JP5880486B2 - Intake sound transmission device for vehicle - Google Patents

Description

  The present invention relates to an intake sound transmission device for a vehicle, and more particularly to an intake sound transmission device for a vehicle including a sound guide duct for transmitting intake sound into a vehicle interior and a chamber portion for adjusting the sound quality of the intake sound.

2. Description of the Related Art Conventionally, there has been known an intake sound transmission device that transmits engine intake sound (also referred to as engine sound) generated in accordance with a traveling state of a vehicle or a change in the traveling state into a vehicle interior.
The intake sound transmission device of Patent Document 1 includes a sound guide duct that communicates an intake duct that introduces intake air to an engine and a vehicle interior, a speaker device that is disposed in the middle of the sound guide duct, and the speaker device. And a control device that performs drive control according to the engine speed, and a partition made of a breathable porous member is provided at a sound guide duct connecting portion that is a connection portion between the intake duct and the sound guide duct.

There is also known an intake sound transmission device that amplifies engine intake sound and transmits it to the vehicle interior.
The intake sound transmission device of Patent Document 2 includes a sound guide duct that communicates an intake duct for introducing intake air to the engine and a vehicle interior via a cowl box or a dash panel, and a resonance provided in the middle of the sound guide duct. And a membrane vibrating portion as a mechanism, and the inside of the membrane vibrating portion is configured to be partitioned by a vibrating membrane that amplifies intake sound by membrane vibration due to intake pulsation.

Blow-by gas containing unburned components leaked from the combustion chamber is generated in the crank chamber consisting of the cylinder block and oil pan with internal combustion of the engine. After collecting this blow-by gas, it returns to the intake duct and burns again. Things have been done.
Usually, the collected blow-by gas contains an oil mist such as lubricating oil. If the oil components are not sufficiently separated, the exhaust system catalyst may be adversely affected.
Therefore, an oil separator chamber for separating oil from blow-by gas is provided in the engine body, and a PCV valve (Positive Crankcase Ventilation valve) and a PCV pipe connected to the PCV valve are provided in the oil separator chamber, and downstream of the PCV pipe. The blow-by gas separated from the oil is returned to the intake duct by connecting the end to the intake duct via the blow-by gas intake.

JP 2006-276778 A JP 2008-267219 A

In the intake sound transmission device of Patent Document 1, since the speaker device is disposed in the middle of the sound guide duct, the intake sound transmission device may be increased in size and the layout in the engine room may be deteriorated. In addition, in this intake sound transmission device, there is a possibility that control may become complicated and processing load may increase because the running state of the vehicle matches the sound quality of the intake sound.
The intake sound transmission device of Patent Document 2 is advantageous for downsizing the device itself because the intake sound is amplified by a resonance mechanism (membrane vibration part) provided with a vibration membrane. However, since the technique of Patent Document 2 uses Helmholtz resonance, there is a possibility that the intake sound cannot be sufficiently amplified depending on the layout in the engine room.

The resonance frequency f obtained by Helmholtz resonance can be expressed by the following equation.
f = (C / 2π) × √ (πr ² / (V × (L + rσ))) (1)
C: sound velocity, r: duct radius, V: resonance chamber volume, L: duct length, σ: pipe end correction value.
Normally, in the intake sound transmission device, in order to amplify the intake pulsation in the low frequency band, it is necessary to decrease the duct radius or increase the resonance chamber volume or the duct length as shown in the equation (1). However, if the duct radius is too small, the transmitted sound pressure level decreases, so there is a limit to the transmission of intake pulsation. If the resonance chamber volume and the duct length are too large, the intake sound transmission device can be made compact. I can't. That is, depending on the frequency band to be amplified, an effective resonance mechanism cannot be configured, and intake pulsation (intake sound) in a desired frequency band cannot be reliably transmitted to the vehicle interior.

In addition, even with blow-by gas after passing through the oil separator chamber, oil recovery is not sufficient and oil mist may remain in the gas. When the sound duct connection portion to which the sound duct is connected is placed close to the sound duct, the oil mist enters the sound guide duct, and as a result, adheres to the vibration membrane of the resonance mechanism and causes intake pulsation in a desired frequency band. There is a possibility that it cannot be transmitted to the passenger compartment.
In particular, in vehicles such as hybrid vehicles and vehicles equipped with an idling stop mechanism, which frequently stop the engine even during operation, there is a risk of gradually intruding into the sound guide duct as the intake stops due to the engine being stopped when oil mist is repeated. is there.

  An object of the present invention is to provide a vehicle intake sound transmission device capable of preventing a reduction in intake sound transmission function while reducing the size of an engine room.

  According to a first aspect of the present invention, there is provided a vehicle intake sound transmission device that transmits intake sound from a pair of left and right front side frames disposed at left and right end portions of an engine room and an intake duct that introduces intake air to the engine into the vehicle interior. In a vehicle intake sound transmission device including a sound guide duct and a chamber portion provided in the middle portion of the sound guide duct for adjusting the sound quality of the intake sound, the upstream side of the sound guide duct upstream from the chamber portion. Is disposed above the one front side frame and extends in the vehicle width direction at a position above the blow-by gas suction portion of the engine, and upstream of the one front side frame and the sound guide duct. It is characterized in that an auxiliary machine or equipment is disposed between the two parts.

  In the vehicle intake sound transmission device according to the first aspect, since the auxiliary machine or device is disposed between the one front side frame and the upstream portion of the sound guide duct, the auxiliary machine or device that is a rigid body is provided between the bonnet and the rigid auxiliary machine or device. A duct upstream portion of the sound guide duct can be interposed, and an impact load acting on the pedestrian can be absorbed by the sound guide duct at the time of collision with the pedestrian.

  According to a second aspect of the present invention, in the first aspect of the present invention, the deformation-promoting concave portion that extends in the vehicle width direction along the upstream portion of the duct is formed on the lower surface portion of the bonnet that covers the upper side of the engine room. A trough for avoiding interference with the upstream portion of the sound guide duct is provided at the upper end portion of the machine or device, and the pair of inclined portions of the trough is a pair of connectors connected to the auxiliary device or device It is characterized by comprising each part of the upper end wall of the part.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the chamber portion is disposed in the vicinity of the rear side of the top portion of the strut tower provided in the vehicle width direction outer vicinity of the front side frame. The sound guide duct downstream portion downstream of the portion extends in the vehicle width direction along the front of the passenger compartment, and is configured by a rigid pipe member bent downward in a crank shape.

  The invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein the upstream portion of the sound guide duct includes a bellows portion and a resin pipe portion downstream of the bellows portion, and the chamber portion. The resin pipe portion is fixed to the strut tower via a mounting bracket.

According to the invention of claim 1, since the impact load acting on the pedestrian can be absorbed by the sound guide duct at the time of the collision with the pedestrian, the auxiliary machine or device is arranged on the front side frame, While arranging the sound guide duct between the auxiliary machine or the equipment, it is possible to achieve both the securing of the crash space provided between the bonnet and the auxiliary machine or the equipment and the reduction of the bonnet.
In addition, since the upstream part of the sound guide duct is located above the blow-by gas suction part, the blow-by gas suction part to which the PCV pipe is connected and the sound guide duct connection part to which the sound guide duct is connected are approached. Even if it arrange | positions, it can prevent that the oil mist remaining in blow-by gas penetrate | invades into a sound guide duct, and can prevent the intake sound transmission function fall accompanying oil adhesion.

  According to the invention of claim 2, since the bonnet is provided with a concave portion for promoting deformation at the time of collision, the deformation of the bonnet can be promoted to prevent the bonnet from retreating without particularly reinforcing the bonnet hinge, thereby improving safety. be able to. In addition, since the height position of the hood can be lowered while avoiding the interference between the hood and the sound guide duct, it is possible to reduce the vehicle hood.

  According to the invention of claim 3, since the length of the downstream portion of the sound guide duct can be adjusted using the space in the front of the passenger compartment, the intake sound having a desired frequency band can be produced without affecting the chamber portion or the like. Can be easily obtained. In addition, by configuring the downstream portion of the sound guide duct with a rigid pipe member, it becomes easy to insert it while avoiding other auxiliary machines and pipes, and the assembly workability to the vehicle body can be improved.

  According to the invention of claim 4, since the chamber portion and the resin pipe portion are fixed to a strut tower having a high resonance point and a high resonance point and different resonance points, resonance between the intake sound transmission device and the vehicle body side member is prevented. The noise can be prevented from being transmitted to the passenger compartment through the vehicle body. In addition, since the vibration of the chamber portion during traveling can be suppressed, the intake sound transmission device can be disposed in close proximity without interfering with the auxiliary equipment or equipment, so that the engine room can be further downsized.

1 is a schematic plan view of a front portion of a vehicle in which a bonnet according to Embodiment 1 of the present invention is omitted. It is the II-II sectional view taken on the line of Drawing 1 when an engine is omitted. It is the figure which looked at the vehicle diagonally forward from the vehicle interior. It is a schematic plan view of a bonnet, an intake sound transmission device, and PCM. It is the VV sectional view taken on the line of FIG. It is an assembly drawing of an intake sound transmission device. It is a figure which shows the transmission path | route of an intake sound. 6 is a longitudinal sectional view of a main part according to Embodiment 2. FIG.

  Hereinafter, modes for carrying out the present invention will be described based on examples. In this embodiment, the direction of arrow F is assumed to be the forward direction, and the direction of arrow L is assumed to be the left direction.

Embodiment 1 of the present invention will be described below with reference to FIGS.
In the present embodiment, a front-mounted engine 30, a front transmission including an automatic transmission (not shown) connected to the rear end of the engine 30, a propeller shaft (not shown) connected to the automatic transmission, and the like. The intake sound transmission device 40 of the midship FR vehicle V will be described as an example.

First, the main vehicle body structure will be described.
As shown in FIG. 1, the vehicle V includes a dash panel 3 installed so as to partition the engine room 1 and the vehicle compartment 2, and a pair of left and right front side frames 4 extending forward from the dash panel 3; A floor panel 5 that forms a bottom surface of the passenger compartment continuously from the lower end of the dash panel 3, and a tunnel portion 6 that extends in the front-rear direction by bulging the center in the vehicle width direction of the floor panel 5. ing.

  As shown in FIGS. 1 to 3, a bulging portion 3 a that bulges rearward is formed at the center in the vehicle width direction of the dash panel 3. The rear part of the engine 30 and a part of the automatic transmission are accommodated in the bulging part 3a, and the rear part of the automatic transmission, the propeller shaft (not shown), and the power plant frame (not shown) are accommodated in the tunnel part 6. Has been. As a result, since the heavy power train (engine 30 and automatic transmission) is disposed rearward of the vehicle body using the tunnel portion 6, the center of gravity of the vehicle can be brought closer to the front-rear center of the vehicle body. The steering moment and running stability can be improved by effectively reducing the yaw moment of inertia acting at times.

As shown in FIGS. 1, 3, and 7, the dash panel 3 is connected with a bowl-shaped cowl member 8 that protrudes backward toward the outer side in the vehicle width direction so as to correspond to the rear end of the bonnet 7 at the upper end. A brake member 23 is mounted on the side wall surface of the engine room corresponding to the right driver's seat 10.
In the upper left part of the dash panel 3, a harness insertion opening 3b and an opening 3c formed above the harness insertion opening 3b are formed so as to communicate the engine room 1 and the vehicle compartment 2. . An instrument panel 11 formed so as to bulge rearward from the rear end of the cowl member 8 is disposed behind the dash panel 3 so as to extend in the vehicle width direction when opened downward. The instrument panel 11 is provided so as to cover and cover the harness insertion opening 3b and the opening 3c from the rear side of the vehicle, and the air conditioning pro 12a and the conditioned air that can be blown into the vehicle compartment 2 with the dash panel 3 And an air conditioning main body 12b for adjusting the temperature of the air conditioning.
The surface of the side panel 9 constituting the side wall of the passenger compartment 2 is covered with a trim member (not shown).

As shown in FIGS. 4 and 5, the bonnet 7 has a closed cross section in which the bonnet outer panel 7 a and the bonnet inner panel 7 b cooperate.
The bonnet inner panel 7b has an annular groove 7c that is recessed upward in a trapezoidal cross section along the outer edge of the bonnet 7, and extends in the vehicle width direction at the middle portion in the front-rear direction of the bonnet 7 and is recessed upward in a wedge shape. The recessed portion 7d is formed.
The annular groove portion 7c increases the rigidity of the bonnet 7 while reducing the thickness of the bonnet outer panel 7a and the bonnet inner panel 7b. The deformation of the bonnet 7 is promoted while being bent. The deformation promoting recess 7d prevents the bonnet from retreating without excessively reinforcing the bonnet hinge.

As shown in FIG. 1, the pair of left and right front side frames 4 are formed in a substantially straight line forward at a position separated from the pair of left and right apron reinforcements 13 formed on the inner side of the side wall inward in the vehicle width direction. Each is arranged to extend. The front side frames 4 are connected to each other at their front end portions via a front cross member 14.
A pair of left and right strut towers 15 are formed between an intermediate portion of the pair of left and right front side frames 4 and a pair of left and right apron reinforcements 13, respectively. A pair of left and right tower brackets 16 for supporting the damper device (not shown) on the strut tower 15 are fixed to the tops of the pair of left and right strut towers 15, respectively. The rear portion of the left tower bracket 16 is provided with a fixing portion 16a projecting rearward.

  As shown in FIGS. 1, 2, 5, and 6, a power control module (hereinafter referred to as “PCM”) 17 is provided near the tower bracket 16 at the top of the left front side frame 4. 19 and a fuse box 18 is disposed in front of the PCM 17.

The PCM 17 is configured to be able to control an engine ignition mechanism, a fuel injection device, an intake / exhaust system, a valve mechanism, start control, and the like based on a plurality of sensor outputs. The PCM 17 is formed in a cubic shape, and includes detachable first and second connectors 17a and 17b at the upper end.
The first connector 17a is connected to the front end thereof with a first harness 20a for electrical connection to the fuse box 18. The first connector 17a has an inclined portion 17s that moves downward toward the rear upper end at the rear upper end, and a lock lever that is installed at the front so that the upper end that is the free end swings downward toward the rear. 17m etc.
By operating the lock lever 17m, the locked state of the first connector 17a can be released, and the first connector 17a can be detached from the PCM 17.

The second connector 17b is connected to the rear end thereof with a second harness 20b for electrical connection to the engine 30. The second connector 17b is installed in a substantially horizontal shape on the lower side of the inclined portion 17t, the inclined portion 17t moving upward toward the rear upper end portion, and the front end portion, which is a free end thereof, being located upward on the rear side. A rocking lever 17n that swings is provided.
By operating the lock lever 17n, the locked state of the second connector 17b can be released, and the second connector 17b can be detached from the PCM 17. The inclined portion 17s and the inclined portion 17t are arranged so as to face each other in the front-rear direction, and form a trough portion 21 that is recessed downward while facing the recessed portion 7d.

As shown in FIGS. 2 and 6, the PCM bracket 19 has a lower end of the vehicle width direction inner portion fastened to a vehicle width direction inner vertical wall portion of the front side frame 4, and an upper portion of the vehicle width direction inner portion is a tower bracket 16. Further, the fixing portion 19a is formed extending upward. The upper end of the vehicle width direction outer portion of the PCM bracket 19 extends upward and is fastened to the tower bracket 16.
The fuse box 18 is connected to the first and third harnesses 20a and 20c.
The first harness 20a is connected to the first connector 17a, and the third harness 20c is inserted into the harness insertion opening 3b and connected to various control devices and electrical components in the passenger compartment 2.

  The floor panel 5 is provided with a pair of left and right floor frames (not shown) extending in the front-rear direction on the lower surface, and provided with a pair of left and right side sills (not shown) extending in the front-rear direction at both left and right ends. The tunnel portion 6 has a front end portion joined to a rear end portion of the bulging portion 3a, and a tunnel reinforcement (not shown) extending in a substantially M-shaped front and rear direction at an upper portion thereof.

Next, the engine 30 will be described.
As shown in FIGS. 1 and 2, the engine 30 is composed of an in-line engine in which a crankshaft (not shown) is vertically arranged at the center in the vehicle width direction of the engine room 1 so as to extend in the front-rear direction. The portion is mounted in a state where it is partially accommodated in the bulging portion 3a.
The pair of tower bars 22 are respectively arranged in an inclined shape so as to move backward toward the inner side in the vehicle width direction.

As shown in FIGS. 1 and 2, the engine 30 includes an intake duct 31 extending from the left front portion of the engine 30 to the right front side, an intake manifold 32 installed on the left wall surface of the engine 30, and a right wall surface of the engine 30. An installed exhaust manifold 33, a throttle body 34 capable of adjusting the intake air amount, a blow-by gas pipe 35, an oil separator chamber (not shown) for separating oil mist from the blow-by gas, and the like are provided.
A connecting portion 36 extending upward is integrally formed in the middle portion of the intake duct 31.

The intake air that has passed through the air cleaner 37 flows through the intake duct 31 and is supplied to the intake manifold 32 after the flow rate is adjusted by the throttle body 34. Exhaust gas discharged from each combustion chamber is collected by the exhaust manifold 33 and discharged to the rear of the vehicle body.
The blow-by gas pipe 35 is connected to the connecting portion 36 via the blow-by gas suction portion 36 a, and returns the blow-by gas that has passed through the oil separator chamber and finished oil separation to the inside of the intake duct 31.

Next, the intake sound transmission device 40 will be described.
As shown in FIGS. 1 to 7, the intake sound transmission device 40 is configured to be able to adjust the sound quality of the intake sound of the engine 30 and transmit it to the interior of the passenger compartment 2.
The intake sound transmission device 40 includes a sound guide duct 41 that transmits intake sound from the intake duct 31 into the vehicle compartment 2, and a chamber portion 42 that is provided in the middle of the sound guide duct 41 and adjusts the sound quality of the intake sound. Etc.

The sound guide duct 41 includes a sound guide duct upstream portion 43 on the upstream side of the chamber portion 42, a sound guide duct downstream portion 44 on the downstream side of the chamber portion 42, and the like.
As shown in FIGS. 1 and 4 to 6, the sound guide duct upstream portion 43 is disposed above the front side frame 4 and the blow-by gas suction portion 36 a and is connected to the connection portion 36 of the intake duct 31. The first sound guide duct upstream portion 43a (bellows portion), the second sound guide duct upstream portion 43b (resin pipe portion) connected to the downstream end of the first sound guide duct upstream portion 43a, and the second sound guide duct And a third sound guide duct upstream portion 43c connected to the chamber portion 42 and connected to the downstream end of the upstream portion 43b.

  The first sound guide duct upstream portion 43a is formed of a flexible rubber bellows with a bellows, and is configured to extend in a substantially upwardly inclined manner outward in the vehicle width direction in a state where at least a part of the concave portion 7d is overlapped in a plan view. Has been. The upstream end portion of the first sound guide duct upstream portion 43a is connected to a sound guide duct connection portion 36b whose center is formed at a position higher than the center of the blow-by gas suction portion 36a, and the first sound guide duct upstream portion. The downstream end of 43a is disposed at a position near the inside in the vehicle width direction of the PCM 17 in plan view.

  The second sound guide duct upstream portion 43b is disposed at a position higher than the blow-by gas suction portion 36a. The second sound guide duct upstream portion 43b is made of a synthetic resin pipe having a predetermined rigidity that is higher in rigidity than the first sound guide duct upstream portion 43a and is less deformed by running vibration, and is recessed portion 7d in plan view. And in a state of being overlapped with the valley portion 21 so as to extend substantially linearly outward in the vehicle width direction. The upstream side portion of the second sound guide duct upstream portion 43b is fixed to the fixing portion 19a of the PCM bracket 19 via a rubber mount. Accordingly, since the relative position of the PCM 17 with respect to the first and second connectors 17a and 17b hardly changes even when traveling vibration is received, the second sound guide duct upstream portion 43b and the first and second connectors 17a and 17b are connected. It is arranged close to the vertical direction while preventing interference. The downstream end of the second sound guide duct upstream portion 43b is disposed above the connecting portion between the tower bracket 16 on the left side and the tower bar 22 in plan view.

  The third sound guide duct upstream portion 43c is disposed at a position higher than the blow-by gas suction portion 36a. The third sound guide duct upstream portion 43c is made of a rubber hose having higher rigidity (high elastic coefficient) than the first sound guide duct upstream portion 43a and having a small deformation due to running vibration. After extending outward in the width direction, it is configured to bend backward and connect to the chamber portion 42.

The chamber portion 42 is formed in a cylindrical shape, is disposed in the vicinity of the rear portion of the left strut tower 15, and is a mounting bracket portion integrally formed with the chamber portion 42 in a state of being superimposed on the annular groove portion 7 c in plan view. 45. The mounting bracket portion 45 has an outer end portion in the vehicle width direction fastened to the upper portion of the apron rain 13, and an inner end portion in the vehicle width direction fixed to the fixing portion 16a of the tower bracket 16 via a rubber mount. The mounting bracket portion 45 may be a separate bracket from the chamber portion.
The chamber part 42 includes a vibrating body (not shown) that vibrates using the intake pulsation as an excitation source, a cylindrical resonance part 42a for amplifying the sound pressure level of the intake sound in a predetermined frequency band, and the like.
The vibrating body is housed inside the chamber portion 42, and includes a bellows portion (not shown), a thin-film-like vibrating surface portion (not shown) that closes the end portion, and the like.

  As shown in FIGS. 1 to 4, 6, and 7, the sound guide duct downstream portion 44 is higher in rigidity than the first sound guide duct upstream portion 43 a and has a predetermined rigidity that is less deformed by its own weight or traveling vibration. The resonance portion 42a of the chamber portion 42 and the opening 3c formed in the dash panel 3 are connected to each other. The downstream end 44 of the sound guide duct is connected to the resonance portion 42a at the upstream start end, extends outward in the vehicle width direction along the front surface of the passenger compartment (dash panel 3), and bends downward in a crank shape. The discharge port 44a is connected to the opening 3c. The intake sound amplified by the resonance part 42a is transmitted through the downstream part 44 of the sound guide duct and released into the vehicle compartment 2 from the discharge port 44a (opening 3c).

The intake sound released from the discharge port 44a is transmitted to the passenger on the driver's seat 10 side through the first to fourth transmission paths R1 to R4.
As shown in FIGS. 1 and 7, in the first transmission path R <b> 1, the intake sound released from the discharge port 44 a is reflected in the instrument panel 11 and directly transmitted to the occupant. In the second transmission path R <b> 2, the intake sound emitted downward from the discharge port 44 a is reflected by the floor panel 5 and transmitted to the occupant. In the third transmission path R3, the intake sound emitted upward from the discharge port 44a is reflected by the lower surface of the cowl member 8, and the reflected sound is reflected by the floor panel 5 and transmitted to the occupant. In the fourth transmission path R4, the intake sound emitted from the discharge port 44a to the rear in the vehicle width direction is reflected by the side panel 9 in the passenger compartment 2, and the reflected sound is reflected directly or by the floor panel 5. To the passenger (see FIG. 1).
Thereby, the intake sound emitted from the discharge port 44a bypasses the obstacles such as the tunnel part 6, the air conditioning blower 12a, the air conditioning main body part 12b, the instrument panel 11 and the like by the transmission paths R2 to R4 in addition to the transmission path R1. Then, it is transmitted well to the passenger in the driver's seat 10.

Next, functions and effects of the intake sound transmission device 40 for the vehicle V according to the first embodiment will be described.
According to the intake sound transmission device 40 of the vehicle V, the impact load acting on the pedestrian can be absorbed by the sound guide duct 41 in the event of a collision with the pedestrian. It is possible to achieve both the securing of the crash space provided between the hood 7 and the PCM 17 and the reduction of the hood while arranging the sound guide duct between the hood and the auxiliary machine or equipment.
In addition, since the sound guide duct upstream portion 43 (sound guide duct connection portion 36b) is disposed above the blow-by gas suction portion 36a, the blow-by gas suction portion 36a to which the PCV pipe 35 is connected and the sound guide duct. Even if the sound guide duct connecting part 36b to which the terminal 41 is connected is disposed close to the sound guide duct 41, the oil mist remaining in the blow-by gas can be prevented from entering the sound guide duct 41. A decrease can be prevented.

  The bonnet inner panel 7b of the hood 7 that covers the upper portion of the engine room 2 avoids interference between the recessed portion 7d extending in the vehicle width direction along the sound guide duct upstream portion 43 and the sound guide duct upstream portion 43 at the upper end portion of the PCM 17. And a pair of inclined portions 17 s and 17 t of the valley portion 21 are respectively constituted by part of the upper end walls of the first and second connectors 17 a and 17 b connected to the PCM 17. Thereby, since the recessed part 7d was provided in the bonnet 7, the deformation | transformation of the bonnet 7 can be accelerated | stimulated, and retraction of a bonnet can be prevented, without strengthening a bonnet hinge especially, and safety can be made high. Moreover, since the height position of the bonnet 7 can be lowered while avoiding the interference between the bonnet and the sound guide duct, the vehicle V can be lowered.

  The chamber portion 42 is disposed in the vicinity of the rear side of the top portion of the strut tower 15 provided in the vicinity of the outer side in the vehicle width direction of the front side frame 4, and the sound guide duct downstream portion 44 on the downstream side of the chamber portion 42 is the vehicle interior. 2 It is composed of a synthetic resin pipe that extends in the vehicle width direction along the front surface and then bends downward in a crank shape. Thereby, since the length of the sound guide duct downstream portion 44 can be adjusted using the space in front of the passenger compartment 2, intake sound having a desired frequency band can be easily obtained without affecting the chamber portion 42 and the like. Can get to. Also, by constructing the sound guide duct downstream portion 44 with a synthetic resin pipe having a predetermined rigidity, it becomes easy to insert it while avoiding other auxiliary machines, pipes, harnesses, etc., and power trains such as engines, other auxiliary machines, etc. It becomes easy to assemble after assembling, and the assembling workability to the vehicle body can be improved.

  The sound guide duct upstream portion 43 includes a first sound guide duct upstream portion 43a and a second sound guide duct upstream portion 43b on the downstream side of the first sound guide duct upstream portion 43a, and the chamber portion 42 and the second sound guide duct. The upstream portion 43 b is fixed to the strut tower 15 via the fixing portion 16 a of the tower bracket 16 and the fixing portion 19 a of the PCM bracket 19. Since the strut tower 15 supports the suspension damper, the strut tower 15 has relatively high rigidity in the vehicle body structure and has a high resonance point. Accordingly, since the chamber portion 42 and the second sound guide duct upstream portion 43b are fixed to the strut tower 15 having different resonance points, resonance between the intake sound transmission device 40 and the strut tower 15 on the vehicle body side can be prevented. Further, since the intake sound transmission device 40 can be disposed close to the PCM 17 without interfering with the PCM 17, the engine room 1 can be further downsized.

Next, an intake sound transmission device 40A according to Example 2 will be described with reference to FIG.
Only the configuration different from that of the first embodiment will be described, and the same members as those of the first embodiment are denoted by the same reference numerals and the description thereof will be omitted.

As shown in FIG. 8, the dash panel 3 is provided with a bowl-shaped cowl member 8 </ b> A projecting rearward so as to correspond to the rear end of the bonnet 7 at the upper end.
The cowl member 8A has an insertion hole 8a formed in the left side portion of the front wall and an insertion hole 8b formed in the left side portion of the rear wall. In front view, the insertion hole 8b is disposed on the inner side in the vehicle width direction than the insertion hole 8a.

The intake sound transmission device 40A includes a sound guide duct 41A that transmits the intake sound from the intake duct 31 into the passenger compartment 2, and a chamber portion 42A that is provided in the middle of the sound guide duct 41A and adjusts the sound quality of the intake sound. Etc.
The sound guide duct 41A includes a sound guide duct upstream portion 43A on the upstream side of the chamber portion 42A, a sound guide duct downstream portion 44A on the downstream side of the chamber portion 42A, and the like.
The sound guide duct upstream portion 43A is disposed above the front side frame 4 and the blow-by gas suction portion 36a.

The chamber portion 42A is fixed to the insertion hole 8a, the sound guide duct downstream portion 44A extends inward in the vehicle width direction and then bends downward, and the discharge port 44b is connected to the insertion hole 8b.
Therefore, the intake sound released from the discharge port 44b of the sound guide duct downstream portion 44A is released so as to move toward the inner side in the vehicle width direction toward the rear side with respect to the floor panel 5, and to the passenger of the driver seat 10 Intake sound is transmitted from 30 directions.

Next, a modification in which the above embodiment is partially changed will be described.
1] In the above embodiment, an example of PCM as an auxiliary machine or device has been described. However, any member may be used as long as it is a member disposed on the upper side of the front side frame, such as a fuse box, a battery, or other electrical components. Can also be applied.

2] Although the example applied to the FR vehicle has been described in the above embodiment, it may be applied to the FF vehicle. Further, the present invention may be applied to a horizontal engine, and the same effect can be achieved regardless of the engine type and the engine arrangement structure.
3) In addition, those skilled in the art can implement the present invention by adding various modifications to the embodiments without departing from the spirit of the present invention, and the present invention includes such modifications. is there.

  The present invention relates to an intake sound transmission device for a vehicle including a sound guide duct for transmitting intake sound to a vehicle interior and a chamber portion for adjusting the sound quality of the intake sound. Prevents deterioration of sound transmission function.

1 Engine room 2 Car compartment 4 Front side frame 7 Bonnet 7d Recess 15 Strut tower 16 Tower bracket 17 PCM
17a first connector 17b second connector 17s (first connector) inclined portion 17t (second connector) inclined portion 21 valley portion 30 engine 31 intake duct 36a blowby gas intake portion 40, 40A intake sound transmission device 41, 41A sound guide duct 42, 42A Chamber part 43, 43A Sound duct upstream part 43a First sound duct upstream part 43b Second sound duct upstream part 44, 44A Sound duct downstream part V Vehicle

Claims (4)

A pair of left and right front side frames disposed at the left and right end portions of the engine room, a sound guide duct for transmitting intake sound from the intake duct for introducing intake air to the engine into the vehicle interior, and a middle portion of the sound guide duct And an intake sound transmission device for a vehicle provided with a chamber portion for adjusting the sound quality of the intake sound,
A sound guide duct upstream portion upstream of the chamber portion is disposed at a position above the one front side frame and extends in a vehicle width direction at a position above the blow-by gas suction portion of the engine,
An intake air transmission device for a vehicle, wherein an auxiliary machine or a device is disposed between the one front side frame and the upstream portion of the sound guide duct. A concave portion for promoting deformation at the time of a collision extending in the vehicle width direction along the upstream portion of the sound guide duct on the lower surface portion of the bonnet that covers the upper portion of the engine room, and the upstream portion of the duct at the upper end portion of the accessory or equipment And a valley for avoiding interference,
2. The vehicle intake sound transmission according to claim 1, wherein the pair of inclined portions of the valley portion is configured by a part of an upper end wall of a pair of connector portions connected to the auxiliary machine or device. apparatus. The chamber portion is disposed in the vicinity of the rear side of the top of the strut tower provided in the vehicle width direction outer side of the front side frame;
The downstream portion of the sound guide duct downstream from the chamber portion is formed of a rigid pipe member extending in the vehicle width direction along the front surface of the passenger compartment and bent downward in a crank shape. An intake sound transmission device for a vehicle according to claim 1. The upstream part of the sound guide duct comprises a bellows part and a resin pipe part downstream of the bellows part,
The vehicle intake sound transmission device according to any one of claims 1 to 3, wherein the chamber portion and the resin pipe portion are fixed to the strut tower via a mounting bracket.