JP2009132300A - Exhaust sound derivation structure of automobile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an exhaust sound derivation structure of an automobile to obtain sound feeling of exhaust sound at low cost and without increasing exhaust sound volume of an exhaust pipe itself. <P>SOLUTION: This structure is provided with a ventilation duct 13 provided on a vehicle body of the automobile 10 to communicate the vehicle body outside with the vehicle body inside, a through-hole 21 formed on a wall part for defining the ventilation duct 13, and a lid 22 openably/closably mounted in the through-hole 21 to be opened at only an acceleration time of the automobile 10. The lid 22 is opened at the acceleration time of the automobile 10 to lead the exhaust sound generated in the exhaust pipe at the vehicle body outside to the vehicle body inside via the ventilation duct 13. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an exhaust sound derivation structure for an automobile in which exhaust sound during acceleration of the automobile is introduced into the passenger compartment to produce a sound feeling during acceleration.

  In general, exhaust sound generated from an exhaust pipe (muffler) of an automobile is regulated as noise outside the vehicle, and this regulation standard has become stricter in recent years. Regulation standards are particularly strict in Japan and Europe.

  On the other hand, sports-type automobiles tend to produce a feeling of sound by increasing the exhaust volume particularly during acceleration. Conventionally, the exhaust volume has been increased by changing the structure of the exhaust pipe.

  However, due to the above-mentioned regulations on outside noise, when the same automobile is exported to Europe and the United States, there is a request for cost reduction, and both Europe and the United States regulation standards are met by one kind of exhaust pipe. I am doing so. For this reason, the sound feeling is poor with respect to the exhaust sound during acceleration.

  Further, when the exhaust volume is increased by changing the exhaust pipe structure, the muffled noise due to the exhaust contribution, particularly the lock-up muffled noise, which can be a problem, is deteriorated. Furthermore, in recent automobiles, CVT is increasingly introduced from the viewpoint of fuel saving, and there is a tendency to lower the lock-up rotation speed. For this reason, the exhaust sound generated in the exhaust pipe has been reduced, and it is difficult to satisfy the above-described demand for sound feeling.

On the other hand, Patent Document 1 discloses an apparatus for noise configuration in a motor vehicle in which sound in an engine intake pipe of an automobile is guided into a hollow body and guided into a vehicle interior via a vibration member. Yes. According to this device, the sound feeling described above can be obtained by guiding the sound of the air flow in the engine intake pipe into the vehicle interior.
JP 2002-364473 A

  However, in the device according to Patent Document 1, since the sound of the air flow in the engine intake pipe is drawn into the vehicle, a sound feeling as when the exhaust volume of the exhaust pipe is increased cannot be obtained. Further, the apparatus according to Patent Document 1 requires a passage such as a pipe that connects the engine intake pipe and the passenger compartment. For this reason, it is necessary to provide a large additional part with respect to the body of an existing automobile, which increases the part cost and the assembly cost.

  The present invention has been made in view of the above points, and an object thereof is to provide an automobile exhaust sound derivation structure that can obtain a sound feeling of exhaust sound without increasing the exhaust volume of the exhaust pipe itself at low cost. .

  According to the first configuration of the present invention, the object is to provide a ventilation duct that is provided in a vehicle body of the automobile and communicates between the outside of the vehicle body and the inside of the vehicle body, and a through-hole formed in a wall portion that defines the ventilation duct. And a lid that can be opened and closed in the through-hole and opens only when the vehicle is accelerated. The lid is opened when the vehicle is accelerated, and exhaust sound generated in the exhaust pipe outside the vehicle body is exhausted through the ventilation duct. This is achieved by an exhaust sound derivation structure for an automobile that leads to the inside of the vehicle body.

  In the exhaust sound derivation structure for an automobile according to the present invention, the lid is preferably made of an elastic material, and the through hole is closed by a restoring force except when the automobile is accelerated.

  In the exhaust sound derivation structure for an automobile according to the present invention, preferably, the lid can be opened from the through hole to the rear side in the longitudinal direction of the automobile, and the lid is opened based on an inertial force acting on the lid when the automobile is accelerated. To do.

  According to the second configuration of the present invention, the above object includes a ventilation duct that is provided in a vehicle body and communicates between the outside of the vehicle body and the inside of the vehicle body, and a flap that closes the ventilation duct so that the ventilation duct can be opened and closed. This is achieved by an exhaust sound derivation structure for an automobile in which the flap is opened only during acceleration and the exhaust sound generated in the exhaust pipe outside the vehicle body is guided to the inside of the vehicle body through the ventilation duct.

  In the exhaust sound derivation structure for an automobile according to the present invention, preferably, a driving means for opening the flap, an acceleration sensor for detecting the acceleration of the automobile, and driving control of the driving means based on an acceleration signal of the acceleration sensor to control the flap. And a control unit to be opened.

  The exhaust sound derivation structure for an automobile according to the present invention preferably includes a drive wire that is linked to the throttle wire of the automobile and the tip is connected to a flap, and the drive wire is linked to the throttle wire during acceleration of the automobile. Open the flap.

  According to the present invention, the outside of the vehicle body and the inside of the vehicle body communicate with each other through the through-hole provided in the ventilation duct or the aeration duct when the lid is opened during acceleration of the automobile. Thereby, the exhaust sound generated in the exhaust pipe during acceleration is guided from the ventilation duct to the inside of the vehicle body through the through hole. Therefore, the passenger in the vehicle can hear a larger exhaust sound by the exhaust sound guided to the inside of the vehicle body.

In this way, since the exhaust sound that can be heard in the vehicle has a louder volume only when the vehicle is accelerated, a sufficient sound feeling can be obtained in the vehicle, particularly in a sports type vehicle that the exhaust volume during acceleration is increased. Can respond to requests.
Since the exhaust sound actually generated in the exhaust pipe does not change, there will be no humming noise or increase in noise outside the vehicle, and the regulations in each country can be satisfied sufficiently. In addition, since the lid is closed during traveling other than during acceleration, the exhaust sound does not enter the quiet vehicle and does not cause discomfort to the passengers. For example, by using a ventilation duct provided near the side surface of an existing rear bumper, it is possible to produce a sound feeling at low cost.

  Hereinafter, the present invention will be described in detail based on the embodiments shown in the drawings. In the figure, Fr indicates the front of the vehicle, Up indicates the upper side of the vehicle, and RH indicates the right side in the vehicle width direction.

[First embodiment]
FIG. 1 shows the overall configuration of an automobile including an exhaust sound derivation structure according to the first embodiment of the present invention.
In FIG. 1, an automobile 10 is provided with a vent 11 for introducing air on the front side of the passenger compartment and a vent 12 for discharging air on the rear side of the passenger compartment to ventilate the passenger compartment. A ventilation duct 13 is provided at the rear of the vehicle body. Further, the automobile 10 is provided with a cold or warm air outlet 14 by an air conditioner on the front side of the passenger compartment, and the cold air or the warm air introduced into the passenger compartment from these outlets 14 is similarly vented from the vent 12 to the ventilation duct 13. It is discharged out of the vehicle through.

  In the illustrated case, the ventilation duct 13 is provided on the rear side surface of the vehicle 10, that is, on the inner side of the side surface of the rear bumper cover 15, and is configured to communicate the inner side of the vehicle body with the outer side of the vehicle body. Here, the ventilation duct 13 is provided with a flap 13a that can be opened and closed on the lower wall portion, as shown in FIG. The flap 13a is pushed by the air flow when an air flow flows from the inside of the vehicle body to the outside of the vehicle body to open the ventilation duct 13, and closes the ventilation duct 13 when there is no such air flow.

Here, the ventilation duct 13 includes an exhaust sound derivation structure 20 according to the present invention.
As shown in FIG. 2, the exhaust sound derivation structure 20 includes a through hole 21 provided in the rear side wall 13 b of the ventilation duct 13 and a lid 22 that closes the through hole 21 so that the through hole 21 can be opened and closed. . The lid 22 is made of an elastic material, for example, a rubber plate, and closes the through hole 21 as shown in FIG. 3 (A) based on the elasticity, and the rear of the automobile as shown in FIG. 3 (B). Elastically deforms toward the side. Therefore, the lid 22 is elastically deformed backward by an inertial force only when the automobile is accelerated to open the through hole 21.

  The exhaust sound derivation structure 20 according to the first embodiment of the present invention is configured as described above. When the vehicle is not accelerated, the lid 22 is based on its elasticity as shown in FIG. The through hole 21 is closed. As a result, exhaust noise generated in the exhaust pipe (not shown) does not enter the vehicle body through the ventilation duct 13 and the through hole 21. Therefore, in the passenger compartment, the exhaust sound volume does not increase due to the exhaust sound entering the vehicle through the through hole 21, so that the passenger does not feel uncomfortable due to the large exhaust sound volume.

  On the other hand, when the automobile is accelerated, the lid 22 is elastically deformed rearward and opens the through hole 21 as shown in FIG. Therefore, the exhaust sound at the time of acceleration generated in the exhaust pipe of the automobile 10 enters the ventilation duct 13 from the outside of the vehicle body and is guided to the inside of the vehicle body through the open through hole 21 of the ventilation duct 13. Thereby, the passenger | crew in a vehicle interior can hear the exhaust sound guide | induced to the vehicle body inner side from the through-hole 21 of this ventilation duct 13. FIG. At this time, the exhaust sound in the passenger compartment is added with the exhaust sound guided to the inside of the vehicle body from the through-hole 21 of the ventilation duct 13 described above as compared with the conventional sound volume, and the sound volume becomes larger. Therefore, particularly in a sports-type automobile, a sound feeling can be obtained by increasing the exhaust volume in the vehicle during acceleration. In this case, since the ventilation duct 13 is disposed inside the rear bumper cover 15, the ventilation duct 13 is disposed near the exhaust pipe, and the exhaust sound generated in the exhaust pipe is more effectively guided to the inside of the vehicle body. become.

At this time, the exhaust noise actually generated in the exhaust pipe does not change and does not increase, so there is no humming noise or increased outside noise. Can be fully satisfied.
Further, since the through hole 21 is closed by the lid 22 except when the automobile 10 is accelerated, no exhaust sound enters the vehicle body through the through hole 21. Therefore, the passenger does not feel uncomfortable with the loud exhaust sound.

  In this case, since the drive mechanism for opening the lid 22 during acceleration is unnecessary, the exhaust sound derivation structure 20 can be configured at a low cost with a simple configuration.

[Second Embodiment]
FIG. 4 shows the configuration of the second embodiment of the exhaust sound derivation structure for an automobile according to the present invention.
In FIG. 4, the exhaust sound derivation structure 30 includes a driving means 31 for opening the flap 13 a for the ventilation duct 13 of the automobile 10 shown in FIG. 1 and an acceleration sensor provided on the vehicle body side of the automobile 10. 32 and a control unit 33 that drives and controls the driving means 31 based on an acceleration signal from the acceleration sensor 32.

  In the illustrated case, the driving means 31 is a plunger, and a movable portion 31a is attached to the tip of the flap 13a as shown in detail in FIG. Thereby, when the movable part 31a moves upward, the tip of the flap 13a also moves upward to open the ventilation duct 13.

  The acceleration sensor 32 is attached to an arbitrary part of the vehicle body of the automobile 10 and detects acceleration when the automobile 10 is accelerated. The acceleration sensor 32 outputs an acceleration signal corresponding to the acceleration of the automobile 10.

  As shown in FIG. 6, the control unit 33 drives and controls the drive unit 31 by outputting a control signal to the drive unit 31 based on the acceleration signal from the acceleration sensor 32. Thereby, the control part 33 operates the drive means 31, for example, when acceleration is more than a threshold value, and opens the flap 13a. The control unit 33 moves the movable unit 31a of the driving unit 31 according to the acceleration signal from the acceleration sensor 32, and adjusts the opening amount of the flap 13a stepwise or continuously in accordance with the acceleration. It may be.

  According to the exhaust sound derivation structure 30 for a vehicle having such a configuration, the flap 13a closes the ventilation duct 13 when the vehicle is not accelerated. Thereby, the exhaust sound generated in the exhaust pipe (not shown) does not enter the vehicle body from the ventilation duct 13. Therefore, in the passenger compartment, the exhaust volume does not increase due to the exhaust sound entering the vehicle from the ventilation duct 13, so that the passenger does not feel uncomfortable due to the large exhaust volume.

  On the other hand, when the vehicle is accelerated, the acceleration sensor 32 detects the acceleration and outputs an acceleration signal to the control unit 33. Therefore, the control unit 33 controls the driving unit 31 based on the acceleration signal. Accordingly, in the driving means 31, the movable portion 31a moves upward to move the tip of the flap 13a upward. As a result, the ventilation duct 13 is opened, and the exhaust sound during acceleration generated in the exhaust pipe of the automobile 10 is guided from the outside of the vehicle body to the inside of the vehicle body from the ventilation duct 13.

  Accordingly, the passenger in the vehicle compartment can hear the exhaust sound guided from the ventilation duct 13 to the inside of the vehicle body. At this time, the exhaust sound in the vehicle interior becomes a louder volume by adding the exhaust sound guided from the ventilation duct 13 to the inside of the vehicle body as compared with the conventional sound volume. Thereby, the sound feeling at the time of acceleration of the automobile 10 is obtained.

[Third embodiment]
FIG. 7 shows the configuration of the third embodiment of the exhaust sound derivation structure for an automobile according to the present invention.
7, the exhaust sound derivation structure 40 includes a drive wire 41 for opening the flap 13a with respect to the ventilation duct 13 of the automobile 10 shown in FIG.

  In the illustrated case, the drive wire 41 has one end 41 a attached to the accelerator pedal 16 of the automobile 10 in the same manner as the throttle wire 17. Here, the accelerator pedal 16 is supported so as to be swingable around the fulcrum 16a. As a result, when the accelerator pedal 16 is depressed as indicated by an arrow A, the drive wire 41 is pulled in the longitudinal direction as indicated by an arrow B in conjunction with the throttle wire 17.

  The other end 41b of the drive wire 41 is connected from above to the tip of the flap 13a of the ventilation duct 13 described above. Thus, when the accelerator pedal 16 is depressed, the other end 41b of the drive wire 41 pulls the tip of the flap 13a upward.

  According to the exhaust sound derivation structure 40 for a vehicle having such a configuration, the flap 13a closes the ventilation duct 13 because the accelerator pedal 16 is not depressed when the vehicle is not accelerated. Thereby, the exhaust sound generated in the exhaust pipe (not shown) does not enter the vehicle body from the ventilation duct 13. Therefore, in the passenger compartment, the exhaust volume does not increase due to the exhaust sound entering the vehicle from the ventilation duct 13, so that the passenger does not feel uncomfortable due to the large exhaust volume.

  On the other hand, at the time of acceleration of the automobile, when the accelerator pedal 16 is depressed, one end 41a of the drive wire 41 is pulled as indicated by an arrow B, and the other end 41b of the drive wire 41 moves up the tip of the flap 13a. Pull up. As a result, the ventilation duct 13 is opened, and the exhaust sound during acceleration generated in the exhaust pipe of the automobile 10 is guided from the outside of the vehicle body to the inside of the vehicle body from the ventilation duct 13.

  Accordingly, the passenger in the vehicle compartment can hear the exhaust sound guided from the ventilation duct 13 to the inside of the vehicle body. At this time, the exhaust sound in the vehicle interior becomes a louder volume by adding the exhaust sound guided from the ventilation duct 13 to the inside of the vehicle body as compared with the conventional sound volume. Thereby, the sound feeling at the time of acceleration of the automobile 10 is obtained.

The present invention can be implemented in various forms without departing from the spirit of the present invention. For example, the drive means (plunger) 31 or the drive wire 41 is used as the drive means for opening the flap 13a during acceleration. However, the present invention is not limited to this, and other drive means may be used.
Further, in the above-described embodiment, the ventilation duct 13 is provided inside the rear bumper cover 15 close to the place where the exhaust pipe is arranged. Also good.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an overall configuration of an automobile provided with a first embodiment of an automobile exhaust sound derivation structure according to the present invention. FIG. 2 is a schematic perspective view showing a first embodiment of an automobile exhaust sound derivation structure according to the present invention provided in the automobile of FIG. 1. In the exhaust sound derivation structure of the automobile of FIG. 2, (A) is an enlarged perspective view showing when the lid is closed, and (B) is an enlarged perspective view showing when the lid is opened. FIG. 3 is a perspective view similar to FIG. 2 showing a second embodiment of the exhaust sound derivation structure for an automobile according to the present invention. FIG. 5 is an enlarged cross-sectional view in the lateral direction in the exhaust sound derivation structure of the automobile in FIG. 4. It is a block diagram which shows the electric constitution of the exhaust-gas derivation | leading-out structure of the motor vehicle of FIG. It is a perspective view which shows 3rd embodiment of the exhaust-gas derivation | leading-out structure of the motor vehicle by this invention. It is an expanded sectional view of the horizontal direction in the exhaust sound derivation | leading-out structure of the motor vehicle of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Car 11 Ventilation hole 12 Ventilation hole 13 Ventilation duct 13a Flap 13b Side wall 14 Port 15 Rear bumper cover 16 Accelerator pedal 16a Support point 17 Throttle wire 220, 30, 40 Exhaust sound derivation structure 21 Through hole 22 Lid 31 Driving means 31a Movable part 32 Accelerometer 33 Controller 41 Drive wire

Claims (5)

A ventilation duct that is provided in the body of the automobile and communicates between the outside of the vehicle body and the inside of the vehicle body;
A through hole formed in the wall defining the ventilation duct;
A lid that is openably and closably attached to the through-hole, and that opens only when the vehicle is accelerated.
An exhaust sound derivation structure for an automobile in which the lid is opened during acceleration of the automobile and the exhaust sound generated in the exhaust pipe outside the vehicle body is guided to the inside of the vehicle body through the ventilation duct.   The exhaust sound derivation structure for an automobile according to claim 1, wherein the lid is made of an elastic material, and the through hole is closed by a restoring force except when the automobile is accelerated. A ventilation duct that is provided in the body of the automobile and communicates between the outside of the vehicle body and the inside of the vehicle body;
A flap for closing and opening the ventilation duct,
An exhaust sound derivation structure for an automobile in which the flap is opened only when the automobile is accelerated, and exhaust sound generated in an exhaust pipe outside the vehicle body is guided to the inside of the vehicle body through the ventilation duct. Drive means for opening the flap;
An acceleration sensor that detects the acceleration of the car,
The vehicle exhaust sound derivation structure according to claim 3, further comprising: a control unit that controls the driving unit to open the flap based on an acceleration signal of the acceleration sensor. It has a drive wire that is linked to the throttle wire of an automobile and whose tip is connected to the flap,
The exhaust sound derivation structure for an automobile according to claim 3, wherein the drive wire opens the flap in conjunction with the throttle wire when the automobile is accelerated.

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