JP2008106671A - Exhaust sound reduction structure for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an exhaust sound reduction structure for a vehicle capable of securing large enclosure capacity. <P>SOLUTION: An active exhaust sound control actuator device 10 is provided with a speaker 40 for generating acoustic wave toward exhaust gas discharged from an exhaust pipe 16, a first enclosure forming vessel 30 forming a first enclosure space 30A in an opposite side of an acoustic wave generating side of the speaker 40, a second enclosure forming vessel 42 forming a second enclosure forming space 42A, and a third enclosure forming vessel 48 forming a third enclosure space 48A establishing communication between the first enclosure space 30A and the second enclosure space 42A. The first enclosure forming vessel 30 is arranged between one of a pair of side members 22 and a spare tire storage recess part 26, and the second enclosure forming vessel 42 is arranged between another of the pair of side members 22 and the spar tire storage recess part 26. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a vehicle exhaust noise reduction structure for reducing exhaust noise of a vehicle.

An active canceller system that outputs a muffled pressure wave having a phase opposite to the noise pressure wave of the exhaust gas toward the exhaust gas flowing through the exhaust pipe is known (for example, a spare tire) Patent Document 1).
Japanese Utility Model Publication No. 6-45614

  However, in order to reduce the low-frequency sound pressure that causes the muffled sound, it is necessary to secure a large-capacity enclosure. With the conventional structure described above, it is difficult to effectively reduce the low-frequency sound. there were.

  An object of the present invention is to obtain a vehicle exhaust noise reduction structure capable of securing a large enclosure capacity in consideration of the above facts.

  According to the first aspect of the present invention, there is provided an exhaust noise reduction structure for a vehicle in which sound waves are emitted toward an exhaust system component through which exhaust gas flows, an exhaust gas through the exhaust system, or an exhaust gas discharged from the exhaust system component. Between one of a pair of side members forming a vehicle body skeleton along the vehicle body longitudinal direction and a storage recess formed by bulging the vehicle body floor downward in the vehicle body vertical direction A first space forming member that forms a first space on the opposite side of the speaker from the sound wave generation side, and the second space is disposed between the other of the pair of side members and the housing recess. And a third space forming member that forms a third space that communicates the first space and the second space.

  In the vehicle exhaust sound reduction structure according to claim 1, for example, an exhaust sound is output by outputting a sound wave having a phase opposite to the sound wave emitted from the exhaust system part or the exhaust gas toward the exhaust system part or the exhaust gas from a speaker. Is reduced (silenced). Here, in this vehicle exhaust noise reduction structure, a first space is formed on the opposite side of the loudspeaker to the exhaust system component or the sound wave generation side toward the exhaust gas, and this first space is the third space. It communicates with the second space through the space. In other words, a large-capacity enclosure (box) is formed on the back side of the speaker by effectively using the space between the side member and the housing recess (the peripheral wall).

  Thus, in the vehicle exhaust noise reduction structure according to the first aspect, a large enclosure capacity can be ensured. As a result, the sound generated by the speaker on the back side is prevented from wrapping around, and the spring constant of the air in the enclosure is relatively small with respect to the spring constant of the speaker. That is, the resonance frequency can be kept low and a strong low frequency sound can be generated.

  A vehicle exhaust noise reduction structure according to a second aspect of the invention is the vehicle exhaust noise reduction structure according to the first aspect, wherein the third space forming member is formed in a flat shape in the vertical direction of the vehicle body, and the housing recess The vehicle body is arranged on the lower side in the vertical direction.

  In the vehicle exhaust noise reduction structure according to claim 2, since the flat third space forming member is disposed along the lower side of the housing recess and the first space and the second space are communicated, Compared to a configuration using only a pipe-shaped third space forming member, the space in the lower part of the vehicle body can be effectively used to increase the capacity of the third space, and a larger enclosure capacity can be secured.

  According to a third aspect of the present invention, there is provided an exhaust noise reduction structure for a vehicle in which sound waves are emitted toward an exhaust system component through which exhaust gas flows, an exhaust gas through the exhaust system, or an exhaust gas discharged from the exhaust system component. Is disposed between a speaker for generating the vehicle, a side member forming a vehicle body skeleton along the vehicle body longitudinal direction, and a housing recess formed by bulging the vehicle body floor downward in the vehicle body vertical direction, A first space forming member that forms a first space on the side opposite to the sound wave generation side, and a communication member that communicates the second space formed in the side member with the first space. Yes.

  In the exhaust sound reduction structure for a vehicle according to claim 3, for example, an exhaust sound is output by outputting a sound wave having a phase opposite to a sound wave emitted from the exhaust system component or the exhaust gas toward the exhaust system component or the exhaust gas from a speaker. Is reduced (silenced). Here, in this vehicle exhaust noise reduction structure, a first space is formed on the side of the speaker opposite to the side where sound waves directed to the exhaust system parts or exhaust gas are generated, and this first space is used for communication. It communicates with the second space via the space in the member. In other words, a large-capacity enclosure (box) is formed on the back side of the speaker by effectively using the space between the side member and the housing recess (the peripheral wall) and the space in the side member.

  Thus, in the vehicle exhaust noise reduction structure according to the third aspect, a large enclosure capacity can be ensured. Since the sound generated by the speaker on the back side is prevented from wrapping around and the spring constant of the air in the enclosure is relatively small with respect to the spring constant of the speaker, the spring constant, that is, the resonance frequency of the vehicle exhaust noise reduction structure as a whole. Can be kept low, and a strong low-frequency sound can be generated.

  A vehicle exhaust noise reduction structure according to a fourth aspect of the present invention is the vehicle exhaust noise reduction structure according to any one of the first to third aspects, wherein the first space forming member is the exhaust system component. The exhaust pipe which comprises is inserted.

  In the vehicle exhaust noise reducing structure according to claim 4, since the exhaust pipe is inserted through the first space forming member (the exhaust pipe passes through the first space forming member), the side member and the housing recess A configuration in which the speaker and the enclosure are arranged in the vicinity of the exhaust pipe of the exhaust system component to be muffled or in the vicinity of the exhaust gas in the exhaust pipe by effectively using the space between them is realized.

  A vehicle exhaust noise reduction structure according to a fifth aspect of the invention is the vehicle exhaust noise reduction structure according to the fourth aspect, wherein an internal space of the first space forming member is formed in the first space and the exhaust pipe. The apparatus further includes a partition wall that is separated from an open space that communicates with the atmosphere opening portion, and the speaker is provided on the partition wall.

  In the vehicle exhaust noise reducing structure according to claim 5, sound waves are emitted from the speaker to an open space separated (partitioned) from the first space in the first space forming member by the partition. The exhaust noise is reduced (silenced) by interfering with the exhaust sound (sound wave) discharged from the exhaust pipe at the atmosphere opening portion. By providing an open space in the first space forming member, a sound wave can be emitted coaxially toward the exhaust gas discharged from the atmosphere opening portion of the exhaust pipe, and an effective silencing action can be obtained.

  A vehicle exhaust noise reduction structure according to a sixth aspect of the invention is the vehicle exhaust noise reduction structure according to any one of the first to fifth aspects, wherein the speaker is formed in a flat plate shape with a metal material. It is comprised including the made diaphragm.

  In the vehicle exhaust noise reduction structure according to the sixth aspect, when the actuator is operated, the vibration plate vibrates and a sound wave is emitted toward the exhaust system component or the exhaust gas. Since the diaphragm made of a metal plate faces the high temperature side (exhaust system parts or exhaust gas), a structure with good heat resistance can be obtained.

  As described above, the vehicle exhaust noise reduction structure according to the present invention has an excellent effect that a large enclosure capacity can be secured.

  An active exhaust noise control actuator device 10 to which a vehicle exhaust noise reduction structure according to a first embodiment of the present invention is applied will be described with reference to FIGS. 1 and 2. In the figure, the arrow FR indicates the front direction of the vehicle body, the arrow UP indicates the upward direction of the vehicle body, the arrow IN indicates the vehicle width direction inside, and the arrow OUT indicates the vehicle width direction outside.

  FIG. 2 is a perspective view of an automobile exhaust system 12 to which the active exhaust sound control actuator device 10 is applied. As shown in this figure, an exhaust system 12 of an automobile includes an exhaust pipe 16 having one end serving as an air release portion 16A in order to exhaust the exhaust gas of an engine 14 which is an internal combustion engine out of the system. In this embodiment, the exhaust pipe 16 is joined by an upstream portion 16B side connected to an exhaust manifold 14A provided in each bank of the engine 14 that is a V-type engine at a merging portion 16C downstream of the catalytic converter 17. A catalytic converter 18, a sub-muffler 20, and an active exhaust sound control actuator device 10 are arranged in this order from the upstream between the merging portion 16C and the atmosphere opening portion 16A.

  Catalytic converters 17 and 18 each have a built-in three-way catalyst for purifying exhaust gas containing hydrocarbons, carbon monoxide, nitrogen oxides and the like. The sub muffler 20 attenuates high frequency components (exhaust energy) in the exhaust sound. Although illustration is omitted, the sub-muffler 20 can be configured such that, for example, an inner cylinder (exhaust pipe 16 itself) covered with an outer cylinder is provided with a plurality of resonance holes. It is good also as a structure which has arrange | positioned the sound-absorbing material in between.

  The active exhaust sound control actuator device 10 is disposed at the rear portion of the vehicle body B as shown in FIG. Here, as shown in FIGS. 1 (A) and 1 (B), at the rear part of the vehicle body B, a pair of left and right sides that are respectively long skeleton members in the longitudinal direction of the vehicle body and juxtaposed in the vehicle width direction. A member 22 is provided. Each of the pair of left and right side members 22 has a hat-shaped cross-sectional shape that opens upward, and is joined to the lower surface of the rear floor panel 24 to form a closed cross-sectional structure. In FIG. 1A, the rear floor panel 24 is not shown.

  Further, a spare tire housing recess 26 as a housing recess is formed between the pair of left and right side members 22 by causing the rear floor panel 24 to bulge downward so as to open upward in the vehicle body vertical direction. A spare tire 28 is detachably disposed in the spare tire housing recess 26 from the upper opening end 26A.

  As shown in FIGS. 1 (A) and 1 (B), the active exhaust sound control actuator device 10 includes a first enclosure forming container 30 as a first space forming member. The first enclosure forming container 30 is formed in a cylindrical shape that is long in the longitudinal direction of the vehicle body, and one of the pair of left and right side members 22 (in this embodiment, the right side member 22 facing the vehicle traveling direction). And the spare tire housing recess 26. In this embodiment, the exhaust pipe 16 penetrates the central portion of the first enclosure forming container 30 in the front-rear direction of the vehicle body.

  Specifically, the front and rear open ends of the first enclosure forming container 30 are hermetically sealed by the front wall 32 and the rear wall 34. In the rear wall 34, the front end of the speaker sound outlet pipe 35 whose rear opening end is a speaker sound outlet 35A has a speaker sound outlet 35A and a space in the first enclosure forming container 30 (an open space 30B described later). Connected to communicate. Further, an inner pipe 36 that is elongated in the longitudinal direction of the vehicle body is disposed in the center of the first enclosure forming container 30 and the inner pipe 36. The front end of the inner pipe 36 is joined to the front wall 32 and opens forward.

  The rear portion 16D of the exhaust pipe 16 is coaxially disposed in the inner pipe 36 (the first enclosure forming container 30 and the speaker sound outlet pipe 35) via the wire mesh 37. In this embodiment, the rear opening end 36A of the inner pipe 36, the atmosphere opening portion 16A, and the speaker sound outlet 35A are substantially coincided with each other in the longitudinal direction of the vehicle body and are coaxially arranged.

  The first enclosure forming container 30 described above is provided with a partition wall 38 that partitions the space in the first enclosure forming container 30 into a first enclosure space 30A (capacity) and an open space 30B. The partition wall 38 extends in the up-down direction and the vehicle width direction, extends to the front and rear sides of the first enclosure space 30A and the open space 30B, and extends substantially in the up-down direction and the front-back direction to open the first enclosure space 30A. It has a vertical wall 38B that partitions the space 30B substantially left and right. The lateral wall 38 </ b> A penetrates the inner pipe 36 and supports the inner pipe 36 with respect to the first enclosure forming container 30 together with the front wall 32.

  The partition wall 38 is disposed at the rear part of the first enclosure forming container 30, and the open space 30 </ b> B is a rear end side of the space in the first enclosure forming container 30 and the corners on the outer side in the vehicle width direction. is occupying. The open space 30B communicates with the speaker sound outlet 35A, that is, outside the exhaust system through the speaker sound outlet pipe 35 as described above. Further, the exhaust pipe 16 passes through the lateral wall 38A.

  In the active exhaust sound control actuator device 10, the speaker 40 is provided on the vertical wall 38B. The speaker 40 has a diaphragm 40A that vibrates and sounds to be exposed to the open space 30B through a speaker hole 38C provided in the vertical wall 38B, and the air in the open space 30B is vibrated to generate sound. . In this embodiment, the vibration plate 40A is formed of a metal material in a flat plate shape, and is elastic (can vibrate) to the first enclosure forming container 30 or the partition wall 38 via an elastic member (edge, spring, etc.) not shown. ).

  The speaker 40, which has a flat diaphragm 40A and is a so-called flat speaker, has an actuator using, for example, a voice coil, a piezoelectric element, or a magnetostrictive element. When the actuator is operated, the diaphragm 40A is at the frequency. It vibrates and emits a sound wave having the above frequency toward the open space 30B. This sound wave is guided backward (changed in direction) by the open space 30 </ b> B, and is emitted from the speaker sound outlet 35 </ b> A via the speaker sound outlet pipe 35. The speaker 40 may be a cone type speaker having a cone type diaphragm.

  The diaphragm 40A of the speaker 40 is covered with a portion constituting the first enclosure space 30A in the first enclosure forming container 30 on the back side opposite to the sound wave generating side, and is opposite to the open space 30B. The sound wave having the opposite phase generated at the side is prevented from entering the open space 30B side.

  Further, as shown in FIGS. 1A and 1B, the active exhaust sound control actuator device 10 includes a second enclosure forming container 42 as a second space forming member. The second enclosure forming container 42 is formed in a longitudinal cylindrical shape similar to the first enclosure forming container 30 in the longitudinal direction of the vehicle body, and is disposed between the left side member 22 and the spare tire accommodating recess 26. Yes. The front and rear opening ends of the second enclosure forming container 42 are hermetically sealed by a front wall 44 and a rear wall 46, respectively, and a second enclosure space 42A as a second space is formed inside.

  Further, as shown in FIGS. 1A and 1B, the active exhaust noise control actuator device 10 includes a third enclosure forming container 48 as a third space forming member. The third enclosure forming container 48 is flattened in the vehicle body vertical direction, extends in the vehicle body longitudinal direction and vehicle width direction, and bridges between the left and right first enclosure forming containers 30 and the second enclosure forming container 42. As shown in FIG. 1B, the third enclosure space 48A as the third space formed in the third enclosure formation container 48 communicates the first enclosure space 30A and the third enclosure space 48A. . 48 described above is arranged along the lower surface 26 </ b> B of the spare tire housing recess 26.

  Furthermore, the active exhaust sound control actuator device 10 includes a dummy pipe 50 attached to the rear wall 46 of the second enclosure formation container 42. The dummy pipe 50 is formed in a shape similar to the speaker sound outlet pipe 35, and is provided to make an appearance like a vehicle having a pair of left and right main mufflers (dual muffler type). Thereby, the appearance and merchantability of the vehicle viewed from the back side can be improved. A dummy pipe having a shape similar to the exhaust pipe 16 may be further provided in the dummy pipe 50.

  The active exhaust noise control actuator device 10 includes a control device (silencing ECU) (not shown). For example, the control device is configured to output a sound wave having a substantially equal sound pressure in an opposite phase to the exhaust sound based on the output of a microphone or an engine tachometer that outputs a signal corresponding to the rotational speed of the engine 14. It is set as the structure which controls. In this embodiment, the active exhaust sound control actuator device 10 is set so that mainly the low frequency exhaust sound is muted, that is, the speaker 40 generates low frequency sound waves.

  In the entire exhaust system 12 of the automobile, the sub muffler 20 (and the built-in sound absorbing material) reduces the exhaust noise of the high frequency component, and the active exhaust sound control actuator device 10 is configured to perform the reduction (silence) of the low frequency exhaust sound. ing. Therefore, the exhaust system 12 of the automobile provided with the active exhaust sound control actuator device 10 is configured not to include a main muffler that uses exhaust gas expansion or resonance.

  Next, the operation of the first embodiment will be described.

  In an automobile exhaust system 12 to which the active exhaust noise control (ACN) actuator device 10 having the above-described configuration is applied, exhaust gas is discharged from an engine 14 to an exhaust pipe 16 via an exhaust manifold 14A. The exhaust noise of the high frequency component is reduced by the sub-muffler 20 (exhaust energy is consumed), passes through the active exhaust sound control actuator device 10, and is released from the atmosphere opening portion 16A.

  In the active exhaust sound control actuator device 10, the speaker 40 is operated to generate sound waves having substantially the same sound pressure in the opposite phase to the sound waves of the exhaust gas released to the atmosphere (sound waves mainly composed of low frequency components). From the surroundings of the open air portion 16A (coaxially). When this sound wave interferes with (cancels) the sound wave of the exhaust gas, the low-frequency sound of the exhaust gas is silenced, and it is effectively suppressed or prevented from generating a muffled sound in the passenger compartment. At this time, the sound wave emitted to the back side by the diaphragm 40A of the speaker 40 is prevented from entering the open space 30B by the first enclosure forming container 30 and the partition wall 38.

  Here, in the active exhaust sound control actuator device 10, the first enclosure space 30 </ b> A of the first enclosure formation container 30, the second enclosure space 42 </ b> A of the second enclosure formation container 42, and the third enclosure of the third enclosure formation container 48. Since the space 48A communicates with each other, a large enclosure capacity is secured. For this reason, in the active exhaust sound control actuator device 10, the lowest resonance frequency of the speaker 40 (diaphragm 40A) can be lowered, and a low frequency sound with a high sound pressure can be output.

  That is, the air in the space constituting the enclosure acts as a spring element grasped as a parallel spring with the mechanical spring element of the speaker 40, and its spring constant is inversely proportional to the capacity of the enclosure space. In this case, the spring constant of the speaker 40 becomes high (the spring constant of the air spring becomes relatively high with respect to the spring constant of the mechanical spring element), and the minimum resonance frequency of the speaker 40 becomes high. In the actuator device 10, since the enclosure capacity is large as described above, the lowest resonance frequency of the speaker 40 can be kept low. As a result, the active exhaust sound control actuator device 10 can output a low-frequency sound having a high sound pressure as described above, and thus effectively muffles the exhaust sound in the low-frequency band in which the muffled sound in the passenger compartment becomes a problem. can do.

  The automobile exhaust system 12 having the active exhaust sound control actuator device 10 that effectively silences the low frequency sound in this manner does not have a main muffler (energy attenuator) that uses exhaust gas expansion or resonance. Thus, the output of the engine 14 can be improved and the fuel consumption can be reduced by reducing the back pressure.

  In the active exhaust noise control actuator device 10, the first enclosure forming container 30 and the second enclosure forming container 42 are disposed between the left and right side members 22 and the spare tire housing recess 26, thereby A configuration that secures a large enclosure capacity by effectively utilizing the space was realized. In particular, in the active exhaust sound control actuator device 10, the third enclosure forming container 48 arranged along the lower surface 26B of the spare tire housing recess 26 extends in the vehicle body front-rear direction to ensure the capacity. Overall, a larger enclosure space could be secured.

  Further, in the active exhaust sound control actuator device 10, since the first enclosure forming container 30 is passed through the exhaust pipe 16, a configuration for effectively using the space of the vehicle body B together with the exhaust system 12 of the automobile is realized. . Then, by passing through the exhaust pipe 16, it is possible to provide a speaker sound outlet 35A that outputs a sound wave for silencing from the periphery of the atmosphere opening portion 16A, and it is possible to perform an effective silencing action.

  In particular, by providing a partition wall 38 behind the first enclosure forming container 30 (on the downstream side of the exhaust gas flow), an open space 30B, which is a space for guiding sound waves from the speaker 40 to the speaker sound outlet 35A, is provided and opened. A configuration has been realized in which the space 30B is kept small and the capacity of the first enclosure space 30A is secured.

  Moreover, since the active exhaust sound control actuator device 10 includes the speaker 40 having the metal diaphragm 40A, it has good heat resistance and environmental resistance. For this reason, the active exhaust noise control actuator device 10 may have a simple configuration in which the installation of the inner pipe 36 is omitted, for example.

  In the first embodiment, the active exhaust sound control actuator device 10 includes the third enclosure formation container 48 (third enclosure space 48A). However, the present invention is not limited to this, and for example, the flat Instead of the third enclosure forming container 48 having a shape, a pipe or the like that communicates the first enclosure space 30A and the second enclosure space 42A may be provided. In this case, the pipe can be routed radially outside the spare tire housing recess 26.

  Next, another embodiment of the present invention will be described. Note that components or parts that are basically the same as those in the first embodiment described above are denoted by the same reference numerals as those in the first embodiment, and description thereof is omitted, and illustration may be omitted.

(Second Embodiment)
3A and 3B show an active exhaust sound control actuator device 60 according to a second embodiment of the present invention in a front sectional view and a plan sectional view, respectively. As shown in these drawings, the active exhaust sound control actuator device 60 does not include the second enclosure formation container 42 and the third enclosure formation container 48, and instead of the first enclosure formation container 30, the first enclosure formation container 30 is provided. 62 is different from the active exhaust sound control actuator device 10 according to the first embodiment.

  The first enclosure forming container 62 is formed in a substantially rectangular cylindrical shape that is long in the longitudinal direction of the vehicle body, and is disposed between one of the pair of left and right side members 22 and the spare tire housing recess 26. In this embodiment, the first enclosure forming container 62 has a vertically long cross-sectional shape that is longer in the vehicle body vertical direction than in the vehicle width direction. The first enclosure forming container 62 is hermetically sealed at the front and rear opening ends by a front wall 64 and a rear wall 66, respectively. Further, in the first enclosure forming container 62 and the speaker sound outlet pipe 35, the rear part of the exhaust pipe 16 is interposed via the wire mesh 37, as in the first enclosure forming container 30 (the front wall 32 and the rear wall 34). An inner pipe 36 that coaxially supports 16D is disposed.

  Further, the first enclosure forming container 62 is partitioned into a first enclosure space 62A and an open space 62B by a partition wall 68 disposed therein and through which the exhaust pipe 16 passes. Near the rear end (rear wall 66) of the first enclosure forming container 62, it extends in the vehicle width direction and the vehicle body vertical direction, and divides the first enclosure space 62A and the open space 62B forward and backward. The partition wall 68 supports the inner pipe 36 with respect to the first enclosure forming container 62 with the front wall 64.

  The speaker 40 is provided above the inner pipe 36 (exhaust pipe 16) penetrating portion of the partition wall 68. The attachment structure of the speaker 40 to the partition wall 68 is the same as the attachment structure of the speaker 40 to the vertical wall 38B in the active exhaust sound control actuator device 10. That is, the diaphragm 40A of the speaker 40 is exposed to the open space 62B from the speaker hole 68A provided in the partition wall 68, and the air in the open space 62B is vibrated to generate sound.

  Further, in the active exhaust sound control actuator device 60, a partition wall 70 is disposed in the side member 22 adjacent to the first enclosure forming container 62, and the partition wall 70 and the partition wall 70 are formed in the side member 22 in the left side member 22. A second enclosure space 22 </ b> A as a second space is formed between the rear wall 72. The second enclosure space 22A communicates with the first enclosure space 62A via a duct member 74 as a communication member.

  In this embodiment, the duct member 74 is connected to the front wall 64 and the inner wall 76 of the side member 22, and communicates the second enclosure space 22A and the first enclosure space 62A. It is disposed within the height range of the member 22 (there is no portion projecting up and down from the upper and lower ends of the side member 22). Other configurations of the active exhaust sound control actuator device 60 are the same as the corresponding configurations of the active exhaust sound control actuator device 10.

  In the active exhaust sound control actuator device 60 configured as described above, the first enclosure space 62A and the second enclosure space 22A are in communication with each other. In other words, the side member 22, the spare tire accommodating recess 26, and the side member 22 A large enclosure capacity is secured by effectively using the space. Therefore, the active exhaust sound control actuator device 60 according to the second embodiment also effectively silences the low frequency component of the exhaust sound by the same action as the active exhaust sound control actuator device 10 according to the first embodiment. can do. That is, in the active exhaust sound control actuator device 60, the lowest resonance frequency of the speaker 40 (diaphragm 40A) can be lowered, and a low frequency sound with a high sound pressure can be output.

  In the active exhaust noise control actuator device 60, the partition wall 70 is disposed in the left side member 22 in the side member 22 to form the second enclosure space 22A. The lowest resonance frequency of the speaker 40 can be easily set (adjusted) to a desired frequency.

(Third embodiment)
4A and 4B show an active exhaust noise control actuator device 80 according to a third embodiment of the present invention in a front sectional view and a plan sectional view, respectively. As shown in these drawings, the active exhaust sound control actuator device 80 is different from the active exhaust sound control actuator device 60 according to the second embodiment in that a duct member 82 is provided instead of the duct member 74.

  The duct member 82 is connected to the bottom wall 84 of the first enclosure forming container 62 and the bottom wall 86 of the side member 22, and communicates the second enclosure space 22A and the first enclosure space 62A. Thereby, the duct member 74 avoids interference with the wiring / pipe 88 disposed between the inner wall 76 of the side member 22 and the first enclosure forming container 62. Other configurations of the active exhaust sound control actuator device 80 are the same as the corresponding configurations of the active exhaust sound control actuator device 60.

  In the active exhaust sound control actuator device 80 having the above-described configuration, the first enclosure space 62A and the second enclosure space 22A are in communication with each other, and therefore, by the same operation as the active exhaust sound control actuator device 10 according to the first embodiment. The same effect can be obtained.

  In each of the above-described embodiments, the exhaust pipe 16 has penetrated the first enclosure forming containers 30 and 62. However, the present invention is not limited to this. For example, the exhaust pipe 16 has the first enclosure forming container. It is good also as a structure arrange | positioned outside 30 and 62. FIG.

  In each of the above-described embodiments, the speaker 40 vibrates the air in the open spaces 30B and 62B. However, the present invention is not limited to this. For example, the speaker 40 is connected to the atmosphere opening portion 16A. The device may be configured to vibrate, the air (exhaust gas) in the communication pipe communicating with the exhaust pipe 16 may be vibrated, the exhaust pipe 16, the sub muffler 20, The structure which vibrates the air between the surfaces of other exhaust system parts (including a main muffler which the exhaust system 12 of the automobile does not have) may be used. That is, the target of noise reduction by the active exhaust noise control actuator devices 10, 60, 80 is not limited to exhaust gas, but includes exhaust system parts through which exhaust gas flows.

It is a figure which shows the active exhaust sound control actuator apparatus which concerns on the 1st Embodiment of this invention, Comprising: (A) is a top view, (B) is front sectional drawing. 1 is a perspective view showing an exhaust system of an automobile to which an active exhaust sound control actuator device according to a first embodiment of the present invention is applied. It is a figure which shows the active exhaust sound control actuator apparatus which concerns on the 2nd Embodiment of this invention, Comprising: (A) is front sectional drawing, (B) is a plane sectional view. It is a figure which shows the active exhaust sound control actuator apparatus which concerns on the 3rd Embodiment of this invention, Comprising: (A) is front sectional drawing, (B) is a plane sectional view.

Explanation of symbols

10 Active exhaust noise control actuator device (Vehicle exhaust noise reduction structure)
16 Exhaust pipe 22 Side member 22A Second enclosure space (second space)
24 Rear floor panel (body floor)
26 Spare tire housing recess (housing recess)
30 First enclosure forming container (first space forming member)
30A First enclosure space (first space)
38 Bulkhead 40 Speaker 40A Diaphragm 42 Second enclosure forming container (second space forming member)
42A Second enclosure space (second space)
48 Third enclosure forming container (third space forming member)
48A 3rd enclosure space (3rd space)
60/80 Active exhaust noise control actuator device (Vehicle exhaust noise reduction structure)
62 1st enclosure formation container (1st space formation member)
62A First enclosure space (first space forming member)
74/82 Duct member (Communication member)

Claims (6)

An exhaust system component through which the exhaust gas circulates, an exhaust gas through the exhaust system, or a speaker for generating sound waves toward the exhaust gas emitted from the exhaust system component;
Between one of a pair of side members forming a vehicle body skeleton along the longitudinal direction of the vehicle body and a storage recess formed by expanding the vehicle body floor downward in the vehicle body vertical direction; A first space forming member that forms a first space on the side opposite to the generation side;
A second space forming member disposed between the other of the pair of side members and the storage recess, and forming a second space;
A third space forming member that forms a third space that communicates the first space and the second space;
Vehicle exhaust noise reduction structure with   2. The vehicle exhaust sound reduction structure according to claim 1, wherein the third space forming member is formed in a flat shape in a vertical direction of the vehicle body and is disposed on a lower side of the housing recess in the vertical direction of the vehicle body. An exhaust system component through which the exhaust gas circulates, an exhaust gas through the exhaust system, or a speaker for generating sound waves toward the exhaust gas emitted from the exhaust system component;
Arranged between a side member forming a vehicle body skeleton along the longitudinal direction of the vehicle body and a housing recess formed by bulging the vehicle body floor downward in the vertical direction of the vehicle body, and opposite to the sound wave generating side of the speaker A first space forming member that forms a first space in
A communicating member that communicates the second space formed in the side member with the first space;
Vehicle exhaust noise reduction structure with   The exhaust sound reduction structure for a vehicle according to any one of claims 1 to 3, wherein the first space forming member is inserted through an exhaust pipe constituting the exhaust system component. A partition that divides the internal space of the first space forming member into the first space and an open space that communicates with an air release portion in the exhaust pipe;
The vehicle exhaust sound reduction structure according to claim 4, wherein the speaker is provided in the partition wall.   The exhaust sound reduction structure for a vehicle according to any one of claims 1 to 5, wherein the speaker includes a diaphragm formed of a metal material in a flat plate shape.

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