Intake system for vehicle engine

Abstract

To provide an intake device for a vehicle engine which can propagate an intake sound to a cabin which can give a driver satisfaction in driving of the vehicle, while suppressing a rise of manufacturing costs of the vehicle and keeping an occupation space in an engine room small.SOLUTION: An intake device 5 for introducing fresh air to an engine is installed in an engine room. The intake device 5 comprises an intake duct 51, an air cleaner 52, an introduction duct and a non-woven fabric 541. A downstream-side portion 51e of the intake duct 51 has an opening part 51c which is opened toward the engine room. The non-woven fabric 541 is arranged so as to block the opening part 51c. The fiber basis weight of the non-woven fabric 541 is set to 130 g / m2 to 400 g / m2 so that a sound pressure level of an intake sound propagated to a cabin from the intake duct 51 via the engine room falls within a range of 78 dB to 82 dB.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to an intake system for a vehicle engine. [Background technology]

[0002] Some vehicles are equipped with an intake noise amplification device in an intake system that guides fresh air into the engine, which is installed in the engine compartment and intentionally increases the intake noise of the engine so that it propagates inside the vehicle cabin. In vehicles equipped with such an intake noise amplification device in an intake system, the driver can sense a sense of auditory satisfaction in driving the vehicle due to the sound effect (intake noise) that occurs in response to accelerator operation.

[0003] Patent Document 1 discloses a vehicle in which an intake noise amplification device having a resonance pipe and a vibrating membrane is attached to the intake system. In the intake noise amplification device of Patent Document 1, one end of the resonance pipe is connected to an air cleaner hose that connects the air cleaner and the engine, and a vibrating membrane is connected to the other end of the resonance pipe. In an intake noise amplification device of this structure, the vibrating membrane, which is attached to close the other end of the resonance pipe, vibrates in resonance with air column resonance at a specific frequency generated inside the resonance pipe, thereby propagating amplified intake noise into the vehicle cabin. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 4476130 Summary of the Invention [Problem to be solved by the invention]

[0005] However, the intake noise amplification device disclosed in Patent Document 1 requires the addition of a resonator pipe and a vibrating membrane to the intake system, which increases the vehicle manufacturing costs. Furthermore, the intake noise amplification device disclosed in Patent Document 1 also has the problem of taking up a large amount of space in the engine room because the length and diameter of the resonator pipe are determined by the resonant frequency of the intake noise.

[0006] The present invention has been made to solve the above-mentioned problems, and aims to provide an intake device for a vehicle engine that can transmit an intake sound into the passenger compartment, which can give the driver a sense of satisfaction in operating the vehicle, while suppressing an increase in vehicle manufacturing costs and minimizing the space occupied in the engine compartment. [Means for solving the problem]

[0007] First, the inventors conducted extensive research into the sound pressure level of intake noise propagating into the vehicle cabin. As a result, they discovered that if the sound pressure level of the intake noise propagating into the vehicle cabin is within the range of 78 dB to 82 dB, the driver can perceive the propagated intake noise as a sporty sound. That is, they concluded that by propagating the intake noise into the vehicle cabin while controlling the sound pressure level within the range of 78 dB to 82 dB, the driver can auditorily perceive the satisfaction of driving the vehicle and is less likely to experience discomfort from the intake noise. The inventors then came up with the idea of ​​providing an opening in the intake duct separate from the intake port and providing a porous member to control the sound pressure level of the intake noise output from the opening in order to output the intake noise at a sound pressure level within the above range.

[0008] Therefore, one aspect of the present invention provides an intake device for a vehicle engine for introducing fresh air into an engine mounted in an engine compartment of a vehicle, and includes an intake duct, an air cleaner, an introduction duct, and a porous member. The intake duct opens outward from the engine compartment and has an intake port for introducing fresh air and an opening separate from the intake port that opens toward the engine compartment. The air cleaner is connected to the intake duct and filters the fresh air that has passed through the intake duct. The introduction duct is connected to the air cleaner and introduces the fresh air filtered by the air cleaner into the engine. The porous member is a sheet-like or plate-like member arranged to close the opening of the intake duct.

[0009] A radiator is housed in the front part of the engine compartment, and the opening of the intake duct is located rearward of the radiator and in the vicinity of the radiator, opening forward so as to face the radiator. Here, in the intake device for a vehicle engine according to this embodiment, the porous member is arranged so that the sound pressure level of the intake sound propagating from the intake duct through the engine compartment to the vehicle cabin is in the range of 78 dB to 82 dB.

[0010] In the intake device for a vehicle engine according to the above embodiment, an opening is provided in the intake duct separate from the intake port, and a sheet-like or plate-like porous member is arranged to cover the opening. The porous member transmits intake sound into the vehicle cabin at a sound pressure level in the range of 78 dB to 82 dB, making it superior in terms of manufacturing costs and space occupied to the structure of Patent Document 1, which employs an intake sound amplification device having a resonator pipe and a vibrating membrane.

[0011] Furthermore, in the intake device for a vehicle engine according to the above embodiment, the sound pressure level of the intake noise propagated into the passenger compartment by the porous member is controlled to within a range of 78 dB to 82 dB, so that the driver can feel a sense of satisfaction from operating the vehicle from an auditory perspective and is less likely to experience discomfort due to the intake noise.

[0012] In the intake system for a vehicle engine according to the above aspect, the porous member is formed using a fiber material, and the fiber basis weight of at least the portion that closes the opening is 130 g / m 2 ~400g / m 2 It may be set in the range of

[0013] In the intake device for a vehicle engine according to the above aspect, a porous member made of a fibrous material is used, and the fiber basis weight is 130 g / m 2 ~400g / m 2 Since the sound pressure level of the intake noise propagating into the vehicle interior can be kept within the range of 78 dB to 82 dB.

[0014] In addition, in the intake device for a vehicle engine according to the above aspect, the fiber basis weight is 130 g / m 2 As a result, the air in the engine compartment that has been warmed by the engine running is prevented from being drawn into the intake duct through the opening, and therefore the intake device for a vehicle engine according to the above aspect can prevent a decrease in engine output that would occur if hot air in the engine compartment were drawn into the intake duct.

[0015] In the intake device for a vehicle engine according to the above aspect, the porous member may be formed using a nonwoven fabric.

[0016] In the vehicle engine intake device according to the above aspect, the porous member made of nonwoven fabric is used, so that the porous member can be reliably arranged to fit the duct wall even if the portion where the opening is provided has a complex shape. Furthermore, by using the porous member made of nonwoven fabric, increases in manufacturing costs can be suppressed.

[0017] In the intake system for a vehicle engine according to the above aspect, the engine compartment includes: The aforementionedA radiator shroud is arranged around the outer periphery of the radiator, and the intake port may be located on the radiator shroud, at a position forward of the rear end of the radiator in the fore-and-aft direction of the vehicle.

[0018] In the vehicle engine intake device according to the above aspect, the intake port of the intake duct is located above the radiator shroud and further forward of the rear end of the radiator, so that fresh, low-temperature fresh air can be taken into the intake device from outside the engine compartment, which is advantageous in preventing a decrease in engine output.

[0019] In the intake device of a vehicle engine relating to the above-mentioned aspect, the intake duct may have an upstream portion extending from the intake port toward the rear side in the fore-and-aft direction of the vehicle, and a downstream portion that is downstream of the upstream portion in the flow direction of the fresh air and extends in a direction intersecting the fore-and-aft direction of the vehicle, and the opening may be provided in the duct wall of the downstream portion.

[0020] In the intake device for a vehicle engine according to the above aspect, the opening is provided not in the upstream portion extending from the intake port in the fore-and-aft direction of the vehicle, but in the downstream portion that is bent and connected to the upstream portion, which is therefore even more advantageous in controlling the sound pressure level of the intake sound output from the opening to within the range of 78 dB to 82 dB. In the intake device for a vehicle engine according to the above aspect, the opening of the intake duct may be arranged outward from the engine in the vehicle width direction. In the intake device for a vehicle engine according to the above aspect, the opening of the intake duct may be arranged so that the inner space of the intake duct is open to the engine compartment through the porous member. [Effects of the Invention]

[0021] The intake device for a vehicle engine according to each of the above aspects is capable of transmitting an intake sound into the passenger compartment that gives the driver a sense of satisfaction in operating the vehicle, while suppressing increases in vehicle manufacturing costs and minimizing the space occupied in the engine compartment. [Brief explanation of the drawings]

[0022] [Figure 1] 1 is a perspective view showing an engine room of a vehicle equipped with an intake device according to an embodiment of the present invention. [Figure 2] FIG. 2 is a perspective view showing the configuration of the intake device. [Figure 3] 10 is an exploded front view showing an opening provided in the intake duct and a sound pressure control member including a nonwoven fabric attached to the opening. FIG. [Figure 4] FIG. 4 is a cross-sectional view showing the arrangement of air intake ports in an air intake duct. [Figure 5] 1 is a graph showing the relationship between the fiber basis weight of a nonwoven fabric and sound pressure level. [Figure 6] 10 is a graph showing the relationship between the opening area of ​​the opening in the intake duct and the sound pressure level. DETAILED DESCRIPTION OF THE INVENTION

[0023] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Note that the embodiment described below is an example of the present invention, and the present invention is not limited to the following embodiment except for its essential configuration.

[0024] In the drawings used in the following description, "FR" indicates the front of the vehicle, "RE" indicates the rear of the vehicle, "LE" indicates the left side of the vehicle, "RI" indicates the right side of the vehicle, "UP" indicates the top of the vehicle, and "LO" indicates the bottom of the vehicle.

[0025] 1. Engine Room 1a Configuration The configuration of an engine room 1a to which an intake device 5 for an engine 4 according to this embodiment is applied will be described with reference to FIG.

[0026] As shown in Fig. 1, a vehicle 1 according to this embodiment has an engine compartment 1a at the front of the vehicle. In front of the engine compartment 1a are a front grille 3, which serves as a passageway for taking in fresh air from the front of the engine compartment 1a, and a bumper 2, which is disposed so as to surround the periphery of the front grille 3. Behind the engine compartment 1a is a passenger compartment where passengers sit with a dash panel between them. Note that the dash panel and passenger compartment are not shown in Fig. 1.

[0027] The engine room 1a is equipped with an engine 4 and an intake device 5 that introduces fresh air to the engine 4. In this embodiment, the intake device 5 is disposed on the left side of the engine 4, for example.

[0028] 2. Configuration of the intake device 5 The configuration of the intake device 5 will be described with reference to FIG.

[0029] As shown in FIG. 2, the intake device 5 according to this embodiment includes an intake duct 51, an air cleaner 52, an introduction duct 53, and a sound pressure control member 54. The intake duct 51 has an intake port 51a at one end that takes in fresh air from the front of the vehicle, and the other end connected to the air cleaner 52. The intake duct 51 has an upstream portion 51d and a downstream portion 51e that are continuous with each other. The upstream portion 51d includes a portion where the intake port 51a is provided, and is disposed so as to extend in the fore-and-aft direction of the vehicle. The downstream portion 51e is connected downstream of the upstream portion 51d in the flow direction of the fresh air. The downstream portion 51e is formed so as to extend diagonally downward and leftward from the portion where it is connected to the upstream portion 51d.

[0030] The air cleaner 52 has a mechanism therein for filtering the fresh air introduced through the intake duct 51. The fresh air filtered by the air cleaner 52 is sent to the engine 4 via the intake duct 53.

[0031] Sound pressure control member 54 is a member including a nonwoven fabric, which is a porous member, and is attached to duct wall 51b of downstream portion 51e of intake duct 51. In intake device 5 according to this embodiment, sound pressure control member 54 is attached to duct wall 51b facing the front side of the vehicle in downstream portion 51e. However, the attachment position of sound pressure control member 54 relative to intake duct 51 is not limited to this.

[0032] 3. Structure of the sound pressure control member 54 The configuration of the sound pressure control member 54 in the intake device 5 will be described with reference to Fig. 3. Fig. 3 is a front view of a part of the intake device 5 seen from the front side of the vehicle.

[0033] As shown in FIG. 3, an opening 51c is provided in the duct wall 51b of the downstream portion 51e of the intake duct 51, the opening 51c being open toward the engine compartment 1a. In the intake device 5 according to this embodiment, as an example, the opening 51c is provided so as to open toward the front of the vehicle. The opening area of ​​the opening 51c is 2000 mm 2 ~5000mm 2 The reason for this will be explained later.

[0034] Sound pressure control member 54 has nonwoven fabric (a sheet-like porous member) 541 arranged so as to close opening 51c of intake duct 51, and pressing member 542 which is a lattice-shaped frame-like member. Nonwoven fabric 541 is formed to have a surface size larger than opening 51c of intake duct 51, and its outer edge abuts against the edge of opening 51c.

[0035] In the intake device 5 according to this embodiment, the fiber basis weight of the nonwoven fabric 541 is 130 g / m 2 ~400g / m 2 This range of fiber basis weight is set so that the sound pressure level of the intake sound propagating from the opening 51c of the intake duct 51 through the engine room 1a to the passenger compartment is in the range of 78 dB to 82 dB. This will be described later.

[0036] The pressing member 542 is a lattice-shaped frame-like member, and is a member for fixing the nonwoven fabric 541 by sandwiching the nonwoven fabric 541 between the pressing member 542 and the edge of the opening 51c.

[0037] 4. Arrangement of the intake port 51a in the intake duct 51 The arrangement of the intake ports 51a in the intake duct 51 will be described with reference to FIG.

[0038] As shown in Fig. 4, a radiator 7 and a radiator shroud 8 are housed in the front part of the engine compartment 1a. A hood 6 is disposed above the engine compartment 1a so as to be able to open and close.

[0039] The radiator shroud 8 is disposed around the outer periphery of the radiator 7 and is a member that prevents hot air discharged rearward from the radiator 7 from being sucked back in from the front of the radiator 7. Spaces are provided between the radiator shroud 8 and the bumper 2 and between the radiator shroud 8 and the bonnet 6. Some of the fresh air that passes through the front grille 3 and is taken into the engine compartment 1a also flows into the spaces between the radiator shroud 8 and the bumper 2 and between the radiator shroud 8 and the bonnet 6.

[0040] The intake device 5 according to this embodiment is disposed immediately behind the radiator 7. The intake port 51a of the intake duct 51 is disposed on the radiator shroud 8. Therefore, the intake port 51a of the intake duct 51 is disposed on the vehicle front side of the rear end of the radiator 7, i.e., the portion where hot air is discharged from the radiator 7.

[0041] In the intake device 5 according to this embodiment, the intake port 51a of the intake duct 51 is located on the radiator shroud 8 and further forward in the vehicle than the rear end of the radiator 7, which makes it possible to prevent the intake of hot air discharged toward the rear of the vehicle from the radiator 7. In addition, since the intake port 51a is arranged to face the front of the vehicle, fresh air that has passed through the front grille 3 and been taken into the engine compartment 1a is introduced into the intake device 5 through the intake port 51a.

[0042] 5. Fiber basis weight of nonwoven fabric 541 In the air intake device 5 according to this embodiment, the fiber basis weight of the nonwoven fabric 541 is 130 g / m 2 ~400g / m 2 The reason for this will be explained with reference to FIG.

[0043] First, the inventors of the present application conducted extensive research into the sound pressure level of intake noise propagating into the vehicle cabin and found that if the sound pressure level of the intake noise propagating into the vehicle cabin is within the range of 78 dB to 82 dB, the driver can perceive the propagated intake noise as a sporty sound. That is, they concluded that by propagating the intake noise into the vehicle cabin while controlling the sound pressure level within the range of 78 dB to 82 dB, the driver can auditorily perceive satisfaction in operating the vehicle 1 and is less likely to experience discomfort due to the intake noise. As a specific configuration for propagating the intake noise into the vehicle cabin at a sound pressure level within the range of 78 dB to 82 dB, they adopted the configuration of the intake device 5 according to this embodiment.

[0044] As shown in Fig. 5, the horizontal axis represents the fiber basis weight of nonwoven fabric 541, and the vertical axis represents the sound pressure level of intake noise propagated into the vehicle cabin. Note that the graph shown in Fig. 5 assumes that the opening area of ​​opening 51c in intake duct 51 is 2900 mm 2 This is the graph obtained as follows.

[0045] 5, the sound pressure level of the intake sound propagated into the vehicle interior gradually decreases as the fiber basis weight of the nonwoven fabric 541 increases. As shown by arrow A1, in order to keep the sound pressure level of the intake sound within the range of 78 dB to 82 dB, the fiber basis weight of the nonwoven fabric 541 is set to 130 g / m 2 ~400g / m 2 (the range indicated by the arrow A2). Therefore, in the intake device 5 according to this embodiment, the fiber basis weight of the nonwoven fabric 541 in the sound pressure control device 54 is set to 130 g / m 2 ~400g / m 2 It was decided to set it within the range.

[0046] Although detailed data is not shown, the fiber weight of the nonwoven fabric 541 is 130 g / m 2 It has been confirmed that by setting the above, it is possible to prevent the air in the engine compartment 1a, which is heated by the operation of the engine 4, from being sucked into the intake duct 51 through the opening 51c of the intake duct 51. For this reason, the fiber weight of the nonwoven fabric 541 is set to 130 g / m 2 By doing so, the sound pressure level of the intake noise into the passenger compartment can be kept below 82 dB, and the reduction in output of the engine 4 caused by drawing hot air from the engine compartment 1a into the intake duct 51 can be suppressed.

[0047] 6. Opening area of ​​opening 51c in intake duct 51 The relationship between the opening area of ​​opening 51c in intake duct 51 and the sound pressure level of intake noise propagated into the vehicle cabin will be described with reference to Fig. 6. The graph in Fig. 6 shows the relationship between the opening area of ​​opening 51c in intake duct 51 and the sound pressure level of intake noise propagated into the vehicle cabin when nonwoven fabric 541 has a fiber basis weight of 250 g / m 2 This is the graph obtained as follows.

[0048] As shown in Figure 6, the horizontal axis represents the opening area of ​​opening 51c, and the vertical axis represents the sound pressure level of the intake noise propagating into the vehicle cabin. The sound pressure level of the intake noise gradually increases as the opening area of ​​opening 51c is increased. As shown by arrow B1, in order to keep the sound pressure level of the intake noise within the range of 78 dB to 82 dB, the opening area of ​​opening 51c in intake duct 51 must be set to 2000 mm 2 ~5000mm 2 (the range indicated by the arrow B2). Therefore, in the intake device 5 according to this embodiment, the opening area of ​​the opening 51c in the intake duct 51 is set to 2000 mm 2 ~5000mm 2 It was decided to set it within the range.

[0049] 7.Effects In the intake device 5 of this embodiment, an opening 51c is provided in the intake duct 51, and a nonwoven fabric (a sheet-like porous member) 541 is arranged to cover the opening 51c, and the nonwoven fabric 541 transmits the intake sound into the vehicle cabin at a sound pressure level in the range of 78 dB to 82 dB, so that the intake device 5 is superior in terms of manufacturing costs and occupied space to the structure of Patent Document 1 above, which uses an intake sound amplification device having a resonance pipe and a vibrating membrane.

[0050] In addition, in the intake device 5, the sound pressure level of the intake noise propagated into the vehicle cabin by the nonwoven fabric 541 is controlled to within a range of 78 dB to 82 dB, so that the driver can feel a sense of satisfaction from operating the vehicle 1 from an auditory perspective and is less likely to feel uncomfortable due to the intake noise.

[0051] In addition, in the intake device 5 according to this embodiment, a nonwoven fabric 541, which is a fibrous material, is used as an example of a porous member, and the fiber basis weight of the nonwoven fabric 541 is 130 g / m 2 ~400g / m 2 Since the sound pressure level of the intake noise propagating into the vehicle interior can be kept within the range of 78 dB to 82 dB.

[0052] In the air intake device 5, the fiber basis weight of the nonwoven fabric 541 is 130 g / m 2 As a result, the air in the engine compartment 1a that has been warmed by the operation of the engine 4 is prevented from being drawn into the duct through the opening 51c provided in the intake duct 51. Therefore, the intake device 5 can prevent a decrease in the output of the engine 4 that occurs when hot air in the engine compartment 1a is drawn into the intake duct 51.

[0053] Furthermore, in intake device 5 according to this embodiment, sheet-like nonwoven fabric 541 is used as a member for closing opening 51c, so that even if the shape of the portion of duct wall 51b of intake duct 51 where opening 51c is provided is complex, it can be disposed so as to reliably fit along the shape. Furthermore, by using nonwoven fabric 541, it is possible to suppress an increase in manufacturing costs compared to when a special member (dedicated member) is used.

[0054] Furthermore, in the intake device 5 according to this embodiment, the intake port 51a of the intake duct 51 is located on the radiator shroud 8 and further forward of the rear end of the radiator 7, so that fresh, low-temperature fresh air can be taken in from outside the engine compartment 1a into the intake device 5. Therefore, the intake device 5 according to this embodiment is advantageous in suppressing a decrease in the output of the engine 4.

[0055] Furthermore, in the intake device 5 of this embodiment, the opening 51c is provided in the duct wall 51b of the downstream portion 51e that extends diagonally downward to the left from the connection point with the upstream portion 51d, rather than in the upstream portion 51d that extends from the intake port 51a toward the rear of the vehicle, which is even more advantageous in controlling the sound pressure level of the intake sound output from the opening 51c to within the range of 78dB to 82dB.

[0056] As described above, the intake device 5 of this embodiment is capable of transmitting an intake sound into the passenger compartment that gives the driver a sense of satisfaction in operating the vehicle 1, while suppressing an increase in the manufacturing cost of the vehicle 1 and keeping the space occupied within the engine compartment 1a small.

[0057] [Variations] In the above embodiment, nonwoven fabric 541 is used as an example of a porous member, but the present invention is not limited to this. For example, a fibrous member such as a woven fabric or knitted fabric may be used, or a plate-shaped foamed resin (e.g., polyurethane foam, expanded polystyrene foam, vinyl foam, etc.), or a plate-shaped foamed metal may be used. Note that when a porous member other than a fibrous material is used, the same effect as in the above embodiment can be obtained by selecting a member with a porosity that allows the sound pressure level of the intake sound propagated into the vehicle cabin to be within the range of 78 dB to 82 dB.

[0058] In the above embodiment, nonwoven fabric 541 is sandwiched between pressing members 541 to fix nonwoven fabric 541 to duct wall 51b of intake duct 51, but the present invention is not limited to this. For example, the outer edge of a porous member such as nonwoven fabric and the duct wall can be joined with an adhesive or by thermal welding. It is also possible to attach the porous member to the intake duct by two-color molding or the like.

[0059] In the above embodiment, opening 51c is provided in downstream portion 51e of intake duct 51, but the present invention also allows openings to be provided in upstream portion 51d or other locations of intake duct 51. It is also possible to provide multiple openings in the intake duct.

[0060] In the above embodiment, the opening 51c of the intake duct 51 is provided so as to open toward the front of the vehicle, but the present invention is not limited to this. For example, the opening may be provided so as to open toward the rear of the vehicle or toward the left and right in the vehicle width direction.

[0061] In the above embodiment, opening 51c is provided at a relatively high position in downstream portion 51e of intake duct 51, but in the present invention, it is also possible to provide an opening at a relatively low position in downstream portion 51e. Note that, according to what the inventors have confirmed, if an opening is provided at a low position in the downstream portion, it is possible to output intake sound at a stronger sound pressure level than if an opening is provided at a high position.

[0062] Although the above embodiment does not refer to the duct diameter of the intake duct 51, it can be set appropriately depending on the displacement of the engine 4, the volume of the engine compartment 1a, etc. The inventors of the present application have confirmed that a larger duct diameter for the intake duct can output intake noise at a stronger sound pressure level in the range of 150 Hz to 450 Hz than a smaller duct diameter.

[0063] Although the above embodiment does not refer to the capacity of the air cleaner 52, it can be set appropriately depending on the displacement of the engine 4, the volume of the engine compartment 1a, etc. The inventors of the present application have confirmed that when the capacity of the air cleaner is small, the sound pressure level of the intake sound in the ranges of 600 Hz to 900 Hz and 150 Hz to 350 Hz can be made stronger than when the capacity is large.

[0064] In the above embodiment, the intake device 5 is positioned to the left of the engine 4 in the vehicle width direction within the engine compartment 1a, but the present invention also makes it possible to position the intake device to the right of the engine in the vehicle width direction, or in front of or behind the engine 5.

[0065] In the above embodiment, a structure in which the engine compartment 1a is provided in the front part of the vehicle 1 is adopted, but the present invention is not limited to this. For example, a structure in which the engine compartment is provided in the rear part of the vehicle can also be adopted. [Explanation of symbols]

[0066] 1 vehicle 1a Engine room 4 Engine 5. Intake system 7 Radiator 8 Radiator shroud 51 Intake duct 51a Air intake 51b Duct wall 51c opening 51d upstream part 51e downstream 52 Air cleaner 53 Inlet duct 54 Sound pressure control member 541 Nonwoven fabric (porous material)

Claims

1. An intake device for a vehicle engine for introducing fresh air into an engine mounted in an engine compartment of a vehicle, an intake duct having an intake port that opens toward the outside of the engine compartment and takes in fresh air, and an opening that is provided separately from the intake port and opens toward the engine compartment; an air cleaner connected to the intake duct and filtering fresh air that has passed through the intake duct; an intake duct connected to the air cleaner for introducing fresh air filtered by the air cleaner into the engine; a porous member that is a sheet-like or plate-like member provided so as to close the opening of the intake duct; Equipped with A radiator is housed in the front of the engine compartment, the opening of the intake duct is located rearward of the radiator and in the vicinity of the radiator, and opens forward so as to face the radiator, The porous member is provided so that the sound pressure level of intake noise propagating from the intake duct through the engine compartment to the vehicle cabin is in the range of 78 dB to 82 dB. An intake system for a vehicle engine.

2. 2. The intake system for a vehicle engine according to claim 1, The porous member is formed using a fibrous material, and at least the portion that closes the opening has a fiber basis weight of 130 g / m ２ ~400g / m ２ It is set in the range of An intake system for a vehicle engine.

3. 3. The intake system for a vehicle engine according to claim 2, The porous member is formed using a nonwoven fabric. An intake system for a vehicle engine.

4. The intake system for a vehicle engine according to any one of claims 1 to 3, A radiator shroud is disposed around the outer periphery of the radiator and is housed in the engine compartment. the intake port is disposed on the radiator shroud and at a location forward of a rear end of the radiator in the front-rear direction of the vehicle. An intake system for a vehicle engine.

5. 5. The intake system for a vehicle engine according to claim 4, the intake duct has an upstream portion extending from the intake port toward a rear side in the front-to-rear direction of the vehicle, and a downstream portion that is downstream of the upstream portion in the flow direction of the fresh air and extends in a direction intersecting the front-to-rear direction of the vehicle, The opening is provided in the downstream portion. An intake system for a vehicle engine.

6. In an intake device for a vehicle engine according to any one of claims 1 to 5, The opening of the intake duct is disposed outward of the engine in the vehicle width direction. An intake system for a vehicle engine.

7. In an intake device for a vehicle engine according to any one of claims 1 to 6, the opening of the intake duct is provided so that an inner space of the intake duct is opened to the engine compartment via the porous member. An intake system for a vehicle engine.

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