JP2010007511A - Intake noise amplifying device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an intake noise amplifying device making a driver feel actually sufficient sporty feeling when accelerating a vehicle. <P>SOLUTION: This intake noise amplifying device 6 includes a hollow communication pipe 7 arranged in the middle of the intake duct 3 of an engine 2 and branched from the intake duct 3, a hollow additional pipe 8 provided at the open end 7A of the communication pipe 7, and an elastic film 9 arranged between the communication pipe 7 and the additional pipe 8, amplifies intake pulsation of the engine 2 by using resonances of the communication pipe 7, additional pipe 8 and elastic film 9, and emits the amplified noise from the open end 8A of the additional pipe 8 to the outside. The open end 8A of the additional pipe 8 is formed with a flat end surface 8B perpendicular to the central shaft of the additional pipe 8 and an inclined end surface 8C inclined to the central shaft. The inclined end surface 8C is formed in a position more separated from the elastic film 9 than the flat end surface 8B. In the additional pipe 8, a ratio of sidewall length from the elastic film 9 to the flat end surface 8B to sidewall length from the elastic film 9 to the most distal end of the inclined end surface 8C is set to 1:1.2-1.3 and a ratio of the opening area of the flat end surface 8B to the opening area of the inclined end surface 8C is set to 3:2. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an intake sound amplifying apparatus that allows a driver to experience a sporty engine sound during vehicle acceleration by actively guiding engine intake sound into a vehicle interior.

  As a conventional intake sound amplifying device, a communication pipe provided in the middle of the intake duct of the engine and branched from the intake duct, an additional pipe provided on the open end side of the communication pipe, and the communication pipe and the additional pipe And an elastic membrane provided to increase the intake pulsation of the engine using the resonance of the communication tube, the additional tube, and the elastic membrane, and to release to the outside from the open end of the additional tube. (For example, refer to Patent Document 1).

In Patent Document 1, two intake sound amplifying devices are attached in parallel to the intake duct. That is, in Patent Document 1, two types of additional pipes having different lengths are prepared, one long intake pipe is connected to a long communication pipe, and the other intake pipe An additional pipe having a short length is connected to the communication pipe. When the additional pipes having different lengths are connected in this way, engine sounds having different resonance frequencies can be obtained during vehicle acceleration, and the driver can drive the car with a sporty feeling.
JP 2006-217552 A

  However, the above-described conventional technique has a drawback in that a sufficient sporty feeling cannot be obtained because there are too few types of resonance frequencies that produce an acceleration feeling. That is, the resonance frequency that produces an acceleration feeling is determined by the length of the additional tube. However, in Patent Document 1, only two types of additional tubes are prepared, and a wide frequency band for the resonance frequency cannot be covered. For this reason, it is difficult for the driver to realize a sufficient sporty feeling during vehicle acceleration.

  If various types of additional pipes with different lengths are prepared and each additional pipe is connected to the communication pipe, and each of the communication pipes after the connection is attached in parallel to the intake duct, the resonance frequency will be reduced. It is possible to cover a wide frequency band, but this is not practical because the installation space for the intake sound amplifying device becomes large.

  An object of the present invention is to provide an intake sound amplifying device that allows a driver to feel a sufficient sportiness when accelerating a vehicle without taking up an installation space.

  In order to solve the above-mentioned problems, the feature of the present invention is that a wide frequency band about the resonance frequency can be covered with one type of additional pipe by devising the shape of the open end of the additional pipe. is there. That is, the present invention provides a hollow communication pipe provided in the middle of an intake duct of an engine and branched from the intake duct, a hollow additional pipe provided on an open end side of the communication pipe, the communication pipe, and the additional An elastic membrane disposed between the communication pipe and the additional pipe to cut off the communication between the additional pipe and the intake pulsation of the engine using resonance of the communication pipe, the additional pipe, and the elastic membrane. An intake sound amplifying device for increasing the sound and releasing it from the open end of the additional pipe to the outside, wherein the open end of the additional pipe has a flat portion end surface perpendicular to the central axis of the additional pipe; An inclined portion end surface inclined with respect to a central axis, and the inclined portion end surface is formed at a position farther from the elastic film than the flat portion end surface, and the additional pipe is formed from the elastic film Side wall length to the flat part end surface and the inclined part from the elastic film The ratio of the side wall length to the forefront of the surface is set to 1: 1.2 to 1.3, and the ratio of the opening area of the flat part end face to the opening part of the inclined part end face is set to 3: 2. It is characterized by being.

  According to the present invention, the distance from the elastic membrane to the open end of the additional pipe is constant in the portion where the flat portion end surface is provided, but is not constant in the portion where the inclined portion end surface is provided, and continuously varies. is doing. As a result, even if only one type of resonance frequency can be obtained at the portion where the flat portion end surface is provided, many types of resonance frequencies can be obtained at the portion where the inclined portion end surface is provided. Without taking too much, the driver can hear a continuous engine sound when accelerating the vehicle and feel a sense of sportiness.

  Moreover, in the present invention, the ratio of the side wall length from the elastic film to the flat part end face and the side wall length from the elastic film to the tip of the inclined part end face is set to 1: 1.2 to 1.3 in the present invention. In addition, since the ratio of the opening area of the flat part end face to the opening part of the inclined part end face is set to 3: 2, the intake sound is harmonized and the driver can feel a comfortable acceleration feeling. It becomes.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a schematic plan view of an engine room in which an intake sound amplifying device according to the present invention is installed. The lower part of the figure shows the front side of the vehicle, and the upper part shows the side of the passenger compartment.

  As shown in FIG. 1, an engine 2 is installed horizontally in the engine room 1, and an intake duct 3 is attached to the engine 2. In the intake duct 3, an air cleaner 4 is attached to an attachment portion 3 </ b> B opposite to the attachment portion 3 </ b> A to the engine 2. The air cleaner 4 has a cleaner element 4A therein.

  An air guide duct 5 is attached to the air cleaner 4 on the opposite side of the attachment portion 3B with the cleaner element 4A interposed therebetween. An open end 5 </ b> A for introducing outside air is formed at the front end of the external guide duct 5, and the open end 5 </ b> A is fixed to the front portion of the engine room 1.

  An intake sound amplifying device 6 is attached to the side wall of the intake duct 3. The intake sound amplifying device 6 is provided in the middle of the intake duct 3, that is, between the attachment portion 3A and the attachment portion 3B, on the hollow communication pipe 7 branched from the intake duct 3, and on the open end 7A side of the communication pipe 7. A hollow additional pipe 8 provided and an elastic membrane 9 disposed between the communication pipe 7 and the additional pipe 8 and blocking communication between the communication pipe 7 and the additional pipe 8 are provided. Then, the intake sound amplifying device 6 increases the intake pulsation of the engine 2 by using the resonance of the communication pipe 7, the additional pipe 8 and the elastic film 9, and releases it from the open end 8 </ b> A of the additional pipe 8 to the outside. It has become.

  The communication pipe 7 and the additional pipe 8 are formed of cylindrical bodies of the same size, and the elastic membrane 9 is formed in a circular shape that matches the communication pipe 7 and the additional pipe 8. The elastic membrane 9 is provided perpendicular to the central axes of the communication pipe 7 and the additional pipe 8.

  In this embodiment, the open end 8A of the additional pipe 8 is provided with a flat end face 8B perpendicular to the central axis of the additional pipe 8 and an inclined end face 8C inclined with respect to the central axis of the additional pipe 8. It has been. The inclined portion end surface 8C is formed at a position farther from the elastic film 9 than the flat portion end surface 8B. That is, the distance between the inclined portion end surface 8C and the elastic film 9 is set to be larger than the distance between the flat portion end surface 8B and the elastic film 9.

  In this embodiment, the additional pipe 8 is arranged so that the inclined portion end surface 8C faces the driver, that is, the perpendicular N of the inclined portion end surface 8C faces the driver. In FIG. 1, reference numeral 10 denotes a steering wheel.

  Here, the configuration of the intake sound amplifying device 6 will be described in detail with reference to FIG. As shown in FIG. 2, the additional pipe 8 has a ratio of the side wall length L1 from the elastic film 9 to the flat portion end surface 8B and the side wall length L2 from the elastic film 9 to the tip of the inclined portion end surface 8C is 1. : 1.2 to 1.3. Further, in the additional pipe 8, the ratio of the opening area M1 of the flat part end face 8B and the opening area M2 of the inclined part end face 8C is set to 3: 2. In addition, when the additional pipe 8 is viewed from the side, the inclined portion end face 8C has a straight line shape (a straight line that rises to the right in FIG. 2).

  In this embodiment, as shown in FIGS. 3 and 4, when the air box 12 is provided on the upper portion of the dash panel 11 that separates the engine room 1 and the vehicle interior 20, the end face of the inclined portion of the additional pipe 8 is provided. The additional pipe 8 is arranged so that the perpendicular line N of 8C (see FIG. 4) faces the air box 12. In FIG. 3, 13 is a hood that covers the engine room 1, 14 is an insulator attached to the surface of the dash panel 11 (engine room 1 side surface), and 15 is a windshield.

  Next, the operation of the intake sound amplifying device 6 according to this embodiment will be described.

  When the engine 2 is rotating, an intake pulsation is generated inside the intake duct 3 by driving an inlet valve (not shown) of the engine 2, and this intake pulsation is divided into the communication pipe 7, the additional pipe 8, and the elastic film 9. The sound is increased by utilizing the resonance of, and the increased sound is emitted from the open end 8A of the additional pipe 8 toward the driver.

  In this case, the open end 8A of the additional tube 8 is provided with a flat portion end surface 8B perpendicular to the central axis of the additional tube 8 and an inclined portion end surface 8C inclined with respect to the central axis of the additional tube 8. Therefore, the distance from the elastic film 9 to the open end 8A (the distance along the central axis of the additional tube 8) is constant in the portion where the flat portion end surface 8B is provided, but the inclined portion end surface 8C is provided. The part is not constant but changes continuously. That is, as shown in FIG. 2, the side wall length of the additional tube 8 is constant at L1 in the portion where the flat portion end surface 8B is provided, but the portion of the additional tube 8 is provided in the portion where the inclined portion end surface 8C is provided. The side wall length continuously increases from the shortest L1 to the longest L2.

  For this reason, as shown in FIG. 5, only one type of resonance frequency can be obtained at the portion where the flat portion end surface 8B is provided, but many types of resonance frequencies can be obtained at the portion where the inclined portion end surface 8C is provided. It becomes possible. As a result, the driver can experience the continuity of engine sound during vehicle acceleration, thereby realizing a sporty feeling during vehicle driving.

  Further, the volume increase by the portion provided with the flat portion end surface 8B (referred to as volume increase at the flat portion end surface) and the sound increase by the portion provided with the inclined portion end surface 8C (referred to as volume increase at the inclined portion end surface) were added. The total volume increase is a curve as shown in the figure.

  In this embodiment, the resonance frequency is set to fall within the range of 260 to 400 Hz. The resonance frequency 260 Hz is due to the portion where the inclined portion end surface 8C is provided, and the resonance frequency 400 Hz is due to the portion where the flat portion end surface 8B is provided. It should be noted that the frequency band to be increased mainly is in the range indicated by the arrow A, and in this range, a sufficient total increase in sound volume is obtained in this embodiment.

  In addition, in this embodiment, the additional pipe 8 has a ratio of the side wall length L1 from the elastic film 9 to the flat part end face 8B and the side wall length L2 from the elastic film 9 to the tip of the inclined part end face 8C is 1. Since the ratio of the opening area M1 of the flat part end face 8B and the opening area M2 of the inclined part end face 8C is set to 3: 2, the intake sound is harmonized. The driver can experience a comfortable acceleration feeling.

  According to the present embodiment, since the additional pipe 8 is arranged so that the perpendicular line N of the inclined portion end surface 8C faces the driver side, it is possible to efficiently let the driver hear the increased engine sound.

  Further, since the additional pipe 8 is arranged so that the perpendicular N of the inclined portion end face 8C faces the air box 12, the engine sound radiated from the open end 8A of the additional pipe 8 is blocked by the insulator 14 on the surface of the dash panel 11. It can be avoided.

  FIG. 6 shows a second embodiment. In the intake sound amplifying device 6 of this embodiment, a flat portion end surface 8E is provided at the center of the open end 8D of the additional pipe 8, and inclined portion end surfaces 8F and 8G are provided on both sides of the flat portion end surface 8E. .

  In the intake sound amplifying device 6 of the present embodiment, the additional pipe 8 includes the side wall length L3 from the elastic film 9 to the flat part end face 8E, and the side walls from the elastic film 9 to the tip of the inclined part end faces 8F and 8G. The ratio with the lengths L4 and L5 (L4 = L5) is set to 1: 1.2 to 1.3. Further, in the additional pipe 8, when the opening area of the flat end face 8E is M3 and the opening areas of the inclined end faces 8F and 8G are M4 and M5, respectively, the ratio of M3 and (M4 + M5) is set to 3: 2. Has been. When the additional tube 8 is viewed from the side, the inclined portion end face 8F is linear (in FIG. 6, a straight line with a downward slope to the right), and the inclined portion end face 8G is also linear (in FIG. 6, a straight line with the upward direction to the right). Is made.

  In this embodiment, as shown in FIG. 7, the additional pipe 8 is arranged so that the central axis S of the additional pipe 8 faces the driver.

  Also in this embodiment, as shown in FIGS. 3 and 4, when the air box 12 is provided on the upper portion of the dash panel 11, the central axis S (see FIG. 7) of the additional pipe 8 is the air box 12. It is preferable to arrange the additional tube 8 so as to face the direction.

  Next, the operation of the intake sound amplifying device 6 according to this embodiment will be described.

  Since the open end 8D of the additional tube 8 is provided with a flat end face 8E and inclined end faces 8F and 8G on both sides thereof, the distance from the elastic film 9 to the open end 8D is not constant and varies. ing. That is, the side wall length of the additional tube 8 is constant at L3 at the flat end surface 8E, but the side wall length of the additional tube 8 from L3 to L4 at the inclined portion end surface 8F, and the additional tube at the inclined portion end surface 8G. The side wall length of 8 continuously increases from L3 to L5.

  For this reason, as shown in FIG. 8, only one type of resonance frequency can be obtained in the portion where the flat portion end surface 8E is provided, but many types of resonance frequencies are obtained in the portion where the inclined portion end surfaces 8F and 8G are provided. It becomes possible.

  Further, the sound increase by the portion provided with the flat portion end surface 8E (referred to as sound increase at the flat portion end surface) and the sound increase by the portion provided with the inclined portion end surfaces 8F, 8G (referred to as sound increase at the inclined portion end surface). The added total volume increase becomes a curve as shown in the figure.

  Also in this embodiment, the resonance frequency is set to fall within the range of 260 to 400 Hz. The resonance frequency 260 Hz is due to the portion where the inclined portion end surfaces 8F and 8G are provided, and the resonance frequency 400 Hz is due to the portion where the flat portion end surface 8E is provided.

  According to the present embodiment, since the inclined portion end surfaces 8F and 8G are formed on both sides of the flat portion end surface 8E, the sound spread is made uniform, and the driver's sitting position (slider adjustment of the driver seat back and forth is performed). Difference in the way the sound is heard depending on the position when

  In the present embodiment, the additional pipe 8 includes a side wall length L3 from the elastic film 9 to the flat part end face 8E, and a side wall length L4 to L5 from the elastic film 9 to the forefront of the inclined part end faces 8F and 8G. The ratio between the opening area M3 of the flat part end face 8E and the opening area (M4 + M5) of the inclined part end faces 8F and 8G is set to 3: 2. Therefore, the intake sound is harmonized and the driver can experience a comfortable acceleration feeling.

  Furthermore, according to the present embodiment, since the additional pipe 8 is arranged so that the central axis S of the additional pipe 8 faces the driver side, it is possible to efficiently let the driver hear the increased engine sound. is there.

  Further, since the additional pipe 8 is arranged so that the central axis S of the additional pipe 8 faces the air box 12, the sound radiated from the open end 8D of the additional pipe 8 is blocked by the insulator 14 on the surface of the dash panel 11. Can be avoided.

  FIG. 9 shows a third embodiment. In the present embodiment, the inclined portion end surface 8C 'of the additional pipe 8 is not linear but curved. That is, the inclined portion end surface 8C ′ is formed to be concavely curved downward from the flat portion end surface 8B toward the most distal end portion 8C ″ of the additional tube 8. Other configurations are the same as those in the first embodiment. is there.

  Even if comprised in this way, the effect similar to Example 1 can be acquired.

  FIG. 10 shows a fourth embodiment. In the present embodiment, the inclined portion end faces 8F 'and 8G' of the additional tube 8 are not linear but curved. That is, the inclined portion end surface 8F ′ is formed to be concavely curved downward from the flat portion end surface 8E toward the most distal portion 8F ″ of the additional tube 8, and the inclined portion end surface 8G ′ is also formed from the flat portion end surface 8E to the additional tube 8. It is formed to be curved concavely downward toward the most distal portion 8G ″. Other configurations are the same as those in the second embodiment.

  Even if comprised in this way, the effect similar to Example 2 can be acquired.

  Although the embodiments of the present invention have been described in detail with reference to the drawings, each of the above embodiments is only an example of the present invention, and the present invention is not limited only to the configuration of each of the above embodiments. . Needless to say, changes in design and the like within the scope of the present invention are included in the present invention.

  For example, the communication pipe 7 and the additional pipe 8 of the intake sound amplifying device 6 do not have to be cylindrical, and may be a cylinder having a rectangular or polygonal cross section.

It is a schematic plan view in the engine room in which the intake sound amplifying device according to the first embodiment is installed. It is a detailed block diagram of an intake sound amplifying device. It is the figure which showed the positional relationship of the additional pipe and air box of an intake sound amplifying device. It is a perspective view of the open end side of an additional pipe. FIG. 2 is a diagram illustrating the effect of the intake sound amplifying device of FIG. 1 and illustrating the relationship between frequency and sound pressure level. FIG. 6 is a detailed configuration diagram of an intake sound amplifying device according to Embodiment 2. It is a schematic plan view in the engine room in which the intake sound amplifying device of FIG. 6 was installed. FIG. 7 is a diagram illustrating the effect of the intake sound amplifying device of FIG. 6 and illustrating the relationship between frequency and sound pressure level. FIG. 6 is a detailed configuration diagram of an intake sound amplifying device according to Embodiment 3. FIG. 10 is a detailed configuration diagram of an intake sound amplifying device according to Embodiment 4;

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Engine room 2 Engine 3 Intake duct 4 Air cleaner 6 Intake sound increaser 7 Communication pipe 7A Open end 8 Additional pipe 8A Open end 8B, 8E Flat part end face 8C, 8F, 8G Inclined part end face 8C ', 8F', 8G 'Inclination Part end face 9 Elastic film L1, L2, L3, L4, L5 Side wall length M1, M2, M3, M4, M5 Opening area N Perpendicular of inclined part end face S Central axis of additional pipe

Claims (5)

A hollow communication pipe provided in the middle of the intake duct of the engine and branched from the intake duct, a hollow additional pipe provided on the open end side of the communication pipe, and a space between the communication pipe and the additional pipe. Provided with an elastic membrane that blocks communication between the communication pipe and the additional pipe, and increases the intake air pulsation of the engine using resonance of the communication pipe, the additional pipe, and the elastic membrane, An intake sound amplifying device that discharges from the open end of the additional pipe to the outside,
The open end of the additional tube is provided with a flat portion end surface perpendicular to the central axis of the additional tube and an inclined portion end surface inclined with respect to the central axis, and the inclined portion end surface is flat with the flat surface. It is formed at a position farther from the elastic film than the end face of the part,
In the additional pipe, a ratio of a side wall length from the elastic film to the flat part end surface and a side wall length from the elastic film to the tip of the inclined part end surface is set to 1: 1.2 to 1.3. And the ratio of the opening area of the said flat part end surface and the opening area of the said inclination part end surface is set to 3: 2, The intake sound increasing apparatus characterized by the above-mentioned.   2. The intake air according to claim 1, wherein the flat portion end surface and the inclined portion end surface are each formed one by one, and the additional pipe is arranged so that a perpendicular of the inclined portion end surface faces a driver side. Sound increaser.   When the engine is disposed in an engine room and an air box is provided on an upper part of a dash panel that separates the engine room and the vehicle interior, the additional pipe is arranged so that a perpendicular of the end face of the inclined portion faces the air box. The intake sound amplifying device according to claim 2, wherein the intake sound amplifying device is disposed.   The additional portion is formed such that the flat portion end surface is formed at the center of the open end of the additional pipe, and the inclined portion end surfaces are formed on both sides of the flat portion end surface, respectively, and the central axis of the additional pipe faces the driver side. 2. The intake sound amplifying device according to claim 1, wherein a pipe is disposed.   When the engine is disposed in the engine room and an air box is provided on an upper part of a dash panel that separates the engine room and the vehicle interior, the additional pipe is arranged so that a central axis of the additional pipe faces the air box. The intake sound amplifying device according to claim 4, wherein the intake sound amplifying device is disposed.

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