Duct structure of vehicle

Abstract

To provide a duct of a vehicle which is capable of maintaining adequate sound absorption performance while pooling liquid.SOLUTION: A duct structure 5 of a vehicle comprises a duct 10 which is disposed on upstream side of a cooling fan 40 blowing toward a power storage stuck and includes an intake port which opens toward a passenger compartment and a sound absorption member 30 which is disposed within the duct. The duct includes a bottom wall part 120. The sound absorption member is disposed so that a clearance is provided between internal surface 120a of the bottom wall part and itself. The internal surface of the bottom wall part contains a flow path formation part 121 which forms a flow passage part 15 in which fluid L makes it possible to flow and a storage part formation part 122 which forms a storage part 16 which pools the liquid flowing the flow passage part in a portion facing the clearance. Distance between the storage part formation part and the sound absorption member is larger than distance between the flow path formation part and the sound absorption member and is provided with a step 123 between the storage part formation part and the flow path formation part.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present disclosure relates to a duct structure for a vehicle. [Background technology]

[0002] As a conventional vehicle duct structure, JP 2016-117450 A (Patent Document 1) discloses a structure in which a sound absorbing member is arranged inside an intake duct so that a back space is formed between the inner wall of the intake duct and the sound absorbing member. The back space can store liquid that has passed through the sound absorbing member. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2016-117450 A Summary of the Invention [Problem to be solved by the invention]

[0004] The frequency at which sound-absorbing materials can easily absorb sound varies depending on the thickness of the air layer located in the back space. For this reason, in a configuration in which liquid is stored in the back space as in Patent Document 1, the sound-absorbing performance changes depending on the amount of liquid stored in the back space. This raises concerns that it may be difficult to achieve both liquid storage and appropriate sound-absorbing performance.

[0005] The present disclosure has been made in consideration of the above-mentioned problems, and an object of the present disclosure is to provide a duct for a vehicle that can store liquid while maintaining appropriate sound absorption performance. [Means for solving the problem]

[0006] A duct structure for a vehicle according to the present disclosure includes a duct arranged upstream of a cooling fan that blows air toward an electric storage stack, the duct having an air intake opening toward a vehicle interior, and a sound absorbing member arranged within the duct. The duct has a bottom wall portion. The sound absorbing member is arranged such that a gap is provided between the sound absorbing member and an inner surface of the bottom wall portion. The inner surface of the bottom wall portion includes, in a portion facing the gap, a flow path forming portion that forms a flow path portion through which liquid can flow, and a storage portion forming portion that forms a storage portion that stores the liquid that has flowed through the flow path portion. The distance between the storage portion forming portion and the sound absorbing member is greater than the distance between the flow path forming portion and the sound absorbing member. A step is provided between the storage portion forming portion and the flow path forming portion.

[0007] According to the above configuration, the liquid can be stored in the storage section. Furthermore, by providing a step between the flow passage forming section and the storage section forming section, the liquid that flows through the flow section and is stored in the storage section can be prevented from flowing back into the flow passage section, and the liquid can be prevented from accumulating in the flow passage section. This makes it possible to keep the thickness of the air layer located in the gap between the flow passage forming section and the sound absorbing member constant, and to maintain appropriate sound absorbing performance.

[0008] In the vehicle duct structure based on the present disclosure, a downstream opening of the duct that is located downstream of the storage portion and opens toward the cooling fan may be located at a higher position than the storage portion.

[0009] According to the above configuration, the downstream end of the duct is located higher than the storage portion, so that the liquid stored in the storage portion can be prevented from entering the cooling fan.

[0010] In the duct structure for a vehicle based on the present disclosure, the duct may include a first portion extending along a first direction and a second portion located downstream of the first portion and extending along a second direction intersecting the first direction. The flow path forming portion and the reservoir forming portion may be provided in the second portion. The first portion may be provided with the intake port and an opening portion communicating with the second portion. The second portion may have a side wall portion connecting the flow path forming portion and the opening portion. The side wall portion may be provided with a guide portion that guides the liquid flowing through the first portion to the flow path forming portion.

[0011] According to the above configuration, the liquid can be guided to the flow path portion by the guide portion, so that adhesion of the liquid to the sound absorbing member can be suppressed. Effect of the Invention

[0012] According to the present disclosure, it is possible to provide a duct for a vehicle that can store liquid while maintaining appropriate sound absorbing performance. [Brief description of the drawings]

[0013] [Figure 1] 1 is a schematic diagram showing a vehicle according to an embodiment. [Diagram 2] 2 is a diagram showing a duct structure and an electricity storage device of a vehicle according to an embodiment; [Diagram 3] FIG. 3 is a schematic cross-sectional view taken along line III-III shown in FIG. [Figure 4] FIG. 3 is a schematic perspective view showing the inside of the duct structure shown in FIG. 2. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. In the embodiments described below, the same or common parts are denoted by the same reference numerals in the drawings, and the description thereof will not be repeated. In each drawing, the X-axis direction indicates the vehicle width direction, the Y-axis direction indicates the vehicle front-rear direction, and the Z-axis direction indicates the vehicle height direction.

[0015] Fig. 1 is a schematic diagram showing a vehicle according to an embodiment of the present invention. A vehicle 100 according to an embodiment of the present invention will be described with reference to Fig. 1.

[0016] Vehicle 100 is, for example, a hybrid vehicle capable of running using at least one of the power of a motor and an engine, or an electric vehicle that runs using driving force obtained from electric energy.

[0017] Vehicle 100 includes an electricity storage device 1, a rear seat 60, and a floor panel 70. Electricity storage device 1 is disposed, for example, below rear seat 60. More specifically, electricity storage device 1 is disposed between a seat cushion of rear seat 60 and floor panel 70. Note that the position of electricity storage device 1 is not limited to the above, and it can be disposed as appropriate as long as it can be cooled using the air in the vehicle cabin.

[0018] Fig. 2 is a diagram showing a duct structure and a power storage device of a vehicle according to an embodiment. Fig. 3 is a schematic cross-sectional view taken along line III-III shown in Fig. 2. Fig. 4 is a schematic perspective view showing the inside of the duct structure shown in Fig. 2. For convenience, sound absorbing member 30 is omitted in Fig. 4. Details of duct structure 5 and power storage device 1 will be described with reference to Figs. 2 to 4.

[0019] As shown in Fig. 2, the power storage device 1 has a longitudinal shape in the vehicle width direction. The power storage device 1 includes a housing case 2 and a power storage stack 3. The power storage stack 3 is housed in the housing case 2. The power storage stack 3 is configured by arranging a plurality of power storage cells 4 side by side. The plurality of power storage cells 4 are arranged side by side, for example, along the vehicle width direction.

[0020] The storage cell 4 is, for example, a secondary battery such as a nickel-metal hydride battery or a lithium-ion battery. The storage cell 4 has, for example, a rectangular shape. The storage cell 4 may use a liquid electrolyte or a solid electrolyte. The storage cell 4 may also be a unit capacitor configured to be capable of storing electricity.

[0021] As shown in FIGS. 2 to 4, the duct structure 5 includes a first duct 10, a second duct 20, and a sound absorbing member 30.

[0022] The second duct 20 is disposed downstream of the first duct 10. The second duct 20 connects the first duct 10 and the electricity storage device 1. A cooling fan 40 is disposed inside the second duct 20. The cooling fan 40 blows cooling air toward the electricity storage stack 3. As the cooling fan 40, for example, a sirocco fan or a propeller fan can be adopted.

[0023] The first duct 10 is disposed upstream of the cooling fan 40, and guides air drawn in from the vehicle compartment to the cooling fan 40. The first duct 10 has an air intake port 10a that opens toward the vehicle compartment, and a downstream opening 10b that opens toward the cooling fan 40.

[0024] The first duct 10 includes a first portion 11 and a second portion 12. The first portion 11 extends along a first direction. The first direction is, for example, a direction substantially parallel to the front-rear direction of the vehicle. The first portion 11 is provided with an intake port 10a and an opening 10c communicating with the second portion 12.

[0025] The second portion 12 extends along a second direction intersecting the first direction. The second direction is, for example, a direction substantially parallel to the vehicle width direction. The second portion 12 connects the first portion 11 and the second duct 20. A sound absorbing member 30 is disposed inside the second portion 12. The second portion 12 is provided with the above-mentioned downstream opening 10b.

[0026] The second portion 12 has a bottom wall portion 120 and a side wall portion 130. The bottom wall portion 120 faces the sound absorbing member 30. The bottom wall portion 120 is located below the sound absorbing member 30. A gap is formed between the bottom wall portion 120 and the sound absorbing member 30.

[0027] The bottom wall portion 120 has an inner surface 120a. The inner surface 120a includes, in a portion facing the gap, a flow path forming portion 121 and a reservoir portion forming portion 122. The flow path forming portion 121 forms a flow path portion 15 through which liquid can flow.

[0028] The reservoir forming portion 122 forms the reservoir 16 that retains the liquid that has flowed through the flow path portion 15. The downstream opening 10b is located at a higher position than the reservoir 16.

[0029] The reservoir forming portion 122 is disposed downstream of the flow path forming portion 121, and is located at a position lower in height than the flow path forming portion 121. A step 123 is provided between the reservoir forming portion 122 and the flow path forming portion 121.

[0030] The side wall 130 is provided to stand upward from an end of the flow path forming portion 121 located on the first portion 11 side. The side wall 130 connects the flow path forming portion 121 and the opening 10c. The side wall 130 is provided with a guide portion 131 that guides the liquid flowing through the first portion 11 to the flow path forming portion 121. The guide portion 131 is configured, for example, by a recess that is recessed toward the intake port 10a side. A gap is formed between the recess and the sound absorbing member 30, so that the liquid flowing through the first portion 11 can be guided to the flow path forming portion 121 through the gap.

[0031] The sound absorbing member 30 is made of any material that has sound absorbing properties. For example, the sound absorbing member 30 may be made of inorganic fibers such as glass wool or rock wool, metal fiber materials such as aluminum fibers, synthetic resin foams such as polystyrene resins or polyethylene resins, soft materials such as urethane or rubber, porous materials, etc. The sound absorbing member 30 may also be made of a composite or laminate of various appropriate materials including the above-mentioned materials.

[0032] As described above, the sound absorbing member 30 is disposed so as to provide a gap between it and the inner surface 120a of the bottom wall portion 120. Specifically, for example, the sound absorbing member 30 is disposed so as to be substantially parallel to the flow path forming portion 121 above the flow path forming portion 121. The sound absorbing member 30 is disposed so as to be inclined upward toward the downstream side above the storage portion forming portion 122. The distance between the storage portion forming portion 122 and the sound absorbing member 30 is greater than the distance between the flow path forming portion 121 and the sound absorbing member 30.

[0033] 3, when liquid L enters air intake port 10a from the vehicle interior or when condensation occurs inside duct 10, liquid L passes through first portion 11 and is guided onto flow path forming portion 121. Liquid L guided onto flow path forming portion 121 passes through flow path portion 15 formed in the gap between flow path forming portion 121 and sound absorbing member 30, is introduced onto reservoir forming portion 122, and is stored in reservoir 16.

[0034] As described above, step 123 is provided between flow path forming section 121 and reservoir forming section 122. This makes it possible to prevent liquid L from flowing back from reservoir 16 to flow path section 15, and to prevent liquid from accumulating in flow path section 15. This makes it possible to keep the thickness of the air layer located in the gap between flow path forming section 121 and sound absorbing member 30 constant, and to maintain appropriate sound absorbing performance.

[0035] Furthermore, since the downstream opening 10b of the first duct 10 is located higher than the reservoir 16, the liquid L stored in the reservoir 16 can be prevented from entering the cooling fan 40.

[0036] In addition, by guiding the movement of the liquid L from the first portion 11 to the flow path portion 15 using the guide portion 131, adhesion of the liquid L to the sound absorbing member 30 can be suppressed.

[0037] The embodiments disclosed herein are illustrative and not restrictive in all respects. The scope of the present invention is defined by the claims, and includes all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0038] 1 Energy storage device, 2 Storage case, 3 Energy storage stack, 4 Energy storage cell, 5 Duct structure, 10 First duct, 10a Intake port, 10b Downstream opening, 10c Opening, 11 First portion, 12 Second portion, 15 Flow path portion, 16 Storage portion, 20 Second duct, 30 Sound absorbing member, 40 Cooling fan, 60 Rear seat, 70 Floor panel, 100 Vehicle, 120 Bottom wall portion, 120a Inner surface, 121 Flow path forming portion, 122 Storage portion forming portion, 123 Step, 130 Side wall portion, 131 Guide portion.

Claims

1. a duct that is disposed upstream of a cooling fan that blows air toward the power storage stack and has an air intake port that opens toward a vehicle interior; a sound absorbing member disposed within the duct, The duct has a bottom wall. The sound absorbing member is disposed so as to provide a gap between the sound absorbing member and an inner surface of the bottom wall portion, the inner surface of the bottom wall portion includes, in a portion facing the gap, a flow path forming portion that forms a flow path portion through which a liquid can flow, and a reservoir forming portion that forms a reservoir portion that reserves the liquid that has flowed through the flow path portion; a distance between the storage portion forming portion and the sound absorbing member is greater than a distance between the flow path forming portion and the sound absorbing member, A duct structure for a vehicle, wherein a step is provided between the storage portion forming portion and the flow path forming portion.

2. The duct structure for a vehicle according to claim 1 , wherein a downstream opening of the duct, which is provided downstream of the storage portion and opens toward the cooling fan, is located at a higher position than the storage portion.

3. the duct includes a first portion extending along a first direction and a second portion located downstream of the first portion and extending along a second direction intersecting the first direction, the flow path forming portion and the storage portion forming portion are provided in the second portion, The first portion is provided with an opening communicating with the intake port and the second portion, the second portion has a side wall portion connecting the flow path forming portion and the opening portion, The duct structure for a vehicle according to claim 1 , wherein the side wall portion is provided with a guide portion that guides the liquid flowing in the first portion to the flow passage forming portion.

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