JP2007321724A - Intake noise emphasizing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an intake noise emphasizing device which generates powerful intake noise and improves a flexibility in layout. <P>SOLUTION: The intake noise emphasizing device is provided with: a communication pipe attached on an outer circumference surface of an intake duct forming an intake passage to an engine and communicating to the intake duct; and an elastic film member 16 closing the communication pipe and elastically deforming according to change of intake vacuum generated on gas in the intake duck and vibrating in a surface outward direction during intake process of the engine. The elastic film member 16 has a construction including three elastic film construction parts 30a to 30c divided by a groove 32 provided on a surface in the suction duct side of the elastic film member 16, each elastic film construction part 30a to 30c is formed in a shape an area of which is different from each other in a view from a thickness direction of the elastic film member 16 to make different resonance frequency of vibration in the surface outward direction of the elastic film member 16 of each elastic film construction part. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an apparatus for improving the quality of intake sound generated from an intake system of, for example, an automobile.

As a conventional intake sound enhancement device, for example, there is one described in Patent Document 1. This intake sound emphasizing device has a plurality of intake ducts having mutually different resonance frequencies, and has a sense of power by generating intake sounds in a plurality of intake ducts during high engine loads such as during acceleration. Intake sound is introduced into the passenger compartment.
Japanese Patent No. 3613665 (FIG. 1)

However, since the intake sound enhancement device described in Patent Document 1 has a configuration having a plurality of intake ducts, there may be a case where the layout of the engine room is limited, such as when there is no room in the engine room. There is a possibility that a problem that it is difficult to arrange the inside of the inside may occur.
The present invention has been made paying attention to the above problems, and by generating a plurality of resonance frequencies without requiring a plurality of intake ducts, it is possible to generate a powerful intake sound. In addition, an object of the present invention is to provide an intake sound enhancement device capable of improving the degree of freedom of layout.

In order to solve the above-described problems, the present invention provides a communication pipe that is attached to an outer peripheral surface of an intake duct that forms an intake passage to an engine and communicates with the intake duct, closes the communication pipe, and is configured to reduce intake negative pressure. In an intake sound emphasizing device comprising: an elastic film member that vibrates in an out-of-plane direction by elastically deforming according to a change,
The elastic membrane member provides an intake sound emphasizing device having at least two elastic membrane components having different resonance frequencies that vibrate in an out-of-plane direction of the elastic membrane member.

  According to the present invention, it is possible to generate a plurality of resonance frequencies without requiring a plurality of intake ducts, thereby generating a powerful intake sound and improving the flexibility of layout.

Embodiments of the present invention will be described below with reference to the drawings.
(First embodiment)
(Constitution)
FIG. 1 is a view showing a vehicle C equipped with an intake sound enhancement device 1 of the present embodiment, FIG. 1 (a) is a view showing the vehicle C viewed from the side, and FIG. FIG. 1C is a diagram illustrating a state in which C is viewed from above, and FIG. 1C is a diagram illustrating a state in which vehicle C is viewed from the front.
As shown in FIG. 1, the intake sound emphasizing device 1 of the present embodiment is provided in the front of the passenger compartment 2 and disposed in the engine compartment 6 separated from the passenger compartment 2 by the dash panel 4. An intake duct 10 communicating with the engine 8 is provided.

FIG. 2 is a diagram showing a configuration of the intake sound enhancement device 1 of the present embodiment.
As shown in FIG. 2, the intake sound enhancement device 1 of the present embodiment includes a communication pipe 12, an additional pipe 14, and an elastic film member 16.
The communication pipe 12 has a cylindrical shape, and is attached to the outer peripheral surface of the intake duct 10 formed by a vent pipe in which gas is present so as to communicate with the intake duct 10.
The additional pipe 14 has a cylindrical shape like the communication pipe 12, and is formed by a pipe longer than the communication pipe 12. One open end of the additional pipe 14 is connected to the communication pipe 12, and the other open end of the additional pipe 14 is open to the outside air.

  The elastic membrane member 16 is formed in a disk shape by an elastic body such as rubber, for example, and is attached to the inner peripheral surface of the communication pipe 12 to close the communication pipe 12. Further, the elastic membrane member 16 vibrates in the out-of-plane direction of the elastic membrane member 16 by elastically deforming in accordance with a change in intake negative pressure generated in the gas in the intake duct 10 in the intake process of the engine 8. The detailed configuration of the elastic film member 16 will be described later.

Hereinafter, the configuration of the intake duct 10 and portions related to the intake duct 10 will be described.
The intake duct 10 forms an intake passage from outside air to the engine 8 and includes a dust side intake duct 18 and a clean side intake duct 20.
One open end of the dust side intake duct 18 is connected to the air cleaner 22, and the other open end of the dust side intake duct 18 is open to the outside air.

The clean side intake duct 20 includes a throttle chamber 24. One open end of the clean side intake duct 20 is connected to the air cleaner 22, and the other open end of the clean side intake duct 20 is connected to the engine 8 via a surge tank 26 and each intake manifold 28 described later. Is connected to each cylinder (not shown).
The air cleaner 22 has a filter part such as an oil filter, for example, and cleans the gas flowing in from the other opening end of the intake duct 10 by passing through the filter part.

  The throttle chamber 24 is attached between the air cleaner 22 and the surge tank 26 and is connected to an accelerator pedal (not shown). The amount of air flow from the air cleaner 22 to the surge tank 26 according to the amount of depression of the accelerator pedal. Increase or decrease. When the amount of depression of the accelerator pedal is reduced to reduce the amount of ventilation from the air cleaner 22 to the surge tank 26, the rotational speed of the engine 8 is reduced and the intake negative pressure generated in the gas in the intake duct 10 is reduced. . Further, when the amount of depression of the accelerator pedal is increased and the amount of ventilation from the air cleaner 22 to the surge tank 26 is increased, the rotational speed of the engine 8 is increased and the intake negative pressure generated in the gas in the intake duct 10 is increased. To increase.

In the intake process, the engine 8 flows gas from the other opening end of the dust side intake duct 18 into the clean side intake duct 20 through each surge cylinder 26 and each intake manifold 28 to each cylinder. Inhale in.
Further, the engine 8 forms a pressure source for generating an intake pulsation in the gas existing in the clean side intake duct 20 in accordance with the intake operation, and the intake pulsation constitutes an intake sound.

  Here, the intake air pulsation generated with the intake operation of the engine 8 is a pressure fluctuation generated in the gas existing in the clean side intake duct 20, and this pressure fluctuation is composed of pressure fluctuations of a plurality of frequencies. ing. That is, the intake pulsation generated in association with the intake operation of the engine 8 is composed of intake pulsations having a plurality of frequencies. In the present embodiment, an in-line six-cylinder engine having six cylinders will be described as an example of the engine 8, but the configuration of the engine 8 is not limited to this.

FIG. 3 is a diagram showing a detailed configuration of the elastic membrane member 16.
The elastic membrane member 16 has three elastic membrane constituent portions 30 a to 30 c when viewed from the thickness direction of the elastic membrane member 16, and each elastic membrane constituent portion 30 a to 30 c is an intake duct of the elastic membrane member 16. It is divided by the grooves 32 provided on the side surface, and is formed into shapes having different areas. Specifically, the area Sa of the elastic membrane component 30a is larger than the area Sb of the elastic membrane component 30b, and the area Sb of the elastic membrane component 30b is larger than the area Sc of the elastic membrane component 30c. Is formed. That is, each elastic membrane component 30a-30c is formed so that the conditional expression of Sa>Sb> Sc is satisfied.

  Here, since each elastic film component 30a-30c has a mutually different area, the resonance frequency which vibrates to the out-of-plane direction of the elastic film member 16 mutually differs. In addition, the elastic membrane constituting part 30 having a large area has a lower resonance frequency that causes vibration in the out-of-plane direction, compared to the elastic film constituting part 30 having a small area. Therefore, each elastic membrane component 30a-30c has a resonance frequency of the elastic membrane component 30a as the first resonance frequency f1, a resonance frequency of the elastic membrane component 30b as the second resonance frequency f2, and a resonance frequency of the elastic membrane component 30c. Is set so that the conditional expression f1 <f2 <f3 is satisfied.

  In addition, each of the elastic film constituting units 30a to 30c has an intake pulsation of a first frequency selected from among a plurality of intake pulsations whose resonance frequencies constitute an intake pulsation generated in accordance with an intake operation of the engine 8. In addition, it is formed in a shape that matches each frequency of the intake pulsation of the second frequency and the intake pulsation of the third frequency. Specifically, the first resonance frequency f1 of the elastic membrane component 30a matches the intake pulsation frequency of the first frequency, and the second resonance frequency f2 of the elastic membrane component 30b is the intake air of the second frequency. It matches the frequency of pulsation. In addition, the third resonance frequency f3 of the elastic membrane constituting part 30c matches the frequency of the intake pulsation of the third frequency.

Here, the first frequency is a frequency lower than the second frequency, and the second frequency is a frequency lower than the third frequency. In other words, the first frequency, the second frequency, and the third frequency have a relationship that satisfies the condition of the first frequency <the second frequency <the third frequency.
The first frequency is a frequency that constitutes an intake pulsation that occurs when the engine speed is a predetermined speed R1, and the second frequency is an engine speed that is a predetermined speed R2. The frequency constituting the intake pulsation that occurs in a certain case, the third frequency, is the frequency constituting the intake pulsation that occurs when the engine speed is the predetermined speed R3.

Here, R1 is a rotational speed lower than R2, and R2 is a rotational speed lower than R3. That is, the rotational speeds R1, R2, and R3 have a relationship that satisfies the conditional expression of R1 <R2 <R3.
The groove 32 as described above is formed between two adjacent elastic membrane constituent portions 30 and constitutes a stiffness changing portion having a stiffness different from those of the elastic membrane constituent portions 30.

(Operation)
Next, the operation of the intake sound enhancement device 1 will be described.
When the engine 8 is driven, the intake pulsation generated by the intake operation of the engine 8 is propagated to the gas existing in the clean side intake duct 20 via each intake manifold 28 and the surge tank 26 (FIG. 2). reference).
When the engine 8 is driven and the amount of depression of the accelerator pedal is increased to increase the air flow from the air cleaner 22 to the surge tank 26 (hereinafter referred to as acceleration), the engine 8 speed increases. In addition, the intake negative pressure generated in the gas in the intake duct 10 increases (see FIG. 2).

Here, with reference to FIG. 4 to FIG. 6, the operation of each elastic membrane constituting portion 30 a to 30 c during acceleration will be described in detail.
4 to 6 are views showing a state in which each elastic membrane constituting portion 30a to 30c vibrates in the out-of-plane direction of the elastic membrane member during acceleration. 4 shows a state where the engine speed is R1, FIG. 5 shows a state where the engine speed is R2, and FIG. 6 shows a state where the engine speed is R3.
In the state where the engine speed is R1, among the intake pulsations of the plurality of frequencies constituting the intake pulsation generated in accordance with the intake operation of the engine, the intake pulsation of the first frequency is an elastic film member via the communication pipe. Propagated to.

  At this time, the frequency of the intake pulsation of the first frequency coincides with the first resonance frequency f1 of the elastic membrane constituting portion 30a, and therefore, among the elastic membrane constituting portions 30a to 30c, as shown in FIG. Only the elastic membrane component 30a vibrates in the out-of-plane direction of the elastic membrane member. When the elastic membrane component 30a vibrates in the out-of-plane direction of the elastic membrane member, the intake air pulsation near the first frequency and the first frequency is amplified, so that the increased intake sound from the other opening end of the additional pipe Is emitted to the outside air side.

In a state where the amount of depression of the accelerator pedal is further increased, that is, in a state where the engine speed is R2, the second of the intake pulsations of a plurality of frequencies constituting the intake pulsation generated by the intake operation of the engine. The intake pulsation of the frequency is propagated to the elastic membrane member through the communication pipe.
At this time, since the frequency of the intake pulsation of the second frequency coincides with the second resonance frequency f2 of the elastic membrane constituting portion 30b, as shown in FIG. 5, among the elastic membrane constituting portions 30a to 30c, Only the elastic membrane component 30b vibrates in the out-of-plane direction of the elastic membrane member. When the elastic membrane component 30b vibrates in the out-of-plane direction of the elastic membrane member, the intake air pulsation near the second frequency and the second frequency is amplified, so that the increased intake sound from the other opening end of the additional pipe Is emitted to the outside air side.

In a state where the amount of depression of the accelerator pedal is further increased, that is, in a state where the engine speed is R3, a third of the intake pulsations of a plurality of frequencies constituting the intake pulsation generated in association with the intake operation of the engine. The intake pulsation of the frequency is propagated to the elastic membrane member through the communication pipe.
At this time, since the frequency of the intake pulsation of the third frequency matches the third resonance frequency f3 of the elastic membrane constituting portion 30c, as shown in FIG. 6, among the elastic membrane constituting portions 30a to 30c, Only the elastic membrane component 30c vibrates in the out-of-plane direction of the elastic membrane member. When the elastic membrane component 30c vibrates in the out-of-plane direction of the elastic membrane member, the third frequency and the intake pulsation in the vicinity of the third frequency are amplified. Therefore, the increased intake sound from the other opening end of the additional pipe Is emitted to the outside air side.

Therefore, at the time of acceleration, the elastic film constituent parts 30a to 30c having different resonance frequencies respectively vibrate in the out-of-plane direction of the elastic film member in accordance with the change in the engine speed. For this reason, the intake pulsation of the first frequency, the intake pulsation of the second frequency, and the intake pulsation of the third frequency are amplified, and the increased intake sound is radiated from the other open end of the additional pipe 14 to the outside air side. (See FIG. 2).
When the intake sound increased from the other opening end of the additional pipe 14 is radiated to the outside air side, the radiated intake sound is propagated into the vehicle compartment 2 via the dash panel 4, and thus a sense of force The intake sound with the noise is introduced into the passenger compartment 2 (see FIG. 1).

(Application examples)
In addition, in the intake sound emphasizing device 1 of the present embodiment, the three elastic film constituting units 30a to 30c have different resonance frequencies that vibrate in the out-of-plane direction of the elastic film member. It is not limited. In other words, it is only necessary that at least two of the three elastic film constituent parts 30a to 30c have different resonance frequencies that vibrate in the out-of-plane direction of the elastic film member.

  Further, in the inspiratory sound emphasizing device 1 of the present embodiment, the three elastic film constituting portions 30a to 30c are formed in different areas, respectively, so that the resonance frequencies that vibrate in the out-of-plane direction of the elastic film member are different from each other. However, the present invention is not limited to this. That is, for example, the three elastic membrane constituent portions 30a to 30c are formed in the same area, and at least one of rigidity and mass is different from each other, thereby vibrating in the out-of-plane direction of the elastic membrane member. The resonance frequencies may be different from each other. Here, for example, in the elastic membrane constituent part 30 that improves at least one of rigidity and mass, the thickness of the elastic membrane constituent part 30 is increased, such as the arrangement of the core material inside and the processing of rib formation. Accordingly, at least one of rigidity and mass is improved even if it has the same area as that of the other elastic membrane constituting part 30. In this case, by setting at least one of the rigidity and mass of each elastic membrane component so as to satisfy the condition corresponding to the resonance frequency that vibrates in the out-of-plane direction of the elastic membrane member, Can be set to a desired resonance frequency.

Moreover, in the inspiratory sound emphasizing device 1 of the present embodiment, the elastic film member 16 is configured to have the three elastic film components 30a to 30c, but is not limited thereto, and the elastic film member 16 is It is good also as a structure which has the two elastic film | membrane structure parts 30. FIG.
Further, in the intake sound enhancement device 1 of the present embodiment, the intake sound enhancement device 1 is arranged in the engine room 6 provided in front of the vehicle compartment 2. The place to arrange is not limited to this. That is, for example, when the configuration of the vehicle C is a configuration in which the engine room 6 is provided behind the vehicle compartment 2, the place where the intake sound enhancement device 1 is disposed is provided behind the vehicle compartment 2. It may be arranged in the engine room 6. For example, when the configuration of the vehicle C is a configuration in which the engine room 6 is provided below the vehicle compartment 2, the place where the intake sound enhancement device 1 is disposed is provided below the vehicle compartment 2. It may be arranged in the engine room 6. In short, the place where the intake sound enhancement device 1 is arranged can be changed as appropriate according to the configuration of the vehicle C, specifically, the position of the engine room 6.

(Effects of the first embodiment)
(1) In the inspiratory sound emphasizing device of the present embodiment, the elastic film member is configured to have three elastic film components when viewed from the thickness direction of the elastic film member, and each elastic film component is The resonance frequencies that vibrate in the out-of-plane direction of the elastic membrane member are different from each other.
For this reason, at the time of acceleration, each elastic membrane component vibrates in the out-of-plane direction of the elastic membrane member in accordance with a change in the engine speed.
Accordingly, the intake pulsation of the first frequency, the second frequency, and the third frequency are amplified according to the change in the engine speed, and the increased intake sound is generated from the other open end of the additional pipe. Radiated to the outside air side. Since the radiated intake sound is propagated into the vehicle interior via the dash panel, a powerful intake sound is introduced into the vehicle interior.

  As a result, it is possible to generate intake sound having a plurality of resonance frequencies by one elastic film member, and it is possible to generate a powerful intake sound without requiring a plurality of intake ducts. In addition, since the configuration does not require a plurality of intake ducts, it is possible to improve the degree of freedom of layout, and it can be applied to many types of vehicles having different configurations such as vehicles having different body sizes.

(2) Moreover, in the inspiratory sound emphasizing device of the present embodiment, the elastic film member is configured to have three elastic film components when viewed from the thickness direction of the elastic film member, and each elastic film component has an area Are formed in different shapes, so that the resonance frequencies that vibrate in the out-of-plane direction of the elastic membrane member are different from each other.
Therefore, by setting the area of each elastic membrane component to be the area corresponding to the resonance frequency that vibrates in the out-of-plane direction of the elastic membrane member, the resonance frequency of each elastic membrane component is set to a desired value. The resonance frequency can be set.
As a result, the resonance frequency at which each elastic membrane component vibrates in the out-of-plane direction of the elastic membrane member can be set to a plurality of desired frequencies, and the frequency band range in which the intake sound can be emphasized can be expanded. Therefore, it is possible to improve the quality of the intake sound introduced into the vehicle interior.

(Second embodiment)
(Constitution)
Next, a second embodiment of the present invention will be described.
FIG. 7 is a diagram illustrating the configuration of the intake sound enhancement device of the present embodiment, and is a diagram illustrating the configuration of the elastic film member 16.
As shown in FIG. 7, the configuration of the intake sound emphasizing device of the present embodiment is the same as that of the first embodiment described above except for the configuration of the elastic film member 16. In other words, the elastic membrane member 16 of the present embodiment is formed between two adjacent elastic membrane constituent portions 30 and is divided by a stiffness changing portion 34 having a rigidity different from those of the elastic membrane constituent portions 30. When viewed from the thickness direction of the member 16, it has four elastic film constituting portions 30 a to 30 d.

The stiffness changing portion 34 includes a circular stiffness changing portion 36 and a radial stiffness changing portion 38.
The circular stiffness changing portion 36 is configured by a groove provided on the surface of the elastic membrane member 16 on the intake duct side, and is formed in a shape surrounding the portion of the elastic membrane member 16 including the center of the elastic membrane member 16. As a whole, it has a perfect circular shape or an elliptical shape. In the present embodiment, the portion surrounded by the circular stiffness changing portion 36 will be described as an elastic membrane constituting portion 30d.

  Similarly to the circular stiffness changing portion 36, the radial stiffness changing portion 38 is configured by a groove provided on the surface of the elastic membrane member 16 on the intake duct side, and the outer peripheral portion of the elastic membrane member 16 from the circular stiffness changing portion 36. The portion other than the portion surrounded by the circular stiffness changing portion 36 is divided into a plurality of portions. In the present embodiment, the radial stiffness changing portion 38 includes three radial stiffness changing portions 38a to 38c extending from the circular stiffness changing portion 36 toward the outer peripheral portion of the elastic membrane member 16, respectively. An example will be described. In the present embodiment, the three elastic membrane constituent portions 30 divided by the three radial stiffness changing portions 38a to 38c will be described as elastic membrane constituent portions 30a to 30c, respectively.

  The elastic membrane constituting portions 30a to 30d are formed in shapes having different areas by the rigidity changing portion 34. Specifically, the area Sa of the elastic membrane component 30a is larger than the area Sb of the elastic membrane component 30b, the area Sb of the elastic membrane component 30b is larger than the area Sc of the elastic membrane component 30c, and is elastic. The area Sc of the film constituent part 30c is formed to be larger than the area Sd of the elastic film constituent part 30d. In other words, the elastic film constituting portions 30a to 30d are formed so that the conditional expression Sa> Sb> Sc> Sd is satisfied.

  Further, since the elastic film constituent parts 30 a to 30 d have different areas, the resonance frequencies that vibrate in the out-of-plane direction of the elastic film member 16 are different from each other. Specifically, the resonance frequency of the elastic membrane component 30a is the first resonance frequency f1, the resonance frequency of the elastic membrane component 30b is the second resonance frequency f2, and the resonance frequency of the elastic membrane component 30c is the third resonance frequency f3. When the resonance frequency of the elastic membrane constituting part 30d is the fourth resonance frequency f4, the elastic film forming unit 30d is formed so that the conditional expression f1 <f2 <f3 <f4 is satisfied.

  In addition, each of the elastic film constituting units 30a to 30d has an intake pulsation of a first frequency selected from among a plurality of intake pulsations whose resonance frequencies constitute an intake pulsation generated in accordance with an intake operation of the engine 8. , The second frequency of intake pulsation, the third frequency of intake pulsation, and the fourth frequency of intake pulsation. Specifically, the first resonance frequency f1 of the elastic membrane component 30a matches the intake pulsation frequency of the first frequency, and the second resonance frequency f2 of the elastic membrane component 30b is the intake air of the second frequency. It matches the frequency of pulsation. Further, the third resonance frequency f3 of the elastic membrane constituting portion 30c matches the frequency of the intake pulsation of the third frequency, and the fourth resonance frequency f4 of the elastic membrane constituting portion 30d is the frequency of the intake pulsation of the fourth frequency. Is consistent with

  Here, the first frequency is a frequency lower than the second frequency, the second frequency is a frequency lower than the third frequency, and the third frequency is a frequency lower than the fourth frequency. That is, the first frequency, the second frequency, the third frequency, and the fourth frequency are in a relationship that satisfies the following condition: first frequency <second frequency <third frequency <fourth frequency.

The first frequency is a frequency that constitutes an intake pulsation that occurs when the engine speed is a predetermined speed R1, and the second frequency is an engine speed that is a predetermined speed R2. This is the frequency that constitutes the intake pulsation that occurs in some cases. The third frequency is a frequency that constitutes an intake pulsation that occurs when the engine speed is the predetermined speed R3, and the fourth frequency is the engine speed that is the predetermined speed. This is the frequency constituting the intake pulsation that occurs when R4.
Here, R1 is a rotational speed lower than R2, R2 is a rotational speed lower than R3, and R3 is a rotational speed lower than R4. That is, the rotational speeds R1, R2, R3, and R4 have a relationship that satisfies the conditional expression of R1 <R2 <R3 <R4.
Other configurations are the same as those of the first embodiment described above.

(Operation)
Next, the operation of the intake sound enhancement device 1 of the present embodiment will be described. In the following description, since the configuration other than the elastic film member 16 is the same as that of the first embodiment described above, the operation of different parts will be mainly described.
When the engine 8 is driven, the intake pulsation generated by the intake operation of the engine 8 is propagated to the gas existing in the clean side intake duct 20 via each intake manifold 28 and the surge tank 26 (FIG. 2). reference).
When the engine 8 is driven and the amount of depression of the accelerator pedal is increased to increase the air flow from the air cleaner 22 to the surge tank 26 (hereinafter referred to as acceleration), the engine 8 speed increases. In addition, the intake negative pressure generated in the gas in the intake duct 10 increases (see FIG. 2).

At the time of acceleration, in the state where the engine speed is R1, the intake pulsation of the first frequency among the intake pulsations of the plurality of frequencies constituting the intake pulsation generated in accordance with the intake operation of the engine passes through the communication pipe. Is transmitted to the elastic membrane member.
At this time, since the frequency of the intake air pulsation of the first frequency matches the first resonance frequency f1 of the elastic membrane component 30a, only the elastic membrane component 30a among the elastic membrane components 30a to 30d is Vibrates in the out-of-plane direction of the elastic membrane member. When the elastic membrane component 30a vibrates in the out-of-plane direction of the elastic membrane member, the intake air pulsation near the first frequency and the first frequency is amplified, so that the increased intake sound from the other opening end of the additional pipe Is emitted to the outside air side.

In a state where the amount of depression of the accelerator pedal is further increased, that is, in a state where the engine speed is R2, the second of the intake pulsations of a plurality of frequencies constituting the intake pulsation generated by the intake operation of the engine. The intake pulsation of the frequency is propagated to the elastic membrane member through the communication pipe.
At this time, since the frequency of the intake pulsation of the second frequency coincides with the second resonance frequency f2 of the elastic membrane constituent portion 30b, only the elastic membrane constituent portion 30b among the elastic membrane constituent portions 30a to 30d is Vibrates in the out-of-plane direction of the elastic membrane member. When the elastic membrane component 30b vibrates in the out-of-plane direction of the elastic membrane member, the intake air pulsation near the second frequency and the second frequency is amplified, so that the increased intake sound from the other opening end of the additional pipe Is emitted to the outside air side.

In a state where the amount of depression of the accelerator pedal is further increased, that is, in a state where the engine speed is R3, a third of the intake pulsations of a plurality of frequencies constituting the intake pulsation generated in association with the intake operation of the engine. The intake pulsation of the frequency is propagated to the elastic membrane member through the communication pipe.
At this time, since the frequency of the intake pulsation of the third frequency matches the third resonance frequency f3 of the elastic membrane component 30c, only the elastic membrane component 30c among the elastic membrane components 30a to 30d is Vibrates in the out-of-plane direction of the elastic membrane member. When the elastic membrane component 30c vibrates in the out-of-plane direction of the elastic membrane member, the third frequency and the intake pulsation in the vicinity of the third frequency are amplified. Therefore, the increased intake sound from the other opening end of the additional pipe Is emitted to the outside air side.

In a state where the amount of depression of the accelerator pedal is further increased, that is, in a state where the engine speed is R4, the fourth of the intake pulsations of a plurality of frequencies constituting the intake pulsation that occurs along with the intake operation of the engine. The intake pulsation of the frequency is propagated to the elastic membrane member through the communication pipe.
At this time, since the frequency of the intake pulsation of the fourth frequency coincides with the fourth resonance frequency f4 of the elastic membrane constituting portion 30d, only the elastic membrane constituting portion 30d among the elastic membrane constituting portions 30a to 30d is Vibrates in the out-of-plane direction of the elastic membrane member. When the elastic membrane component 30d vibrates in the out-of-plane direction of the elastic membrane member, the fourth frequency and the intake pulsation in the vicinity of the fourth frequency are amplified. Therefore, the increased intake sound from the other opening end of the additional pipe Is emitted to the outside air side.

Therefore, at the time of acceleration, the elastic membrane constituent portions 30a to 30d having different resonance frequencies vibrate in the out-of-plane direction of the elastic membrane member in accordance with changes in the engine speed. For this reason, the intake pulsation of the first frequency, the intake pulsation of the second frequency, the intake pulsation of the third frequency, and the intake pulsation of the fourth frequency are amplified, and the intake air increased in sound from the other opening end of the additional pipe 14. Sound is emitted to the outside air side (see FIG. 2).
When the intake sound increased from the other opening end of the additional pipe 14 is radiated to the outside air side, the radiated intake sound is propagated into the vehicle compartment 2 via the dash panel 4, and thus a sense of force The intake sound with the noise is introduced into the passenger compartment 2 (see FIG. 1).

(Application examples)
In the inspiratory sound emphasizing device 1 of the present embodiment, the elastic film member 16 is configured to have the four elastic film components 30a to 30d when viewed from the thickness direction of the elastic film member 16, but the present invention is not limited thereto. Is not to be done. That is, the elastic membrane member 16 may have a configuration having five or more elastic membrane constituent portions 30 when viewed from the thickness direction of the elastic membrane member 16. In this case, when the elastic film member 16 is viewed from the thickness direction of the elastic film member 16, the elastic film member 16 can correspond to a wider range of frequencies as compared with the case where the elastic film member 16 includes four elastic film components 30 a to 30 d. It becomes possible.

(Effect of the second embodiment)
(1) In the inspiratory sound emphasizing device of the present embodiment, the elastic membrane member has four elastic membrane constituent portions as viewed from the thickness direction of the elastic membrane member, and each elastic membrane constituent portion has an area of By forming them in different shapes, the resonance frequencies that vibrate in the out-of-plane direction of the elastic film member are different from each other.
Therefore, by setting the area of each elastic membrane component to be the area corresponding to the resonance frequency that vibrates in the out-of-plane direction of the elastic membrane member, the resonance frequency of each elastic membrane component is set to a desired value. The resonance frequency can be set.
As a result, the intake sound enhancement device according to the first embodiment described above, i.e., the elastic membrane member has three elastic membrane components as viewed from the thickness direction of the elastic membrane member and is compared with the intake sound enhancement device. Thus, the range of the frequency band in which the intake sound can be emphasized can be further expanded, so that the quality of the intake sound introduced into the vehicle compartment can be improved.

(Third embodiment)
(Constitution)
Next, a third embodiment of the present invention will be described.
8 and 9 are diagrams showing the configuration of the intake sound enhancement device 1 according to the present embodiment, FIG. 8 is a diagram showing the configuration of the elastic membrane member 16, and FIG. 9 is a cross-sectional view taken along the line XX of FIG. FIG.
As shown in FIGS. 8 and 9, the configuration of the intake sound enhancement device 1 of the present embodiment is the same as that of the first embodiment described above except for the configuration of the elastic film member 16. That is, in the elastic membrane member 16 of the present embodiment, the rigidity changing portion is configured by the convex portion 40 provided on the surface of the elastic membrane member 16 on the intake duct side.

The convex portion 40 has a V-shape that protrudes toward the intake duct as viewed from the radial direction of the elastic film member 16. Moreover, the thickness of the part in which the convex part 40 is provided among the elastic film members 16 is formed in the same thickness as another part. That is, the thickness of the elastic membrane member 16 is uniform as a whole. The elastic membrane member 16 provided with such convex portions 40 is formed by, for example, integral molding using a mold.
Other configurations are the same as those of the first embodiment described above.

(Operation)
Next, the operation of the intake sound enhancement device 1 of the present embodiment will be described. In the following description, since the configuration other than the elastic film member 16 is the same as that of the first embodiment described above, the operation of different parts will be mainly described.
When the engine 8 is driven, the intake pulsation generated by the intake operation of the engine 8 is propagated to the gas existing in the clean side intake duct 20 via each intake manifold 28 and the surge tank 26 (FIG. 2). reference).
When the engine 8 is driven and the amount of depression of the accelerator pedal is increased to increase the air flow from the air cleaner 22 to the surge tank 26 (hereinafter referred to as acceleration), the engine 8 speed increases. In addition, the intake negative pressure generated in the gas in the intake duct 10 increases (see FIG. 2).

When accelerating, the amount of depression of the accelerator pedal is changed and the engine speed changes, so that the elastic film constituent parts 30a to 30c having different resonance frequencies are respectively elastic film members according to the change in the engine speed. Will vibrate in the out-of-plane direction. For this reason, the intake pulsation of the first frequency, the intake pulsation of the second frequency, and the intake pulsation of the third frequency are amplified, and the increased intake sound is radiated from the other open end of the additional pipe 14 to the outside air side. (See FIG. 2).
When the intake sound increased from the other opening end of the additional pipe 14 is radiated to the outside air side, the radiated intake sound is propagated into the vehicle compartment 2 via the dash panel 4, and thus a sense of force The intake sound with the noise is introduced into the passenger compartment 2 (see FIG. 1).

(Application examples)
In the intake sound emphasizing device 1 of the present embodiment, the convex portion 40 provided on the elastic membrane member 16 has a V-shape that protrudes toward the intake duct when viewed from the radial direction of the elastic membrane member 16, and the elastic membrane member. Although the thickness of 16 is formed into a uniform shape as a whole, the present invention is not limited to this. That is, for example, as shown in FIG. 10A, the elastic film member 16 may have a configuration in which the thickness of the portion where the convex portion 40 is provided is thicker than the other portions. Further, for example, as shown in FIG. 10B, the convex portion 40 is U-shaped when viewed from the radial direction of the elastic membrane member 16, and the thickness of the elastic membrane member 16 is uniform as a whole. You may form in. Further, for example, as shown in FIG. 10C, the convex portion 40 has a U-shape projecting toward the intake duct side when viewed from the radial direction of the elastic membrane member 16, and the convex portion of the elastic membrane member 16 is formed. It is good also as a structure where the thickness of the part in which 40 is provided is thicker than another part.

  Further, in the intake sound emphasizing device 1 of the present embodiment, the rigidity changing portion is configured by the convex portion 40 provided on the surface of the elastic film member 16 on the intake duct side, but is not limited thereto. That is, for example, as shown in FIGS. 11 (a) and 11 (c), the rigidity changing portion may be constituted by a recess 42 provided on the surface of the elastic membrane member 16 on the intake duct side. As shown in (d), the rigidity changing portion may be constituted by a convex portion 40 provided on the surface of the elastic membrane member 16 on the outside air side.

(Effect of the third embodiment)
(1) In the intake sound emphasizing device of the present embodiment, the rigidity changing portion that divides the elastic membrane member into a plurality of elastic membrane constituent portions is configured by the convex portion provided on the surface of the elastic membrane member on the intake duct side. Therefore, the elastic film member can be configured to have a plurality of elastic film components by a simple structure.
As a result, it is possible to prevent an increase in the manufacturing cost of the elastic membrane member, and thus it is possible to prevent an increase in the manufacturing cost of the intake sound enhancement device, and it is possible to improve the productivity of the intake sound enhancement device. Become.

(Fourth embodiment)
(Constitution)
Next, a fourth embodiment of the present invention will be described.
12 and 13 are diagrams showing the configuration of the intake sound enhancement device 1 of the present embodiment, FIG. 12 is a diagram showing the configuration of the elastic membrane member 16, and FIG. 13 is a cross-sectional view taken along the line YY in FIG. FIG.
As shown in FIGS. 12 and 13, the configuration of the intake sound enhancement device 1 of the present embodiment is the same as that of the first embodiment described above except for the configuration of the elastic film member 16. That is, in the elastic membrane member 16 of the present embodiment, the rigidity changing portion is configured by the convex portion 40 provided on the surface of the elastic membrane member 16 on the intake duct side, and the convex portion 40 has the core material 44. is doing.

The convex portion 40 has a V-shape that protrudes toward the intake duct as viewed from the radial direction of the elastic film member 16. Moreover, the thickness of the part in which the convex part 40 is provided among the elastic film members 16 is formed in the same thickness as another part. That is, the thickness of the elastic membrane member 16 is uniform as a whole.
The core member 44 is formed of a linear material having rigidity higher than that of the elastic film member 16 such as a wire, and is disposed on the surface of the elastic film member 16 on the outside air side.
Other configurations are the same as those of the first embodiment described above.

(Operation)
Next, the operation of the intake sound enhancement device 1 of the present embodiment will be described. In the following description, since the configuration other than the elastic film member 16 is the same as that of the first embodiment described above, the operation of different parts will be mainly described.
When the engine 8 is driven, the intake pulsation generated by the intake operation of the engine 8 is propagated to the gas existing in the clean side intake duct 20 via each intake manifold 28 and the surge tank 26 (FIG. 2). reference).
When the engine 8 is driven and the amount of depression of the accelerator pedal is increased to increase the air flow from the air cleaner 22 to the surge tank 26 (hereinafter referred to as acceleration), the engine 8 speed increases. In addition, the intake negative pressure generated in the gas in the intake duct 10 increases (see FIG. 2).

When accelerating, the amount of depression of the accelerator pedal is changed and the engine speed changes, so that the elastic film constituent parts 30a to 30c having different resonance frequencies are respectively elastic film members according to the change in the engine speed. Will vibrate in the out-of-plane direction. For this reason, the intake pulsation of the first frequency, the intake pulsation of the second frequency, and the intake pulsation of the third frequency are amplified, and the increased intake sound is radiated from the other open end of the additional pipe 14 to the outside air side. (See FIG. 2).
When the intake sound increased from the other opening end of the additional pipe 14 is radiated to the outside air side, the radiated intake sound is propagated into the vehicle compartment 2 via the dash panel 4, and thus a sense of force The intake sound with the noise is introduced into the passenger compartment 2 (see FIG. 1).

(Application examples)
In the intake sound emphasizing device 1 of the present embodiment, the convex portion 40 provided on the elastic film member 16 is formed in a V shape that protrudes toward the intake duct as viewed from the radial direction of the elastic film member 16, and the elastic film The member 16 is formed in a uniform shape as a whole, and the core member 44 is disposed on the surface of the elastic membrane member 16 on the outside air side. However, the present invention is not limited to this. . That is, for example, as shown in FIG. 14A, the thickness of the portion of the elastic film member 16 where the convex portion 40 is provided is thicker than the other portions, and the core member 44 is Further, the elastic film member 16 may be configured to be disposed inside a portion where the convex portion 40 is provided. Further, for example, as shown in FIG. 14B, the convex portion 40 may be formed in a U shape that protrudes toward the intake duct as viewed from the radial direction of the elastic membrane member 16. Further, for example, as shown in FIG. 14 (c), the convex portion 40 is formed in a U-shape that protrudes toward the intake duct side when viewed from the radial direction of the elastic membrane member 16. As a configuration in which the thickness of the portion where the portion 40 is provided is thicker than the other portions, the core member 44 is disposed inside the portion of the elastic film member 16 where the convex portion 40 is provided. It is good also as composition which has.

  Further, in the intake sound emphasizing device 1 of the present embodiment, the rigidity changing portion is configured by the convex portion 40 provided on the surface of the elastic film member 16 on the intake duct side, but is not limited thereto. That is, for example, as shown in FIGS. 15 (a) and 15 (c), the rigidity changing portion may be constituted by a recess 42 provided on the surface of the elastic membrane member 16 on the intake duct side. As shown in (d), the rigidity changing portion may be constituted by a convex portion 40 provided on the surface of the elastic membrane member 16 on the outside air side.

(Effect of the fourth embodiment)
(1) In the intake sound emphasizing device of the present embodiment, the convex portion provided on the surface of the elastic membrane member on the intake duct side constitutes a rigidity changing portion that divides the elastic membrane member into a plurality of elastic membrane constituent portions. The convex portion has a core material.
Therefore, with a simple structure, the elastic film member can be configured to have a plurality of elastic film components, and the strength of the protrusions can be improved.
As a result, the productivity of the intake sound enhancement device can be improved, and the strength of the elastic film member can be improved as compared with the intake sound enhancement device of the third embodiment described above. The durability of the elastic membrane member can be improved.

(Fifth embodiment)
(Constitution)
Next, a fifth embodiment of the present invention will be described.
FIG. 16 is a diagram illustrating a configuration of the intake sound enhancement device 1 according to the present embodiment, and is a diagram illustrating a configuration of the elastic film member 16.
As shown in FIG. 16, the configuration of the intake sound enhancement device 1 of the present embodiment is the same as that of the first embodiment described above except for the configuration of the elastic film member 16. That is, in the elastic film member 16 of the present embodiment, the elastic film components 30a to 30c are formed of materials having different stiffnesses. Specifically, the stiffness Ra of the elastic membrane component 30a is lower than the stiffness Rb of the elastic membrane component 30b, and the stiffness Rb of the elastic membrane component 30b is lower than the stiffness Rc of the elastic membrane component 30c. Is formed. That is, each elastic membrane component 30a-30c is formed so that the conditional expression of Ra>Rb> Rc is satisfied.

  Here, since each elastic film | membrane structure part 30a-30c has mutually different rigidity, the resonant frequency which vibrates to the out-of-plane direction of the elastic film member 16 mutually differs. In addition, the elastic membrane constituent unit 30 having high rigidity has a lower resonance frequency that causes vibration in the out-of-plane direction compared to the elastic membrane constituent unit 30 having low rigidity. Therefore, each elastic membrane component 30a-30c has a resonance frequency of the elastic membrane component 30a as the first resonance frequency f1, a resonance frequency of the elastic membrane component 30b as the second resonance frequency f2, and a resonance frequency of the elastic membrane component 30c. Is set so that the conditional expression f1 <f2 <f3 is satisfied.

In the elastic membrane member 16 of the present embodiment, the elastic membrane constituent portions 30a to 30c are formed of materials having different rigidity, so that rigidity such as a groove is formed on the surface of the elastic membrane member 16 on the intake duct side. It is the structure which has the elastic membrane structure parts 30a-30c divided | segmented into three, without providing a change part.
Other configurations are the same as those of the first embodiment described above.

(Operation)
Next, the operation of the intake sound enhancement device 1 of the present embodiment will be described. In the following description, since the configuration other than the elastic film member 16 is the same as that of the first embodiment described above, the operation of different parts will be mainly described.
When the engine 8 is driven, the intake pulsation generated by the intake operation of the engine 8 is propagated to the gas existing in the clean side intake duct 20 via each intake manifold 28 and the surge tank 26 (FIG. 2). reference).
When the engine 8 is driven and the amount of depression of the accelerator pedal is increased to increase the air flow from the air cleaner 22 to the surge tank 26 (hereinafter referred to as acceleration), the engine 8 speed increases. In addition, the intake negative pressure generated in the gas in the intake duct 10 increases (see FIG. 2).

At this time, since each elastic film component 30a-30c has mutually different rigidity, the resonance frequency which vibrates to the out-of-plane direction of the elastic film member 16 mutually differs.
For this reason, at the time of acceleration, when the amount of depression of the accelerator pedal is changed and the engine speed is changed, each elastic film constituting unit 30a to 30c is changed to the elastic film member according to the change in the engine speed. It will vibrate in the out-of-plane direction.

Therefore, the intake pulsation of the first frequency, the intake pulsation of the second frequency, and the intake pulsation of the third frequency are amplified, and the increased intake sound is radiated from the other opening end of the additional pipe 14 to the outside air side. (See FIG. 2).
When the intake sound increased from the other opening end of the additional pipe 14 is radiated to the outside air side, the radiated intake sound is propagated into the vehicle compartment 2 via the dash panel 4, and thus a sense of force The intake sound with the noise is introduced into the passenger compartment 2 (see FIG. 1).

(Application examples)
In addition, in the intake sound emphasizing device 1 of the present embodiment, the elastic film members 16a to 30c are formed of materials having different rigidity, so that the rigidity of the elastic film member 16 is different. Although the resonance frequencies that vibrate outward are different from each other, the present invention is not limited to this. That is, by forming the elastic film constituent portions 30a to 30c from materials having different masses, the respective masses are different from each other, and the resonance frequencies that vibrate in the out-of-plane direction of the elastic film member 16 are different from each other. It is good also as composition which has. The point is that each of the elastic membrane constituent portions 30a to 30c is made of a material having at least one of rigidity and mass different from each other, so that the resonance frequencies that vibrate in the out-of-plane direction of the elastic membrane member 16 are different from each other. What is necessary is just composition.

  Further, in the elastic membrane member 16 of the present embodiment, the elastic membrane constituent portions 30a to 30c are formed of materials having different rigidity from each other, so that a rigidity such as a groove is formed on the surface of the elastic membrane member 16 on the intake duct side. Although it was set as the structure which has the elastic film structure parts 30a-30c divided | segmented into three, without providing a change part, it is not limited to this. That is, the elastic membrane member 16 is divided into three by providing a rigidity changing portion such as a groove on the surface of the elastic membrane member 16 on the intake duct side, for example, as in the first to fourth embodiments described above. It is good also as composition which has elastic membrane constituent parts 30a-30c.

(Effect of the fifth embodiment)
(1) In the inspiratory sound emphasizing device of the present embodiment, the elastic film member is configured to have three elastic film components when viewed from the thickness direction of the elastic film member, and each elastic film component is By adopting a configuration in which the mutual rigidity is different, the resonance frequencies that vibrate in the out-of-plane direction of the elastic film member are different from each other.
For this reason, at the time of acceleration, each elastic membrane component vibrates in the out-of-plane direction of the elastic membrane member in accordance with a change in the engine speed.
Accordingly, the intake pulsation of the first frequency, the second frequency, and the third frequency are amplified according to the change in the engine speed, and the increased intake sound is generated from the other open end of the additional pipe. Radiated to the outside air side. Since the radiated intake sound is propagated into the vehicle interior via the dash panel, a powerful intake sound is introduced into the vehicle interior.

  As a result, it is possible to generate a plurality of resonance frequencies with one elastic membrane member, and it is possible to generate a powerful intake sound without requiring a plurality of intake ducts. In addition, since the configuration does not require a plurality of intake ducts, it is possible to improve the degree of freedom of layout, and it can be applied to many types of vehicles having different configurations such as vehicles having different body sizes.

(2) Moreover, in the inspiratory sound emphasizing device of the present embodiment, the elastic film member is configured to have three elastic film constituent parts when viewed from the thickness direction of the elastic film member, and each elastic film constituent part is By forming them in different shapes, the resonance frequencies that vibrate in the out-of-plane direction of the elastic membrane member are different from each other.
Therefore, by setting the rigidity of each elastic membrane component so as to be in accordance with the resonance frequency that vibrates in the out-of-plane direction of the elastic membrane member, the resonance frequency of each elastic membrane component is set to a desired value. The resonance frequency can be set.
As a result, the resonance frequency at which each elastic membrane component vibrates in the out-of-plane direction of the elastic membrane member can be set to a plurality of desired frequencies, and the frequency band range in which the intake sound can be emphasized can be expanded. Therefore, it is possible to improve the quality of the intake sound introduced into the vehicle interior.

(3) Further, in the intake sound emphasizing device of the present embodiment, the elastic membrane member is formed on the surface of the elastic membrane member on the side of the intake duct by forming each elastic membrane constituent portion with a material having different rigidity. Without having a rigidity changing portion such as a groove, the elastic membrane constituting portion is divided into three parts.
Therefore, the elastic film member has a configuration in which the rigidity changing part having a thickness smaller than that of the other part is not provided at the boundary part between adjacent elastic film constituent parts of the elastic film member, so that the durability of the elastic film member can be improved. It becomes possible.

(Example)
FIG. 17 shows the result of measuring the sound pressure level of the intake sound introduced into the vehicle compartment during acceleration using the intake sound enhancement device of the present invention and the conventional intake sound enhancement device. Note that the vertical axis in FIG. 17 indicates the sound pressure level of the intake sound introduced into the vehicle interior (indicated as “indoor sound pressure level [db]” in the figure). In addition, the horizontal axis of FIG. 17 represents the engine speed during acceleration (indicated as “ENG speed [rpm]” in the figure) and the frequency generated in accordance with the change in engine speed (in the figure). Shows “frequency [Hz]”.

As the inspiratory sound emphasizing apparatus of the present invention example, an inspiratory sound emphasizing apparatus having an elastic film member having the same configuration as that described in the first embodiment of the present invention as shown in FIG. 3 was used.
As an inspiratory sound emphasizing device of a comparative example, an inspiratory sound emphasizing device provided with an elastic film member 16 formed as a single body, such as the elastic film member 16 shown in FIG. 18, was used. Here, the elastic membrane member 16 shown in FIG. 18 is different from that described in the first embodiment of the present invention, and has a configuration that does not have a plurality of elastic membrane constituent portions. The resonance frequency that vibrates outward is the same as a whole.

Next, the result of measuring the sound pressure level of the intake sound introduced into the vehicle compartment during acceleration will be described with reference to FIG. In FIG. 17, the result of measuring the sound pressure level using the conventional intake sound enhancement device is shown by a broken line, and the result of measuring the sound pressure level using the intake sound enhancement device of the present invention is shown by a solid line. Yes.
As shown in FIG. 17, since the conventional intake sound enhancement device has the same resonance frequency as a whole, the sound pressure level of the intake sound introduced into the passenger compartment is particularly emphasized in the vicinity of 370 Hz. At other frequencies, the enhancement effect of the intake sound is reduced compared to the vicinity of 370 Hz.

On the other hand, in the intake sound emphasizing device of the present invention, the sound pressure level of the intake sound introduced into the passenger compartment is particularly emphasized at around 370 Hz, around 450 Hz, and around 590 Hz. Compared with the sound enhancement device, the enhancement effect of the intake sound is improved.
As a result, the intake sound is emphasized over the entire frequency band during acceleration, and the effect of enhancing the intake sound is improved over a wide frequency band as compared with the conventional intake sound enhancement device. In FIG. 17, the range in which the enhancement effect of the increased intake sound by the intake sound enhancement device of the present invention is improved as compared with the conventional intake sound enhancement device is indicated by hatching.
From the above measurement results, it was confirmed that the intake sound emphasizing device of the example of the present invention has a higher effect of enhancing the intake sound compared to the conventional intake sound emphasizing device.

It is a figure which shows the vehicle C carrying the intake sound emphasizing apparatus 1 of this embodiment, FIG. 1 (a) is a figure which shows the state which looked at the vehicle C from the side, FIG.1 (b) shows the vehicle C from upper direction. FIG. 1C is a diagram illustrating a state in which the vehicle C is viewed from the front. It is a figure which shows the structure of the intake sound emphasizing apparatus 1 which concerns on 1st embodiment of this invention. FIG. 3 is a diagram showing a detailed configuration of an elastic membrane member 16. It is a figure which shows the state which each elastic film structure part 30a-30c vibrates to the out-of-plane direction of an elastic film member at the time of acceleration, and is a figure which shows the state whose engine speed is R1. It is a figure which shows the state which each elastic film structure part 30a-30c vibrates to the out-of-plane direction of an elastic film member at the time of acceleration, and is a figure which shows the state whose engine speed is R2. It is a figure which shows the state which each elastic film structure part 30a-30c vibrates to the out-of-plane direction of an elastic film member at the time of acceleration, and is a figure which shows the state whose engine speed is R3. It is a figure which shows the structure of the intake sound emphasizing apparatus 1 which concerns on 2nd embodiment of this invention, and is a figure which shows the structure of the elastic film member 16. FIG. It is a figure which shows the structure of the intake sound emphasizing apparatus 1 which concerns on 3rd embodiment of this invention, and is a figure which shows the structure of the elastic film member. It is the XX sectional view taken on the line of FIG. It is a figure which shows the modification of the intake sound emphasizing apparatus 1 which concerns on 3rd embodiment of this invention. It is a figure which shows the modification of the intake sound emphasizing apparatus 1 which concerns on 3rd embodiment of this invention. It is a figure which shows the structure of the intake sound emphasizing apparatus 1 which concerns on 4th embodiment of this invention, and is a figure which shows the structure of the elastic film member 16. FIG. It is the YY sectional view taken on the line of FIG. It is a figure which shows the modification of the intake sound emphasizing apparatus 1 which concerns on 4th embodiment of this invention. It is a figure which shows the modification of the intake sound emphasizing apparatus 1 which concerns on 4th embodiment of this invention. It is a figure which shows the structure of the intake sound emphasizing apparatus 1 which concerns on 5th embodiment of this invention, and is a figure which shows the structure of the elastic film member 16. FIG. It is a figure which shows the result of having measured the sound pressure level of the intake sound introduce | transduced into a vehicle interior at the time of acceleration using the intake sound enhancement apparatus of this invention, and the conventional intake sound enhancement apparatus. It is a figure which shows the structure of the elastic film member 16 with which the conventional intake sound emphasis apparatus is provided.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Intake sound emphasis apparatus 2 Car compartment 4 Dash panel 6 Engine room 8 Engine 10 Intake duct 12 Communication pipe 14 Additional pipe 16 Elastic film member 18 Dust side side intake duct 20 Clean side side intake duct 22 Air cleaner 24 Throttle chamber 26 Surge tank 28 Intake manifold 30 Elastic membrane component 32 Groove 34 Rigidity changing part 36 Circular rigidity changing part 38 Radial rigidity changing part 40 Convex part 42 Concave part 44 Core material C Vehicle

Claims (9)

A communication pipe that is attached to the outer peripheral surface of an intake duct that forms an intake passage to the engine and communicates with the intake duct, and closes the communication pipe, and elastically deforms in response to a change in intake negative pressure, thereby causing an out-of-plane direction. Inspiratory sound emphasizing device comprising an elastic membrane member that vibrates toward
The inspiratory sound emphasizing device, wherein the elastic membrane member has at least two elastic membrane components having different resonance frequencies that vibrate in an out-of-plane direction of the elastic membrane member.   The intake sound emphasizing device according to claim 1, wherein the at least two elastic film constituent parts have different areas.   The intake sound emphasizing device according to claim 1, wherein at least one of the at least two elastic film constituent portions is different from each other in rigidity and mass.   The intake sound emphasizing device according to any one of claims 1 to 3, wherein the at least two elastic film constituent parts are formed of materials having at least one of rigidity and mass different from each other.   5. The intake sound according to claim 1, wherein a stiffness changing portion having a stiffness different from that of the at least two elastic membrane constituent portions is formed between the at least two elastic membrane constituent portions. Emphasis device.   6. The intake sound emphasizing device according to claim 5, wherein the rigidity changing portion is at least one of a convex portion and a concave portion provided on the surface of the elastic film member.   The intake sound emphasizing device according to claim 5 or 6, wherein the rigidity changing portion has a linear core member.   The stiffness changing portion extends at least from a circular or elliptical circular stiffness changing portion surrounding the center of the elastic membrane member, and from the circular stiffness changing portion to the outer peripheral portion of the elastic membrane member. An intake sound enhancement according to any one of claims 5 to 7, further comprising: a radial stiffness changing portion that divides at least two portions other than a portion surrounded by the circular stiffness changing portion. apparatus. A communication pipe that is attached to the outer peripheral surface of an intake duct that forms an intake passage to the engine and communicates with the intake duct, and closes the communication pipe, and elastically deforms in response to a change in intake negative pressure, thereby causing an out-of-plane direction. Inspiratory sound emphasizing device comprising an elastic membrane member that vibrates toward
The inspiratory sound emphasizing device, wherein the elastic membrane member has at least two resonance frequencies that vibrate in an out-of-plane direction of the elastic membrane member.

Images