JP4555133B2 - Engine intake sound introduction structure - Google Patents

Description

  The present invention relates to an engine intake sound introduction structure that introduces intake sound of a vehicle engine into a passenger compartment.

In a vehicle such as a passenger car, it is known to actively introduce intake sound generated from an intake system in which an engine inhales outside air into a passenger compartment where a passenger lives in order to respond to user preferences.
For example, it is known that a flexible tube branched from a part of an intake duct connected to the intake side of the engine is provided and the other end is connected to a bulkhead between the engine room and the passenger compartment. (For example, Patent Document 1).
JP 2004-218458 A

However, since recent automobiles are becoming denser in the engine room, it is difficult to secure a space for arranging the flexible tube in the engine room as in the above-described prior art.
Further, in order to effectively introduce the intake sound into the vehicle interior, it is required to increase the size of the pipeline for introducing the intake sound to some extent, but it is laid in the engine room as in the above-described prior art. When the flexible tube is used, as the thickness increases, it becomes more difficult to secure a space in the engine room.
In view of the above-described problems, an object of the present invention is to provide an engine intake sound introduction structure that effectively uses space and effectively introduces engine intake sound into a vehicle interior.

The present invention solves the above-described problems by the following means.
The invention of claim 1 is an intake pipe for introducing the outside air into the engine, extends along the engine room where the engine is accommodated, one end connected to the partition wall between the passenger compartment outside the passenger compartment A hollow frame, a communication portion that is provided between the intake pipe and the frame, communicates with the inside of the intake pipe and the inside of the frame, and is formed in the partition wall. The engine intake sound introduction structure includes an opening for communicating with the diaphragm and a diaphragm provided to close the opening of the partition wall .

According to a second aspect of the present invention, in the engine intake sound introduction structure according to the first aspect, the communication portion is provided with one end portion branched from the intake pipe line and the other end portion connected to the frame. An engine intake sound introduction structure including a branch pipe.
According to a third aspect of the present invention, in the engine intake sound introduction structure according to the first aspect, at least one of the frame and the communication portion has a partial cross section along the longitudinal direction of the frame or the communication portion. An engine intake sound introduction structure including an acoustic characteristic adjusting unit that closes.
According to a fourth aspect of the present invention, in the engine intake sound introduction structure according to any one of the first to third aspects, an indoor intake sound introduction pipe that is provided in the vehicle interior and communicates with the opening. An engine intake sound introduction structure characterized by comprising a road.

The invention of claim 5, an intake pipe for introducing the outside air into the engine, extends along the engine room where the engine is accommodated, one end connected to the partition wall between the passenger compartment outside the passenger compartment A hollow frame, an opening formed in the partition wall and communicating between the vehicle interior and the frame, one end portion is provided to branch from the intake pipe, and the other end portion is provided in the frame and the frame. A branch pipe inserted into the vehicle compartment via an opening, and a diaphragm provided on an end surface of the branch pipe on the vehicle interior side and arranged so as to close a transverse section of the branch pipe The engine intake sound introduction structure is provided.
According to a sixth aspect of the present invention, in the structure for introducing engine intake noise according to the fifth aspect , the branch pipe includes an acoustic characteristic adjusting unit that closes a part of a cross section along the longitudinal direction of the branch pipe. An engine intake sound introduction structure characterized by comprising:

According to the present invention, the following effects can be achieved.
(1) Since the intake pipe line and the vehicle interior communicate with each other via the inside of the frame, the space in the engine room is effectively used and the engine intake sound is effectively introduced into the vehicle interior. Can do.
(2) Since the intake pipe and the frame are configured to communicate with each other by a branch pipe branched from the intake pipe, even if the intake pipe does not pass through the vicinity of the frame, introduction of engine intake noise is introduced. The structure can be easily applied.
(3) Since the acoustic characteristic adjustment part that partially closes the cross section is provided in at least one of the frame and the communication part, the sound quality of the intake sound introduced into the passenger compartment and the degree of freedom in tuning of the volume are secured. can do. As the acoustic characteristic adjusting unit, for example, a vibration plate that radiates sound by being vibrated by a pressure wave, a sound absorbing material that absorbs acoustic energy and reduces sound pressure, and an air column A partition plate or the like for adjusting the wavelength of resonance can be used, and a combination of these functions may be used.
(4) Since the diaphragm provided by closing the opening is provided, the engine intake sound can be effectively radiated from the diaphragm into the passenger compartment when the diaphragm vibrates.
In addition, even if such a diaphragm and the above-described acoustic characteristic adjusting unit are formed of an airtight material, the communication unit is provided on the downstream side of the air cleaner element. It is possible to prevent inhalation of air that has not been filtered. Furthermore, even when the communication portion is provided in a region downstream of the junction of blow-by gas in the intake pipe, it is possible to prevent the blow-by gas or the like from flowing into the vehicle interior.
(5) Since the indoor intake sound introduction conduit communicating with the opening is provided in the vehicle interior, the intake sound can be introduced to a portion closer to the listening position of the driver or the like than the opening.
(6) When the branch pipe is inserted into the vehicle compartment via the inside of the frame, the frame itself is not required to be airtight, and its acoustic characteristics need not be taken into consideration. Can be improved.

  An object of the present invention is to provide an engine intake sound introduction structure that can effectively use the space and can effectively introduce the intake sound, and has a region upstream of the air cleaner element in the air cleaner case and the main frame. This is realized by providing a branch pipe that communicates with the toe board and forming an opening that communicates with the main frame.

Embodiment 1 of an engine intake sound introduction structure to which the present invention is applied will be described below with reference to the drawings.
FIGS. 1 and 2 are schematic views showing a configuration of an engine intake sound introduction structure according to the first embodiment, and are views showing a state viewed from the side of the vehicle and from above, respectively.
The engine intake sound introduction structure according to the first embodiment includes a vehicle body 100 and an intake (induction) system 200.

The vehicle body 100 includes a vehicle compartment 110, an engine room 120, a toe board 130, and a main frame 140.
The passenger compartment 110 has a space in which a passenger such as a driver lives.
The engine room 120 is provided on the front side of the vehicle with respect to the passenger compartment 110, and includes a space for accommodating the engine E (not shown in FIG. 1; see FIG. 2) and supplementary notes (not shown). Yes.
The toe board 130 is a partition wall (bulk head) provided between the vehicle compartment 110 and the engine room 120.
The main frame 140 is a cylindrical structural member that is disposed on both sides of the engine room 120 in the vehicle width direction and extends substantially along the vehicle front-rear direction, and supports the engine E, a cross member (not shown), and the like. Is. The main frame 140 has an end on the vehicle front side closed, and an end on the vehicle rear side connected to the toe board 130.
Further, the toe board 130 is formed with an opening 131 communicating with the hollow portion in the main frame 140. The opening 131 is provided with a lid-shaped diaphragm 132 that closes the opening 131. The diaphragm 132 is vibrated by vibration of air in the main frame 140, generates sound from itself, and radiates it into the passenger compartment 110.
The main frame 140 is substantially hermetically sealed by closing holes and gaps except for a connection portion between the opening 131 and a branch pipe 260 serving as a communication portion described later.

The intake system 200 includes an air intake duct 210, an air cleaner case 220, an intake pipe 230, a throttle body 240, an intake manifold 250, and a branch pipe line 260.
The air intake duct 210 is provided with an air inlet that is open to the outside at one end thereof, and the other end is connected to the air cleaner case 220 and communicates with the inside thereof.
The air cleaner case 220 is formed in a container shape, and an air cleaner element 221 for filtering fine foreign matters contained in the intake air is accommodated therein. As shown in FIG. 2, the air cleaner case 220 is disposed at the upper part of the main frame 140 on the right side in the traveling direction of the vehicle.
The intake pipe 230 has one end communicating with the space on the downstream side of the air cleaner element 221 of the air cleaner case 220, and the other end connected to the throttle body 240.
The throttle body 240 houses a throttle valve that limits the intake air amount of the engine E in accordance with an operation of a throttle operation unit (not shown).
The intake manifold 250 is connected to the downstream side of the throttle body 240 and includes branch pipes connected to intake ports of cylinders (not shown) of the engine E.
One end of the branch pipe 260 is connected to the air cleaner case 220 and communicates with the space upstream of the air cleaner element 221 inside, and the other end is connected to the main frame 140. And is disposed along the substantially vertical direction between the lower surface portion of the air cleaner case 220 and the upper surface portion of the main frame 140.

In the first embodiment, when the operation of the engine E is started, the intake system 200 generates an air flow flowing through the intake system 200 and an intake sound due to intake air pulsation propagating from the engine E side.
This intake sound is introduced into the main frame 140 from the air cleaner case 220 via the branch conduit 260, propagates through the inside, and is transmitted to the diaphragm 132 of the opening 131. Accordingly, the diaphragm 132 vibrates, and the intake sound is radiated from the diaphragm 132 into the vehicle interior as a pressure wave generated by the vibration.

As described above, according to the first embodiment, the branch conduit 260 that communicates between the air cleaner case 220 and the main frame 140 is provided, and the opening 131 that communicates from the main frame 140 to the vehicle interior 110 is formed. Therefore, the engine intake sound generated in the air cleaner case 220 is effectively introduced to the vehicle compartment 110 side via the branch conduit 260 and the main frame 140.
Further, as compared with the case where such an engine sound introduction structure is not applied, the space in the engine room 120 can be used only by the branch pipeline 260. For example, a flexible tube is routed around the vehicle compartment. The space in the engine room can be effectively utilized as compared with the prior art connected to the partition wall.
Further, since the diaphragm 132 is provided in the opening 131, the engine intake sound is more effectively introduced into the passenger compartment 110, and the sound quality and volume are tuned by setting the material and shape of the diaphragm 132. It can be performed.

Next, a second embodiment of the engine intake sound introduction structure to which the present invention is applied will be described.
In each of the embodiments described below, the same parts as those in the first embodiment described above are denoted by the same reference numerals, description thereof is omitted, and differences are mainly described.
FIG. 3 is a schematic diagram illustrating a configuration of an engine intake sound introduction structure according to the second embodiment.
In the second embodiment, instead of the branch pipe 260 of the first embodiment, a branch pipe 260 a having one end branched from the middle of the intake pipe 230 and the other end connected to the main frame 140 is provided. .

In this case, since the branch pipe line 260a is on the downstream side of the air cleaner element 221, the blow-by gas normally blown into the intake system 200 in this region flows into the main frame 140 through the branch pipe line 260a. Since there is a case, in order to prevent the inflow into the passenger compartment 110, the diaphragm 132 provided in the opening 131 of the toe board 130 is preferably an airtight one.
Further, by using an airtight diaphragm 132, it is possible to prevent air that has not passed through the air cleaner from entering the interior of the vehicle compartment 110 to the intake system 200 side.
According to the second embodiment, in addition to the effects of the first embodiment described above, the arrangement and configuration of the branch pipe as the communication portion are not easily affected by the position of the air cleaner case, so that the degree of freedom in design can be improved. .

FIG. 4 is a schematic diagram showing the configuration of a third embodiment of the engine intake sound introduction structure to which the present invention is applied.
In the third embodiment, a diaphragm 141, which is a partition plate that closes a cross section of the main frame 140, is provided between a portion of the main frame 140 to which the branch pipeline 260 is connected and the toe board 130.
The vibration plate 141 is an acoustic characteristic adjusting unit that is formed into a thin plate shape, for example, of resin or rubber-based material, and is configured to vibrate by a pressure wave of intake pulsation introduced into the main frame 140.
According to the third embodiment, in addition to the effects of the first embodiment described above, the frequency of the air column resonance depending on the pipe length into which the engine intake sound is introduced can be adjusted by the position of the diaphragm 141, Further, by adjusting the resonance characteristics and vibration damping ability of the diaphragm 141, the tone color and volume of the engine intake sound introduced into the passenger compartment 110 can be adjusted.

FIG. 5 is a schematic diagram showing the configuration of a fourth embodiment of an engine intake sound introduction structure to which the present invention is applied.
In the fourth embodiment, the interior side intake sound separate from the main frame 140 that is opened into the vehicle interior 110 through the opening 131 a formed in the toe board 130 at the end of the main frame 140 on the vehicle interior 110 side. The introduction pipe line 140a is coupled.
An opening 142 that communicates the interior of the vehicle compartment 110 and the interior of the main frame 140 is formed on the end surface on the indoor side of the indoor intake sound introduction conduit 140a. The opening 142 has a lid-shaped diaphragm 143 that closes the opening 142. Is provided.
According to the fourth embodiment, in addition to the effects of the first embodiment described above, the position of the sounding portion that radiates the engine intake sound into the passenger compartment 110 is arranged at a more preferable position in consideration of the sound field in the passenger compartment 110. Therefore, the engine intake sound can be introduced into the passenger compartment 110 more effectively.

FIG. 6 is a schematic diagram showing the configuration of a fifth embodiment of the structure for introducing engine intake sound to which the present invention is applied.
In the fifth embodiment, a branch line 260b that is branched from an area upstream of the air cleaner element 221 of the air cleaner case 220 and is configured by a flexible tube is inserted into the main frame 140, and the vehicle interior is opened from the opening 131b of the toe board 130. 110.
A diaphragm 261 is provided on the end surface of the branch pipe line 260b on the side of the passenger compartment 110, with the transverse section being closed.
According to the fifth embodiment, in addition to the effects of the first embodiment described above, it is not necessary to consider the acoustic characteristics and confidentiality of the main frame 140 itself.

(Modification)
The present invention is not limited to the embodiments described above, and various modifications and changes are possible, and these are also within the equivalent scope of the present invention.
(1) The position where the intake pipe line and the frame are communicated is not limited to the configuration of each of the embodiments described above. As for the position on the intake pipe side, in the case of an engine equipped with a throttle valve, such as a general gasoline engine, it may be upstream of the throttle valve in order to ensure responsiveness to the throttle operation. This does not apply to engines that employ a valve throttle that uses an intake valve or diesel engines. In addition, in the case of an engine with a supercharger such as a turbocharger or a mechanical supercharger (MSC), it is preferable to set it upstream of the supercharger in order to ensure responsiveness to supercharging.
A plurality of communication portions may be provided.
(2) Each of the embodiments described above relates to a vehicle having an engine room on the front side of the passenger compartment, but the present invention is, for example, a vehicle in which the engine room is arranged on the rear side of the passenger compartment or under the floor. Even can be applied.
(3) In the above-described third embodiment, the diaphragm that is the acoustic characteristic adjusting unit is provided in the middle part of the communication part and the partition part in the frame, but is not limited thereto, and the acoustic characteristic part is, for example, In addition, it may be provided in a branch pipeline that is a communication portion. A plurality of acoustic characteristic adjustment units may be provided.
(4) The acoustic characteristic adjustment unit is not limited to the diaphragm. For example, as the acoustic characteristic adjustment unit, the intake sound is attenuated to reduce the overall sound pressure, or the characteristic frequency band is reduced. In order to adjust the sound quality, an acoustic damping member having a foamed body such as urethane foam or a viscoelastic body such as a rubber-based material may be provided.

It is the schematic which shows the structure of Example 1 of the introductory structure of the engine intake sound to which this invention is applied, Comprising: It is a figure which shows the state seen from the vehicle width direction of the vehicle. It is a figure which shows the state which looked at the introduction structure of the engine intake sound of FIG. 1 from the vehicle upper direction. It is the schematic which shows the structure of Example 2 of the introduction structure of the engine intake sound to which this invention is applied. It is the schematic which shows the structure of Example 3 of the introduction structure of the engine intake sound to which this invention is applied. It is the schematic which shows the structure of Example 4 of the introductory structure of the engine intake sound to which this invention is applied. It is the schematic which shows the structure of Example 5 of the introductory structure of the engine intake sound to which this invention is applied.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Car body 110 Car compartment 120 Engine room 130 Toe board 131 Opening part 140 Main frame 141 Diaphragm 200 Intake system 210 Intake duct 220 Air cleaner case 221 Air cleaner element 230 Air intake pipe 240 Throttle body 250 Intake manifold 260 Branch pipe

Claims (6)

An intake line for introducing outside air into the engine;
A hollow frame connected to the partition wall between the engine extends along the engine compartment to be accommodated, the cabin outside one end portion and the vehicle interior,
A communication portion that is provided between the intake pipe and the frame, and communicates the inside of the intake pipe with the inside of the frame ;
An opening formed in the partition wall for communicating the vehicle interior and the frame ;
A structure for introducing engine intake sound , comprising: a diaphragm provided by closing the opening of the partition wall . In the structure for introducing engine intake noise according to claim 1,
The structure for introducing engine intake noise is characterized in that the communication part includes a branch pipe having one end branched from the intake pipe and the other end connected to the frame. In the structure for introducing engine intake noise according to claim 1,
At least one of the frame and the communication portion includes an acoustic characteristic adjusting portion that closes a part of a cross section along the longitudinal direction of the frame or the communication portion. In the structure for introducing engine intake sound according to any one of claims 1 to 3 ,
An intake structure for introducing engine intake sound, comprising an indoor intake sound introduction pipe line provided in the vehicle interior and communicating with the opening. An intake line for introducing outside air into the engine;
A hollow frame connected to the partition wall between the engine extends along the engine compartment to be accommodated, the cabin outside one end portion and the vehicle interior,
An opening formed in the partition wall for communicating the vehicle interior and the frame;
A branch pipe provided with one end branched from the intake pipe and the other end inserted into the vehicle compartment in the frame and through the opening ;
An intake structure for introducing engine intake sound, comprising: a diaphragm provided on an end surface of the branch pipe on the vehicle interior side and arranged so as to close a cross section of the branch pipe . The engine intake sound introduction structure according to claim 5 ,
The structure for introducing engine intake sound, wherein the branch pipe includes an acoustic characteristic adjusting section that closes a part of a cross section along the longitudinal direction of the branch pipe.

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