JP2010007510A - 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 provided in an engine room 1 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 and shutting off communication between the communication pipe 7 and the additional pipe 8, amplifies 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 emits 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 into a single inclined surface 8B having a short-side sidewall and a long-side sidewall along the central shaft of the additional pipe 8 in a longitudinal direction, and the additional pipe 8 is so arranged that the short-side sidewall of the single inclined surface 8B is opposed to the upper portion of a dash panel 11 isolating the engine room 1 from the inside of a cabin. <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 an intake duct of an engine arranged in an engine room, branched from the intake duct, an additional pipe provided on the open end side of the communication pipe, and a communication pipe And an elastic membrane provided between the additional pipe and the engine to increase the intake pulsation of the engine using the resonance of the communication pipe, the additional pipe, and the elastic membrane, and release it from the open end of the additional pipe to the outside Is known (see, for example, 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, 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 connection pipes after the connection is provided in parallel with 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.

  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 that is provided in the middle of an intake duct of an engine disposed in an engine room and branches from the intake duct, and a hollow additional pipe that is provided on the open end side of the communication pipe. An elastic membrane disposed between the communication pipe and the additional pipe and blocking communication between the communication pipe and the additional pipe, and the intake pulsation of the engine is controlled by the communication pipe, the additional pipe, and the An intake sound amplifying device that uses a resonance of an elastic membrane to increase sound and discharges the additional tube from the open end to the outside, wherein the open end side of the additional tube extends along the central axis in the longitudinal direction of the additional tube The short side wall is formed into a single slope having a short side wall and a long side wall, and the short side wall of the single slope is opposed to an upper portion of a dash panel that separates the engine room and the vehicle interior. It is characterized by the arrangement of tubes.

  According to the present invention, the open end side of the additional pipe is formed into a single slope having a short side wall and a long side wall along the longitudinal central axis of the additional pipe. Since the additional pipe is arranged so that the side wall faces the upper part of the dash panel that separates the engine room and the vehicle interior, the distance from the elastic membrane to the open end of the additional pipe (along the central axis of the additional pipe) The distance) is not constant, and is continuously long from the long side wall to the short side wall. As a result, various types of resonance frequencies can be obtained, and the driver can feel a sufficient sportiness when accelerating the vehicle.

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

  FIG. 1 is a schematic view of an interior of an engine room 1 in which an intake sound amplifying device according to the present invention is installed.

  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 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 the present embodiment, the open end 8A side of the additional pipe 8 is cut obliquely with respect to the central axis of the additional pipe 8, and a single slope is formed at the open end 8A. This single slope is called a slash surface 8B. The additional pipe 8 is formed with a slash surface 8B, so that the side wall on the short side of the length L1 (see FIG. 2) and the long side of the length L2 (see FIG. 2) along the central axis in the longitudinal direction. And a side wall. And the additional pipe | tube 8 is arrange | positioned so that the said short side wall may oppose the upper part of the dash panel 11 which isolates the engine room 1 and a vehicle interior.

  In particular, in the present embodiment, the additional pipe 8 is arranged so that the slash surface 8B faces the driver, that is, the perpendicular N of the slash surface 8B 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, a slash surface 8 </ b> B that is a single slope is formed at the open end 8 </ b> A of the additional pipe 8. And the additional pipe | tube 8 is formed so that ratio of the length L1 of the short side wall along the central axis and the length L2 of the long side wall may be set to 1: 1.2-1.3. Yes.

  Further, 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 vertical line N (see FIG. 4) of the slash surface 8 </ b> B of the additional pipe 8 is the air. An additional tube 8 is arranged to face the 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, since the open end 8A side of the additional tube 8 is a slash surface 8B that is a single slope, the distance from the elastic film 9 to the slash surface 8B (the distance along the central axis of the additional tube 8) is It is not constant, and continuously increases from the length L1 of the short side wall to the length L2 of the long side wall (see FIG. 2 for L1 and L2).

  When the distance from the elastic film 9 to the slash surface 8B is continuously increased, as shown in FIG. 5, there are many gaps between the short side wall of the length L1 and the long side wall of the length L2. Various resonance frequencies can be obtained. As a result, a sense of continuity of sound can be considered during vehicle acceleration, and the driver can feel a sufficient sporty feeling.

  In FIG. 5, the rightmost graph shows that the resonance frequency is 400 Hz near the short side wall of length L1, and the leftmost graph shows resonance near the long side wall of length L2. The frequency is 260 Hz, respectively. Several resonance frequencies appear between 260 and 400 Hz. By increasing these resonance frequencies, it becomes possible for the driver to feel a continuity of sound during vehicle acceleration. ing.

  According to the present embodiment, since the additional pipe 8 is arranged so that the perpendicular line N of the slash surface 8B faces the driver side, the increased sound can be efficiently heard by the driver.

  Further, since the additional pipe 8 is arranged so that the perpendicular line N of the slash surface 8B faces the air box 12, the 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. Can be avoided.

  Furthermore, according to the present embodiment, the additional pipe 8 is formed so that the ratio of the length L1 of the short side wall to the length L2 of the long side wall is 1: 1.2 to 1.3. Therefore, in an inline 3-cylinder, in-line 4-cylinder, in-line 6-cylinder, V-type 6-cylinder, and V-type 8-cylinder engine, it is possible to continuously increase the frequency band necessary for a feeling of acceleration.

  FIG. 6 shows a second embodiment. In the present embodiment, a reflecting plate 20 that reflects sound is provided in front of the open end 8A of the additional tube 8.

  In the present embodiment, the open end 7A side of the communication pipe 7 and the additional pipe 8 are arranged in a direction away from the driver, that is, close to the engine 2, and the perpendicular line N of the slash surface 8B of the additional pipe 8 is It cannot be directed directly to the driver.

  In such a case, by providing the reflecting plate 20 in front of the open end 8A of the additional pipe 8, the sound emitted from the open end 8A of the additional pipe 8 is reflected by the reflecting plate 20 and then told to the driver. Can do. Therefore, in the present embodiment, the additional pipe 8 and the reflecting plate 20 are arranged so that the perpendicular N of the slash surface 8B is reflected by the reflecting plate 20 and then faces the driver. Other configurations are the same as those in the first embodiment.

  The present embodiment is effective when some parts are installed at the rear of the engine room 1 and the intake sound amplifying device 6 (especially the additional pipe 8) cannot be laid out freely.

  Also in this embodiment, as in the case of FIG. 3, it is preferable to arrange the additional tube 8 and the reflecting plate 20 so that the perpendicular N of the slash surface 8B is reflected by the reflecting plate 20 and then faces the air box 12.

  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 the schematic in the engine room in which the intake sound amplifying device by Example 1 was 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. 3 is a diagram illustrating the effect of the intake sound amplifying device of FIG. 2 and illustrating the relationship between frequency and sound pressure level. It is the schematic in the engine room in which the intake sound amplifying device by Example 2 was installed.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Engine room 2 Engine 3 Intake duct 4 Air cleaner 6 Intake sound increase device 7 Communication pipe 7A Open end 8 Additional pipe 8A Open end 8B Slash surface (single slope)
9 Elastic membrane 11 Dash panel 12 Air box 14 Insulator 20 Reflector L1 Length of short side wall L2 Length of long side wall N perpendicular

Claims (5)

A hollow communication pipe provided in the middle of the intake duct of the engine disposed in the engine room and branched from the intake duct, a hollow additional pipe provided on the open end side of the communication pipe, the communication pipe, and the An elastic membrane disposed between the additional pipe and the communication pipe and blocking the communication between the additional pipe and the intake pulsation of the engine using the resonance of the communication pipe, the additional pipe, and the elastic membrane An intake sound amplifying device that increases the sound and releases the additional pipe from the open end to the outside,
The open end side of the additional pipe is formed into a single slope having a short side wall and a long side wall along the longitudinal central axis of the additional pipe, and the short side wall of the single slope is the An intake sound amplifying device, wherein the additional pipe is arranged so as to face an upper part of a dash panel that separates an engine room and a vehicle interior.   2. The intake sound amplifying device according to claim 1, wherein, when an air box is provided at an upper portion of the dash panel, the additional pipe is arranged so that a perpendicular of the single slope faces the air box.   The intake sound amplifying device according to claim 1 or 2, wherein the additional pipe is arranged so that the perpendicular of the single slope faces the driver side.   The said additional pipe | tube is formed so that ratio of the length of the said short side wall and the length of the said long side wall may be set to 1: 1.2-1.3. 2. The intake sound amplifying device according to 2 or 3.   The intake sound amplifying device according to any one of claims 1 to 4, wherein a reflection plate that reflects sound toward a driver is provided in front of an open end of the additional pipe.

Images