portion that forms a cylindrical portion surrounding the outer periphery of the fan; a mounting portion connected to the cylindrical portion and attached to cover the heat exchanger; a resonator provided on the opposite side of the cylindrical portion and the mounting portion from the fan and the heat exchanger, the resonator having a resonance chamber having a space therein for resonating the sound generated by the fan, and a hollow tubular neck portion communicating between the resonance chamber and the cylindrical portion. A fan shroud characterized by:

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