JP4835943B2 - Intake sound amplifying device for vehicle engine - Google Patents

Description

  The present invention relates to a vehicle engine intake sound amplifying device, and more particularly, a vehicle that transmits engine intake sound to a vehicle compartment side by an intake sound introduction passage communicated with an engine intake passage disposed in an engine room. The present invention relates to an intake air amplifying device for an engine.

  2. Description of the Related Art Conventionally, an intake sound amplifying apparatus that amplifies intake sound of a vehicle engine and introduces the intake sound into a vehicle interior is known (for example, see Patent Document 1). The intake sound amplifying device described in Patent Literature 1 includes an intake sound introduction passage, one end of the intake sound introduction passage communicates with an intake passage of an engine disposed in the engine room, and the other end is a rear portion of the engine room. Are communicated with each other in the partition space formed.

  Membrane vibration means is disposed in the intake sound introduction passage of the intake sound amplification device so as to partition the intake passage side of the engine and the compartment space side. Thus, the membrane vibration means can amplify the intake sound due to the intake pulsation and transmit it to the compartment space, and introduce the amplified intake sound into the vehicle compartment via the compartment space.

JP 2006-348915 A

  However, in the intake sound amplifying device described in Patent Document 1, since the intake sound introduction passage communicates with a partition space (for example, a cowl box), the fuel in the intake passage of the engine is damaged when the membrane vibration means is damaged. There is a possibility that the vaporized component may be introduced into the vehicle interior via the intake sound introduction passage and the partition space.

  The present invention has been made to solve such a problem, and even when the membrane vibration means arranged in the intake sound introduction passage is damaged, the fuel vaporization in the intake passage on the vehicle compartment side is achieved. An object of the present invention is to provide an intake sound amplifying apparatus for a vehicle engine that can prevent components from being introduced.

In order to achieve the above object, the present invention provides an intake sound amplifying apparatus for a vehicle engine for introducing an intake sound of an engine disposed in an engine room of a vehicle to a vehicle compartment side. An intake sound introduction passage having one end communicated with the intake passage and the other end communicated with the interior of the vehicle compartment through a cowl box or a dash panel, and the intake sound introduction passage disposed in the intake sound introduction passage. A membrane vibration means for vibrating the membrane by pulsation, and a breathable member is disposed in the intake sound introduction passage closer to the vehicle compartment side than the membrane vibration means, and this breathable member is for adsorbing a fuel vaporized component. The adsorbent is mixed, and the air-permeable member is characterized in that a particulate adsorbent is dispersed and mixed in a foam having an open-cell structure .

  According to the present invention configured as described above, the intake sound using the intake pressure vibration as a sound source is guided to the membrane vibration means via the intake sound introduction passage communicated with the intake pipe of the engine, and is amplified. Sound can be further transmitted to the vehicle interior via the cowl box or the dash panel via the intake sound introduction passage. At this time, the breathable member arranged in the intake sound introduction passage allows the membrane vibration means side to communicate with the cowl box side or the cabin side so that the intake sound can be vented without blocking or attenuating the intake sound. Can be passed.

  And according to this invention, the air permeable member is arrange | positioned in the intake sound introduction channel | path, The adsorbent for fuel vaporization component adsorption | suction is mixed in this air permeable member. Thus, even when the membrane vibration means is damaged and the intake passage of the engine and the cowl box side or the cabin side are communicated with each other, the fuel vaporization component flowing from the intake passage of the engine is absorbed by the adsorbent. Since it can be adsorbed, it is possible to prevent the fuel vaporization component from flowing into the passenger compartment.

Further, according to the present invention, the air-permeable member is in the foam substrate of open cell structure, the particulate adsorbent is configured by dispersedly mixed, when forming the foam breathability member, The adsorbent can be dispersedly arranged in the air-permeable member and can be easily formed.

In order to achieve the above object, the present invention provides an intake sound amplifying device for a vehicle engine for introducing intake sound of an engine disposed in an engine room of a vehicle to a vehicle compartment side, An intake sound introduction passage having one end communicated with the intake passage of the engine and the other end communicated with the interior of the vehicle compartment through a cowl box or a dash panel, and disposed within the intake sound introduction passage. A membrane vibration means that vibrates due to the intake pulsation, and a breathable member is disposed in the intake sound introduction passage closer to the passenger compartment than the membrane vibration means. And a ventilation layer that supports the adsorption layer in the intake sound introduction passage, and the breathable member is characterized in that at least the ventilation layer is formed of a foam having an open-cell structure. Yes.

  According to the present invention configured as described above, the intake sound using the intake pressure vibration as a sound source is guided to the membrane vibration portion via the intake sound introduction passage communicated with the intake pipe of the engine, and is amplified. Sound can be further transmitted to the vehicle interior via the cowl box or the dash panel via the intake sound introduction passage. At this time, the breathable member arranged in the intake sound introduction passage allows the membrane vibration means side to communicate with the cowl box side or the cabin side so that the intake sound can be vented without blocking or attenuating the intake sound. Can be passed.

  According to the present invention, a breathable member is disposed in the intake sound introduction passage, and the breathable member supports the adsorption layer for fuel vaporization component adsorption by the ventilation layer in the intake sound introduction passage. It is configured. As a result, even if the membrane vibration means is damaged and the intake passage of the engine communicates with the passenger compartment side, the fuel vaporization component flowing in from the intake passage of the engine can be adsorbed by the adsorption layer. As a result, it is possible to prevent the fuel vaporization component from flowing into the passenger compartment.

Further, according to the present invention, the air-permeable member, since at least the ventilation layer is formed by open cell foam structure, facilitates the permeable member with foam having an open cell structure such as foamed urethane resin material Can be formed.

  According to the intake sound amplifying device for a vehicle engine of the present invention, even when the membrane vibration means arranged in the intake sound introduction passage is damaged, the fuel vaporization component in the intake passage is introduced into the passenger compartment side. Can be prevented.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. First, an intake sound amplifying device for a vehicle engine according to a first embodiment of the present invention will be described with reference to FIGS.
1 is a view of an engine room of a vehicle according to a first embodiment of the present invention as viewed from above, FIG. 2 is a view of an intake sound amplifying device as viewed from above, and FIG. 3 is a sectional view taken along line III-III in FIG. 4 is a partially enlarged view of FIG.

  As shown in FIG. 1, the vehicle 1 has an engine room 3 that is partitioned by a dash panel 4 in front of the passenger compartment 2. A cowl box 10 that is a closed space is provided behind the engine room 3. The cowl box 10 includes a cowl main body 11 that is positioned in front of the passenger compartment 2 at the top of the dash panel 4 and extends in the vehicle width direction, and a cowl grill 12 that covers the upper opening of the cowl main body 11. (See FIG. 3). The cowl grill 12 is formed with a mesh-shaped communication hole 13 in a predetermined region for taking outside air into the cowl box 10.

  In addition, an in-line four-cylinder engine 20 is arranged in a vertically placed form with the cylinder row direction in the vehicle front-rear direction in the rear center portion in the engine room 3. An intake manifold 21 is disposed on the left side of the engine 20 and an exhaust manifold 22 is disposed on the right side of the vehicle.

  A downstream end of an L-shaped intake pipe 23 is connected to an upstream side intake pipe 21 a that introduces outside air into the intake manifold 21. An air cleaner 24 disposed in front of the engine room 3 is connected to the upstream end of the intake pipe 23. A throttle body 21 b is attached to the upstream side intake pipe 21 a of the intake manifold 21. In the present embodiment, the intake passage of the engine 20 is configured by the upstream side intake pipe 21a, the intake pipe 23, and the like.

  As shown in FIG. 2, the intake sound amplifying device 30 according to the present embodiment includes a vibration generating pipe portion 31 having one end connected to the intake pipe 23 and a membrane vibrating portion attached to the other end side of the vibration generating pipe portion 31. 33, and a vibration transmission pipe portion 35 having one end connected to the membrane vibrating portion 33 and the other end connected to the dash panel 4. In the present embodiment, the vibration generating tube portion 31, the membrane vibrating portion 33, and the vibration transmitting tube portion 35 constitute an intake sound introduction passage.

The vibration generating pipe portion 31 is formed by a plurality of pipes to have a predetermined pipe length, and does not extend linearly from the connection portion with the intake pipe 23 to the membrane vibration portion 33 but from the connection portion with the intake pipe 23 to the vehicle. It is connected to the membrane vibration part 33 through a path extending outward and forward.
As shown in FIG. 3, the membrane vibration part 33 has a configuration in which a synthetic resin or rubber vibration film 33b is arranged inside a cylindrical body 33a, and is fixed to the inner wall of the engine room 3 via a bracket. ing. The vibration membrane 33b partitions the vibration generating tube portion 31 and the vibration transmission tube portion 35 in the vehicle front-rear direction. As will be described later, the vibration membrane 33b vibrates due to the intake air pulsation of the engine 20 and amplifies the intake sound. It is transmitted to the chamber 2 side. In the present embodiment, the membrane vibration part 33 constitutes a membrane vibration means.

The vibration transmission pipe part 35 has a duct part 36 whose one end is externally fitted to the cylindrical body 33 a of the membrane vibration part 33, and a connection receiving member 37 which is externally fitted to the other end of the duct part 36.
The connection receiving member 37 includes a cylindrical portion 37a connected to the duct portion 36, and an annular flange portion 37b that extends radially from the end of the cylindrical portion 37a on the vehicle compartment 2 side (see FIG. 4). ). The dash panel 4 that partitions the engine room 3 and the vehicle compartment 2 has an opening 4a. The connection receiving member 37 has a cylindrical portion 37a inserted into the opening 4a from the rear of the vehicle, and a flange portion 37b. It is attached to the dash panel 4 by being fixed to the dash panel 4 by fastening means.
In the present embodiment, the cylindrical portion 37a extends only from the flange portion 37b to the front of the vehicle. However, the present invention is not limited thereto, and the cylindrical portion 37a may extend from the flange portion 37b to the vehicle compartment 2 side.

As shown in FIG. 4, a breathable member 40 is disposed on the vehicle compartment 2 side of the membrane vibration portion 33 and in the vicinity of the end portion of the duct portion 36 of the vibration transmission pipe portion 35 on the vehicle compartment 2 side. ing.
The breathable member 40 is a foam having an open cell structure such as a foamed urethane resin material, and is formed in a columnar or elliptical shape having a predetermined axial length. The breathable member 40 is inserted and fixed in the inner diameter portion of the duct portion 36. The breathable member 40 may be a hard member, or may be soft and elastic.

Since the air-permeable member 40 has open cells, the one end side and the other end side in the axial direction communicate with each other so that air can pass therethrough. Is not cut off or attenuated.
Further, the air-permeable member 40 is mixed with an adsorbent 41 for adsorbing vaporized components of vehicle fuel. In the present embodiment, the adsorbent 41 is activated carbon particles. The breathable member 40 is formed by mixing activated carbon particles in a resin solution and foaming, and the activated carbon particles are dispersedly arranged inside.
In addition to the vicinity of the rear end portion of the duct portion 36, the air permeable member 40 may be disposed in the cylindrical portion 37 a of the connection receiving member 37 as indicated by a virtual line in FIG. 4.

Next, the operation (operation) of the intake sound amplifying apparatus for a vehicle engine according to the above-described embodiment will be described.
While the engine 20 is operating, pressure fluctuations due to intake air pulsations occur in the intake manifold 21 and the intake pipe 23, and the intake sound due to the pressure fluctuations is amplified by the intake sound amplifier 30 and transmitted to the vehicle compartment 2 side. Is done. In particular, when the vehicle 1 is accelerated by depressing the accelerator pedal, the intake sound is introduced into the passenger compartment 2 so that the driver can feel a sense of dynamism.

  Specifically, the intake pulsation in the intake pipe 23 is first transmitted to the membrane vibration part 33 via the vibration generation pipe part 31. Thereby, the membrane vibration part 33 amplifies the intake sound accompanying the intake pulsation by the vibration film 33 b, and transmits the amplified intake sound to the vibration transmission pipe part 35.

  The intake sound transmitted to the vibration transmission pipe portion 35, that is, the intake pulsation, passes through the breathable member 40 having an open cell structure with almost no attenuation, and is introduced into the vehicle compartment 2 through the dash panel 4. The

  Since the vibration generating pipe portion 31 of the intake sound amplifying device 30 communicates with the intake port of the engine 20 via the intake pipe 23 and the intake manifold 21, the fuel vaporization component floats in the vibration generating pipe portion 31. . However, in the intake sound amplifying device 30 of the present embodiment, since the membrane vibration part 33 partitions the vibration generation pipe part 31 and the vibration transmission pipe part 35, the fuel vaporization component does not flow into the vehicle compartment 2 side. It is like that.

  However, when the vibrating membrane 33b of the membrane vibrating portion 33 is damaged due to deterioration over time or the like, the fuel vaporization component flows into the vehicle compartment 2 from the vibration generating tube portion 31 through the membrane vibrating portion 33 and the vibration transmitting tube portion 35. End up. In this case, the occupant feels uncomfortable due to the fuel vaporization component flowing into the passenger compartment 2.

  In the intake sound amplifying device 30 of the present embodiment, even when the vibration membrane 33b is damaged in this way, the fuel vaporization component is prevented from flowing into the passenger compartment 2, and the passenger may feel uncomfortable. Is configured to not. That is, in the intake sound amplifying device 30 of the present embodiment, when the fuel vaporization component flows into the vibration transmission pipe portion 35 due to the breakage of the vibration membrane 33b, the adsorbent 41 mixed in the air permeable member 40 is removed. It is possible to adsorb the fuel vaporization component and prevent the fuel vaporization component from flowing into the passenger compartment 2 side.

  Further, in the intake sound amplifying device 30 of the present embodiment, since the air-permeable member 40 including the adsorbent 41 is located closer to the vehicle compartment 2 than the vibration membrane 33b, the fuel vaporization component is not adsorbed during normal times. It is possible to stand by while maintaining the fuel vaporization component adsorption performance. And the air permeable member 40 can exhibit the fuel vaporization component adsorption | suction performance which was maintained when the diaphragm 33b was damaged by any chance.

Next, referring to FIG. 5, a breathable member of the intake sound amplifying device according to the second embodiment of the present invention will be described. In the second embodiment, the configuration other than the breathable member is the same as that of the first embodiment.
As shown in FIG. 5, in the present embodiment, the breathable member 40 is a foam having an open cell structure such as a foamed urethane resin material, and the adsorption layer 44 is vented on both sides in the longitudinal direction of the vibration transmission pipe portion 35. The layers 42 and 43 are configured to be sandwiched and held. The ventilation layers 42 and 43 are both substantially circular or oval in cross section, and the ventilation layer 42 has a recess 42a on the side surface on the ventilation layer 43 side, and the ventilation layer 43 has a recess 42a on the side surface on the ventilation layer 42 side. The fitting 43a which can be fitted is formed. The adsorption layer 44 includes an adsorbent 41 and is formed in a disk shape having a diameter that fits into the recess 42a.
Note that the adsorbing layer 44 may be composed of only granular, powdery, or (semi) solid adsorbents without a substrate having an open cell structure. If comprised in this way, manufacture can be made easier.

This breathable member 40 is configured as an integral member by disposing the adsorption layer 44 in the recess 42a of the ventilation layer 42 and fitting the projection 43a of the ventilation layer 43 into the recess 42a.
Even if the air-permeable member 40 is configured in this manner, the same effects as those of the first embodiment can be obtained.
In the present embodiment, the ventilation layers 42 and 43 are configured to sandwich the adsorption layer 44 on both sides in the longitudinal direction of the vibration transmission tube portion 35. However, the present invention is not limited to this, and the adsorption layer is formed by a plurality of ventilation layers. Any structure may be used as long as the structure is supported. For example, the configuration may be such that the adsorption layer is sandwiched between two semi-cylindrical ventilation layers, or the adsorption layer may be fixed to one ventilation layer by adhesion or the like.
In addition to activated carbon, activated carbon fibers, molecular sieve carbon, silica gel, activated alumina, zeolite, and the like can be used as the adsorbent.

Next, an intake sound amplifying device according to a third embodiment of the present invention will be described with reference to FIG. In 3rd Embodiment, the same code | symbol is attached | subjected about the element same as 1st Embodiment, and the overlapping description is abbreviate | omitted.
In the present embodiment, the intake sound amplifying device 30 is connected to the cowl box 10 instead of the dash panel 4.

In the present embodiment, the vertical wall 11a on the vehicle front side of the cowl body 11 is provided with an opening 11b in an upper portion spaced upward from the bottom wall, and the connection receiving member 37 has a cylindrical portion in the opening 11b. 37 a is inserted from the rear of the vehicle, and the flange portion 37 b is fixed to the vertical wall 11 a by fastening means, thereby being attached to the cowl box 10.
Further, the air permeable member 40 can be disposed in the duct portion 36 or the connection receiving member 37 of the vibration transmission pipe portion 35. Further, the breathable member 40 may be one in which the adsorbent 41 is mixed as in the first embodiment, or may be one in which the adsorption layer 44 is supported as in the second embodiment.

  In the intake sound amplifying device 30 configured as described above, the intake sound transmitted from the engine 20 side through the vibration generating pipe portion 31, the membrane vibrating portion 33, and the vibration transmitting tube portion 35 is introduced into the cowl box 10, It can be introduced into the vehicle compartment 2 through the wall portion of the cowl body 11 and through an air conditioner passage (not shown) connected to the cowl main body 11 and communicating with the interior of the vehicle compartment 2.

  Also in the present embodiment, when the vibration film 33b is damaged, the fuel vaporization component can be adsorbed by the air-permeable member 40 as in the above-described embodiment. Can be prevented.

  In the above-described embodiment, the air-permeable member 40 is a member that ensures air permeability as an open-cell structure by foam molding, but is not limited thereto, and other air-permeable members may be used. For example, a pad-like nonwoven fabric made of synthetic fibers may be used.

It is the figure which looked at the engine room of the vehicle in a 1st embodiment of the present invention from the upper part. It is the figure which looked at the intake sound amplification device in a 1st embodiment of the present invention from the upper part. It is the III-III sectional view taken on the line of FIG. FIG. 4 is a partially enlarged view of FIG. 3. It is sectional drawing of the air permeable member of the intake sound amplifier in 2nd Embodiment of this invention. It is sectional drawing of the intake sound amplifier in 3rd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vehicle 2 Car compartment 3 Engine room 4 Dash panel 10 Cowl box 12 Cowl grill 13 Communication hole 20 Engine 21 Intake manifold 22 Exhaust manifold 23 Intake pipe 24 Air cleaner 30 Intake sound amplifying device 31 Vibration generating pipe section 33 Membrane vibration section 33a Cylindrical shape Body 33b Vibration membrane 35 Vibration transmission pipe portion 36 Duct portion 37 Connection receiving member 37a Tubular portion 37b Flange portion 40 Breathable member 41 Adsorbent 42a Concavity 42, 43 Breathing layer 43a Convex portion 44 Adsorption layer

Claims (2)

An intake sound amplifying device for a vehicle engine for introducing an intake sound of an engine disposed in an engine room of a vehicle to a vehicle compartment side,
An intake sound introduction passage having one end communicated with the intake passage of the engine and the other end communicated with the interior of the vehicle compartment through a cowl box or a dash panel;
A membrane vibration means disposed in the intake sound introduction passage and vibrating membrane by intake pulsation in the intake passage of the engine,
In the intake sound introduction passage, a breathable member is disposed closer to the vehicle compartment side than the membrane vibration means,
This breathable member is mixed with an adsorbent for adsorbing fuel vaporized components ,
The air-breathing member is configured by dispersing the particulate adsorbent in a foam having an open-cell structure, and an intake sound amplifying device for a vehicle engine. An intake sound amplifying device for a vehicle engine for introducing an intake sound of an engine disposed in an engine room of a vehicle to a vehicle compartment side,
An intake sound introduction passage having one end communicated with the intake passage of the engine and the other end communicated with the interior of the vehicle compartment through a cowl box or a dash panel;
A membrane vibration means disposed in the intake sound introduction passage and vibrating membrane by intake pulsation in the intake passage of the engine,
In the intake sound introduction passage, a breathable member is disposed closer to the vehicle compartment side than the membrane vibration means,
The breathable member includes an adsorption layer for adsorbing a fuel vaporized component, and a ventilation layer that supports the adsorption layer in the intake sound introduction passage .
An air intake sound amplifying device for a vehicle engine, wherein at least the air permeable layer of the air permeable member is formed of a foam having an open cell structure .

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