JP6141662B2 - Intake sound introduction device - Google Patents

Description

  The present invention relates to an intake sound introduction device for adjusting and introducing an intake sound of an engine mounted on a vehicle into a vehicle interior.

  2. Description of the Related Art In recent years, an intake sound introduction device that introduces an intake sound of an engine mounted on a vehicle into a vehicle interior to produce a sporty feeling is known. For example, an intake sound introduction device described in Patent Document 1 (in the literature, an intake sound transmission device for a vehicle) includes a transmission pipe branched from an intake pipe of an engine, and an intake sound that is provided inside the transmission pipe and is transmitted through the transmission pipe. A vibrating body that vibrates due to the intake pulsation, and a resonance pipe that is connected to the downstream end of the transmission pipe and locked so that the cross-sectional area of the passage changes monotonically from the upstream side to the downstream side (in the literature, the resonance body) ).

  The intake sound introduction device can resonate the intake sound at a desired frequency by the resonance tube, and can increase the preferable sound and transmit it to the vehicle interior.

JP 2009-30451 A

  However, the conventional intake sound introduction device cannot reduce unnecessary high-frequency component sounds (for example, engine valve sounds, intake sounds transmitted at high speed, etc.) in the intake sounds. For this reason, an unnecessary sound is mixed with the intake sound transmitted to the vehicle interior, and there is a possibility that a preferable sound cannot be transmitted to the vehicle interior.

  The present invention has been made in view of such problems, and an object of the present invention is to provide an intake sound introduction device that can reduce unnecessary sounds and transmit a preferable sound to the passenger compartment.

In order to achieve the above object, the present invention provides an intake sound introduction device that introduces an intake sound of an engine mounted on a vehicle into a vehicle compartment, by intake pulsation of the intake sound that is branched and transmitted from the intake system of the engine. a vibrating body that vibrates, and sound creator having a housing surrounding the vibrating body, and the communication path for transmitting the vibration of the vibrator to the casing, is provided in the passage from the intake system to the vibrating member A resonator communicating with the passage, and a lead-out path communicating with the communication path, the vibrating body disposed on the intake system side of the lead-out path, the lead-out path, and the housing in the casing A space portion formed between the body and the resonator, and the resonator communicates with a space portion closer to the intake system than the vibrating body in the space portion of the housing and is provided outside the housing. It is characterized by being.

  In addition, the resonator of the present invention is characterized in that it is disposed at a position corresponding to the antinode of vibration formed in the housing by the intake sound.

  As described above, according to the intake sound introduction device according to the present invention, it is possible to provide an intake sound introduction device that has the above-described characteristics and that can reduce unnecessary sound and transmit a preferable sound to the vehicle interior. it can.

1 is a schematic configuration diagram of a side surface side of an intake sound introduction device according to an embodiment of the present invention. The schematic block diagram of the side surface side of the intake sound introduction device concerning other embodiments of the present invention is shown. An explanatory view for explaining an attachment position of a resonator to a case is shown.

  Hereinafter, a preferred embodiment of an intake sound introduction device of the present invention will be described with reference to FIGS.

  The intake sound introduction device 20 is provided in the engine compartment 3 of the vehicle 1 as shown in FIG. 1 (schematic configuration diagram). In the engine chamber 3, an intake pipe 5 for supplying combustion air to the engine EG is connected to the engine EG via an air cleaner EC. One end of the intake pipe 5 is opened and supported at the front end of the engine chamber 3, and the other end of the intake pipe 5 is connected to the engine EG. The intake pipe 5 is formed in a cylindrical shape with synthetic resin or the like. An intake sound introduction device 20 for transmitting intake sound to the driver in the passenger compartment 7 of the vehicle 1 is connected to the downstream side 5 a of the intake pipe 5 from the air cleaner EC.

The intake sound introduction device 20 communicates the branch pipe 21 branched from the intake pipe 5, the sound creator (registered trademark) 30 communicating with the branch pipe 21, and the branch pipe 21 and the interior of the vehicle compartment 7 via the sound creator 30. And a resonator 60 provided in communication with the branch pipe 21. One end of the branch pipe 21 is connected to an opening 5 b provided on the downstream side 5 a of the air cleaner EC of the intake pipe 5, and the other end side of the branch pipe 21 extends to the vehicle compartment 7 side. It is arranged. The branch pipe 21 is formed in a cylindrical shape from synthetic resin or the like.

  The sound creator 30 includes a lead-out pipe 31 connected to an end of the communication pipe 50 on the intake system side, a vibrating body 33 provided at an end of the lead-out pipe 31 on the intake system side, and a casing surrounding the lead-out pipe 31 35. The vibrating body 33 is a synthetic resin or rubber sheet-like vibrating membrane, and vibrates due to the intake pulsation of the intake sound transmitted through the branch pipe 2. The housing 35 is formed in a box shape, and a front hole 35 a is provided on one end side of the housing 35, and a rear hole 35 b is provided on the other end side of the housing 35.

  The end portion of the branch pipe 21 on the vehicle compartment side is connected to the front hole portion 35a in an open state. The rear front hole portion 35b is supported in a state in which the end portion on the passenger compartment side of the lead-out pipe 31 is opened, and the end portion on the intake system side of the lead-out pipe 31 has a predetermined distance on the inner side with respect to the front hole portion 35a. Are opposed to each other. The rear hole 35b is formed in a circular shape that is substantially the same as the outer shape of the outlet pipe 31, and the outlet pipe 31 is inserted into the rear hole 35b so that no sound leaks from the rear hole 35b. A space part 37 surrounded by a housing 35 is formed around the outlet pipe 31. The space portion 37 has such a size that a plurality of frequencies included in sound vibration using the vibration of the vibrating body 33 as a sound source can resonate by air column vibration. The rear hole 35b has a circular shape having substantially the same size as the vibrating body 33, and allows intake pulsation generated from the vibrating body 33 to pass through the communication pipe 50. In addition, the branch pipe 21 and the space part 37 constituting the passage from the intake system to the vibrating body 33 are collectively referred to as a passage 51 hereinafter.

  A resonator 60 is connected to the branch pipe 21 on the intake system side of the vibrating body 33 in the passage 51. The resonator 60 includes a cylindrical neck portion 61 connected to the branch pipe 21, and a body portion 63 that is connected to the other end side of the neck portion 61 and has a space 63a inside and is formed in a box shape. It becomes. In the resonator 60, when an intake sound with a specific frequency hits the resonator 60, the motion of the intake sound becomes intense at the portion of the hole 61 a of the neck 61 and friction loss occurs, and a sound absorption effect centered on the frequency is generated. In the present embodiment, the resonator 60 is formed so as to produce a sound absorbing effect on unnecessary high frequency component sounds (for example, valve sound of the engine EG, intake sound transmitted at high speed, etc.).

  The intake sound introduction device 20 configured as described above generates an intake pulsation having a frequency corresponding to the rotational speed of the engine EG in the intake pipe 5 when outside air is drawn through the intake pipe 5 as the engine EG is driven. . This intake pulsation is transmitted from the intake pipe 5 to the vibrating body 23 through the branch pipe 21 and the space 27. For this reason, the vibrating body 23 vibrates at a frequency corresponding to the rotational speed of the engine EG. Accordingly, in the sound creator 30, sound vibration is generated using the vibration of the vibrating body 23 as a sound source. A plurality of frequencies included in the sound vibration are resonated by the air column vibration of the housing 25 and transmitted to the communication pipe 50.

  Here, the sound of the high frequency component in the sound vibration transmitted to the intake pipe 5 is absorbed by the resonator 60. For this reason, it is possible to eliminate unnecessary high frequency component sounds in the intake sound, such as valve sounds of the engine EG and intake sounds transmitted at high speed. For this reason, since the sound generated from the vibrating body 23 of the sound creator 30 does not include the sound of unnecessary high frequency components, a preferable intake sound can be transmitted into the vehicle compartment 7 through the communication pipe 50.

  Further, since the resonator 60 absorbs the high frequency component of the sound vibration transmitted to the intake pipe 5, the intake sound generated from the vibrating body 23 of the sound creator 30 does not include the high frequency component. For this reason, the strength of the housing 25 of the sound creator 30 can be suppressed, and the strength design of the housing 25 can be facilitated.

  In the above-described embodiment, the case where the resonator 60 is provided in the branch pipe 21 closer to the intake system than the vibrating body 33 is shown. However, as shown in FIG. 2, the resonator is disposed outside the housing 25 of the sound creator 30. 60 may be provided. The housing 25 is formed in a shape that allows high-frequency component sounds to resonate in the space 27. The resonator 60 communicates with the space 27 in the housing 25 on the intake system side of the vibrating body 33.

  The attachment position of the resonator 60 with respect to the housing 25 will be described with reference to FIG. In FIG. 3, for example, the horizontal axis L indicates the length of sound transmission direction of the housing 25. As shown in FIG. 3, the resonator 60 is arranged at a position corresponding to the antinode h of vibration of the respiring intake sound Sk. For this reason, the intake sound Sk resonated by the resonator 60 can be absorbed effectively.

  For this reason, it is possible to reduce unnecessary high-frequency component sounds of the intake sound, such as valve sounds of the engine EG and intake sounds transmitted at a high speed, and the interior of the passenger compartment 7 can be reduced via the communication pipe 50. A preferable intake sound can be transmitted.

  In the above-described embodiment, the branch pipe 21 and the communication pipe 50 are described as having a circular cross section. However, the present invention is not limited to this, and may be any one of a triangular shape, a rectangular shape, and a polygonal shape. .

1 vehicle 5 intake pipe 7 cabin 20 intake sound introducing apparatus 21 branch pipe 30 sound creator 31 outlet pipe 33 vibrating body 35 housing 37 space 50 communicating pipe 51 passage 60 resonator EG engine AC Eakuri Na

Claims (2)

An intake sound introduction device for introducing intake sound of an engine mounted on a vehicle into a vehicle interior,
A sound creator having a vibrating body that vibrates due to an intake pulsation of an intake sound that is branched and transmitted from the intake system of the engine, and a housing that surrounds the vibrating body ;
A communication path for transmitting vibration of the vibrating body to the passenger compartment ;
A resonator provided in a passage from the intake system to the vibrating body, and communicating with the passage;
With
In the casing, there is a lead-out path communicating with the communication path, the vibrator arranged on the intake system side of the lead-out path, and a space portion formed between the lead-out path and the casing. Provided,
The intake sound introduction device according to claim 1, wherein the resonator is provided outside the casing so as to communicate with a space section closer to the intake system than the vibrating body in the space section of the casing . The intake sound introduction device according to claim 1 , wherein the resonator is disposed at a position corresponding to an antinode of vibration formed in the housing by the intake sound.

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