JP2008291775A - Intake sound transmission device for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an intake sound transmission device for a vehicle which effectively transmits a clear engine sound to the vehicle cabin side, and which reduces manufacturing costs by reducing the number of parts. <P>SOLUTION: A transmission pipe 11 is constituted by being divided into a first part 12 on the intake conduit 4B side and a second part 13 connected to the tip of the supporting part 18 of the first part 12 and having an opening toward the cabin. The space between both of the parts 12, 13 is blocked by placing a vibrator 19 between both of the parts 12, 13. The peripheral wall of the first part 12 is formed by a first bellow part 14, and the peripheral wall of the second part 13 on the first part 12 side is formed by a second bellow part 16. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a vehicle intake sound transmission device for transmitting engine intake sound into a vehicle compartment.

  This type of intake sound control device is intended to actively incorporate engine intake sound into the passenger compartment to produce a sporty feeling. For example, the one disclosed in Patent Document 1 is taken as an example. be able to. This device has a resonator connected in the middle of an intake pipe, and a volume chamber is formed inside the resonator. This volume chamber is partitioned from the intake side via a plate-like resonator. The resonance body vibrates with the intake air pulsation in the intake pipe, and the intake sound having a predetermined frequency is emitted to the outside from the opening of the volume chamber. The opening of the resonator is directed to the dash panel of the vehicle so that the tuned engine sound is transmitted into the passenger compartment. However, in this intake sound control device, there is a possibility that the clear engine sound cannot be effectively transmitted because the plate-like resonator is supported in the volume chamber.

On the other hand, an intake sound transmission device as shown in FIG. 10 is well known. This apparatus has a transmission pipe 51 branched from the middle of the intake pipe 50, and an open end 51 a of the transmission pipe 51 is fixedly supported by a through hole 52 a of a dash panel 52. A vibration body 53 that vibrates due to intake air pulsation in the intake pipe 50 is supported inside the transmission pipe 51 via a bottomed bellows cylinder 54. The inside of the transmission pipe 51 is isolated by the bellows cylinder 54 into the intake pipe 50 side and the open end 51a side. When an intake pulsation occurs in the intake pipe 50 as the engine is operated, the vibrating body 53 vibrates and the intake sound is transmitted to the passenger compartment. In this apparatus, since the vibrating body 53 is supported via the bellows cylinder 54, the vibrating body 53 vibrates effectively due to the intake pulsation. For this reason, a clear engine sound is transmitted effectively.
JP 2005-139882 A

  By the way, in the intake sound transmission device shown in FIG. 10, the transmission pipe 51 is constituted by a first portion 55 on the intake pipe 50 side and a second portion 56 on the opening end 51a side. The bellows tube 54 is held at the joint portion with the portion 56. For this reason, in addition to the 1st part 55 and the 2nd part 56, the said intake sound transmission apparatus requires a total of three shaping | molding members of the bellows cylinder 54, and requires three metal molds for shape | molding each. The assembly process becomes complicated. Therefore, the manufacturing cost of the intake sound transmission device shown in FIG. 10 is high.

  The present invention has been made paying attention to such problems existing in the prior art. The object is to provide a vehicle intake sound transmission device that can effectively transmit clear engine sound to the passenger compartment side, and that can reduce the manufacturing cost by reducing the number of parts. is there.

  In order to achieve the above object, the present invention provides a vehicle intake sound transmission device in which a vibration body that vibrates due to intake pulsation is provided inside a transmission pipe branched from an intake pipe of an engine. The vibrator is divided into a first part on the intake pipe side and a second part connected to the tip of the first part and opening toward the outside, and the vibrating body between the first part and the second part The first and second parts were closed by the vibrating body, and at least one peripheral wall of the first and second parts was formed by bellows.

  According to this configuration, the vibrating body effectively vibrates due to the expansion and contraction of the bellows part, and clear engine sound is effectively transmitted to the outside. And since the surrounding wall of the transmission pipe was formed by the bellows part, a bellows member is not required separately from the transmission pipe. Therefore, the number of parts is reduced, the number of necessary molding dies is reduced, and the number of assembly steps is reduced. For this reason, manufacturing cost is reduced.

Further, the present invention is characterized in that the vibrating body is integrally formed with the first part or the second part.
According to this configuration, the number of parts is further reduced. Accordingly, the number of assembly steps is reduced and the manufacturing cost is reduced.

Further, the present invention is characterized in that the first and second parts are separated from each other, and the vibrator is sandwiched between the first and second parts.
According to this configuration, the shape of each member becomes a simple shape such as a cylindrical shape or a flat plate shape, which facilitates manufacture.

  According to this invention, clear engine sound can be effectively transmitted to the passenger compartment side, and the manufacturing cost can be reduced by reducing the number of parts.

(First embodiment)
Next, a first embodiment embodying the present invention will be described with reference to FIGS.
As shown in FIG. 1, the engine chamber 2 in the vehicle 1 is provided with intake pipes 4 </ b> A and 4 </ b> B for supplying combustion air to the engine 3, and an air cleaner 5 is provided in the middle thereof. Further, a silencer resonator 6 is provided in the intake pipe 4A connected to the upstream side of the air cleaner 5. Each intake pipe 4A, 4B is made of synthetic resin. An intake sound transmission device 10 for transmitting intake sound to the driver in the passenger compartment 7 is provided on the downstream side of the air cleaner 5 in the intake pipes 4A and 4B.

  As shown in FIGS. 2 and 3, the intake sound transmission device 10 includes a transmission pipe 11 branched from an intake pipe 4B connected to the downstream side of the air cleaner 5, and an opening end portion 11a thereof has a dash panel (see FIG. 2). 2 is fixedly supported by a through-hole 8a formed in 8 and opens toward the inside of the passenger compartment 7 as an outside. The transmission pipe 11 includes a first portion 12 formed integrally with the intake pipe 4B, and a second portion 13 connected to the tip of the first portion 12 and having the opening end portion 11a.

  The peripheral wall of the first portion 12 is formed by the first bellows portion 14. Further, a flange-shaped first support portion 15 is formed on the outer peripheral edge of the distal end opening of the first portion 12, and the end surface thereof is an annular first contact surface 15a.

  In the second portion 13, the peripheral wall on the first portion 12 side is formed by the second bellows portion 16. A flange-shaped second support portion 17 is formed on the outer peripheral edge of the proximal end opening of the second portion 13, and the end surface thereof is an annular second contact surface 17 a. And the 1st part 12 and the 2nd part 13 are joined by welding the 1st contact surface 15a and the 2nd contact surface 17a mutually.

  A synthetic resin vibrating body 19 that vibrates due to intake air pulsation in the intake pipe 4B is sandwiched between the first support portion 15 and the second support portion 17 joined to each other. The vibration body 19 closes the space between the first portion 12 and the second portion 13. Note that a step portion having a depth corresponding to the thickness of the vibrating body 19 is formed in the second support portion 17, and the vibrating body 19 is fitted to the step portion.

  When outside air is sucked through the intake pipes 4A and 4B as the engine 3 is operated, intake pulsation having a frequency corresponding to the rotational speed of the engine 3 is generated in the intake pipe 4B. The intake pulsation is transmitted to the vibrating body 19 through the first portion 12 of the transmission tube 11. The vibrating body 19 vibrates due to expansion and contraction of the first bellows portion 14 and the second bellows portion 16. For this reason, the vibration of the vibrating body 19 generates air vibration using the intake sound as a sound source in the second portion 13 of the transmission tube 11, and the intake sound is released into the vehicle compartment 7 from the opening end 11 a of the transmission tube 11. Is done.

In the first embodiment, the following effects can be obtained.
(1) The transmission pipe 11 is divided into a first part 12 on the intake pipe 4B side and a second part 13 that is connected to the tip of the support portion 18 and opens toward the passenger compartment 7. , 13 is interposed between the portions 12 and 13 with a vibrating body 19 interposed therebetween. The peripheral wall of the first portion 12 was formed by the first bellows portion 14 and the peripheral wall of the second portion 13 on the first portion 12 side was formed by the second bellows portion 16.

  Therefore, even if the transmission tube 11 has both ends fixed, the vibrator 19 effectively vibrates due to the expansion and contraction of the first bellows portion 14 and the second bellows portion 16. For this reason, a clear engine sound is effectively transmitted to the compartment 7 side. Moreover, since the peripheral walls of the first portion 12 and the second portion 13 are formed by the first bellows portion 14 and the second bellows portion 16, the vibrating body 19 vibrates more effectively, and a clear engine sound is more effectively produced. It is transmitted to the chamber 7 side. As described above, since the peripheral wall of the transmission tube 11 is formed by the first bellows portion 14 and the second bellows portion 16, a bellows member is not required separately from the transmission tube 11. Therefore, the number of parts is reduced, the number of necessary molding dies is reduced, and the number of assembling steps can be reduced. For this reason, manufacturing cost can be reduced.

  (2) The vibrating body 19 was separated from the first portion 12 and the second portion 13 and was sandwiched between the first portion 12 and the second portion 13. Therefore, each shape of the 1st part 12, the 2nd part 13, and the vibrating body 19 can be made into a simple shape like a cylinder shape or flat plate shape, and can be manufactured easily.

(3) The acoustic characteristics can be easily adjusted by setting the number of ridges of the first bellows portion 14 and the second bellows portion 16, the pitch, or the diameter.
(Second Embodiment)
Next, a second embodiment embodying the present invention will be described with reference to FIGS. In each of the embodiments after the second embodiment, the description will focus on the parts that differ from the first embodiment.

  As shown in FIGS. 4 and 5, the first portion 12 of the transmission pipe 11 is bent at a right angle, so that almost the entire transmission pipe 11 extends in parallel along the intake pipe 4B. And the front-end | tip part of the transmission pipe 11 is fixedly supported via the stay 20a, 20b with respect to the intake pipe 4B, and the opening end part 11a is opened toward the engine chamber 2 which is the exterior.

This embodiment configured as described above also has the same operations and effects as those of the first embodiment.
(Third embodiment)
Next, a second embodiment embodying the present invention will be described with reference to FIGS.

  As shown in FIGS. 6 and 7, a vibrating body 19 is integrally formed at the tip of the first portion 12. A ring-shaped first engaging portion 30 is integrally formed on the outer periphery of the distal end of the first portion 12.

  A ring-shaped second engagement portion 31 that can be engaged with the first engagement portion 30 is integrally formed at the proximal end of the second portion 13 so as to protrude. The second portion 13 is joined to the tip of the first portion 12 by the second engagement portion 31 engaging the first engagement portion 30.

This embodiment configured as described above also exhibits the same operation as that of the first embodiment.
This embodiment has the following effects in addition to the effects described in (1) of the first embodiment.
(4) Since the vibrating body 19 is integrally formed with the first portion 12, the number of parts is reduced. For this reason, the number of assembly steps is reduced and the manufacturing cost is reduced.

(Fourth embodiment)
Next, a second embodiment embodying the present invention will be described with reference to FIGS.

  As shown in FIGS. 8 and 9, a vibrating body 19 is integrally formed at the end of the second portion 13. The second portion 13 is joined to the first portion 12 by welding the second support portion 17 to the first support portion 15 of the first portion 12.

This embodiment configured as described above also exhibits the same operation as that of the first embodiment.
This embodiment has the same effect as the third embodiment.
(Other embodiments)
In addition, this embodiment can also be changed and embodied as follows.

In each embodiment, the first portion 12 of the transmission pipe 11 is separated from the intake pipe 4B and joined to the intake pipe 4B by fitting, for example.
In each embodiment, the second portion 13 of the transmission tube 11 is configured as a side branch in which the intake sound resonates. In this case, the intake sound transmission device 10 also functions as a silencer.

The top view which shows the intake sound control apparatus provided in the intake pipe of the vehicle. Sectional drawing which shows the intake sound transmission apparatus of 1st Embodiment. The disassembled perspective view which shows an intake sound transmission apparatus. Sectional drawing which shows the intake sound transmission apparatus of 2nd Embodiment. The disassembled perspective view which shows an intake sound transmission apparatus. Sectional drawing which shows the intake sound transmission apparatus of 3rd Embodiment. The disassembled perspective view which shows an intake sound transmission apparatus. Sectional drawing which shows the intake sound transmission apparatus of 4th Embodiment. The disassembled perspective view which shows an intake sound transmission apparatus. Sectional drawing which shows the conventional intake sound transmission apparatus.

Explanation of symbols

  2 ... Engine chamber as outside, 3 ... Engine, 4A, 4B ... Intake pipe, 7 ... Cabin as outside, 10 ... Intake sound transmission device, 11 ... Transmission pipe, 11a ... Open end, 12 ... First part , 13 ... 2nd part, 14 ... 1st bellows part, 16 ... 2nd bellows part, 19 ... Vibrating body.

Claims (3)

In a vehicle intake sound transmission device provided with a vibrating body that vibrates due to intake pulsation inside a transmission pipe branched from an intake pipe of an internal combustion engine,
The transmission pipe is divided into a first part on the intake pipe side and a second part connected to the tip of the first part and opening toward the outside,
The vibrating body is interposed between the first part and the second part, the first and second parts are closed by the vibrating body, and at least one peripheral wall of the first and second parts is bellows. An inspiratory sound transmission device for a vehicle, characterized in that it is formed by:   The vehicle intake sound transmission device according to claim 1, wherein the vibrating body is formed integrally with the first portion or the second portion.   2. The vehicle intake sound according to claim 1, wherein the vibrating body is separated from the first part and the second part, and is sandwiched between the first part and the second part. Transmission device.

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